drivers/net/ethernet/sfc/mcdi.c

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This source file includes following definitions.
efx_mcdi_init
efx_mcdi_detach
efx_mcdi_fini
efx_mcdi_send_request
efx_mcdi_errno
efx_mcdi_read_response_header
efx_mcdi_poll_once
efx_mcdi_poll
efx_mcdi_poll_reboot
efx_mcdi_acquire_async
efx_mcdi_acquire_sync
efx_mcdi_await_completion
efx_mcdi_complete_sync
efx_mcdi_release
efx_mcdi_complete_async
efx_mcdi_ev_cpl
efx_mcdi_timeout_async
efx_mcdi_check_supported
efx_mcdi_get_proxy_handle
_efx_mcdi_rpc_finish
efx_mcdi_proxy_abort
efx_mcdi_ev_proxy_response
efx_mcdi_proxy_wait
_efx_mcdi_rpc
_efx_mcdi_rpc_evb_retry
efx_mcdi_rpc
efx_mcdi_rpc_quiet
efx_mcdi_rpc_start
_efx_mcdi_rpc_async
efx_mcdi_rpc_async
efx_mcdi_rpc_async_quiet
efx_mcdi_rpc_finish
efx_mcdi_rpc_finish_quiet
efx_mcdi_display_error
efx_mcdi_mode_poll
efx_mcdi_flush_async
efx_mcdi_mode_event
efx_mcdi_ev_death
efx_mcdi_ev_bist
efx_mcdi_abandon
efx_mcdi_process_event
efx_mcdi_print_fwver
efx_mcdi_drv_attach
efx_mcdi_get_board_cfg
efx_mcdi_log_ctrl
efx_mcdi_nvram_types
efx_mcdi_nvram_info
efx_mcdi_nvram_test
efx_mcdi_nvram_test_all
efx_mcdi_read_assertion
efx_mcdi_exit_assertion
efx_mcdi_handle_assertion
efx_mcdi_set_id_led
efx_mcdi_reset_func
efx_mcdi_reset_mc
efx_mcdi_map_reset_reason
efx_mcdi_reset
efx_mcdi_wol_filter_set
efx_mcdi_wol_filter_set_magic
efx_mcdi_wol_filter_get_magic
efx_mcdi_wol_filter_remove
efx_mcdi_flush_rxqs
efx_mcdi_wol_filter_reset
efx_mcdi_set_workaround
efx_mcdi_get_workarounds
efx_mcdi_nvram_update_start
efx_mcdi_nvram_read
efx_mcdi_nvram_write
efx_mcdi_nvram_erase
efx_mcdi_nvram_update_finish
efx_mcdi_mtd_read
efx_mcdi_mtd_erase
efx_mcdi_mtd_write
efx_mcdi_mtd_sync
efx_mcdi_mtd_rename
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /****************************************************************************
   3  * Driver for Solarflare network controllers and boards
   4  * Copyright 2008-2013 Solarflare Communications Inc.
   5  */
   6 
   7 #include <linux/delay.h>
   8 #include <linux/moduleparam.h>
   9 #include <linux/atomic.h>
  10 #include "net_driver.h"
  11 #include "nic.h"
  12 #include "io.h"
  13 #include "farch_regs.h"
  14 #include "mcdi_pcol.h"
  15 
  16 /**************************************************************************
  17  *
  18  * Management-Controller-to-Driver Interface
  19  *
  20  **************************************************************************
  21  */
  22 
  23 #define MCDI_RPC_TIMEOUT       (10 * HZ)
  24 
  25 /* A reboot/assertion causes the MCDI status word to be set after the
  26  * command word is set or a REBOOT event is sent. If we notice a reboot
  27  * via these mechanisms then wait 250ms for the status word to be set.
  28  */
  29 #define MCDI_STATUS_DELAY_US            100
  30 #define MCDI_STATUS_DELAY_COUNT         2500
  31 #define MCDI_STATUS_SLEEP_MS                                            \
  32         (MCDI_STATUS_DELAY_US * MCDI_STATUS_DELAY_COUNT / 1000)
  33 
  34 #define SEQ_MASK                                                        \
  35         EFX_MASK32(EFX_WIDTH(MCDI_HEADER_SEQ))
  36 
  37 struct efx_mcdi_async_param {
  38         struct list_head list;
  39         unsigned int cmd;
  40         size_t inlen;
  41         size_t outlen;
  42         bool quiet;
  43         efx_mcdi_async_completer *complete;
  44         unsigned long cookie;
  45         /* followed by request/response buffer */
  46 };
  47 
  48 static void efx_mcdi_timeout_async(struct timer_list *t);
  49 static int efx_mcdi_drv_attach(struct efx_nic *efx, bool driver_operating,
  50                                bool *was_attached_out);
  51 static bool efx_mcdi_poll_once(struct efx_nic *efx);
  52 static void efx_mcdi_abandon(struct efx_nic *efx);
  53 
  54 #ifdef CONFIG_SFC_MCDI_LOGGING
  55 static bool mcdi_logging_default;
  56 module_param(mcdi_logging_default, bool, 0644);
  57 MODULE_PARM_DESC(mcdi_logging_default,
  58                  "Enable MCDI logging on newly-probed functions");
  59 #endif
  60 
  61 int efx_mcdi_init(struct efx_nic *efx)
  62 {
  63         struct efx_mcdi_iface *mcdi;
  64         bool already_attached;
  65         int rc = -ENOMEM;
  66 
  67         efx->mcdi = kzalloc(sizeof(*efx->mcdi), GFP_KERNEL);
  68         if (!efx->mcdi)
  69                 goto fail;
  70 
  71         mcdi = efx_mcdi(efx);
  72         mcdi->efx = efx;
  73 #ifdef CONFIG_SFC_MCDI_LOGGING
  74         /* consuming code assumes buffer is page-sized */
  75         mcdi->logging_buffer = (char *)__get_free_page(GFP_KERNEL);
  76         if (!mcdi->logging_buffer)
  77                 goto fail1;
  78         mcdi->logging_enabled = mcdi_logging_default;
  79 #endif
  80         init_waitqueue_head(&mcdi->wq);
  81         init_waitqueue_head(&mcdi->proxy_rx_wq);
  82         spin_lock_init(&mcdi->iface_lock);
  83         mcdi->state = MCDI_STATE_QUIESCENT;
  84         mcdi->mode = MCDI_MODE_POLL;
  85         spin_lock_init(&mcdi->async_lock);
  86         INIT_LIST_HEAD(&mcdi->async_list);
  87         timer_setup(&mcdi->async_timer, efx_mcdi_timeout_async, 0);
  88 
  89         (void) efx_mcdi_poll_reboot(efx);
  90         mcdi->new_epoch = true;
  91 
  92         /* Recover from a failed assertion before probing */
  93         rc = efx_mcdi_handle_assertion(efx);
  94         if (rc)
  95                 goto fail2;
  96 
  97         /* Let the MC (and BMC, if this is a LOM) know that the driver
  98          * is loaded. We should do this before we reset the NIC.
  99          */
 100         rc = efx_mcdi_drv_attach(efx, true, &already_attached);
 101         if (rc) {
 102                 netif_err(efx, probe, efx->net_dev,
 103                           "Unable to register driver with MCPU\n");
 104                 goto fail2;
 105         }
 106         if (already_attached)
 107                 /* Not a fatal error */
 108                 netif_err(efx, probe, efx->net_dev,
 109                           "Host already registered with MCPU\n");
 110 
 111         if (efx->mcdi->fn_flags &
 112             (1 << MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_PRIMARY))
 113                 efx->primary = efx;
 114 
 115         return 0;
 116 fail2:
 117 #ifdef CONFIG_SFC_MCDI_LOGGING
 118         free_page((unsigned long)mcdi->logging_buffer);
 119 fail1:
 120 #endif
 121         kfree(efx->mcdi);
 122         efx->mcdi = NULL;
 123 fail:
 124         return rc;
 125 }
 126 
 127 void efx_mcdi_detach(struct efx_nic *efx)
 128 {
 129         if (!efx->mcdi)
 130                 return;
 131 
 132         BUG_ON(efx->mcdi->iface.state != MCDI_STATE_QUIESCENT);
 133 
 134         /* Relinquish the device (back to the BMC, if this is a LOM) */
 135         efx_mcdi_drv_attach(efx, false, NULL);
 136 }
 137 
 138 void efx_mcdi_fini(struct efx_nic *efx)
 139 {
 140         if (!efx->mcdi)
 141                 return;
 142 
 143 #ifdef CONFIG_SFC_MCDI_LOGGING
 144         free_page((unsigned long)efx->mcdi->iface.logging_buffer);
 145 #endif
 146 
 147         kfree(efx->mcdi);
 148 }
 149 
 150 static void efx_mcdi_send_request(struct efx_nic *efx, unsigned cmd,
 151                                   const efx_dword_t *inbuf, size_t inlen)
 152 {
 153         struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 154 #ifdef CONFIG_SFC_MCDI_LOGGING
 155         char *buf = mcdi->logging_buffer; /* page-sized */
 156 #endif
 157         efx_dword_t hdr[2];
 158         size_t hdr_len;
 159         u32 xflags, seqno;
 160 
 161         BUG_ON(mcdi->state == MCDI_STATE_QUIESCENT);
 162 
 163         /* Serialise with efx_mcdi_ev_cpl() and efx_mcdi_ev_death() */
 164         spin_lock_bh(&mcdi->iface_lock);
 165         ++mcdi->seqno;
 166         spin_unlock_bh(&mcdi->iface_lock);
 167 
 168         seqno = mcdi->seqno & SEQ_MASK;
 169         xflags = 0;
 170         if (mcdi->mode == MCDI_MODE_EVENTS)
 171                 xflags |= MCDI_HEADER_XFLAGS_EVREQ;
 172 
 173         if (efx->type->mcdi_max_ver == 1) {
 174                 /* MCDI v1 */
 175                 EFX_POPULATE_DWORD_7(hdr[0],
 176                                      MCDI_HEADER_RESPONSE, 0,
 177                                      MCDI_HEADER_RESYNC, 1,
 178                                      MCDI_HEADER_CODE, cmd,
 179                                      MCDI_HEADER_DATALEN, inlen,
 180                                      MCDI_HEADER_SEQ, seqno,
 181                                      MCDI_HEADER_XFLAGS, xflags,
 182                                      MCDI_HEADER_NOT_EPOCH, !mcdi->new_epoch);
 183                 hdr_len = 4;
 184         } else {
 185                 /* MCDI v2 */
 186                 BUG_ON(inlen > MCDI_CTL_SDU_LEN_MAX_V2);
 187                 EFX_POPULATE_DWORD_7(hdr[0],
 188                                      MCDI_HEADER_RESPONSE, 0,
 189                                      MCDI_HEADER_RESYNC, 1,
 190                                      MCDI_HEADER_CODE, MC_CMD_V2_EXTN,
 191                                      MCDI_HEADER_DATALEN, 0,
 192                                      MCDI_HEADER_SEQ, seqno,
 193                                      MCDI_HEADER_XFLAGS, xflags,
 194                                      MCDI_HEADER_NOT_EPOCH, !mcdi->new_epoch);
 195                 EFX_POPULATE_DWORD_2(hdr[1],
 196                                      MC_CMD_V2_EXTN_IN_EXTENDED_CMD, cmd,
 197                                      MC_CMD_V2_EXTN_IN_ACTUAL_LEN, inlen);
 198                 hdr_len = 8;
 199         }
 200 
 201 #ifdef CONFIG_SFC_MCDI_LOGGING
 202         if (mcdi->logging_enabled && !WARN_ON_ONCE(!buf)) {
 203                 int bytes = 0;
 204                 int i;
 205                 /* Lengths should always be a whole number of dwords, so scream
 206                  * if they're not.
 207                  */
 208                 WARN_ON_ONCE(hdr_len % 4);
 209                 WARN_ON_ONCE(inlen % 4);
 210 
 211                 /* We own the logging buffer, as only one MCDI can be in
 212                  * progress on a NIC at any one time.  So no need for locking.
 213                  */
 214                 for (i = 0; i < hdr_len / 4 && bytes < PAGE_SIZE; i++)
 215                         bytes += snprintf(buf + bytes, PAGE_SIZE - bytes,
 216                                           " %08x", le32_to_cpu(hdr[i].u32[0]));
 217 
 218                 for (i = 0; i < inlen / 4 && bytes < PAGE_SIZE; i++)
 219                         bytes += snprintf(buf + bytes, PAGE_SIZE - bytes,
 220                                           " %08x", le32_to_cpu(inbuf[i].u32[0]));
 221 
 222                 netif_info(efx, hw, efx->net_dev, "MCDI RPC REQ:%s\n", buf);
 223         }
 224 #endif
 225 
 226         efx->type->mcdi_request(efx, hdr, hdr_len, inbuf, inlen);
 227 
 228         mcdi->new_epoch = false;
 229 }
 230 
 231 static int efx_mcdi_errno(unsigned int mcdi_err)
 232 {
 233         switch (mcdi_err) {
 234         case 0:
 235                 return 0;
 236 #define TRANSLATE_ERROR(name)                                   \
 237         case MC_CMD_ERR_ ## name:                               \
 238                 return -name;
 239         TRANSLATE_ERROR(EPERM);
 240         TRANSLATE_ERROR(ENOENT);
 241         TRANSLATE_ERROR(EINTR);
 242         TRANSLATE_ERROR(EAGAIN);
 243         TRANSLATE_ERROR(EACCES);
 244         TRANSLATE_ERROR(EBUSY);
 245         TRANSLATE_ERROR(EINVAL);
 246         TRANSLATE_ERROR(EDEADLK);
 247         TRANSLATE_ERROR(ENOSYS);
 248         TRANSLATE_ERROR(ETIME);
 249         TRANSLATE_ERROR(EALREADY);
 250         TRANSLATE_ERROR(ENOSPC);
 251 #undef TRANSLATE_ERROR
 252         case MC_CMD_ERR_ENOTSUP:
 253                 return -EOPNOTSUPP;
 254         case MC_CMD_ERR_ALLOC_FAIL:
 255                 return -ENOBUFS;
 256         case MC_CMD_ERR_MAC_EXIST:
 257                 return -EADDRINUSE;
 258         default:
 259                 return -EPROTO;
 260         }
 261 }
 262 
 263 static void efx_mcdi_read_response_header(struct efx_nic *efx)
 264 {
 265         struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 266         unsigned int respseq, respcmd, error;
 267 #ifdef CONFIG_SFC_MCDI_LOGGING
 268         char *buf = mcdi->logging_buffer; /* page-sized */
 269 #endif
 270         efx_dword_t hdr;
 271 
 272         efx->type->mcdi_read_response(efx, &hdr, 0, 4);
 273         respseq = EFX_DWORD_FIELD(hdr, MCDI_HEADER_SEQ);
 274         respcmd = EFX_DWORD_FIELD(hdr, MCDI_HEADER_CODE);
 275         error = EFX_DWORD_FIELD(hdr, MCDI_HEADER_ERROR);
 276 
 277         if (respcmd != MC_CMD_V2_EXTN) {
 278                 mcdi->resp_hdr_len = 4;
 279                 mcdi->resp_data_len = EFX_DWORD_FIELD(hdr, MCDI_HEADER_DATALEN);
 280         } else {
 281                 efx->type->mcdi_read_response(efx, &hdr, 4, 4);
 282                 mcdi->resp_hdr_len = 8;
 283                 mcdi->resp_data_len =
 284                         EFX_DWORD_FIELD(hdr, MC_CMD_V2_EXTN_IN_ACTUAL_LEN);
 285         }
 286 
 287 #ifdef CONFIG_SFC_MCDI_LOGGING
 288         if (mcdi->logging_enabled && !WARN_ON_ONCE(!buf)) {
 289                 size_t hdr_len, data_len;
 290                 int bytes = 0;
 291                 int i;
 292 
 293                 WARN_ON_ONCE(mcdi->resp_hdr_len % 4);
 294                 hdr_len = mcdi->resp_hdr_len / 4;
 295                 /* MCDI_DECLARE_BUF ensures that underlying buffer is padded
 296                  * to dword size, and the MCDI buffer is always dword size
 297                  */
 298                 data_len = DIV_ROUND_UP(mcdi->resp_data_len, 4);
 299 
 300                 /* We own the logging buffer, as only one MCDI can be in
 301                  * progress on a NIC at any one time.  So no need for locking.
 302                  */
 303                 for (i = 0; i < hdr_len && bytes < PAGE_SIZE; i++) {
 304                         efx->type->mcdi_read_response(efx, &hdr, (i * 4), 4);
 305                         bytes += snprintf(buf + bytes, PAGE_SIZE - bytes,
 306                                           " %08x", le32_to_cpu(hdr.u32[0]));
 307                 }
 308 
 309                 for (i = 0; i < data_len && bytes < PAGE_SIZE; i++) {
 310                         efx->type->mcdi_read_response(efx, &hdr,
 311                                         mcdi->resp_hdr_len + (i * 4), 4);
 312                         bytes += snprintf(buf + bytes, PAGE_SIZE - bytes,
 313                                           " %08x", le32_to_cpu(hdr.u32[0]));
 314                 }
 315 
 316                 netif_info(efx, hw, efx->net_dev, "MCDI RPC RESP:%s\n", buf);
 317         }
 318 #endif
 319 
 320         mcdi->resprc_raw = 0;
 321         if (error && mcdi->resp_data_len == 0) {
 322                 netif_err(efx, hw, efx->net_dev, "MC rebooted\n");
 323                 mcdi->resprc = -EIO;
 324         } else if ((respseq ^ mcdi->seqno) & SEQ_MASK) {
 325                 netif_err(efx, hw, efx->net_dev,
 326                           "MC response mismatch tx seq 0x%x rx seq 0x%x\n",
 327                           respseq, mcdi->seqno);
 328                 mcdi->resprc = -EIO;
 329         } else if (error) {
 330                 efx->type->mcdi_read_response(efx, &hdr, mcdi->resp_hdr_len, 4);
 331                 mcdi->resprc_raw = EFX_DWORD_FIELD(hdr, EFX_DWORD_0);
 332                 mcdi->resprc = efx_mcdi_errno(mcdi->resprc_raw);
 333         } else {
 334                 mcdi->resprc = 0;
 335         }
 336 }
 337 
 338 static bool efx_mcdi_poll_once(struct efx_nic *efx)
 339 {
 340         struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 341 
 342         rmb();
 343         if (!efx->type->mcdi_poll_response(efx))
 344                 return false;
 345 
 346         spin_lock_bh(&mcdi->iface_lock);
 347         efx_mcdi_read_response_header(efx);
 348         spin_unlock_bh(&mcdi->iface_lock);
 349 
 350         return true;
 351 }
 352 
 353 static int efx_mcdi_poll(struct efx_nic *efx)
 354 {
 355         struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 356         unsigned long time, finish;
 357         unsigned int spins;
 358         int rc;
 359 
 360         /* Check for a reboot atomically with respect to efx_mcdi_copyout() */
 361         rc = efx_mcdi_poll_reboot(efx);
 362         if (rc) {
 363                 spin_lock_bh(&mcdi->iface_lock);
 364                 mcdi->resprc = rc;
 365                 mcdi->resp_hdr_len = 0;
 366                 mcdi->resp_data_len = 0;
 367                 spin_unlock_bh(&mcdi->iface_lock);
 368                 return 0;
 369         }
 370 
 371         /* Poll for completion. Poll quickly (once a us) for the 1st jiffy,
 372          * because generally mcdi responses are fast. After that, back off
 373          * and poll once a jiffy (approximately)
 374          */
 375         spins = USER_TICK_USEC;
 376         finish = jiffies + MCDI_RPC_TIMEOUT;
 377 
 378         while (1) {
 379                 if (spins != 0) {
 380                         --spins;
 381                         udelay(1);
 382                 } else {
 383                         schedule_timeout_uninterruptible(1);
 384                 }
 385 
 386                 time = jiffies;
 387 
 388                 if (efx_mcdi_poll_once(efx))
 389                         break;
 390 
 391                 if (time_after(time, finish))
 392                         return -ETIMEDOUT;
 393         }
 394 
 395         /* Return rc=0 like wait_event_timeout() */
 396         return 0;
 397 }
 398 
 399 /* Test and clear MC-rebooted flag for this port/function; reset
 400  * software state as necessary.
 401  */
 402 int efx_mcdi_poll_reboot(struct efx_nic *efx)
 403 {
 404         if (!efx->mcdi)
 405                 return 0;
 406 
 407         return efx->type->mcdi_poll_reboot(efx);
 408 }
 409 
 410 static bool efx_mcdi_acquire_async(struct efx_mcdi_iface *mcdi)
 411 {
 412         return cmpxchg(&mcdi->state,
 413                        MCDI_STATE_QUIESCENT, MCDI_STATE_RUNNING_ASYNC) ==
 414                 MCDI_STATE_QUIESCENT;
 415 }
 416 
 417 static void efx_mcdi_acquire_sync(struct efx_mcdi_iface *mcdi)
 418 {
 419         /* Wait until the interface becomes QUIESCENT and we win the race
 420          * to mark it RUNNING_SYNC.
 421          */
 422         wait_event(mcdi->wq,
 423                    cmpxchg(&mcdi->state,
 424                            MCDI_STATE_QUIESCENT, MCDI_STATE_RUNNING_SYNC) ==
 425                    MCDI_STATE_QUIESCENT);
 426 }
 427 
 428 static int efx_mcdi_await_completion(struct efx_nic *efx)
 429 {
 430         struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 431 
 432         if (wait_event_timeout(mcdi->wq, mcdi->state == MCDI_STATE_COMPLETED,
 433                                MCDI_RPC_TIMEOUT) == 0)
 434                 return -ETIMEDOUT;
 435 
 436         /* Check if efx_mcdi_set_mode() switched us back to polled completions.
 437          * In which case, poll for completions directly. If efx_mcdi_ev_cpl()
 438          * completed the request first, then we'll just end up completing the
 439          * request again, which is safe.
 440          *
 441          * We need an smp_rmb() to synchronise with efx_mcdi_mode_poll(), which
 442          * wait_event_timeout() implicitly provides.
 443          */
 444         if (mcdi->mode == MCDI_MODE_POLL)
 445                 return efx_mcdi_poll(efx);
 446 
 447         return 0;
 448 }
 449 
 450 /* If the interface is RUNNING_SYNC, switch to COMPLETED and wake the
 451  * requester.  Return whether this was done.  Does not take any locks.
 452  */
 453 static bool efx_mcdi_complete_sync(struct efx_mcdi_iface *mcdi)
 454 {
 455         if (cmpxchg(&mcdi->state,
 456                     MCDI_STATE_RUNNING_SYNC, MCDI_STATE_COMPLETED) ==
 457             MCDI_STATE_RUNNING_SYNC) {
 458                 wake_up(&mcdi->wq);
 459                 return true;
 460         }
 461 
 462         return false;
 463 }
 464 
 465 static void efx_mcdi_release(struct efx_mcdi_iface *mcdi)
 466 {
 467         if (mcdi->mode == MCDI_MODE_EVENTS) {
 468                 struct efx_mcdi_async_param *async;
 469                 struct efx_nic *efx = mcdi->efx;
 470 
 471                 /* Process the asynchronous request queue */
 472                 spin_lock_bh(&mcdi->async_lock);
 473                 async = list_first_entry_or_null(
 474                         &mcdi->async_list, struct efx_mcdi_async_param, list);
 475                 if (async) {
 476                         mcdi->state = MCDI_STATE_RUNNING_ASYNC;
 477                         efx_mcdi_send_request(efx, async->cmd,
 478                                               (const efx_dword_t *)(async + 1),
 479                                               async->inlen);
 480                         mod_timer(&mcdi->async_timer,
 481                                   jiffies + MCDI_RPC_TIMEOUT);
 482                 }
 483                 spin_unlock_bh(&mcdi->async_lock);
 484 
 485                 if (async)
 486                         return;
 487         }
 488 
 489         mcdi->state = MCDI_STATE_QUIESCENT;
 490         wake_up(&mcdi->wq);
 491 }
 492 
 493 /* If the interface is RUNNING_ASYNC, switch to COMPLETED, call the
 494  * asynchronous completion function, and release the interface.
 495  * Return whether this was done.  Must be called in bh-disabled
 496  * context.  Will take iface_lock and async_lock.
 497  */
 498 static bool efx_mcdi_complete_async(struct efx_mcdi_iface *mcdi, bool timeout)
 499 {
 500         struct efx_nic *efx = mcdi->efx;
 501         struct efx_mcdi_async_param *async;
 502         size_t hdr_len, data_len, err_len;
 503         efx_dword_t *outbuf;
 504         MCDI_DECLARE_BUF_ERR(errbuf);
 505         int rc;
 506 
 507         if (cmpxchg(&mcdi->state,
 508                     MCDI_STATE_RUNNING_ASYNC, MCDI_STATE_COMPLETED) !=
 509             MCDI_STATE_RUNNING_ASYNC)
 510                 return false;
 511 
 512         spin_lock(&mcdi->iface_lock);
 513         if (timeout) {
 514                 /* Ensure that if the completion event arrives later,
 515                  * the seqno check in efx_mcdi_ev_cpl() will fail
 516                  */
 517                 ++mcdi->seqno;
 518                 ++mcdi->credits;
 519                 rc = -ETIMEDOUT;
 520                 hdr_len = 0;
 521                 data_len = 0;
 522         } else {
 523                 rc = mcdi->resprc;
 524                 hdr_len = mcdi->resp_hdr_len;
 525                 data_len = mcdi->resp_data_len;
 526         }
 527         spin_unlock(&mcdi->iface_lock);
 528 
 529         /* Stop the timer.  In case the timer function is running, we
 530          * must wait for it to return so that there is no possibility
 531          * of it aborting the next request.
 532          */
 533         if (!timeout)
 534                 del_timer_sync(&mcdi->async_timer);
 535 
 536         spin_lock(&mcdi->async_lock);
 537         async = list_first_entry(&mcdi->async_list,
 538                                  struct efx_mcdi_async_param, list);
 539         list_del(&async->list);
 540         spin_unlock(&mcdi->async_lock);
 541 
 542         outbuf = (efx_dword_t *)(async + 1);
 543         efx->type->mcdi_read_response(efx, outbuf, hdr_len,
 544                                       min(async->outlen, data_len));
 545         if (!timeout && rc && !async->quiet) {
 546                 err_len = min(sizeof(errbuf), data_len);
 547                 efx->type->mcdi_read_response(efx, errbuf, hdr_len,
 548                                               sizeof(errbuf));
 549                 efx_mcdi_display_error(efx, async->cmd, async->inlen, errbuf,
 550                                        err_len, rc);
 551         }
 552 
 553         if (async->complete)
 554                 async->complete(efx, async->cookie, rc, outbuf,
 555                                 min(async->outlen, data_len));
 556         kfree(async);
 557 
 558         efx_mcdi_release(mcdi);
 559 
 560         return true;
 561 }
 562 
 563 static void efx_mcdi_ev_cpl(struct efx_nic *efx, unsigned int seqno,
 564                             unsigned int datalen, unsigned int mcdi_err)
 565 {
 566         struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 567         bool wake = false;
 568 
 569         spin_lock(&mcdi->iface_lock);
 570 
 571         if ((seqno ^ mcdi->seqno) & SEQ_MASK) {
 572                 if (mcdi->credits)
 573                         /* The request has been cancelled */
 574                         --mcdi->credits;
 575                 else
 576                         netif_err(efx, hw, efx->net_dev,
 577                                   "MC response mismatch tx seq 0x%x rx "
 578                                   "seq 0x%x\n", seqno, mcdi->seqno);
 579         } else {
 580                 if (efx->type->mcdi_max_ver >= 2) {
 581                         /* MCDI v2 responses don't fit in an event */
 582                         efx_mcdi_read_response_header(efx);
 583                 } else {
 584                         mcdi->resprc = efx_mcdi_errno(mcdi_err);
 585                         mcdi->resp_hdr_len = 4;
 586                         mcdi->resp_data_len = datalen;
 587                 }
 588 
 589                 wake = true;
 590         }
 591 
 592         spin_unlock(&mcdi->iface_lock);
 593 
 594         if (wake) {
 595                 if (!efx_mcdi_complete_async(mcdi, false))
 596                         (void) efx_mcdi_complete_sync(mcdi);
 597 
 598                 /* If the interface isn't RUNNING_ASYNC or
 599                  * RUNNING_SYNC then we've received a duplicate
 600                  * completion after we've already transitioned back to
 601                  * QUIESCENT. [A subsequent invocation would increment
 602                  * seqno, so would have failed the seqno check].
 603                  */
 604         }
 605 }
 606 
 607 static void efx_mcdi_timeout_async(struct timer_list *t)
 608 {
 609         struct efx_mcdi_iface *mcdi = from_timer(mcdi, t, async_timer);
 610 
 611         efx_mcdi_complete_async(mcdi, true);
 612 }
 613 
 614 static int
 615 efx_mcdi_check_supported(struct efx_nic *efx, unsigned int cmd, size_t inlen)
 616 {
 617         if (efx->type->mcdi_max_ver < 0 ||
 618              (efx->type->mcdi_max_ver < 2 &&
 619               cmd > MC_CMD_CMD_SPACE_ESCAPE_7))
 620                 return -EINVAL;
 621 
 622         if (inlen > MCDI_CTL_SDU_LEN_MAX_V2 ||
 623             (efx->type->mcdi_max_ver < 2 &&
 624              inlen > MCDI_CTL_SDU_LEN_MAX_V1))
 625                 return -EMSGSIZE;
 626 
 627         return 0;
 628 }
 629 
 630 static bool efx_mcdi_get_proxy_handle(struct efx_nic *efx,
 631                                       size_t hdr_len, size_t data_len,
 632                                       u32 *proxy_handle)
 633 {
 634         MCDI_DECLARE_BUF_ERR(testbuf);
 635         const size_t buflen = sizeof(testbuf);
 636 
 637         if (!proxy_handle || data_len < buflen)
 638                 return false;
 639 
 640         efx->type->mcdi_read_response(efx, testbuf, hdr_len, buflen);
 641         if (MCDI_DWORD(testbuf, ERR_CODE) == MC_CMD_ERR_PROXY_PENDING) {
 642                 *proxy_handle = MCDI_DWORD(testbuf, ERR_PROXY_PENDING_HANDLE);
 643                 return true;
 644         }
 645 
 646         return false;
 647 }
 648 
 649 static int _efx_mcdi_rpc_finish(struct efx_nic *efx, unsigned int cmd,
 650                                 size_t inlen,
 651                                 efx_dword_t *outbuf, size_t outlen,
 652                                 size_t *outlen_actual, bool quiet,
 653                                 u32 *proxy_handle, int *raw_rc)
 654 {
 655         struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 656         MCDI_DECLARE_BUF_ERR(errbuf);
 657         int rc;
 658 
 659         if (mcdi->mode == MCDI_MODE_POLL)
 660                 rc = efx_mcdi_poll(efx);
 661         else
 662                 rc = efx_mcdi_await_completion(efx);
 663 
 664         if (rc != 0) {
 665                 netif_err(efx, hw, efx->net_dev,
 666                           "MC command 0x%x inlen %d mode %d timed out\n",
 667                           cmd, (int)inlen, mcdi->mode);
 668 
 669                 if (mcdi->mode == MCDI_MODE_EVENTS && efx_mcdi_poll_once(efx)) {
 670                         netif_err(efx, hw, efx->net_dev,
 671                                   "MCDI request was completed without an event\n");
 672                         rc = 0;
 673                 }
 674 
 675                 efx_mcdi_abandon(efx);
 676 
 677                 /* Close the race with efx_mcdi_ev_cpl() executing just too late
 678                  * and completing a request we've just cancelled, by ensuring
 679                  * that the seqno check therein fails.
 680                  */
 681                 spin_lock_bh(&mcdi->iface_lock);
 682                 ++mcdi->seqno;
 683                 ++mcdi->credits;
 684                 spin_unlock_bh(&mcdi->iface_lock);
 685         }
 686 
 687         if (proxy_handle)
 688                 *proxy_handle = 0;
 689 
 690         if (rc != 0) {
 691                 if (outlen_actual)
 692                         *outlen_actual = 0;
 693         } else {
 694                 size_t hdr_len, data_len, err_len;
 695 
 696                 /* At the very least we need a memory barrier here to ensure
 697                  * we pick up changes from efx_mcdi_ev_cpl(). Protect against
 698                  * a spurious efx_mcdi_ev_cpl() running concurrently by
 699                  * acquiring the iface_lock. */
 700                 spin_lock_bh(&mcdi->iface_lock);
 701                 rc = mcdi->resprc;
 702                 if (raw_rc)
 703                         *raw_rc = mcdi->resprc_raw;
 704                 hdr_len = mcdi->resp_hdr_len;
 705                 data_len = mcdi->resp_data_len;
 706                 err_len = min(sizeof(errbuf), data_len);
 707                 spin_unlock_bh(&mcdi->iface_lock);
 708 
 709                 BUG_ON(rc > 0);
 710 
 711                 efx->type->mcdi_read_response(efx, outbuf, hdr_len,
 712                                               min(outlen, data_len));
 713                 if (outlen_actual)
 714                         *outlen_actual = data_len;
 715 
 716                 efx->type->mcdi_read_response(efx, errbuf, hdr_len, err_len);
 717 
 718                 if (cmd == MC_CMD_REBOOT && rc == -EIO) {
 719                         /* Don't reset if MC_CMD_REBOOT returns EIO */
 720                 } else if (rc == -EIO || rc == -EINTR) {
 721                         netif_err(efx, hw, efx->net_dev, "MC reboot detected\n");
 722                         netif_dbg(efx, hw, efx->net_dev, "MC rebooted during command %d rc %d\n",
 723                                   cmd, -rc);
 724                         if (efx->type->mcdi_reboot_detected)
 725                                 efx->type->mcdi_reboot_detected(efx);
 726                         efx_schedule_reset(efx, RESET_TYPE_MC_FAILURE);
 727                 } else if (proxy_handle && (rc == -EPROTO) &&
 728                            efx_mcdi_get_proxy_handle(efx, hdr_len, data_len,
 729                                                      proxy_handle)) {
 730                         mcdi->proxy_rx_status = 0;
 731                         mcdi->proxy_rx_handle = 0;
 732                         mcdi->state = MCDI_STATE_PROXY_WAIT;
 733                 } else if (rc && !quiet) {
 734                         efx_mcdi_display_error(efx, cmd, inlen, errbuf, err_len,
 735                                                rc);
 736                 }
 737 
 738                 if (rc == -EIO || rc == -EINTR) {
 739                         msleep(MCDI_STATUS_SLEEP_MS);
 740                         efx_mcdi_poll_reboot(efx);
 741                         mcdi->new_epoch = true;
 742                 }
 743         }
 744 
 745         if (!proxy_handle || !*proxy_handle)
 746                 efx_mcdi_release(mcdi);
 747         return rc;
 748 }
 749 
 750 static void efx_mcdi_proxy_abort(struct efx_mcdi_iface *mcdi)
 751 {
 752         if (mcdi->state == MCDI_STATE_PROXY_WAIT) {
 753                 /* Interrupt the proxy wait. */
 754                 mcdi->proxy_rx_status = -EINTR;
 755                 wake_up(&mcdi->proxy_rx_wq);
 756         }
 757 }
 758 
 759 static void efx_mcdi_ev_proxy_response(struct efx_nic *efx,
 760                                        u32 handle, int status)
 761 {
 762         struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 763 
 764         WARN_ON(mcdi->state != MCDI_STATE_PROXY_WAIT);
 765 
 766         mcdi->proxy_rx_status = efx_mcdi_errno(status);
 767         /* Ensure the status is written before we update the handle, since the
 768          * latter is used to check if we've finished.
 769          */
 770         wmb();
 771         mcdi->proxy_rx_handle = handle;
 772         wake_up(&mcdi->proxy_rx_wq);
 773 }
 774 
 775 static int efx_mcdi_proxy_wait(struct efx_nic *efx, u32 handle, bool quiet)
 776 {
 777         struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 778         int rc;
 779 
 780         /* Wait for a proxy event, or timeout. */
 781         rc = wait_event_timeout(mcdi->proxy_rx_wq,
 782                                 mcdi->proxy_rx_handle != 0 ||
 783                                 mcdi->proxy_rx_status == -EINTR,
 784                                 MCDI_RPC_TIMEOUT);
 785 
 786         if (rc <= 0) {
 787                 netif_dbg(efx, hw, efx->net_dev,
 788                           "MCDI proxy timeout %d\n", handle);
 789                 return -ETIMEDOUT;
 790         } else if (mcdi->proxy_rx_handle != handle) {
 791                 netif_warn(efx, hw, efx->net_dev,
 792                            "MCDI proxy unexpected handle %d (expected %d)\n",
 793                            mcdi->proxy_rx_handle, handle);
 794                 return -EINVAL;
 795         }
 796 
 797         return mcdi->proxy_rx_status;
 798 }
 799 
 800 static int _efx_mcdi_rpc(struct efx_nic *efx, unsigned int cmd,
 801                          const efx_dword_t *inbuf, size_t inlen,
 802                          efx_dword_t *outbuf, size_t outlen,
 803                          size_t *outlen_actual, bool quiet, int *raw_rc)
 804 {
 805         u32 proxy_handle = 0; /* Zero is an invalid proxy handle. */
 806         int rc;
 807 
 808         if (inbuf && inlen && (inbuf == outbuf)) {
 809                 /* The input buffer can't be aliased with the output. */
 810                 WARN_ON(1);
 811                 return -EINVAL;
 812         }
 813 
 814         rc = efx_mcdi_rpc_start(efx, cmd, inbuf, inlen);
 815         if (rc)
 816                 return rc;
 817 
 818         rc = _efx_mcdi_rpc_finish(efx, cmd, inlen, outbuf, outlen,
 819                                   outlen_actual, quiet, &proxy_handle, raw_rc);
 820 
 821         if (proxy_handle) {
 822                 /* Handle proxy authorisation. This allows approval of MCDI
 823                  * operations to be delegated to the admin function, allowing
 824                  * fine control over (eg) multicast subscriptions.
 825                  */
 826                 struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 827 
 828                 netif_dbg(efx, hw, efx->net_dev,
 829                           "MCDI waiting for proxy auth %d\n",
 830                           proxy_handle);
 831                 rc = efx_mcdi_proxy_wait(efx, proxy_handle, quiet);
 832 
 833                 if (rc == 0) {
 834                         netif_dbg(efx, hw, efx->net_dev,
 835                                   "MCDI proxy retry %d\n", proxy_handle);
 836 
 837                         /* We now retry the original request. */
 838                         mcdi->state = MCDI_STATE_RUNNING_SYNC;
 839                         efx_mcdi_send_request(efx, cmd, inbuf, inlen);
 840 
 841                         rc = _efx_mcdi_rpc_finish(efx, cmd, inlen,
 842                                                   outbuf, outlen, outlen_actual,
 843                                                   quiet, NULL, raw_rc);
 844                 } else {
 845                         netif_cond_dbg(efx, hw, efx->net_dev, rc == -EPERM, err,
 846                                        "MC command 0x%x failed after proxy auth rc=%d\n",
 847                                        cmd, rc);
 848 
 849                         if (rc == -EINTR || rc == -EIO)
 850                                 efx_schedule_reset(efx, RESET_TYPE_MC_FAILURE);
 851                         efx_mcdi_release(mcdi);
 852                 }
 853         }
 854 
 855         return rc;
 856 }
 857 
 858 static int _efx_mcdi_rpc_evb_retry(struct efx_nic *efx, unsigned cmd,
 859                                    const efx_dword_t *inbuf, size_t inlen,
 860                                    efx_dword_t *outbuf, size_t outlen,
 861                                    size_t *outlen_actual, bool quiet)
 862 {
 863         int raw_rc = 0;
 864         int rc;
 865 
 866         rc = _efx_mcdi_rpc(efx, cmd, inbuf, inlen,
 867                            outbuf, outlen, outlen_actual, true, &raw_rc);
 868 
 869         if ((rc == -EPROTO) && (raw_rc == MC_CMD_ERR_NO_EVB_PORT) &&
 870             efx->type->is_vf) {
 871                 /* If the EVB port isn't available within a VF this may
 872                  * mean the PF is still bringing the switch up. We should
 873                  * retry our request shortly.
 874                  */
 875                 unsigned long abort_time = jiffies + MCDI_RPC_TIMEOUT;
 876                 unsigned int delay_us = 10000;
 877 
 878                 netif_dbg(efx, hw, efx->net_dev,
 879                           "%s: NO_EVB_PORT; will retry request\n",
 880                           __func__);
 881 
 882                 do {
 883                         usleep_range(delay_us, delay_us + 10000);
 884                         rc = _efx_mcdi_rpc(efx, cmd, inbuf, inlen,
 885                                            outbuf, outlen, outlen_actual,
 886                                            true, &raw_rc);
 887                         if (delay_us < 100000)
 888                                 delay_us <<= 1;
 889                 } while ((rc == -EPROTO) &&
 890                          (raw_rc == MC_CMD_ERR_NO_EVB_PORT) &&
 891                          time_before(jiffies, abort_time));
 892         }
 893 
 894         if (rc && !quiet && !(cmd == MC_CMD_REBOOT && rc == -EIO))
 895                 efx_mcdi_display_error(efx, cmd, inlen,
 896                                        outbuf, outlen, rc);
 897 
 898         return rc;
 899 }
 900 
 901 /**
 902  * efx_mcdi_rpc - Issue an MCDI command and wait for completion
 903  * @efx: NIC through which to issue the command
 904  * @cmd: Command type number
 905  * @inbuf: Command parameters
 906  * @inlen: Length of command parameters, in bytes.  Must be a multiple
 907  *      of 4 and no greater than %MCDI_CTL_SDU_LEN_MAX_V1.
 908  * @outbuf: Response buffer.  May be %NULL if @outlen is 0.
 909  * @outlen: Length of response buffer, in bytes.  If the actual
 910  *      response is longer than @outlen & ~3, it will be truncated
 911  *      to that length.
 912  * @outlen_actual: Pointer through which to return the actual response
 913  *      length.  May be %NULL if this is not needed.
 914  *
 915  * This function may sleep and therefore must be called in an appropriate
 916  * context.
 917  *
 918  * Return: A negative error code, or zero if successful.  The error
 919  *      code may come from the MCDI response or may indicate a failure
 920  *      to communicate with the MC.  In the former case, the response
 921  *      will still be copied to @outbuf and *@outlen_actual will be
 922  *      set accordingly.  In the latter case, *@outlen_actual will be
 923  *      set to zero.
 924  */
 925 int efx_mcdi_rpc(struct efx_nic *efx, unsigned cmd,
 926                  const efx_dword_t *inbuf, size_t inlen,
 927                  efx_dword_t *outbuf, size_t outlen,
 928                  size_t *outlen_actual)
 929 {
 930         return _efx_mcdi_rpc_evb_retry(efx, cmd, inbuf, inlen, outbuf, outlen,
 931                                        outlen_actual, false);
 932 }
 933 
 934 /* Normally, on receiving an error code in the MCDI response,
 935  * efx_mcdi_rpc will log an error message containing (among other
 936  * things) the raw error code, by means of efx_mcdi_display_error.
 937  * This _quiet version suppresses that; if the caller wishes to log
 938  * the error conditionally on the return code, it should call this
 939  * function and is then responsible for calling efx_mcdi_display_error
 940  * as needed.
 941  */
 942 int efx_mcdi_rpc_quiet(struct efx_nic *efx, unsigned cmd,
 943                        const efx_dword_t *inbuf, size_t inlen,
 944                        efx_dword_t *outbuf, size_t outlen,
 945                        size_t *outlen_actual)
 946 {
 947         return _efx_mcdi_rpc_evb_retry(efx, cmd, inbuf, inlen, outbuf, outlen,
 948                                        outlen_actual, true);
 949 }
 950 
 951 int efx_mcdi_rpc_start(struct efx_nic *efx, unsigned cmd,
 952                        const efx_dword_t *inbuf, size_t inlen)
 953 {
 954         struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 955         int rc;
 956 
 957         rc = efx_mcdi_check_supported(efx, cmd, inlen);
 958         if (rc)
 959                 return rc;
 960 
 961         if (efx->mc_bist_for_other_fn)
 962                 return -ENETDOWN;
 963 
 964         if (mcdi->mode == MCDI_MODE_FAIL)
 965                 return -ENETDOWN;
 966 
 967         efx_mcdi_acquire_sync(mcdi);
 968         efx_mcdi_send_request(efx, cmd, inbuf, inlen);
 969         return 0;
 970 }
 971 
 972 static int _efx_mcdi_rpc_async(struct efx_nic *efx, unsigned int cmd,
 973                                const efx_dword_t *inbuf, size_t inlen,
 974                                size_t outlen,
 975                                efx_mcdi_async_completer *complete,
 976                                unsigned long cookie, bool quiet)
 977 {
 978         struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 979         struct efx_mcdi_async_param *async;
 980         int rc;
 981 
 982         rc = efx_mcdi_check_supported(efx, cmd, inlen);
 983         if (rc)
 984                 return rc;
 985 
 986         if (efx->mc_bist_for_other_fn)
 987                 return -ENETDOWN;
 988 
 989         async = kmalloc(sizeof(*async) + ALIGN(max(inlen, outlen), 4),
 990                         GFP_ATOMIC);
 991         if (!async)
 992                 return -ENOMEM;
 993 
 994         async->cmd = cmd;
 995         async->inlen = inlen;
 996         async->outlen = outlen;
 997         async->quiet = quiet;
 998         async->complete = complete;
 999         async->cookie = cookie;
1000         memcpy(async + 1, inbuf, inlen);
1001 
1002         spin_lock_bh(&mcdi->async_lock);
1003 
1004         if (mcdi->mode == MCDI_MODE_EVENTS) {
1005                 list_add_tail(&async->list, &mcdi->async_list);
1006 
1007                 /* If this is at the front of the queue, try to start it
1008                  * immediately
1009                  */
1010                 if (mcdi->async_list.next == &async->list &&
1011                     efx_mcdi_acquire_async(mcdi)) {
1012                         efx_mcdi_send_request(efx, cmd, inbuf, inlen);
1013                         mod_timer(&mcdi->async_timer,
1014                                   jiffies + MCDI_RPC_TIMEOUT);
1015                 }
1016         } else {
1017                 kfree(async);
1018                 rc = -ENETDOWN;
1019         }
1020 
1021         spin_unlock_bh(&mcdi->async_lock);
1022 
1023         return rc;
1024 }
1025 
1026 /**
1027  * efx_mcdi_rpc_async - Schedule an MCDI command to run asynchronously
1028  * @efx: NIC through which to issue the command
1029  * @cmd: Command type number
1030  * @inbuf: Command parameters
1031  * @inlen: Length of command parameters, in bytes
1032  * @outlen: Length to allocate for response buffer, in bytes
1033  * @complete: Function to be called on completion or cancellation.
1034  * @cookie: Arbitrary value to be passed to @complete.
1035  *
1036  * This function does not sleep and therefore may be called in atomic
1037  * context.  It will fail if event queues are disabled or if MCDI
1038  * event completions have been disabled due to an error.
1039  *
1040  * If it succeeds, the @complete function will be called exactly once
1041  * in atomic context, when one of the following occurs:
1042  * (a) the completion event is received (in NAPI context)
1043  * (b) event queues are disabled (in the process that disables them)
1044  * (c) the request times-out (in timer context)
1045  */
1046 int
1047 efx_mcdi_rpc_async(struct efx_nic *efx, unsigned int cmd,
1048                    const efx_dword_t *inbuf, size_t inlen, size_t outlen,
1049                    efx_mcdi_async_completer *complete, unsigned long cookie)
1050 {
1051         return _efx_mcdi_rpc_async(efx, cmd, inbuf, inlen, outlen, complete,
1052                                    cookie, false);
1053 }
1054 
1055 int efx_mcdi_rpc_async_quiet(struct efx_nic *efx, unsigned int cmd,
1056                              const efx_dword_t *inbuf, size_t inlen,
1057                              size_t outlen, efx_mcdi_async_completer *complete,
1058                              unsigned long cookie)
1059 {
1060         return _efx_mcdi_rpc_async(efx, cmd, inbuf, inlen, outlen, complete,
1061                                    cookie, true);
1062 }
1063 
1064 int efx_mcdi_rpc_finish(struct efx_nic *efx, unsigned cmd, size_t inlen,
1065                         efx_dword_t *outbuf, size_t outlen,
1066                         size_t *outlen_actual)
1067 {
1068         return _efx_mcdi_rpc_finish(efx, cmd, inlen, outbuf, outlen,
1069                                     outlen_actual, false, NULL, NULL);
1070 }
1071 
1072 int efx_mcdi_rpc_finish_quiet(struct efx_nic *efx, unsigned cmd, size_t inlen,
1073                               efx_dword_t *outbuf, size_t outlen,
1074                               size_t *outlen_actual)
1075 {
1076         return _efx_mcdi_rpc_finish(efx, cmd, inlen, outbuf, outlen,
1077                                     outlen_actual, true, NULL, NULL);
1078 }
1079 
1080 void efx_mcdi_display_error(struct efx_nic *efx, unsigned cmd,
1081                             size_t inlen, efx_dword_t *outbuf,
1082                             size_t outlen, int rc)
1083 {
1084         int code = 0, err_arg = 0;
1085 
1086         if (outlen >= MC_CMD_ERR_CODE_OFST + 4)
1087                 code = MCDI_DWORD(outbuf, ERR_CODE);
1088         if (outlen >= MC_CMD_ERR_ARG_OFST + 4)
1089                 err_arg = MCDI_DWORD(outbuf, ERR_ARG);
1090         netif_cond_dbg(efx, hw, efx->net_dev, rc == -EPERM, err,
1091                        "MC command 0x%x inlen %zu failed rc=%d (raw=%d) arg=%d\n",
1092                        cmd, inlen, rc, code, err_arg);
1093 }
1094 
1095 /* Switch to polled MCDI completions.  This can be called in various
1096  * error conditions with various locks held, so it must be lockless.
1097  * Caller is responsible for flushing asynchronous requests later.
1098  */
1099 void efx_mcdi_mode_poll(struct efx_nic *efx)
1100 {
1101         struct efx_mcdi_iface *mcdi;
1102 
1103         if (!efx->mcdi)
1104                 return;
1105 
1106         mcdi = efx_mcdi(efx);
1107         /* If already in polling mode, nothing to do.
1108          * If in fail-fast state, don't switch to polled completion.
1109          * FLR recovery will do that later.
1110          */
1111         if (mcdi->mode == MCDI_MODE_POLL || mcdi->mode == MCDI_MODE_FAIL)
1112                 return;
1113 
1114         /* We can switch from event completion to polled completion, because
1115          * mcdi requests are always completed in shared memory. We do this by
1116          * switching the mode to POLL'd then completing the request.
1117          * efx_mcdi_await_completion() will then call efx_mcdi_poll().
1118          *
1119          * We need an smp_wmb() to synchronise with efx_mcdi_await_completion(),
1120          * which efx_mcdi_complete_sync() provides for us.
1121          */
1122         mcdi->mode = MCDI_MODE_POLL;
1123 
1124         efx_mcdi_complete_sync(mcdi);
1125 }
1126 
1127 /* Flush any running or queued asynchronous requests, after event processing
1128  * is stopped
1129  */
1130 void efx_mcdi_flush_async(struct efx_nic *efx)
1131 {
1132         struct efx_mcdi_async_param *async, *next;
1133         struct efx_mcdi_iface *mcdi;
1134 
1135         if (!efx->mcdi)
1136                 return;
1137 
1138         mcdi = efx_mcdi(efx);
1139 
1140         /* We must be in poll or fail mode so no more requests can be queued */
1141         BUG_ON(mcdi->mode == MCDI_MODE_EVENTS);
1142 
1143         del_timer_sync(&mcdi->async_timer);
1144 
1145         /* If a request is still running, make sure we give the MC
1146          * time to complete it so that the response won't overwrite our
1147          * next request.
1148          */
1149         if (mcdi->state == MCDI_STATE_RUNNING_ASYNC) {
1150                 efx_mcdi_poll(efx);
1151                 mcdi->state = MCDI_STATE_QUIESCENT;
1152         }
1153 
1154         /* Nothing else will access the async list now, so it is safe
1155          * to walk it without holding async_lock.  If we hold it while
1156          * calling a completer then lockdep may warn that we have
1157          * acquired locks in the wrong order.
1158          */
1159         list_for_each_entry_safe(async, next, &mcdi->async_list, list) {
1160                 if (async->complete)
1161                         async->complete(efx, async->cookie, -ENETDOWN, NULL, 0);
1162                 list_del(&async->list);
1163                 kfree(async);
1164         }
1165 }
1166 
1167 void efx_mcdi_mode_event(struct efx_nic *efx)
1168 {
1169         struct efx_mcdi_iface *mcdi;
1170 
1171         if (!efx->mcdi)
1172                 return;
1173 
1174         mcdi = efx_mcdi(efx);
1175         /* If already in event completion mode, nothing to do.
1176          * If in fail-fast state, don't switch to event completion.  FLR
1177          * recovery will do that later.
1178          */
1179         if (mcdi->mode == MCDI_MODE_EVENTS || mcdi->mode == MCDI_MODE_FAIL)
1180                 return;
1181 
1182         /* We can't switch from polled to event completion in the middle of a
1183          * request, because the completion method is specified in the request.
1184          * So acquire the interface to serialise the requestors. We don't need
1185          * to acquire the iface_lock to change the mode here, but we do need a
1186          * write memory barrier ensure that efx_mcdi_rpc() sees it, which
1187          * efx_mcdi_acquire() provides.
1188          */
1189         efx_mcdi_acquire_sync(mcdi);
1190         mcdi->mode = MCDI_MODE_EVENTS;
1191         efx_mcdi_release(mcdi);
1192 }
1193 
1194 static void efx_mcdi_ev_death(struct efx_nic *efx, int rc)
1195 {
1196         struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
1197 
1198         /* If there is an outstanding MCDI request, it has been terminated
1199          * either by a BADASSERT or REBOOT event. If the mcdi interface is
1200          * in polled mode, then do nothing because the MC reboot handler will
1201          * set the header correctly. However, if the mcdi interface is waiting
1202          * for a CMDDONE event it won't receive it [and since all MCDI events
1203          * are sent to the same queue, we can't be racing with
1204          * efx_mcdi_ev_cpl()]
1205          *
1206          * If there is an outstanding asynchronous request, we can't
1207          * complete it now (efx_mcdi_complete() would deadlock).  The
1208          * reset process will take care of this.
1209          *
1210          * There's a race here with efx_mcdi_send_request(), because
1211          * we might receive a REBOOT event *before* the request has
1212          * been copied out. In polled mode (during startup) this is
1213          * irrelevant, because efx_mcdi_complete_sync() is ignored. In
1214          * event mode, this condition is just an edge-case of
1215          * receiving a REBOOT event after posting the MCDI
1216          * request. Did the mc reboot before or after the copyout? The
1217          * best we can do always is just return failure.
1218          *
1219          * If there is an outstanding proxy response expected it is not going
1220          * to arrive. We should thus abort it.
1221          */
1222         spin_lock(&mcdi->iface_lock);
1223         efx_mcdi_proxy_abort(mcdi);
1224 
1225         if (efx_mcdi_complete_sync(mcdi)) {
1226                 if (mcdi->mode == MCDI_MODE_EVENTS) {
1227                         mcdi->resprc = rc;
1228                         mcdi->resp_hdr_len = 0;
1229                         mcdi->resp_data_len = 0;
1230                         ++mcdi->credits;
1231                 }
1232         } else {
1233                 int count;
1234 
1235                 /* Consume the status word since efx_mcdi_rpc_finish() won't */
1236                 for (count = 0; count < MCDI_STATUS_DELAY_COUNT; ++count) {
1237                         rc = efx_mcdi_poll_reboot(efx);
1238                         if (rc)
1239                                 break;
1240                         udelay(MCDI_STATUS_DELAY_US);
1241                 }
1242 
1243                 /* On EF10, a CODE_MC_REBOOT event can be received without the
1244                  * reboot detection in efx_mcdi_poll_reboot() being triggered.
1245                  * If zero was returned from the final call to
1246                  * efx_mcdi_poll_reboot(), the MC reboot wasn't noticed but the
1247                  * MC has definitely rebooted so prepare for the reset.
1248                  */
1249                 if (!rc && efx->type->mcdi_reboot_detected)
1250                         efx->type->mcdi_reboot_detected(efx);
1251 
1252                 mcdi->new_epoch = true;
1253 
1254                 /* Nobody was waiting for an MCDI request, so trigger a reset */
1255                 efx_schedule_reset(efx, RESET_TYPE_MC_FAILURE);
1256         }
1257 
1258         spin_unlock(&mcdi->iface_lock);
1259 }
1260 
1261 /* The MC is going down in to BIST mode. set the BIST flag to block
1262  * new MCDI, cancel any outstanding MCDI and and schedule a BIST-type reset
1263  * (which doesn't actually execute a reset, it waits for the controlling
1264  * function to reset it).
1265  */
1266 static void efx_mcdi_ev_bist(struct efx_nic *efx)
1267 {
1268         struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
1269 
1270         spin_lock(&mcdi->iface_lock);
1271         efx->mc_bist_for_other_fn = true;
1272         efx_mcdi_proxy_abort(mcdi);
1273 
1274         if (efx_mcdi_complete_sync(mcdi)) {
1275                 if (mcdi->mode == MCDI_MODE_EVENTS) {
1276                         mcdi->resprc = -EIO;
1277                         mcdi->resp_hdr_len = 0;
1278                         mcdi->resp_data_len = 0;
1279                         ++mcdi->credits;
1280                 }
1281         }
1282         mcdi->new_epoch = true;
1283         efx_schedule_reset(efx, RESET_TYPE_MC_BIST);
1284         spin_unlock(&mcdi->iface_lock);
1285 }
1286 
1287 /* MCDI timeouts seen, so make all MCDI calls fail-fast and issue an FLR to try
1288  * to recover.
1289  */
1290 static void efx_mcdi_abandon(struct efx_nic *efx)
1291 {
1292         struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
1293 
1294         if (xchg(&mcdi->mode, MCDI_MODE_FAIL) == MCDI_MODE_FAIL)
1295                 return; /* it had already been done */
1296         netif_dbg(efx, hw, efx->net_dev, "MCDI is timing out; trying to recover\n");
1297         efx_schedule_reset(efx, RESET_TYPE_MCDI_TIMEOUT);
1298 }
1299 
1300 /* Called from efx_farch_ev_process and efx_ef10_ev_process for MCDI events */
1301 void efx_mcdi_process_event(struct efx_channel *channel,
1302                             efx_qword_t *event)
1303 {
1304         struct efx_nic *efx = channel->efx;
1305         int code = EFX_QWORD_FIELD(*event, MCDI_EVENT_CODE);
1306         u32 data = EFX_QWORD_FIELD(*event, MCDI_EVENT_DATA);
1307 
1308         switch (code) {
1309         case MCDI_EVENT_CODE_BADSSERT:
1310                 netif_err(efx, hw, efx->net_dev,
1311                           "MC watchdog or assertion failure at 0x%x\n", data);
1312                 efx_mcdi_ev_death(efx, -EINTR);
1313                 break;
1314 
1315         case MCDI_EVENT_CODE_PMNOTICE:
1316                 netif_info(efx, wol, efx->net_dev, "MCDI PM event.\n");
1317                 break;
1318 
1319         case MCDI_EVENT_CODE_CMDDONE:
1320                 efx_mcdi_ev_cpl(efx,
1321                                 MCDI_EVENT_FIELD(*event, CMDDONE_SEQ),
1322                                 MCDI_EVENT_FIELD(*event, CMDDONE_DATALEN),
1323                                 MCDI_EVENT_FIELD(*event, CMDDONE_ERRNO));
1324                 break;
1325 
1326         case MCDI_EVENT_CODE_LINKCHANGE:
1327                 efx_mcdi_process_link_change(efx, event);
1328                 break;
1329         case MCDI_EVENT_CODE_SENSOREVT:
1330                 efx_mcdi_sensor_event(efx, event);
1331                 break;
1332         case MCDI_EVENT_CODE_SCHEDERR:
1333                 netif_dbg(efx, hw, efx->net_dev,
1334                           "MC Scheduler alert (0x%x)\n", data);
1335                 break;
1336         case MCDI_EVENT_CODE_REBOOT:
1337         case MCDI_EVENT_CODE_MC_REBOOT:
1338                 netif_info(efx, hw, efx->net_dev, "MC Reboot\n");
1339                 efx_mcdi_ev_death(efx, -EIO);
1340                 break;
1341         case MCDI_EVENT_CODE_MC_BIST:
1342                 netif_info(efx, hw, efx->net_dev, "MC entered BIST mode\n");
1343                 efx_mcdi_ev_bist(efx);
1344                 break;
1345         case MCDI_EVENT_CODE_MAC_STATS_DMA:
1346                 /* MAC stats are gather lazily.  We can ignore this. */
1347                 break;
1348         case MCDI_EVENT_CODE_FLR:
1349                 if (efx->type->sriov_flr)
1350                         efx->type->sriov_flr(efx,
1351                                              MCDI_EVENT_FIELD(*event, FLR_VF));
1352                 break;
1353         case MCDI_EVENT_CODE_PTP_RX:
1354         case MCDI_EVENT_CODE_PTP_FAULT:
1355         case MCDI_EVENT_CODE_PTP_PPS:
1356                 efx_ptp_event(efx, event);
1357                 break;
1358         case MCDI_EVENT_CODE_PTP_TIME:
1359                 efx_time_sync_event(channel, event);
1360                 break;
1361         case MCDI_EVENT_CODE_TX_FLUSH:
1362         case MCDI_EVENT_CODE_RX_FLUSH:
1363                 /* Two flush events will be sent: one to the same event
1364                  * queue as completions, and one to event queue 0.
1365                  * In the latter case the {RX,TX}_FLUSH_TO_DRIVER
1366                  * flag will be set, and we should ignore the event
1367                  * because we want to wait for all completions.
1368                  */
1369                 BUILD_BUG_ON(MCDI_EVENT_TX_FLUSH_TO_DRIVER_LBN !=
1370                              MCDI_EVENT_RX_FLUSH_TO_DRIVER_LBN);
1371                 if (!MCDI_EVENT_FIELD(*event, TX_FLUSH_TO_DRIVER))
1372                         efx_ef10_handle_drain_event(efx);
1373                 break;
1374         case MCDI_EVENT_CODE_TX_ERR:
1375         case MCDI_EVENT_CODE_RX_ERR:
1376                 netif_err(efx, hw, efx->net_dev,
1377                           "%s DMA error (event: "EFX_QWORD_FMT")\n",
1378                           code == MCDI_EVENT_CODE_TX_ERR ? "TX" : "RX",
1379                           EFX_QWORD_VAL(*event));
1380                 efx_schedule_reset(efx, RESET_TYPE_DMA_ERROR);
1381                 break;
1382         case MCDI_EVENT_CODE_PROXY_RESPONSE:
1383                 efx_mcdi_ev_proxy_response(efx,
1384                                 MCDI_EVENT_FIELD(*event, PROXY_RESPONSE_HANDLE),
1385                                 MCDI_EVENT_FIELD(*event, PROXY_RESPONSE_RC));
1386                 break;
1387         default:
1388                 netif_err(efx, hw, efx->net_dev,
1389                           "Unknown MCDI event " EFX_QWORD_FMT "\n",
1390                           EFX_QWORD_VAL(*event));
1391         }
1392 }
1393 
1394 /**************************************************************************
1395  *
1396  * Specific request functions
1397  *
1398  **************************************************************************
1399  */
1400 
1401 void efx_mcdi_print_fwver(struct efx_nic *efx, char *buf, size_t len)
1402 {
1403         MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_VERSION_OUT_LEN);
1404         size_t outlength;
1405         const __le16 *ver_words;
1406         size_t offset;
1407         int rc;
1408 
1409         BUILD_BUG_ON(MC_CMD_GET_VERSION_IN_LEN != 0);
1410         rc = efx_mcdi_rpc(efx, MC_CMD_GET_VERSION, NULL, 0,
1411                           outbuf, sizeof(outbuf), &outlength);
1412         if (rc)
1413                 goto fail;
1414         if (outlength < MC_CMD_GET_VERSION_OUT_LEN) {
1415                 rc = -EIO;
1416                 goto fail;
1417         }
1418 
1419         ver_words = (__le16 *)MCDI_PTR(outbuf, GET_VERSION_OUT_VERSION);
1420         offset = snprintf(buf, len, "%u.%u.%u.%u",
1421                           le16_to_cpu(ver_words[0]), le16_to_cpu(ver_words[1]),
1422                           le16_to_cpu(ver_words[2]), le16_to_cpu(ver_words[3]));
1423 
1424         /* EF10 may have multiple datapath firmware variants within a
1425          * single version.  Report which variants are running.
1426          */
1427         if (efx_nic_rev(efx) >= EFX_REV_HUNT_A0) {
1428                 struct efx_ef10_nic_data *nic_data = efx->nic_data;
1429 
1430                 offset += snprintf(buf + offset, len - offset, " rx%x tx%x",
1431                                    nic_data->rx_dpcpu_fw_id,
1432                                    nic_data->tx_dpcpu_fw_id);
1433 
1434                 /* It's theoretically possible for the string to exceed 31
1435                  * characters, though in practice the first three version
1436                  * components are short enough that this doesn't happen.
1437                  */
1438                 if (WARN_ON(offset >= len))
1439                         buf[0] = 0;
1440         }
1441 
1442         return;
1443 
1444 fail:
1445         netif_err(efx, probe, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
1446         buf[0] = 0;
1447 }
1448 
1449 static int efx_mcdi_drv_attach(struct efx_nic *efx, bool driver_operating,
1450                                bool *was_attached)
1451 {
1452         MCDI_DECLARE_BUF(inbuf, MC_CMD_DRV_ATTACH_IN_LEN);
1453         MCDI_DECLARE_BUF(outbuf, MC_CMD_DRV_ATTACH_EXT_OUT_LEN);
1454         size_t outlen;
1455         int rc;
1456 
1457         MCDI_SET_DWORD(inbuf, DRV_ATTACH_IN_NEW_STATE,
1458                        driver_operating ? 1 : 0);
1459         MCDI_SET_DWORD(inbuf, DRV_ATTACH_IN_UPDATE, 1);
1460         MCDI_SET_DWORD(inbuf, DRV_ATTACH_IN_FIRMWARE_ID, MC_CMD_FW_LOW_LATENCY);
1461 
1462         rc = efx_mcdi_rpc_quiet(efx, MC_CMD_DRV_ATTACH, inbuf, sizeof(inbuf),
1463                                 outbuf, sizeof(outbuf), &outlen);
1464         /* If we're not the primary PF, trying to ATTACH with a FIRMWARE_ID
1465          * specified will fail with EPERM, and we have to tell the MC we don't
1466          * care what firmware we get.
1467          */
1468         if (rc == -EPERM) {
1469                 netif_dbg(efx, probe, efx->net_dev,
1470                           "efx_mcdi_drv_attach with fw-variant setting failed EPERM, trying without it\n");
1471                 MCDI_SET_DWORD(inbuf, DRV_ATTACH_IN_FIRMWARE_ID,
1472                                MC_CMD_FW_DONT_CARE);
1473                 rc = efx_mcdi_rpc_quiet(efx, MC_CMD_DRV_ATTACH, inbuf,
1474                                         sizeof(inbuf), outbuf, sizeof(outbuf),
1475                                         &outlen);
1476         }
1477         if (rc) {
1478                 efx_mcdi_display_error(efx, MC_CMD_DRV_ATTACH, sizeof(inbuf),
1479                                        outbuf, outlen, rc);
1480                 goto fail;
1481         }
1482         if (outlen < MC_CMD_DRV_ATTACH_OUT_LEN) {
1483                 rc = -EIO;
1484                 goto fail;
1485         }
1486 
1487         if (driver_operating) {
1488                 if (outlen >= MC_CMD_DRV_ATTACH_EXT_OUT_LEN) {
1489                         efx->mcdi->fn_flags =
1490                                 MCDI_DWORD(outbuf,
1491                                            DRV_ATTACH_EXT_OUT_FUNC_FLAGS);
1492                 } else {
1493                         /* Synthesise flags for Siena */
1494                         efx->mcdi->fn_flags =
1495                                 1 << MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_LINKCTRL |
1496                                 1 << MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_TRUSTED |
1497                                 (efx_port_num(efx) == 0) <<
1498                                 MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_PRIMARY;
1499                 }
1500         }
1501 
1502         /* We currently assume we have control of the external link
1503          * and are completely trusted by firmware.  Abort probing
1504          * if that's not true for this function.
1505          */
1506 
1507         if (was_attached != NULL)
1508                 *was_attached = MCDI_DWORD(outbuf, DRV_ATTACH_OUT_OLD_STATE);
1509         return 0;
1510 
1511 fail:
1512         netif_err(efx, probe, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
1513         return rc;
1514 }
1515 
1516 int efx_mcdi_get_board_cfg(struct efx_nic *efx, u8 *mac_address,
1517                            u16 *fw_subtype_list, u32 *capabilities)
1518 {
1519         MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_BOARD_CFG_OUT_LENMAX);
1520         size_t outlen, i;
1521         int port_num = efx_port_num(efx);
1522         int rc;
1523 
1524         BUILD_BUG_ON(MC_CMD_GET_BOARD_CFG_IN_LEN != 0);
1525         /* we need __aligned(2) for ether_addr_copy */
1526         BUILD_BUG_ON(MC_CMD_GET_BOARD_CFG_OUT_MAC_ADDR_BASE_PORT0_OFST & 1);
1527         BUILD_BUG_ON(MC_CMD_GET_BOARD_CFG_OUT_MAC_ADDR_BASE_PORT1_OFST & 1);
1528 
1529         rc = efx_mcdi_rpc(efx, MC_CMD_GET_BOARD_CFG, NULL, 0,
1530                           outbuf, sizeof(outbuf), &outlen);
1531         if (rc)
1532                 goto fail;
1533 
1534         if (outlen < MC_CMD_GET_BOARD_CFG_OUT_LENMIN) {
1535                 rc = -EIO;
1536                 goto fail;
1537         }
1538 
1539         if (mac_address)
1540                 ether_addr_copy(mac_address,
1541                                 port_num ?
1542                                 MCDI_PTR(outbuf, GET_BOARD_CFG_OUT_MAC_ADDR_BASE_PORT1) :
1543                                 MCDI_PTR(outbuf, GET_BOARD_CFG_OUT_MAC_ADDR_BASE_PORT0));
1544         if (fw_subtype_list) {
1545                 for (i = 0;
1546                      i < MCDI_VAR_ARRAY_LEN(outlen,
1547                                             GET_BOARD_CFG_OUT_FW_SUBTYPE_LIST);
1548                      i++)
1549                         fw_subtype_list[i] = MCDI_ARRAY_WORD(
1550                                 outbuf, GET_BOARD_CFG_OUT_FW_SUBTYPE_LIST, i);
1551                 for (; i < MC_CMD_GET_BOARD_CFG_OUT_FW_SUBTYPE_LIST_MAXNUM; i++)
1552                         fw_subtype_list[i] = 0;
1553         }
1554         if (capabilities) {
1555                 if (port_num)
1556                         *capabilities = MCDI_DWORD(outbuf,
1557                                         GET_BOARD_CFG_OUT_CAPABILITIES_PORT1);
1558                 else
1559                         *capabilities = MCDI_DWORD(outbuf,
1560                                         GET_BOARD_CFG_OUT_CAPABILITIES_PORT0);
1561         }
1562 
1563         return 0;
1564 
1565 fail:
1566         netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d len=%d\n",
1567                   __func__, rc, (int)outlen);
1568 
1569         return rc;
1570 }
1571 
1572 int efx_mcdi_log_ctrl(struct efx_nic *efx, bool evq, bool uart, u32 dest_evq)
1573 {
1574         MCDI_DECLARE_BUF(inbuf, MC_CMD_LOG_CTRL_IN_LEN);
1575         u32 dest = 0;
1576         int rc;
1577 
1578         if (uart)
1579                 dest |= MC_CMD_LOG_CTRL_IN_LOG_DEST_UART;
1580         if (evq)
1581                 dest |= MC_CMD_LOG_CTRL_IN_LOG_DEST_EVQ;
1582 
1583         MCDI_SET_DWORD(inbuf, LOG_CTRL_IN_LOG_DEST, dest);
1584         MCDI_SET_DWORD(inbuf, LOG_CTRL_IN_LOG_DEST_EVQ, dest_evq);
1585 
1586         BUILD_BUG_ON(MC_CMD_LOG_CTRL_OUT_LEN != 0);
1587 
1588         rc = efx_mcdi_rpc(efx, MC_CMD_LOG_CTRL, inbuf, sizeof(inbuf),
1589                           NULL, 0, NULL);
1590         return rc;
1591 }
1592 
1593 int efx_mcdi_nvram_types(struct efx_nic *efx, u32 *nvram_types_out)
1594 {
1595         MCDI_DECLARE_BUF(outbuf, MC_CMD_NVRAM_TYPES_OUT_LEN);
1596         size_t outlen;
1597         int rc;
1598 
1599         BUILD_BUG_ON(MC_CMD_NVRAM_TYPES_IN_LEN != 0);
1600 
1601         rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_TYPES, NULL, 0,
1602                           outbuf, sizeof(outbuf), &outlen);
1603         if (rc)
1604                 goto fail;
1605         if (outlen < MC_CMD_NVRAM_TYPES_OUT_LEN) {
1606                 rc = -EIO;
1607                 goto fail;
1608         }
1609 
1610         *nvram_types_out = MCDI_DWORD(outbuf, NVRAM_TYPES_OUT_TYPES);
1611         return 0;
1612 
1613 fail:
1614         netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n",
1615                   __func__, rc);
1616         return rc;
1617 }
1618 
1619 int efx_mcdi_nvram_info(struct efx_nic *efx, unsigned int type,
1620                         size_t *size_out, size_t *erase_size_out,
1621                         bool *protected_out)
1622 {
1623         MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_INFO_IN_LEN);
1624         MCDI_DECLARE_BUF(outbuf, MC_CMD_NVRAM_INFO_OUT_LEN);
1625         size_t outlen;
1626         int rc;
1627 
1628         MCDI_SET_DWORD(inbuf, NVRAM_INFO_IN_TYPE, type);
1629 
1630         rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_INFO, inbuf, sizeof(inbuf),
1631                           outbuf, sizeof(outbuf), &outlen);
1632         if (rc)
1633                 goto fail;
1634         if (outlen < MC_CMD_NVRAM_INFO_OUT_LEN) {
1635                 rc = -EIO;
1636                 goto fail;
1637         }
1638 
1639         *size_out = MCDI_DWORD(outbuf, NVRAM_INFO_OUT_SIZE);
1640         *erase_size_out = MCDI_DWORD(outbuf, NVRAM_INFO_OUT_ERASESIZE);
1641         *protected_out = !!(MCDI_DWORD(outbuf, NVRAM_INFO_OUT_FLAGS) &
1642                                 (1 << MC_CMD_NVRAM_INFO_OUT_PROTECTED_LBN));
1643         return 0;
1644 
1645 fail:
1646         netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
1647         return rc;
1648 }
1649 
1650 static int efx_mcdi_nvram_test(struct efx_nic *efx, unsigned int type)
1651 {
1652         MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_TEST_IN_LEN);
1653         MCDI_DECLARE_BUF(outbuf, MC_CMD_NVRAM_TEST_OUT_LEN);
1654         int rc;
1655 
1656         MCDI_SET_DWORD(inbuf, NVRAM_TEST_IN_TYPE, type);
1657 
1658         rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_TEST, inbuf, sizeof(inbuf),
1659                           outbuf, sizeof(outbuf), NULL);
1660         if (rc)
1661                 return rc;
1662 
1663         switch (MCDI_DWORD(outbuf, NVRAM_TEST_OUT_RESULT)) {
1664         case MC_CMD_NVRAM_TEST_PASS:
1665         case MC_CMD_NVRAM_TEST_NOTSUPP:
1666                 return 0;
1667         default:
1668                 return -EIO;
1669         }
1670 }
1671 
1672 int efx_mcdi_nvram_test_all(struct efx_nic *efx)
1673 {
1674         u32 nvram_types;
1675         unsigned int type;
1676         int rc;
1677 
1678         rc = efx_mcdi_nvram_types(efx, &nvram_types);
1679         if (rc)
1680                 goto fail1;
1681 
1682         type = 0;
1683         while (nvram_types != 0) {
1684                 if (nvram_types & 1) {
1685                         rc = efx_mcdi_nvram_test(efx, type);
1686                         if (rc)
1687                                 goto fail2;
1688                 }
1689                 type++;
1690                 nvram_types >>= 1;
1691         }
1692 
1693         return 0;
1694 
1695 fail2:
1696         netif_err(efx, hw, efx->net_dev, "%s: failed type=%u\n",
1697                   __func__, type);
1698 fail1:
1699         netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
1700         return rc;
1701 }
1702 
1703 /* Returns 1 if an assertion was read, 0 if no assertion had fired,
1704  * negative on error.
1705  */
1706 static int efx_mcdi_read_assertion(struct efx_nic *efx)
1707 {
1708         MCDI_DECLARE_BUF(inbuf, MC_CMD_GET_ASSERTS_IN_LEN);
1709         MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_ASSERTS_OUT_LEN);
1710         unsigned int flags, index;
1711         const char *reason;
1712         size_t outlen;
1713         int retry;
1714         int rc;
1715 
1716         /* Attempt to read any stored assertion state before we reboot
1717          * the mcfw out of the assertion handler. Retry twice, once
1718          * because a boot-time assertion might cause this command to fail
1719          * with EINTR. And once again because GET_ASSERTS can race with
1720          * MC_CMD_REBOOT running on the other port. */
1721         retry = 2;
1722         do {
1723                 MCDI_SET_DWORD(inbuf, GET_ASSERTS_IN_CLEAR, 1);
1724                 rc = efx_mcdi_rpc_quiet(efx, MC_CMD_GET_ASSERTS,
1725                                         inbuf, MC_CMD_GET_ASSERTS_IN_LEN,
1726                                         outbuf, sizeof(outbuf), &outlen);
1727                 if (rc == -EPERM)
1728                         return 0;
1729         } while ((rc == -EINTR || rc == -EIO) && retry-- > 0);
1730 
1731         if (rc) {
1732                 efx_mcdi_display_error(efx, MC_CMD_GET_ASSERTS,
1733                                        MC_CMD_GET_ASSERTS_IN_LEN, outbuf,
1734                                        outlen, rc);
1735                 return rc;
1736         }
1737         if (outlen < MC_CMD_GET_ASSERTS_OUT_LEN)
1738                 return -EIO;
1739 
1740         /* Print out any recorded assertion state */
1741         flags = MCDI_DWORD(outbuf, GET_ASSERTS_OUT_GLOBAL_FLAGS);
1742         if (flags == MC_CMD_GET_ASSERTS_FLAGS_NO_FAILS)
1743                 return 0;
1744 
1745         reason = (flags == MC_CMD_GET_ASSERTS_FLAGS_SYS_FAIL)
1746                 ? "system-level assertion"
1747                 : (flags == MC_CMD_GET_ASSERTS_FLAGS_THR_FAIL)
1748                 ? "thread-level assertion"
1749                 : (flags == MC_CMD_GET_ASSERTS_FLAGS_WDOG_FIRED)
1750                 ? "watchdog reset"
1751                 : "unknown assertion";
1752         netif_err(efx, hw, efx->net_dev,
1753                   "MCPU %s at PC = 0x%.8x in thread 0x%.8x\n", reason,
1754                   MCDI_DWORD(outbuf, GET_ASSERTS_OUT_SAVED_PC_OFFS),
1755                   MCDI_DWORD(outbuf, GET_ASSERTS_OUT_THREAD_OFFS));
1756 
1757         /* Print out the registers */
1758         for (index = 0;
1759              index < MC_CMD_GET_ASSERTS_OUT_GP_REGS_OFFS_NUM;
1760              index++)
1761                 netif_err(efx, hw, efx->net_dev, "R%.2d (?): 0x%.8x\n",
1762                           1 + index,
1763                           MCDI_ARRAY_DWORD(outbuf, GET_ASSERTS_OUT_GP_REGS_OFFS,
1764                                            index));
1765 
1766         return 1;
1767 }
1768 
1769 static int efx_mcdi_exit_assertion(struct efx_nic *efx)
1770 {
1771         MCDI_DECLARE_BUF(inbuf, MC_CMD_REBOOT_IN_LEN);
1772         int rc;
1773 
1774         /* If the MC is running debug firmware, it might now be
1775          * waiting for a debugger to attach, but we just want it to
1776          * reboot.  We set a flag that makes the command a no-op if it
1777          * has already done so.
1778          * The MCDI will thus return either 0 or -EIO.
1779          */
1780         BUILD_BUG_ON(MC_CMD_REBOOT_OUT_LEN != 0);
1781         MCDI_SET_DWORD(inbuf, REBOOT_IN_FLAGS,
1782                        MC_CMD_REBOOT_FLAGS_AFTER_ASSERTION);
1783         rc = efx_mcdi_rpc_quiet(efx, MC_CMD_REBOOT, inbuf, MC_CMD_REBOOT_IN_LEN,
1784                                 NULL, 0, NULL);
1785         if (rc == -EIO)
1786                 rc = 0;
1787         if (rc)
1788                 efx_mcdi_display_error(efx, MC_CMD_REBOOT, MC_CMD_REBOOT_IN_LEN,
1789                                        NULL, 0, rc);
1790         return rc;
1791 }
1792 
1793 int efx_mcdi_handle_assertion(struct efx_nic *efx)
1794 {
1795         int rc;
1796 
1797         rc = efx_mcdi_read_assertion(efx);
1798         if (rc <= 0)
1799                 return rc;
1800 
1801         return efx_mcdi_exit_assertion(efx);
1802 }
1803 
1804 void efx_mcdi_set_id_led(struct efx_nic *efx, enum efx_led_mode mode)
1805 {
1806         MCDI_DECLARE_BUF(inbuf, MC_CMD_SET_ID_LED_IN_LEN);
1807         int rc;
1808 
1809         BUILD_BUG_ON(EFX_LED_OFF != MC_CMD_LED_OFF);
1810         BUILD_BUG_ON(EFX_LED_ON != MC_CMD_LED_ON);
1811         BUILD_BUG_ON(EFX_LED_DEFAULT != MC_CMD_LED_DEFAULT);
1812 
1813         BUILD_BUG_ON(MC_CMD_SET_ID_LED_OUT_LEN != 0);
1814 
1815         MCDI_SET_DWORD(inbuf, SET_ID_LED_IN_STATE, mode);
1816 
1817         rc = efx_mcdi_rpc(efx, MC_CMD_SET_ID_LED, inbuf, sizeof(inbuf),
1818                           NULL, 0, NULL);
1819 }
1820 
1821 static int efx_mcdi_reset_func(struct efx_nic *efx)
1822 {
1823         MCDI_DECLARE_BUF(inbuf, MC_CMD_ENTITY_RESET_IN_LEN);
1824         int rc;
1825 
1826         BUILD_BUG_ON(MC_CMD_ENTITY_RESET_OUT_LEN != 0);
1827         MCDI_POPULATE_DWORD_1(inbuf, ENTITY_RESET_IN_FLAG,
1828                               ENTITY_RESET_IN_FUNCTION_RESOURCE_RESET, 1);
1829         rc = efx_mcdi_rpc(efx, MC_CMD_ENTITY_RESET, inbuf, sizeof(inbuf),
1830                           NULL, 0, NULL);
1831         return rc;
1832 }
1833 
1834 static int efx_mcdi_reset_mc(struct efx_nic *efx)
1835 {
1836         MCDI_DECLARE_BUF(inbuf, MC_CMD_REBOOT_IN_LEN);
1837         int rc;
1838 
1839         BUILD_BUG_ON(MC_CMD_REBOOT_OUT_LEN != 0);
1840         MCDI_SET_DWORD(inbuf, REBOOT_IN_FLAGS, 0);
1841         rc = efx_mcdi_rpc(efx, MC_CMD_REBOOT, inbuf, sizeof(inbuf),
1842                           NULL, 0, NULL);
1843         /* White is black, and up is down */
1844         if (rc == -EIO)
1845                 return 0;
1846         if (rc == 0)
1847                 rc = -EIO;
1848         return rc;
1849 }
1850 
1851 enum reset_type efx_mcdi_map_reset_reason(enum reset_type reason)
1852 {
1853         return RESET_TYPE_RECOVER_OR_ALL;
1854 }
1855 
1856 int efx_mcdi_reset(struct efx_nic *efx, enum reset_type method)
1857 {
1858         int rc;
1859 
1860         /* If MCDI is down, we can't handle_assertion */
1861         if (method == RESET_TYPE_MCDI_TIMEOUT) {
1862                 rc = pci_reset_function(efx->pci_dev);
1863                 if (rc)
1864                         return rc;
1865                 /* Re-enable polled MCDI completion */
1866                 if (efx->mcdi) {
1867                         struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
1868                         mcdi->mode = MCDI_MODE_POLL;
1869                 }
1870                 return 0;
1871         }
1872 
1873         /* Recover from a failed assertion pre-reset */
1874         rc = efx_mcdi_handle_assertion(efx);
1875         if (rc)
1876                 return rc;
1877 
1878         if (method == RESET_TYPE_DATAPATH)
1879                 return 0;
1880         else if (method == RESET_TYPE_WORLD)
1881                 return efx_mcdi_reset_mc(efx);
1882         else
1883                 return efx_mcdi_reset_func(efx);
1884 }
1885 
1886 static int efx_mcdi_wol_filter_set(struct efx_nic *efx, u32 type,
1887                                    const u8 *mac, int *id_out)
1888 {
1889         MCDI_DECLARE_BUF(inbuf, MC_CMD_WOL_FILTER_SET_IN_LEN);
1890         MCDI_DECLARE_BUF(outbuf, MC_CMD_WOL_FILTER_SET_OUT_LEN);
1891         size_t outlen;
1892         int rc;
1893 
1894         MCDI_SET_DWORD(inbuf, WOL_FILTER_SET_IN_WOL_TYPE, type);
1895         MCDI_SET_DWORD(inbuf, WOL_FILTER_SET_IN_FILTER_MODE,
1896                        MC_CMD_FILTER_MODE_SIMPLE);
1897         ether_addr_copy(MCDI_PTR(inbuf, WOL_FILTER_SET_IN_MAGIC_MAC), mac);
1898 
1899         rc = efx_mcdi_rpc(efx, MC_CMD_WOL_FILTER_SET, inbuf, sizeof(inbuf),
1900                           outbuf, sizeof(outbuf), &outlen);
1901         if (rc)
1902                 goto fail;
1903 
1904         if (outlen < MC_CMD_WOL_FILTER_SET_OUT_LEN) {
1905                 rc = -EIO;
1906                 goto fail;
1907         }
1908 
1909         *id_out = (int)MCDI_DWORD(outbuf, WOL_FILTER_SET_OUT_FILTER_ID);
1910 
1911         return 0;
1912 
1913 fail:
1914         *id_out = -1;
1915         netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
1916         return rc;
1917 
1918 }
1919 
1920 
1921 int
1922 efx_mcdi_wol_filter_set_magic(struct efx_nic *efx,  const u8 *mac, int *id_out)
1923 {
1924         return efx_mcdi_wol_filter_set(efx, MC_CMD_WOL_TYPE_MAGIC, mac, id_out);
1925 }
1926 
1927 
1928 int efx_mcdi_wol_filter_get_magic(struct efx_nic *efx, int *id_out)
1929 {
1930         MCDI_DECLARE_BUF(outbuf, MC_CMD_WOL_FILTER_GET_OUT_LEN);
1931         size_t outlen;
1932         int rc;
1933 
1934         rc = efx_mcdi_rpc(efx, MC_CMD_WOL_FILTER_GET, NULL, 0,
1935                           outbuf, sizeof(outbuf), &outlen);
1936         if (rc)
1937                 goto fail;
1938 
1939         if (outlen < MC_CMD_WOL_FILTER_GET_OUT_LEN) {
1940                 rc = -EIO;
1941                 goto fail;
1942         }
1943 
1944         *id_out = (int)MCDI_DWORD(outbuf, WOL_FILTER_GET_OUT_FILTER_ID);
1945 
1946         return 0;
1947 
1948 fail:
1949         *id_out = -1;
1950         netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
1951         return rc;
1952 }
1953 
1954 
1955 int efx_mcdi_wol_filter_remove(struct efx_nic *efx, int id)
1956 {
1957         MCDI_DECLARE_BUF(inbuf, MC_CMD_WOL_FILTER_REMOVE_IN_LEN);
1958         int rc;
1959 
1960         MCDI_SET_DWORD(inbuf, WOL_FILTER_REMOVE_IN_FILTER_ID, (u32)id);
1961 
1962         rc = efx_mcdi_rpc(efx, MC_CMD_WOL_FILTER_REMOVE, inbuf, sizeof(inbuf),
1963                           NULL, 0, NULL);
1964         return rc;
1965 }
1966 
1967 int efx_mcdi_flush_rxqs(struct efx_nic *efx)
1968 {
1969         struct efx_channel *channel;
1970         struct efx_rx_queue *rx_queue;
1971         MCDI_DECLARE_BUF(inbuf,
1972                          MC_CMD_FLUSH_RX_QUEUES_IN_LEN(EFX_MAX_CHANNELS));
1973         int rc, count;
1974 
1975         BUILD_BUG_ON(EFX_MAX_CHANNELS >
1976                      MC_CMD_FLUSH_RX_QUEUES_IN_QID_OFST_MAXNUM);
1977 
1978         count = 0;
1979         efx_for_each_channel(channel, efx) {
1980                 efx_for_each_channel_rx_queue(rx_queue, channel) {
1981                         if (rx_queue->flush_pending) {
1982                                 rx_queue->flush_pending = false;
1983                                 atomic_dec(&efx->rxq_flush_pending);
1984                                 MCDI_SET_ARRAY_DWORD(
1985                                         inbuf, FLUSH_RX_QUEUES_IN_QID_OFST,
1986                                         count, efx_rx_queue_index(rx_queue));
1987                                 count++;
1988                         }
1989                 }
1990         }
1991 
1992         rc = efx_mcdi_rpc(efx, MC_CMD_FLUSH_RX_QUEUES, inbuf,
1993                           MC_CMD_FLUSH_RX_QUEUES_IN_LEN(count), NULL, 0, NULL);
1994         WARN_ON(rc < 0);
1995 
1996         return rc;
1997 }
1998 
1999 int efx_mcdi_wol_filter_reset(struct efx_nic *efx)
2000 {
2001         int rc;
2002 
2003         rc = efx_mcdi_rpc(efx, MC_CMD_WOL_FILTER_RESET, NULL, 0, NULL, 0, NULL);
2004         return rc;
2005 }
2006 
2007 int efx_mcdi_set_workaround(struct efx_nic *efx, u32 type, bool enabled,
2008                             unsigned int *flags)
2009 {
2010         MCDI_DECLARE_BUF(inbuf, MC_CMD_WORKAROUND_IN_LEN);
2011         MCDI_DECLARE_BUF(outbuf, MC_CMD_WORKAROUND_EXT_OUT_LEN);
2012         size_t outlen;
2013         int rc;
2014 
2015         BUILD_BUG_ON(MC_CMD_WORKAROUND_OUT_LEN != 0);
2016         MCDI_SET_DWORD(inbuf, WORKAROUND_IN_TYPE, type);
2017         MCDI_SET_DWORD(inbuf, WORKAROUND_IN_ENABLED, enabled);
2018         rc = efx_mcdi_rpc(efx, MC_CMD_WORKAROUND, inbuf, sizeof(inbuf),
2019                           outbuf, sizeof(outbuf), &outlen);
2020         if (rc)
2021                 return rc;
2022 
2023         if (!flags)
2024                 return 0;
2025 
2026         if (outlen >= MC_CMD_WORKAROUND_EXT_OUT_LEN)
2027                 *flags = MCDI_DWORD(outbuf, WORKAROUND_EXT_OUT_FLAGS);
2028         else
2029                 *flags = 0;
2030 
2031         return 0;
2032 }
2033 
2034 int efx_mcdi_get_workarounds(struct efx_nic *efx, unsigned int *impl_out,
2035                              unsigned int *enabled_out)
2036 {
2037         MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_WORKAROUNDS_OUT_LEN);
2038         size_t outlen;
2039         int rc;
2040 
2041         rc = efx_mcdi_rpc(efx, MC_CMD_GET_WORKAROUNDS, NULL, 0,
2042                           outbuf, sizeof(outbuf), &outlen);
2043         if (rc)
2044                 goto fail;
2045 
2046         if (outlen < MC_CMD_GET_WORKAROUNDS_OUT_LEN) {
2047                 rc = -EIO;
2048                 goto fail;
2049         }
2050 
2051         if (impl_out)
2052                 *impl_out = MCDI_DWORD(outbuf, GET_WORKAROUNDS_OUT_IMPLEMENTED);
2053 
2054         if (enabled_out)
2055                 *enabled_out = MCDI_DWORD(outbuf, GET_WORKAROUNDS_OUT_ENABLED);
2056 
2057         return 0;
2058 
2059 fail:
2060         /* Older firmware lacks GET_WORKAROUNDS and this isn't especially
2061          * terrifying.  The call site will have to deal with it though.
2062          */
2063         netif_cond_dbg(efx, hw, efx->net_dev, rc == -ENOSYS, err,
2064                        "%s: failed rc=%d\n", __func__, rc);
2065         return rc;
2066 }
2067 
2068 #ifdef CONFIG_SFC_MTD
2069 
2070 #define EFX_MCDI_NVRAM_LEN_MAX 128
2071 
2072 static int efx_mcdi_nvram_update_start(struct efx_nic *efx, unsigned int type)
2073 {
2074         MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_UPDATE_START_V2_IN_LEN);
2075         int rc;
2076 
2077         MCDI_SET_DWORD(inbuf, NVRAM_UPDATE_START_IN_TYPE, type);
2078         MCDI_POPULATE_DWORD_1(inbuf, NVRAM_UPDATE_START_V2_IN_FLAGS,
2079                               NVRAM_UPDATE_START_V2_IN_FLAG_REPORT_VERIFY_RESULT,
2080                               1);
2081 
2082         BUILD_BUG_ON(MC_CMD_NVRAM_UPDATE_START_OUT_LEN != 0);
2083 
2084         rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_UPDATE_START, inbuf, sizeof(inbuf),
2085                           NULL, 0, NULL);
2086 
2087         return rc;
2088 }
2089 
2090 static int efx_mcdi_nvram_read(struct efx_nic *efx, unsigned int type,
2091                                loff_t offset, u8 *buffer, size_t length)
2092 {
2093         MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_READ_IN_V2_LEN);
2094         MCDI_DECLARE_BUF(outbuf,
2095                          MC_CMD_NVRAM_READ_OUT_LEN(EFX_MCDI_NVRAM_LEN_MAX));
2096         size_t outlen;
2097         int rc;
2098 
2099         MCDI_SET_DWORD(inbuf, NVRAM_READ_IN_TYPE, type);
2100         MCDI_SET_DWORD(inbuf, NVRAM_READ_IN_OFFSET, offset);
2101         MCDI_SET_DWORD(inbuf, NVRAM_READ_IN_LENGTH, length);
2102         MCDI_SET_DWORD(inbuf, NVRAM_READ_IN_V2_MODE,
2103                        MC_CMD_NVRAM_READ_IN_V2_DEFAULT);
2104 
2105         rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_READ, inbuf, sizeof(inbuf),
2106                           outbuf, sizeof(outbuf), &outlen);
2107         if (rc)
2108                 return rc;
2109 
2110         memcpy(buffer, MCDI_PTR(outbuf, NVRAM_READ_OUT_READ_BUFFER), length);
2111         return 0;
2112 }
2113 
2114 static int efx_mcdi_nvram_write(struct efx_nic *efx, unsigned int type,
2115                                 loff_t offset, const u8 *buffer, size_t length)
2116 {
2117         MCDI_DECLARE_BUF(inbuf,
2118                          MC_CMD_NVRAM_WRITE_IN_LEN(EFX_MCDI_NVRAM_LEN_MAX));
2119         int rc;
2120 
2121         MCDI_SET_DWORD(inbuf, NVRAM_WRITE_IN_TYPE, type);
2122         MCDI_SET_DWORD(inbuf, NVRAM_WRITE_IN_OFFSET, offset);
2123         MCDI_SET_DWORD(inbuf, NVRAM_WRITE_IN_LENGTH, length);
2124         memcpy(MCDI_PTR(inbuf, NVRAM_WRITE_IN_WRITE_BUFFER), buffer, length);
2125 
2126         BUILD_BUG_ON(MC_CMD_NVRAM_WRITE_OUT_LEN != 0);
2127 
2128         rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_WRITE, inbuf,
2129                           ALIGN(MC_CMD_NVRAM_WRITE_IN_LEN(length), 4),
2130                           NULL, 0, NULL);
2131         return rc;
2132 }
2133 
2134 static int efx_mcdi_nvram_erase(struct efx_nic *efx, unsigned int type,
2135                                 loff_t offset, size_t length)
2136 {
2137         MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_ERASE_IN_LEN);
2138         int rc;
2139 
2140         MCDI_SET_DWORD(inbuf, NVRAM_ERASE_IN_TYPE, type);
2141         MCDI_SET_DWORD(inbuf, NVRAM_ERASE_IN_OFFSET, offset);
2142         MCDI_SET_DWORD(inbuf, NVRAM_ERASE_IN_LENGTH, length);
2143 
2144         BUILD_BUG_ON(MC_CMD_NVRAM_ERASE_OUT_LEN != 0);
2145 
2146         rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_ERASE, inbuf, sizeof(inbuf),
2147                           NULL, 0, NULL);
2148         return rc;
2149 }
2150 
2151 static int efx_mcdi_nvram_update_finish(struct efx_nic *efx, unsigned int type)
2152 {
2153         MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_UPDATE_FINISH_V2_IN_LEN);
2154         MCDI_DECLARE_BUF(outbuf, MC_CMD_NVRAM_UPDATE_FINISH_V2_OUT_LEN);
2155         size_t outlen;
2156         int rc, rc2;
2157 
2158         MCDI_SET_DWORD(inbuf, NVRAM_UPDATE_FINISH_IN_TYPE, type);
2159         /* Always set this flag. Old firmware ignores it */
2160         MCDI_POPULATE_DWORD_1(inbuf, NVRAM_UPDATE_FINISH_V2_IN_FLAGS,
2161                               NVRAM_UPDATE_FINISH_V2_IN_FLAG_REPORT_VERIFY_RESULT,
2162                               1);
2163 
2164         rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_UPDATE_FINISH, inbuf, sizeof(inbuf),
2165                           outbuf, sizeof(outbuf), &outlen);
2166         if (!rc && outlen >= MC_CMD_NVRAM_UPDATE_FINISH_V2_OUT_LEN) {
2167                 rc2 = MCDI_DWORD(outbuf, NVRAM_UPDATE_FINISH_V2_OUT_RESULT_CODE);
2168                 if (rc2 != MC_CMD_NVRAM_VERIFY_RC_SUCCESS)
2169                         netif_err(efx, drv, efx->net_dev,
2170                                   "NVRAM update failed verification with code 0x%x\n",
2171                                   rc2);
2172                 switch (rc2) {
2173                 case MC_CMD_NVRAM_VERIFY_RC_SUCCESS:
2174                         break;
2175                 case MC_CMD_NVRAM_VERIFY_RC_CMS_CHECK_FAILED:
2176                 case MC_CMD_NVRAM_VERIFY_RC_MESSAGE_DIGEST_CHECK_FAILED:
2177                 case MC_CMD_NVRAM_VERIFY_RC_SIGNATURE_CHECK_FAILED:
2178                 case MC_CMD_NVRAM_VERIFY_RC_TRUSTED_APPROVERS_CHECK_FAILED:
2179                 case MC_CMD_NVRAM_VERIFY_RC_SIGNATURE_CHAIN_CHECK_FAILED:
2180                         rc = -EIO;
2181                         break;
2182                 case MC_CMD_NVRAM_VERIFY_RC_INVALID_CMS_FORMAT:
2183                 case MC_CMD_NVRAM_VERIFY_RC_BAD_MESSAGE_DIGEST:
2184                         rc = -EINVAL;
2185                         break;
2186                 case MC_CMD_NVRAM_VERIFY_RC_NO_VALID_SIGNATURES:
2187                 case MC_CMD_NVRAM_VERIFY_RC_NO_TRUSTED_APPROVERS:
2188                 case MC_CMD_NVRAM_VERIFY_RC_NO_SIGNATURE_MATCH:
2189                         rc = -EPERM;
2190                         break;
2191                 default:
2192                         netif_err(efx, drv, efx->net_dev,
2193                                   "Unknown response to NVRAM_UPDATE_FINISH\n");
2194                         rc = -EIO;
2195                 }
2196         }
2197 
2198         return rc;
2199 }
2200 
2201 int efx_mcdi_mtd_read(struct mtd_info *mtd, loff_t start,
2202                       size_t len, size_t *retlen, u8 *buffer)
2203 {
2204         struct efx_mcdi_mtd_partition *part = to_efx_mcdi_mtd_partition(mtd);
2205         struct efx_nic *efx = mtd->priv;
2206         loff_t offset = start;
2207         loff_t end = min_t(loff_t, start + len, mtd->size);
2208         size_t chunk;
2209         int rc = 0;
2210 
2211         while (offset < end) {
2212                 chunk = min_t(size_t, end - offset, EFX_MCDI_NVRAM_LEN_MAX);
2213                 rc = efx_mcdi_nvram_read(efx, part->nvram_type, offset,
2214                                          buffer, chunk);
2215                 if (rc)
2216                         goto out;
2217                 offset += chunk;
2218                 buffer += chunk;
2219         }
2220 out:
2221         *retlen = offset - start;
2222         return rc;
2223 }
2224 
2225 int efx_mcdi_mtd_erase(struct mtd_info *mtd, loff_t start, size_t len)
2226 {
2227         struct efx_mcdi_mtd_partition *part = to_efx_mcdi_mtd_partition(mtd);
2228         struct efx_nic *efx = mtd->priv;
2229         loff_t offset = start & ~((loff_t)(mtd->erasesize - 1));
2230         loff_t end = min_t(loff_t, start + len, mtd->size);
2231         size_t chunk = part->common.mtd.erasesize;
2232         int rc = 0;
2233 
2234         if (!part->updating) {
2235                 rc = efx_mcdi_nvram_update_start(efx, part->nvram_type);
2236                 if (rc)
2237                         goto out;
2238                 part->updating = true;
2239         }
2240 
2241         /* The MCDI interface can in fact do multiple erase blocks at once;
2242          * but erasing may be slow, so we make multiple calls here to avoid
2243          * tripping the MCDI RPC timeout. */
2244         while (offset < end) {
2245                 rc = efx_mcdi_nvram_erase(efx, part->nvram_type, offset,
2246                                           chunk);
2247                 if (rc)
2248                         goto out;
2249                 offset += chunk;
2250         }
2251 out:
2252         return rc;
2253 }
2254 
2255 int efx_mcdi_mtd_write(struct mtd_info *mtd, loff_t start,
2256                        size_t len, size_t *retlen, const u8 *buffer)
2257 {
2258         struct efx_mcdi_mtd_partition *part = to_efx_mcdi_mtd_partition(mtd);
2259         struct efx_nic *efx = mtd->priv;
2260         loff_t offset = start;
2261         loff_t end = min_t(loff_t, start + len, mtd->size);
2262         size_t chunk;
2263         int rc = 0;
2264 
2265         if (!part->updating) {
2266                 rc = efx_mcdi_nvram_update_start(efx, part->nvram_type);
2267                 if (rc)
2268                         goto out;
2269                 part->updating = true;
2270         }
2271 
2272         while (offset < end) {
2273                 chunk = min_t(size_t, end - offset, EFX_MCDI_NVRAM_LEN_MAX);
2274                 rc = efx_mcdi_nvram_write(efx, part->nvram_type, offset,
2275                                           buffer, chunk);
2276                 if (rc)
2277                         goto out;
2278                 offset += chunk;
2279                 buffer += chunk;
2280         }
2281 out:
2282         *retlen = offset - start;
2283         return rc;
2284 }
2285 
2286 int efx_mcdi_mtd_sync(struct mtd_info *mtd)
2287 {
2288         struct efx_mcdi_mtd_partition *part = to_efx_mcdi_mtd_partition(mtd);
2289         struct efx_nic *efx = mtd->priv;
2290         int rc = 0;
2291 
2292         if (part->updating) {
2293                 part->updating = false;
2294                 rc = efx_mcdi_nvram_update_finish(efx, part->nvram_type);
2295         }
2296 
2297         return rc;
2298 }
2299 
2300 void efx_mcdi_mtd_rename(struct efx_mtd_partition *part)
2301 {
2302         struct efx_mcdi_mtd_partition *mcdi_part =
2303                 container_of(part, struct efx_mcdi_mtd_partition, common);
2304         struct efx_nic *efx = part->mtd.priv;
2305 
2306         snprintf(part->name, sizeof(part->name), "%s %s:%02x",
2307                  efx->name, part->type_name, mcdi_part->fw_subtype);
2308 }
2309 
2310 #endif /* CONFIG_SFC_MTD */
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/net/ethernet/sfc/mcdi.c

DEFINITIONS
