1 /******************************************************************* 2 * This file is part of the Emulex Linux Device Driver for * 3 * Fibre Channel Host Bus Adapters. * 4 * Copyright (C) 2017-2023 Broadcom. All Rights Reserved. The term * 5 * “Broadcom” refers to Broadcom Inc. and/or its subsidiaries. * 6 * Copyright (C) 2004-2016 Emulex. All rights reserved. * 7 * EMULEX and SLI are trademarks of Emulex. * 8 * www.broadcom.com * 9 * Portions Copyright (C) 2004-2005 Christoph Hellwig * 10 * * 11 * This program is free software; you can redistribute it and/or * 12 * modify it under the terms of version 2 of the GNU General * 13 * Public License as published by the Free Software Foundation. * 14 * This program is distributed in the hope that it will be useful. * 15 * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND * 16 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, * 17 * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE * 18 * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD * 19 * TO BE LEGALLY INVALID. See the GNU General Public License for * 20 * more details, a copy of which can be found in the file COPYING * 21 * included with this package. * 22 *******************************************************************/ 23 24 #include <linux/interrupt.h> 25 #include <linux/dma-direction.h> 26 27 #include <scsi/scsi_transport_fc.h> 28 29 #include "lpfc_hw4.h" 30 #include "lpfc_hw.h" 31 #include "lpfc_sli.h" 32 #include "lpfc_sli4.h" 33 #include "lpfc_nl.h" 34 #include "lpfc_disc.h" 35 #include "lpfc.h" 36 #include "lpfc_crtn.h" 37 38 39 /* 40 * lpfc_get_vmid_from_hashtable - search the UUID in the hash table 41 * @vport: The virtual port for which this call is being executed. 42 * @hash: calculated hash value 43 * @buf: uuid associated with the VE 44 * Return the VMID entry associated with the UUID 45 * Make sure to acquire the appropriate lock before invoking this routine. 46 */ 47 struct lpfc_vmid *lpfc_get_vmid_from_hashtable(struct lpfc_vport *vport, 48 u32 hash, u8 *buf) 49 { 50 struct lpfc_vmid *vmp; 51 52 hash_for_each_possible(vport->hash_table, vmp, hnode, hash) { 53 if (memcmp(&vmp->host_vmid[0], buf, 16) == 0) 54 return vmp; 55 } 56 return NULL; 57 } 58 59 /* 60 * lpfc_put_vmid_in_hashtable - put the VMID in the hash table 61 * @vport: The virtual port for which this call is being executed. 62 * @hash - calculated hash value 63 * @vmp: Pointer to a VMID entry representing a VM sending I/O 64 * 65 * This routine will insert the newly acquired VMID entity in the hash table. 66 * Make sure to acquire the appropriate lock before invoking this routine. 67 */ 68 static void 69 lpfc_put_vmid_in_hashtable(struct lpfc_vport *vport, u32 hash, 70 struct lpfc_vmid *vmp) 71 { 72 hash_add(vport->hash_table, &vmp->hnode, hash); 73 } 74 75 /* 76 * lpfc_vmid_hash_fn - create a hash value of the UUID 77 * @vmid: uuid associated with the VE 78 * @len: length of the VMID string 79 * Returns the calculated hash value 80 */ 81 int lpfc_vmid_hash_fn(const char *vmid, int len) 82 { 83 int c; 84 int hash = 0; 85 86 if (len == 0) 87 return 0; 88 while (len--) { 89 c = *vmid++; 90 if (c >= 'A' && c <= 'Z') 91 c += 'a' - 'A'; 92 93 hash = (hash + (c << LPFC_VMID_HASH_SHIFT) + 94 (c >> LPFC_VMID_HASH_SHIFT)) * 19; 95 } 96 97 return hash & LPFC_VMID_HASH_MASK; 98 } 99 100 /* 101 * lpfc_vmid_update_entry - update the vmid entry in the hash table 102 * @vport: The virtual port for which this call is being executed. 103 * @iodir: io direction 104 * @vmp: Pointer to a VMID entry representing a VM sending I/O 105 * @tag: VMID tag 106 */ 107 static void lpfc_vmid_update_entry(struct lpfc_vport *vport, 108 enum dma_data_direction iodir, 109 struct lpfc_vmid *vmp, 110 union lpfc_vmid_io_tag *tag) 111 { 112 u64 *lta; 113 114 if (vport->phba->pport->vmid_flag & LPFC_VMID_TYPE_PRIO) 115 tag->cs_ctl_vmid = vmp->un.cs_ctl_vmid; 116 else if (vport->phba->cfg_vmid_app_header) 117 tag->app_id = vmp->un.app_id; 118 119 if (iodir == DMA_TO_DEVICE) 120 vmp->io_wr_cnt++; 121 else if (iodir == DMA_FROM_DEVICE) 122 vmp->io_rd_cnt++; 123 124 /* update the last access timestamp in the table */ 125 lta = per_cpu_ptr(vmp->last_io_time, raw_smp_processor_id()); 126 *lta = jiffies; 127 } 128 129 static void lpfc_vmid_assign_cs_ctl(struct lpfc_vport *vport, 130 struct lpfc_vmid *vmid) 131 { 132 u32 hash; 133 struct lpfc_vmid *pvmid; 134 135 if (vport->port_type == LPFC_PHYSICAL_PORT) { 136 vmid->un.cs_ctl_vmid = lpfc_vmid_get_cs_ctl(vport); 137 } else { 138 hash = lpfc_vmid_hash_fn(vmid->host_vmid, vmid->vmid_len); 139 pvmid = 140 lpfc_get_vmid_from_hashtable(vport->phba->pport, hash, 141 vmid->host_vmid); 142 if (pvmid) 143 vmid->un.cs_ctl_vmid = pvmid->un.cs_ctl_vmid; 144 else 145 vmid->un.cs_ctl_vmid = lpfc_vmid_get_cs_ctl(vport); 146 } 147 } 148 149 /* 150 * lpfc_vmid_get_appid - get the VMID associated with the UUID 151 * @vport: The virtual port for which this call is being executed. 152 * @uuid: UUID associated with the VE 153 * @cmd: address of scsi_cmd descriptor 154 * @iodir: io direction 155 * @tag: VMID tag 156 * Returns status of the function 157 */ 158 int lpfc_vmid_get_appid(struct lpfc_vport *vport, char *uuid, 159 enum dma_data_direction iodir, 160 union lpfc_vmid_io_tag *tag) 161 { 162 struct lpfc_vmid *vmp = NULL; 163 int hash, len, rc = -EPERM, i; 164 165 /* check if QFPA is complete */ 166 if (lpfc_vmid_is_type_priority_tag(vport) && 167 !(vport->vmid_flag & LPFC_VMID_QFPA_CMPL) && 168 (vport->vmid_flag & LPFC_VMID_ISSUE_QFPA)) { 169 vport->work_port_events |= WORKER_CHECK_VMID_ISSUE_QFPA; 170 return -EAGAIN; 171 } 172 173 /* search if the UUID has already been mapped to the VMID */ 174 len = strlen(uuid); 175 hash = lpfc_vmid_hash_fn(uuid, len); 176 177 /* search for the VMID in the table */ 178 read_lock(&vport->vmid_lock); 179 vmp = lpfc_get_vmid_from_hashtable(vport, hash, uuid); 180 181 /* if found, check if its already registered */ 182 if (vmp && vmp->flag & LPFC_VMID_REGISTERED) { 183 read_unlock(&vport->vmid_lock); 184 lpfc_vmid_update_entry(vport, iodir, vmp, tag); 185 rc = 0; 186 } else if (vmp && (vmp->flag & LPFC_VMID_REQ_REGISTER || 187 vmp->flag & LPFC_VMID_DE_REGISTER)) { 188 /* else if register or dereg request has already been sent */ 189 /* Hence VMID tag will not be added for this I/O */ 190 read_unlock(&vport->vmid_lock); 191 rc = -EBUSY; 192 } else { 193 /* The VMID was not found in the hashtable. At this point, */ 194 /* drop the read lock first before proceeding further */ 195 read_unlock(&vport->vmid_lock); 196 /* start the process to obtain one as per the */ 197 /* type of the VMID indicated */ 198 write_lock(&vport->vmid_lock); 199 vmp = lpfc_get_vmid_from_hashtable(vport, hash, uuid); 200 201 /* while the read lock was released, in case the entry was */ 202 /* added by other context or is in process of being added */ 203 if (vmp && vmp->flag & LPFC_VMID_REGISTERED) { 204 lpfc_vmid_update_entry(vport, iodir, vmp, tag); 205 write_unlock(&vport->vmid_lock); 206 return 0; 207 } else if (vmp && vmp->flag & LPFC_VMID_REQ_REGISTER) { 208 write_unlock(&vport->vmid_lock); 209 return -EBUSY; 210 } 211 212 /* else search and allocate a free slot in the hash table */ 213 if (vport->cur_vmid_cnt < vport->max_vmid) { 214 for (i = 0; i < vport->max_vmid; i++) { 215 vmp = vport->vmid + i; 216 if (vmp->flag == LPFC_VMID_SLOT_FREE) 217 break; 218 } 219 if (i == vport->max_vmid) 220 vmp = NULL; 221 } else { 222 vmp = NULL; 223 } 224 225 if (!vmp) { 226 write_unlock(&vport->vmid_lock); 227 return -ENOMEM; 228 } 229 230 /* Add the vmid and register */ 231 lpfc_put_vmid_in_hashtable(vport, hash, vmp); 232 vmp->vmid_len = len; 233 memcpy(vmp->host_vmid, uuid, vmp->vmid_len); 234 vmp->io_rd_cnt = 0; 235 vmp->io_wr_cnt = 0; 236 vmp->flag = LPFC_VMID_SLOT_USED; 237 238 vmp->delete_inactive = 239 vport->vmid_inactivity_timeout ? 1 : 0; 240 241 /* if type priority tag, get next available VMID */ 242 if (vport->phba->pport->vmid_flag & LPFC_VMID_TYPE_PRIO) 243 lpfc_vmid_assign_cs_ctl(vport, vmp); 244 245 /* allocate the per cpu variable for holding */ 246 /* the last access time stamp only if VMID is enabled */ 247 if (!vmp->last_io_time) 248 vmp->last_io_time = alloc_percpu_gfp(u64, GFP_ATOMIC); 249 if (!vmp->last_io_time) { 250 hash_del(&vmp->hnode); 251 vmp->flag = LPFC_VMID_SLOT_FREE; 252 write_unlock(&vport->vmid_lock); 253 return -EIO; 254 } 255 256 write_unlock(&vport->vmid_lock); 257 258 /* complete transaction with switch */ 259 if (vport->phba->pport->vmid_flag & LPFC_VMID_TYPE_PRIO) 260 rc = lpfc_vmid_uvem(vport, vmp, true); 261 else if (vport->phba->cfg_vmid_app_header) 262 rc = lpfc_vmid_cmd(vport, SLI_CTAS_RAPP_IDENT, vmp); 263 if (!rc) { 264 write_lock(&vport->vmid_lock); 265 vport->cur_vmid_cnt++; 266 vmp->flag |= LPFC_VMID_REQ_REGISTER; 267 write_unlock(&vport->vmid_lock); 268 } else { 269 write_lock(&vport->vmid_lock); 270 hash_del(&vmp->hnode); 271 vmp->flag = LPFC_VMID_SLOT_FREE; 272 free_percpu(vmp->last_io_time); 273 write_unlock(&vport->vmid_lock); 274 return -EIO; 275 } 276 277 /* finally, enable the idle timer once */ 278 if (!(vport->phba->pport->vmid_flag & LPFC_VMID_TIMER_ENBLD)) { 279 mod_timer(&vport->phba->inactive_vmid_poll, 280 jiffies + 281 msecs_to_jiffies(1000 * LPFC_VMID_TIMER)); 282 vport->phba->pport->vmid_flag |= LPFC_VMID_TIMER_ENBLD; 283 } 284 } 285 return rc; 286 } 287 288 /* 289 * lpfc_reinit_vmid - reinitializes the vmid data structure 290 * @vport: pointer to vport data structure 291 * 292 * This routine reinitializes the vmid post flogi completion 293 * 294 * Return codes 295 * None 296 */ 297 void 298 lpfc_reinit_vmid(struct lpfc_vport *vport) 299 { 300 u32 bucket, i, cpu; 301 struct lpfc_vmid *cur; 302 struct lpfc_vmid *vmp = NULL; 303 struct hlist_node *tmp; 304 305 write_lock(&vport->vmid_lock); 306 vport->cur_vmid_cnt = 0; 307 308 for (i = 0; i < vport->max_vmid; i++) { 309 vmp = &vport->vmid[i]; 310 vmp->flag = LPFC_VMID_SLOT_FREE; 311 memset(vmp->host_vmid, 0, sizeof(vmp->host_vmid)); 312 vmp->io_rd_cnt = 0; 313 vmp->io_wr_cnt = 0; 314 315 if (vmp->last_io_time) 316 for_each_possible_cpu(cpu) 317 *per_cpu_ptr(vmp->last_io_time, cpu) = 0; 318 } 319 320 /* for all elements in the hash table */ 321 if (!hash_empty(vport->hash_table)) 322 hash_for_each_safe(vport->hash_table, bucket, tmp, cur, hnode) 323 hash_del(&cur->hnode); 324 vport->vmid_flag = 0; 325 write_unlock(&vport->vmid_lock); 326 } 327