kernel/drivers/scsi/snic/snic_ctl.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/pci.h>
  20 #include <linux/slab.h>
  21
  22 #include <linux/interrupt.h>
  23 #include <linux/workqueue.h>
  24 #include <linux/spinlock.h>
  25 #include <linux/mempool.h>
  26 #include <scsi/scsi_tcq.h>
  27 #include <linux/ctype.h>
  28
  29 #include "snic_io.h"
  30 #include "snic.h"
  31 #include "cq_enet_desc.h"
  32 #include "snic_fwint.h"
  33
  34 /*
  35  * snic_handle_link : Handles link flaps.
  36  */
  37 void
  38 snic_handle_link(struct work_struct *work)
  39 {
  40         struct snic *snic = container_of(work, struct snic, link_work);
  41
  42         if (snic->config.xpt_type != SNIC_DAS) {
  43                 SNIC_HOST_INFO(snic->shost, "Link Event Received.\n");
  44                 SNIC_ASSERT_NOT_IMPL(1);
  45
  46                 return;
  47         }
  48
  49         snic->link_status = svnic_dev_link_status(snic->vdev);
  50         snic->link_down_cnt = svnic_dev_link_down_cnt(snic->vdev);
  51         SNIC_HOST_INFO(snic->shost, "Link Event: Link %s.\n",
  52                        ((snic->link_status) ? "Up" : "Down"));
  53 }
  54
  55
  56 /*
  57  * snic_ver_enc : Encodes version str to int
  58  * version string is similar to netmask string
  59  */
  60 static int
  61 snic_ver_enc(const char *s)
  62 {
  63         int v[4] = {0};
  64         int  i = 0, x = 0;
  65         char c;
  66         const char *p = s;
  67
  68         /* validate version string */
  69         if ((strlen(s) > 15) || (strlen(s) < 7))
  70                 goto end;
  71
  72         while ((c = *p++)) {
  73                 if (c == '.') {
  74                         i++;
  75                         continue;
  76                 }
  77
  78                 if (i > 4 || !isdigit(c))
  79                         goto end;
  80
  81                 v[i] = v[i] * 10 + (c - '0');
  82         }
  83
  84         /* validate sub version numbers */
  85         for (i = 3; i >= 0; i--)
  86                 if (v[i] > 0xff)
  87                         goto end;
  88
  89         x |= (v[0] << 24) | v[1] << 16 | v[2] << 8 | v[3];
  90
  91 end:
  92         if (x == 0) {
  93                 SNIC_ERR("Invalid version string [%s].\n", s);
  94
  95                 return -1;
  96         }
  97
  98         return x;
  99 } /* end of snic_ver_enc */
 100
 101 /*
 102  * snic_qeueue_exch_ver_req :
 103  *
 104  * Queues Exchange Version Request, to communicate host information
 105  * in return, it gets firmware version details
 106  */
 107 int
 108 snic_queue_exch_ver_req(struct snic *snic)
 109 {
 110         struct snic_req_info *rqi = NULL;
 111         struct snic_host_req *req = NULL;
 112         u32 ver = 0;
 113         int ret = 0;
 114
 115         SNIC_HOST_INFO(snic->shost, "Exch Ver Req Preparing...\n");
 116
 117         rqi = snic_req_init(snic, 0);
 118         if (!rqi) {
 119                 SNIC_HOST_ERR(snic->shost,
 120                               "Queuing Exch Ver Req failed, err = %d\n",
 121                               ret);
 122
 123                 ret = -ENOMEM;
 124                 goto error;
 125         }
 126
 127         req = rqi_to_req(rqi);
 128
 129         /* Initialize snic_host_req */
 130         snic_io_hdr_enc(&req->hdr, SNIC_REQ_EXCH_VER, 0, SCSI_NO_TAG,
 131                         snic->config.hid, 0, (ulong)rqi);
 132         ver = snic_ver_enc(SNIC_DRV_VERSION);
 133         req->u.exch_ver.drvr_ver = cpu_to_le32(ver);
 134         req->u.exch_ver.os_type = cpu_to_le32(SNIC_OS_LINUX);
 135
 136         snic_handle_untagged_req(snic, rqi);
 137
 138         ret = snic_queue_wq_desc(snic, req, sizeof(*req));
 139         if (ret) {
 140                 snic_release_untagged_req(snic, rqi);
 141                 SNIC_HOST_ERR(snic->shost,
 142                               "Queuing Exch Ver Req failed, err = %d\n",
 143                               ret);
 144                 goto error;
 145         }
 146
 147         SNIC_HOST_INFO(snic->shost, "Exch Ver Req is issued. ret = %d\n", ret);
 148
 149 error:
 150         return ret;
 151 } /* end of snic_queue_exch_ver_req */
 152
 153 /*
 154  * snic_io_exch_ver_cmpl_handler
 155  */
 156 int
 157 snic_io_exch_ver_cmpl_handler(struct snic *snic, struct snic_fw_req *fwreq)
 158 {
 159         struct snic_req_info *rqi = NULL;
 160         struct snic_exch_ver_rsp *exv_cmpl = &fwreq->u.exch_ver_cmpl;
 161         u8 typ, hdr_stat;
 162         u32 cmnd_id, hid, max_sgs;
 163         ulong ctx = 0;
 164         unsigned long flags;
 165         int ret = 0;
 166
 167         SNIC_HOST_INFO(snic->shost, "Exch Ver Compl Received.\n");
 168         snic_io_hdr_dec(&fwreq->hdr, &typ, &hdr_stat, &cmnd_id, &hid, &ctx);
 169         SNIC_BUG_ON(snic->config.hid != hid);
 170         rqi = (struct snic_req_info *) ctx;
 171
 172         if (hdr_stat) {
 173                 SNIC_HOST_ERR(snic->shost,
 174                               "Exch Ver Completed w/ err status %d\n",
 175                               hdr_stat);
 176
 177                 goto exch_cmpl_end;
 178         }
 179
 180         spin_lock_irqsave(&snic->snic_lock, flags);
 181         snic->fwinfo.fw_ver = le32_to_cpu(exv_cmpl->version);
 182         snic->fwinfo.hid = le32_to_cpu(exv_cmpl->hid);
 183         snic->fwinfo.max_concur_ios = le32_to_cpu(exv_cmpl->max_concur_ios);
 184         snic->fwinfo.max_sgs_per_cmd = le32_to_cpu(exv_cmpl->max_sgs_per_cmd);
 185         snic->fwinfo.max_io_sz = le32_to_cpu(exv_cmpl->max_io_sz);
 186         snic->fwinfo.max_tgts = le32_to_cpu(exv_cmpl->max_tgts);
 187         snic->fwinfo.io_tmo = le16_to_cpu(exv_cmpl->io_timeout);
 188
 189         SNIC_HOST_INFO(snic->shost,
 190                        "vers %u hid %u max_concur_ios %u max_sgs_per_cmd %u max_io_sz %u max_tgts %u fw tmo %u\n",
 191                        snic->fwinfo.fw_ver,
 192                        snic->fwinfo.hid,
 193                        snic->fwinfo.max_concur_ios,
 194                        snic->fwinfo.max_sgs_per_cmd,
 195                        snic->fwinfo.max_io_sz,
 196                        snic->fwinfo.max_tgts,
 197                        snic->fwinfo.io_tmo);
 198
 199         SNIC_HOST_INFO(snic->shost,
 200                        "HBA Capabilities = 0x%x\n",
 201                        le32_to_cpu(exv_cmpl->hba_cap));
 202
 203         /* Updating SGList size */
 204         max_sgs = snic->fwinfo.max_sgs_per_cmd;
 205         if (max_sgs && max_sgs < SNIC_MAX_SG_DESC_CNT) {
 206                 snic->shost->sg_tablesize = max_sgs;
 207                 SNIC_HOST_INFO(snic->shost, "Max SGs set to %d\n",
 208                                snic->shost->sg_tablesize);
 209         } else if (max_sgs > snic->shost->sg_tablesize) {
 210                 SNIC_HOST_INFO(snic->shost,
 211                                "Target type %d Supports Larger Max SGList %d than driver's Max SG List %d.\n",
 212                                snic->config.xpt_type, max_sgs,
 213                                snic->shost->sg_tablesize);
 214         }
 215
 216         if (snic->shost->can_queue > snic->fwinfo.max_concur_ios)
 217                 snic->shost->can_queue = snic->fwinfo.max_concur_ios;
 218
 219         snic->shost->max_sectors = snic->fwinfo.max_io_sz >> 9;
 220         if (snic->fwinfo.wait)
 221                 complete(snic->fwinfo.wait);
 222
 223         spin_unlock_irqrestore(&snic->snic_lock, flags);
 224
 225 exch_cmpl_end:
 226         snic_release_untagged_req(snic, rqi);
 227
 228         SNIC_HOST_INFO(snic->shost, "Exch_cmpl Done, hdr_stat %d.\n", hdr_stat);
 229
 230         return ret;
 231 } /* end of snic_io_exch_ver_cmpl_handler */
 232
 233 /*
 234  * snic_get_conf
 235  *
 236  * Synchronous call, and Retrieves snic params.
 237  */
 238 int
 239 snic_get_conf(struct snic *snic)
 240 {
 241         DECLARE_COMPLETION_ONSTACK(wait);
 242         unsigned long flags;
 243         int ret;
 244         int nr_retries = 3;
 245
 246         SNIC_HOST_INFO(snic->shost, "Retrieving snic params.\n");
 247         spin_lock_irqsave(&snic->snic_lock, flags);
 248         memset(&snic->fwinfo, 0, sizeof(snic->fwinfo));
 249         snic->fwinfo.wait = &wait;
 250         spin_unlock_irqrestore(&snic->snic_lock, flags);
 251
 252         /* Additional delay to handle HW Resource initialization. */
 253         msleep(50);
 254
 255         /*
 256          * Exch ver req can be ignored by FW, if HW Resource initialization
 257          * is in progress, Hence retry.
 258          */
 259         do {
 260                 ret = snic_queue_exch_ver_req(snic);
 261                 if (ret)
 262                         return ret;
 263
 264                 wait_for_completion_timeout(&wait, msecs_to_jiffies(2000));
 265                 spin_lock_irqsave(&snic->snic_lock, flags);
 266                 ret = (snic->fwinfo.fw_ver != 0) ? 0 : -ETIMEDOUT;
 267                 if (ret)
 268                         SNIC_HOST_ERR(snic->shost,
 269                                       "Failed to retrieve snic params,\n");
 270
 271                 /* Unset fwinfo.wait, on success or on last retry */
 272                 if (ret == 0 || nr_retries == 1)
 273                         snic->fwinfo.wait = NULL;
 274
 275                 spin_unlock_irqrestore(&snic->snic_lock, flags);
 276         } while (ret && --nr_retries);
 277
 278         return ret;
 279 } /* end of snic_get_info */