drivers/scsi/snic/snic_res.c

   1 /*
   2  * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
   3  *
   4  * This program is free software; you may redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   9  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  10  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  11  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  12  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  13  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  14  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  15  * SOFTWARE.
  16  */
  17
  18 #include <linux/errno.h>
  19 #include <linux/types.h>
  20 #include <linux/pci.h>
  21
  22 #include "wq_enet_desc.h"
  23 #include "cq_enet_desc.h"
  24 #include "vnic_resource.h"
  25 #include "vnic_dev.h"
  26 #include "vnic_wq.h"
  27 #include "vnic_cq.h"
  28 #include "vnic_intr.h"
  29 #include "vnic_stats.h"
  30 #include "snic.h"
  31
  32 int
  33 snic_get_vnic_config(struct snic *snic)
  34 {
  35         struct vnic_snic_config *c = &snic->config;
  36         int ret;
  37
  38 #define GET_CONFIG(m) \
  39         do { \
  40                 ret = svnic_dev_spec(snic->vdev, \
  41                                      offsetof(struct vnic_snic_config, m), \
  42                                      sizeof(c->m), \
  43                                      &c->m); \
  44                 if (ret) { \
  45                         SNIC_HOST_ERR(snic->shost, \
  46                                       "Error getting %s, %d\n", #m, ret); \
  47                         return ret; \
  48                 } \
  49         } while (0)
  50
  51         GET_CONFIG(wq_enet_desc_count);
  52         GET_CONFIG(maxdatafieldsize);
  53         GET_CONFIG(intr_timer);
  54         GET_CONFIG(intr_timer_type);
  55         GET_CONFIG(flags);
  56         GET_CONFIG(io_throttle_count);
  57         GET_CONFIG(port_down_timeout);
  58         GET_CONFIG(port_down_io_retries);
  59         GET_CONFIG(luns_per_tgt);
  60         GET_CONFIG(xpt_type);
  61         GET_CONFIG(hid);
  62
  63         c->wq_enet_desc_count = min_t(u32,
  64                                       VNIC_SNIC_WQ_DESCS_MAX,
  65                                       max_t(u32,
  66                                             VNIC_SNIC_WQ_DESCS_MIN,
  67                                             c->wq_enet_desc_count));
  68
  69         c->wq_enet_desc_count = ALIGN(c->wq_enet_desc_count, 16);
  70
  71         c->maxdatafieldsize = min_t(u32,
  72                                     VNIC_SNIC_MAXDATAFIELDSIZE_MAX,
  73                                     max_t(u32,
  74                                           VNIC_SNIC_MAXDATAFIELDSIZE_MIN,
  75                                           c->maxdatafieldsize));
  76
  77         c->io_throttle_count = min_t(u32,
  78                                      VNIC_SNIC_IO_THROTTLE_COUNT_MAX,
  79                                      max_t(u32,
  80                                            VNIC_SNIC_IO_THROTTLE_COUNT_MIN,
  81                                            c->io_throttle_count));
  82
  83         c->port_down_timeout = min_t(u32,
  84                                      VNIC_SNIC_PORT_DOWN_TIMEOUT_MAX,
  85                                      c->port_down_timeout);
  86
  87         c->port_down_io_retries = min_t(u32,
  88                                      VNIC_SNIC_PORT_DOWN_IO_RETRIES_MAX,
  89                                      c->port_down_io_retries);
  90
  91         c->luns_per_tgt = min_t(u32,
  92                                 VNIC_SNIC_LUNS_PER_TARGET_MAX,
  93                                 max_t(u32,
  94                                       VNIC_SNIC_LUNS_PER_TARGET_MIN,
  95                                       c->luns_per_tgt));
  96
  97         c->intr_timer = min_t(u32, VNIC_INTR_TIMER_MAX, c->intr_timer);
  98
  99         SNIC_INFO("vNIC resources wq %d\n", c->wq_enet_desc_count);
 100         SNIC_INFO("vNIC mtu %d intr timer %d\n",
 101                   c->maxdatafieldsize,
 102                   c->intr_timer);
 103
 104         SNIC_INFO("vNIC flags 0x%x luns per tgt %d\n",
 105                   c->flags,
 106                   c->luns_per_tgt);
 107
 108         SNIC_INFO("vNIC io throttle count %d\n", c->io_throttle_count);
 109         SNIC_INFO("vNIC port down timeout %d port down io retries %d\n",
 110                   c->port_down_timeout,
 111                   c->port_down_io_retries);
 112
 113         SNIC_INFO("vNIC back end type = %d\n", c->xpt_type);
 114         SNIC_INFO("vNIC hid = %d\n", c->hid);
 115
 116         return 0;
 117 }
 118
 119 void
 120 snic_get_res_counts(struct snic *snic)
 121 {
 122         snic->wq_count = svnic_dev_get_res_count(snic->vdev, RES_TYPE_WQ);
 123         SNIC_BUG_ON(snic->wq_count == 0);
 124         snic->cq_count = svnic_dev_get_res_count(snic->vdev, RES_TYPE_CQ);
 125         SNIC_BUG_ON(snic->cq_count == 0);
 126         snic->intr_count = svnic_dev_get_res_count(snic->vdev,
 127                                                   RES_TYPE_INTR_CTRL);
 128         SNIC_BUG_ON(snic->intr_count == 0);
 129 }
 130
 131 void
 132 snic_free_vnic_res(struct snic *snic)
 133 {
 134         unsigned int i;
 135
 136         for (i = 0; i < snic->wq_count; i++)
 137                 svnic_wq_free(&snic->wq[i]);
 138
 139         for (i = 0; i < snic->cq_count; i++)
 140                 svnic_cq_free(&snic->cq[i]);
 141
 142         for (i = 0; i < snic->intr_count; i++)
 143                 svnic_intr_free(&snic->intr[i]);
 144 }
 145
 146 int
 147 snic_alloc_vnic_res(struct snic *snic)
 148 {
 149         enum vnic_dev_intr_mode intr_mode;
 150         unsigned int mask_on_assertion;
 151         unsigned int intr_offset;
 152         unsigned int err_intr_enable;
 153         unsigned int err_intr_offset;
 154         unsigned int i;
 155         int ret;
 156
 157         intr_mode = svnic_dev_get_intr_mode(snic->vdev);
 158
 159         SNIC_INFO("vNIC interrupt mode: %s\n",
 160                   ((intr_mode == VNIC_DEV_INTR_MODE_INTX) ?
 161                    "Legacy PCI INTx" :
 162                    ((intr_mode == VNIC_DEV_INTR_MODE_MSI) ?
 163                     "MSI" :
 164                     ((intr_mode == VNIC_DEV_INTR_MODE_MSIX) ?
 165                      "MSI-X" : "Unknown"))));
 166
 167         /* only MSI-X is supported */
 168         SNIC_BUG_ON(intr_mode != VNIC_DEV_INTR_MODE_MSIX);
 169
 170         SNIC_INFO("wq %d cq %d intr %d\n", snic->wq_count,
 171                   snic->cq_count,
 172                   snic->intr_count);
 173
 174
 175         /* Allocate WQs used for SCSI IOs */
 176         for (i = 0; i < snic->wq_count; i++) {
 177                 ret = svnic_wq_alloc(snic->vdev,
 178                                      &snic->wq[i],
 179                                      i,
 180                                      snic->config.wq_enet_desc_count,
 181                                      sizeof(struct wq_enet_desc));
 182                 if (ret)
 183                         goto error_cleanup;
 184         }
 185
 186         /* CQ for each WQ */
 187         for (i = 0; i < snic->wq_count; i++) {
 188                 ret = svnic_cq_alloc(snic->vdev,
 189                                      &snic->cq[i],
 190                                      i,
 191                                      snic->config.wq_enet_desc_count,
 192                                      sizeof(struct cq_enet_wq_desc));
 193                 if (ret)
 194                         goto error_cleanup;
 195         }
 196
 197         SNIC_BUG_ON(snic->cq_count != 2 * snic->wq_count);
 198         /* CQ for FW TO host */
 199         for (i = snic->wq_count; i < snic->cq_count; i++) {
 200                 ret = svnic_cq_alloc(snic->vdev,
 201                                      &snic->cq[i],
 202                                      i,
 203                                      (snic->config.wq_enet_desc_count * 3),
 204                                      sizeof(struct snic_fw_req));
 205                 if (ret)
 206                         goto error_cleanup;
 207         }
 208
 209         for (i = 0; i < snic->intr_count; i++) {
 210                 ret = svnic_intr_alloc(snic->vdev, &snic->intr[i], i);
 211                 if (ret)
 212                         goto error_cleanup;
 213         }
 214
 215         /*
 216          * Init WQ Resources.
 217          * WQ[0 to n] points to CQ[0 to n-1]
 218          * firmware to host comm points to CQ[n to m+1]
 219          */
 220         err_intr_enable = 1;
 221         err_intr_offset = snic->err_intr_offset;
 222
 223         for (i = 0; i < snic->wq_count; i++) {
 224                 svnic_wq_init(&snic->wq[i],
 225                               i,
 226                               err_intr_enable,
 227                               err_intr_offset);
 228         }
 229
 230         for (i = 0; i < snic->cq_count; i++) {
 231                 intr_offset = i;
 232
 233                 svnic_cq_init(&snic->cq[i],
 234                               0 /* flow_control_enable */,
 235                               1 /* color_enable */,
 236                               0 /* cq_head */,
 237                               0 /* cq_tail */,
 238                               1 /* cq_tail_color */,
 239                               1 /* interrupt_enable */,
 240                               1 /* cq_entry_enable */,
 241                               0 /* cq_message_enable */,
 242                               intr_offset,
 243                               0 /* cq_message_addr */);
 244         }
 245
 246         /*
 247          * Init INTR resources
 248          * Assumption : snic is always in MSI-X mode
 249          */
 250         SNIC_BUG_ON(intr_mode != VNIC_DEV_INTR_MODE_MSIX);
 251         mask_on_assertion = 1;
 252
 253         for (i = 0; i < snic->intr_count; i++) {
 254                 svnic_intr_init(&snic->intr[i],
 255                                 snic->config.intr_timer,
 256                                 snic->config.intr_timer_type,
 257                                 mask_on_assertion);
 258         }
 259
 260         /* init the stats memory by making the first call here */
 261         ret = svnic_dev_stats_dump(snic->vdev, &snic->stats);
 262         if (ret) {
 263                 SNIC_HOST_ERR(snic->shost,
 264                               "svnic_dev_stats_dump failed - x%x\n",
 265                               ret);
 266                 goto error_cleanup;
 267         }
 268
 269         /* Clear LIF stats */
 270         svnic_dev_stats_clear(snic->vdev);
 271         ret = 0;
 272
 273         return ret;
 274
 275 error_cleanup:
 276         snic_free_vnic_res(snic);
 277
 278         return ret;
 279 }
 280
 281 void
 282 snic_log_q_error(struct snic *snic)
 283 {
 284         unsigned int i;
 285         u32 err_status;
 286
 287         for (i = 0; i < snic->wq_count; i++) {
 288                 err_status = ioread32(&snic->wq[i].ctrl->error_status);
 289                 if (err_status)
 290                         SNIC_HOST_ERR(snic->shost,
 291                                       "WQ[%d] error status %d\n",
 292                                       i,
 293                                       err_status);
 294         }
 295 } /* end of snic_log_q_error */