root/drivers/scsi/snic/snic_ctl.c

DEFINITIONS

1. snic_handle_link
2. snic_ver_enc
3. snic_queue_exch_ver_req
4. snic_io_exch_ver_cmpl_handler
5. snic_get_conf

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