drivers/net/ethernet/sfc/mcdi_functions.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /****************************************************************************
   3  * Driver for Solarflare network controllers and boards
   4  * Copyright 2019 Solarflare Communications Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published
   8  * by the Free Software Foundation, incorporated herein by reference.
   9  */
  10
  11 #include "net_driver.h"
  12 #include "efx.h"
  13 #include "nic.h"
  14 #include "mcdi_functions.h"
  15 #include "mcdi.h"
  16 #include "mcdi_pcol.h"
  17
  18 int efx_mcdi_free_vis(struct efx_nic *efx)
  19 {
  20         MCDI_DECLARE_BUF_ERR(outbuf);
  21         size_t outlen;
  22         int rc = efx_mcdi_rpc_quiet(efx, MC_CMD_FREE_VIS, NULL, 0,
  23                                     outbuf, sizeof(outbuf), &outlen);
  24
  25         /* -EALREADY means nothing to free, so ignore */
  26         if (rc == -EALREADY)
  27                 rc = 0;
  28         if (rc)
  29                 efx_mcdi_display_error(efx, MC_CMD_FREE_VIS, 0, outbuf, outlen,
  30                                        rc);
  31         return rc;
  32 }
  33
  34 int efx_mcdi_alloc_vis(struct efx_nic *efx, unsigned int min_vis,
  35                        unsigned int max_vis, unsigned int *vi_base,
  36                        unsigned int *allocated_vis)
  37 {
  38         MCDI_DECLARE_BUF(outbuf, MC_CMD_ALLOC_VIS_OUT_LEN);
  39         MCDI_DECLARE_BUF(inbuf, MC_CMD_ALLOC_VIS_IN_LEN);
  40         size_t outlen;
  41         int rc;
  42
  43         MCDI_SET_DWORD(inbuf, ALLOC_VIS_IN_MIN_VI_COUNT, min_vis);
  44         MCDI_SET_DWORD(inbuf, ALLOC_VIS_IN_MAX_VI_COUNT, max_vis);
  45         rc = efx_mcdi_rpc(efx, MC_CMD_ALLOC_VIS, inbuf, sizeof(inbuf),
  46                           outbuf, sizeof(outbuf), &outlen);
  47         if (rc != 0)
  48                 return rc;
  49
  50         if (outlen < MC_CMD_ALLOC_VIS_OUT_LEN)
  51                 return -EIO;
  52
  53         netif_dbg(efx, drv, efx->net_dev, "base VI is A0x%03x\n",
  54                   MCDI_DWORD(outbuf, ALLOC_VIS_OUT_VI_BASE));
  55
  56         if (vi_base)
  57                 *vi_base = MCDI_DWORD(outbuf, ALLOC_VIS_OUT_VI_BASE);
  58         if (allocated_vis)
  59                 *allocated_vis = MCDI_DWORD(outbuf, ALLOC_VIS_OUT_VI_COUNT);
  60         return 0;
  61 }
  62
  63 int efx_mcdi_ev_probe(struct efx_channel *channel)
  64 {
  65         return efx_nic_alloc_buffer(channel->efx, &channel->eventq.buf,
  66                                     (channel->eventq_mask + 1) *
  67                                     sizeof(efx_qword_t),
  68                                     GFP_KERNEL);
  69 }
  70
  71 int efx_mcdi_ev_init(struct efx_channel *channel, bool v1_cut_thru, bool v2)
  72 {
  73         MCDI_DECLARE_BUF(inbuf,
  74                          MC_CMD_INIT_EVQ_V2_IN_LEN(EFX_MAX_EVQ_SIZE * 8 /
  75                                                    EFX_BUF_SIZE));
  76         MCDI_DECLARE_BUF(outbuf, MC_CMD_INIT_EVQ_V2_OUT_LEN);
  77         size_t entries = channel->eventq.buf.len / EFX_BUF_SIZE;
  78         struct efx_nic *efx = channel->efx;
  79         size_t inlen, outlen;
  80         dma_addr_t dma_addr;
  81         int rc, i;
  82
  83         /* Fill event queue with all ones (i.e. empty events) */
  84         memset(channel->eventq.buf.addr, 0xff, channel->eventq.buf.len);
  85
  86         MCDI_SET_DWORD(inbuf, INIT_EVQ_IN_SIZE, channel->eventq_mask + 1);
  87         MCDI_SET_DWORD(inbuf, INIT_EVQ_IN_INSTANCE, channel->channel);
  88         /* INIT_EVQ expects index in vector table, not absolute */
  89         MCDI_SET_DWORD(inbuf, INIT_EVQ_IN_IRQ_NUM, channel->channel);
  90         MCDI_SET_DWORD(inbuf, INIT_EVQ_IN_TMR_MODE,
  91                        MC_CMD_INIT_EVQ_IN_TMR_MODE_DIS);
  92         MCDI_SET_DWORD(inbuf, INIT_EVQ_IN_TMR_LOAD, 0);
  93         MCDI_SET_DWORD(inbuf, INIT_EVQ_IN_TMR_RELOAD, 0);
  94         MCDI_SET_DWORD(inbuf, INIT_EVQ_IN_COUNT_MODE,
  95                        MC_CMD_INIT_EVQ_IN_COUNT_MODE_DIS);
  96         MCDI_SET_DWORD(inbuf, INIT_EVQ_IN_COUNT_THRSHLD, 0);
  97
  98         if (v2) {
  99                 /* Use the new generic approach to specifying event queue
 100                  * configuration, requesting lower latency or higher throughput.
 101                  * The options that actually get used appear in the output.
 102                  */
 103                 MCDI_POPULATE_DWORD_2(inbuf, INIT_EVQ_V2_IN_FLAGS,
 104                                       INIT_EVQ_V2_IN_FLAG_INTERRUPTING, 1,
 105                                       INIT_EVQ_V2_IN_FLAG_TYPE,
 106                                       MC_CMD_INIT_EVQ_V2_IN_FLAG_TYPE_AUTO);
 107         } else {
 108                 MCDI_POPULATE_DWORD_4(inbuf, INIT_EVQ_IN_FLAGS,
 109                                       INIT_EVQ_IN_FLAG_INTERRUPTING, 1,
 110                                       INIT_EVQ_IN_FLAG_RX_MERGE, 1,
 111                                       INIT_EVQ_IN_FLAG_TX_MERGE, 1,
 112                                       INIT_EVQ_IN_FLAG_CUT_THRU, v1_cut_thru);
 113         }
 114
 115         dma_addr = channel->eventq.buf.dma_addr;
 116         for (i = 0; i < entries; ++i) {
 117                 MCDI_SET_ARRAY_QWORD(inbuf, INIT_EVQ_IN_DMA_ADDR, i, dma_addr);
 118                 dma_addr += EFX_BUF_SIZE;
 119         }
 120
 121         inlen = MC_CMD_INIT_EVQ_IN_LEN(entries);
 122
 123         rc = efx_mcdi_rpc(efx, MC_CMD_INIT_EVQ, inbuf, inlen,
 124                           outbuf, sizeof(outbuf), &outlen);
 125
 126         if (outlen >= MC_CMD_INIT_EVQ_V2_OUT_LEN)
 127                 netif_dbg(efx, drv, efx->net_dev,
 128                           "Channel %d using event queue flags %08x\n",
 129                           channel->channel,
 130                           MCDI_DWORD(outbuf, INIT_EVQ_V2_OUT_FLAGS));
 131
 132         return rc;
 133 }
 134
 135 void efx_mcdi_ev_remove(struct efx_channel *channel)
 136 {
 137         efx_nic_free_buffer(channel->efx, &channel->eventq.buf);
 138 }
 139
 140 void efx_mcdi_ev_fini(struct efx_channel *channel)
 141 {
 142         MCDI_DECLARE_BUF(inbuf, MC_CMD_FINI_EVQ_IN_LEN);
 143         MCDI_DECLARE_BUF_ERR(outbuf);
 144         struct efx_nic *efx = channel->efx;
 145         size_t outlen;
 146         int rc;
 147
 148         MCDI_SET_DWORD(inbuf, FINI_EVQ_IN_INSTANCE, channel->channel);
 149
 150         rc = efx_mcdi_rpc_quiet(efx, MC_CMD_FINI_EVQ, inbuf, sizeof(inbuf),
 151                                 outbuf, sizeof(outbuf), &outlen);
 152
 153         if (rc && rc != -EALREADY)
 154                 goto fail;
 155
 156         return;
 157
 158 fail:
 159         efx_mcdi_display_error(efx, MC_CMD_FINI_EVQ, MC_CMD_FINI_EVQ_IN_LEN,
 160                                outbuf, outlen, rc);
 161 }
 162
 163 int efx_mcdi_tx_init(struct efx_tx_queue *tx_queue)
 164 {
 165         MCDI_DECLARE_BUF(inbuf, MC_CMD_INIT_TXQ_IN_LEN(EFX_MAX_DMAQ_SIZE * 8 /
 166                                                        EFX_BUF_SIZE));
 167         bool csum_offload = tx_queue->type & EFX_TXQ_TYPE_OUTER_CSUM;
 168         bool inner_csum = tx_queue->type & EFX_TXQ_TYPE_INNER_CSUM;
 169         size_t entries = tx_queue->txd.buf.len / EFX_BUF_SIZE;
 170         struct efx_channel *channel = tx_queue->channel;
 171         struct efx_nic *efx = tx_queue->efx;
 172         dma_addr_t dma_addr;
 173         size_t inlen;
 174         int rc, i;
 175
 176         BUILD_BUG_ON(MC_CMD_INIT_TXQ_OUT_LEN != 0);
 177
 178         MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_SIZE, tx_queue->ptr_mask + 1);
 179         MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_TARGET_EVQ, channel->channel);
 180         MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_LABEL, tx_queue->label);
 181         MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_INSTANCE, tx_queue->queue);
 182         MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_OWNER_ID, 0);
 183         MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_PORT_ID, efx->vport_id);
 184
 185         dma_addr = tx_queue->txd.buf.dma_addr;
 186
 187         netif_dbg(efx, hw, efx->net_dev, "pushing TXQ %d. %zu entries (%llx)\n",
 188                   tx_queue->queue, entries, (u64)dma_addr);
 189
 190         for (i = 0; i < entries; ++i) {
 191                 MCDI_SET_ARRAY_QWORD(inbuf, INIT_TXQ_IN_DMA_ADDR, i, dma_addr);
 192                 dma_addr += EFX_BUF_SIZE;
 193         }
 194
 195         inlen = MC_CMD_INIT_TXQ_IN_LEN(entries);
 196
 197         do {
 198                 bool tso_v2 = tx_queue->tso_version == 2;
 199
 200                 /* TSOv2 implies IP header checksum offload for TSO frames,
 201                  * so we can safely disable IP header checksum offload for
 202                  * everything else.  If we don't have TSOv2, then we have to
 203                  * enable IP header checksum offload, which is strictly
 204                  * incorrect but better than breaking TSO.
 205                  */
 206                 MCDI_POPULATE_DWORD_6(inbuf, INIT_TXQ_IN_FLAGS,
 207                                 /* This flag was removed from mcdi_pcol.h for
 208                                  * the non-_EXT version of INIT_TXQ.  However,
 209                                  * firmware still honours it.
 210                                  */
 211                                 INIT_TXQ_EXT_IN_FLAG_TSOV2_EN, tso_v2,
 212                                 INIT_TXQ_IN_FLAG_IP_CSUM_DIS, !(csum_offload && tso_v2),
 213                                 INIT_TXQ_IN_FLAG_TCP_CSUM_DIS, !csum_offload,
 214                                 INIT_TXQ_EXT_IN_FLAG_TIMESTAMP, tx_queue->timestamping,
 215                                 INIT_TXQ_IN_FLAG_INNER_IP_CSUM_EN, inner_csum && !tso_v2,
 216                                 INIT_TXQ_IN_FLAG_INNER_TCP_CSUM_EN, inner_csum);
 217
 218                 rc = efx_mcdi_rpc_quiet(efx, MC_CMD_INIT_TXQ, inbuf, inlen,
 219                                         NULL, 0, NULL);
 220                 if (rc == -ENOSPC && tso_v2) {
 221                         /* Retry without TSOv2 if we're short on contexts. */
 222                         tx_queue->tso_version = 0;
 223                         netif_warn(efx, probe, efx->net_dev,
 224                                    "TSOv2 context not available to segment in "
 225                                    "hardware. TCP performance may be reduced.\n"
 226                                    );
 227                 } else if (rc) {
 228                         efx_mcdi_display_error(efx, MC_CMD_INIT_TXQ,
 229                                                MC_CMD_INIT_TXQ_EXT_IN_LEN,
 230                                                NULL, 0, rc);
 231                         goto fail;
 232                 }
 233         } while (rc);
 234
 235         return 0;
 236
 237 fail:
 238         return rc;
 239 }
 240
 241 void efx_mcdi_tx_remove(struct efx_tx_queue *tx_queue)
 242 {
 243         efx_nic_free_buffer(tx_queue->efx, &tx_queue->txd.buf);
 244 }
 245
 246 void efx_mcdi_tx_fini(struct efx_tx_queue *tx_queue)
 247 {
 248         MCDI_DECLARE_BUF(inbuf, MC_CMD_FINI_TXQ_IN_LEN);
 249         MCDI_DECLARE_BUF_ERR(outbuf);
 250         struct efx_nic *efx = tx_queue->efx;
 251         size_t outlen;
 252         int rc;
 253
 254         MCDI_SET_DWORD(inbuf, FINI_TXQ_IN_INSTANCE,
 255                        tx_queue->queue);
 256
 257         rc = efx_mcdi_rpc_quiet(efx, MC_CMD_FINI_TXQ, inbuf, sizeof(inbuf),
 258                                 outbuf, sizeof(outbuf), &outlen);
 259
 260         if (rc && rc != -EALREADY)
 261                 goto fail;
 262
 263         return;
 264
 265 fail:
 266         efx_mcdi_display_error(efx, MC_CMD_FINI_TXQ, MC_CMD_FINI_TXQ_IN_LEN,
 267                                outbuf, outlen, rc);
 268 }
 269
 270 int efx_mcdi_rx_probe(struct efx_rx_queue *rx_queue)
 271 {
 272         return efx_nic_alloc_buffer(rx_queue->efx, &rx_queue->rxd.buf,
 273                                     (rx_queue->ptr_mask + 1) *
 274                                     sizeof(efx_qword_t),
 275                                     GFP_KERNEL);
 276 }
 277
 278 void efx_mcdi_rx_init(struct efx_rx_queue *rx_queue)
 279 {
 280         struct efx_channel *channel = efx_rx_queue_channel(rx_queue);
 281         size_t entries = rx_queue->rxd.buf.len / EFX_BUF_SIZE;
 282         MCDI_DECLARE_BUF(inbuf, MC_CMD_INIT_RXQ_V4_IN_LEN);
 283         struct efx_nic *efx = rx_queue->efx;
 284         unsigned int buffer_size;
 285         dma_addr_t dma_addr;
 286         int rc;
 287         int i;
 288         BUILD_BUG_ON(MC_CMD_INIT_RXQ_OUT_LEN != 0);
 289
 290         rx_queue->scatter_n = 0;
 291         rx_queue->scatter_len = 0;
 292         if (efx->type->revision == EFX_REV_EF100)
 293                 buffer_size = efx->rx_page_buf_step;
 294         else
 295                 buffer_size = 0;
 296
 297         MCDI_SET_DWORD(inbuf, INIT_RXQ_IN_SIZE, rx_queue->ptr_mask + 1);
 298         MCDI_SET_DWORD(inbuf, INIT_RXQ_IN_TARGET_EVQ, channel->channel);
 299         MCDI_SET_DWORD(inbuf, INIT_RXQ_IN_LABEL, efx_rx_queue_index(rx_queue));
 300         MCDI_SET_DWORD(inbuf, INIT_RXQ_IN_INSTANCE,
 301                        efx_rx_queue_index(rx_queue));
 302         MCDI_POPULATE_DWORD_2(inbuf, INIT_RXQ_IN_FLAGS,
 303                               INIT_RXQ_IN_FLAG_PREFIX, 1,
 304                               INIT_RXQ_IN_FLAG_TIMESTAMP, 1);
 305         MCDI_SET_DWORD(inbuf, INIT_RXQ_IN_OWNER_ID, 0);
 306         MCDI_SET_DWORD(inbuf, INIT_RXQ_IN_PORT_ID, efx->vport_id);
 307         MCDI_SET_DWORD(inbuf, INIT_RXQ_V4_IN_BUFFER_SIZE_BYTES, buffer_size);
 308
 309         dma_addr = rx_queue->rxd.buf.dma_addr;
 310
 311         netif_dbg(efx, hw, efx->net_dev, "pushing RXQ %d. %zu entries (%llx)\n",
 312                   efx_rx_queue_index(rx_queue), entries, (u64)dma_addr);
 313
 314         for (i = 0; i < entries; ++i) {
 315                 MCDI_SET_ARRAY_QWORD(inbuf, INIT_RXQ_IN_DMA_ADDR, i, dma_addr);
 316                 dma_addr += EFX_BUF_SIZE;
 317         }
 318
 319         rc = efx_mcdi_rpc(efx, MC_CMD_INIT_RXQ, inbuf, sizeof(inbuf),
 320                           NULL, 0, NULL);
 321         if (rc)
 322                 netdev_WARN(efx->net_dev, "failed to initialise RXQ %d\n",
 323                             efx_rx_queue_index(rx_queue));
 324 }
 325
 326 void efx_mcdi_rx_remove(struct efx_rx_queue *rx_queue)
 327 {
 328         efx_nic_free_buffer(rx_queue->efx, &rx_queue->rxd.buf);
 329 }
 330
 331 void efx_mcdi_rx_fini(struct efx_rx_queue *rx_queue)
 332 {
 333         MCDI_DECLARE_BUF(inbuf, MC_CMD_FINI_RXQ_IN_LEN);
 334         MCDI_DECLARE_BUF_ERR(outbuf);
 335         struct efx_nic *efx = rx_queue->efx;
 336         size_t outlen;
 337         int rc;
 338
 339         MCDI_SET_DWORD(inbuf, FINI_RXQ_IN_INSTANCE,
 340                        efx_rx_queue_index(rx_queue));
 341
 342         rc = efx_mcdi_rpc_quiet(efx, MC_CMD_FINI_RXQ, inbuf, sizeof(inbuf),
 343                                 outbuf, sizeof(outbuf), &outlen);
 344
 345         if (rc && rc != -EALREADY)
 346                 goto fail;
 347
 348         return;
 349
 350 fail:
 351         efx_mcdi_display_error(efx, MC_CMD_FINI_RXQ, MC_CMD_FINI_RXQ_IN_LEN,
 352                                outbuf, outlen, rc);
 353 }
 354
 355 int efx_fini_dmaq(struct efx_nic *efx)
 356 {
 357         struct efx_tx_queue *tx_queue;
 358         struct efx_rx_queue *rx_queue;
 359         struct efx_channel *channel;
 360         int pending;
 361
 362         /* If the MC has just rebooted, the TX/RX queues will have already been
 363          * torn down, but efx->active_queues needs to be set to zero.
 364          */
 365         if (efx->must_realloc_vis) {
 366                 atomic_set(&efx->active_queues, 0);
 367                 return 0;
 368         }
 369
 370         /* Do not attempt to write to the NIC during EEH recovery */
 371         if (efx->state != STATE_RECOVERY) {
 372                 efx_for_each_channel(channel, efx) {
 373                         efx_for_each_channel_rx_queue(rx_queue, channel)
 374                                 efx_mcdi_rx_fini(rx_queue);
 375                         efx_for_each_channel_tx_queue(tx_queue, channel)
 376                                 efx_mcdi_tx_fini(tx_queue);
 377                 }
 378
 379                 wait_event_timeout(efx->flush_wq,
 380                                    atomic_read(&efx->active_queues) == 0,
 381                                    msecs_to_jiffies(EFX_MAX_FLUSH_TIME));
 382                 pending = atomic_read(&efx->active_queues);
 383                 if (pending) {
 384                         netif_err(efx, hw, efx->net_dev, "failed to flush %d queues\n",
 385                                   pending);
 386                         return -ETIMEDOUT;
 387                 }
 388         }
 389
 390         return 0;
 391 }
 392
 393 int efx_mcdi_window_mode_to_stride(struct efx_nic *efx, u8 vi_window_mode)
 394 {
 395         switch (vi_window_mode) {
 396         case MC_CMD_GET_CAPABILITIES_V3_OUT_VI_WINDOW_MODE_8K:
 397                 efx->vi_stride = 8192;
 398                 break;
 399         case MC_CMD_GET_CAPABILITIES_V3_OUT_VI_WINDOW_MODE_16K:
 400                 efx->vi_stride = 16384;
 401                 break;
 402         case MC_CMD_GET_CAPABILITIES_V3_OUT_VI_WINDOW_MODE_64K:
 403                 efx->vi_stride = 65536;
 404                 break;
 405         default:
 406                 netif_err(efx, probe, efx->net_dev,
 407                           "Unrecognised VI window mode %d\n",
 408                           vi_window_mode);
 409                 return -EIO;
 410         }
 411         netif_dbg(efx, probe, efx->net_dev, "vi_stride = %u\n",
 412                   efx->vi_stride);
 413         return 0;
 414 }
 415
 416 int efx_get_pf_index(struct efx_nic *efx, unsigned int *pf_index)
 417 {
 418         MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_FUNCTION_INFO_OUT_LEN);
 419         size_t outlen;
 420         int rc;
 421
 422         rc = efx_mcdi_rpc(efx, MC_CMD_GET_FUNCTION_INFO, NULL, 0, outbuf,
 423                           sizeof(outbuf), &outlen);
 424         if (rc)
 425                 return rc;
 426         if (outlen < sizeof(outbuf))
 427                 return -EIO;
 428
 429         *pf_index = MCDI_DWORD(outbuf, GET_FUNCTION_INFO_OUT_PF);
 430         return 0;
 431 }