drivers/net/ethernet/amazon/ena/ena_netdev.h

   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 2
  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         /* 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;
 153
 154 struct ena_rx_buffer {
 155         struct sk_buff *skb;
 156         struct page *page;
 157         u32 page_offset;
 158         struct ena_com_buf ena_buf;
 159 } ____cacheline_aligned;
 160
 161 struct ena_stats_tx {
 162         u64 cnt;
 163         u64 bytes;
 164         u64 queue_stop;
 165         u64 prepare_ctx_err;
 166         u64 queue_wakeup;
 167         u64 dma_mapping_err;
 168         u64 linearize;
 169         u64 linearize_failed;
 170         u64 napi_comp;
 171         u64 tx_poll;
 172         u64 doorbells;
 173         u64 missing_tx_comp;
 174         u64 bad_req_id;
 175 };
 176
 177 struct ena_stats_rx {
 178         u64 cnt;
 179         u64 bytes;
 180         u64 refil_partial;
 181         u64 bad_csum;
 182         u64 page_alloc_fail;
 183         u64 skb_alloc_fail;
 184         u64 dma_mapping_err;
 185         u64 bad_desc_num;
 186         u64 rx_copybreak_pkt;
 187         u64 empty_rx_ring;
 188 };
 189
 190 struct ena_ring {
 191         /* Holds the empty requests for TX out of order completions */
 192         u16 *free_tx_ids;
 193         union {
 194                 struct ena_tx_buffer *tx_buffer_info;
 195                 struct ena_rx_buffer *rx_buffer_info;
 196         };
 197
 198         /* cache ptr to avoid using the adapter */
 199         struct device *dev;
 200         struct pci_dev *pdev;
 201         struct napi_struct *napi;
 202         struct net_device *netdev;
 203         struct ena_com_dev *ena_dev;
 204         struct ena_adapter *adapter;
 205         struct ena_com_io_cq *ena_com_io_cq;
 206         struct ena_com_io_sq *ena_com_io_sq;
 207
 208         u16 next_to_use;
 209         u16 next_to_clean;
 210         u16 rx_copybreak;
 211         u16 qid;
 212         u16 mtu;
 213         u16 sgl_size;
 214
 215         /* The maximum header length the device can handle */
 216         u8 tx_max_header_size;
 217
 218         /* cpu for TPH */
 219         int cpu;
 220          /* number of tx/rx_buffer_info's entries */
 221         int ring_size;
 222
 223         enum ena_admin_placement_policy_type tx_mem_queue_type;
 224
 225         struct ena_com_rx_buf_info ena_bufs[ENA_PKT_MAX_BUFS];
 226         u32  smoothed_interval;
 227         u32  per_napi_packets;
 228         u32  per_napi_bytes;
 229         enum ena_intr_moder_level moder_tbl_idx;
 230         struct u64_stats_sync syncp;
 231         union {
 232                 struct ena_stats_tx tx_stats;
 233                 struct ena_stats_rx rx_stats;
 234         };
 235         int empty_rx_queue;
 236 } ____cacheline_aligned;
 237
 238 struct ena_stats_dev {
 239         u64 tx_timeout;
 240         u64 io_suspend;
 241         u64 io_resume;
 242         u64 wd_expired;
 243         u64 interface_up;
 244         u64 interface_down;
 245         u64 admin_q_pause;
 246         u64 rx_drops;
 247 };
 248
 249 enum ena_flags_t {
 250         ENA_FLAG_DEVICE_RUNNING,
 251         ENA_FLAG_DEV_UP,
 252         ENA_FLAG_LINK_UP,
 253         ENA_FLAG_TRIGGER_RESET
 254 };
 255
 256 /* adapter specific private data structure */
 257 struct ena_adapter {
 258         struct ena_com_dev *ena_dev;
 259         /* OS defined structs */
 260         struct net_device *netdev;
 261         struct pci_dev *pdev;
 262
 263         /* rx packets that shorter that this len will be copied to the skb
 264          * header
 265          */
 266         u32 rx_copybreak;
 267         u32 max_mtu;
 268
 269         int num_queues;
 270
 271         int msix_vecs;
 272
 273         u32 tx_usecs, rx_usecs; /* interrupt moderation */
 274         u32 tx_frames, rx_frames; /* interrupt moderation */
 275
 276         u32 tx_ring_size;
 277         u32 rx_ring_size;
 278
 279         u32 msg_enable;
 280
 281         u16 max_tx_sgl_size;
 282         u16 max_rx_sgl_size;
 283
 284         u8 mac_addr[ETH_ALEN];
 285
 286         char name[ENA_NAME_MAX_LEN];
 287
 288         unsigned long flags;
 289         /* TX */
 290         struct ena_ring tx_ring[ENA_MAX_NUM_IO_QUEUES]
 291                 ____cacheline_aligned_in_smp;
 292
 293         /* RX */
 294         struct ena_ring rx_ring[ENA_MAX_NUM_IO_QUEUES]
 295                 ____cacheline_aligned_in_smp;
 296
 297         struct ena_napi ena_napi[ENA_MAX_NUM_IO_QUEUES];
 298
 299         struct ena_irq irq_tbl[ENA_MAX_MSIX_VEC(ENA_MAX_NUM_IO_QUEUES)];
 300
 301         /* timer service */
 302         struct work_struct reset_task;
 303         struct work_struct suspend_io_task;
 304         struct work_struct resume_io_task;
 305         struct timer_list timer_service;
 306
 307         bool wd_state;
 308         unsigned long last_keep_alive_jiffies;
 309
 310         struct u64_stats_sync syncp;
 311         struct ena_stats_dev dev_stats;
 312
 313         /* last queue index that was checked for uncompleted tx packets */
 314         u32 last_monitored_tx_qid;
 315 };
 316
 317 void ena_set_ethtool_ops(struct net_device *netdev);
 318
 319 void ena_dump_stats_to_dmesg(struct ena_adapter *adapter);
 320
 321 void ena_dump_stats_to_buf(struct ena_adapter *adapter, u8 *buf);
 322
 323 int ena_get_sset_count(struct net_device *netdev, int sset);
 324
 325 #endif /* !(ENA_H) */