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1// SPDX-License-Identifier: GPL-2.0-only2// Copyright 2014 Cisco Systems, Inc. All rights reserved.3 4#include <linux/errno.h>5#include <linux/pci.h>6#include <linux/slab.h>7 8#include <linux/interrupt.h>9#include <linux/workqueue.h>10#include <linux/spinlock.h>11#include <linux/mempool.h>12#include <scsi/scsi_tcq.h>13#include <linux/ctype.h>14 15#include "snic_io.h"16#include "snic.h"17#include "cq_enet_desc.h"18#include "snic_fwint.h"19 20/*21 * snic_handle_link : Handles link flaps.22 */23void24snic_handle_link(struct work_struct *work)25{26 struct snic *snic = container_of(work, struct snic, link_work);27 28 if (snic->config.xpt_type == SNIC_DAS)29 return;30 31 snic->link_status = svnic_dev_link_status(snic->vdev);32 snic->link_down_cnt = svnic_dev_link_down_cnt(snic->vdev);33 SNIC_HOST_INFO(snic->shost, "Link Event: Link %s.\n",34 ((snic->link_status) ? "Up" : "Down"));35 36 SNIC_ASSERT_NOT_IMPL(1);37}38 39 40/*41 * snic_ver_enc : Encodes version str to int42 * version string is similar to netmask string43 */44static int45snic_ver_enc(const char *s)46{47 int v[4] = {0};48 int i = 0, x = 0;49 char c;50 const char *p = s;51 52 /* validate version string */53 if ((strlen(s) > 15) || (strlen(s) < 7))54 goto end;55 56 while ((c = *p++)) {57 if (c == '.') {58 i++;59 continue;60 }61 62 if (i > 3 || !isdigit(c))63 goto end;64 65 v[i] = v[i] * 10 + (c - '0');66 }67 68 /* validate sub version numbers */69 for (i = 3; i >= 0; i--)70 if (v[i] > 0xff)71 goto end;72 73 x |= (v[0] << 24) | v[1] << 16 | v[2] << 8 | v[3];74 75end:76 if (x == 0) {77 SNIC_ERR("Invalid version string [%s].\n", s);78 79 return -1;80 }81 82 return x;83} /* end of snic_ver_enc */84 85/*86 * snic_qeueue_exch_ver_req :87 *88 * Queues Exchange Version Request, to communicate host information89 * in return, it gets firmware version details90 */91int92snic_queue_exch_ver_req(struct snic *snic)93{94 struct snic_req_info *rqi = NULL;95 struct snic_host_req *req = NULL;96 u32 ver = 0;97 int ret = 0;98 99 SNIC_HOST_INFO(snic->shost, "Exch Ver Req Preparing...\n");100 101 rqi = snic_req_init(snic, 0);102 if (!rqi) {103 SNIC_HOST_ERR(snic->shost, "Init Exch Ver Req failed\n");104 ret = -ENOMEM;105 goto error;106 }107 108 req = rqi_to_req(rqi);109 110 /* Initialize snic_host_req */111 snic_io_hdr_enc(&req->hdr, SNIC_REQ_EXCH_VER, 0, SCSI_NO_TAG,112 snic->config.hid, 0, (ulong)rqi);113 ver = snic_ver_enc(SNIC_DRV_VERSION);114 req->u.exch_ver.drvr_ver = cpu_to_le32(ver);115 req->u.exch_ver.os_type = cpu_to_le32(SNIC_OS_LINUX);116 117 snic_handle_untagged_req(snic, rqi);118 119 ret = snic_queue_wq_desc(snic, req, sizeof(*req));120 if (ret) {121 snic_release_untagged_req(snic, rqi);122 SNIC_HOST_ERR(snic->shost,123 "Queuing Exch Ver Req failed, err = %d\n",124 ret);125 goto error;126 }127 128 SNIC_HOST_INFO(snic->shost, "Exch Ver Req is issued. ret = %d\n", ret);129 130error:131 return ret;132} /* end of snic_queue_exch_ver_req */133 134/*135 * snic_io_exch_ver_cmpl_handler136 */137void138snic_io_exch_ver_cmpl_handler(struct snic *snic, struct snic_fw_req *fwreq)139{140 struct snic_req_info *rqi = NULL;141 struct snic_exch_ver_rsp *exv_cmpl = &fwreq->u.exch_ver_cmpl;142 u8 typ, hdr_stat;143 u32 cmnd_id, hid, max_sgs;144 ulong ctx = 0;145 unsigned long flags;146 147 SNIC_HOST_INFO(snic->shost, "Exch Ver Compl Received.\n");148 snic_io_hdr_dec(&fwreq->hdr, &typ, &hdr_stat, &cmnd_id, &hid, &ctx);149 SNIC_BUG_ON(snic->config.hid != hid);150 rqi = (struct snic_req_info *) ctx;151 152 if (hdr_stat) {153 SNIC_HOST_ERR(snic->shost,154 "Exch Ver Completed w/ err status %d\n",155 hdr_stat);156 157 goto exch_cmpl_end;158 }159 160 spin_lock_irqsave(&snic->snic_lock, flags);161 snic->fwinfo.fw_ver = le32_to_cpu(exv_cmpl->version);162 snic->fwinfo.hid = le32_to_cpu(exv_cmpl->hid);163 snic->fwinfo.max_concur_ios = le32_to_cpu(exv_cmpl->max_concur_ios);164 snic->fwinfo.max_sgs_per_cmd = le32_to_cpu(exv_cmpl->max_sgs_per_cmd);165 snic->fwinfo.max_io_sz = le32_to_cpu(exv_cmpl->max_io_sz);166 snic->fwinfo.max_tgts = le32_to_cpu(exv_cmpl->max_tgts);167 snic->fwinfo.io_tmo = le16_to_cpu(exv_cmpl->io_timeout);168 169 SNIC_HOST_INFO(snic->shost,170 "vers %u hid %u max_concur_ios %u max_sgs_per_cmd %u max_io_sz %u max_tgts %u fw tmo %u\n",171 snic->fwinfo.fw_ver,172 snic->fwinfo.hid,173 snic->fwinfo.max_concur_ios,174 snic->fwinfo.max_sgs_per_cmd,175 snic->fwinfo.max_io_sz,176 snic->fwinfo.max_tgts,177 snic->fwinfo.io_tmo);178 179 SNIC_HOST_INFO(snic->shost,180 "HBA Capabilities = 0x%x\n",181 le32_to_cpu(exv_cmpl->hba_cap));182 183 /* Updating SGList size */184 max_sgs = snic->fwinfo.max_sgs_per_cmd;185 if (max_sgs && max_sgs < SNIC_MAX_SG_DESC_CNT) {186 snic->shost->sg_tablesize = max_sgs;187 SNIC_HOST_INFO(snic->shost, "Max SGs set to %d\n",188 snic->shost->sg_tablesize);189 } else if (max_sgs > snic->shost->sg_tablesize) {190 SNIC_HOST_INFO(snic->shost,191 "Target type %d Supports Larger Max SGList %d than driver's Max SG List %d.\n",192 snic->config.xpt_type, max_sgs,193 snic->shost->sg_tablesize);194 }195 196 if (snic->shost->can_queue > snic->fwinfo.max_concur_ios)197 snic->shost->can_queue = snic->fwinfo.max_concur_ios;198 199 snic->shost->max_sectors = snic->fwinfo.max_io_sz >> 9;200 if (snic->fwinfo.wait)201 complete(snic->fwinfo.wait);202 203 spin_unlock_irqrestore(&snic->snic_lock, flags);204 205exch_cmpl_end:206 snic_release_untagged_req(snic, rqi);207 208 SNIC_HOST_INFO(snic->shost, "Exch_cmpl Done, hdr_stat %d.\n", hdr_stat);209} /* end of snic_io_exch_ver_cmpl_handler */210 211/*212 * snic_get_conf213 *214 * Synchronous call, and Retrieves snic params.215 */216int217snic_get_conf(struct snic *snic)218{219 DECLARE_COMPLETION_ONSTACK(wait);220 unsigned long flags;221 int ret;222 int nr_retries = 3;223 224 SNIC_HOST_INFO(snic->shost, "Retrieving snic params.\n");225 spin_lock_irqsave(&snic->snic_lock, flags);226 memset(&snic->fwinfo, 0, sizeof(snic->fwinfo));227 snic->fwinfo.wait = &wait;228 spin_unlock_irqrestore(&snic->snic_lock, flags);229 230 /* Additional delay to handle HW Resource initialization. */231 msleep(50);232 233 /*234 * Exch ver req can be ignored by FW, if HW Resource initialization235 * is in progress, Hence retry.236 */237 do {238 ret = snic_queue_exch_ver_req(snic);239 if (ret)240 return ret;241 242 wait_for_completion_timeout(&wait, msecs_to_jiffies(2000));243 spin_lock_irqsave(&snic->snic_lock, flags);244 ret = (snic->fwinfo.fw_ver != 0) ? 0 : -ETIMEDOUT;245 if (ret)246 SNIC_HOST_ERR(snic->shost,247 "Failed to retrieve snic params,\n");248 249 /* Unset fwinfo.wait, on success or on last retry */250 if (ret == 0 || nr_retries == 1)251 snic->fwinfo.wait = NULL;252 253 spin_unlock_irqrestore(&snic->snic_lock, flags);254 } while (ret && --nr_retries);255 256 return ret;257} /* end of snic_get_info */258