drivers/net/bnxt/bnxt_irq.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2014-2018 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 = bp->async_cp_ring;
  25         struct cmpl_base *cmp;
  26         uint32_t raw_cons;
  27         uint32_t cons;
  28
  29         if (cpr == NULL)
  30                 return;
  31
  32         raw_cons = cpr->cp_raw_cons;
  33         pthread_mutex_lock(&bp->def_cp_lock);
  34         while (1) {
  35                 if (!cpr || !cpr->cp_ring_struct || !cpr->cp_db.doorbell) {
  36                         pthread_mutex_unlock(&bp->def_cp_lock);
  37                         return;
  38                 }
  39
  40                 if (is_bnxt_in_error(bp)) {
  41                         pthread_mutex_unlock(&bp->def_cp_lock);
  42                         return;
  43                 }
  44
  45                 cons = RING_CMP(cpr->cp_ring_struct, raw_cons);
  46                 cmp = &cpr->cp_desc_ring[cons];
  47
  48                 if (!CMP_VALID(cmp, raw_cons, cpr->cp_ring_struct))
  49                         break;
  50
  51                 bnxt_event_hwrm_resp_handler(bp, cmp);
  52                 raw_cons = NEXT_RAW_CMP(raw_cons);
  53         }
  54
  55         cpr->cp_raw_cons = raw_cons;
  56         if (BNXT_HAS_NQ(bp))
  57                 bnxt_db_nq_arm(cpr);
  58         else
  59                 B_CP_DB_REARM(cpr, cpr->cp_raw_cons);
  60
  61         pthread_mutex_unlock(&bp->def_cp_lock);
  62 }
  63
  64 int bnxt_free_int(struct bnxt *bp)
  65 {
  66         struct rte_intr_handle *intr_handle = &bp->pdev->intr_handle;
  67         struct bnxt_irq *irq = bp->irq_tbl;
  68         int rc = 0;
  69
  70         if (!irq)
  71                 return 0;
  72
  73         if (irq->requested) {
  74                 int count = 0;
  75
  76                 /*
  77                  * Callback deregistration will fail with rc -EAGAIN if the
  78                  * callback is currently active. Retry every 50 ms until
  79                  * successful or 500 ms has elapsed.
  80                  */
  81                 do {
  82                         rc = rte_intr_callback_unregister(intr_handle,
  83                                                           irq->handler,
  84                                                           bp->eth_dev);
  85                         if (rc >= 0) {
  86                                 irq->requested = 0;
  87                                 break;
  88                         }
  89                         rte_delay_ms(50);
  90                 } while (count++ < 10);
  91
  92                 if (rc < 0) {
  93                         PMD_DRV_LOG(ERR, "irq cb unregister failed rc: %d\n",
  94                                     rc);
  95                         return rc;
  96                 }
  97         }
  98
  99         rte_free(bp->irq_tbl);
 100         bp->irq_tbl = NULL;
 101
 102         return 0;
 103 }
 104
 105 void bnxt_disable_int(struct bnxt *bp)
 106 {
 107         struct bnxt_cp_ring_info *cpr = bp->async_cp_ring;
 108
 109         if (BNXT_NUM_ASYNC_CPR(bp) == 0)
 110                 return;
 111
 112         if (is_bnxt_in_error(bp))
 113                 return;
 114
 115         if (!cpr || !cpr->cp_db.doorbell)
 116                 return;
 117
 118         /* Only the default completion ring */
 119         if (BNXT_HAS_NQ(bp))
 120                 bnxt_db_nq(cpr);
 121         else
 122                 B_CP_DB_DISARM(cpr);
 123 }
 124
 125 void bnxt_enable_int(struct bnxt *bp)
 126 {
 127         struct bnxt_cp_ring_info *cpr = bp->async_cp_ring;
 128
 129         if (BNXT_NUM_ASYNC_CPR(bp) == 0)
 130                 return;
 131
 132         if (!cpr || !cpr->cp_db.doorbell)
 133                 return;
 134
 135         /* Only the default completion ring */
 136         if (BNXT_HAS_NQ(bp))
 137                 bnxt_db_nq_arm(cpr);
 138         else
 139                 B_CP_DB_ARM(cpr);
 140 }
 141
 142 int bnxt_setup_int(struct bnxt *bp)
 143 {
 144         uint16_t total_vecs;
 145         const int len = sizeof(bp->irq_tbl[0].name);
 146         int i;
 147
 148         /* DPDK host only supports 1 MSI-X vector */
 149         total_vecs = 1;
 150         bp->irq_tbl = rte_calloc("bnxt_irq_tbl", total_vecs,
 151                                  sizeof(struct bnxt_irq), 0);
 152         if (bp->irq_tbl) {
 153                 for (i = 0; i < total_vecs; i++) {
 154                         bp->irq_tbl[i].vector = i;
 155                         snprintf(bp->irq_tbl[i].name, len,
 156                                  "%s-%d", bp->eth_dev->device->name, i);
 157                         bp->irq_tbl[i].handler = bnxt_int_handler;
 158                 }
 159         } else {
 160                 PMD_DRV_LOG(ERR, "bnxt_irq_tbl setup failed\n");
 161                 return -ENOMEM;
 162         }
 163
 164         return 0;
 165 }
 166
 167 int bnxt_request_int(struct bnxt *bp)
 168 {
 169         struct rte_intr_handle *intr_handle = &bp->pdev->intr_handle;
 170         struct bnxt_irq *irq = bp->irq_tbl;
 171         int rc = 0;
 172
 173         if (!irq)
 174                 return 0;
 175
 176         if (!irq->requested) {
 177                 rc = rte_intr_callback_register(intr_handle,
 178                                                 irq->handler,
 179                                                 bp->eth_dev);
 180                 if (!rc)
 181                         irq->requested = 1;
 182         }
 183
 184 #ifdef RTE_EXEC_ENV_FREEBSD
 185         /**
 186          * In FreeBSD OS, nic_uio does not support interrupts and
 187          * interrupt register callback will fail.
 188          */
 189         rc = 0;
 190 #endif
 191
 192         return rc;
 193 }