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, 118 "Queuing Exch Ver Req failed, err = %d\n", 119 ret); 120 121 ret = -ENOMEM; 122 goto error; 123 } 124 125 req = rqi_to_req(rqi); 126 127 /* Initialize snic_host_req */ 128 snic_io_hdr_enc(&req->hdr, SNIC_REQ_EXCH_VER, 0, SCSI_NO_TAG, 129 snic->config.hid, 0, (ulong)rqi); 130 ver = snic_ver_enc(SNIC_DRV_VERSION); 131 req->u.exch_ver.drvr_ver = cpu_to_le32(ver); 132 req->u.exch_ver.os_type = cpu_to_le32(SNIC_OS_LINUX); 133 134 snic_handle_untagged_req(snic, rqi); 135 136 ret = snic_queue_wq_desc(snic, req, sizeof(*req)); 137 if (ret) { 138 snic_release_untagged_req(snic, rqi); 139 SNIC_HOST_ERR(snic->shost, 140 "Queuing Exch Ver Req failed, err = %d\n", 141 ret); 142 goto error; 143 } 144 145 SNIC_HOST_INFO(snic->shost, "Exch Ver Req is issued. ret = %d\n", ret); 146 147 error: 148 return ret; 149 } /* end of snic_queue_exch_ver_req */ 150 151 /* 152 * snic_io_exch_ver_cmpl_handler 153 */ 154 void 155 snic_io_exch_ver_cmpl_handler(struct snic *snic, struct snic_fw_req *fwreq) 156 { 157 struct snic_req_info *rqi = NULL; 158 struct snic_exch_ver_rsp *exv_cmpl = &fwreq->u.exch_ver_cmpl; 159 u8 typ, hdr_stat; 160 u32 cmnd_id, hid, max_sgs; 161 ulong ctx = 0; 162 unsigned long flags; 163 164 SNIC_HOST_INFO(snic->shost, "Exch Ver Compl Received.\n"); 165 snic_io_hdr_dec(&fwreq->hdr, &typ, &hdr_stat, &cmnd_id, &hid, &ctx); 166 SNIC_BUG_ON(snic->config.hid != hid); 167 rqi = (struct snic_req_info *) ctx; 168 169 if (hdr_stat) { 170 SNIC_HOST_ERR(snic->shost, 171 "Exch Ver Completed w/ err status %d\n", 172 hdr_stat); 173 174 goto exch_cmpl_end; 175 } 176 177 spin_lock_irqsave(&snic->snic_lock, flags); 178 snic->fwinfo.fw_ver = le32_to_cpu(exv_cmpl->version); 179 snic->fwinfo.hid = le32_to_cpu(exv_cmpl->hid); 180 snic->fwinfo.max_concur_ios = le32_to_cpu(exv_cmpl->max_concur_ios); 181 snic->fwinfo.max_sgs_per_cmd = le32_to_cpu(exv_cmpl->max_sgs_per_cmd); 182 snic->fwinfo.max_io_sz = le32_to_cpu(exv_cmpl->max_io_sz); 183 snic->fwinfo.max_tgts = le32_to_cpu(exv_cmpl->max_tgts); 184 snic->fwinfo.io_tmo = le16_to_cpu(exv_cmpl->io_timeout); 185 186 SNIC_HOST_INFO(snic->shost, 187 "vers %u hid %u max_concur_ios %u max_sgs_per_cmd %u max_io_sz %u max_tgts %u fw tmo %u\n", 188 snic->fwinfo.fw_ver, 189 snic->fwinfo.hid, 190 snic->fwinfo.max_concur_ios, 191 snic->fwinfo.max_sgs_per_cmd, 192 snic->fwinfo.max_io_sz, 193 snic->fwinfo.max_tgts, 194 snic->fwinfo.io_tmo); 195 196 SNIC_HOST_INFO(snic->shost, 197 "HBA Capabilities = 0x%x\n", 198 le32_to_cpu(exv_cmpl->hba_cap)); 199 200 /* Updating SGList size */ 201 max_sgs = snic->fwinfo.max_sgs_per_cmd; 202 if (max_sgs && max_sgs < SNIC_MAX_SG_DESC_CNT) { 203 snic->shost->sg_tablesize = max_sgs; 204 SNIC_HOST_INFO(snic->shost, "Max SGs set to %d\n", 205 snic->shost->sg_tablesize); 206 } else if (max_sgs > snic->shost->sg_tablesize) { 207 SNIC_HOST_INFO(snic->shost, 208 "Target type %d Supports Larger Max SGList %d than driver's Max SG List %d.\n", 209 snic->config.xpt_type, max_sgs, 210 snic->shost->sg_tablesize); 211 } 212 213 if (snic->shost->can_queue > snic->fwinfo.max_concur_ios) 214 snic->shost->can_queue = snic->fwinfo.max_concur_ios; 215 216 snic->shost->max_sectors = snic->fwinfo.max_io_sz >> 9; 217 if (snic->fwinfo.wait) 218 complete(snic->fwinfo.wait); 219 220 spin_unlock_irqrestore(&snic->snic_lock, flags); 221 222 exch_cmpl_end: 223 snic_release_untagged_req(snic, rqi); 224 225 SNIC_HOST_INFO(snic->shost, "Exch_cmpl Done, hdr_stat %d.\n", hdr_stat); 226 } /* end of snic_io_exch_ver_cmpl_handler */ 227 228 /* 229 * snic_get_conf 230 * 231 * Synchronous call, and Retrieves snic params. 232 */ 233 int 234 snic_get_conf(struct snic *snic) 235 { 236 DECLARE_COMPLETION_ONSTACK(wait); 237 unsigned long flags; 238 int ret; 239 int nr_retries = 3; 240 241 SNIC_HOST_INFO(snic->shost, "Retrieving snic params.\n"); 242 spin_lock_irqsave(&snic->snic_lock, flags); 243 memset(&snic->fwinfo, 0, sizeof(snic->fwinfo)); 244 snic->fwinfo.wait = &wait; 245 spin_unlock_irqrestore(&snic->snic_lock, flags); 246 247 /* Additional delay to handle HW Resource initialization. */ 248 msleep(50); 249 250 /* 251 * Exch ver req can be ignored by FW, if HW Resource initialization 252 * is in progress, Hence retry. 253 */ 254 do { 255 ret = snic_queue_exch_ver_req(snic); 256 if (ret) 257 return ret; 258 259 wait_for_completion_timeout(&wait, msecs_to_jiffies(2000)); 260 spin_lock_irqsave(&snic->snic_lock, flags); 261 ret = (snic->fwinfo.fw_ver != 0) ? 0 : -ETIMEDOUT; 262 if (ret) 263 SNIC_HOST_ERR(snic->shost, 264 "Failed to retrieve snic params,\n"); 265 266 /* Unset fwinfo.wait, on success or on last retry */ 267 if (ret == 0 || nr_retries == 1) 268 snic->fwinfo.wait = NULL; 269 270 spin_unlock_irqrestore(&snic->snic_lock, flags); 271 } while (ret && --nr_retries); 272 273 return ret; 274 } /* end of snic_get_info */ 275