1 /* 2 * Copyright 2015 Amazon.com, Inc. or its affiliates. 3 * 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 8 * BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 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. 22 * 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 30 * SOFTWARE. 31 */ 32 33 #ifndef ENA_H 34 #define ENA_H 35 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> 42 43 #include "ena_com.h" 44 #include "ena_eth_com.h" 45 46 #define DRV_MODULE_VER_MAJOR 1 47 #define DRV_MODULE_VER_MINOR 1 48 #define DRV_MODULE_VER_SUBMINOR 7 49 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) 56 #endif 57 58 #define DEVICE_NAME "Elastic Network Adapter (ENA)" 59 60 /* 1 for AENQ + ADMIN */ 61 #define ENA_MAX_MSIX_VEC(io_queues) (1 + (io_queues)) 62 63 #define ENA_REG_BAR 0 64 #define ENA_MEM_BAR 2 65 #define ENA_BAR_MASK (BIT(ENA_REG_BAR) | BIT(ENA_MEM_BAR)) 66 67 #define ENA_DEFAULT_RING_SIZE (1024) 68 69 #define ENA_TX_WAKEUP_THRESH (MAX_SKB_FRAGS + 2) 70 #define ENA_DEFAULT_RX_COPYBREAK (128 - NET_IP_ALIGN) 71 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 75 */ 76 #define ENA_DEFAULT_MIN_RX_BUFF_ALLOC_SIZE 600 77 78 #define ENA_MIN_MTU 128 79 80 #define ENA_NAME_MAX_LEN 20 81 #define ENA_IRQNAME_SIZE 40 82 83 #define ENA_PKT_MAX_BUFS 19 84 85 #define ENA_RX_RSS_TABLE_LOG_SIZE 7 86 #define ENA_RX_RSS_TABLE_SIZE (1 << ENA_RX_RSS_TABLE_LOG_SIZE) 87 88 #define ENA_HASH_KEY_SIZE 40 89 90 /* The number of tx packet completions that will be handled each NAPI poll 91 * cycle is ring_size / ENA_TX_POLL_BUDGET_DIVIDER. 92 */ 93 #define ENA_TX_POLL_BUDGET_DIVIDER 4 94 95 /* Refill Rx queue when number of available descriptors is below 96 * QUEUE_SIZE / ENA_RX_REFILL_THRESH_DIVIDER 97 */ 98 #define ENA_RX_REFILL_THRESH_DIVIDER 8 99 100 /* 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 128 104 105 #define ENA_TX_RING_IDX_NEXT(idx, ring_size) (((idx) + 1) & ((ring_size) - 1)) 106 107 #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)) 110 111 #define ENA_IO_TXQ_IDX(q) (2 * (q)) 112 #define ENA_IO_RXQ_IDX(q) (2 * (q) + 1) 113 114 #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)) 117 118 /* ENA device should send keep alive msg every 1 sec. 119 * We wait for 6 sec just to be on the safe side. 120 */ 121 #define ENA_DEVICE_KALIVE_TIMEOUT (6 * HZ) 122 123 #define ENA_MMIO_DISABLE_REG_READ BIT(0) 124 125 struct ena_irq { 126 irq_handler_t handler; 127 void *data; 128 int cpu; 129 u32 vector; 130 cpumask_t affinity_hint_mask; 131 char name[ENA_IRQNAME_SIZE]; 132 }; 133 134 struct ena_napi { 135 struct napi_struct napi ____cacheline_aligned; 136 struct ena_ring *tx_ring; 137 struct ena_ring *rx_ring; 138 u32 qid; 139 }; 140 141 struct ena_tx_buffer { 142 struct sk_buff *skb; 143 /* num of ena desc for this specific skb 144 * (includes data desc and metadata desc) 145 */ 146 u32 tx_descs; 147 /* num of buffers used by this skb */ 148 u32 num_of_bufs; 149 150 /* Used for detect missing tx packets to limit the number of prints */ 151 u32 print_once; 152 /* Save the last jiffies to detect missing tx packets 153 * 154 * sets to non zero value on ena_start_xmit and set to zero on 155 * napi and timer_Service_routine. 156 * 157 * while this value is not protected by lock, 158 * a given packet is not expected to be handled by ena_start_xmit 159 * and by napi/timer_service at the same time. 160 */ 161 unsigned long last_jiffies; 162 struct ena_com_buf bufs[ENA_PKT_MAX_BUFS]; 163 } ____cacheline_aligned; 164 165 struct ena_rx_buffer { 166 struct sk_buff *skb; 167 struct page *page; 168 u32 page_offset; 169 struct ena_com_buf ena_buf; 170 } ____cacheline_aligned; 171 172 struct ena_stats_tx { 173 u64 cnt; 174 u64 bytes; 175 u64 queue_stop; 176 u64 prepare_ctx_err; 177 u64 queue_wakeup; 178 u64 dma_mapping_err; 179 u64 linearize; 180 u64 linearize_failed; 181 u64 napi_comp; 182 u64 tx_poll; 183 u64 doorbells; 184 u64 bad_req_id; 185 }; 186 187 struct ena_stats_rx { 188 u64 cnt; 189 u64 bytes; 190 u64 refil_partial; 191 u64 bad_csum; 192 u64 page_alloc_fail; 193 u64 skb_alloc_fail; 194 u64 dma_mapping_err; 195 u64 bad_desc_num; 196 u64 rx_copybreak_pkt; 197 u64 empty_rx_ring; 198 }; 199 200 struct ena_ring { 201 /* Holds the empty requests for TX out of order completions */ 202 u16 *free_tx_ids; 203 union { 204 struct ena_tx_buffer *tx_buffer_info; 205 struct ena_rx_buffer *rx_buffer_info; 206 }; 207 208 /* cache ptr to avoid using the adapter */ 209 struct device *dev; 210 struct pci_dev *pdev; 211 struct napi_struct *napi; 212 struct net_device *netdev; 213 struct ena_com_dev *ena_dev; 214 struct ena_adapter *adapter; 215 struct ena_com_io_cq *ena_com_io_cq; 216 struct ena_com_io_sq *ena_com_io_sq; 217 218 u16 next_to_use; 219 u16 next_to_clean; 220 u16 rx_copybreak; 221 u16 qid; 222 u16 mtu; 223 u16 sgl_size; 224 225 /* The maximum header length the device can handle */ 226 u8 tx_max_header_size; 227 228 /* cpu for TPH */ 229 int cpu; 230 /* number of tx/rx_buffer_info's entries */ 231 int ring_size; 232 233 enum ena_admin_placement_policy_type tx_mem_queue_type; 234 235 struct ena_com_rx_buf_info ena_bufs[ENA_PKT_MAX_BUFS]; 236 u32 smoothed_interval; 237 u32 per_napi_packets; 238 u32 per_napi_bytes; 239 enum ena_intr_moder_level moder_tbl_idx; 240 struct u64_stats_sync syncp; 241 union { 242 struct ena_stats_tx tx_stats; 243 struct ena_stats_rx rx_stats; 244 }; 245 int empty_rx_queue; 246 } ____cacheline_aligned; 247 248 struct ena_stats_dev { 249 u64 tx_timeout; 250 u64 io_suspend; 251 u64 io_resume; 252 u64 wd_expired; 253 u64 interface_up; 254 u64 interface_down; 255 u64 admin_q_pause; 256 u64 rx_drops; 257 }; 258 259 enum ena_flags_t { 260 ENA_FLAG_DEVICE_RUNNING, 261 ENA_FLAG_DEV_UP, 262 ENA_FLAG_LINK_UP, 263 ENA_FLAG_TRIGGER_RESET 264 }; 265 266 /* adapter specific private data structure */ 267 struct ena_adapter { 268 struct ena_com_dev *ena_dev; 269 /* OS defined structs */ 270 struct net_device *netdev; 271 struct pci_dev *pdev; 272 273 /* rx packets that shorter that this len will be copied to the skb 274 * header 275 */ 276 u32 rx_copybreak; 277 u32 max_mtu; 278 279 int num_queues; 280 281 int msix_vecs; 282 283 u32 tx_usecs, rx_usecs; /* interrupt moderation */ 284 u32 tx_frames, rx_frames; /* interrupt moderation */ 285 286 u32 tx_ring_size; 287 u32 rx_ring_size; 288 289 u32 msg_enable; 290 291 u16 max_tx_sgl_size; 292 u16 max_rx_sgl_size; 293 294 u8 mac_addr[ETH_ALEN]; 295 296 char name[ENA_NAME_MAX_LEN]; 297 298 unsigned long flags; 299 /* TX */ 300 struct ena_ring tx_ring[ENA_MAX_NUM_IO_QUEUES] 301 ____cacheline_aligned_in_smp; 302 303 /* RX */ 304 struct ena_ring rx_ring[ENA_MAX_NUM_IO_QUEUES] 305 ____cacheline_aligned_in_smp; 306 307 struct ena_napi ena_napi[ENA_MAX_NUM_IO_QUEUES]; 308 309 struct ena_irq irq_tbl[ENA_MAX_MSIX_VEC(ENA_MAX_NUM_IO_QUEUES)]; 310 311 /* timer service */ 312 struct work_struct reset_task; 313 struct work_struct suspend_io_task; 314 struct work_struct resume_io_task; 315 struct timer_list timer_service; 316 317 bool wd_state; 318 unsigned long last_keep_alive_jiffies; 319 320 struct u64_stats_sync syncp; 321 struct ena_stats_dev dev_stats; 322 323 /* last queue index that was checked for uncompleted tx packets */ 324 u32 last_monitored_tx_qid; 325 }; 326 327 void ena_set_ethtool_ops(struct net_device *netdev); 328 329 void ena_dump_stats_to_dmesg(struct ena_adapter *adapter); 330 331 void ena_dump_stats_to_buf(struct ena_adapter *adapter, u8 *buf); 332 333 int ena_get_sset_count(struct net_device *netdev, int sset); 334 335 #endif /* !(ENA_H) */ 336