2 * Copyright 2015 Amazon.com, Inc. or its affiliates.
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
36 #include <linux/bitops.h>
37 #include <linux/dim.h>
38 #include <linux/etherdevice.h>
39 #include <linux/if_vlan.h>
40 #include <linux/inetdevice.h>
41 #include <linux/interrupt.h>
42 #include <linux/netdevice.h>
43 #include <linux/skbuff.h>
46 #include "ena_eth_com.h"
48 #define DRV_MODULE_GEN_MAJOR 2
49 #define DRV_MODULE_GEN_MINOR 1
50 #define DRV_MODULE_GEN_SUBMINOR 0
52 #define DRV_MODULE_NAME "ena"
54 #define DEVICE_NAME "Elastic Network Adapter (ENA)"
56 /* 1 for AENQ + ADMIN */
57 #define ENA_ADMIN_MSIX_VEC 1
58 #define ENA_MAX_MSIX_VEC(io_queues) (ENA_ADMIN_MSIX_VEC + (io_queues))
60 /* The ENA buffer length fields is 16 bit long. So when PAGE_SIZE == 64kB the
62 * Since the max packet size the ENA handles is ~9kB limit the buffer length to
65 #if PAGE_SIZE > SZ_16K
66 #define ENA_PAGE_SIZE (_AC(SZ_16K, UL))
68 #define ENA_PAGE_SIZE PAGE_SIZE
71 #define ENA_MIN_MSIX_VEC 2
75 #define ENA_BAR_MASK (BIT(ENA_REG_BAR) | BIT(ENA_MEM_BAR))
77 #define ENA_DEFAULT_RING_SIZE (1024)
78 #define ENA_MIN_RING_SIZE (256)
80 #define ENA_MIN_NUM_IO_QUEUES (1)
82 #define ENA_TX_WAKEUP_THRESH (MAX_SKB_FRAGS + 2)
83 #define ENA_DEFAULT_RX_COPYBREAK (256 - NET_IP_ALIGN)
85 /* limit the buffer size to 600 bytes to handle MTU changes from very
86 * small to very large, in which case the number of buffers per packet
87 * could exceed ENA_PKT_MAX_BUFS
89 #define ENA_DEFAULT_MIN_RX_BUFF_ALLOC_SIZE 600
91 #define ENA_MIN_MTU 128
93 #define ENA_NAME_MAX_LEN 20
94 #define ENA_IRQNAME_SIZE 40
96 #define ENA_PKT_MAX_BUFS 19
98 #define ENA_RX_RSS_TABLE_LOG_SIZE 7
99 #define ENA_RX_RSS_TABLE_SIZE (1 << ENA_RX_RSS_TABLE_LOG_SIZE)
101 /* The number of tx packet completions that will be handled each NAPI poll
102 * cycle is ring_size / ENA_TX_POLL_BUDGET_DIVIDER.
104 #define ENA_TX_POLL_BUDGET_DIVIDER 4
106 /* Refill Rx queue when number of required descriptors is above
107 * QUEUE_SIZE / ENA_RX_REFILL_THRESH_DIVIDER or ENA_RX_REFILL_THRESH_PACKET
109 #define ENA_RX_REFILL_THRESH_DIVIDER 8
110 #define ENA_RX_REFILL_THRESH_PACKET 256
112 /* Number of queues to check for missing queues per timer service */
113 #define ENA_MONITORED_TX_QUEUES 4
114 /* Max timeout packets before device reset */
115 #define MAX_NUM_OF_TIMEOUTED_PACKETS 128
117 #define ENA_TX_RING_IDX_NEXT(idx, ring_size) (((idx) + 1) & ((ring_size) - 1))
119 #define ENA_RX_RING_IDX_NEXT(idx, ring_size) (((idx) + 1) & ((ring_size) - 1))
120 #define ENA_RX_RING_IDX_ADD(idx, n, ring_size) \
121 (((idx) + (n)) & ((ring_size) - 1))
123 #define ENA_IO_TXQ_IDX(q) (2 * (q))
124 #define ENA_IO_RXQ_IDX(q) (2 * (q) + 1)
125 #define ENA_IO_TXQ_IDX_TO_COMBINED_IDX(q) ((q) / 2)
126 #define ENA_IO_RXQ_IDX_TO_COMBINED_IDX(q) (((q) - 1) / 2)
128 #define ENA_MGMNT_IRQ_IDX 0
129 #define ENA_IO_IRQ_FIRST_IDX 1
130 #define ENA_IO_IRQ_IDX(q) (ENA_IO_IRQ_FIRST_IDX + (q))
132 #define ENA_ADMIN_POLL_DELAY_US 100
134 /* ENA device should send keep alive msg every 1 sec.
135 * We wait for 6 sec just to be on the safe side.
137 #define ENA_DEVICE_KALIVE_TIMEOUT (6 * HZ)
138 #define ENA_MAX_NO_INTERRUPT_ITERATIONS 3
140 #define ENA_MMIO_DISABLE_REG_READ BIT(0)
142 /* The max MTU size is configured to be the ethernet frame size without
143 * the overhead of the ethernet header, which can have a VLAN header, and
144 * a frame check sequence (FCS).
145 * The buffer size we share with the device is defined to be ENA_PAGE_SIZE
148 #define ENA_XDP_MAX_MTU (ENA_PAGE_SIZE - ETH_HLEN - ETH_FCS_LEN - \
149 VLAN_HLEN - XDP_PACKET_HEADROOM - \
150 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
152 #define ENA_IS_XDP_INDEX(adapter, index) (((index) >= (adapter)->xdp_first_ring) && \
153 ((index) < (adapter)->xdp_first_ring + (adapter)->xdp_num_queues))
156 irq_handler_t handler;
160 cpumask_t affinity_hint_mask;
161 char name[ENA_IRQNAME_SIZE];
165 struct napi_struct napi ____cacheline_aligned;
166 struct ena_ring *tx_ring;
167 struct ena_ring *rx_ring;
168 struct ena_ring *xdp_ring;
169 bool first_interrupt;
170 bool interrupts_masked;
175 struct ena_calc_queue_size_ctx {
176 struct ena_com_dev_get_features_ctx *get_feat_ctx;
177 struct ena_com_dev *ena_dev;
178 struct pci_dev *pdev;
181 u32 max_tx_queue_size;
182 u32 max_rx_queue_size;
187 struct ena_tx_buffer {
189 /* num of ena desc for this specific skb
190 * (includes data desc and metadata desc)
193 /* num of buffers used by this skb */
196 /* XDP buffer structure which is used for sending packets in
199 struct xdp_frame *xdpf;
200 /* The rx page for the rx buffer that was received in rx and
201 * re transmitted on xdp tx queues as a result of XDP_TX action.
202 * We need to free the page once we finished cleaning the buffer in
205 struct page *xdp_rx_page;
207 /* Indicate if bufs[0] map the linear data of the skb. */
210 /* Used for detect missing tx packets to limit the number of prints */
212 /* Save the last jiffies to detect missing tx packets
214 * sets to non zero value on ena_start_xmit and set to zero on
215 * napi and timer_Service_routine.
217 * while this value is not protected by lock,
218 * a given packet is not expected to be handled by ena_start_xmit
219 * and by napi/timer_service at the same time.
221 unsigned long last_jiffies;
222 struct ena_com_buf bufs[ENA_PKT_MAX_BUFS];
223 } ____cacheline_aligned;
225 struct ena_rx_buffer {
229 struct ena_com_buf ena_buf;
230 } ____cacheline_aligned;
232 struct ena_stats_tx {
240 u64 linearize_failed;
247 u64 unmask_interrupt;
250 struct ena_stats_rx {
253 u64 rx_copybreak_pkt;
267 /* Holds the empty requests for TX/RX
268 * out of order completions
273 struct ena_tx_buffer *tx_buffer_info;
274 struct ena_rx_buffer *rx_buffer_info;
277 /* cache ptr to avoid using the adapter */
279 struct pci_dev *pdev;
280 struct napi_struct *napi;
281 struct net_device *netdev;
282 struct ena_com_dev *ena_dev;
283 struct ena_adapter *adapter;
284 struct ena_com_io_cq *ena_com_io_cq;
285 struct ena_com_io_sq *ena_com_io_sq;
286 struct bpf_prog *xdp_bpf_prog;
287 struct xdp_rxq_info xdp_rxq;
297 /* The maximum header length the device can handle */
298 u8 tx_max_header_size;
300 bool first_interrupt;
301 bool disable_meta_caching;
302 u16 no_interrupt_event_cnt;
306 /* number of tx/rx_buffer_info's entries */
309 enum ena_admin_placement_policy_type tx_mem_queue_type;
311 struct ena_com_rx_buf_info ena_bufs[ENA_PKT_MAX_BUFS];
312 u32 smoothed_interval;
313 u32 per_napi_packets;
314 u16 non_empty_napi_events;
315 struct u64_stats_sync syncp;
317 struct ena_stats_tx tx_stats;
318 struct ena_stats_rx rx_stats;
321 u8 *push_buf_intermediate_buf;
323 } ____cacheline_aligned;
325 struct ena_stats_dev {
338 ENA_FLAG_DEVICE_RUNNING,
341 ENA_FLAG_MSIX_ENABLED,
342 ENA_FLAG_TRIGGER_RESET,
343 ENA_FLAG_ONGOING_RESET
346 /* adapter specific private data structure */
348 struct ena_com_dev *ena_dev;
349 /* OS defined structs */
350 struct net_device *netdev;
351 struct pci_dev *pdev;
353 /* rx packets that shorter that this len will be copied to the skb
360 u32 max_num_io_queues;
364 u32 missing_tx_completion_threshold;
366 u32 requested_tx_ring_size;
367 u32 requested_rx_ring_size;
369 u32 max_tx_ring_size;
370 u32 max_rx_ring_size;
377 u8 mac_addr[ETH_ALEN];
379 unsigned long keep_alive_timeout;
380 unsigned long missing_tx_completion_to;
382 char name[ENA_NAME_MAX_LEN];
386 struct ena_ring tx_ring[ENA_MAX_NUM_IO_QUEUES]
387 ____cacheline_aligned_in_smp;
390 struct ena_ring rx_ring[ENA_MAX_NUM_IO_QUEUES]
391 ____cacheline_aligned_in_smp;
393 struct ena_napi ena_napi[ENA_MAX_NUM_IO_QUEUES];
395 struct ena_irq irq_tbl[ENA_MAX_MSIX_VEC(ENA_MAX_NUM_IO_QUEUES)];
398 struct work_struct reset_task;
399 struct timer_list timer_service;
402 bool dev_up_before_reset;
403 bool disable_meta_caching;
404 unsigned long last_keep_alive_jiffies;
406 struct u64_stats_sync syncp;
407 struct ena_stats_dev dev_stats;
409 /* last queue index that was checked for uncompleted tx packets */
410 u32 last_monitored_tx_qid;
412 enum ena_regs_reset_reason_types reset_reason;
414 struct bpf_prog *xdp_bpf_prog;
419 void ena_set_ethtool_ops(struct net_device *netdev);
421 void ena_dump_stats_to_dmesg(struct ena_adapter *adapter);
423 void ena_dump_stats_to_buf(struct ena_adapter *adapter, u8 *buf);
425 int ena_update_queue_sizes(struct ena_adapter *adapter,
429 int ena_update_queue_count(struct ena_adapter *adapter, u32 new_channel_count);
431 int ena_get_sset_count(struct net_device *netdev, int sset);
433 enum ena_xdp_errors_t {
435 ENA_XDP_CURRENT_MTU_TOO_LARGE,
436 ENA_XDP_NO_ENOUGH_QUEUES,
439 static inline bool ena_xdp_queues_present(struct ena_adapter *adapter)
441 return adapter->xdp_first_ring != 0;
444 static inline bool ena_xdp_present(struct ena_adapter *adapter)
446 return !!adapter->xdp_bpf_prog;
449 static inline bool ena_xdp_present_ring(struct ena_ring *ring)
451 return !!ring->xdp_bpf_prog;
454 static inline int ena_xdp_legal_queue_count(struct ena_adapter *adapter,
457 return 2 * queues <= adapter->max_num_io_queues;
460 static inline enum ena_xdp_errors_t ena_xdp_allowed(struct ena_adapter *adapter)
462 enum ena_xdp_errors_t rc = ENA_XDP_ALLOWED;
464 if (adapter->netdev->mtu > ENA_XDP_MAX_MTU)
465 rc = ENA_XDP_CURRENT_MTU_TOO_LARGE;
466 else if (!ena_xdp_legal_queue_count(adapter, adapter->num_io_queues))
467 rc = ENA_XDP_NO_ENOUGH_QUEUES;
472 #endif /* !(ENA_H) */