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
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
36 #include <linux/bitops.h>
37 #include <linux/etherdevice.h>
38 #include <linux/inetdevice.h>
39 #include <linux/interrupt.h>
40 #include <linux/netdevice.h>
41 #include <linux/skbuff.h>
44 #include "ena_eth_com.h"
46 #define DRV_MODULE_VER_MAJOR 2
47 #define DRV_MODULE_VER_MINOR 0
48 #define DRV_MODULE_VER_SUBMINOR 2
50 #define DRV_MODULE_NAME "ena"
51 #ifndef DRV_MODULE_VERSION
52 #define DRV_MODULE_VERSION \
53 __stringify(DRV_MODULE_VER_MAJOR) "." \
54 __stringify(DRV_MODULE_VER_MINOR) "." \
55 __stringify(DRV_MODULE_VER_SUBMINOR) "K"
58 #define DEVICE_NAME "Elastic Network Adapter (ENA)"
60 /* 1 for AENQ + ADMIN */
61 #define ENA_ADMIN_MSIX_VEC 1
62 #define ENA_MAX_MSIX_VEC(io_queues) (ENA_ADMIN_MSIX_VEC + (io_queues))
64 /* The ENA buffer length fields is 16 bit long. So when PAGE_SIZE == 64kB the
66 * Since the max packet size the ENA handles is ~9kB limit the buffer length to
69 #if PAGE_SIZE > SZ_16K
70 #define ENA_PAGE_SIZE SZ_16K
72 #define ENA_PAGE_SIZE PAGE_SIZE
75 #define ENA_MIN_MSIX_VEC 2
79 #define ENA_BAR_MASK (BIT(ENA_REG_BAR) | BIT(ENA_MEM_BAR))
81 #define ENA_DEFAULT_RING_SIZE (1024)
83 #define ENA_TX_WAKEUP_THRESH (MAX_SKB_FRAGS + 2)
84 #define ENA_DEFAULT_RX_COPYBREAK (256 - NET_IP_ALIGN)
86 /* limit the buffer size to 600 bytes to handle MTU changes from very
87 * small to very large, in which case the number of buffers per packet
88 * could exceed ENA_PKT_MAX_BUFS
90 #define ENA_DEFAULT_MIN_RX_BUFF_ALLOC_SIZE 600
92 #define ENA_MIN_MTU 128
94 #define ENA_NAME_MAX_LEN 20
95 #define ENA_IRQNAME_SIZE 40
97 #define ENA_PKT_MAX_BUFS 19
99 #define ENA_RX_RSS_TABLE_LOG_SIZE 7
100 #define ENA_RX_RSS_TABLE_SIZE (1 << ENA_RX_RSS_TABLE_LOG_SIZE)
102 #define ENA_HASH_KEY_SIZE 40
104 /* The number of tx packet completions that will be handled each NAPI poll
105 * cycle is ring_size / ENA_TX_POLL_BUDGET_DIVIDER.
107 #define ENA_TX_POLL_BUDGET_DIVIDER 4
109 /* Refill Rx queue when number of required descriptors is above
110 * QUEUE_SIZE / ENA_RX_REFILL_THRESH_DIVIDER or ENA_RX_REFILL_THRESH_PACKET
112 #define ENA_RX_REFILL_THRESH_DIVIDER 8
113 #define ENA_RX_REFILL_THRESH_PACKET 256
115 /* Number of queues to check for missing queues per timer service */
116 #define ENA_MONITORED_TX_QUEUES 4
117 /* Max timeout packets before device reset */
118 #define MAX_NUM_OF_TIMEOUTED_PACKETS 128
120 #define ENA_TX_RING_IDX_NEXT(idx, ring_size) (((idx) + 1) & ((ring_size) - 1))
122 #define ENA_RX_RING_IDX_NEXT(idx, ring_size) (((idx) + 1) & ((ring_size) - 1))
123 #define ENA_RX_RING_IDX_ADD(idx, n, ring_size) \
124 (((idx) + (n)) & ((ring_size) - 1))
126 #define ENA_IO_TXQ_IDX(q) (2 * (q))
127 #define ENA_IO_RXQ_IDX(q) (2 * (q) + 1)
129 #define ENA_MGMNT_IRQ_IDX 0
130 #define ENA_IO_IRQ_FIRST_IDX 1
131 #define ENA_IO_IRQ_IDX(q) (ENA_IO_IRQ_FIRST_IDX + (q))
133 /* ENA device should send keep alive msg every 1 sec.
134 * We wait for 6 sec just to be on the safe side.
136 #define ENA_DEVICE_KALIVE_TIMEOUT (6 * HZ)
137 #define ENA_MAX_NO_INTERRUPT_ITERATIONS 3
139 #define ENA_MMIO_DISABLE_REG_READ BIT(0)
142 irq_handler_t handler;
146 cpumask_t affinity_hint_mask;
147 char name[ENA_IRQNAME_SIZE];
151 struct napi_struct napi ____cacheline_aligned;
152 struct ena_ring *tx_ring;
153 struct ena_ring *rx_ring;
157 struct ena_tx_buffer {
159 /* num of ena desc for this specific skb
160 * (includes data desc and metadata desc)
163 /* num of buffers used by this skb */
166 /* Indicate if bufs[0] map the linear data of the skb. */
169 /* Used for detect missing tx packets to limit the number of prints */
171 /* Save the last jiffies to detect missing tx packets
173 * sets to non zero value on ena_start_xmit and set to zero on
174 * napi and timer_Service_routine.
176 * while this value is not protected by lock,
177 * a given packet is not expected to be handled by ena_start_xmit
178 * and by napi/timer_service at the same time.
180 unsigned long last_jiffies;
181 struct ena_com_buf bufs[ENA_PKT_MAX_BUFS];
182 } ____cacheline_aligned;
184 struct ena_rx_buffer {
188 struct ena_com_buf ena_buf;
189 } ____cacheline_aligned;
191 struct ena_stats_tx {
199 u64 linearize_failed;
208 struct ena_stats_rx {
217 u64 rx_copybreak_pkt;
225 /* Holds the empty requests for TX/RX
226 * out of order completions
233 struct ena_tx_buffer *tx_buffer_info;
234 struct ena_rx_buffer *rx_buffer_info;
237 /* cache ptr to avoid using the adapter */
239 struct pci_dev *pdev;
240 struct napi_struct *napi;
241 struct net_device *netdev;
242 struct ena_com_dev *ena_dev;
243 struct ena_adapter *adapter;
244 struct ena_com_io_cq *ena_com_io_cq;
245 struct ena_com_io_sq *ena_com_io_sq;
254 /* The maximum header length the device can handle */
255 u8 tx_max_header_size;
257 bool first_interrupt;
258 u16 no_interrupt_event_cnt;
262 /* number of tx/rx_buffer_info's entries */
265 enum ena_admin_placement_policy_type tx_mem_queue_type;
267 struct ena_com_rx_buf_info ena_bufs[ENA_PKT_MAX_BUFS];
268 u32 smoothed_interval;
269 u32 per_napi_packets;
271 enum ena_intr_moder_level moder_tbl_idx;
272 struct u64_stats_sync syncp;
274 struct ena_stats_tx tx_stats;
275 struct ena_stats_rx rx_stats;
278 u8 *push_buf_intermediate_buf;
280 } ____cacheline_aligned;
282 struct ena_stats_dev {
294 ENA_FLAG_DEVICE_RUNNING,
297 ENA_FLAG_MSIX_ENABLED,
298 ENA_FLAG_TRIGGER_RESET,
299 ENA_FLAG_ONGOING_RESET
302 /* adapter specific private data structure */
304 struct ena_com_dev *ena_dev;
305 /* OS defined structs */
306 struct net_device *netdev;
307 struct pci_dev *pdev;
309 /* rx packets that shorter that this len will be copied to the skb
319 u32 missing_tx_completion_threshold;
321 u32 tx_usecs, rx_usecs; /* interrupt moderation */
322 u32 tx_frames, rx_frames; /* interrupt moderation */
332 u8 mac_addr[ETH_ALEN];
334 unsigned long keep_alive_timeout;
335 unsigned long missing_tx_completion_to;
337 char name[ENA_NAME_MAX_LEN];
341 struct ena_ring tx_ring[ENA_MAX_NUM_IO_QUEUES]
342 ____cacheline_aligned_in_smp;
345 struct ena_ring rx_ring[ENA_MAX_NUM_IO_QUEUES]
346 ____cacheline_aligned_in_smp;
348 struct ena_napi ena_napi[ENA_MAX_NUM_IO_QUEUES];
350 struct ena_irq irq_tbl[ENA_MAX_MSIX_VEC(ENA_MAX_NUM_IO_QUEUES)];
353 struct work_struct reset_task;
354 struct timer_list timer_service;
357 bool dev_up_before_reset;
358 unsigned long last_keep_alive_jiffies;
360 struct u64_stats_sync syncp;
361 struct ena_stats_dev dev_stats;
363 /* last queue index that was checked for uncompleted tx packets */
364 u32 last_monitored_tx_qid;
366 enum ena_regs_reset_reason_types reset_reason;
369 void ena_set_ethtool_ops(struct net_device *netdev);
371 void ena_dump_stats_to_dmesg(struct ena_adapter *adapter);
373 void ena_dump_stats_to_buf(struct ena_adapter *adapter, u8 *buf);
375 int ena_get_sset_count(struct net_device *netdev, int sset);
377 #endif /* !(ENA_H) */