2 * This file is part of the Chelsio T6 Crypto driver for Linux.
4 * Copyright (c) 2003-2017 Chelsio Communications, Inc. All rights reserved.
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34 * Written and Maintained by:
38 #define pr_fmt(fmt) "chcr:" fmt
40 #include <linux/kernel.h>
41 #include <linux/module.h>
42 #include <linux/crypto.h>
43 #include <linux/cryptohash.h>
44 #include <linux/skbuff.h>
45 #include <linux/rtnetlink.h>
46 #include <linux/highmem.h>
47 #include <linux/if_vlan.h>
49 #include <linux/netdevice.h>
52 #include <crypto/aes.h>
53 #include <crypto/algapi.h>
54 #include <crypto/hash.h>
55 #include <crypto/sha.h>
56 #include <crypto/authenc.h>
57 #include <crypto/internal/aead.h>
58 #include <crypto/null.h>
59 #include <crypto/internal/skcipher.h>
60 #include <crypto/aead.h>
61 #include <crypto/scatterwalk.h>
62 #include <crypto/internal/hash.h>
64 #include "chcr_core.h"
65 #include "chcr_algo.h"
66 #include "chcr_crypto.h"
69 * Max Tx descriptor space we allow for an Ethernet packet to be inlined
72 #define MAX_IMM_TX_PKT_LEN 256
73 #define GCM_ESP_IV_SIZE 8
75 static int chcr_xfrm_add_state(struct xfrm_state *x);
76 static void chcr_xfrm_del_state(struct xfrm_state *x);
77 static void chcr_xfrm_free_state(struct xfrm_state *x);
78 static bool chcr_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
79 static void chcr_advance_esn_state(struct xfrm_state *x);
81 static const struct xfrmdev_ops chcr_xfrmdev_ops = {
82 .xdo_dev_state_add = chcr_xfrm_add_state,
83 .xdo_dev_state_delete = chcr_xfrm_del_state,
84 .xdo_dev_state_free = chcr_xfrm_free_state,
85 .xdo_dev_offload_ok = chcr_ipsec_offload_ok,
86 .xdo_dev_state_advance_esn = chcr_advance_esn_state,
89 /* Add offload xfrms to Chelsio Interface */
90 void chcr_add_xfrmops(const struct cxgb4_lld_info *lld)
92 struct net_device *netdev = NULL;
95 for (i = 0; i < lld->nports; i++) {
96 netdev = lld->ports[i];
99 netdev->xfrmdev_ops = &chcr_xfrmdev_ops;
100 netdev->hw_enc_features |= NETIF_F_HW_ESP;
101 netdev->features |= NETIF_F_HW_ESP;
103 netdev_change_features(netdev);
108 static inline int chcr_ipsec_setauthsize(struct xfrm_state *x,
109 struct ipsec_sa_entry *sa_entry)
112 int authsize = x->aead->alg_icv_len / 8;
114 sa_entry->authsize = authsize;
118 hmac_ctrl = CHCR_SCMD_HMAC_CTRL_DIV2;
121 hmac_ctrl = CHCR_SCMD_HMAC_CTRL_IPSEC_96BIT;
124 hmac_ctrl = CHCR_SCMD_HMAC_CTRL_NO_TRUNC;
132 static inline int chcr_ipsec_setkey(struct xfrm_state *x,
133 struct ipsec_sa_entry *sa_entry)
135 struct crypto_cipher *cipher;
136 int keylen = (x->aead->alg_key_len + 7) / 8;
137 unsigned char *key = x->aead->alg_key;
138 int ck_size, key_ctx_size = 0;
139 unsigned char ghash_h[AEAD_H_SIZE];
143 keylen -= 4; /* nonce/salt is present in the last 4 bytes */
144 memcpy(sa_entry->salt, key + keylen, 4);
147 if (keylen == AES_KEYSIZE_128) {
148 ck_size = CHCR_KEYCTX_CIPHER_KEY_SIZE_128;
149 } else if (keylen == AES_KEYSIZE_192) {
150 ck_size = CHCR_KEYCTX_CIPHER_KEY_SIZE_192;
151 } else if (keylen == AES_KEYSIZE_256) {
152 ck_size = CHCR_KEYCTX_CIPHER_KEY_SIZE_256;
154 pr_err("GCM: Invalid key length %d\n", keylen);
159 memcpy(sa_entry->key, key, keylen);
160 sa_entry->enckey_len = keylen;
161 key_ctx_size = sizeof(struct _key_ctx) +
162 ((DIV_ROUND_UP(keylen, 16)) << 4) +
165 sa_entry->key_ctx_hdr = FILL_KEY_CTX_HDR(ck_size,
166 CHCR_KEYCTX_MAC_KEY_SIZE_128,
170 /* Calculate the H = CIPH(K, 0 repeated 16 times).
171 * It will go in key context
173 cipher = crypto_alloc_cipher("aes-generic", 0, 0);
174 if (IS_ERR(cipher)) {
175 sa_entry->enckey_len = 0;
180 ret = crypto_cipher_setkey(cipher, key, keylen);
182 sa_entry->enckey_len = 0;
185 memset(ghash_h, 0, AEAD_H_SIZE);
186 crypto_cipher_encrypt_one(cipher, ghash_h, ghash_h);
187 memcpy(sa_entry->key + (DIV_ROUND_UP(sa_entry->enckey_len, 16) *
188 16), ghash_h, AEAD_H_SIZE);
189 sa_entry->kctx_len = ((DIV_ROUND_UP(sa_entry->enckey_len, 16)) << 4) +
192 crypto_free_cipher(cipher);
198 * chcr_xfrm_add_state
199 * returns 0 on success, negative error if failed to send message to FPGA
200 * positive error if FPGA returned a bad response
202 static int chcr_xfrm_add_state(struct xfrm_state *x)
204 struct ipsec_sa_entry *sa_entry;
207 if (x->props.aalgo != SADB_AALG_NONE) {
208 pr_debug("CHCR: Cannot offload authenticated xfrm states\n");
211 if (x->props.calgo != SADB_X_CALG_NONE) {
212 pr_debug("CHCR: Cannot offload compressed xfrm states\n");
215 if (x->props.family != AF_INET &&
216 x->props.family != AF_INET6) {
217 pr_debug("CHCR: Only IPv4/6 xfrm state offloaded\n");
220 if (x->props.mode != XFRM_MODE_TRANSPORT &&
221 x->props.mode != XFRM_MODE_TUNNEL) {
222 pr_debug("CHCR: Only transport and tunnel xfrm offload\n");
225 if (x->id.proto != IPPROTO_ESP) {
226 pr_debug("CHCR: Only ESP xfrm state offloaded\n");
230 pr_debug("CHCR: Encapsulated xfrm state not offloaded\n");
234 pr_debug("CHCR: Cannot offload xfrm states without aead\n");
237 if (x->aead->alg_icv_len != 128 &&
238 x->aead->alg_icv_len != 96) {
239 pr_debug("CHCR: Cannot offload xfrm states with AEAD ICV length other than 96b & 128b\n");
242 if ((x->aead->alg_key_len != 128 + 32) &&
243 (x->aead->alg_key_len != 256 + 32)) {
244 pr_debug("CHCR: Cannot offload xfrm states with AEAD key length other than 128/256 bit\n");
248 pr_debug("CHCR: Cannot offload xfrm states with tfc padding\n");
252 pr_debug("CHCR: Cannot offload xfrm states without geniv\n");
255 if (strcmp(x->geniv, "seqiv")) {
256 pr_debug("CHCR: Cannot offload xfrm states with geniv other than seqiv\n");
260 sa_entry = kzalloc(sizeof(*sa_entry), GFP_KERNEL);
266 sa_entry->hmac_ctrl = chcr_ipsec_setauthsize(x, sa_entry);
267 if (x->props.flags & XFRM_STATE_ESN)
269 chcr_ipsec_setkey(x, sa_entry);
270 x->xso.offload_handle = (unsigned long)sa_entry;
271 try_module_get(THIS_MODULE);
276 static void chcr_xfrm_del_state(struct xfrm_state *x)
279 if (!x->xso.offload_handle)
283 static void chcr_xfrm_free_state(struct xfrm_state *x)
285 struct ipsec_sa_entry *sa_entry;
287 if (!x->xso.offload_handle)
290 sa_entry = (struct ipsec_sa_entry *)x->xso.offload_handle;
292 module_put(THIS_MODULE);
295 static bool chcr_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
297 if (x->props.family == AF_INET) {
298 /* Offload with IP options is not supported yet */
299 if (ip_hdr(skb)->ihl > 5)
302 /* Offload with IPv6 extension headers is not support yet */
303 if (ipv6_ext_hdr(ipv6_hdr(skb)->nexthdr))
306 /* Inline single pdu */
307 if (skb_shinfo(skb)->gso_size)
312 static void chcr_advance_esn_state(struct xfrm_state *x)
315 if (!x->xso.offload_handle)
319 static inline int is_eth_imm(const struct sk_buff *skb,
320 struct ipsec_sa_entry *sa_entry)
322 unsigned int kctx_len;
325 kctx_len = sa_entry->kctx_len;
326 hdrlen = sizeof(struct fw_ulptx_wr) +
327 sizeof(struct chcr_ipsec_req) + kctx_len;
329 hdrlen += sizeof(struct cpl_tx_pkt);
331 hdrlen += (DIV_ROUND_UP(sizeof(struct chcr_ipsec_aadiv), 16)
333 if (skb->len <= MAX_IMM_TX_PKT_LEN - hdrlen)
338 static inline unsigned int calc_tx_sec_flits(const struct sk_buff *skb,
339 struct ipsec_sa_entry *sa_entry,
342 unsigned int kctx_len;
347 kctx_len = sa_entry->kctx_len;
348 hdrlen = is_eth_imm(skb, sa_entry);
349 aadivlen = sa_entry->esn ? DIV_ROUND_UP(sizeof(struct chcr_ipsec_aadiv),
353 /* If the skb is small enough, we can pump it out as a work request
354 * with only immediate data. In that case we just have to have the
355 * TX Packet header plus the skb data in the Work Request.
360 return DIV_ROUND_UP(skb->len + hdrlen, sizeof(__be64));
363 flits = sgl_len(skb_shinfo(skb)->nr_frags + 1);
365 /* Otherwise, we're going to have to construct a Scatter gather list
366 * of the skb body and fragments. We also include the flits necessary
367 * for the TX Packet Work Request and CPL. We always have a firmware
368 * Write Header (incorporated as part of the cpl_tx_pkt_lso and
369 * cpl_tx_pkt structures), followed by either a TX Packet Write CPL
370 * message or, if we're doing a Large Send Offload, an LSO CPL message
371 * with an embedded TX Packet Write CPL message.
373 flits += (sizeof(struct fw_ulptx_wr) +
374 sizeof(struct chcr_ipsec_req) +
376 sizeof(struct cpl_tx_pkt_core) +
377 aadivlen) / sizeof(__be64);
381 inline void *copy_esn_pktxt(struct sk_buff *skb,
382 struct net_device *dev,
384 struct ipsec_sa_entry *sa_entry)
386 struct chcr_ipsec_aadiv *aadiv;
387 struct ulptx_idata *sc_imm;
388 struct ip_esp_hdr *esphdr;
389 struct xfrm_offload *xo;
390 struct sge_eth_txq *q;
391 struct adapter *adap;
392 struct port_info *pi;
400 pi = netdev_priv(dev);
402 qidx = skb->queue_mapping;
403 q = &adap->sge.ethtxq[qidx + pi->first_qset];
405 /* end of queue, reset pos to start of queue */
406 eoq = (void *)q->q.stat - pos;
410 len = DIV_ROUND_UP(sizeof(struct chcr_ipsec_aadiv), 16) << 4;
412 aadiv = (struct chcr_ipsec_aadiv *)pos;
413 esphdr = (struct ip_esp_hdr *)skb_transport_header(skb);
414 iv = skb_transport_header(skb) + sizeof(struct ip_esp_hdr);
415 xo = xfrm_offload(skb);
417 aadiv->spi = (esphdr->spi);
418 seqlo = htonl(esphdr->seq_no);
419 seqno = cpu_to_be64(seqlo + ((u64)xo->seq.hi << 32));
420 memcpy(aadiv->seq_no, &seqno, 8);
421 iv = skb_transport_header(skb) + sizeof(struct ip_esp_hdr);
422 memcpy(aadiv->iv, iv, 8);
424 if (is_eth_imm(skb, sa_entry) && !skb_is_nonlinear(skb)) {
425 sc_imm = (struct ulptx_idata *)(pos +
426 (DIV_ROUND_UP(sizeof(struct chcr_ipsec_aadiv),
427 sizeof(__be64)) << 3));
428 sc_imm->cmd_more = FILL_CMD_MORE(0);
429 sc_imm->len = cpu_to_be32(skb->len);
435 inline void *copy_cpltx_pktxt(struct sk_buff *skb,
436 struct net_device *dev,
438 struct ipsec_sa_entry *sa_entry)
440 struct cpl_tx_pkt_core *cpl;
441 struct sge_eth_txq *q;
442 struct adapter *adap;
443 struct port_info *pi;
448 pi = netdev_priv(dev);
450 qidx = skb->queue_mapping;
451 q = &adap->sge.ethtxq[qidx + pi->first_qset];
453 left = (void *)q->q.stat - pos;
457 cpl = (struct cpl_tx_pkt_core *)pos;
459 cntrl = TXPKT_L4CSUM_DIS_F | TXPKT_IPCSUM_DIS_F;
460 ctrl0 = TXPKT_OPCODE_V(CPL_TX_PKT_XT) | TXPKT_INTF_V(pi->tx_chan) |
461 TXPKT_PF_V(adap->pf);
462 if (skb_vlan_tag_present(skb)) {
464 cntrl |= TXPKT_VLAN_VLD_F | TXPKT_VLAN_V(skb_vlan_tag_get(skb));
467 cpl->ctrl0 = htonl(ctrl0);
468 cpl->pack = htons(0);
469 cpl->len = htons(skb->len);
470 cpl->ctrl1 = cpu_to_be64(cntrl);
472 pos += sizeof(struct cpl_tx_pkt_core);
473 /* Copy ESN info for HW */
475 pos = copy_esn_pktxt(skb, dev, pos, sa_entry);
479 inline void *copy_key_cpltx_pktxt(struct sk_buff *skb,
480 struct net_device *dev,
482 struct ipsec_sa_entry *sa_entry)
484 struct _key_ctx *key_ctx;
485 int left, eoq, key_len;
486 struct sge_eth_txq *q;
487 struct adapter *adap;
488 struct port_info *pi;
491 pi = netdev_priv(dev);
493 qidx = skb->queue_mapping;
494 q = &adap->sge.ethtxq[qidx + pi->first_qset];
495 key_len = sa_entry->kctx_len;
497 /* end of queue, reset pos to start of queue */
498 eoq = (void *)q->q.stat - pos;
502 left = 64 * q->q.size;
505 /* Copy the Key context header */
506 key_ctx = (struct _key_ctx *)pos;
507 key_ctx->ctx_hdr = sa_entry->key_ctx_hdr;
508 memcpy(key_ctx->salt, sa_entry->salt, MAX_SALT);
509 pos += sizeof(struct _key_ctx);
510 left -= sizeof(struct _key_ctx);
512 if (likely(key_len <= left)) {
513 memcpy(key_ctx->key, sa_entry->key, key_len);
516 memcpy(pos, sa_entry->key, left);
517 memcpy(q->q.desc, sa_entry->key + left,
519 pos = (u8 *)q->q.desc + (key_len - left);
521 /* Copy CPL TX PKT XT */
522 pos = copy_cpltx_pktxt(skb, dev, pos, sa_entry);
527 inline void *chcr_crypto_wreq(struct sk_buff *skb,
528 struct net_device *dev,
531 struct ipsec_sa_entry *sa_entry)
533 struct port_info *pi = netdev_priv(dev);
534 struct adapter *adap = pi->adapter;
535 unsigned int ivsize = GCM_ESP_IV_SIZE;
536 struct chcr_ipsec_wr *wr;
537 bool immediate = false;
549 int qidx = skb_get_queue_mapping(skb);
550 struct sge_eth_txq *q = &adap->sge.ethtxq[qidx + pi->first_qset];
551 unsigned int kctx_len = sa_entry->kctx_len;
552 int qid = q->q.cntxt_id;
554 atomic_inc(&adap->chcr_stats.ipsec_cnt);
556 flits = calc_tx_sec_flits(skb, sa_entry, &immediate);
557 ndesc = DIV_ROUND_UP(flits, 2);
562 immdatalen = skb->len;
565 esnlen = sizeof(struct chcr_ipsec_aadiv);
566 if (!skb_is_nonlinear(skb))
571 wr = (struct chcr_ipsec_wr *)pos;
572 wr->wreq.op_to_compl = htonl(FW_WR_OP_V(FW_ULPTX_WR));
573 wr_mid = FW_CRYPTO_LOOKASIDE_WR_LEN16_V(ndesc);
575 if (unlikely(credits < ETHTXQ_STOP_THRES)) {
576 netif_tx_stop_queue(q->txq);
578 wr_mid |= FW_WR_EQUEQ_F | FW_WR_EQUIQ_F;
580 wr_mid |= FW_ULPTX_WR_DATA_F;
581 wr->wreq.flowid_len16 = htonl(wr_mid);
584 wr->req.ulptx.cmd_dest = FILL_ULPTX_CMD_DEST(pi->port_id, qid);
585 wr->req.ulptx.len = htonl(ndesc - 1);
588 wr->req.sc_imm.cmd_more = FILL_CMD_MORE(!immdatalen || sc_more);
589 wr->req.sc_imm.len = cpu_to_be32(sizeof(struct cpl_tx_sec_pdu) +
590 sizeof(wr->req.key_ctx) +
592 sizeof(struct cpl_tx_pkt_core) +
594 (esnlen ? 0 : immdatalen));
597 ivinoffset = sa_entry->esn ? (ESN_IV_INSERT_OFFSET + 1) :
598 (skb_transport_offset(skb) +
599 sizeof(struct ip_esp_hdr) + 1);
600 wr->req.sec_cpl.op_ivinsrtofst = htonl(
601 CPL_TX_SEC_PDU_OPCODE_V(CPL_TX_SEC_PDU) |
602 CPL_TX_SEC_PDU_CPLLEN_V(2) |
603 CPL_TX_SEC_PDU_PLACEHOLDER_V(1) |
604 CPL_TX_SEC_PDU_IVINSRTOFST_V(
607 wr->req.sec_cpl.pldlen = htonl(skb->len + esnlen);
608 aadstart = sa_entry->esn ? 1 : (skb_transport_offset(skb) + 1);
609 aadstop = sa_entry->esn ? ESN_IV_INSERT_OFFSET :
610 (skb_transport_offset(skb) +
611 sizeof(struct ip_esp_hdr));
612 ciphstart = skb_transport_offset(skb) + sizeof(struct ip_esp_hdr) +
614 ciphstart += sa_entry->esn ? esnlen : 0;
616 wr->req.sec_cpl.aadstart_cipherstop_hi = FILL_SEC_CPL_CIPHERSTOP_HI(
621 wr->req.sec_cpl.cipherstop_lo_authinsert =
622 FILL_SEC_CPL_AUTHINSERT(0, ciphstart,
625 wr->req.sec_cpl.seqno_numivs =
626 FILL_SEC_CPL_SCMD0_SEQNO(CHCR_ENCRYPT_OP, 1,
627 CHCR_SCMD_CIPHER_MODE_AES_GCM,
628 CHCR_SCMD_AUTH_MODE_GHASH,
631 wr->req.sec_cpl.ivgen_hdrlen = FILL_SEC_CPL_IVGEN_HDRLEN(0, 0, 1,
634 pos += sizeof(struct fw_ulptx_wr) +
635 sizeof(struct ulp_txpkt) +
636 sizeof(struct ulptx_idata) +
637 sizeof(struct cpl_tx_sec_pdu);
639 pos = copy_key_cpltx_pktxt(skb, dev, pos, sa_entry);
645 * flits_to_desc - returns the num of Tx descriptors for the given flits
646 * @n: the number of flits
648 * Returns the number of Tx descriptors needed for the supplied number
651 static inline unsigned int flits_to_desc(unsigned int n)
653 WARN_ON(n > SGE_MAX_WR_LEN / 8);
654 return DIV_ROUND_UP(n, 8);
657 static inline unsigned int txq_avail(const struct sge_txq *q)
659 return q->size - 1 - q->in_use;
662 static void eth_txq_stop(struct sge_eth_txq *q)
664 netif_tx_stop_queue(q->txq);
668 static inline void txq_advance(struct sge_txq *q, unsigned int n)
672 if (q->pidx >= q->size)
677 * chcr_ipsec_xmit called from ULD Tx handler
679 int chcr_ipsec_xmit(struct sk_buff *skb, struct net_device *dev)
681 struct xfrm_state *x = xfrm_input_state(skb);
682 struct ipsec_sa_entry *sa_entry;
683 u64 *pos, *end, *before, *sgl;
684 int qidx, left, credits;
685 unsigned int flits = 0, ndesc;
686 struct adapter *adap;
687 struct sge_eth_txq *q;
688 struct port_info *pi;
689 dma_addr_t addr[MAX_SKB_FRAGS + 1];
691 bool immediate = false;
693 if (!x->xso.offload_handle)
694 return NETDEV_TX_BUSY;
696 sa_entry = (struct ipsec_sa_entry *)x->xso.offload_handle;
698 sp = skb_sec_path(skb);
700 out_free: dev_kfree_skb_any(skb);
704 pi = netdev_priv(dev);
706 qidx = skb->queue_mapping;
707 q = &adap->sge.ethtxq[qidx + pi->first_qset];
709 cxgb4_reclaim_completed_tx(adap, &q->q, true);
711 flits = calc_tx_sec_flits(skb, sa_entry, &immediate);
712 ndesc = flits_to_desc(flits);
713 credits = txq_avail(&q->q) - ndesc;
715 if (unlikely(credits < 0)) {
717 dev_err(adap->pdev_dev,
718 "%s: Tx ring %u full while queue awake! cred:%d %d %d flits:%d\n",
719 dev->name, qidx, credits, ndesc, txq_avail(&q->q),
721 return NETDEV_TX_BUSY;
725 unlikely(cxgb4_map_skb(adap->pdev_dev, skb, addr) < 0)) {
730 pos = (u64 *)&q->q.desc[q->q.pidx];
732 end = (u64 *)pos + flits;
733 /* Setup IPSec CPL */
734 pos = (void *)chcr_crypto_wreq(skb, dev, (void *)pos,
736 if (before > (u64 *)pos) {
737 left = (u8 *)end - (u8 *)q->q.stat;
738 end = (void *)q->q.desc + left;
740 if (pos == (u64 *)q->q.stat) {
741 left = (u8 *)end - (u8 *)q->q.stat;
742 end = (void *)q->q.desc + left;
743 pos = (void *)q->q.desc;
748 cxgb4_inline_tx_skb(skb, &q->q, sgl);
749 dev_consume_skb_any(skb);
753 cxgb4_write_sgl(skb, &q->q, (void *)sgl, end,
757 last_desc = q->q.pidx + ndesc - 1;
758 if (last_desc >= q->q.size)
759 last_desc -= q->q.size;
760 q->q.sdesc[last_desc].skb = skb;
761 q->q.sdesc[last_desc].sgl = (struct ulptx_sgl *)sgl;
763 txq_advance(&q->q, ndesc);
765 cxgb4_ring_tx_db(adap, &q->q, ndesc);