drivers/net/bnxt/bnxt_irq.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2014-2015 Broadcom Corporation.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Broadcom Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include <inttypes.h>
  35
  36 #include <rte_malloc.h>
  37
  38 #include "bnxt.h"
  39 #include "bnxt_cpr.h"
  40 #include "bnxt_irq.h"
  41 #include "bnxt_ring.h"
  42 #include "hsi_struct_def_dpdk.h"
  43
  44 /*
  45  * Interrupts
  46  */
  47
  48 static void bnxt_int_handler(void *param)
  49 {
  50         struct rte_eth_dev *eth_dev = (struct rte_eth_dev *)param;
  51         struct bnxt *bp = (struct bnxt *)eth_dev->data->dev_private;
  52         struct bnxt_cp_ring_info *cpr = bp->def_cp_ring;
  53         struct cmpl_base *cmp;
  54         uint32_t raw_cons;
  55         uint32_t cons;
  56
  57         if (cpr == NULL)
  58                 return;
  59
  60         raw_cons = cpr->cp_raw_cons;
  61         while (1) {
  62                 if (!cpr || !cpr->cp_ring_struct)
  63                         return;
  64
  65                 cons = RING_CMP(cpr->cp_ring_struct, raw_cons);
  66                 cmp = &cpr->cp_desc_ring[cons];
  67
  68                 if (!CMP_VALID(cmp, raw_cons, cpr->cp_ring_struct))
  69                         break;
  70
  71                 switch (CMP_TYPE(cmp)) {
  72                 case CMPL_BASE_TYPE_HWRM_ASYNC_EVENT:
  73                         /* Handle any async event */
  74                         bnxt_handle_async_event(bp, cmp);
  75                         break;
  76                 case CMPL_BASE_TYPE_HWRM_FWD_REQ:
  77                         /* Handle HWRM forwarded responses */
  78                         bnxt_handle_fwd_req(bp, cmp);
  79                         break;
  80                 default:
  81                         /* Ignore any other events */
  82                         if (cmp->type & rte_cpu_to_le_16(0x01)) {
  83                                 if (!CMP_VALID(cmp, raw_cons,
  84                                                cpr->cp_ring_struct))
  85                                         goto no_more;
  86                         }
  87                         PMD_DRV_LOG(INFO,
  88                                 "Ignoring %02x completion\n", CMP_TYPE(cmp));
  89                         break;
  90                 }
  91                 raw_cons = NEXT_RAW_CMP(raw_cons);
  92
  93         };
  94 no_more:
  95         cpr->cp_raw_cons = raw_cons;
  96         B_CP_DB_REARM(cpr, cpr->cp_raw_cons);
  97 }
  98
  99 void bnxt_free_int(struct bnxt *bp)
 100 {
 101         struct bnxt_irq *irq;
 102
 103         irq = bp->irq_tbl;
 104         if (irq) {
 105                 if (irq->requested) {
 106                         rte_intr_disable(&bp->pdev->intr_handle);
 107                         rte_intr_callback_unregister(&bp->pdev->intr_handle,
 108                                                      irq->handler,
 109                                                      (void *)bp->eth_dev);
 110                         irq->requested = 0;
 111                 }
 112                 rte_free((void *)bp->irq_tbl);
 113                 bp->irq_tbl = NULL;
 114         }
 115 }
 116
 117 void bnxt_disable_int(struct bnxt *bp)
 118 {
 119         struct bnxt_cp_ring_info *cpr = bp->def_cp_ring;
 120
 121         /* Only the default completion ring */
 122         if (cpr != NULL && cpr->cp_doorbell != NULL)
 123                 B_CP_DB_DISARM(cpr);
 124 }
 125
 126 void bnxt_enable_int(struct bnxt *bp)
 127 {
 128         struct bnxt_cp_ring_info *cpr = bp->def_cp_ring;
 129
 130         B_CP_DB_ARM(cpr);
 131 }
 132
 133 int bnxt_setup_int(struct bnxt *bp)
 134 {
 135         uint16_t total_vecs;
 136         const int len = sizeof(bp->irq_tbl[0].name);
 137         int i, rc = 0;
 138
 139         /* DPDK host only supports 1 MSI-X vector */
 140         total_vecs = 1;
 141         bp->irq_tbl = rte_calloc("bnxt_irq_tbl", total_vecs,
 142                                  sizeof(struct bnxt_irq), 0);
 143         if (bp->irq_tbl) {
 144                 for (i = 0; i < total_vecs; i++) {
 145                         bp->irq_tbl[i].vector = i;
 146                         snprintf(bp->irq_tbl[i].name, len,
 147                                  "%s-%d", bp->eth_dev->device->name, i);
 148                         bp->irq_tbl[i].handler = bnxt_int_handler;
 149                 }
 150         } else {
 151                 rc = -ENOMEM;
 152                 goto setup_exit;
 153         }
 154         return 0;
 155
 156 setup_exit:
 157         PMD_DRV_LOG(ERR, "bnxt_irq_tbl setup failed\n");
 158         return rc;
 159 }
 160
 161 int bnxt_request_int(struct bnxt *bp)
 162 {
 163         int rc = 0;
 164
 165         struct bnxt_irq *irq = bp->irq_tbl;
 166
 167         rte_intr_callback_register(&bp->pdev->intr_handle, irq->handler,
 168                                    (void *)bp->eth_dev);
 169         rte_intr_enable(&bp->pdev->intr_handle);
 170
 171         irq->requested = 1;
 172         return rc;
 173 }