drivers/net/sfc/sfc_intr.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  *
   3  * Copyright (c) 2016-2018 Solarflare Communications Inc.
   4  * All rights reserved.
   5  *
   6  * This software was jointly developed between OKTET Labs (under contract
   7  * for Solarflare) and Solarflare Communications, Inc.
   8  */
   9
  10 /*
  11  * At the momemt of writing DPDK v16.07 has notion of two types of
  12  * interrupts: LSC (link status change) and RXQ (receive indication).
  13  * It allows to register interrupt callback for entire device which is
  14  * not intended to be used for receive indication (i.e. link status
  15  * change indication only). The handler has no information which HW
  16  * interrupt has triggered it, so we don't know which event queue should
  17  * be polled/reprimed (except qmask in the case of legacy line interrupt).
  18  */
  19
  20 #include <rte_common.h>
  21 #include <rte_interrupts.h>
  22
  23 #include "efx.h"
  24
  25 #include "sfc.h"
  26 #include "sfc_log.h"
  27 #include "sfc_ev.h"
  28
  29 static void
  30 sfc_intr_handle_mgmt_evq(struct sfc_adapter *sa)
  31 {
  32         struct sfc_evq *evq;
  33
  34         rte_spinlock_lock(&sa->mgmt_evq_lock);
  35
  36         evq = sa->mgmt_evq;
  37
  38         if (!sa->mgmt_evq_running) {
  39                 sfc_log_init(sa, "interrupt on not running management EVQ %u",
  40                              evq->evq_index);
  41         } else {
  42                 sfc_ev_qpoll(evq);
  43
  44                 if (sfc_ev_qprime(evq) != 0)
  45                         sfc_err(sa, "cannot prime EVQ %u", evq->evq_index);
  46         }
  47
  48         rte_spinlock_unlock(&sa->mgmt_evq_lock);
  49 }
  50
  51 static void
  52 sfc_intr_line_handler(void *cb_arg)
  53 {
  54         struct sfc_adapter *sa = (struct sfc_adapter *)cb_arg;
  55         efx_nic_t *enp = sa->nic;
  56         boolean_t fatal;
  57         uint32_t qmask;
  58         unsigned int lsc_seq = sa->port.lsc_seq;
  59         struct rte_pci_device *pci_dev = RTE_ETH_DEV_TO_PCI(sa->eth_dev);
  60
  61         sfc_log_init(sa, "entry");
  62
  63         if (sa->state != SFC_ADAPTER_STARTED &&
  64             sa->state != SFC_ADAPTER_STARTING &&
  65             sa->state != SFC_ADAPTER_STOPPING) {
  66                 sfc_log_init(sa,
  67                              "interrupt on stopped adapter, don't reenable");
  68                 goto exit;
  69         }
  70
  71         efx_intr_status_line(enp, &fatal, &qmask);
  72         if (fatal) {
  73                 (void)efx_intr_disable(enp);
  74                 (void)efx_intr_fatal(enp);
  75                 sfc_err(sa, "fatal, interrupts disabled");
  76                 goto exit;
  77         }
  78
  79         if (qmask & (1 << sa->mgmt_evq_index))
  80                 sfc_intr_handle_mgmt_evq(sa);
  81
  82         if (rte_intr_enable(&pci_dev->intr_handle) != 0)
  83                 sfc_err(sa, "cannot reenable interrupts");
  84
  85         sfc_log_init(sa, "done");
  86
  87 exit:
  88         if (lsc_seq != sa->port.lsc_seq) {
  89                 sfc_notice(sa, "link status change event: link %s",
  90                          sa->eth_dev->data->dev_link.link_status ?
  91                          "UP" : "DOWN");
  92                 _rte_eth_dev_callback_process(sa->eth_dev,
  93                                               RTE_ETH_EVENT_INTR_LSC,
  94                                               NULL);
  95         }
  96 }
  97
  98 static void
  99 sfc_intr_message_handler(void *cb_arg)
 100 {
 101         struct sfc_adapter *sa = (struct sfc_adapter *)cb_arg;
 102         efx_nic_t *enp = sa->nic;
 103         boolean_t fatal;
 104         unsigned int lsc_seq = sa->port.lsc_seq;
 105         struct rte_pci_device *pci_dev = RTE_ETH_DEV_TO_PCI(sa->eth_dev);
 106
 107         sfc_log_init(sa, "entry");
 108
 109         if (sa->state != SFC_ADAPTER_STARTED &&
 110             sa->state != SFC_ADAPTER_STARTING &&
 111             sa->state != SFC_ADAPTER_STOPPING) {
 112                 sfc_log_init(sa, "adapter not-started, don't reenable");
 113                 goto exit;
 114         }
 115
 116         efx_intr_status_message(enp, sa->mgmt_evq_index, &fatal);
 117         if (fatal) {
 118                 (void)efx_intr_disable(enp);
 119                 (void)efx_intr_fatal(enp);
 120                 sfc_err(sa, "fatal, interrupts disabled");
 121                 goto exit;
 122         }
 123
 124         sfc_intr_handle_mgmt_evq(sa);
 125
 126         if (rte_intr_enable(&pci_dev->intr_handle) != 0)
 127                 sfc_err(sa, "cannot reenable interrupts");
 128
 129         sfc_log_init(sa, "done");
 130
 131 exit:
 132         if (lsc_seq != sa->port.lsc_seq) {
 133                 sfc_notice(sa, "link status change event");
 134                 _rte_eth_dev_callback_process(sa->eth_dev,
 135                                               RTE_ETH_EVENT_INTR_LSC,
 136                                               NULL);
 137         }
 138 }
 139
 140 int
 141 sfc_intr_start(struct sfc_adapter *sa)
 142 {
 143         struct sfc_intr *intr = &sa->intr;
 144         struct rte_intr_handle *intr_handle;
 145         struct rte_pci_device *pci_dev;
 146         int rc;
 147
 148         sfc_log_init(sa, "entry");
 149
 150         /*
 151          * The EFX common code event queue module depends on the interrupt
 152          * module. Ensure that the interrupt module is always initialized
 153          * (even if interrupts are not used).  Status memory is required
 154          * for Siena only and may be NULL for EF10.
 155          */
 156         sfc_log_init(sa, "efx_intr_init");
 157         rc = efx_intr_init(sa->nic, intr->type, NULL);
 158         if (rc != 0)
 159                 goto fail_intr_init;
 160
 161         pci_dev = RTE_ETH_DEV_TO_PCI(sa->eth_dev);
 162         intr_handle = &pci_dev->intr_handle;
 163
 164         if (intr->handler != NULL) {
 165                 sfc_log_init(sa, "rte_intr_callback_register");
 166                 rc = rte_intr_callback_register(intr_handle, intr->handler,
 167                                                 (void *)sa);
 168                 if (rc != 0) {
 169                         sfc_err(sa,
 170                                 "cannot register interrupt handler (rc=%d)",
 171                                 rc);
 172                         /*
 173                          * Convert error code from negative returned by RTE API
 174                          * to positive used in the driver.
 175                          */
 176                         rc = -rc;
 177                         goto fail_rte_intr_cb_reg;
 178                 }
 179
 180                 sfc_log_init(sa, "rte_intr_enable");
 181                 rc = rte_intr_enable(intr_handle);
 182                 if (rc != 0) {
 183                         sfc_err(sa, "cannot enable interrupts (rc=%d)", rc);
 184                         /*
 185                          * Convert error code from negative returned by RTE API
 186                          * to positive used in the driver.
 187                          */
 188                         rc = -rc;
 189                         goto fail_rte_intr_enable;
 190                 }
 191
 192                 sfc_log_init(sa, "efx_intr_enable");
 193                 efx_intr_enable(sa->nic);
 194         }
 195
 196         sfc_log_init(sa, "done type=%u max_intr=%d nb_efd=%u vec=%p",
 197                      intr_handle->type, intr_handle->max_intr,
 198                      intr_handle->nb_efd, intr_handle->intr_vec);
 199         return 0;
 200
 201 fail_rte_intr_enable:
 202         rte_intr_callback_unregister(intr_handle, intr->handler, (void *)sa);
 203
 204 fail_rte_intr_cb_reg:
 205         efx_intr_fini(sa->nic);
 206
 207 fail_intr_init:
 208         sfc_log_init(sa, "failed %d", rc);
 209         return rc;
 210 }
 211
 212 void
 213 sfc_intr_stop(struct sfc_adapter *sa)
 214 {
 215         struct sfc_intr *intr = &sa->intr;
 216         struct rte_pci_device *pci_dev = RTE_ETH_DEV_TO_PCI(sa->eth_dev);
 217
 218         sfc_log_init(sa, "entry");
 219
 220         if (intr->handler != NULL) {
 221                 struct rte_intr_handle *intr_handle;
 222                 int rc;
 223
 224                 efx_intr_disable(sa->nic);
 225
 226                 intr_handle = &pci_dev->intr_handle;
 227                 if (rte_intr_disable(intr_handle) != 0)
 228                         sfc_err(sa, "cannot disable interrupts");
 229
 230                 while ((rc = rte_intr_callback_unregister(intr_handle,
 231                                 intr->handler, (void *)sa)) == -EAGAIN)
 232                         ;
 233                 if (rc != 1)
 234                         sfc_err(sa,
 235                                 "cannot unregister interrupt handler %d",
 236                                 rc);
 237         }
 238
 239         efx_intr_fini(sa->nic);
 240
 241         sfc_log_init(sa, "done");
 242 }
 243
 244 int
 245 sfc_intr_configure(struct sfc_adapter *sa)
 246 {
 247         struct sfc_intr *intr = &sa->intr;
 248
 249         sfc_log_init(sa, "entry");
 250
 251         intr->handler = NULL;
 252         intr->lsc_intr = (sa->eth_dev->data->dev_conf.intr_conf.lsc != 0);
 253         if (!intr->lsc_intr) {
 254                 sfc_notice(sa, "LSC tracking using interrupts is disabled");
 255                 goto done;
 256         }
 257
 258         switch (intr->type) {
 259         case EFX_INTR_MESSAGE:
 260                 intr->handler = sfc_intr_message_handler;
 261                 break;
 262         case EFX_INTR_LINE:
 263                 intr->handler = sfc_intr_line_handler;
 264                 break;
 265         case EFX_INTR_INVALID:
 266                 sfc_warn(sa, "interrupts are not supported");
 267                 break;
 268         default:
 269                 sfc_panic(sa, "unexpected EFX interrupt type %u\n", intr->type);
 270                 break;
 271         }
 272
 273 done:
 274         sfc_log_init(sa, "done");
 275         return 0;
 276 }
 277
 278 void
 279 sfc_intr_close(struct sfc_adapter *sa)
 280 {
 281         sfc_log_init(sa, "entry");
 282
 283         sfc_log_init(sa, "done");
 284 }
 285
 286 int
 287 sfc_intr_attach(struct sfc_adapter *sa)
 288 {
 289         struct sfc_intr *intr = &sa->intr;
 290         struct rte_pci_device *pci_dev = RTE_ETH_DEV_TO_PCI(sa->eth_dev);
 291
 292         sfc_log_init(sa, "entry");
 293
 294         switch (pci_dev->intr_handle.type) {
 295 #ifdef RTE_EXEC_ENV_LINUXAPP
 296         case RTE_INTR_HANDLE_UIO_INTX:
 297         case RTE_INTR_HANDLE_VFIO_LEGACY:
 298                 intr->type = EFX_INTR_LINE;
 299                 break;
 300         case RTE_INTR_HANDLE_UIO:
 301         case RTE_INTR_HANDLE_VFIO_MSI:
 302         case RTE_INTR_HANDLE_VFIO_MSIX:
 303                 intr->type = EFX_INTR_MESSAGE;
 304                 break;
 305 #endif
 306         default:
 307                 intr->type = EFX_INTR_INVALID;
 308                 break;
 309         }
 310
 311         sfc_log_init(sa, "done");
 312         return 0;
 313 }
 314
 315 void
 316 sfc_intr_detach(struct sfc_adapter *sa)
 317 {
 318         sfc_log_init(sa, "entry");
 319
 320         sa->intr.type = EFX_INTR_INVALID;
 321
 322         sfc_log_init(sa, "done");
 323 }