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 1
47 #define DRV_MODULE_VER_MINOR 1
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)
58 #define DEVICE_NAME "Elastic Network Adapter (ENA)"
60 /* 1 for AENQ + ADMIN */
61 #define ENA_MAX_MSIX_VEC(io_queues) (1 + (io_queues))
65 #define ENA_BAR_MASK (BIT(ENA_REG_BAR) | BIT(ENA_MEM_BAR))
67 #define ENA_DEFAULT_RING_SIZE (1024)
69 #define ENA_TX_WAKEUP_THRESH (MAX_SKB_FRAGS + 2)
70 #define ENA_DEFAULT_RX_COPYBREAK (128 - NET_IP_ALIGN)
72 /* limit the buffer size to 600 bytes to handle MTU changes from very
73 * small to very large, in which case the number of buffers per packet
74 * could exceed ENA_PKT_MAX_BUFS
76 #define ENA_DEFAULT_MIN_RX_BUFF_ALLOC_SIZE 600
78 #define ENA_MIN_MTU 128
80 #define ENA_NAME_MAX_LEN 20
81 #define ENA_IRQNAME_SIZE 40
83 #define ENA_PKT_MAX_BUFS 19
85 #define ENA_RX_RSS_TABLE_LOG_SIZE 7
86 #define ENA_RX_RSS_TABLE_SIZE (1 << ENA_RX_RSS_TABLE_LOG_SIZE)
88 #define ENA_HASH_KEY_SIZE 40
90 /* The number of tx packet completions that will be handled each NAPI poll
91 * cycle is ring_size / ENA_TX_POLL_BUDGET_DIVIDER.
93 #define ENA_TX_POLL_BUDGET_DIVIDER 4
95 /* Refill Rx queue when number of available descriptors is below
96 * QUEUE_SIZE / ENA_RX_REFILL_THRESH_DIVIDER
98 #define ENA_RX_REFILL_THRESH_DIVIDER 8
100 /* Number of queues to check for missing queues per timer service */
101 #define ENA_MONITORED_TX_QUEUES 4
102 /* Max timeout packets before device reset */
103 #define MAX_NUM_OF_TIMEOUTED_PACKETS 128
105 #define ENA_TX_RING_IDX_NEXT(idx, ring_size) (((idx) + 1) & ((ring_size) - 1))
107 #define ENA_RX_RING_IDX_NEXT(idx, ring_size) (((idx) + 1) & ((ring_size) - 1))
108 #define ENA_RX_RING_IDX_ADD(idx, n, ring_size) \
109 (((idx) + (n)) & ((ring_size) - 1))
111 #define ENA_IO_TXQ_IDX(q) (2 * (q))
112 #define ENA_IO_RXQ_IDX(q) (2 * (q) + 1)
114 #define ENA_MGMNT_IRQ_IDX 0
115 #define ENA_IO_IRQ_FIRST_IDX 1
116 #define ENA_IO_IRQ_IDX(q) (ENA_IO_IRQ_FIRST_IDX + (q))
118 /* ENA device should send keep alive msg every 1 sec.
119 * We wait for 6 sec just to be on the safe side.
121 #define ENA_DEVICE_KALIVE_TIMEOUT (6 * HZ)
123 #define ENA_MMIO_DISABLE_REG_READ BIT(0)
126 irq_handler_t handler;
130 cpumask_t affinity_hint_mask;
131 char name[ENA_IRQNAME_SIZE];
135 struct napi_struct napi ____cacheline_aligned;
136 struct ena_ring *tx_ring;
137 struct ena_ring *rx_ring;
141 struct ena_tx_buffer {
143 /* num of ena desc for this specific skb
144 * (includes data desc and metadata desc)
147 /* num of buffers used by this skb */
149 /* Save the last jiffies to detect missing tx packets */
150 unsigned long last_jiffies;
151 struct ena_com_buf bufs[ENA_PKT_MAX_BUFS];
152 } ____cacheline_aligned;
154 struct ena_rx_buffer {
158 struct ena_com_buf ena_buf;
159 } ____cacheline_aligned;
161 struct ena_stats_tx {
169 u64 linearize_failed;
177 struct ena_stats_rx {
186 u64 rx_copybreak_pkt;
190 /* Holds the empty requests for TX out of order completions */
193 struct ena_tx_buffer *tx_buffer_info;
194 struct ena_rx_buffer *rx_buffer_info;
197 /* cache ptr to avoid using the adapter */
199 struct pci_dev *pdev;
200 struct napi_struct *napi;
201 struct net_device *netdev;
202 struct ena_com_dev *ena_dev;
203 struct ena_adapter *adapter;
204 struct ena_com_io_cq *ena_com_io_cq;
205 struct ena_com_io_sq *ena_com_io_sq;
214 /* The maximum header length the device can handle */
215 u8 tx_max_header_size;
219 /* number of tx/rx_buffer_info's entries */
222 enum ena_admin_placement_policy_type tx_mem_queue_type;
224 struct ena_com_rx_buf_info ena_bufs[ENA_PKT_MAX_BUFS];
225 u32 smoothed_interval;
226 u32 per_napi_packets;
228 enum ena_intr_moder_level moder_tbl_idx;
229 struct u64_stats_sync syncp;
231 struct ena_stats_tx tx_stats;
232 struct ena_stats_rx rx_stats;
234 } ____cacheline_aligned;
236 struct ena_stats_dev {
248 ENA_FLAG_DEVICE_RUNNING,
251 ENA_FLAG_TRIGGER_RESET
254 /* adapter specific private data structure */
256 struct ena_com_dev *ena_dev;
257 /* OS defined structs */
258 struct net_device *netdev;
259 struct pci_dev *pdev;
261 /* rx packets that shorter that this len will be copied to the skb
271 u32 tx_usecs, rx_usecs; /* interrupt moderation */
272 u32 tx_frames, rx_frames; /* interrupt moderation */
282 u8 mac_addr[ETH_ALEN];
284 char name[ENA_NAME_MAX_LEN];
288 struct ena_ring tx_ring[ENA_MAX_NUM_IO_QUEUES]
289 ____cacheline_aligned_in_smp;
292 struct ena_ring rx_ring[ENA_MAX_NUM_IO_QUEUES]
293 ____cacheline_aligned_in_smp;
295 struct ena_napi ena_napi[ENA_MAX_NUM_IO_QUEUES];
297 struct ena_irq irq_tbl[ENA_MAX_MSIX_VEC(ENA_MAX_NUM_IO_QUEUES)];
300 struct work_struct reset_task;
301 struct work_struct suspend_io_task;
302 struct work_struct resume_io_task;
303 struct timer_list timer_service;
306 unsigned long last_keep_alive_jiffies;
308 struct u64_stats_sync syncp;
309 struct ena_stats_dev dev_stats;
311 /* last queue index that was checked for uncompleted tx packets */
312 u32 last_monitored_tx_qid;
315 void ena_set_ethtool_ops(struct net_device *netdev);
317 void ena_dump_stats_to_dmesg(struct ena_adapter *adapter);
319 void ena_dump_stats_to_buf(struct ena_adapter *adapter, u8 *buf);
321 int ena_get_sset_count(struct net_device *netdev, int sset);
323 #endif /* !(ENA_H) */