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 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 */ 60 static int 61 snic_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 91 end: 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 */ 107 int 108 snic_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); 148 149 error: 150 return ret; 151 } /* end of snic_queue_exch_ver_req */ 152 153 /* 154 * snic_io_exch_ver_cmpl_handler 155 */ 156 int 157 snic_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); 224 225 exch_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 */ 238 int 239 snic_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