scsi/snic/snic_ctl.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 // Copyright 2014 Cisco Systems, Inc.  All rights reserved.
0003
0004 #include <linux/errno.h>
0005 #include <linux/pci.h>
0006 #include <linux/slab.h>
0007
0008 #include <linux/interrupt.h>
0009 #include <linux/workqueue.h>
0010 #include <linux/spinlock.h>
0011 #include <linux/mempool.h>
0012 #include <scsi/scsi_tcq.h>
0013 #include <linux/ctype.h>
0014
0015 #include "snic_io.h"
0016 #include "snic.h"
0017 #include "cq_enet_desc.h"
0018 #include "snic_fwint.h"
0019
0020 /*
0021  * snic_handle_link : Handles link flaps.
0022  */
0023 void
0024 snic_handle_link(struct work_struct *work)
0025 {
0026     struct snic *snic = container_of(work, struct snic, link_work);
0027
0028     if (snic->config.xpt_type == SNIC_DAS)
0029         return;
0030
0031     snic->link_status = svnic_dev_link_status(snic->vdev);
0032     snic->link_down_cnt = svnic_dev_link_down_cnt(snic->vdev);
0033     SNIC_HOST_INFO(snic->shost, "Link Event: Link %s.\n",
0034                ((snic->link_status) ? "Up" : "Down"));
0035
0036     SNIC_ASSERT_NOT_IMPL(1);
0037 }
0038
0039
0040 /*
0041  * snic_ver_enc : Encodes version str to int
0042  * version string is similar to netmask string
0043  */
0044 static int
0045 snic_ver_enc(const char *s)
0046 {
0047     int v[4] = {0};
0048     int  i = 0, x = 0;
0049     char c;
0050     const char *p = s;
0051
0052     /* validate version string */
0053     if ((strlen(s) > 15) || (strlen(s) < 7))
0054         goto end;
0055
0056     while ((c = *p++)) {
0057         if (c == '.') {
0058             i++;
0059             continue;
0060         }
0061
0062         if (i > 3 || !isdigit(c))
0063             goto end;
0064
0065         v[i] = v[i] * 10 + (c - '0');
0066     }
0067
0068     /* validate sub version numbers */
0069     for (i = 3; i >= 0; i--)
0070         if (v[i] > 0xff)
0071             goto end;
0072
0073     x |= (v[0] << 24) | v[1] << 16 | v[2] << 8 | v[3];
0074
0075 end:
0076     if (x == 0) {
0077         SNIC_ERR("Invalid version string [%s].\n", s);
0078
0079         return -1;
0080     }
0081
0082     return x;
0083 } /* end of snic_ver_enc */
0084
0085 /*
0086  * snic_qeueue_exch_ver_req :
0087  *
0088  * Queues Exchange Version Request, to communicate host information
0089  * in return, it gets firmware version details
0090  */
0091 int
0092 snic_queue_exch_ver_req(struct snic *snic)
0093 {
0094     struct snic_req_info *rqi = NULL;
0095     struct snic_host_req *req = NULL;
0096     u32 ver = 0;
0097     int ret = 0;
0098
0099     SNIC_HOST_INFO(snic->shost, "Exch Ver Req Preparing...\n");
0100
0101     rqi = snic_req_init(snic, 0);
0102     if (!rqi) {
0103         SNIC_HOST_ERR(snic->shost, "Init Exch Ver Req failed\n");
0104         ret = -ENOMEM;
0105         goto error;
0106     }
0107
0108     req = rqi_to_req(rqi);
0109
0110     /* Initialize snic_host_req */
0111     snic_io_hdr_enc(&req->hdr, SNIC_REQ_EXCH_VER, 0, SCSI_NO_TAG,
0112             snic->config.hid, 0, (ulong)rqi);
0113     ver = snic_ver_enc(SNIC_DRV_VERSION);
0114     req->u.exch_ver.drvr_ver = cpu_to_le32(ver);
0115     req->u.exch_ver.os_type = cpu_to_le32(SNIC_OS_LINUX);
0116
0117     snic_handle_untagged_req(snic, rqi);
0118
0119     ret = snic_queue_wq_desc(snic, req, sizeof(*req));
0120     if (ret) {
0121         snic_release_untagged_req(snic, rqi);
0122         SNIC_HOST_ERR(snic->shost,
0123                   "Queuing Exch Ver Req failed, err = %d\n",
0124                   ret);
0125         goto error;
0126     }
0127
0128     SNIC_HOST_INFO(snic->shost, "Exch Ver Req is issued. ret = %d\n", ret);
0129
0130 error:
0131     return ret;
0132 } /* end of snic_queue_exch_ver_req */
0133
0134 /*
0135  * snic_io_exch_ver_cmpl_handler
0136  */
0137 void
0138 snic_io_exch_ver_cmpl_handler(struct snic *snic, struct snic_fw_req *fwreq)
0139 {
0140     struct snic_req_info *rqi = NULL;
0141     struct snic_exch_ver_rsp *exv_cmpl = &fwreq->u.exch_ver_cmpl;
0142     u8 typ, hdr_stat;
0143     u32 cmnd_id, hid, max_sgs;
0144     ulong ctx = 0;
0145     unsigned long flags;
0146
0147     SNIC_HOST_INFO(snic->shost, "Exch Ver Compl Received.\n");
0148     snic_io_hdr_dec(&fwreq->hdr, &typ, &hdr_stat, &cmnd_id, &hid, &ctx);
0149     SNIC_BUG_ON(snic->config.hid != hid);
0150     rqi = (struct snic_req_info *) ctx;
0151
0152     if (hdr_stat) {
0153         SNIC_HOST_ERR(snic->shost,
0154                   "Exch Ver Completed w/ err status %d\n",
0155                   hdr_stat);
0156
0157         goto exch_cmpl_end;
0158     }
0159
0160     spin_lock_irqsave(&snic->snic_lock, flags);
0161     snic->fwinfo.fw_ver = le32_to_cpu(exv_cmpl->version);
0162     snic->fwinfo.hid = le32_to_cpu(exv_cmpl->hid);
0163     snic->fwinfo.max_concur_ios = le32_to_cpu(exv_cmpl->max_concur_ios);
0164     snic->fwinfo.max_sgs_per_cmd = le32_to_cpu(exv_cmpl->max_sgs_per_cmd);
0165     snic->fwinfo.max_io_sz = le32_to_cpu(exv_cmpl->max_io_sz);
0166     snic->fwinfo.max_tgts = le32_to_cpu(exv_cmpl->max_tgts);
0167     snic->fwinfo.io_tmo = le16_to_cpu(exv_cmpl->io_timeout);
0168
0169     SNIC_HOST_INFO(snic->shost,
0170                "vers %u hid %u max_concur_ios %u max_sgs_per_cmd %u max_io_sz %u max_tgts %u fw tmo %u\n",
0171                snic->fwinfo.fw_ver,
0172                snic->fwinfo.hid,
0173                snic->fwinfo.max_concur_ios,
0174                snic->fwinfo.max_sgs_per_cmd,
0175                snic->fwinfo.max_io_sz,
0176                snic->fwinfo.max_tgts,
0177                snic->fwinfo.io_tmo);
0178
0179     SNIC_HOST_INFO(snic->shost,
0180                "HBA Capabilities = 0x%x\n",
0181                le32_to_cpu(exv_cmpl->hba_cap));
0182
0183     /* Updating SGList size */
0184     max_sgs = snic->fwinfo.max_sgs_per_cmd;
0185     if (max_sgs && max_sgs < SNIC_MAX_SG_DESC_CNT) {
0186         snic->shost->sg_tablesize = max_sgs;
0187         SNIC_HOST_INFO(snic->shost, "Max SGs set to %d\n",
0188                    snic->shost->sg_tablesize);
0189     } else if (max_sgs > snic->shost->sg_tablesize) {
0190         SNIC_HOST_INFO(snic->shost,
0191                    "Target type %d Supports Larger Max SGList %d than driver's Max SG List %d.\n",
0192                    snic->config.xpt_type, max_sgs,
0193                    snic->shost->sg_tablesize);
0194     }
0195
0196     if (snic->shost->can_queue > snic->fwinfo.max_concur_ios)
0197         snic->shost->can_queue = snic->fwinfo.max_concur_ios;
0198
0199     snic->shost->max_sectors = snic->fwinfo.max_io_sz >> 9;
0200     if (snic->fwinfo.wait)
0201         complete(snic->fwinfo.wait);
0202
0203     spin_unlock_irqrestore(&snic->snic_lock, flags);
0204
0205 exch_cmpl_end:
0206     snic_release_untagged_req(snic, rqi);
0207
0208     SNIC_HOST_INFO(snic->shost, "Exch_cmpl Done, hdr_stat %d.\n", hdr_stat);
0209 } /* end of snic_io_exch_ver_cmpl_handler */
0210
0211 /*
0212  * snic_get_conf
0213  *
0214  * Synchronous call, and Retrieves snic params.
0215  */
0216 int
0217 snic_get_conf(struct snic *snic)
0218 {
0219     DECLARE_COMPLETION_ONSTACK(wait);
0220     unsigned long flags;
0221     int ret;
0222     int nr_retries = 3;
0223
0224     SNIC_HOST_INFO(snic->shost, "Retrieving snic params.\n");
0225     spin_lock_irqsave(&snic->snic_lock, flags);
0226     memset(&snic->fwinfo, 0, sizeof(snic->fwinfo));
0227     snic->fwinfo.wait = &wait;
0228     spin_unlock_irqrestore(&snic->snic_lock, flags);
0229
0230     /* Additional delay to handle HW Resource initialization. */
0231     msleep(50);
0232
0233     /*
0234      * Exch ver req can be ignored by FW, if HW Resource initialization
0235      * is in progress, Hence retry.
0236      */
0237     do {
0238         ret = snic_queue_exch_ver_req(snic);
0239         if (ret)
0240             return ret;
0241
0242         wait_for_completion_timeout(&wait, msecs_to_jiffies(2000));
0243         spin_lock_irqsave(&snic->snic_lock, flags);
0244         ret = (snic->fwinfo.fw_ver != 0) ? 0 : -ETIMEDOUT;
0245         if (ret)
0246             SNIC_HOST_ERR(snic->shost,
0247                       "Failed to retrieve snic params,\n");
0248
0249         /* Unset fwinfo.wait, on success or on last retry */
0250         if (ret == 0 || nr_retries == 1)
0251             snic->fwinfo.wait = NULL;
0252
0253         spin_unlock_irqrestore(&snic->snic_lock, flags);
0254     } while (ret && --nr_retries);
0255
0256     return ret;
0257 } /* end of snic_get_info */