drivers/scsi/cxgbi/libcxgbi.c

   1 /*
   2  * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver.
   3  *
   4  * Copyright (c) 2010 Chelsio Communications, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation.
   9  *
  10  * Written by: Karen Xie ([email protected])
  11  * Written by: Rakesh Ranjan ([email protected])
  12  */
  13
  14 #define pr_fmt(fmt)     KBUILD_MODNAME ":%s: " fmt, __func__
  15
  16 #include <linux/skbuff.h>
  17 #include <linux/crypto.h>
  18 #include <linux/scatterlist.h>
  19 #include <linux/pci.h>
  20 #include <scsi/scsi.h>
  21 #include <scsi/scsi_cmnd.h>
  22 #include <scsi/scsi_host.h>
  23 #include <linux/if_vlan.h>
  24 #include <linux/inet.h>
  25 #include <net/dst.h>
  26 #include <net/route.h>
  27 #include <net/ipv6.h>
  28 #include <net/ip6_route.h>
  29 #include <net/addrconf.h>
  30
  31 #include <linux/inetdevice.h>   /* ip_dev_find */
  32 #include <linux/module.h>
  33 #include <net/tcp.h>
  34
  35 static unsigned int dbg_level;
  36
  37 #include "libcxgbi.h"
  38
  39 #define DRV_MODULE_NAME         "libcxgbi"
  40 #define DRV_MODULE_DESC         "Chelsio iSCSI driver library"
  41 #define DRV_MODULE_VERSION      "0.9.0"
  42 #define DRV_MODULE_RELDATE      "Jun. 2010"
  43
  44 MODULE_AUTHOR("Chelsio Communications, Inc.");
  45 MODULE_DESCRIPTION(DRV_MODULE_DESC);
  46 MODULE_VERSION(DRV_MODULE_VERSION);
  47 MODULE_LICENSE("GPL");
  48
  49 module_param(dbg_level, uint, 0644);
  50 MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
  51
  52
  53 /*
  54  * cxgbi device management
  55  * maintains a list of the cxgbi devices
  56  */
  57 static LIST_HEAD(cdev_list);
  58 static DEFINE_MUTEX(cdev_mutex);
  59
  60 static LIST_HEAD(cdev_rcu_list);
  61 static DEFINE_SPINLOCK(cdev_rcu_lock);
  62
  63 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
  64                                 unsigned int max_conn)
  65 {
  66         struct cxgbi_ports_map *pmap = &cdev->pmap;
  67
  68         pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
  69                                              sizeof(struct cxgbi_sock *),
  70                                              GFP_KERNEL);
  71         if (!pmap->port_csk) {
  72                 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
  73                 return -ENOMEM;
  74         }
  75
  76         pmap->max_connect = max_conn;
  77         pmap->sport_base = base;
  78         spin_lock_init(&pmap->lock);
  79         return 0;
  80 }
  81 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
  82
  83 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
  84 {
  85         struct cxgbi_ports_map *pmap = &cdev->pmap;
  86         struct cxgbi_sock *csk;
  87         int i;
  88
  89         for (i = 0; i < pmap->max_connect; i++) {
  90                 if (pmap->port_csk[i]) {
  91                         csk = pmap->port_csk[i];
  92                         pmap->port_csk[i] = NULL;
  93                         log_debug(1 << CXGBI_DBG_SOCK,
  94                                 "csk 0x%p, cdev 0x%p, offload down.\n",
  95                                 csk, cdev);
  96                         spin_lock_bh(&csk->lock);
  97                         cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
  98                         cxgbi_sock_closed(csk);
  99                         spin_unlock_bh(&csk->lock);
 100                         cxgbi_sock_put(csk);
 101                 }
 102         }
 103 }
 104 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
 105
 106 static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
 107 {
 108         log_debug(1 << CXGBI_DBG_DEV,
 109                 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
 110         cxgbi_hbas_remove(cdev);
 111         cxgbi_device_portmap_cleanup(cdev);
 112         if (cdev->dev_ddp_cleanup)
 113                 cdev->dev_ddp_cleanup(cdev);
 114         else
 115                 cxgbi_ddp_cleanup(cdev);
 116         if (cdev->ddp)
 117                 cxgbi_ddp_cleanup(cdev);
 118         if (cdev->pmap.max_connect)
 119                 cxgbi_free_big_mem(cdev->pmap.port_csk);
 120         kfree(cdev);
 121 }
 122
 123 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
 124                                            unsigned int nports)
 125 {
 126         struct cxgbi_device *cdev;
 127
 128         cdev = kzalloc(sizeof(*cdev) + extra + nports *
 129                         (sizeof(struct cxgbi_hba *) +
 130                          sizeof(struct net_device *)),
 131                         GFP_KERNEL);
 132         if (!cdev) {
 133                 pr_warn("nport %d, OOM.\n", nports);
 134                 return NULL;
 135         }
 136         cdev->ports = (struct net_device **)(cdev + 1);
 137         cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
 138                                                 sizeof(struct net_device *));
 139         if (extra)
 140                 cdev->dd_data = ((char *)cdev->hbas) +
 141                                 nports * sizeof(struct cxgbi_hba *);
 142         spin_lock_init(&cdev->pmap.lock);
 143
 144         mutex_lock(&cdev_mutex);
 145         list_add_tail(&cdev->list_head, &cdev_list);
 146         mutex_unlock(&cdev_mutex);
 147
 148         spin_lock(&cdev_rcu_lock);
 149         list_add_tail_rcu(&cdev->rcu_node, &cdev_rcu_list);
 150         spin_unlock(&cdev_rcu_lock);
 151
 152         log_debug(1 << CXGBI_DBG_DEV,
 153                 "cdev 0x%p, p# %u.\n", cdev, nports);
 154         return cdev;
 155 }
 156 EXPORT_SYMBOL_GPL(cxgbi_device_register);
 157
 158 void cxgbi_device_unregister(struct cxgbi_device *cdev)
 159 {
 160         log_debug(1 << CXGBI_DBG_DEV,
 161                 "cdev 0x%p, p# %u,%s.\n",
 162                 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
 163
 164         mutex_lock(&cdev_mutex);
 165         list_del(&cdev->list_head);
 166         mutex_unlock(&cdev_mutex);
 167
 168         spin_lock(&cdev_rcu_lock);
 169         list_del_rcu(&cdev->rcu_node);
 170         spin_unlock(&cdev_rcu_lock);
 171         synchronize_rcu();
 172
 173         cxgbi_device_destroy(cdev);
 174 }
 175 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
 176
 177 void cxgbi_device_unregister_all(unsigned int flag)
 178 {
 179         struct cxgbi_device *cdev, *tmp;
 180
 181         mutex_lock(&cdev_mutex);
 182         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 183                 if ((cdev->flags & flag) == flag) {
 184                         mutex_unlock(&cdev_mutex);
 185                         cxgbi_device_unregister(cdev);
 186                         mutex_lock(&cdev_mutex);
 187                 }
 188         }
 189         mutex_unlock(&cdev_mutex);
 190 }
 191 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
 192
 193 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
 194 {
 195         struct cxgbi_device *cdev, *tmp;
 196
 197         mutex_lock(&cdev_mutex);
 198         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 199                 if (cdev->lldev == lldev) {
 200                         mutex_unlock(&cdev_mutex);
 201                         return cdev;
 202                 }
 203         }
 204         mutex_unlock(&cdev_mutex);
 205
 206         log_debug(1 << CXGBI_DBG_DEV,
 207                 "lldev 0x%p, NO match found.\n", lldev);
 208         return NULL;
 209 }
 210 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
 211
 212 struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
 213                                                  int *port)
 214 {
 215         struct net_device *vdev = NULL;
 216         struct cxgbi_device *cdev, *tmp;
 217         int i;
 218
 219         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 220                 vdev = ndev;
 221                 ndev = vlan_dev_real_dev(ndev);
 222                 log_debug(1 << CXGBI_DBG_DEV,
 223                         "vlan dev %s -> %s.\n", vdev->name, ndev->name);
 224         }
 225
 226         mutex_lock(&cdev_mutex);
 227         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 228                 for (i = 0; i < cdev->nports; i++) {
 229                         if (ndev == cdev->ports[i]) {
 230                                 cdev->hbas[i]->vdev = vdev;
 231                                 mutex_unlock(&cdev_mutex);
 232                                 if (port)
 233                                         *port = i;
 234                                 return cdev;
 235                         }
 236                 }
 237         }
 238         mutex_unlock(&cdev_mutex);
 239         log_debug(1 << CXGBI_DBG_DEV,
 240                 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 241         return NULL;
 242 }
 243 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
 244
 245 struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *ndev,
 246                                                      int *port)
 247 {
 248         struct net_device *vdev = NULL;
 249         struct cxgbi_device *cdev;
 250         int i;
 251
 252         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 253                 vdev = ndev;
 254                 ndev = vlan_dev_real_dev(ndev);
 255                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 256         }
 257
 258         rcu_read_lock();
 259         list_for_each_entry_rcu(cdev, &cdev_rcu_list, rcu_node) {
 260                 for (i = 0; i < cdev->nports; i++) {
 261                         if (ndev == cdev->ports[i]) {
 262                                 cdev->hbas[i]->vdev = vdev;
 263                                 rcu_read_unlock();
 264                                 if (port)
 265                                         *port = i;
 266                                 return cdev;
 267                         }
 268                 }
 269         }
 270         rcu_read_unlock();
 271
 272         log_debug(1 << CXGBI_DBG_DEV,
 273                   "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 274         return NULL;
 275 }
 276 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev_rcu);
 277
 278 static struct cxgbi_device *cxgbi_device_find_by_mac(struct net_device *ndev,
 279                                                      int *port)
 280 {
 281         struct net_device *vdev = NULL;
 282         struct cxgbi_device *cdev, *tmp;
 283         int i;
 284
 285         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 286                 vdev = ndev;
 287                 ndev = vlan_dev_real_dev(ndev);
 288                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 289         }
 290
 291         mutex_lock(&cdev_mutex);
 292         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 293                 for (i = 0; i < cdev->nports; i++) {
 294                         if (!memcmp(ndev->dev_addr, cdev->ports[i]->dev_addr,
 295                                     MAX_ADDR_LEN)) {
 296                                 cdev->hbas[i]->vdev = vdev;
 297                                 mutex_unlock(&cdev_mutex);
 298                                 if (port)
 299                                         *port = i;
 300                                 return cdev;
 301                         }
 302                 }
 303         }
 304         mutex_unlock(&cdev_mutex);
 305         log_debug(1 << CXGBI_DBG_DEV,
 306                   "ndev 0x%p, %s, NO match mac found.\n",
 307                   ndev, ndev->name);
 308         return NULL;
 309 }
 310
 311 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
 312 {
 313         int i;
 314         struct cxgbi_hba *chba;
 315
 316         log_debug(1 << CXGBI_DBG_DEV,
 317                 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 318
 319         for (i = 0; i < cdev->nports; i++) {
 320                 chba = cdev->hbas[i];
 321                 if (chba) {
 322                         cdev->hbas[i] = NULL;
 323                         iscsi_host_remove(chba->shost);
 324                         pci_dev_put(cdev->pdev);
 325                         iscsi_host_free(chba->shost);
 326                 }
 327         }
 328 }
 329 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
 330
 331 int cxgbi_hbas_add(struct cxgbi_device *cdev, u64 max_lun,
 332                 unsigned int max_id, struct scsi_host_template *sht,
 333                 struct scsi_transport_template *stt)
 334 {
 335         struct cxgbi_hba *chba;
 336         struct Scsi_Host *shost;
 337         int i, err;
 338
 339         log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 340
 341         for (i = 0; i < cdev->nports; i++) {
 342                 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
 343                 if (!shost) {
 344                         pr_info("0x%p, p%d, %s, host alloc failed.\n",
 345                                 cdev, i, cdev->ports[i]->name);
 346                         err = -ENOMEM;
 347                         goto err_out;
 348                 }
 349
 350                 shost->transportt = stt;
 351                 shost->max_lun = max_lun;
 352                 shost->max_id = max_id;
 353                 shost->max_channel = 0;
 354                 shost->max_cmd_len = 16;
 355
 356                 chba = iscsi_host_priv(shost);
 357                 chba->cdev = cdev;
 358                 chba->ndev = cdev->ports[i];
 359                 chba->shost = shost;
 360
 361                 log_debug(1 << CXGBI_DBG_DEV,
 362                         "cdev 0x%p, p#%d %s: chba 0x%p.\n",
 363                         cdev, i, cdev->ports[i]->name, chba);
 364
 365                 pci_dev_get(cdev->pdev);
 366                 err = iscsi_host_add(shost, &cdev->pdev->dev);
 367                 if (err) {
 368                         pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
 369                                 cdev, i, cdev->ports[i]->name);
 370                         pci_dev_put(cdev->pdev);
 371                         scsi_host_put(shost);
 372                         goto  err_out;
 373                 }
 374
 375                 cdev->hbas[i] = chba;
 376         }
 377
 378         return 0;
 379
 380 err_out:
 381         cxgbi_hbas_remove(cdev);
 382         return err;
 383 }
 384 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
 385
 386 /*
 387  * iSCSI offload
 388  *
 389  * - source port management
 390  *   To find a free source port in the port allocation map we use a very simple
 391  *   rotor scheme to look for the next free port.
 392  *
 393  *   If a source port has been specified make sure that it doesn't collide with
 394  *   our normal source port allocation map.  If it's outside the range of our
 395  *   allocation/deallocation scheme just let them use it.
 396  *
 397  *   If the source port is outside our allocation range, the caller is
 398  *   responsible for keeping track of their port usage.
 399  */
 400 static int sock_get_port(struct cxgbi_sock *csk)
 401 {
 402         struct cxgbi_device *cdev = csk->cdev;
 403         struct cxgbi_ports_map *pmap = &cdev->pmap;
 404         unsigned int start;
 405         int idx;
 406         __be16 *port;
 407
 408         if (!pmap->max_connect) {
 409                 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
 410                            cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 411                 return -EADDRNOTAVAIL;
 412         }
 413
 414         if (csk->csk_family == AF_INET)
 415                 port = &csk->saddr.sin_port;
 416         else /* ipv6 */
 417                 port = &csk->saddr6.sin6_port;
 418
 419         if (*port) {
 420                 pr_err("source port NON-ZERO %u.\n",
 421                         ntohs(*port));
 422                 return -EADDRINUSE;
 423         }
 424
 425         spin_lock_bh(&pmap->lock);
 426         if (pmap->used >= pmap->max_connect) {
 427                 spin_unlock_bh(&pmap->lock);
 428                 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
 429                         cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 430                 return -EADDRNOTAVAIL;
 431         }
 432
 433         start = idx = pmap->next;
 434         do {
 435                 if (++idx >= pmap->max_connect)
 436                         idx = 0;
 437                 if (!pmap->port_csk[idx]) {
 438                         pmap->used++;
 439                         *port = htons(pmap->sport_base + idx);
 440                         pmap->next = idx;
 441                         pmap->port_csk[idx] = csk;
 442                         spin_unlock_bh(&pmap->lock);
 443                         cxgbi_sock_get(csk);
 444                         log_debug(1 << CXGBI_DBG_SOCK,
 445                                 "cdev 0x%p, p#%u %s, p %u, %u.\n",
 446                                 cdev, csk->port_id,
 447                                 cdev->ports[csk->port_id]->name,
 448                                 pmap->sport_base + idx, pmap->next);
 449                         return 0;
 450                 }
 451         } while (idx != start);
 452         spin_unlock_bh(&pmap->lock);
 453
 454         /* should not happen */
 455         pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
 456                 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 457                 pmap->next);
 458         return -EADDRNOTAVAIL;
 459 }
 460
 461 static void sock_put_port(struct cxgbi_sock *csk)
 462 {
 463         struct cxgbi_device *cdev = csk->cdev;
 464         struct cxgbi_ports_map *pmap = &cdev->pmap;
 465         __be16 *port;
 466
 467         if (csk->csk_family == AF_INET)
 468                 port = &csk->saddr.sin_port;
 469         else /* ipv6 */
 470                 port = &csk->saddr6.sin6_port;
 471
 472         if (*port) {
 473                 int idx = ntohs(*port) - pmap->sport_base;
 474
 475                 *port = 0;
 476                 if (idx < 0 || idx >= pmap->max_connect) {
 477                         pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
 478                                 cdev, csk->port_id,
 479                                 cdev->ports[csk->port_id]->name,
 480                                 ntohs(*port));
 481                         return;
 482                 }
 483
 484                 spin_lock_bh(&pmap->lock);
 485                 pmap->port_csk[idx] = NULL;
 486                 pmap->used--;
 487                 spin_unlock_bh(&pmap->lock);
 488
 489                 log_debug(1 << CXGBI_DBG_SOCK,
 490                         "cdev 0x%p, p#%u %s, release %u.\n",
 491                         cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 492                         pmap->sport_base + idx);
 493
 494                 cxgbi_sock_put(csk);
 495         }
 496 }
 497
 498 /*
 499  * iscsi tcp connection
 500  */
 501 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
 502 {
 503         if (csk->cpl_close) {
 504                 kfree_skb(csk->cpl_close);
 505                 csk->cpl_close = NULL;
 506         }
 507         if (csk->cpl_abort_req) {
 508                 kfree_skb(csk->cpl_abort_req);
 509                 csk->cpl_abort_req = NULL;
 510         }
 511         if (csk->cpl_abort_rpl) {
 512                 kfree_skb(csk->cpl_abort_rpl);
 513                 csk->cpl_abort_rpl = NULL;
 514         }
 515 }
 516 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
 517
 518 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
 519 {
 520         struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
 521
 522         if (!csk) {
 523                 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
 524                 return NULL;
 525         }
 526
 527         if (cdev->csk_alloc_cpls(csk) < 0) {
 528                 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
 529                 kfree(csk);
 530                 return NULL;
 531         }
 532
 533         spin_lock_init(&csk->lock);
 534         kref_init(&csk->refcnt);
 535         skb_queue_head_init(&csk->receive_queue);
 536         skb_queue_head_init(&csk->write_queue);
 537         setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
 538         rwlock_init(&csk->callback_lock);
 539         csk->cdev = cdev;
 540         csk->flags = 0;
 541         cxgbi_sock_set_state(csk, CTP_CLOSED);
 542
 543         log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
 544
 545         return csk;
 546 }
 547
 548 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
 549                                       __be32 saddr, __be32 daddr,
 550                                       __be16 sport, __be16 dport, u8 tos)
 551 {
 552         struct rtable *rt;
 553
 554         rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
 555                                    dport, sport, IPPROTO_TCP, tos, 0);
 556         if (IS_ERR(rt))
 557                 return NULL;
 558
 559         return rt;
 560 }
 561
 562 static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
 563 {
 564         struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
 565         struct dst_entry *dst;
 566         struct net_device *ndev;
 567         struct cxgbi_device *cdev;
 568         struct rtable *rt = NULL;
 569         struct neighbour *n;
 570         struct flowi4 fl4;
 571         struct cxgbi_sock *csk = NULL;
 572         unsigned int mtu = 0;
 573         int port = 0xFFFF;
 574         int err = 0;
 575
 576         rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
 577         if (!rt) {
 578                 pr_info("no route to ipv4 0x%x, port %u.\n",
 579                         be32_to_cpu(daddr->sin_addr.s_addr),
 580                         be16_to_cpu(daddr->sin_port));
 581                 err = -ENETUNREACH;
 582                 goto err_out;
 583         }
 584         dst = &rt->dst;
 585         n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
 586         if (!n) {
 587                 err = -ENODEV;
 588                 goto rel_rt;
 589         }
 590         ndev = n->dev;
 591
 592         if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
 593                 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
 594                         &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 595                         ndev->name);
 596                 err = -ENETUNREACH;
 597                 goto rel_neigh;
 598         }
 599
 600         if (ndev->flags & IFF_LOOPBACK) {
 601                 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
 602                 mtu = ndev->mtu;
 603                 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
 604                         n->dev->name, ndev->name, mtu);
 605         }
 606
 607         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 608         if (!cdev) {
 609                 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
 610                         &daddr->sin_addr.s_addr, ndev->name);
 611                 err = -ENETUNREACH;
 612                 goto rel_neigh;
 613         }
 614         log_debug(1 << CXGBI_DBG_SOCK,
 615                 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 616                 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 617                            port, ndev->name, cdev);
 618
 619         csk = cxgbi_sock_create(cdev);
 620         if (!csk) {
 621                 err = -ENOMEM;
 622                 goto rel_neigh;
 623         }
 624         csk->cdev = cdev;
 625         csk->port_id = port;
 626         csk->mtu = mtu;
 627         csk->dst = dst;
 628
 629         csk->csk_family = AF_INET;
 630         csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
 631         csk->daddr.sin_port = daddr->sin_port;
 632         csk->daddr.sin_family = daddr->sin_family;
 633         csk->saddr.sin_family = daddr->sin_family;
 634         csk->saddr.sin_addr.s_addr = fl4.saddr;
 635         neigh_release(n);
 636
 637         return csk;
 638
 639 rel_neigh:
 640         neigh_release(n);
 641
 642 rel_rt:
 643         ip_rt_put(rt);
 644         if (csk)
 645                 cxgbi_sock_closed(csk);
 646 err_out:
 647         return ERR_PTR(err);
 648 }
 649
 650 #if IS_ENABLED(CONFIG_IPV6)
 651 static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
 652                                         const struct in6_addr *daddr)
 653 {
 654         struct flowi6 fl;
 655
 656         if (saddr)
 657                 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
 658         if (daddr)
 659                 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
 660         return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
 661 }
 662
 663 static struct cxgbi_sock *cxgbi_check_route6(struct sockaddr *dst_addr)
 664 {
 665         struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
 666         struct dst_entry *dst;
 667         struct net_device *ndev;
 668         struct cxgbi_device *cdev;
 669         struct rt6_info *rt = NULL;
 670         struct neighbour *n;
 671         struct in6_addr pref_saddr;
 672         struct cxgbi_sock *csk = NULL;
 673         unsigned int mtu = 0;
 674         int port = 0xFFFF;
 675         int err = 0;
 676
 677         rt = find_route_ipv6(NULL, &daddr6->sin6_addr);
 678
 679         if (!rt) {
 680                 pr_info("no route to ipv6 %pI6 port %u\n",
 681                         daddr6->sin6_addr.s6_addr,
 682                         be16_to_cpu(daddr6->sin6_port));
 683                 err = -ENETUNREACH;
 684                 goto err_out;
 685         }
 686
 687         dst = &rt->dst;
 688
 689         n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
 690
 691         if (!n) {
 692                 pr_info("%pI6, port %u, dst no neighbour.\n",
 693                         daddr6->sin6_addr.s6_addr,
 694                         be16_to_cpu(daddr6->sin6_port));
 695                 err = -ENETUNREACH;
 696                 goto rel_rt;
 697         }
 698         ndev = n->dev;
 699
 700         if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
 701                 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
 702                         daddr6->sin6_addr.s6_addr,
 703                         ntohs(daddr6->sin6_port), ndev->name);
 704                 err = -ENETUNREACH;
 705                 goto rel_rt;
 706         }
 707
 708         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 709         if (!cdev)
 710                 cdev = cxgbi_device_find_by_mac(ndev, &port);
 711         if (!cdev) {
 712                 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
 713                         daddr6->sin6_addr.s6_addr, ndev->name);
 714                 err = -ENETUNREACH;
 715                 goto rel_rt;
 716         }
 717         log_debug(1 << CXGBI_DBG_SOCK,
 718                   "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 719                   daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
 720                   ndev->name, cdev);
 721
 722         csk = cxgbi_sock_create(cdev);
 723         if (!csk) {
 724                 err = -ENOMEM;
 725                 goto rel_rt;
 726         }
 727         csk->cdev = cdev;
 728         csk->port_id = port;
 729         csk->mtu = mtu;
 730         csk->dst = dst;
 731
 732         if (ipv6_addr_any(&rt->rt6i_prefsrc.addr)) {
 733                 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
 734
 735                 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
 736                                          &daddr6->sin6_addr, 0, &pref_saddr);
 737                 if (err) {
 738                         pr_info("failed to get source address to reach %pI6\n",
 739                                 &daddr6->sin6_addr);
 740                         goto rel_rt;
 741                 }
 742         } else {
 743                 pref_saddr = rt->rt6i_prefsrc.addr;
 744         }
 745
 746         csk->csk_family = AF_INET6;
 747         csk->daddr6.sin6_addr = daddr6->sin6_addr;
 748         csk->daddr6.sin6_port = daddr6->sin6_port;
 749         csk->daddr6.sin6_family = daddr6->sin6_family;
 750         csk->saddr6.sin6_addr = pref_saddr;
 751
 752         neigh_release(n);
 753         return csk;
 754
 755 rel_rt:
 756         if (n)
 757                 neigh_release(n);
 758
 759         ip6_rt_put(rt);
 760         if (csk)
 761                 cxgbi_sock_closed(csk);
 762 err_out:
 763         return ERR_PTR(err);
 764 }
 765 #endif /* IS_ENABLED(CONFIG_IPV6) */
 766
 767 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
 768                         unsigned int opt)
 769 {
 770         csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
 771         dst_confirm(csk->dst);
 772         smp_mb();
 773         cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
 774 }
 775 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
 776
 777 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
 778 {
 779         log_debug(1 << CXGBI_DBG_SOCK,
 780                 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
 781                 csk, csk->state, csk->flags, csk->user_data);
 782
 783         if (csk->state != CTP_ESTABLISHED) {
 784                 read_lock_bh(&csk->callback_lock);
 785                 if (csk->user_data)
 786                         iscsi_conn_failure(csk->user_data,
 787                                         ISCSI_ERR_CONN_FAILED);
 788                 read_unlock_bh(&csk->callback_lock);
 789         }
 790 }
 791
 792 void cxgbi_sock_closed(struct cxgbi_sock *csk)
 793 {
 794         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 795                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 796         cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 797         if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
 798                 return;
 799         if (csk->saddr.sin_port)
 800                 sock_put_port(csk);
 801         if (csk->dst)
 802                 dst_release(csk->dst);
 803         csk->cdev->csk_release_offload_resources(csk);
 804         cxgbi_sock_set_state(csk, CTP_CLOSED);
 805         cxgbi_inform_iscsi_conn_closing(csk);
 806         cxgbi_sock_put(csk);
 807 }
 808 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
 809
 810 static void need_active_close(struct cxgbi_sock *csk)
 811 {
 812         int data_lost;
 813         int close_req = 0;
 814
 815         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 816                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 817         spin_lock_bh(&csk->lock);
 818         dst_confirm(csk->dst);
 819         data_lost = skb_queue_len(&csk->receive_queue);
 820         __skb_queue_purge(&csk->receive_queue);
 821
 822         if (csk->state == CTP_ACTIVE_OPEN)
 823                 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 824         else if (csk->state == CTP_ESTABLISHED) {
 825                 close_req = 1;
 826                 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
 827         } else if (csk->state == CTP_PASSIVE_CLOSE) {
 828                 close_req = 1;
 829                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 830         }
 831
 832         if (close_req) {
 833                 if (data_lost)
 834                         csk->cdev->csk_send_abort_req(csk);
 835                 else
 836                         csk->cdev->csk_send_close_req(csk);
 837         }
 838
 839         spin_unlock_bh(&csk->lock);
 840 }
 841
 842 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
 843 {
 844         pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
 845                         csk, csk->state, csk->flags,
 846                         &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
 847                         &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
 848                         errno);
 849
 850         cxgbi_sock_set_state(csk, CTP_CONNECTING);
 851         csk->err = errno;
 852         cxgbi_sock_closed(csk);
 853 }
 854 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
 855
 856 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
 857 {
 858         struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
 859
 860         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 861                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 862         cxgbi_sock_get(csk);
 863         spin_lock_bh(&csk->lock);
 864         if (csk->state == CTP_ACTIVE_OPEN)
 865                 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
 866         spin_unlock_bh(&csk->lock);
 867         cxgbi_sock_put(csk);
 868         __kfree_skb(skb);
 869 }
 870 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
 871
 872 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
 873 {
 874         cxgbi_sock_get(csk);
 875         spin_lock_bh(&csk->lock);
 876         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 877                 if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_RCVD))
 878                         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
 879                 else {
 880                         cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_RCVD);
 881                         cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
 882                         if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
 883                                 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
 884                                         csk, csk->state, csk->flags, csk->tid);
 885                         cxgbi_sock_closed(csk);
 886                 }
 887         }
 888         spin_unlock_bh(&csk->lock);
 889         cxgbi_sock_put(csk);
 890 }
 891 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
 892
 893 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
 894 {
 895         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 896                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 897         cxgbi_sock_get(csk);
 898         spin_lock_bh(&csk->lock);
 899
 900         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 901                 goto done;
 902
 903         switch (csk->state) {
 904         case CTP_ESTABLISHED:
 905                 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
 906                 break;
 907         case CTP_ACTIVE_CLOSE:
 908                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 909                 break;
 910         case CTP_CLOSE_WAIT_1:
 911                 cxgbi_sock_closed(csk);
 912                 break;
 913         case CTP_ABORTING:
 914                 break;
 915         default:
 916                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 917                         csk, csk->state, csk->flags, csk->tid);
 918         }
 919         cxgbi_inform_iscsi_conn_closing(csk);
 920 done:
 921         spin_unlock_bh(&csk->lock);
 922         cxgbi_sock_put(csk);
 923 }
 924 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
 925
 926 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
 927 {
 928         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 929                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 930         cxgbi_sock_get(csk);
 931         spin_lock_bh(&csk->lock);
 932
 933         csk->snd_una = snd_nxt - 1;
 934         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 935                 goto done;
 936
 937         switch (csk->state) {
 938         case CTP_ACTIVE_CLOSE:
 939                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
 940                 break;
 941         case CTP_CLOSE_WAIT_1:
 942         case CTP_CLOSE_WAIT_2:
 943                 cxgbi_sock_closed(csk);
 944                 break;
 945         case CTP_ABORTING:
 946                 break;
 947         default:
 948                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 949                         csk, csk->state, csk->flags, csk->tid);
 950         }
 951 done:
 952         spin_unlock_bh(&csk->lock);
 953         cxgbi_sock_put(csk);
 954 }
 955 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
 956
 957 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
 958                            unsigned int snd_una, int seq_chk)
 959 {
 960         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 961                         "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
 962                         csk, csk->state, csk->flags, csk->tid, credits,
 963                         csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
 964
 965         spin_lock_bh(&csk->lock);
 966
 967         csk->wr_cred += credits;
 968         if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
 969                 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
 970
 971         while (credits) {
 972                 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
 973
 974                 if (unlikely(!p)) {
 975                         pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
 976                                 csk, csk->state, csk->flags, csk->tid, credits,
 977                                 csk->wr_cred, csk->wr_una_cred);
 978                         break;
 979                 }
 980
 981                 if (unlikely(credits < p->csum)) {
 982                         pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
 983                                 csk, csk->state, csk->flags, csk->tid,
 984                                 credits, csk->wr_cred, csk->wr_una_cred,
 985                                 p->csum);
 986                         p->csum -= credits;
 987                         break;
 988                 } else {
 989                         cxgbi_sock_dequeue_wr(csk);
 990                         credits -= p->csum;
 991                         kfree_skb(p);
 992                 }
 993         }
 994
 995         cxgbi_sock_check_wr_invariants(csk);
 996
 997         if (seq_chk) {
 998                 if (unlikely(before(snd_una, csk->snd_una))) {
 999                         pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1000                                 csk, csk->state, csk->flags, csk->tid, snd_una,
1001                                 csk->snd_una);
1002                         goto done;
1003                 }
1004
1005                 if (csk->snd_una != snd_una) {
1006                         csk->snd_una = snd_una;
1007                         dst_confirm(csk->dst);
1008                 }
1009         }
1010
1011         if (skb_queue_len(&csk->write_queue)) {
1012                 if (csk->cdev->csk_push_tx_frames(csk, 0))
1013                         cxgbi_conn_tx_open(csk);
1014         } else
1015                 cxgbi_conn_tx_open(csk);
1016 done:
1017         spin_unlock_bh(&csk->lock);
1018 }
1019 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1020
1021 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1022                                              unsigned short mtu)
1023 {
1024         int i = 0;
1025
1026         while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1027                 ++i;
1028
1029         return i;
1030 }
1031
1032 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1033 {
1034         unsigned int idx;
1035         struct dst_entry *dst = csk->dst;
1036
1037         csk->advmss = dst_metric_advmss(dst);
1038
1039         if (csk->advmss > pmtu - 40)
1040                 csk->advmss = pmtu - 40;
1041         if (csk->advmss < csk->cdev->mtus[0] - 40)
1042                 csk->advmss = csk->cdev->mtus[0] - 40;
1043         idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1044
1045         return idx;
1046 }
1047 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1048
1049 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1050 {
1051         cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1052         __skb_queue_tail(&csk->write_queue, skb);
1053 }
1054 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1055
1056 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1057 {
1058         struct sk_buff *skb;
1059
1060         while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1061                 kfree_skb(skb);
1062 }
1063 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1064
1065 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1066 {
1067         int pending = cxgbi_sock_count_pending_wrs(csk);
1068
1069         if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1070                 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1071                         csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1072 }
1073 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1074
1075 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1076 {
1077         struct cxgbi_device *cdev = csk->cdev;
1078         struct sk_buff *next;
1079         int err, copied = 0;
1080
1081         spin_lock_bh(&csk->lock);
1082
1083         if (csk->state != CTP_ESTABLISHED) {
1084                 log_debug(1 << CXGBI_DBG_PDU_TX,
1085                         "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1086                         csk, csk->state, csk->flags, csk->tid);
1087                 err = -EAGAIN;
1088                 goto out_err;
1089         }
1090
1091         if (csk->err) {
1092                 log_debug(1 << CXGBI_DBG_PDU_TX,
1093                         "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1094                         csk, csk->state, csk->flags, csk->tid, csk->err);
1095                 err = -EPIPE;
1096                 goto out_err;
1097         }
1098
1099         if (csk->write_seq - csk->snd_una >= cdev->snd_win) {
1100                 log_debug(1 << CXGBI_DBG_PDU_TX,
1101                         "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1102                         csk, csk->state, csk->flags, csk->tid, csk->write_seq,
1103                         csk->snd_una, cdev->snd_win);
1104                 err = -ENOBUFS;
1105                 goto out_err;
1106         }
1107
1108         while (skb) {
1109                 int frags = skb_shinfo(skb)->nr_frags +
1110                                 (skb->len != skb->data_len);
1111
1112                 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1113                         pr_err("csk 0x%p, skb head %u < %u.\n",
1114                                 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1115                         err = -EINVAL;
1116                         goto out_err;
1117                 }
1118
1119                 if (frags >= SKB_WR_LIST_SIZE) {
1120                         pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1121                                 csk, skb_shinfo(skb)->nr_frags, skb->len,
1122                                 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1123                         err = -EINVAL;
1124                         goto out_err;
1125                 }
1126
1127                 next = skb->next;
1128                 skb->next = NULL;
1129                 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1130                 cxgbi_sock_skb_entail(csk, skb);
1131                 copied += skb->len;
1132                 csk->write_seq += skb->len +
1133                                 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1134                 skb = next;
1135         }
1136 done:
1137         if (likely(skb_queue_len(&csk->write_queue)))
1138                 cdev->csk_push_tx_frames(csk, 1);
1139         spin_unlock_bh(&csk->lock);
1140         return copied;
1141
1142 out_err:
1143         if (copied == 0 && err == -EPIPE)
1144                 copied = csk->err ? csk->err : -EPIPE;
1145         else
1146                 copied = err;
1147         goto done;
1148 }
1149
1150 /*
1151  * Direct Data Placement -
1152  * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted
1153  * final destination host-memory buffers based on the Initiator Task Tag (ITT)
1154  * in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
1155  * The host memory address is programmed into h/w in the format of pagepod
1156  * entries.
1157  * The location of the pagepod entry is encoded into ddp tag which is used as
1158  * the base for ITT/TTT.
1159  */
1160
1161 static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
1162 static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
1163 static unsigned char page_idx = DDP_PGIDX_MAX;
1164
1165 static unsigned char sw_tag_idx_bits;
1166 static unsigned char sw_tag_age_bits;
1167
1168 /*
1169  * Direct-Data Placement page size adjustment
1170  */
1171 static int ddp_adjust_page_table(void)
1172 {
1173         int i;
1174         unsigned int base_order, order;
1175
1176         if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
1177                 pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n",
1178                         PAGE_SIZE, 1UL << ddp_page_shift[0]);
1179                 return -EINVAL;
1180         }
1181
1182         base_order = get_order(1UL << ddp_page_shift[0]);
1183         order = get_order(1UL << PAGE_SHIFT);
1184
1185         for (i = 0; i < DDP_PGIDX_MAX; i++) {
1186                 /* first is the kernel page size, then just doubling */
1187                 ddp_page_order[i] = order - base_order + i;
1188                 ddp_page_shift[i] = PAGE_SHIFT + i;
1189         }
1190         return 0;
1191 }
1192
1193 static int ddp_find_page_index(unsigned long pgsz)
1194 {
1195         int i;
1196
1197         for (i = 0; i < DDP_PGIDX_MAX; i++) {
1198                 if (pgsz == (1UL << ddp_page_shift[i]))
1199                         return i;
1200         }
1201         pr_info("ddp page size %lu not supported.\n", pgsz);
1202         return DDP_PGIDX_MAX;
1203 }
1204
1205 static void ddp_setup_host_page_size(void)
1206 {
1207         if (page_idx == DDP_PGIDX_MAX) {
1208                 page_idx = ddp_find_page_index(PAGE_SIZE);
1209
1210                 if (page_idx == DDP_PGIDX_MAX) {
1211                         pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE);
1212                         if (ddp_adjust_page_table() < 0) {
1213                                 pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE);
1214                                 return;
1215                         }
1216                         page_idx = ddp_find_page_index(PAGE_SIZE);
1217                 }
1218                 pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx);
1219         }
1220 }
1221
1222 void cxgbi_ddp_page_size_factor(int *pgsz_factor)
1223 {
1224         int i;
1225
1226         for (i = 0; i < DDP_PGIDX_MAX; i++)
1227                 pgsz_factor[i] = ddp_page_order[i];
1228 }
1229 EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor);
1230
1231 /*
1232  * DDP setup & teardown
1233  */
1234
1235 void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod,
1236                         struct cxgbi_pagepod_hdr *hdr,
1237                         struct cxgbi_gather_list *gl, unsigned int gidx)
1238 {
1239         int i;
1240
1241         memcpy(ppod, hdr, sizeof(*hdr));
1242         for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) {
1243                 ppod->addr[i] = gidx < gl->nelem ?
1244                                 cpu_to_be64(gl->phys_addr[gidx]) : 0ULL;
1245         }
1246 }
1247 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set);
1248
1249 void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod)
1250 {
1251         memset(ppod, 0, sizeof(*ppod));
1252 }
1253 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear);
1254
1255 static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp,
1256                                         unsigned int start, unsigned int max,
1257                                         unsigned int count,
1258                                         struct cxgbi_gather_list *gl)
1259 {
1260         unsigned int i, j, k;
1261
1262         /*  not enough entries */
1263         if ((max - start) < count) {
1264                 log_debug(1 << CXGBI_DBG_DDP,
1265                         "NOT enough entries %u+%u < %u.\n", start, count, max);
1266                 return -EBUSY;
1267         }
1268
1269         max -= count;
1270         spin_lock(&ddp->map_lock);
1271         for (i = start; i < max;) {
1272                 for (j = 0, k = i; j < count; j++, k++) {
1273                         if (ddp->gl_map[k])
1274                                 break;
1275                 }
1276                 if (j == count) {
1277                         for (j = 0, k = i; j < count; j++, k++)
1278                                 ddp->gl_map[k] = gl;
1279                         spin_unlock(&ddp->map_lock);
1280                         return i;
1281                 }
1282                 i += j + 1;
1283         }
1284         spin_unlock(&ddp->map_lock);
1285         log_debug(1 << CXGBI_DBG_DDP,
1286                 "NO suitable entries %u available.\n", count);
1287         return -EBUSY;
1288 }
1289
1290 static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp,
1291                                                 int start, int count)
1292 {
1293         spin_lock(&ddp->map_lock);
1294         memset(&ddp->gl_map[start], 0,
1295                 count * sizeof(struct cxgbi_gather_list *));
1296         spin_unlock(&ddp->map_lock);
1297 }
1298
1299 static inline void ddp_gl_unmap(struct pci_dev *pdev,
1300                                         struct cxgbi_gather_list *gl)
1301 {
1302         int i;
1303
1304         for (i = 0; i < gl->nelem; i++)
1305                 dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE,
1306                                 PCI_DMA_FROMDEVICE);
1307 }
1308
1309 static inline int ddp_gl_map(struct pci_dev *pdev,
1310                                     struct cxgbi_gather_list *gl)
1311 {
1312         int i;
1313
1314         for (i = 0; i < gl->nelem; i++) {
1315                 gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0,
1316                                                 PAGE_SIZE,
1317                                                 PCI_DMA_FROMDEVICE);
1318                 if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) {
1319                         log_debug(1 << CXGBI_DBG_DDP,
1320                                 "page %d 0x%p, 0x%p dma mapping err.\n",
1321                                 i, gl->pages[i], pdev);
1322                         goto unmap;
1323                 }
1324         }
1325         return i;
1326 unmap:
1327         if (i) {
1328                 unsigned int nelem = gl->nelem;
1329
1330                 gl->nelem = i;
1331                 ddp_gl_unmap(pdev, gl);
1332                 gl->nelem = nelem;
1333         }
1334         return -EINVAL;
1335 }
1336
1337 static void ddp_release_gl(struct cxgbi_gather_list *gl,
1338                                   struct pci_dev *pdev)
1339 {
1340         ddp_gl_unmap(pdev, gl);
1341         kfree(gl);
1342 }
1343
1344 static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen,
1345                                                     struct scatterlist *sgl,
1346                                                     unsigned int sgcnt,
1347                                                     struct pci_dev *pdev,
1348                                                     gfp_t gfp)
1349 {
1350         struct cxgbi_gather_list *gl;
1351         struct scatterlist *sg = sgl;
1352         struct page *sgpage = sg_page(sg);
1353         unsigned int sglen = sg->length;
1354         unsigned int sgoffset = sg->offset;
1355         unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
1356                                 PAGE_SHIFT;
1357         int i = 1, j = 0;
1358
1359         if (xferlen < DDP_THRESHOLD) {
1360                 log_debug(1 << CXGBI_DBG_DDP,
1361                         "xfer %u < threshold %u, no ddp.\n",
1362                         xferlen, DDP_THRESHOLD);
1363                 return NULL;
1364         }
1365
1366         gl = kzalloc(sizeof(struct cxgbi_gather_list) +
1367                      npages * (sizeof(dma_addr_t) +
1368                      sizeof(struct page *)), gfp);
1369         if (!gl) {
1370                 log_debug(1 << CXGBI_DBG_DDP,
1371                         "xfer %u, %u pages, OOM.\n", xferlen, npages);
1372                 return NULL;
1373         }
1374
1375          log_debug(1 << CXGBI_DBG_DDP,
1376                 "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages);
1377
1378         gl->pages = (struct page **)&gl->phys_addr[npages];
1379         gl->nelem = npages;
1380         gl->length = xferlen;
1381         gl->offset = sgoffset;
1382         gl->pages[0] = sgpage;
1383
1384         for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt;
1385                 i++, sg = sg_next(sg)) {
1386                 struct page *page = sg_page(sg);
1387
1388                 if (sgpage == page && sg->offset == sgoffset + sglen)
1389                         sglen += sg->length;
1390                 else {
1391                         /*  make sure the sgl is fit for ddp:
1392                          *  each has the same page size, and
1393                          *  all of the middle pages are used completely
1394                          */
1395                         if ((j && sgoffset) || ((i != sgcnt - 1) &&
1396                             ((sglen + sgoffset) & ~PAGE_MASK))) {
1397                                 log_debug(1 << CXGBI_DBG_DDP,
1398                                         "page %d/%u, %u + %u.\n",
1399                                         i, sgcnt, sgoffset, sglen);
1400                                 goto error_out;
1401                         }
1402
1403                         j++;
1404                         if (j == gl->nelem || sg->offset) {
1405                                 log_debug(1 << CXGBI_DBG_DDP,
1406                                         "page %d/%u, offset %u.\n",
1407                                         j, gl->nelem, sg->offset);
1408                                 goto error_out;
1409                         }
1410                         gl->pages[j] = page;
1411                         sglen = sg->length;
1412                         sgoffset = sg->offset;
1413                         sgpage = page;
1414                 }
1415         }
1416         gl->nelem = ++j;
1417
1418         if (ddp_gl_map(pdev, gl) < 0)
1419                 goto error_out;
1420
1421         return gl;
1422
1423 error_out:
1424         kfree(gl);
1425         return NULL;
1426 }
1427
1428 static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag)
1429 {
1430         struct cxgbi_device *cdev = chba->cdev;
1431         struct cxgbi_ddp_info *ddp = cdev->ddp;
1432         u32 idx;
1433
1434         idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
1435         if (idx < ddp->nppods) {
1436                 struct cxgbi_gather_list *gl = ddp->gl_map[idx];
1437                 unsigned int npods;
1438
1439                 if (!gl || !gl->nelem) {
1440                         pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n",
1441                                 tag, idx, gl, gl ? gl->nelem : 0);
1442                         return;
1443                 }
1444                 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1445                 log_debug(1 << CXGBI_DBG_DDP,
1446                         "tag 0x%x, release idx %u, npods %u.\n",
1447                         tag, idx, npods);
1448                 cdev->csk_ddp_clear(chba, tag, idx, npods);
1449                 ddp_unmark_entries(ddp, idx, npods);
1450                 ddp_release_gl(gl, ddp->pdev);
1451         } else
1452                 pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods);
1453 }
1454
1455 static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid,
1456                            u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl,
1457                            gfp_t gfp)
1458 {
1459         struct cxgbi_device *cdev = csk->cdev;
1460         struct cxgbi_ddp_info *ddp = cdev->ddp;
1461         struct cxgbi_tag_format *tformat = &cdev->tag_format;
1462         struct cxgbi_pagepod_hdr hdr;
1463         unsigned int npods;
1464         int idx = -1;
1465         int err = -ENOMEM;
1466         u32 tag;
1467
1468         npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1469         if (ddp->idx_last == ddp->nppods)
1470                 idx = ddp_find_unused_entries(ddp, 0, ddp->nppods,
1471                                                         npods, gl);
1472         else {
1473                 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
1474                                                         ddp->nppods, npods,
1475                                                         gl);
1476                 if (idx < 0 && ddp->idx_last >= npods) {
1477                         idx = ddp_find_unused_entries(ddp, 0,
1478                                 min(ddp->idx_last + npods, ddp->nppods),
1479                                                         npods, gl);
1480                 }
1481         }
1482         if (idx < 0) {
1483                 log_debug(1 << CXGBI_DBG_DDP,
1484                         "xferlen %u, gl %u, npods %u NO DDP.\n",
1485                         gl->length, gl->nelem, npods);
1486                 return idx;
1487         }
1488
1489         tag = cxgbi_ddp_tag_base(tformat, sw_tag);
1490         tag |= idx << PPOD_IDX_SHIFT;
1491
1492         hdr.rsvd = 0;
1493         hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
1494         hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
1495         hdr.max_offset = htonl(gl->length);
1496         hdr.page_offset = htonl(gl->offset);
1497
1498         err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
1499         if (err < 0)
1500                 goto unmark_entries;
1501
1502         ddp->idx_last = idx;
1503         log_debug(1 << CXGBI_DBG_DDP,
1504                 "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
1505                 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
1506                 npods);
1507         *tagp = tag;
1508         return 0;
1509
1510 unmark_entries:
1511         ddp_unmark_entries(ddp, idx, npods);
1512         return err;
1513 }
1514
1515 int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
1516                         unsigned int sw_tag, unsigned int xferlen,
1517                         struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
1518 {
1519         struct cxgbi_device *cdev = csk->cdev;
1520         struct cxgbi_tag_format *tformat = &cdev->tag_format;
1521         struct cxgbi_gather_list *gl;
1522         int err;
1523
1524         if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
1525             xferlen < DDP_THRESHOLD) {
1526                 log_debug(1 << CXGBI_DBG_DDP,
1527                         "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
1528                 return -EINVAL;
1529         }
1530
1531         if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
1532                 log_debug(1 << CXGBI_DBG_DDP,
1533                         "sw_tag 0x%x NOT usable.\n", sw_tag);
1534                 return -EINVAL;
1535         }
1536
1537         gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
1538         if (!gl)
1539                 return -ENOMEM;
1540
1541         err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
1542         if (err < 0)
1543                 ddp_release_gl(gl, cdev->pdev);
1544
1545         return err;
1546 }
1547
1548 static void ddp_destroy(struct kref *kref)
1549 {
1550         struct cxgbi_ddp_info *ddp = container_of(kref,
1551                                                 struct cxgbi_ddp_info,
1552                                                 refcnt);
1553         struct cxgbi_device *cdev = ddp->cdev;
1554         int i = 0;
1555
1556         pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);
1557
1558         while (i < ddp->nppods) {
1559                 struct cxgbi_gather_list *gl = ddp->gl_map[i];
1560
1561                 if (gl) {
1562                         int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
1563                                         >> PPOD_PAGES_SHIFT;
1564                         pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
1565                         kfree(gl);
1566                         i += npods;
1567                 } else
1568                         i++;
1569         }
1570         cxgbi_free_big_mem(ddp);
1571 }
1572
1573 int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
1574 {
1575         struct cxgbi_ddp_info *ddp = cdev->ddp;
1576
1577         log_debug(1 << CXGBI_DBG_DDP,
1578                 "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
1579         cdev->ddp = NULL;
1580         if (ddp)
1581                 return kref_put(&ddp->refcnt, ddp_destroy);
1582         return 0;
1583 }
1584 EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);
1585
1586 int cxgbi_ddp_init(struct cxgbi_device *cdev,
1587                    unsigned int llimit, unsigned int ulimit,
1588                    unsigned int max_txsz, unsigned int max_rxsz)
1589 {
1590         struct cxgbi_ddp_info *ddp;
1591         unsigned int ppmax, bits;
1592
1593         ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
1594         bits = __ilog2_u32(ppmax) + 1;
1595         if (bits > PPOD_IDX_MAX_SIZE)
1596                 bits = PPOD_IDX_MAX_SIZE;
1597         ppmax = (1 << (bits - 1)) - 1;
1598
1599         ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
1600                                 ppmax * (sizeof(struct cxgbi_gather_list *) +
1601                                          sizeof(struct sk_buff *)),
1602                                 GFP_KERNEL);
1603         if (!ddp) {
1604                 pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
1605                 return -ENOMEM;
1606         }
1607         ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
1608         cdev->ddp = ddp;
1609
1610         spin_lock_init(&ddp->map_lock);
1611         kref_init(&ddp->refcnt);
1612
1613         ddp->cdev = cdev;
1614         ddp->pdev = cdev->pdev;
1615         ddp->llimit = llimit;
1616         ddp->ulimit = ulimit;
1617         ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
1618         ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
1619         ddp->nppods = ppmax;
1620         ddp->idx_last = ppmax;
1621         ddp->idx_bits = bits;
1622         ddp->idx_mask = (1 << bits) - 1;
1623         ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
1624
1625         cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
1626         cdev->tag_format.rsvd_bits = ddp->idx_bits;
1627         cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
1628         cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;
1629
1630         pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
1631                 cdev->ports[0]->name, cdev->tag_format.sw_bits,
1632                 cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
1633                 cdev->tag_format.rsvd_mask);
1634
1635         cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1636                                 ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1637         cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1638                                 ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1639
1640         log_debug(1 << CXGBI_DBG_DDP,
1641                 "%s max payload size: %u/%u, %u/%u.\n",
1642                 cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
1643                 cdev->rx_max_size, ddp->max_rxsz);
1644         return 0;
1645 }
1646 EXPORT_SYMBOL_GPL(cxgbi_ddp_init);
1647
1648 /*
1649  * APIs interacting with open-iscsi libraries
1650  */
1651
1652 static unsigned char padding[4];
1653
1654 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1655 {
1656         struct scsi_cmnd *sc = task->sc;
1657         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1658         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1659         struct cxgbi_hba *chba = cconn->chba;
1660         struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1661         u32 tag = ntohl((__force u32)hdr_itt);
1662
1663         log_debug(1 << CXGBI_DBG_DDP,
1664                    "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
1665         if (sc &&
1666             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1667             cxgbi_is_ddp_tag(tformat, tag))
1668                 ddp_tag_release(chba, tag);
1669 }
1670
1671 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1672 {
1673         struct scsi_cmnd *sc = task->sc;
1674         struct iscsi_conn *conn = task->conn;
1675         struct iscsi_session *sess = conn->session;
1676         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1677         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1678         struct cxgbi_hba *chba = cconn->chba;
1679         struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1680         u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
1681         u32 tag = 0;
1682         int err = -EINVAL;
1683
1684         if (sc &&
1685             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
1686                 err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
1687                                         scsi_in(sc)->length,
1688                                         scsi_in(sc)->table.sgl,
1689                                         scsi_in(sc)->table.nents,
1690                                         GFP_ATOMIC);
1691                 if (err < 0)
1692                         log_debug(1 << CXGBI_DBG_DDP,
1693                                 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1694                                 cconn->cep->csk, task, scsi_in(sc)->length,
1695                                 scsi_in(sc)->table.nents);
1696         }
1697
1698         if (err < 0)
1699                 tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
1700         /*  the itt need to sent in big-endian order */
1701         *hdr_itt = (__force itt_t)htonl(tag);
1702
1703         log_debug(1 << CXGBI_DBG_DDP,
1704                 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1705                 chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1706         return 0;
1707 }
1708
1709 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1710 {
1711         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1712         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1713         struct cxgbi_device *cdev = cconn->chba->cdev;
1714         u32 tag = ntohl((__force u32) itt);
1715         u32 sw_bits;
1716
1717         sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag);
1718         if (idx)
1719                 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
1720         if (age)
1721                 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
1722
1723         log_debug(1 << CXGBI_DBG_DDP,
1724                 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1725                 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1726                 age ? *age : 0xFF);
1727 }
1728 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1729
1730 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1731 {
1732         struct iscsi_conn *conn = csk->user_data;
1733
1734         if (conn) {
1735                 log_debug(1 << CXGBI_DBG_SOCK,
1736                         "csk 0x%p, cid %d.\n", csk, conn->id);
1737                 iscsi_conn_queue_work(conn);
1738         }
1739 }
1740 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1741
1742 /*
1743  * pdu receive, interact with libiscsi_tcp
1744  */
1745 static inline int read_pdu_skb(struct iscsi_conn *conn,
1746                                struct sk_buff *skb,
1747                                unsigned int offset,
1748                                int offloaded)
1749 {
1750         int status = 0;
1751         int bytes_read;
1752
1753         bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1754         switch (status) {
1755         case ISCSI_TCP_CONN_ERR:
1756                 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1757                           skb, offset, offloaded);
1758                 return -EIO;
1759         case ISCSI_TCP_SUSPENDED:
1760                 log_debug(1 << CXGBI_DBG_PDU_RX,
1761                         "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1762                         skb, offset, offloaded, bytes_read);
1763                 /* no transfer - just have caller flush queue */
1764                 return bytes_read;
1765         case ISCSI_TCP_SKB_DONE:
1766                 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1767                         skb, offset, offloaded);
1768                 /*
1769                  * pdus should always fit in the skb and we should get
1770                  * segment done notifcation.
1771                  */
1772                 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1773                 return -EFAULT;
1774         case ISCSI_TCP_SEGMENT_DONE:
1775                 log_debug(1 << CXGBI_DBG_PDU_RX,
1776                         "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1777                         skb, offset, offloaded, bytes_read);
1778                 return bytes_read;
1779         default:
1780                 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1781                         skb, offset, offloaded, status);
1782                 return -EINVAL;
1783         }
1784 }
1785
1786 static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1787 {
1788         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1789
1790         log_debug(1 << CXGBI_DBG_PDU_RX,
1791                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1792                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1793
1794         if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1795                 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1796                 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1797                 return -EIO;
1798         }
1799
1800         if (conn->hdrdgst_en &&
1801             cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1802                 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1803                 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1804                 return -EIO;
1805         }
1806
1807         return read_pdu_skb(conn, skb, 0, 0);
1808 }
1809
1810 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1811                              struct sk_buff *skb, unsigned int offset)
1812 {
1813         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1814         bool offloaded = 0;
1815         int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1816
1817         log_debug(1 << CXGBI_DBG_PDU_RX,
1818                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1819                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1820
1821         if (conn->datadgst_en &&
1822             cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1823                 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1824                         conn, lskb, cxgbi_skcb_flags(lskb));
1825                 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1826                 return -EIO;
1827         }
1828
1829         if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1830                 return 0;
1831
1832         /* coalesced, add header digest length */
1833         if (lskb == skb && conn->hdrdgst_en)
1834                 offset += ISCSI_DIGEST_SIZE;
1835
1836         if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1837                 offloaded = 1;
1838
1839         if (opcode == ISCSI_OP_SCSI_DATA_IN)
1840                 log_debug(1 << CXGBI_DBG_PDU_RX,
1841                         "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1842                         skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1843                         tcp_conn->in.datalen, offloaded ? "is" : "not");
1844
1845         return read_pdu_skb(conn, skb, offset, offloaded);
1846 }
1847
1848 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1849 {
1850         struct cxgbi_device *cdev = csk->cdev;
1851         int must_send;
1852         u32 credits;
1853
1854         log_debug(1 << CXGBI_DBG_PDU_RX,
1855                 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
1856                 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1857                 csk->rcv_wup, cdev->rx_credit_thres,
1858                 cdev->rcv_win);
1859
1860         if (csk->state != CTP_ESTABLISHED)
1861                 return;
1862
1863         credits = csk->copied_seq - csk->rcv_wup;
1864         if (unlikely(!credits))
1865                 return;
1866         if (unlikely(cdev->rx_credit_thres == 0))
1867                 return;
1868
1869         must_send = credits + 16384 >= cdev->rcv_win;
1870         if (must_send || credits >= cdev->rx_credit_thres)
1871                 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1872 }
1873
1874 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1875 {
1876         struct cxgbi_device *cdev = csk->cdev;
1877         struct iscsi_conn *conn = csk->user_data;
1878         struct sk_buff *skb;
1879         unsigned int read = 0;
1880         int err = 0;
1881
1882         log_debug(1 << CXGBI_DBG_PDU_RX,
1883                 "csk 0x%p, conn 0x%p.\n", csk, conn);
1884
1885         if (unlikely(!conn || conn->suspend_rx)) {
1886                 log_debug(1 << CXGBI_DBG_PDU_RX,
1887                         "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1888                         csk, conn, conn ? conn->id : 0xFF,
1889                         conn ? conn->suspend_rx : 0xFF);
1890                 return;
1891         }
1892
1893         while (!err) {
1894                 skb = skb_peek(&csk->receive_queue);
1895                 if (!skb ||
1896                     !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1897                         if (skb)
1898                                 log_debug(1 << CXGBI_DBG_PDU_RX,
1899                                         "skb 0x%p, NOT ready 0x%lx.\n",
1900                                         skb, cxgbi_skcb_flags(skb));
1901                         break;
1902                 }
1903                 __skb_unlink(skb, &csk->receive_queue);
1904
1905                 read += cxgbi_skcb_rx_pdulen(skb);
1906                 log_debug(1 << CXGBI_DBG_PDU_RX,
1907                         "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1908                         csk, skb, skb->len, cxgbi_skcb_flags(skb),
1909                         cxgbi_skcb_rx_pdulen(skb));
1910
1911                 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1912                         err = skb_read_pdu_bhs(conn, skb);
1913                         if (err < 0) {
1914                                 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1915                                         "f 0x%lx, plen %u.\n",
1916                                         csk, skb, skb->len,
1917                                         cxgbi_skcb_flags(skb),
1918                                         cxgbi_skcb_rx_pdulen(skb));
1919                                 goto skb_done;
1920                         }
1921                         err = skb_read_pdu_data(conn, skb, skb,
1922                                                 err + cdev->skb_rx_extra);
1923                         if (err < 0)
1924                                 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1925                                         "f 0x%lx, plen %u.\n",
1926                                         csk, skb, skb->len,
1927                                         cxgbi_skcb_flags(skb),
1928                                         cxgbi_skcb_rx_pdulen(skb));
1929                 } else {
1930                         err = skb_read_pdu_bhs(conn, skb);
1931                         if (err < 0) {
1932                                 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1933                                         "f 0x%lx, plen %u.\n",
1934                                         csk, skb, skb->len,
1935                                         cxgbi_skcb_flags(skb),
1936                                         cxgbi_skcb_rx_pdulen(skb));
1937                                 goto skb_done;
1938                         }
1939
1940                         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1941                                 struct sk_buff *dskb;
1942
1943                                 dskb = skb_peek(&csk->receive_queue);
1944                                 if (!dskb) {
1945                                         pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1946                                                 " plen %u, NO data.\n",
1947                                                 csk, skb, skb->len,
1948                                                 cxgbi_skcb_flags(skb),
1949                                                 cxgbi_skcb_rx_pdulen(skb));
1950                                         err = -EIO;
1951                                         goto skb_done;
1952                                 }
1953                                 __skb_unlink(dskb, &csk->receive_queue);
1954
1955                                 err = skb_read_pdu_data(conn, skb, dskb, 0);
1956                                 if (err < 0)
1957                                         pr_err("data, csk 0x%p, skb 0x%p,%u, "
1958                                                 "f 0x%lx, plen %u, dskb 0x%p,"
1959                                                 "%u.\n",
1960                                                 csk, skb, skb->len,
1961                                                 cxgbi_skcb_flags(skb),
1962                                                 cxgbi_skcb_rx_pdulen(skb),
1963                                                 dskb, dskb->len);
1964                                 __kfree_skb(dskb);
1965                         } else
1966                                 err = skb_read_pdu_data(conn, skb, skb, 0);
1967                 }
1968 skb_done:
1969                 __kfree_skb(skb);
1970
1971                 if (err < 0)
1972                         break;
1973         }
1974
1975         log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1976         if (read) {
1977                 csk->copied_seq += read;
1978                 csk_return_rx_credits(csk, read);
1979                 conn->rxdata_octets += read;
1980         }
1981
1982         if (err < 0) {
1983                 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1984                         csk, conn, err, read);
1985                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1986         }
1987 }
1988 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1989
1990 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1991                                 unsigned int offset, unsigned int *off,
1992                                 struct scatterlist **sgp)
1993 {
1994         int i;
1995         struct scatterlist *sg;
1996
1997         for_each_sg(sgl, sg, sgcnt, i) {
1998                 if (offset < sg->length) {
1999                         *off = offset;
2000                         *sgp = sg;
2001                         return 0;
2002                 }
2003                 offset -= sg->length;
2004         }
2005         return -EFAULT;
2006 }
2007
2008 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
2009                                 unsigned int dlen, struct page_frag *frags,
2010                                 int frag_max)
2011 {
2012         unsigned int datalen = dlen;
2013         unsigned int sglen = sg->length - sgoffset;
2014         struct page *page = sg_page(sg);
2015         int i;
2016
2017         i = 0;
2018         do {
2019                 unsigned int copy;
2020
2021                 if (!sglen) {
2022                         sg = sg_next(sg);
2023                         if (!sg) {
2024                                 pr_warn("sg %d NULL, len %u/%u.\n",
2025                                         i, datalen, dlen);
2026                                 return -EINVAL;
2027                         }
2028                         sgoffset = 0;
2029                         sglen = sg->length;
2030                         page = sg_page(sg);
2031
2032                 }
2033                 copy = min(datalen, sglen);
2034                 if (i && page == frags[i - 1].page &&
2035                     sgoffset + sg->offset ==
2036                         frags[i - 1].offset + frags[i - 1].size) {
2037                         frags[i - 1].size += copy;
2038                 } else {
2039                         if (i >= frag_max) {
2040                                 pr_warn("too many pages %u, dlen %u.\n",
2041                                         frag_max, dlen);
2042                                 return -EINVAL;
2043                         }
2044
2045                         frags[i].page = page;
2046                         frags[i].offset = sg->offset + sgoffset;
2047                         frags[i].size = copy;
2048                         i++;
2049                 }
2050                 datalen -= copy;
2051                 sgoffset += copy;
2052                 sglen -= copy;
2053         } while (datalen);
2054
2055         return i;
2056 }
2057
2058 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
2059 {
2060         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2061         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2062         struct cxgbi_device *cdev = cconn->chba->cdev;
2063         struct iscsi_conn *conn = task->conn;
2064         struct iscsi_tcp_task *tcp_task = task->dd_data;
2065         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2066         struct scsi_cmnd *sc = task->sc;
2067         int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
2068
2069         tcp_task->dd_data = tdata;
2070         task->hdr = NULL;
2071
2072         if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
2073             (opcode == ISCSI_OP_SCSI_DATA_OUT ||
2074              (opcode == ISCSI_OP_SCSI_CMD &&
2075               (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
2076                 /* data could goes into skb head */
2077                 headroom += min_t(unsigned int,
2078                                 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
2079                                 conn->max_xmit_dlength);
2080
2081         tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
2082         if (!tdata->skb) {
2083                 struct cxgbi_sock *csk = cconn->cep->csk;
2084                 struct net_device *ndev = cdev->ports[csk->port_id];
2085                 ndev->stats.tx_dropped++;
2086                 return -ENOMEM;
2087         }
2088
2089         skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
2090         task->hdr = (struct iscsi_hdr *)tdata->skb->data;
2091         task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
2092
2093         /* data_out uses scsi_cmd's itt */
2094         if (opcode != ISCSI_OP_SCSI_DATA_OUT)
2095                 task_reserve_itt(task, &task->hdr->itt);
2096
2097         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2098                 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
2099                 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
2100                 conn->max_xmit_dlength, ntohl(task->hdr->itt));
2101
2102         return 0;
2103 }
2104 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
2105
2106 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
2107 {
2108         if (hcrc || dcrc) {
2109                 u8 submode = 0;
2110
2111                 if (hcrc)
2112                         submode |= 1;
2113                 if (dcrc)
2114                         submode |= 2;
2115                 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
2116         } else
2117                 cxgbi_skcb_ulp_mode(skb) = 0;
2118 }
2119
2120 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
2121                               unsigned int count)
2122 {
2123         struct iscsi_conn *conn = task->conn;
2124         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2125         struct sk_buff *skb = tdata->skb;
2126         unsigned int datalen = count;
2127         int i, padlen = iscsi_padding(count);
2128         struct page *pg;
2129
2130         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2131                 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
2132                 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
2133                 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
2134
2135         skb_put(skb, task->hdr_len);
2136         tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
2137         if (!count)
2138                 return 0;
2139
2140         if (task->sc) {
2141                 struct scsi_data_buffer *sdb = scsi_out(task->sc);
2142                 struct scatterlist *sg = NULL;
2143                 int err;
2144
2145                 tdata->offset = offset;
2146                 tdata->count = count;
2147                 err = sgl_seek_offset(
2148                                         sdb->table.sgl, sdb->table.nents,
2149                                         tdata->offset, &tdata->sgoffset, &sg);
2150                 if (err < 0) {
2151                         pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
2152                                 sdb->table.nents, tdata->offset, sdb->length);
2153                         return err;
2154                 }
2155                 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
2156                                         tdata->frags, MAX_PDU_FRAGS);
2157                 if (err < 0) {
2158                         pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
2159                                 sdb->table.nents, tdata->offset, tdata->count);
2160                         return err;
2161                 }
2162                 tdata->nr_frags = err;
2163
2164                 if (tdata->nr_frags > MAX_SKB_FRAGS ||
2165                     (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
2166                         char *dst = skb->data + task->hdr_len;
2167                         struct page_frag *frag = tdata->frags;
2168
2169                         /* data fits in the skb's headroom */
2170                         for (i = 0; i < tdata->nr_frags; i++, frag++) {
2171                                 char *src = kmap_atomic(frag->page);
2172
2173                                 memcpy(dst, src+frag->offset, frag->size);
2174                                 dst += frag->size;
2175                                 kunmap_atomic(src);
2176                         }
2177                         if (padlen) {
2178                                 memset(dst, 0, padlen);
2179                                 padlen = 0;
2180                         }
2181                         skb_put(skb, count + padlen);
2182                 } else {
2183                         /* data fit into frag_list */
2184                         for (i = 0; i < tdata->nr_frags; i++) {
2185                                 __skb_fill_page_desc(skb, i,
2186                                                 tdata->frags[i].page,
2187                                                 tdata->frags[i].offset,
2188                                                 tdata->frags[i].size);
2189                                 skb_frag_ref(skb, i);
2190                         }
2191                         skb_shinfo(skb)->nr_frags = tdata->nr_frags;
2192                         skb->len += count;
2193                         skb->data_len += count;
2194                         skb->truesize += count;
2195                 }
2196
2197         } else {
2198                 pg = virt_to_page(task->data);
2199
2200                 get_page(pg);
2201                 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2202                                         count);
2203                 skb->len += count;
2204                 skb->data_len += count;
2205                 skb->truesize += count;
2206         }
2207
2208         if (padlen) {
2209                 i = skb_shinfo(skb)->nr_frags;
2210                 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2211                                 virt_to_page(padding), offset_in_page(padding),
2212                                 padlen);
2213
2214                 skb->data_len += padlen;
2215                 skb->truesize += padlen;
2216                 skb->len += padlen;
2217         }
2218
2219         return 0;
2220 }
2221 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2222
2223 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2224 {
2225         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2226         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2227         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2228         struct sk_buff *skb = tdata->skb;
2229         unsigned int datalen;
2230         int err;
2231
2232         if (!skb) {
2233                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2234                         "task 0x%p, skb NULL.\n", task);
2235                 return 0;
2236         }
2237
2238         datalen = skb->data_len;
2239         tdata->skb = NULL;
2240         err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2241         if (err > 0) {
2242                 int pdulen = err;
2243
2244                 log_debug(1 << CXGBI_DBG_PDU_TX,
2245                         "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2246                         task, task->sc, skb, skb->len, skb->data_len, err);
2247
2248                 if (task->conn->hdrdgst_en)
2249                         pdulen += ISCSI_DIGEST_SIZE;
2250
2251                 if (datalen && task->conn->datadgst_en)
2252                         pdulen += ISCSI_DIGEST_SIZE;
2253
2254                 task->conn->txdata_octets += pdulen;
2255                 return 0;
2256         }
2257
2258         if (err == -EAGAIN || err == -ENOBUFS) {
2259                 log_debug(1 << CXGBI_DBG_PDU_TX,
2260                         "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2261                         task, skb, skb->len, skb->data_len, err);
2262                 /* reset skb to send when we are called again */
2263                 tdata->skb = skb;
2264                 return err;
2265         }
2266
2267         kfree_skb(skb);
2268         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2269                 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2270                 task->itt, skb, skb->len, skb->data_len, err);
2271         iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2272         iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2273         return err;
2274 }
2275 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2276
2277 void cxgbi_cleanup_task(struct iscsi_task *task)
2278 {
2279         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2280
2281         log_debug(1 << CXGBI_DBG_ISCSI,
2282                 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2283                 task, tdata->skb, task->hdr_itt);
2284
2285         /*  never reached the xmit task callout */
2286         if (tdata->skb)
2287                 __kfree_skb(tdata->skb);
2288         memset(tdata, 0, sizeof(*tdata));
2289
2290         task_release_itt(task, task->hdr_itt);
2291         iscsi_tcp_cleanup_task(task);
2292 }
2293 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2294
2295 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2296                                 struct iscsi_stats *stats)
2297 {
2298         struct iscsi_conn *conn = cls_conn->dd_data;
2299
2300         stats->txdata_octets = conn->txdata_octets;
2301         stats->rxdata_octets = conn->rxdata_octets;
2302         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2303         stats->dataout_pdus = conn->dataout_pdus_cnt;
2304         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2305         stats->datain_pdus = conn->datain_pdus_cnt;
2306         stats->r2t_pdus = conn->r2t_pdus_cnt;
2307         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2308         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2309         stats->digest_err = 0;
2310         stats->timeout_err = 0;
2311         stats->custom_length = 1;
2312         strcpy(stats->custom[0].desc, "eh_abort_cnt");
2313         stats->custom[0].value = conn->eh_abort_cnt;
2314 }
2315 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2316
2317 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2318 {
2319         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2320         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2321         struct cxgbi_device *cdev = cconn->chba->cdev;
2322         unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2323         unsigned int max_def = 512 * MAX_SKB_FRAGS;
2324         unsigned int max = max(max_def, headroom);
2325
2326         max = min(cconn->chba->cdev->tx_max_size, max);
2327         if (conn->max_xmit_dlength)
2328                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2329         else
2330                 conn->max_xmit_dlength = max;
2331         cxgbi_align_pdu_size(conn->max_xmit_dlength);
2332
2333         return 0;
2334 }
2335
2336 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2337 {
2338         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2339         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2340         unsigned int max = cconn->chba->cdev->rx_max_size;
2341
2342         cxgbi_align_pdu_size(max);
2343
2344         if (conn->max_recv_dlength) {
2345                 if (conn->max_recv_dlength > max) {
2346                         pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2347                                 conn->max_recv_dlength, max);
2348                         return -EINVAL;
2349                 }
2350                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2351                 cxgbi_align_pdu_size(conn->max_recv_dlength);
2352         } else
2353                 conn->max_recv_dlength = max;
2354
2355         return 0;
2356 }
2357
2358 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2359                         enum iscsi_param param, char *buf, int buflen)
2360 {
2361         struct iscsi_conn *conn = cls_conn->dd_data;
2362         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2363         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2364         struct cxgbi_sock *csk = cconn->cep->csk;
2365         int err;
2366
2367         log_debug(1 << CXGBI_DBG_ISCSI,
2368                 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2369                 cls_conn, param, buflen, buf);
2370
2371         switch (param) {
2372         case ISCSI_PARAM_HDRDGST_EN:
2373                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2374                 if (!err && conn->hdrdgst_en)
2375                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2376                                                         conn->hdrdgst_en,
2377                                                         conn->datadgst_en, 0);
2378                 break;
2379         case ISCSI_PARAM_DATADGST_EN:
2380                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2381                 if (!err && conn->datadgst_en)
2382                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2383                                                         conn->hdrdgst_en,
2384                                                         conn->datadgst_en, 0);
2385                 break;
2386         case ISCSI_PARAM_MAX_R2T:
2387                 return iscsi_tcp_set_max_r2t(conn, buf);
2388         case ISCSI_PARAM_MAX_RECV_DLENGTH:
2389                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2390                 if (!err)
2391                         err = cxgbi_conn_max_recv_dlength(conn);
2392                 break;
2393         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2394                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2395                 if (!err)
2396                         err = cxgbi_conn_max_xmit_dlength(conn);
2397                 break;
2398         default:
2399                 return iscsi_set_param(cls_conn, param, buf, buflen);
2400         }
2401         return err;
2402 }
2403 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2404
2405 static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2406 {
2407         int len;
2408
2409         cxgbi_sock_get(csk);
2410         len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2411         cxgbi_sock_put(csk);
2412
2413         return len;
2414 }
2415
2416 static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2417 {
2418         int len;
2419
2420         cxgbi_sock_get(csk);
2421         if (csk->csk_family == AF_INET)
2422                 len = sprintf(buf, "%pI4",
2423                               &csk->daddr.sin_addr.s_addr);
2424         else
2425                 len = sprintf(buf, "%pI6",
2426                               &csk->daddr6.sin6_addr);
2427
2428         cxgbi_sock_put(csk);
2429
2430         return len;
2431 }
2432
2433 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2434                        char *buf)
2435 {
2436         struct cxgbi_endpoint *cep = ep->dd_data;
2437         struct cxgbi_sock *csk;
2438         int len;
2439
2440         log_debug(1 << CXGBI_DBG_ISCSI,
2441                 "cls_conn 0x%p, param %d.\n", ep, param);
2442
2443         switch (param) {
2444         case ISCSI_PARAM_CONN_PORT:
2445         case ISCSI_PARAM_CONN_ADDRESS:
2446                 if (!cep)
2447                         return -ENOTCONN;
2448
2449                 csk = cep->csk;
2450                 if (!csk)
2451                         return -ENOTCONN;
2452
2453                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2454                                                  &csk->daddr, param, buf);
2455         default:
2456                 return -ENOSYS;
2457         }
2458         return len;
2459 }
2460 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2461
2462 struct iscsi_cls_conn *
2463 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2464 {
2465         struct iscsi_cls_conn *cls_conn;
2466         struct iscsi_conn *conn;
2467         struct iscsi_tcp_conn *tcp_conn;
2468         struct cxgbi_conn *cconn;
2469
2470         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2471         if (!cls_conn)
2472                 return NULL;
2473
2474         conn = cls_conn->dd_data;
2475         tcp_conn = conn->dd_data;
2476         cconn = tcp_conn->dd_data;
2477         cconn->iconn = conn;
2478
2479         log_debug(1 << CXGBI_DBG_ISCSI,
2480                 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2481                 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2482
2483         return cls_conn;
2484 }
2485 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2486
2487 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2488                                 struct iscsi_cls_conn *cls_conn,
2489                                 u64 transport_eph, int is_leading)
2490 {
2491         struct iscsi_conn *conn = cls_conn->dd_data;
2492         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2493         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2494         struct iscsi_endpoint *ep;
2495         struct cxgbi_endpoint *cep;
2496         struct cxgbi_sock *csk;
2497         int err;
2498
2499         ep = iscsi_lookup_endpoint(transport_eph);
2500         if (!ep)
2501                 return -EINVAL;
2502
2503         /*  setup ddp pagesize */
2504         cep = ep->dd_data;
2505         csk = cep->csk;
2506         err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0);
2507         if (err < 0)
2508                 return err;
2509
2510         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2511         if (err)
2512                 return -EINVAL;
2513
2514         /*  calculate the tag idx bits needed for this conn based on cmds_max */
2515         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2516
2517         write_lock_bh(&csk->callback_lock);
2518         csk->user_data = conn;
2519         cconn->chba = cep->chba;
2520         cconn->cep = cep;
2521         cep->cconn = cconn;
2522         write_unlock_bh(&csk->callback_lock);
2523
2524         cxgbi_conn_max_xmit_dlength(conn);
2525         cxgbi_conn_max_recv_dlength(conn);
2526
2527         log_debug(1 << CXGBI_DBG_ISCSI,
2528                 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2529                 cls_session, cls_conn, ep, cconn, csk);
2530         /*  init recv engine */
2531         iscsi_tcp_hdr_recv_prep(tcp_conn);
2532
2533         return 0;
2534 }
2535 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2536
2537 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2538                                                 u16 cmds_max, u16 qdepth,
2539                                                 u32 initial_cmdsn)
2540 {
2541         struct cxgbi_endpoint *cep;
2542         struct cxgbi_hba *chba;
2543         struct Scsi_Host *shost;
2544         struct iscsi_cls_session *cls_session;
2545         struct iscsi_session *session;
2546
2547         if (!ep) {
2548                 pr_err("missing endpoint.\n");
2549                 return NULL;
2550         }
2551
2552         cep = ep->dd_data;
2553         chba = cep->chba;
2554         shost = chba->shost;
2555
2556         BUG_ON(chba != iscsi_host_priv(shost));
2557
2558         cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2559                                         cmds_max, 0,
2560                                         sizeof(struct iscsi_tcp_task) +
2561                                         sizeof(struct cxgbi_task_data),
2562                                         initial_cmdsn, ISCSI_MAX_TARGET);
2563         if (!cls_session)
2564                 return NULL;
2565
2566         session = cls_session->dd_data;
2567         if (iscsi_tcp_r2tpool_alloc(session))
2568                 goto remove_session;
2569
2570         log_debug(1 << CXGBI_DBG_ISCSI,
2571                 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2572         return cls_session;
2573
2574 remove_session:
2575         iscsi_session_teardown(cls_session);
2576         return NULL;
2577 }
2578 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2579
2580 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2581 {
2582         log_debug(1 << CXGBI_DBG_ISCSI,
2583                 "cls sess 0x%p.\n", cls_session);
2584
2585         iscsi_tcp_r2tpool_free(cls_session->dd_data);
2586         iscsi_session_teardown(cls_session);
2587 }
2588 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2589
2590 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2591                         char *buf, int buflen)
2592 {
2593         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2594
2595         if (!chba->ndev) {
2596                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2597                                 "netdev for host not set.\n");
2598                 return -ENODEV;
2599         }
2600
2601         log_debug(1 << CXGBI_DBG_ISCSI,
2602                 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2603                 shost, chba, chba->ndev->name, param, buflen, buf);
2604
2605         switch (param) {
2606         case ISCSI_HOST_PARAM_IPADDRESS:
2607         {
2608                 __be32 addr = in_aton(buf);
2609                 log_debug(1 << CXGBI_DBG_ISCSI,
2610                         "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2611                 cxgbi_set_iscsi_ipv4(chba, addr);
2612                 return 0;
2613         }
2614         case ISCSI_HOST_PARAM_HWADDRESS:
2615         case ISCSI_HOST_PARAM_NETDEV_NAME:
2616                 return 0;
2617         default:
2618                 return iscsi_host_set_param(shost, param, buf, buflen);
2619         }
2620 }
2621 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2622
2623 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2624                         char *buf)
2625 {
2626         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2627         int len = 0;
2628
2629         if (!chba->ndev) {
2630                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2631                                 "netdev for host not set.\n");
2632                 return -ENODEV;
2633         }
2634
2635         log_debug(1 << CXGBI_DBG_ISCSI,
2636                 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2637                 shost, chba, chba->ndev->name, param);
2638
2639         switch (param) {
2640         case ISCSI_HOST_PARAM_HWADDRESS:
2641                 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2642                 break;
2643         case ISCSI_HOST_PARAM_NETDEV_NAME:
2644                 len = sprintf(buf, "%s\n", chba->ndev->name);
2645                 break;
2646         case ISCSI_HOST_PARAM_IPADDRESS:
2647         {
2648                 __be32 addr;
2649
2650                 addr = cxgbi_get_iscsi_ipv4(chba);
2651                 len = sprintf(buf, "%pI4", &addr);
2652                 log_debug(1 << CXGBI_DBG_ISCSI,
2653                         "hba %s, ipv4 %pI4.\n", chba->ndev->name, &addr);
2654                 break;
2655         }
2656         default:
2657                 return iscsi_host_get_param(shost, param, buf);
2658         }
2659
2660         return len;
2661 }
2662 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2663
2664 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2665                                         struct sockaddr *dst_addr,
2666                                         int non_blocking)
2667 {
2668         struct iscsi_endpoint *ep;
2669         struct cxgbi_endpoint *cep;
2670         struct cxgbi_hba *hba = NULL;
2671         struct cxgbi_sock *csk;
2672         int err = -EINVAL;
2673
2674         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2675                 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2676                 shost, non_blocking, dst_addr);
2677
2678         if (shost) {
2679                 hba = iscsi_host_priv(shost);
2680                 if (!hba) {
2681                         pr_info("shost 0x%p, priv NULL.\n", shost);
2682                         goto err_out;
2683                 }
2684         }
2685
2686         if (dst_addr->sa_family == AF_INET) {
2687                 csk = cxgbi_check_route(dst_addr);
2688 #if IS_ENABLED(CONFIG_IPV6)
2689         } else if (dst_addr->sa_family == AF_INET6) {
2690                 csk = cxgbi_check_route6(dst_addr);
2691 #endif
2692         } else {
2693                 pr_info("address family 0x%x NOT supported.\n",
2694                         dst_addr->sa_family);
2695                 err = -EAFNOSUPPORT;
2696                 return (struct iscsi_endpoint *)ERR_PTR(err);
2697         }
2698
2699         if (IS_ERR(csk))
2700                 return (struct iscsi_endpoint *)csk;
2701         cxgbi_sock_get(csk);
2702
2703         if (!hba)
2704                 hba = csk->cdev->hbas[csk->port_id];
2705         else if (hba != csk->cdev->hbas[csk->port_id]) {
2706                 pr_info("Could not connect through requested host %u"
2707                         "hba 0x%p != 0x%p (%u).\n",
2708                         shost->host_no, hba,
2709                         csk->cdev->hbas[csk->port_id], csk->port_id);
2710                 err = -ENOSPC;
2711                 goto release_conn;
2712         }
2713
2714         err = sock_get_port(csk);
2715         if (err)
2716                 goto release_conn;
2717
2718         cxgbi_sock_set_state(csk, CTP_CONNECTING);
2719         err = csk->cdev->csk_init_act_open(csk);
2720         if (err)
2721                 goto release_conn;
2722
2723         if (cxgbi_sock_is_closing(csk)) {
2724                 err = -ENOSPC;
2725                 pr_info("csk 0x%p is closing.\n", csk);
2726                 goto release_conn;
2727         }
2728
2729         ep = iscsi_create_endpoint(sizeof(*cep));
2730         if (!ep) {
2731                 err = -ENOMEM;
2732                 pr_info("iscsi alloc ep, OOM.\n");
2733                 goto release_conn;
2734         }
2735
2736         cep = ep->dd_data;
2737         cep->csk = csk;
2738         cep->chba = hba;
2739
2740         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2741                 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2742                 ep, cep, csk, hba, hba->ndev->name);
2743         return ep;
2744
2745 release_conn:
2746         cxgbi_sock_put(csk);
2747         cxgbi_sock_closed(csk);
2748 err_out:
2749         return ERR_PTR(err);
2750 }
2751 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2752
2753 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2754 {
2755         struct cxgbi_endpoint *cep = ep->dd_data;
2756         struct cxgbi_sock *csk = cep->csk;
2757
2758         if (!cxgbi_sock_is_established(csk))
2759                 return 0;
2760         return 1;
2761 }
2762 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2763
2764 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2765 {
2766         struct cxgbi_endpoint *cep = ep->dd_data;
2767         struct cxgbi_conn *cconn = cep->cconn;
2768         struct cxgbi_sock *csk = cep->csk;
2769
2770         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2771                 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2772                 ep, cep, cconn, csk, csk->state, csk->flags);
2773
2774         if (cconn && cconn->iconn) {
2775                 iscsi_suspend_tx(cconn->iconn);
2776                 write_lock_bh(&csk->callback_lock);
2777                 cep->csk->user_data = NULL;
2778                 cconn->cep = NULL;
2779                 write_unlock_bh(&csk->callback_lock);
2780         }
2781         iscsi_destroy_endpoint(ep);
2782
2783         if (likely(csk->state >= CTP_ESTABLISHED))
2784                 need_active_close(csk);
2785         else
2786                 cxgbi_sock_closed(csk);
2787
2788         cxgbi_sock_put(csk);
2789 }
2790 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2791
2792 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2793                         struct scsi_transport_template **stt)
2794 {
2795         *stt = iscsi_register_transport(itp);
2796         if (*stt == NULL) {
2797                 pr_err("unable to register %s transport 0x%p.\n",
2798                         itp->name, itp);
2799                 return -ENODEV;
2800         }
2801         log_debug(1 << CXGBI_DBG_ISCSI,
2802                 "%s, registered iscsi transport 0x%p.\n",
2803                 itp->name, stt);
2804         return 0;
2805 }
2806 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2807
2808 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2809                         struct scsi_transport_template **stt)
2810 {
2811         if (*stt) {
2812                 log_debug(1 << CXGBI_DBG_ISCSI,
2813                         "de-register transport 0x%p, %s, stt 0x%p.\n",
2814                         itp, itp->name, *stt);
2815                 *stt = NULL;
2816                 iscsi_unregister_transport(itp);
2817         }
2818 }
2819 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2820
2821 umode_t cxgbi_attr_is_visible(int param_type, int param)
2822 {
2823         switch (param_type) {
2824         case ISCSI_HOST_PARAM:
2825                 switch (param) {
2826                 case ISCSI_HOST_PARAM_NETDEV_NAME:
2827                 case ISCSI_HOST_PARAM_HWADDRESS:
2828                 case ISCSI_HOST_PARAM_IPADDRESS:
2829                 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2830                         return S_IRUGO;
2831                 default:
2832                         return 0;
2833                 }
2834         case ISCSI_PARAM:
2835                 switch (param) {
2836                 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2837                 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2838                 case ISCSI_PARAM_HDRDGST_EN:
2839                 case ISCSI_PARAM_DATADGST_EN:
2840                 case ISCSI_PARAM_CONN_ADDRESS:
2841                 case ISCSI_PARAM_CONN_PORT:
2842                 case ISCSI_PARAM_EXP_STATSN:
2843                 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2844                 case ISCSI_PARAM_PERSISTENT_PORT:
2845                 case ISCSI_PARAM_PING_TMO:
2846                 case ISCSI_PARAM_RECV_TMO:
2847                 case ISCSI_PARAM_INITIAL_R2T_EN:
2848                 case ISCSI_PARAM_MAX_R2T:
2849                 case ISCSI_PARAM_IMM_DATA_EN:
2850                 case ISCSI_PARAM_FIRST_BURST:
2851                 case ISCSI_PARAM_MAX_BURST:
2852                 case ISCSI_PARAM_PDU_INORDER_EN:
2853                 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2854                 case ISCSI_PARAM_ERL:
2855                 case ISCSI_PARAM_TARGET_NAME:
2856                 case ISCSI_PARAM_TPGT:
2857                 case ISCSI_PARAM_USERNAME:
2858                 case ISCSI_PARAM_PASSWORD:
2859                 case ISCSI_PARAM_USERNAME_IN:
2860                 case ISCSI_PARAM_PASSWORD_IN:
2861                 case ISCSI_PARAM_FAST_ABORT:
2862                 case ISCSI_PARAM_ABORT_TMO:
2863                 case ISCSI_PARAM_LU_RESET_TMO:
2864                 case ISCSI_PARAM_TGT_RESET_TMO:
2865                 case ISCSI_PARAM_IFACE_NAME:
2866                 case ISCSI_PARAM_INITIATOR_NAME:
2867                         return S_IRUGO;
2868                 default:
2869                         return 0;
2870                 }
2871         }
2872
2873         return 0;
2874 }
2875 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2876
2877 static int __init libcxgbi_init_module(void)
2878 {
2879         sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
2880         sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
2881
2882         pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
2883                 ISCSI_ITT_MASK, sw_tag_idx_bits,
2884                 ISCSI_AGE_MASK, sw_tag_age_bits);
2885
2886         ddp_setup_host_page_size();
2887         return 0;
2888 }
2889
2890 static void __exit libcxgbi_exit_module(void)
2891 {
2892         cxgbi_device_unregister_all(0xFF);
2893         return;
2894 }
2895
2896 module_init(libcxgbi_init_module);
2897 module_exit(libcxgbi_exit_module);