drivers/net/bnxt/bnxt_irq.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2014-2021 Broadcom
   3  * All rights reserved.
   4  */
   5
   6 #include <inttypes.h>
   7
   8 #include <rte_cycles.h>
   9 #include <rte_malloc.h>
  10
  11 #include "bnxt.h"
  12 #include "bnxt_irq.h"
  13 #include "bnxt_ring.h"
  14 #include "hsi_struct_def_dpdk.h"
  15
  16 /*
  17  * Interrupts
  18  */
  19
  20 void bnxt_int_handler(void *param)
  21 {
  22         struct rte_eth_dev *eth_dev = (struct rte_eth_dev *)param;
  23         struct bnxt *bp = eth_dev->data->dev_private;
  24         struct bnxt_cp_ring_info *cpr;
  25         struct cmpl_base *cmp;
  26         uint32_t raw_cons;
  27         uint32_t cons;
  28
  29         if (bp == NULL)
  30                 return;
  31         cpr = bp->async_cp_ring;
  32         if (cpr == NULL)
  33                 return;
  34
  35         raw_cons = cpr->cp_raw_cons;
  36         pthread_mutex_lock(&bp->def_cp_lock);
  37         while (1) {
  38                 if (!cpr || !cpr->cp_ring_struct || !cpr->cp_db.doorbell) {
  39                         pthread_mutex_unlock(&bp->def_cp_lock);
  40                         return;
  41                 }
  42
  43                 if (is_bnxt_in_error(bp)) {
  44                         pthread_mutex_unlock(&bp->def_cp_lock);
  45                         return;
  46                 }
  47
  48                 cons = RING_CMP(cpr->cp_ring_struct, raw_cons);
  49                 cmp = &cpr->cp_desc_ring[cons];
  50
  51                 if (!CMP_VALID(cmp, raw_cons, cpr->cp_ring_struct))
  52                         break;
  53
  54                 bnxt_event_hwrm_resp_handler(bp, cmp);
  55                 raw_cons = NEXT_RAW_CMP(raw_cons);
  56         }
  57
  58         cpr->cp_raw_cons = raw_cons;
  59         if (BNXT_HAS_NQ(bp))
  60                 bnxt_db_nq_arm(cpr);
  61         else
  62                 B_CP_DB_REARM(cpr, cpr->cp_raw_cons);
  63
  64         pthread_mutex_unlock(&bp->def_cp_lock);
  65 }
  66
  67 int bnxt_free_int(struct bnxt *bp)
  68 {
  69         struct rte_intr_handle *intr_handle = &bp->pdev->intr_handle;
  70         struct bnxt_irq *irq = bp->irq_tbl;
  71         int rc = 0;
  72
  73         if (!irq)
  74                 return 0;
  75
  76         if (irq->requested) {
  77                 int count = 0;
  78
  79                 /*
  80                  * Callback deregistration will fail with rc -EAGAIN if the
  81                  * callback is currently active. Retry every 50 ms until
  82                  * successful or 500 ms has elapsed.
  83                  */
  84                 do {
  85                         rc = rte_intr_callback_unregister(intr_handle,
  86                                                           irq->handler,
  87                                                           bp->eth_dev);
  88                         if (rc >= 0) {
  89                                 irq->requested = 0;
  90                                 break;
  91                         }
  92                         rte_delay_ms(50);
  93                 } while (count++ < 10);
  94
  95                 if (rc < 0) {
  96                         PMD_DRV_LOG(ERR, "irq cb unregister failed rc: %d\n",
  97                                     rc);
  98                         return rc;
  99                 }
 100         }
 101
 102         rte_free(bp->irq_tbl);
 103         bp->irq_tbl = NULL;
 104
 105         return 0;
 106 }
 107
 108 void bnxt_disable_int(struct bnxt *bp)
 109 {
 110         struct bnxt_cp_ring_info *cpr = bp->async_cp_ring;
 111
 112         if (BNXT_NUM_ASYNC_CPR(bp) == 0)
 113                 return;
 114
 115         if (is_bnxt_in_error(bp))
 116                 return;
 117
 118         if (!cpr || !cpr->cp_db.doorbell)
 119                 return;
 120
 121         /* Only the default completion ring */
 122         if (BNXT_HAS_NQ(bp))
 123                 bnxt_db_nq(cpr);
 124         else
 125                 B_CP_DB_DISARM(cpr);
 126 }
 127
 128 void bnxt_enable_int(struct bnxt *bp)
 129 {
 130         struct bnxt_cp_ring_info *cpr = bp->async_cp_ring;
 131
 132         if (BNXT_NUM_ASYNC_CPR(bp) == 0)
 133                 return;
 134
 135         if (!cpr || !cpr->cp_db.doorbell)
 136                 return;
 137
 138         /* Only the default completion ring */
 139         if (BNXT_HAS_NQ(bp))
 140                 bnxt_db_nq_arm(cpr);
 141         else
 142                 B_CP_DB_ARM(cpr);
 143 }
 144
 145 int bnxt_setup_int(struct bnxt *bp)
 146 {
 147         uint16_t total_vecs;
 148         const int len = sizeof(bp->irq_tbl[0].name);
 149         int i;
 150
 151         /* DPDK host only supports 1 MSI-X vector */
 152         total_vecs = 1;
 153         bp->irq_tbl = rte_calloc("bnxt_irq_tbl", total_vecs,
 154                                  sizeof(struct bnxt_irq), 0);
 155         if (bp->irq_tbl) {
 156                 for (i = 0; i < total_vecs; i++) {
 157                         bp->irq_tbl[i].vector_idx = i;
 158                         snprintf(bp->irq_tbl[i].name, len,
 159                                  "%s-%d", bp->eth_dev->device->name, i);
 160                         bp->irq_tbl[i].handler = bnxt_int_handler;
 161                 }
 162         } else {
 163                 PMD_DRV_LOG(ERR, "bnxt_irq_tbl setup failed\n");
 164                 return -ENOMEM;
 165         }
 166
 167         return 0;
 168 }
 169
 170 int bnxt_request_int(struct bnxt *bp)
 171 {
 172         struct rte_intr_handle *intr_handle = &bp->pdev->intr_handle;
 173         struct bnxt_irq *irq = bp->irq_tbl;
 174         int rc = 0;
 175
 176         if (!irq)
 177                 return 0;
 178
 179         if (!irq->requested) {
 180                 rc = rte_intr_callback_register(intr_handle,
 181                                                 irq->handler,
 182                                                 bp->eth_dev);
 183                 if (!rc)
 184                         irq->requested = 1;
 185         }
 186
 187 #ifdef RTE_EXEC_ENV_FREEBSD
 188         /**
 189          * In FreeBSD OS, nic_uio does not support interrupts and
 190          * interrupt register callback will fail.
 191          */
 192         rc = 0;
 193 #endif
 194
 195         return rc;
 196 }