drivers/scsi/snic/snic_res.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 // Copyright 2014 Cisco Systems, Inc.  All rights reserved.
   3
   4 #include <linux/errno.h>
   5 #include <linux/types.h>
   6 #include <linux/pci.h>
   7
   8 #include "wq_enet_desc.h"
   9 #include "cq_enet_desc.h"
  10 #include "vnic_resource.h"
  11 #include "vnic_dev.h"
  12 #include "vnic_wq.h"
  13 #include "vnic_cq.h"
  14 #include "vnic_intr.h"
  15 #include "vnic_stats.h"
  16 #include "snic.h"
  17
  18 int
  19 snic_get_vnic_config(struct snic *snic)
  20 {
  21         struct vnic_snic_config *c = &snic->config;
  22         int ret;
  23
  24 #define GET_CONFIG(m) \
  25         do { \
  26                 ret = svnic_dev_spec(snic->vdev, \
  27                                      offsetof(struct vnic_snic_config, m), \
  28                                      sizeof(c->m), \
  29                                      &c->m); \
  30                 if (ret) { \
  31                         SNIC_HOST_ERR(snic->shost, \
  32                                       "Error getting %s, %d\n", #m, ret); \
  33                         return ret; \
  34                 } \
  35         } while (0)
  36
  37         GET_CONFIG(wq_enet_desc_count);
  38         GET_CONFIG(maxdatafieldsize);
  39         GET_CONFIG(intr_timer);
  40         GET_CONFIG(intr_timer_type);
  41         GET_CONFIG(flags);
  42         GET_CONFIG(io_throttle_count);
  43         GET_CONFIG(port_down_timeout);
  44         GET_CONFIG(port_down_io_retries);
  45         GET_CONFIG(luns_per_tgt);
  46         GET_CONFIG(xpt_type);
  47         GET_CONFIG(hid);
  48
  49         c->wq_enet_desc_count = min_t(u32,
  50                                       VNIC_SNIC_WQ_DESCS_MAX,
  51                                       max_t(u32,
  52                                             VNIC_SNIC_WQ_DESCS_MIN,
  53                                             c->wq_enet_desc_count));
  54
  55         c->wq_enet_desc_count = ALIGN(c->wq_enet_desc_count, 16);
  56
  57         c->maxdatafieldsize = min_t(u32,
  58                                     VNIC_SNIC_MAXDATAFIELDSIZE_MAX,
  59                                     max_t(u32,
  60                                           VNIC_SNIC_MAXDATAFIELDSIZE_MIN,
  61                                           c->maxdatafieldsize));
  62
  63         c->io_throttle_count = min_t(u32,
  64                                      VNIC_SNIC_IO_THROTTLE_COUNT_MAX,
  65                                      max_t(u32,
  66                                            VNIC_SNIC_IO_THROTTLE_COUNT_MIN,
  67                                            c->io_throttle_count));
  68
  69         c->port_down_timeout = min_t(u32,
  70                                      VNIC_SNIC_PORT_DOWN_TIMEOUT_MAX,
  71                                      c->port_down_timeout);
  72
  73         c->port_down_io_retries = min_t(u32,
  74                                      VNIC_SNIC_PORT_DOWN_IO_RETRIES_MAX,
  75                                      c->port_down_io_retries);
  76
  77         c->luns_per_tgt = min_t(u32,
  78                                 VNIC_SNIC_LUNS_PER_TARGET_MAX,
  79                                 max_t(u32,
  80                                       VNIC_SNIC_LUNS_PER_TARGET_MIN,
  81                                       c->luns_per_tgt));
  82
  83         c->intr_timer = min_t(u32, VNIC_INTR_TIMER_MAX, c->intr_timer);
  84
  85         SNIC_INFO("vNIC resources wq %d\n", c->wq_enet_desc_count);
  86         SNIC_INFO("vNIC mtu %d intr timer %d\n",
  87                   c->maxdatafieldsize,
  88                   c->intr_timer);
  89
  90         SNIC_INFO("vNIC flags 0x%x luns per tgt %d\n",
  91                   c->flags,
  92                   c->luns_per_tgt);
  93
  94         SNIC_INFO("vNIC io throttle count %d\n", c->io_throttle_count);
  95         SNIC_INFO("vNIC port down timeout %d port down io retries %d\n",
  96                   c->port_down_timeout,
  97                   c->port_down_io_retries);
  98
  99         SNIC_INFO("vNIC back end type = %d\n", c->xpt_type);
 100         SNIC_INFO("vNIC hid = %d\n", c->hid);
 101
 102         return 0;
 103 }
 104
 105 void
 106 snic_get_res_counts(struct snic *snic)
 107 {
 108         snic->wq_count = svnic_dev_get_res_count(snic->vdev, RES_TYPE_WQ);
 109         SNIC_BUG_ON(snic->wq_count == 0);
 110         snic->cq_count = svnic_dev_get_res_count(snic->vdev, RES_TYPE_CQ);
 111         SNIC_BUG_ON(snic->cq_count == 0);
 112         snic->intr_count = svnic_dev_get_res_count(snic->vdev,
 113                                                   RES_TYPE_INTR_CTRL);
 114         SNIC_BUG_ON(snic->intr_count == 0);
 115 }
 116
 117 void
 118 snic_free_vnic_res(struct snic *snic)
 119 {
 120         unsigned int i;
 121
 122         for (i = 0; i < snic->wq_count; i++)
 123                 svnic_wq_free(&snic->wq[i]);
 124
 125         for (i = 0; i < snic->cq_count; i++)
 126                 svnic_cq_free(&snic->cq[i]);
 127
 128         for (i = 0; i < snic->intr_count; i++)
 129                 svnic_intr_free(&snic->intr[i]);
 130 }
 131
 132 int
 133 snic_alloc_vnic_res(struct snic *snic)
 134 {
 135         enum vnic_dev_intr_mode intr_mode;
 136         unsigned int mask_on_assertion;
 137         unsigned int intr_offset;
 138         unsigned int err_intr_enable;
 139         unsigned int err_intr_offset;
 140         unsigned int i;
 141         int ret;
 142
 143         intr_mode = svnic_dev_get_intr_mode(snic->vdev);
 144
 145         SNIC_INFO("vNIC interrupt mode: %s\n",
 146                   ((intr_mode == VNIC_DEV_INTR_MODE_INTX) ?
 147                    "Legacy PCI INTx" :
 148                    ((intr_mode == VNIC_DEV_INTR_MODE_MSI) ?
 149                     "MSI" :
 150                     ((intr_mode == VNIC_DEV_INTR_MODE_MSIX) ?
 151                      "MSI-X" : "Unknown"))));
 152
 153         /* only MSI-X is supported */
 154         SNIC_BUG_ON(intr_mode != VNIC_DEV_INTR_MODE_MSIX);
 155
 156         SNIC_INFO("wq %d cq %d intr %d\n", snic->wq_count,
 157                   snic->cq_count,
 158                   snic->intr_count);
 159
 160
 161         /* Allocate WQs used for SCSI IOs */
 162         for (i = 0; i < snic->wq_count; i++) {
 163                 ret = svnic_wq_alloc(snic->vdev,
 164                                      &snic->wq[i],
 165                                      i,
 166                                      snic->config.wq_enet_desc_count,
 167                                      sizeof(struct wq_enet_desc));
 168                 if (ret)
 169                         goto error_cleanup;
 170         }
 171
 172         /* CQ for each WQ */
 173         for (i = 0; i < snic->wq_count; i++) {
 174                 ret = svnic_cq_alloc(snic->vdev,
 175                                      &snic->cq[i],
 176                                      i,
 177                                      snic->config.wq_enet_desc_count,
 178                                      sizeof(struct cq_enet_wq_desc));
 179                 if (ret)
 180                         goto error_cleanup;
 181         }
 182
 183         SNIC_BUG_ON(snic->cq_count != 2 * snic->wq_count);
 184         /* CQ for FW TO host */
 185         for (i = snic->wq_count; i < snic->cq_count; i++) {
 186                 ret = svnic_cq_alloc(snic->vdev,
 187                                      &snic->cq[i],
 188                                      i,
 189                                      (snic->config.wq_enet_desc_count * 3),
 190                                      sizeof(struct snic_fw_req));
 191                 if (ret)
 192                         goto error_cleanup;
 193         }
 194
 195         for (i = 0; i < snic->intr_count; i++) {
 196                 ret = svnic_intr_alloc(snic->vdev, &snic->intr[i], i);
 197                 if (ret)
 198                         goto error_cleanup;
 199         }
 200
 201         /*
 202          * Init WQ Resources.
 203          * WQ[0 to n] points to CQ[0 to n-1]
 204          * firmware to host comm points to CQ[n to m+1]
 205          */
 206         err_intr_enable = 1;
 207         err_intr_offset = snic->err_intr_offset;
 208
 209         for (i = 0; i < snic->wq_count; i++) {
 210                 svnic_wq_init(&snic->wq[i],
 211                               i,
 212                               err_intr_enable,
 213                               err_intr_offset);
 214         }
 215
 216         for (i = 0; i < snic->cq_count; i++) {
 217                 intr_offset = i;
 218
 219                 svnic_cq_init(&snic->cq[i],
 220                               0 /* flow_control_enable */,
 221                               1 /* color_enable */,
 222                               0 /* cq_head */,
 223                               0 /* cq_tail */,
 224                               1 /* cq_tail_color */,
 225                               1 /* interrupt_enable */,
 226                               1 /* cq_entry_enable */,
 227                               0 /* cq_message_enable */,
 228                               intr_offset,
 229                               0 /* cq_message_addr */);
 230         }
 231
 232         /*
 233          * Init INTR resources
 234          * Assumption : snic is always in MSI-X mode
 235          */
 236         SNIC_BUG_ON(intr_mode != VNIC_DEV_INTR_MODE_MSIX);
 237         mask_on_assertion = 1;
 238
 239         for (i = 0; i < snic->intr_count; i++) {
 240                 svnic_intr_init(&snic->intr[i],
 241                                 snic->config.intr_timer,
 242                                 snic->config.intr_timer_type,
 243                                 mask_on_assertion);
 244         }
 245
 246         /* init the stats memory by making the first call here */
 247         ret = svnic_dev_stats_dump(snic->vdev, &snic->stats);
 248         if (ret) {
 249                 SNIC_HOST_ERR(snic->shost,
 250                               "svnic_dev_stats_dump failed - x%x\n",
 251                               ret);
 252                 goto error_cleanup;
 253         }
 254
 255         /* Clear LIF stats */
 256         svnic_dev_stats_clear(snic->vdev);
 257         ret = 0;
 258
 259         return ret;
 260
 261 error_cleanup:
 262         snic_free_vnic_res(snic);
 263
 264         return ret;
 265 }
 266
 267 void
 268 snic_log_q_error(struct snic *snic)
 269 {
 270         unsigned int i;
 271         u32 err_status;
 272
 273         for (i = 0; i < snic->wq_count; i++) {
 274                 err_status = ioread32(&snic->wq[i].ctrl->error_status);
 275                 if (err_status)
 276                         SNIC_HOST_ERR(snic->shost,
 277                                       "WQ[%d] error status %d\n",
 278                                       i,
 279                                       err_status);
 280         }
 281 } /* end of snic_log_q_error */