LXR linux/drivers/scsi/snic/snic

   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 */
  37void
  38snic_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 */
  58static int
  59snic_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
  89end:
  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 */
 105int
 106snic_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, "Init Exch Ver Req failed\n");
 118                ret = -ENOMEM;
 119                goto error;
 120        }
 121
 122        req = rqi_to_req(rqi);
 123
 124        /* Initialize snic_host_req */
 125        snic_io_hdr_enc(&req->hdr, SNIC_REQ_EXCH_VER, 0, SCSI_NO_TAG,
 126                        snic->config.hid, 0, (ulong)rqi);
 127        ver = snic_ver_enc(SNIC_DRV_VERSION);
 128        req->u.exch_ver.drvr_ver = cpu_to_le32(ver);
 129        req->u.exch_ver.os_type = cpu_to_le32(SNIC_OS_LINUX);
 130
 131        snic_handle_untagged_req(snic, rqi);
 132
 133        ret = snic_queue_wq_desc(snic, req, sizeof(*req));
 134        if (ret) {
 135                snic_release_untagged_req(snic, rqi);
 136                SNIC_HOST_ERR(snic->shost,
 137                              "Queuing Exch Ver Req failed, err = %d\n",
 138                              ret);
 139                goto error;
 140        }
 141
 142        SNIC_HOST_INFO(snic->shost, "Exch Ver Req is issued. ret = %d\n", ret);
 143
 144error:
 145        return ret;
 146} /* end of snic_queue_exch_ver_req */
 147
 148/*
 149 * snic_io_exch_ver_cmpl_handler
 150 */
 151void
 152snic_io_exch_ver_cmpl_handler(struct snic *snic, struct snic_fw_req *fwreq)
 153{
 154        struct snic_req_info *rqi = NULL;
 155        struct snic_exch_ver_rsp *exv_cmpl = &fwreq->u.exch_ver_cmpl;
 156        u8 typ, hdr_stat;
 157        u32 cmnd_id, hid, max_sgs;
 158        ulong ctx = 0;
 159        unsigned long flags;
 160
 161        SNIC_HOST_INFO(snic->shost, "Exch Ver Compl Received.\n");
 162        snic_io_hdr_dec(&fwreq->hdr, &typ, &hdr_stat, &cmnd_id, &hid, &ctx);
 163        SNIC_BUG_ON(snic->config.hid != hid);
 164        rqi = (struct snic_req_info *) ctx;
 165
 166        if (hdr_stat) {
 167                SNIC_HOST_ERR(snic->shost,
 168                              "Exch Ver Completed w/ err status %d\n",
 169                              hdr_stat);
 170
 171                goto exch_cmpl_end;
 172        }
 173
 174        spin_lock_irqsave(&snic->snic_lock, flags);
 175        snic->fwinfo.fw_ver = le32_to_cpu(exv_cmpl->version);
 176        snic->fwinfo.hid = le32_to_cpu(exv_cmpl->hid);
 177        snic->fwinfo.max_concur_ios = le32_to_cpu(exv_cmpl->max_concur_ios);
 178        snic->fwinfo.max_sgs_per_cmd = le32_to_cpu(exv_cmpl->max_sgs_per_cmd);
 179        snic->fwinfo.max_io_sz = le32_to_cpu(exv_cmpl->max_io_sz);
 180        snic->fwinfo.max_tgts = le32_to_cpu(exv_cmpl->max_tgts);
 181        snic->fwinfo.io_tmo = le16_to_cpu(exv_cmpl->io_timeout);
 182
 183        SNIC_HOST_INFO(snic->shost,
 184                       "vers %u hid %u max_concur_ios %u max_sgs_per_cmd %u max_io_sz %u max_tgts %u fw tmo %u\n",
 185                       snic->fwinfo.fw_ver,
 186                       snic->fwinfo.hid,
 187                       snic->fwinfo.max_concur_ios,
 188                       snic->fwinfo.max_sgs_per_cmd,
 189                       snic->fwinfo.max_io_sz,
 190                       snic->fwinfo.max_tgts,
 191                       snic->fwinfo.io_tmo);
 192
 193        SNIC_HOST_INFO(snic->shost,
 194                       "HBA Capabilities = 0x%x\n",
 195                       le32_to_cpu(exv_cmpl->hba_cap));
 196
 197        /* Updating SGList size */
 198        max_sgs = snic->fwinfo.max_sgs_per_cmd;
 199        if (max_sgs && max_sgs < SNIC_MAX_SG_DESC_CNT) {
 200                snic->shost->sg_tablesize = max_sgs;
 201                SNIC_HOST_INFO(snic->shost, "Max SGs set to %d\n",
 202                               snic->shost->sg_tablesize);
 203        } else if (max_sgs > snic->shost->sg_tablesize) {
 204                SNIC_HOST_INFO(snic->shost,
 205                               "Target type %d Supports Larger Max SGList %d than driver's Max SG List %d.\n",
 206                               snic->config.xpt_type, max_sgs,
 207                               snic->shost->sg_tablesize);
 208        }
 209
 210        if (snic->shost->can_queue > snic->fwinfo.max_concur_ios)
 211                snic->shost->can_queue = snic->fwinfo.max_concur_ios;
 212
 213        snic->shost->max_sectors = snic->fwinfo.max_io_sz >> 9;
 214        if (snic->fwinfo.wait)
 215                complete(snic->fwinfo.wait);
 216
 217        spin_unlock_irqrestore(&snic->snic_lock, flags);
 218
 219exch_cmpl_end:
 220        snic_release_untagged_req(snic, rqi);
 221
 222        SNIC_HOST_INFO(snic->shost, "Exch_cmpl Done, hdr_stat %d.\n", hdr_stat);
 223} /* end of snic_io_exch_ver_cmpl_handler */
 224
 225/*
 226 * snic_get_conf
 227 *
 228 * Synchronous call, and Retrieves snic params.
 229 */
 230int
 231snic_get_conf(struct snic *snic)
 232{
 233        DECLARE_COMPLETION_ONSTACK(wait);
 234        unsigned long flags;
 235        int ret;
 236        int nr_retries = 3;
 237
 238        SNIC_HOST_INFO(snic->shost, "Retrieving snic params.\n");
 239        spin_lock_irqsave(&snic->snic_lock, flags);
 240        memset(&snic->fwinfo, 0, sizeof(snic->fwinfo));
 241        snic->fwinfo.wait = &wait;
 242        spin_unlock_irqrestore(&snic->snic_lock, flags);
 243
 244        /* Additional delay to handle HW Resource initialization. */
 245        msleep(50);
 246
 247        /*
 248         * Exch ver req can be ignored by FW, if HW Resource initialization
 249         * is in progress, Hence retry.
 250         */
 251        do {
 252                ret = snic_queue_exch_ver_req(snic);
 253                if (ret)
 254                        return ret;
 255
 256                wait_for_completion_timeout(&wait, msecs_to_jiffies(2000));
 257                spin_lock_irqsave(&snic->snic_lock, flags);
 258                ret = (snic->fwinfo.fw_ver != 0) ? 0 : -ETIMEDOUT;
 259                if (ret)
 260                        SNIC_HOST_ERR(snic->shost,
 261                                      "Failed to retrieve snic params,\n");
 262
 263                /* Unset fwinfo.wait, on success or on last retry */
 264                if (ret == 0 || nr_retries == 1)
 265                        snic->fwinfo.wait = NULL;
 266
 267                spin_unlock_irqrestore(&snic->snic_lock, flags);
 268        } while (ret && --nr_retries);
 269
 270        return ret;
 271} /* end of snic_get_info */
 272