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                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 */
  60static int
  61snic_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 > 3 || !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
  91end:
  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 */
 107int
 108snic_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
 149error:
 150        return ret;
 151} /* end of snic_queue_exch_ver_req */
 152
 153/*
 154 * snic_io_exch_ver_cmpl_handler
 155 */
 156int
 157snic_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
 225exch_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 */
 238int
 239snic_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 */
 280