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         while (1) {
  34                 if (!cpr || !cpr->cp_ring_struct || !cpr->cp_db.doorbell)
  35                         return;
  36
  37                 cons = RING_CMP(cpr->cp_ring_struct, raw_cons);
  38                 cmp = &cpr->cp_desc_ring[cons];
  39
  40                 if (!CMP_VALID(cmp, raw_cons, cpr->cp_ring_struct))
  41                         break;
  42
  43                 bnxt_event_hwrm_resp_handler(bp, cmp);
  44                 raw_cons = NEXT_RAW_CMP(raw_cons);
  45         }
  46
  47         cpr->cp_raw_cons = raw_cons;
  48         if (BNXT_HAS_NQ(bp))
  49                 bnxt_db_nq_arm(cpr);
  50         else
  51                 B_CP_DB_REARM(cpr, cpr->cp_raw_cons);
  52 }
  53
  54 int bnxt_free_int(struct bnxt *bp)
  55 {
  56         struct rte_intr_handle *intr_handle = &bp->pdev->intr_handle;
  57         struct bnxt_irq *irq = bp->irq_tbl;
  58         int rc = 0;
  59
  60         if (!irq)
  61                 return 0;
  62
  63         if (irq->requested) {
  64                 int count = 0;
  65
  66                 /*
  67                  * Callback deregistration will fail with rc -EAGAIN if the
  68                  * callback is currently active. Retry every 50 ms until
  69                  * successful or 500 ms has elapsed.
  70                  */
  71                 do {
  72                         rc = rte_intr_callback_unregister(intr_handle,
  73                                                           irq->handler,
  74                                                           bp->eth_dev);
  75                         if (rc >= 0) {
  76                                 irq->requested = 0;
  77                                 break;
  78                         }
  79                         rte_delay_ms(50);
  80                 } while (count++ < 10);
  81
  82                 if (rc < 0) {
  83                         PMD_DRV_LOG(ERR, "irq cb unregister failed rc: %d\n",
  84                                     rc);
  85                         return rc;
  86                 }
  87         }
  88
  89         rte_free(bp->irq_tbl);
  90         bp->irq_tbl = NULL;
  91
  92         return 0;
  93 }
  94
  95 void bnxt_disable_int(struct bnxt *bp)
  96 {
  97         struct bnxt_cp_ring_info *cpr = bp->async_cp_ring;
  98
  99         if (BNXT_NUM_ASYNC_CPR(bp) == 0)
 100                 return;
 101
 102         if (!cpr || !cpr->cp_db.doorbell)
 103                 return;
 104
 105         /* Only the default completion ring */
 106         if (BNXT_HAS_NQ(bp))
 107                 bnxt_db_nq(cpr);
 108         else
 109                 B_CP_DB_DISARM(cpr);
 110 }
 111
 112 void bnxt_enable_int(struct bnxt *bp)
 113 {
 114         struct bnxt_cp_ring_info *cpr = bp->async_cp_ring;
 115
 116         if (BNXT_NUM_ASYNC_CPR(bp) == 0)
 117                 return;
 118
 119         if (!cpr || !cpr->cp_db.doorbell)
 120                 return;
 121
 122         /* Only the default completion ring */
 123         if (BNXT_HAS_NQ(bp))
 124                 bnxt_db_nq_arm(cpr);
 125         else
 126                 B_CP_DB_ARM(cpr);
 127 }
 128
 129 int bnxt_setup_int(struct bnxt *bp)
 130 {
 131         uint16_t total_vecs;
 132         const int len = sizeof(bp->irq_tbl[0].name);
 133         int i;
 134
 135         /* DPDK host only supports 1 MSI-X vector */
 136         total_vecs = 1;
 137         bp->irq_tbl = rte_calloc("bnxt_irq_tbl", total_vecs,
 138                                  sizeof(struct bnxt_irq), 0);
 139         if (bp->irq_tbl) {
 140                 for (i = 0; i < total_vecs; i++) {
 141                         bp->irq_tbl[i].vector = i;
 142                         snprintf(bp->irq_tbl[i].name, len,
 143                                  "%s-%d", bp->eth_dev->device->name, i);
 144                         bp->irq_tbl[i].handler = bnxt_int_handler;
 145                 }
 146         } else {
 147                 PMD_DRV_LOG(ERR, "bnxt_irq_tbl setup failed\n");
 148                 return -ENOMEM;
 149         }
 150
 151         return 0;
 152 }
 153
 154 int bnxt_request_int(struct bnxt *bp)
 155 {
 156         struct rte_intr_handle *intr_handle = &bp->pdev->intr_handle;
 157         struct bnxt_irq *irq = bp->irq_tbl;
 158         int rc = 0;
 159
 160         if (!irq)
 161                 return 0;
 162
 163         if (!irq->requested) {
 164                 rc = rte_intr_callback_register(intr_handle,
 165                                                 irq->handler,
 166                                                 bp->eth_dev);
 167                 if (!rc)
 168                         irq->requested = 1;
 169         }
 170
 171         return rc;
 172 }