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, "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); 143 144 error: 145 return ret; 146 } /* end of snic_queue_exch_ver_req */ 147 148 /* 149 * snic_io_exch_ver_cmpl_handler 150 */ 151 void 152 snic_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); 218 219 exch_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 */ 230 int 231 snic_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