kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 1 | /* |
| 2 | * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver. |
| 3 | * |
| 4 | * Copyright (c) 2010 Chelsio Communications, Inc. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation. |
| 9 | * |
| 10 | * Written by: Karen Xie (kxie@chelsio.com) |
| 11 | * Written by: Rakesh Ranjan (rranjan@chelsio.com) |
| 12 | */ |
| 13 | |
| 14 | #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ |
| 15 | |
| 16 | #include <linux/skbuff.h> |
| 17 | #include <linux/crypto.h> |
| 18 | #include <linux/scatterlist.h> |
| 19 | #include <linux/pci.h> |
| 20 | #include <scsi/scsi.h> |
| 21 | #include <scsi/scsi_cmnd.h> |
| 22 | #include <scsi/scsi_host.h> |
| 23 | #include <linux/if_vlan.h> |
| 24 | #include <linux/inet.h> |
| 25 | #include <net/dst.h> |
| 26 | #include <net/route.h> |
| 27 | #include <linux/inetdevice.h> /* ip_dev_find */ |
| 28 | #include <net/tcp.h> |
| 29 | |
| 30 | static unsigned int dbg_level; |
| 31 | |
| 32 | #include "libcxgbi.h" |
| 33 | |
| 34 | #define DRV_MODULE_NAME "libcxgbi" |
| 35 | #define DRV_MODULE_DESC "Chelsio iSCSI driver library" |
| 36 | #define DRV_MODULE_VERSION "0.9.0" |
| 37 | #define DRV_MODULE_RELDATE "Jun. 2010" |
| 38 | |
| 39 | MODULE_AUTHOR("Chelsio Communications, Inc."); |
| 40 | MODULE_DESCRIPTION(DRV_MODULE_DESC); |
| 41 | MODULE_VERSION(DRV_MODULE_VERSION); |
| 42 | MODULE_LICENSE("GPL"); |
| 43 | |
| 44 | module_param(dbg_level, uint, 0644); |
| 45 | MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)"); |
| 46 | |
| 47 | |
| 48 | /* |
| 49 | * cxgbi device management |
| 50 | * maintains a list of the cxgbi devices |
| 51 | */ |
| 52 | static LIST_HEAD(cdev_list); |
| 53 | static DEFINE_MUTEX(cdev_mutex); |
| 54 | |
| 55 | int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base, |
| 56 | unsigned int max_conn) |
| 57 | { |
| 58 | struct cxgbi_ports_map *pmap = &cdev->pmap; |
| 59 | |
| 60 | pmap->port_csk = cxgbi_alloc_big_mem(max_conn * |
| 61 | sizeof(struct cxgbi_sock *), |
| 62 | GFP_KERNEL); |
| 63 | if (!pmap->port_csk) { |
| 64 | pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn); |
| 65 | return -ENOMEM; |
| 66 | } |
| 67 | |
| 68 | pmap->max_connect = max_conn; |
| 69 | pmap->sport_base = base; |
| 70 | spin_lock_init(&pmap->lock); |
| 71 | return 0; |
| 72 | } |
| 73 | EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create); |
| 74 | |
| 75 | void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev) |
| 76 | { |
| 77 | struct cxgbi_ports_map *pmap = &cdev->pmap; |
| 78 | struct cxgbi_sock *csk; |
| 79 | int i; |
| 80 | |
| 81 | for (i = 0; i < pmap->max_connect; i++) { |
| 82 | if (pmap->port_csk[i]) { |
| 83 | csk = pmap->port_csk[i]; |
| 84 | pmap->port_csk[i] = NULL; |
| 85 | log_debug(1 << CXGBI_DBG_SOCK, |
| 86 | "csk 0x%p, cdev 0x%p, offload down.\n", |
| 87 | csk, cdev); |
| 88 | spin_lock_bh(&csk->lock); |
| 89 | cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN); |
| 90 | cxgbi_sock_closed(csk); |
| 91 | spin_unlock_bh(&csk->lock); |
| 92 | cxgbi_sock_put(csk); |
| 93 | } |
| 94 | } |
| 95 | } |
| 96 | EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup); |
| 97 | |
| 98 | static inline void cxgbi_device_destroy(struct cxgbi_device *cdev) |
| 99 | { |
| 100 | log_debug(1 << CXGBI_DBG_DEV, |
| 101 | "cdev 0x%p, p# %u.\n", cdev, cdev->nports); |
| 102 | cxgbi_hbas_remove(cdev); |
| 103 | cxgbi_device_portmap_cleanup(cdev); |
| 104 | if (cdev->dev_ddp_cleanup) |
| 105 | cdev->dev_ddp_cleanup(cdev); |
| 106 | else |
| 107 | cxgbi_ddp_cleanup(cdev); |
| 108 | if (cdev->ddp) |
| 109 | cxgbi_ddp_cleanup(cdev); |
| 110 | if (cdev->pmap.max_connect) |
| 111 | cxgbi_free_big_mem(cdev->pmap.port_csk); |
| 112 | kfree(cdev); |
| 113 | } |
| 114 | |
| 115 | struct cxgbi_device *cxgbi_device_register(unsigned int extra, |
| 116 | unsigned int nports) |
| 117 | { |
| 118 | struct cxgbi_device *cdev; |
| 119 | |
| 120 | cdev = kzalloc(sizeof(*cdev) + extra + nports * |
| 121 | (sizeof(struct cxgbi_hba *) + |
| 122 | sizeof(struct net_device *)), |
| 123 | GFP_KERNEL); |
| 124 | if (!cdev) { |
| 125 | pr_warn("nport %d, OOM.\n", nports); |
| 126 | return NULL; |
| 127 | } |
| 128 | cdev->ports = (struct net_device **)(cdev + 1); |
| 129 | cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports * |
| 130 | sizeof(struct net_device *)); |
| 131 | if (extra) |
| 132 | cdev->dd_data = ((char *)cdev->hbas) + |
| 133 | nports * sizeof(struct cxgbi_hba *); |
| 134 | spin_lock_init(&cdev->pmap.lock); |
| 135 | |
| 136 | mutex_lock(&cdev_mutex); |
| 137 | list_add_tail(&cdev->list_head, &cdev_list); |
| 138 | mutex_unlock(&cdev_mutex); |
| 139 | |
| 140 | log_debug(1 << CXGBI_DBG_DEV, |
| 141 | "cdev 0x%p, p# %u.\n", cdev, nports); |
| 142 | return cdev; |
| 143 | } |
| 144 | EXPORT_SYMBOL_GPL(cxgbi_device_register); |
| 145 | |
| 146 | void cxgbi_device_unregister(struct cxgbi_device *cdev) |
| 147 | { |
| 148 | log_debug(1 << CXGBI_DBG_DEV, |
| 149 | "cdev 0x%p, p# %u,%s.\n", |
| 150 | cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : ""); |
| 151 | mutex_lock(&cdev_mutex); |
| 152 | list_del(&cdev->list_head); |
| 153 | mutex_unlock(&cdev_mutex); |
| 154 | cxgbi_device_destroy(cdev); |
| 155 | } |
| 156 | EXPORT_SYMBOL_GPL(cxgbi_device_unregister); |
| 157 | |
| 158 | void cxgbi_device_unregister_all(unsigned int flag) |
| 159 | { |
| 160 | struct cxgbi_device *cdev, *tmp; |
| 161 | |
| 162 | mutex_lock(&cdev_mutex); |
| 163 | list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) { |
| 164 | if ((cdev->flags & flag) == flag) { |
| 165 | log_debug(1 << CXGBI_DBG_DEV, |
| 166 | "cdev 0x%p, p# %u,%s.\n", |
| 167 | cdev, cdev->nports, cdev->nports ? |
| 168 | cdev->ports[0]->name : ""); |
| 169 | list_del(&cdev->list_head); |
| 170 | cxgbi_device_destroy(cdev); |
| 171 | } |
| 172 | } |
| 173 | mutex_unlock(&cdev_mutex); |
| 174 | } |
| 175 | EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all); |
| 176 | |
| 177 | struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev) |
| 178 | { |
| 179 | struct cxgbi_device *cdev, *tmp; |
| 180 | |
| 181 | mutex_lock(&cdev_mutex); |
| 182 | list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) { |
| 183 | if (cdev->lldev == lldev) { |
| 184 | mutex_unlock(&cdev_mutex); |
| 185 | return cdev; |
| 186 | } |
| 187 | } |
| 188 | mutex_unlock(&cdev_mutex); |
| 189 | log_debug(1 << CXGBI_DBG_DEV, |
| 190 | "lldev 0x%p, NO match found.\n", lldev); |
| 191 | return NULL; |
| 192 | } |
| 193 | EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev); |
| 194 | |
| 195 | static struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev, |
| 196 | int *port) |
| 197 | { |
kxie@chelsio.com | 0b3d894 | 2010-09-23 16:43:23 -0700 | [diff] [blame] | 198 | struct net_device *vdev = NULL; |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 199 | struct cxgbi_device *cdev, *tmp; |
| 200 | int i; |
| 201 | |
kxie@chelsio.com | 0b3d894 | 2010-09-23 16:43:23 -0700 | [diff] [blame] | 202 | if (ndev->priv_flags & IFF_802_1Q_VLAN) { |
| 203 | vdev = ndev; |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 204 | ndev = vlan_dev_real_dev(ndev); |
kxie@chelsio.com | 0b3d894 | 2010-09-23 16:43:23 -0700 | [diff] [blame] | 205 | log_debug(1 << CXGBI_DBG_DEV, |
| 206 | "vlan dev %s -> %s.\n", vdev->name, ndev->name); |
| 207 | } |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 208 | |
| 209 | mutex_lock(&cdev_mutex); |
| 210 | list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) { |
| 211 | for (i = 0; i < cdev->nports; i++) { |
| 212 | if (ndev == cdev->ports[i]) { |
kxie@chelsio.com | 0b3d894 | 2010-09-23 16:43:23 -0700 | [diff] [blame] | 213 | cdev->hbas[i]->vdev = vdev; |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 214 | mutex_unlock(&cdev_mutex); |
| 215 | if (port) |
| 216 | *port = i; |
| 217 | return cdev; |
| 218 | } |
| 219 | } |
| 220 | } |
| 221 | mutex_unlock(&cdev_mutex); |
| 222 | log_debug(1 << CXGBI_DBG_DEV, |
| 223 | "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name); |
| 224 | return NULL; |
| 225 | } |
| 226 | |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 227 | void cxgbi_hbas_remove(struct cxgbi_device *cdev) |
| 228 | { |
| 229 | int i; |
| 230 | struct cxgbi_hba *chba; |
| 231 | |
| 232 | log_debug(1 << CXGBI_DBG_DEV, |
| 233 | "cdev 0x%p, p#%u.\n", cdev, cdev->nports); |
| 234 | |
| 235 | for (i = 0; i < cdev->nports; i++) { |
| 236 | chba = cdev->hbas[i]; |
| 237 | if (chba) { |
| 238 | cdev->hbas[i] = NULL; |
| 239 | iscsi_host_remove(chba->shost); |
| 240 | pci_dev_put(cdev->pdev); |
| 241 | iscsi_host_free(chba->shost); |
| 242 | } |
| 243 | } |
| 244 | } |
| 245 | EXPORT_SYMBOL_GPL(cxgbi_hbas_remove); |
| 246 | |
| 247 | int cxgbi_hbas_add(struct cxgbi_device *cdev, unsigned int max_lun, |
| 248 | unsigned int max_id, struct scsi_host_template *sht, |
| 249 | struct scsi_transport_template *stt) |
| 250 | { |
| 251 | struct cxgbi_hba *chba; |
| 252 | struct Scsi_Host *shost; |
| 253 | int i, err; |
| 254 | |
| 255 | log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports); |
| 256 | |
| 257 | for (i = 0; i < cdev->nports; i++) { |
| 258 | shost = iscsi_host_alloc(sht, sizeof(*chba), 1); |
| 259 | if (!shost) { |
| 260 | pr_info("0x%p, p%d, %s, host alloc failed.\n", |
| 261 | cdev, i, cdev->ports[i]->name); |
| 262 | err = -ENOMEM; |
| 263 | goto err_out; |
| 264 | } |
| 265 | |
| 266 | shost->transportt = stt; |
| 267 | shost->max_lun = max_lun; |
| 268 | shost->max_id = max_id; |
| 269 | shost->max_channel = 0; |
| 270 | shost->max_cmd_len = 16; |
| 271 | |
| 272 | chba = iscsi_host_priv(shost); |
| 273 | chba->cdev = cdev; |
| 274 | chba->ndev = cdev->ports[i]; |
| 275 | chba->shost = shost; |
| 276 | |
| 277 | log_debug(1 << CXGBI_DBG_DEV, |
| 278 | "cdev 0x%p, p#%d %s: chba 0x%p.\n", |
| 279 | cdev, i, cdev->ports[i]->name, chba); |
| 280 | |
| 281 | pci_dev_get(cdev->pdev); |
| 282 | err = iscsi_host_add(shost, &cdev->pdev->dev); |
| 283 | if (err) { |
| 284 | pr_info("cdev 0x%p, p#%d %s, host add failed.\n", |
| 285 | cdev, i, cdev->ports[i]->name); |
| 286 | pci_dev_put(cdev->pdev); |
| 287 | scsi_host_put(shost); |
| 288 | goto err_out; |
| 289 | } |
| 290 | |
| 291 | cdev->hbas[i] = chba; |
| 292 | } |
| 293 | |
| 294 | return 0; |
| 295 | |
| 296 | err_out: |
| 297 | cxgbi_hbas_remove(cdev); |
| 298 | return err; |
| 299 | } |
| 300 | EXPORT_SYMBOL_GPL(cxgbi_hbas_add); |
| 301 | |
| 302 | /* |
| 303 | * iSCSI offload |
| 304 | * |
| 305 | * - source port management |
| 306 | * To find a free source port in the port allocation map we use a very simple |
| 307 | * rotor scheme to look for the next free port. |
| 308 | * |
| 309 | * If a source port has been specified make sure that it doesn't collide with |
| 310 | * our normal source port allocation map. If it's outside the range of our |
| 311 | * allocation/deallocation scheme just let them use it. |
| 312 | * |
| 313 | * If the source port is outside our allocation range, the caller is |
| 314 | * responsible for keeping track of their port usage. |
| 315 | */ |
| 316 | static int sock_get_port(struct cxgbi_sock *csk) |
| 317 | { |
| 318 | struct cxgbi_device *cdev = csk->cdev; |
| 319 | struct cxgbi_ports_map *pmap = &cdev->pmap; |
| 320 | unsigned int start; |
| 321 | int idx; |
| 322 | |
| 323 | if (!pmap->max_connect) { |
| 324 | pr_err("cdev 0x%p, p#%u %s, NO port map.\n", |
| 325 | cdev, csk->port_id, cdev->ports[csk->port_id]->name); |
| 326 | return -EADDRNOTAVAIL; |
| 327 | } |
| 328 | |
| 329 | if (csk->saddr.sin_port) { |
| 330 | pr_err("source port NON-ZERO %u.\n", |
| 331 | ntohs(csk->saddr.sin_port)); |
| 332 | return -EADDRINUSE; |
| 333 | } |
| 334 | |
| 335 | spin_lock_bh(&pmap->lock); |
| 336 | if (pmap->used >= pmap->max_connect) { |
| 337 | spin_unlock_bh(&pmap->lock); |
| 338 | pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n", |
| 339 | cdev, csk->port_id, cdev->ports[csk->port_id]->name); |
| 340 | return -EADDRNOTAVAIL; |
| 341 | } |
| 342 | |
| 343 | start = idx = pmap->next; |
| 344 | do { |
| 345 | if (++idx >= pmap->max_connect) |
| 346 | idx = 0; |
| 347 | if (!pmap->port_csk[idx]) { |
| 348 | pmap->used++; |
| 349 | csk->saddr.sin_port = |
| 350 | htons(pmap->sport_base + idx); |
| 351 | pmap->next = idx; |
| 352 | pmap->port_csk[idx] = csk; |
| 353 | spin_unlock_bh(&pmap->lock); |
| 354 | cxgbi_sock_get(csk); |
| 355 | log_debug(1 << CXGBI_DBG_SOCK, |
| 356 | "cdev 0x%p, p#%u %s, p %u, %u.\n", |
| 357 | cdev, csk->port_id, |
| 358 | cdev->ports[csk->port_id]->name, |
| 359 | pmap->sport_base + idx, pmap->next); |
| 360 | return 0; |
| 361 | } |
| 362 | } while (idx != start); |
| 363 | spin_unlock_bh(&pmap->lock); |
| 364 | |
| 365 | /* should not happen */ |
| 366 | pr_warn("cdev 0x%p, p#%u %s, next %u?\n", |
| 367 | cdev, csk->port_id, cdev->ports[csk->port_id]->name, |
| 368 | pmap->next); |
| 369 | return -EADDRNOTAVAIL; |
| 370 | } |
| 371 | |
| 372 | static void sock_put_port(struct cxgbi_sock *csk) |
| 373 | { |
| 374 | struct cxgbi_device *cdev = csk->cdev; |
| 375 | struct cxgbi_ports_map *pmap = &cdev->pmap; |
| 376 | |
| 377 | if (csk->saddr.sin_port) { |
| 378 | int idx = ntohs(csk->saddr.sin_port) - pmap->sport_base; |
| 379 | |
| 380 | csk->saddr.sin_port = 0; |
| 381 | if (idx < 0 || idx >= pmap->max_connect) { |
| 382 | pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n", |
| 383 | cdev, csk->port_id, |
| 384 | cdev->ports[csk->port_id]->name, |
| 385 | ntohs(csk->saddr.sin_port)); |
| 386 | return; |
| 387 | } |
| 388 | |
| 389 | spin_lock_bh(&pmap->lock); |
| 390 | pmap->port_csk[idx] = NULL; |
| 391 | pmap->used--; |
| 392 | spin_unlock_bh(&pmap->lock); |
| 393 | |
| 394 | log_debug(1 << CXGBI_DBG_SOCK, |
| 395 | "cdev 0x%p, p#%u %s, release %u.\n", |
| 396 | cdev, csk->port_id, cdev->ports[csk->port_id]->name, |
| 397 | pmap->sport_base + idx); |
| 398 | |
| 399 | cxgbi_sock_put(csk); |
| 400 | } |
| 401 | } |
| 402 | |
| 403 | /* |
| 404 | * iscsi tcp connection |
| 405 | */ |
| 406 | void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk) |
| 407 | { |
| 408 | if (csk->cpl_close) { |
| 409 | kfree_skb(csk->cpl_close); |
| 410 | csk->cpl_close = NULL; |
| 411 | } |
| 412 | if (csk->cpl_abort_req) { |
| 413 | kfree_skb(csk->cpl_abort_req); |
| 414 | csk->cpl_abort_req = NULL; |
| 415 | } |
| 416 | if (csk->cpl_abort_rpl) { |
| 417 | kfree_skb(csk->cpl_abort_rpl); |
| 418 | csk->cpl_abort_rpl = NULL; |
| 419 | } |
| 420 | } |
| 421 | EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs); |
| 422 | |
| 423 | static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev) |
| 424 | { |
| 425 | struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO); |
| 426 | |
| 427 | if (!csk) { |
| 428 | pr_info("alloc csk %zu failed.\n", sizeof(*csk)); |
| 429 | return NULL; |
| 430 | } |
| 431 | |
| 432 | if (cdev->csk_alloc_cpls(csk) < 0) { |
| 433 | pr_info("csk 0x%p, alloc cpls failed.\n", csk); |
| 434 | kfree(csk); |
| 435 | return NULL; |
| 436 | } |
| 437 | |
| 438 | spin_lock_init(&csk->lock); |
| 439 | kref_init(&csk->refcnt); |
| 440 | skb_queue_head_init(&csk->receive_queue); |
| 441 | skb_queue_head_init(&csk->write_queue); |
| 442 | setup_timer(&csk->retry_timer, NULL, (unsigned long)csk); |
| 443 | rwlock_init(&csk->callback_lock); |
| 444 | csk->cdev = cdev; |
| 445 | csk->flags = 0; |
| 446 | cxgbi_sock_set_state(csk, CTP_CLOSED); |
| 447 | |
| 448 | log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk); |
| 449 | |
| 450 | return csk; |
| 451 | } |
| 452 | |
| 453 | static struct rtable *find_route_ipv4(__be32 saddr, __be32 daddr, |
| 454 | __be16 sport, __be16 dport, u8 tos) |
| 455 | { |
| 456 | struct rtable *rt; |
| 457 | struct flowi fl = { |
| 458 | .oif = 0, |
| 459 | .nl_u = { |
| 460 | .ip4_u = { |
| 461 | .daddr = daddr, |
| 462 | .saddr = saddr, |
| 463 | .tos = tos } |
| 464 | }, |
| 465 | .proto = IPPROTO_TCP, |
| 466 | .uli_u = { |
| 467 | .ports = { |
| 468 | .sport = sport, |
| 469 | .dport = dport } |
| 470 | } |
| 471 | }; |
| 472 | |
David S. Miller | 273447b | 2011-03-01 14:27:04 -0800 | [diff] [blame^] | 473 | if (ip_route_output_flow(&init_net, &rt, &fl, NULL)) |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 474 | return NULL; |
| 475 | |
| 476 | return rt; |
| 477 | } |
| 478 | |
| 479 | static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr) |
| 480 | { |
| 481 | struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr; |
| 482 | struct dst_entry *dst; |
| 483 | struct net_device *ndev; |
| 484 | struct cxgbi_device *cdev; |
| 485 | struct rtable *rt = NULL; |
| 486 | struct cxgbi_sock *csk = NULL; |
| 487 | unsigned int mtu = 0; |
| 488 | int port = 0xFFFF; |
| 489 | int err = 0; |
| 490 | |
| 491 | if (daddr->sin_family != AF_INET) { |
| 492 | pr_info("address family 0x%x NOT supported.\n", |
| 493 | daddr->sin_family); |
| 494 | err = -EAFNOSUPPORT; |
| 495 | goto err_out; |
| 496 | } |
| 497 | |
| 498 | rt = find_route_ipv4(0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0); |
| 499 | if (!rt) { |
| 500 | pr_info("no route to ipv4 0x%x, port %u.\n", |
| 501 | daddr->sin_addr.s_addr, daddr->sin_port); |
| 502 | err = -ENETUNREACH; |
| 503 | goto err_out; |
| 504 | } |
| 505 | dst = &rt->dst; |
| 506 | ndev = dst->neighbour->dev; |
| 507 | |
| 508 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { |
| 509 | pr_info("multi-cast route %pI4, port %u, dev %s.\n", |
| 510 | &daddr->sin_addr.s_addr, ntohs(daddr->sin_port), |
| 511 | ndev->name); |
| 512 | err = -ENETUNREACH; |
| 513 | goto rel_rt; |
| 514 | } |
| 515 | |
| 516 | if (ndev->flags & IFF_LOOPBACK) { |
| 517 | ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr); |
| 518 | mtu = ndev->mtu; |
| 519 | pr_info("rt dev %s, loopback -> %s, mtu %u.\n", |
| 520 | dst->neighbour->dev->name, ndev->name, mtu); |
| 521 | } |
| 522 | |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 523 | cdev = cxgbi_device_find_by_netdev(ndev, &port); |
| 524 | if (!cdev) { |
| 525 | pr_info("dst %pI4, %s, NOT cxgbi device.\n", |
| 526 | &daddr->sin_addr.s_addr, ndev->name); |
| 527 | err = -ENETUNREACH; |
| 528 | goto rel_rt; |
| 529 | } |
| 530 | log_debug(1 << CXGBI_DBG_SOCK, |
| 531 | "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n", |
| 532 | &daddr->sin_addr.s_addr, ntohs(daddr->sin_port), |
| 533 | port, ndev->name, cdev); |
| 534 | |
| 535 | csk = cxgbi_sock_create(cdev); |
| 536 | if (!csk) { |
| 537 | err = -ENOMEM; |
| 538 | goto rel_rt; |
| 539 | } |
| 540 | csk->cdev = cdev; |
| 541 | csk->port_id = port; |
| 542 | csk->mtu = mtu; |
| 543 | csk->dst = dst; |
| 544 | csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr; |
| 545 | csk->daddr.sin_port = daddr->sin_port; |
kxie@chelsio.com | 0b3d894 | 2010-09-23 16:43:23 -0700 | [diff] [blame] | 546 | csk->saddr.sin_addr.s_addr = rt->rt_src; |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 547 | |
| 548 | return csk; |
| 549 | |
| 550 | rel_rt: |
| 551 | ip_rt_put(rt); |
| 552 | if (csk) |
| 553 | cxgbi_sock_closed(csk); |
| 554 | err_out: |
| 555 | return ERR_PTR(err); |
| 556 | } |
| 557 | |
| 558 | void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn, |
| 559 | unsigned int opt) |
| 560 | { |
| 561 | csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn; |
| 562 | dst_confirm(csk->dst); |
| 563 | smp_mb(); |
| 564 | cxgbi_sock_set_state(csk, CTP_ESTABLISHED); |
| 565 | } |
| 566 | EXPORT_SYMBOL_GPL(cxgbi_sock_established); |
| 567 | |
| 568 | static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk) |
| 569 | { |
| 570 | log_debug(1 << CXGBI_DBG_SOCK, |
| 571 | "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n", |
| 572 | csk, csk->state, csk->flags, csk->user_data); |
| 573 | |
| 574 | if (csk->state != CTP_ESTABLISHED) { |
kxie@chelsio.com | e3d2ad8 | 2010-09-23 16:43:23 -0700 | [diff] [blame] | 575 | read_lock_bh(&csk->callback_lock); |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 576 | if (csk->user_data) |
| 577 | iscsi_conn_failure(csk->user_data, |
| 578 | ISCSI_ERR_CONN_FAILED); |
kxie@chelsio.com | e3d2ad8 | 2010-09-23 16:43:23 -0700 | [diff] [blame] | 579 | read_unlock_bh(&csk->callback_lock); |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 580 | } |
| 581 | } |
| 582 | |
| 583 | void cxgbi_sock_closed(struct cxgbi_sock *csk) |
| 584 | { |
| 585 | log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n", |
| 586 | csk, (csk)->state, (csk)->flags, (csk)->tid); |
| 587 | cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED); |
| 588 | if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED) |
| 589 | return; |
| 590 | if (csk->saddr.sin_port) |
| 591 | sock_put_port(csk); |
| 592 | if (csk->dst) |
| 593 | dst_release(csk->dst); |
| 594 | csk->cdev->csk_release_offload_resources(csk); |
| 595 | cxgbi_sock_set_state(csk, CTP_CLOSED); |
| 596 | cxgbi_inform_iscsi_conn_closing(csk); |
| 597 | cxgbi_sock_put(csk); |
| 598 | } |
| 599 | EXPORT_SYMBOL_GPL(cxgbi_sock_closed); |
| 600 | |
| 601 | static void need_active_close(struct cxgbi_sock *csk) |
| 602 | { |
| 603 | int data_lost; |
| 604 | int close_req = 0; |
| 605 | |
| 606 | log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n", |
| 607 | csk, (csk)->state, (csk)->flags, (csk)->tid); |
| 608 | spin_lock_bh(&csk->lock); |
| 609 | dst_confirm(csk->dst); |
| 610 | data_lost = skb_queue_len(&csk->receive_queue); |
| 611 | __skb_queue_purge(&csk->receive_queue); |
| 612 | |
| 613 | if (csk->state == CTP_ACTIVE_OPEN) |
| 614 | cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED); |
| 615 | else if (csk->state == CTP_ESTABLISHED) { |
| 616 | close_req = 1; |
| 617 | cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE); |
| 618 | } else if (csk->state == CTP_PASSIVE_CLOSE) { |
| 619 | close_req = 1; |
| 620 | cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2); |
| 621 | } |
| 622 | |
| 623 | if (close_req) { |
| 624 | if (data_lost) |
| 625 | csk->cdev->csk_send_abort_req(csk); |
| 626 | else |
| 627 | csk->cdev->csk_send_close_req(csk); |
| 628 | } |
| 629 | |
| 630 | spin_unlock_bh(&csk->lock); |
| 631 | } |
| 632 | |
| 633 | void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno) |
| 634 | { |
| 635 | pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n", |
| 636 | csk, csk->state, csk->flags, |
| 637 | &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port, |
| 638 | &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port, |
| 639 | errno); |
| 640 | |
| 641 | cxgbi_sock_set_state(csk, CTP_CONNECTING); |
| 642 | csk->err = errno; |
| 643 | cxgbi_sock_closed(csk); |
| 644 | } |
| 645 | EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open); |
| 646 | |
| 647 | void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb) |
| 648 | { |
| 649 | struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk; |
| 650 | |
| 651 | log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n", |
| 652 | csk, (csk)->state, (csk)->flags, (csk)->tid); |
| 653 | cxgbi_sock_get(csk); |
| 654 | spin_lock_bh(&csk->lock); |
| 655 | if (csk->state == CTP_ACTIVE_OPEN) |
| 656 | cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH); |
| 657 | spin_unlock_bh(&csk->lock); |
| 658 | cxgbi_sock_put(csk); |
| 659 | __kfree_skb(skb); |
| 660 | } |
| 661 | EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure); |
| 662 | |
| 663 | void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk) |
| 664 | { |
| 665 | cxgbi_sock_get(csk); |
| 666 | spin_lock_bh(&csk->lock); |
| 667 | if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) { |
| 668 | if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_RCVD)) |
| 669 | cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD); |
| 670 | else { |
| 671 | cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_RCVD); |
| 672 | cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING); |
| 673 | if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD)) |
| 674 | pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n", |
| 675 | csk, csk->state, csk->flags, csk->tid); |
| 676 | cxgbi_sock_closed(csk); |
| 677 | } |
| 678 | } |
| 679 | spin_unlock_bh(&csk->lock); |
| 680 | cxgbi_sock_put(csk); |
| 681 | } |
| 682 | EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl); |
| 683 | |
| 684 | void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk) |
| 685 | { |
| 686 | log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n", |
| 687 | csk, (csk)->state, (csk)->flags, (csk)->tid); |
| 688 | cxgbi_sock_get(csk); |
| 689 | spin_lock_bh(&csk->lock); |
| 690 | |
| 691 | if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) |
| 692 | goto done; |
| 693 | |
| 694 | switch (csk->state) { |
| 695 | case CTP_ESTABLISHED: |
| 696 | cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE); |
| 697 | break; |
| 698 | case CTP_ACTIVE_CLOSE: |
| 699 | cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2); |
| 700 | break; |
| 701 | case CTP_CLOSE_WAIT_1: |
| 702 | cxgbi_sock_closed(csk); |
| 703 | break; |
| 704 | case CTP_ABORTING: |
| 705 | break; |
| 706 | default: |
| 707 | pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n", |
| 708 | csk, csk->state, csk->flags, csk->tid); |
| 709 | } |
| 710 | cxgbi_inform_iscsi_conn_closing(csk); |
| 711 | done: |
| 712 | spin_unlock_bh(&csk->lock); |
| 713 | cxgbi_sock_put(csk); |
| 714 | } |
| 715 | EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close); |
| 716 | |
| 717 | void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt) |
| 718 | { |
| 719 | log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n", |
| 720 | csk, (csk)->state, (csk)->flags, (csk)->tid); |
| 721 | cxgbi_sock_get(csk); |
| 722 | spin_lock_bh(&csk->lock); |
| 723 | |
| 724 | csk->snd_una = snd_nxt - 1; |
| 725 | if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) |
| 726 | goto done; |
| 727 | |
| 728 | switch (csk->state) { |
| 729 | case CTP_ACTIVE_CLOSE: |
| 730 | cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1); |
| 731 | break; |
| 732 | case CTP_CLOSE_WAIT_1: |
| 733 | case CTP_CLOSE_WAIT_2: |
| 734 | cxgbi_sock_closed(csk); |
| 735 | break; |
| 736 | case CTP_ABORTING: |
| 737 | break; |
| 738 | default: |
| 739 | pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n", |
| 740 | csk, csk->state, csk->flags, csk->tid); |
| 741 | } |
| 742 | done: |
| 743 | spin_unlock_bh(&csk->lock); |
| 744 | cxgbi_sock_put(csk); |
| 745 | } |
| 746 | EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl); |
| 747 | |
| 748 | void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits, |
| 749 | unsigned int snd_una, int seq_chk) |
| 750 | { |
| 751 | log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK, |
| 752 | "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n", |
| 753 | csk, csk->state, csk->flags, csk->tid, credits, |
| 754 | csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk); |
| 755 | |
| 756 | spin_lock_bh(&csk->lock); |
| 757 | |
| 758 | csk->wr_cred += credits; |
| 759 | if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred) |
| 760 | csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred; |
| 761 | |
| 762 | while (credits) { |
| 763 | struct sk_buff *p = cxgbi_sock_peek_wr(csk); |
| 764 | |
| 765 | if (unlikely(!p)) { |
| 766 | pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n", |
| 767 | csk, csk->state, csk->flags, csk->tid, credits, |
| 768 | csk->wr_cred, csk->wr_una_cred); |
| 769 | break; |
| 770 | } |
| 771 | |
| 772 | if (unlikely(credits < p->csum)) { |
| 773 | pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n", |
| 774 | csk, csk->state, csk->flags, csk->tid, |
| 775 | credits, csk->wr_cred, csk->wr_una_cred, |
| 776 | p->csum); |
| 777 | p->csum -= credits; |
| 778 | break; |
| 779 | } else { |
| 780 | cxgbi_sock_dequeue_wr(csk); |
| 781 | credits -= p->csum; |
| 782 | kfree_skb(p); |
| 783 | } |
| 784 | } |
| 785 | |
| 786 | cxgbi_sock_check_wr_invariants(csk); |
| 787 | |
| 788 | if (seq_chk) { |
| 789 | if (unlikely(before(snd_una, csk->snd_una))) { |
| 790 | pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.", |
| 791 | csk, csk->state, csk->flags, csk->tid, snd_una, |
| 792 | csk->snd_una); |
| 793 | goto done; |
| 794 | } |
| 795 | |
| 796 | if (csk->snd_una != snd_una) { |
| 797 | csk->snd_una = snd_una; |
| 798 | dst_confirm(csk->dst); |
| 799 | } |
| 800 | } |
| 801 | |
| 802 | if (skb_queue_len(&csk->write_queue)) { |
| 803 | if (csk->cdev->csk_push_tx_frames(csk, 0)) |
| 804 | cxgbi_conn_tx_open(csk); |
| 805 | } else |
| 806 | cxgbi_conn_tx_open(csk); |
| 807 | done: |
| 808 | spin_unlock_bh(&csk->lock); |
| 809 | } |
| 810 | EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack); |
| 811 | |
| 812 | static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk, |
| 813 | unsigned short mtu) |
| 814 | { |
| 815 | int i = 0; |
| 816 | |
| 817 | while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu) |
| 818 | ++i; |
| 819 | |
| 820 | return i; |
| 821 | } |
| 822 | |
| 823 | unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu) |
| 824 | { |
| 825 | unsigned int idx; |
| 826 | struct dst_entry *dst = csk->dst; |
| 827 | |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 828 | csk->advmss = dst_metric_advmss(dst); |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 829 | |
| 830 | if (csk->advmss > pmtu - 40) |
| 831 | csk->advmss = pmtu - 40; |
| 832 | if (csk->advmss < csk->cdev->mtus[0] - 40) |
| 833 | csk->advmss = csk->cdev->mtus[0] - 40; |
| 834 | idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40); |
| 835 | |
| 836 | return idx; |
| 837 | } |
| 838 | EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss); |
| 839 | |
| 840 | void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb) |
| 841 | { |
| 842 | cxgbi_skcb_tcp_seq(skb) = csk->write_seq; |
| 843 | __skb_queue_tail(&csk->write_queue, skb); |
| 844 | } |
| 845 | EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail); |
| 846 | |
| 847 | void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk) |
| 848 | { |
| 849 | struct sk_buff *skb; |
| 850 | |
| 851 | while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL) |
| 852 | kfree_skb(skb); |
| 853 | } |
| 854 | EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue); |
| 855 | |
| 856 | void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk) |
| 857 | { |
| 858 | int pending = cxgbi_sock_count_pending_wrs(csk); |
| 859 | |
| 860 | if (unlikely(csk->wr_cred + pending != csk->wr_max_cred)) |
| 861 | pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n", |
| 862 | csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred); |
| 863 | } |
| 864 | EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants); |
| 865 | |
| 866 | static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb) |
| 867 | { |
| 868 | struct cxgbi_device *cdev = csk->cdev; |
| 869 | struct sk_buff *next; |
| 870 | int err, copied = 0; |
| 871 | |
| 872 | spin_lock_bh(&csk->lock); |
| 873 | |
| 874 | if (csk->state != CTP_ESTABLISHED) { |
| 875 | log_debug(1 << CXGBI_DBG_PDU_TX, |
| 876 | "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n", |
| 877 | csk, csk->state, csk->flags, csk->tid); |
| 878 | err = -EAGAIN; |
| 879 | goto out_err; |
| 880 | } |
| 881 | |
| 882 | if (csk->err) { |
| 883 | log_debug(1 << CXGBI_DBG_PDU_TX, |
| 884 | "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n", |
| 885 | csk, csk->state, csk->flags, csk->tid, csk->err); |
| 886 | err = -EPIPE; |
| 887 | goto out_err; |
| 888 | } |
| 889 | |
| 890 | if (csk->write_seq - csk->snd_una >= cdev->snd_win) { |
| 891 | log_debug(1 << CXGBI_DBG_PDU_TX, |
| 892 | "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n", |
| 893 | csk, csk->state, csk->flags, csk->tid, csk->write_seq, |
| 894 | csk->snd_una, cdev->snd_win); |
| 895 | err = -ENOBUFS; |
| 896 | goto out_err; |
| 897 | } |
| 898 | |
| 899 | while (skb) { |
| 900 | int frags = skb_shinfo(skb)->nr_frags + |
| 901 | (skb->len != skb->data_len); |
| 902 | |
| 903 | if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) { |
| 904 | pr_err("csk 0x%p, skb head %u < %u.\n", |
| 905 | csk, skb_headroom(skb), cdev->skb_tx_rsvd); |
| 906 | err = -EINVAL; |
| 907 | goto out_err; |
| 908 | } |
| 909 | |
| 910 | if (frags >= SKB_WR_LIST_SIZE) { |
| 911 | pr_err("csk 0x%p, frags %d, %u,%u >%u.\n", |
| 912 | csk, skb_shinfo(skb)->nr_frags, skb->len, |
| 913 | skb->data_len, (uint)(SKB_WR_LIST_SIZE)); |
| 914 | err = -EINVAL; |
| 915 | goto out_err; |
| 916 | } |
| 917 | |
| 918 | next = skb->next; |
| 919 | skb->next = NULL; |
| 920 | cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR); |
| 921 | cxgbi_sock_skb_entail(csk, skb); |
| 922 | copied += skb->len; |
| 923 | csk->write_seq += skb->len + |
| 924 | cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb)); |
| 925 | skb = next; |
| 926 | } |
| 927 | done: |
| 928 | if (likely(skb_queue_len(&csk->write_queue))) |
| 929 | cdev->csk_push_tx_frames(csk, 1); |
| 930 | spin_unlock_bh(&csk->lock); |
| 931 | return copied; |
| 932 | |
| 933 | out_err: |
| 934 | if (copied == 0 && err == -EPIPE) |
| 935 | copied = csk->err ? csk->err : -EPIPE; |
| 936 | else |
| 937 | copied = err; |
| 938 | goto done; |
| 939 | } |
| 940 | |
| 941 | /* |
| 942 | * Direct Data Placement - |
| 943 | * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted |
| 944 | * final destination host-memory buffers based on the Initiator Task Tag (ITT) |
| 945 | * in Data-In or Target Task Tag (TTT) in Data-Out PDUs. |
| 946 | * The host memory address is programmed into h/w in the format of pagepod |
| 947 | * entries. |
| 948 | * The location of the pagepod entry is encoded into ddp tag which is used as |
| 949 | * the base for ITT/TTT. |
| 950 | */ |
| 951 | |
| 952 | static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4}; |
| 953 | static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16}; |
| 954 | static unsigned char page_idx = DDP_PGIDX_MAX; |
| 955 | |
| 956 | static unsigned char sw_tag_idx_bits; |
| 957 | static unsigned char sw_tag_age_bits; |
| 958 | |
| 959 | /* |
| 960 | * Direct-Data Placement page size adjustment |
| 961 | */ |
| 962 | static int ddp_adjust_page_table(void) |
| 963 | { |
| 964 | int i; |
| 965 | unsigned int base_order, order; |
| 966 | |
| 967 | if (PAGE_SIZE < (1UL << ddp_page_shift[0])) { |
| 968 | pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n", |
| 969 | PAGE_SIZE, 1UL << ddp_page_shift[0]); |
| 970 | return -EINVAL; |
| 971 | } |
| 972 | |
| 973 | base_order = get_order(1UL << ddp_page_shift[0]); |
| 974 | order = get_order(1UL << PAGE_SHIFT); |
| 975 | |
| 976 | for (i = 0; i < DDP_PGIDX_MAX; i++) { |
| 977 | /* first is the kernel page size, then just doubling */ |
| 978 | ddp_page_order[i] = order - base_order + i; |
| 979 | ddp_page_shift[i] = PAGE_SHIFT + i; |
| 980 | } |
| 981 | return 0; |
| 982 | } |
| 983 | |
| 984 | static int ddp_find_page_index(unsigned long pgsz) |
| 985 | { |
| 986 | int i; |
| 987 | |
| 988 | for (i = 0; i < DDP_PGIDX_MAX; i++) { |
| 989 | if (pgsz == (1UL << ddp_page_shift[i])) |
| 990 | return i; |
| 991 | } |
| 992 | pr_info("ddp page size %lu not supported.\n", pgsz); |
| 993 | return DDP_PGIDX_MAX; |
| 994 | } |
| 995 | |
| 996 | static void ddp_setup_host_page_size(void) |
| 997 | { |
| 998 | if (page_idx == DDP_PGIDX_MAX) { |
| 999 | page_idx = ddp_find_page_index(PAGE_SIZE); |
| 1000 | |
| 1001 | if (page_idx == DDP_PGIDX_MAX) { |
| 1002 | pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE); |
| 1003 | if (ddp_adjust_page_table() < 0) { |
| 1004 | pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE); |
| 1005 | return; |
| 1006 | } |
| 1007 | page_idx = ddp_find_page_index(PAGE_SIZE); |
| 1008 | } |
| 1009 | pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx); |
| 1010 | } |
| 1011 | } |
| 1012 | |
| 1013 | void cxgbi_ddp_page_size_factor(int *pgsz_factor) |
| 1014 | { |
| 1015 | int i; |
| 1016 | |
| 1017 | for (i = 0; i < DDP_PGIDX_MAX; i++) |
| 1018 | pgsz_factor[i] = ddp_page_order[i]; |
| 1019 | } |
| 1020 | EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor); |
| 1021 | |
| 1022 | /* |
| 1023 | * DDP setup & teardown |
| 1024 | */ |
| 1025 | |
| 1026 | void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod, |
| 1027 | struct cxgbi_pagepod_hdr *hdr, |
| 1028 | struct cxgbi_gather_list *gl, unsigned int gidx) |
| 1029 | { |
| 1030 | int i; |
| 1031 | |
| 1032 | memcpy(ppod, hdr, sizeof(*hdr)); |
| 1033 | for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) { |
| 1034 | ppod->addr[i] = gidx < gl->nelem ? |
| 1035 | cpu_to_be64(gl->phys_addr[gidx]) : 0ULL; |
| 1036 | } |
| 1037 | } |
| 1038 | EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set); |
| 1039 | |
| 1040 | void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod) |
| 1041 | { |
| 1042 | memset(ppod, 0, sizeof(*ppod)); |
| 1043 | } |
| 1044 | EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear); |
| 1045 | |
| 1046 | static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp, |
| 1047 | unsigned int start, unsigned int max, |
| 1048 | unsigned int count, |
| 1049 | struct cxgbi_gather_list *gl) |
| 1050 | { |
| 1051 | unsigned int i, j, k; |
| 1052 | |
| 1053 | /* not enough entries */ |
| 1054 | if ((max - start) < count) { |
| 1055 | log_debug(1 << CXGBI_DBG_DDP, |
| 1056 | "NOT enough entries %u+%u < %u.\n", start, count, max); |
| 1057 | return -EBUSY; |
| 1058 | } |
| 1059 | |
| 1060 | max -= count; |
| 1061 | spin_lock(&ddp->map_lock); |
| 1062 | for (i = start; i < max;) { |
| 1063 | for (j = 0, k = i; j < count; j++, k++) { |
| 1064 | if (ddp->gl_map[k]) |
| 1065 | break; |
| 1066 | } |
| 1067 | if (j == count) { |
| 1068 | for (j = 0, k = i; j < count; j++, k++) |
| 1069 | ddp->gl_map[k] = gl; |
| 1070 | spin_unlock(&ddp->map_lock); |
| 1071 | return i; |
| 1072 | } |
| 1073 | i += j + 1; |
| 1074 | } |
| 1075 | spin_unlock(&ddp->map_lock); |
| 1076 | log_debug(1 << CXGBI_DBG_DDP, |
| 1077 | "NO suitable entries %u available.\n", count); |
| 1078 | return -EBUSY; |
| 1079 | } |
| 1080 | |
| 1081 | static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp, |
| 1082 | int start, int count) |
| 1083 | { |
| 1084 | spin_lock(&ddp->map_lock); |
| 1085 | memset(&ddp->gl_map[start], 0, |
| 1086 | count * sizeof(struct cxgbi_gather_list *)); |
| 1087 | spin_unlock(&ddp->map_lock); |
| 1088 | } |
| 1089 | |
| 1090 | static inline void ddp_gl_unmap(struct pci_dev *pdev, |
| 1091 | struct cxgbi_gather_list *gl) |
| 1092 | { |
| 1093 | int i; |
| 1094 | |
| 1095 | for (i = 0; i < gl->nelem; i++) |
| 1096 | dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE, |
| 1097 | PCI_DMA_FROMDEVICE); |
| 1098 | } |
| 1099 | |
| 1100 | static inline int ddp_gl_map(struct pci_dev *pdev, |
| 1101 | struct cxgbi_gather_list *gl) |
| 1102 | { |
| 1103 | int i; |
| 1104 | |
| 1105 | for (i = 0; i < gl->nelem; i++) { |
| 1106 | gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0, |
| 1107 | PAGE_SIZE, |
| 1108 | PCI_DMA_FROMDEVICE); |
| 1109 | if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) { |
| 1110 | log_debug(1 << CXGBI_DBG_DDP, |
| 1111 | "page %d 0x%p, 0x%p dma mapping err.\n", |
| 1112 | i, gl->pages[i], pdev); |
| 1113 | goto unmap; |
| 1114 | } |
| 1115 | } |
| 1116 | return i; |
| 1117 | unmap: |
| 1118 | if (i) { |
| 1119 | unsigned int nelem = gl->nelem; |
| 1120 | |
| 1121 | gl->nelem = i; |
| 1122 | ddp_gl_unmap(pdev, gl); |
| 1123 | gl->nelem = nelem; |
| 1124 | } |
| 1125 | return -EINVAL; |
| 1126 | } |
| 1127 | |
| 1128 | static void ddp_release_gl(struct cxgbi_gather_list *gl, |
| 1129 | struct pci_dev *pdev) |
| 1130 | { |
| 1131 | ddp_gl_unmap(pdev, gl); |
| 1132 | kfree(gl); |
| 1133 | } |
| 1134 | |
| 1135 | static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen, |
| 1136 | struct scatterlist *sgl, |
| 1137 | unsigned int sgcnt, |
| 1138 | struct pci_dev *pdev, |
| 1139 | gfp_t gfp) |
| 1140 | { |
| 1141 | struct cxgbi_gather_list *gl; |
| 1142 | struct scatterlist *sg = sgl; |
| 1143 | struct page *sgpage = sg_page(sg); |
| 1144 | unsigned int sglen = sg->length; |
| 1145 | unsigned int sgoffset = sg->offset; |
| 1146 | unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >> |
| 1147 | PAGE_SHIFT; |
| 1148 | int i = 1, j = 0; |
| 1149 | |
| 1150 | if (xferlen < DDP_THRESHOLD) { |
| 1151 | log_debug(1 << CXGBI_DBG_DDP, |
| 1152 | "xfer %u < threshold %u, no ddp.\n", |
| 1153 | xferlen, DDP_THRESHOLD); |
| 1154 | return NULL; |
| 1155 | } |
| 1156 | |
| 1157 | gl = kzalloc(sizeof(struct cxgbi_gather_list) + |
| 1158 | npages * (sizeof(dma_addr_t) + |
| 1159 | sizeof(struct page *)), gfp); |
| 1160 | if (!gl) { |
| 1161 | log_debug(1 << CXGBI_DBG_DDP, |
| 1162 | "xfer %u, %u pages, OOM.\n", xferlen, npages); |
| 1163 | return NULL; |
| 1164 | } |
| 1165 | |
| 1166 | log_debug(1 << CXGBI_DBG_DDP, |
| 1167 | "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages); |
| 1168 | |
| 1169 | gl->pages = (struct page **)&gl->phys_addr[npages]; |
| 1170 | gl->nelem = npages; |
| 1171 | gl->length = xferlen; |
| 1172 | gl->offset = sgoffset; |
| 1173 | gl->pages[0] = sgpage; |
| 1174 | |
| 1175 | for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt; |
| 1176 | i++, sg = sg_next(sg)) { |
| 1177 | struct page *page = sg_page(sg); |
| 1178 | |
| 1179 | if (sgpage == page && sg->offset == sgoffset + sglen) |
| 1180 | sglen += sg->length; |
| 1181 | else { |
| 1182 | /* make sure the sgl is fit for ddp: |
| 1183 | * each has the same page size, and |
| 1184 | * all of the middle pages are used completely |
| 1185 | */ |
| 1186 | if ((j && sgoffset) || ((i != sgcnt - 1) && |
| 1187 | ((sglen + sgoffset) & ~PAGE_MASK))) { |
| 1188 | log_debug(1 << CXGBI_DBG_DDP, |
| 1189 | "page %d/%u, %u + %u.\n", |
| 1190 | i, sgcnt, sgoffset, sglen); |
| 1191 | goto error_out; |
| 1192 | } |
| 1193 | |
| 1194 | j++; |
| 1195 | if (j == gl->nelem || sg->offset) { |
| 1196 | log_debug(1 << CXGBI_DBG_DDP, |
| 1197 | "page %d/%u, offset %u.\n", |
| 1198 | j, gl->nelem, sg->offset); |
| 1199 | goto error_out; |
| 1200 | } |
| 1201 | gl->pages[j] = page; |
| 1202 | sglen = sg->length; |
| 1203 | sgoffset = sg->offset; |
| 1204 | sgpage = page; |
| 1205 | } |
| 1206 | } |
| 1207 | gl->nelem = ++j; |
| 1208 | |
| 1209 | if (ddp_gl_map(pdev, gl) < 0) |
| 1210 | goto error_out; |
| 1211 | |
| 1212 | return gl; |
| 1213 | |
| 1214 | error_out: |
| 1215 | kfree(gl); |
| 1216 | return NULL; |
| 1217 | } |
| 1218 | |
| 1219 | static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag) |
| 1220 | { |
| 1221 | struct cxgbi_device *cdev = chba->cdev; |
| 1222 | struct cxgbi_ddp_info *ddp = cdev->ddp; |
| 1223 | u32 idx; |
| 1224 | |
| 1225 | idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask; |
| 1226 | if (idx < ddp->nppods) { |
| 1227 | struct cxgbi_gather_list *gl = ddp->gl_map[idx]; |
| 1228 | unsigned int npods; |
| 1229 | |
| 1230 | if (!gl || !gl->nelem) { |
| 1231 | pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n", |
| 1232 | tag, idx, gl, gl ? gl->nelem : 0); |
| 1233 | return; |
| 1234 | } |
| 1235 | npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT; |
| 1236 | log_debug(1 << CXGBI_DBG_DDP, |
| 1237 | "tag 0x%x, release idx %u, npods %u.\n", |
| 1238 | tag, idx, npods); |
| 1239 | cdev->csk_ddp_clear(chba, tag, idx, npods); |
| 1240 | ddp_unmark_entries(ddp, idx, npods); |
| 1241 | ddp_release_gl(gl, ddp->pdev); |
| 1242 | } else |
| 1243 | pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods); |
| 1244 | } |
| 1245 | |
| 1246 | static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid, |
| 1247 | u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl, |
| 1248 | gfp_t gfp) |
| 1249 | { |
| 1250 | struct cxgbi_device *cdev = csk->cdev; |
| 1251 | struct cxgbi_ddp_info *ddp = cdev->ddp; |
| 1252 | struct cxgbi_tag_format *tformat = &cdev->tag_format; |
| 1253 | struct cxgbi_pagepod_hdr hdr; |
| 1254 | unsigned int npods; |
| 1255 | int idx = -1; |
| 1256 | int err = -ENOMEM; |
| 1257 | u32 tag; |
| 1258 | |
| 1259 | npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT; |
| 1260 | if (ddp->idx_last == ddp->nppods) |
| 1261 | idx = ddp_find_unused_entries(ddp, 0, ddp->nppods, |
| 1262 | npods, gl); |
| 1263 | else { |
| 1264 | idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1, |
| 1265 | ddp->nppods, npods, |
| 1266 | gl); |
| 1267 | if (idx < 0 && ddp->idx_last >= npods) { |
| 1268 | idx = ddp_find_unused_entries(ddp, 0, |
| 1269 | min(ddp->idx_last + npods, ddp->nppods), |
| 1270 | npods, gl); |
| 1271 | } |
| 1272 | } |
| 1273 | if (idx < 0) { |
| 1274 | log_debug(1 << CXGBI_DBG_DDP, |
| 1275 | "xferlen %u, gl %u, npods %u NO DDP.\n", |
| 1276 | gl->length, gl->nelem, npods); |
| 1277 | return idx; |
| 1278 | } |
| 1279 | |
| 1280 | if (cdev->csk_ddp_alloc_gl_skb) { |
| 1281 | err = cdev->csk_ddp_alloc_gl_skb(ddp, idx, npods, gfp); |
| 1282 | if (err < 0) |
| 1283 | goto unmark_entries; |
| 1284 | } |
| 1285 | |
| 1286 | tag = cxgbi_ddp_tag_base(tformat, sw_tag); |
| 1287 | tag |= idx << PPOD_IDX_SHIFT; |
| 1288 | |
| 1289 | hdr.rsvd = 0; |
| 1290 | hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid)); |
| 1291 | hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask); |
| 1292 | hdr.max_offset = htonl(gl->length); |
| 1293 | hdr.page_offset = htonl(gl->offset); |
| 1294 | |
| 1295 | err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl); |
| 1296 | if (err < 0) { |
| 1297 | if (cdev->csk_ddp_free_gl_skb) |
| 1298 | cdev->csk_ddp_free_gl_skb(ddp, idx, npods); |
| 1299 | goto unmark_entries; |
| 1300 | } |
| 1301 | |
| 1302 | ddp->idx_last = idx; |
| 1303 | log_debug(1 << CXGBI_DBG_DDP, |
| 1304 | "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n", |
| 1305 | gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx, |
| 1306 | npods); |
| 1307 | *tagp = tag; |
| 1308 | return 0; |
| 1309 | |
| 1310 | unmark_entries: |
| 1311 | ddp_unmark_entries(ddp, idx, npods); |
| 1312 | return err; |
| 1313 | } |
| 1314 | |
| 1315 | int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp, |
| 1316 | unsigned int sw_tag, unsigned int xferlen, |
| 1317 | struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp) |
| 1318 | { |
| 1319 | struct cxgbi_device *cdev = csk->cdev; |
| 1320 | struct cxgbi_tag_format *tformat = &cdev->tag_format; |
| 1321 | struct cxgbi_gather_list *gl; |
| 1322 | int err; |
| 1323 | |
| 1324 | if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp || |
| 1325 | xferlen < DDP_THRESHOLD) { |
| 1326 | log_debug(1 << CXGBI_DBG_DDP, |
| 1327 | "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen); |
| 1328 | return -EINVAL; |
| 1329 | } |
| 1330 | |
| 1331 | if (!cxgbi_sw_tag_usable(tformat, sw_tag)) { |
| 1332 | log_debug(1 << CXGBI_DBG_DDP, |
| 1333 | "sw_tag 0x%x NOT usable.\n", sw_tag); |
| 1334 | return -EINVAL; |
| 1335 | } |
| 1336 | |
| 1337 | gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp); |
| 1338 | if (!gl) |
| 1339 | return -ENOMEM; |
| 1340 | |
| 1341 | err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp); |
| 1342 | if (err < 0) |
| 1343 | ddp_release_gl(gl, cdev->pdev); |
| 1344 | |
| 1345 | return err; |
| 1346 | } |
| 1347 | |
| 1348 | static void ddp_destroy(struct kref *kref) |
| 1349 | { |
| 1350 | struct cxgbi_ddp_info *ddp = container_of(kref, |
| 1351 | struct cxgbi_ddp_info, |
| 1352 | refcnt); |
| 1353 | struct cxgbi_device *cdev = ddp->cdev; |
| 1354 | int i = 0; |
| 1355 | |
| 1356 | pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev); |
| 1357 | |
| 1358 | while (i < ddp->nppods) { |
| 1359 | struct cxgbi_gather_list *gl = ddp->gl_map[i]; |
| 1360 | |
| 1361 | if (gl) { |
| 1362 | int npods = (gl->nelem + PPOD_PAGES_MAX - 1) |
| 1363 | >> PPOD_PAGES_SHIFT; |
| 1364 | pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods); |
| 1365 | kfree(gl); |
| 1366 | if (cdev->csk_ddp_free_gl_skb) |
| 1367 | cdev->csk_ddp_free_gl_skb(ddp, i, npods); |
| 1368 | i += npods; |
| 1369 | } else |
| 1370 | i++; |
| 1371 | } |
| 1372 | cxgbi_free_big_mem(ddp); |
| 1373 | } |
| 1374 | |
| 1375 | int cxgbi_ddp_cleanup(struct cxgbi_device *cdev) |
| 1376 | { |
| 1377 | struct cxgbi_ddp_info *ddp = cdev->ddp; |
| 1378 | |
| 1379 | log_debug(1 << CXGBI_DBG_DDP, |
| 1380 | "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp); |
| 1381 | cdev->ddp = NULL; |
| 1382 | if (ddp) |
| 1383 | return kref_put(&ddp->refcnt, ddp_destroy); |
| 1384 | return 0; |
| 1385 | } |
| 1386 | EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup); |
| 1387 | |
| 1388 | int cxgbi_ddp_init(struct cxgbi_device *cdev, |
| 1389 | unsigned int llimit, unsigned int ulimit, |
| 1390 | unsigned int max_txsz, unsigned int max_rxsz) |
| 1391 | { |
| 1392 | struct cxgbi_ddp_info *ddp; |
| 1393 | unsigned int ppmax, bits; |
| 1394 | |
| 1395 | ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT; |
| 1396 | bits = __ilog2_u32(ppmax) + 1; |
| 1397 | if (bits > PPOD_IDX_MAX_SIZE) |
| 1398 | bits = PPOD_IDX_MAX_SIZE; |
| 1399 | ppmax = (1 << (bits - 1)) - 1; |
| 1400 | |
| 1401 | ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) + |
| 1402 | ppmax * (sizeof(struct cxgbi_gather_list *) + |
| 1403 | sizeof(struct sk_buff *)), |
| 1404 | GFP_KERNEL); |
| 1405 | if (!ddp) { |
| 1406 | pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax); |
| 1407 | return -ENOMEM; |
| 1408 | } |
| 1409 | ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1); |
| 1410 | ddp->gl_skb = (struct sk_buff **)(((char *)ddp->gl_map) + |
| 1411 | ppmax * sizeof(struct cxgbi_gather_list *)); |
| 1412 | cdev->ddp = ddp; |
| 1413 | |
| 1414 | spin_lock_init(&ddp->map_lock); |
| 1415 | kref_init(&ddp->refcnt); |
| 1416 | |
| 1417 | ddp->cdev = cdev; |
| 1418 | ddp->pdev = cdev->pdev; |
| 1419 | ddp->llimit = llimit; |
| 1420 | ddp->ulimit = ulimit; |
| 1421 | ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE); |
| 1422 | ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE); |
| 1423 | ddp->nppods = ppmax; |
| 1424 | ddp->idx_last = ppmax; |
| 1425 | ddp->idx_bits = bits; |
| 1426 | ddp->idx_mask = (1 << bits) - 1; |
| 1427 | ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1; |
| 1428 | |
| 1429 | cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits; |
| 1430 | cdev->tag_format.rsvd_bits = ddp->idx_bits; |
| 1431 | cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT; |
| 1432 | cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1; |
| 1433 | |
| 1434 | pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n", |
| 1435 | cdev->ports[0]->name, cdev->tag_format.sw_bits, |
| 1436 | cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift, |
| 1437 | cdev->tag_format.rsvd_mask); |
| 1438 | |
| 1439 | cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD, |
| 1440 | ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN); |
| 1441 | cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD, |
| 1442 | ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN); |
| 1443 | |
| 1444 | log_debug(1 << CXGBI_DBG_DDP, |
| 1445 | "%s max payload size: %u/%u, %u/%u.\n", |
| 1446 | cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz, |
| 1447 | cdev->rx_max_size, ddp->max_rxsz); |
| 1448 | return 0; |
| 1449 | } |
| 1450 | EXPORT_SYMBOL_GPL(cxgbi_ddp_init); |
| 1451 | |
| 1452 | /* |
| 1453 | * APIs interacting with open-iscsi libraries |
| 1454 | */ |
| 1455 | |
| 1456 | static unsigned char padding[4]; |
| 1457 | |
| 1458 | static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt) |
| 1459 | { |
| 1460 | struct scsi_cmnd *sc = task->sc; |
| 1461 | struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data; |
| 1462 | struct cxgbi_conn *cconn = tcp_conn->dd_data; |
| 1463 | struct cxgbi_hba *chba = cconn->chba; |
| 1464 | struct cxgbi_tag_format *tformat = &chba->cdev->tag_format; |
| 1465 | u32 tag = ntohl((__force u32)hdr_itt); |
| 1466 | |
| 1467 | log_debug(1 << CXGBI_DBG_DDP, |
| 1468 | "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag); |
| 1469 | if (sc && |
| 1470 | (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) && |
| 1471 | cxgbi_is_ddp_tag(tformat, tag)) |
| 1472 | ddp_tag_release(chba, tag); |
| 1473 | } |
| 1474 | |
| 1475 | static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt) |
| 1476 | { |
| 1477 | struct scsi_cmnd *sc = task->sc; |
| 1478 | struct iscsi_conn *conn = task->conn; |
| 1479 | struct iscsi_session *sess = conn->session; |
| 1480 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| 1481 | struct cxgbi_conn *cconn = tcp_conn->dd_data; |
| 1482 | struct cxgbi_hba *chba = cconn->chba; |
| 1483 | struct cxgbi_tag_format *tformat = &chba->cdev->tag_format; |
| 1484 | u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt; |
| 1485 | u32 tag = 0; |
| 1486 | int err = -EINVAL; |
| 1487 | |
| 1488 | if (sc && |
| 1489 | (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) { |
| 1490 | err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag, |
| 1491 | scsi_in(sc)->length, |
| 1492 | scsi_in(sc)->table.sgl, |
| 1493 | scsi_in(sc)->table.nents, |
| 1494 | GFP_ATOMIC); |
| 1495 | if (err < 0) |
| 1496 | log_debug(1 << CXGBI_DBG_DDP, |
| 1497 | "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n", |
| 1498 | cconn->cep->csk, task, scsi_in(sc)->length, |
| 1499 | scsi_in(sc)->table.nents); |
| 1500 | } |
| 1501 | |
| 1502 | if (err < 0) |
| 1503 | tag = cxgbi_set_non_ddp_tag(tformat, sw_tag); |
| 1504 | /* the itt need to sent in big-endian order */ |
| 1505 | *hdr_itt = (__force itt_t)htonl(tag); |
| 1506 | |
| 1507 | log_debug(1 << CXGBI_DBG_DDP, |
| 1508 | "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n", |
| 1509 | chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt); |
| 1510 | return 0; |
| 1511 | } |
| 1512 | |
| 1513 | void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age) |
| 1514 | { |
| 1515 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| 1516 | struct cxgbi_conn *cconn = tcp_conn->dd_data; |
| 1517 | struct cxgbi_device *cdev = cconn->chba->cdev; |
| 1518 | u32 tag = ntohl((__force u32) itt); |
| 1519 | u32 sw_bits; |
| 1520 | |
| 1521 | sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag); |
| 1522 | if (idx) |
| 1523 | *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1); |
| 1524 | if (age) |
| 1525 | *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK; |
| 1526 | |
| 1527 | log_debug(1 << CXGBI_DBG_DDP, |
| 1528 | "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n", |
| 1529 | cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF, |
| 1530 | age ? *age : 0xFF); |
| 1531 | } |
| 1532 | EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt); |
| 1533 | |
| 1534 | void cxgbi_conn_tx_open(struct cxgbi_sock *csk) |
| 1535 | { |
| 1536 | struct iscsi_conn *conn = csk->user_data; |
| 1537 | |
| 1538 | if (conn) { |
| 1539 | log_debug(1 << CXGBI_DBG_SOCK, |
| 1540 | "csk 0x%p, cid %d.\n", csk, conn->id); |
| 1541 | iscsi_conn_queue_work(conn); |
| 1542 | } |
| 1543 | } |
| 1544 | EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open); |
| 1545 | |
| 1546 | /* |
| 1547 | * pdu receive, interact with libiscsi_tcp |
| 1548 | */ |
| 1549 | static inline int read_pdu_skb(struct iscsi_conn *conn, |
| 1550 | struct sk_buff *skb, |
| 1551 | unsigned int offset, |
| 1552 | int offloaded) |
| 1553 | { |
| 1554 | int status = 0; |
| 1555 | int bytes_read; |
| 1556 | |
| 1557 | bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status); |
| 1558 | switch (status) { |
| 1559 | case ISCSI_TCP_CONN_ERR: |
| 1560 | pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n", |
| 1561 | skb, offset, offloaded); |
| 1562 | return -EIO; |
| 1563 | case ISCSI_TCP_SUSPENDED: |
| 1564 | log_debug(1 << CXGBI_DBG_PDU_RX, |
| 1565 | "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n", |
| 1566 | skb, offset, offloaded, bytes_read); |
| 1567 | /* no transfer - just have caller flush queue */ |
| 1568 | return bytes_read; |
| 1569 | case ISCSI_TCP_SKB_DONE: |
| 1570 | pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n", |
| 1571 | skb, offset, offloaded); |
| 1572 | /* |
| 1573 | * pdus should always fit in the skb and we should get |
| 1574 | * segment done notifcation. |
| 1575 | */ |
| 1576 | iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb."); |
| 1577 | return -EFAULT; |
| 1578 | case ISCSI_TCP_SEGMENT_DONE: |
| 1579 | log_debug(1 << CXGBI_DBG_PDU_RX, |
| 1580 | "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n", |
| 1581 | skb, offset, offloaded, bytes_read); |
| 1582 | return bytes_read; |
| 1583 | default: |
| 1584 | pr_info("skb 0x%p, off %u, %d, invalid status %d.\n", |
| 1585 | skb, offset, offloaded, status); |
| 1586 | return -EINVAL; |
| 1587 | } |
| 1588 | } |
| 1589 | |
| 1590 | static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb) |
| 1591 | { |
| 1592 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| 1593 | |
| 1594 | log_debug(1 << CXGBI_DBG_PDU_RX, |
| 1595 | "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n", |
| 1596 | conn, skb, skb->len, cxgbi_skcb_flags(skb)); |
| 1597 | |
| 1598 | if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) { |
| 1599 | pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb); |
| 1600 | iscsi_conn_failure(conn, ISCSI_ERR_PROTO); |
| 1601 | return -EIO; |
| 1602 | } |
| 1603 | |
| 1604 | if (conn->hdrdgst_en && |
| 1605 | cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) { |
| 1606 | pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb); |
| 1607 | iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST); |
| 1608 | return -EIO; |
| 1609 | } |
| 1610 | |
| 1611 | return read_pdu_skb(conn, skb, 0, 0); |
| 1612 | } |
| 1613 | |
| 1614 | static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb, |
| 1615 | struct sk_buff *skb, unsigned int offset) |
| 1616 | { |
| 1617 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| 1618 | bool offloaded = 0; |
| 1619 | int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK; |
| 1620 | |
| 1621 | log_debug(1 << CXGBI_DBG_PDU_RX, |
| 1622 | "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n", |
| 1623 | conn, skb, skb->len, cxgbi_skcb_flags(skb)); |
| 1624 | |
| 1625 | if (conn->datadgst_en && |
| 1626 | cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) { |
| 1627 | pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n", |
| 1628 | conn, lskb, cxgbi_skcb_flags(lskb)); |
| 1629 | iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST); |
| 1630 | return -EIO; |
| 1631 | } |
| 1632 | |
| 1633 | if (iscsi_tcp_recv_segment_is_hdr(tcp_conn)) |
| 1634 | return 0; |
| 1635 | |
| 1636 | /* coalesced, add header digest length */ |
| 1637 | if (lskb == skb && conn->hdrdgst_en) |
| 1638 | offset += ISCSI_DIGEST_SIZE; |
| 1639 | |
| 1640 | if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD)) |
| 1641 | offloaded = 1; |
| 1642 | |
| 1643 | if (opcode == ISCSI_OP_SCSI_DATA_IN) |
| 1644 | log_debug(1 << CXGBI_DBG_PDU_RX, |
| 1645 | "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n", |
| 1646 | skb, opcode, ntohl(tcp_conn->in.hdr->itt), |
| 1647 | tcp_conn->in.datalen, offloaded ? "is" : "not"); |
| 1648 | |
| 1649 | return read_pdu_skb(conn, skb, offset, offloaded); |
| 1650 | } |
| 1651 | |
| 1652 | static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied) |
| 1653 | { |
| 1654 | struct cxgbi_device *cdev = csk->cdev; |
| 1655 | int must_send; |
| 1656 | u32 credits; |
| 1657 | |
| 1658 | log_debug(1 << CXGBI_DBG_PDU_RX, |
| 1659 | "csk 0x%p,%u,0x%lu,%u, seq %u, wup %u, thre %u, %u.\n", |
| 1660 | csk, csk->state, csk->flags, csk->tid, csk->copied_seq, |
| 1661 | csk->rcv_wup, cdev->rx_credit_thres, |
| 1662 | cdev->rcv_win); |
| 1663 | |
| 1664 | if (csk->state != CTP_ESTABLISHED) |
| 1665 | return; |
| 1666 | |
| 1667 | credits = csk->copied_seq - csk->rcv_wup; |
| 1668 | if (unlikely(!credits)) |
| 1669 | return; |
| 1670 | if (unlikely(cdev->rx_credit_thres == 0)) |
| 1671 | return; |
| 1672 | |
| 1673 | must_send = credits + 16384 >= cdev->rcv_win; |
| 1674 | if (must_send || credits >= cdev->rx_credit_thres) |
| 1675 | csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits); |
| 1676 | } |
| 1677 | |
| 1678 | void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk) |
| 1679 | { |
| 1680 | struct cxgbi_device *cdev = csk->cdev; |
| 1681 | struct iscsi_conn *conn = csk->user_data; |
| 1682 | struct sk_buff *skb; |
| 1683 | unsigned int read = 0; |
| 1684 | int err = 0; |
| 1685 | |
| 1686 | log_debug(1 << CXGBI_DBG_PDU_RX, |
| 1687 | "csk 0x%p, conn 0x%p.\n", csk, conn); |
| 1688 | |
| 1689 | if (unlikely(!conn || conn->suspend_rx)) { |
| 1690 | log_debug(1 << CXGBI_DBG_PDU_RX, |
| 1691 | "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n", |
| 1692 | csk, conn, conn ? conn->id : 0xFF, |
| 1693 | conn ? conn->suspend_rx : 0xFF); |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 1694 | return; |
| 1695 | } |
| 1696 | |
| 1697 | while (!err) { |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 1698 | skb = skb_peek(&csk->receive_queue); |
| 1699 | if (!skb || |
| 1700 | !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) { |
| 1701 | if (skb) |
| 1702 | log_debug(1 << CXGBI_DBG_PDU_RX, |
| 1703 | "skb 0x%p, NOT ready 0x%lx.\n", |
| 1704 | skb, cxgbi_skcb_flags(skb)); |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 1705 | break; |
| 1706 | } |
| 1707 | __skb_unlink(skb, &csk->receive_queue); |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 1708 | |
| 1709 | read += cxgbi_skcb_rx_pdulen(skb); |
| 1710 | log_debug(1 << CXGBI_DBG_PDU_RX, |
| 1711 | "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n", |
| 1712 | csk, skb, skb->len, cxgbi_skcb_flags(skb), |
| 1713 | cxgbi_skcb_rx_pdulen(skb)); |
| 1714 | |
| 1715 | if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) { |
| 1716 | err = skb_read_pdu_bhs(conn, skb); |
kxie@chelsio.com | e3d2ad8 | 2010-09-23 16:43:23 -0700 | [diff] [blame] | 1717 | if (err < 0) { |
| 1718 | pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, " |
| 1719 | "f 0x%lx, plen %u.\n", |
| 1720 | csk, skb, skb->len, |
| 1721 | cxgbi_skcb_flags(skb), |
| 1722 | cxgbi_skcb_rx_pdulen(skb)); |
| 1723 | goto skb_done; |
| 1724 | } |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 1725 | err = skb_read_pdu_data(conn, skb, skb, |
| 1726 | err + cdev->skb_rx_extra); |
kxie@chelsio.com | e3d2ad8 | 2010-09-23 16:43:23 -0700 | [diff] [blame] | 1727 | if (err < 0) |
| 1728 | pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, " |
| 1729 | "f 0x%lx, plen %u.\n", |
| 1730 | csk, skb, skb->len, |
| 1731 | cxgbi_skcb_flags(skb), |
| 1732 | cxgbi_skcb_rx_pdulen(skb)); |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 1733 | } else { |
| 1734 | err = skb_read_pdu_bhs(conn, skb); |
kxie@chelsio.com | e3d2ad8 | 2010-09-23 16:43:23 -0700 | [diff] [blame] | 1735 | if (err < 0) { |
| 1736 | pr_err("bhs, csk 0x%p, skb 0x%p,%u, " |
| 1737 | "f 0x%lx, plen %u.\n", |
| 1738 | csk, skb, skb->len, |
| 1739 | cxgbi_skcb_flags(skb), |
| 1740 | cxgbi_skcb_rx_pdulen(skb)); |
| 1741 | goto skb_done; |
| 1742 | } |
| 1743 | |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 1744 | if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) { |
| 1745 | struct sk_buff *dskb; |
| 1746 | |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 1747 | dskb = skb_peek(&csk->receive_queue); |
| 1748 | if (!dskb) { |
kxie@chelsio.com | e3d2ad8 | 2010-09-23 16:43:23 -0700 | [diff] [blame] | 1749 | pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx," |
| 1750 | " plen %u, NO data.\n", |
| 1751 | csk, skb, skb->len, |
| 1752 | cxgbi_skcb_flags(skb), |
| 1753 | cxgbi_skcb_rx_pdulen(skb)); |
| 1754 | err = -EIO; |
| 1755 | goto skb_done; |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 1756 | } |
| 1757 | __skb_unlink(dskb, &csk->receive_queue); |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 1758 | |
| 1759 | err = skb_read_pdu_data(conn, skb, dskb, 0); |
kxie@chelsio.com | e3d2ad8 | 2010-09-23 16:43:23 -0700 | [diff] [blame] | 1760 | if (err < 0) |
| 1761 | pr_err("data, csk 0x%p, skb 0x%p,%u, " |
| 1762 | "f 0x%lx, plen %u, dskb 0x%p," |
| 1763 | "%u.\n", |
| 1764 | csk, skb, skb->len, |
| 1765 | cxgbi_skcb_flags(skb), |
| 1766 | cxgbi_skcb_rx_pdulen(skb), |
| 1767 | dskb, dskb->len); |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 1768 | __kfree_skb(dskb); |
| 1769 | } else |
| 1770 | err = skb_read_pdu_data(conn, skb, skb, 0); |
| 1771 | } |
kxie@chelsio.com | e3d2ad8 | 2010-09-23 16:43:23 -0700 | [diff] [blame] | 1772 | skb_done: |
| 1773 | __kfree_skb(skb); |
| 1774 | |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 1775 | if (err < 0) |
| 1776 | break; |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 1777 | } |
| 1778 | |
| 1779 | log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read); |
| 1780 | if (read) { |
| 1781 | csk->copied_seq += read; |
| 1782 | csk_return_rx_credits(csk, read); |
| 1783 | conn->rxdata_octets += read; |
| 1784 | } |
| 1785 | |
| 1786 | if (err < 0) { |
kxie@chelsio.com | e3d2ad8 | 2010-09-23 16:43:23 -0700 | [diff] [blame] | 1787 | pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n", |
| 1788 | csk, conn, err, read); |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 1789 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
| 1790 | } |
| 1791 | } |
| 1792 | EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready); |
| 1793 | |
| 1794 | static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt, |
| 1795 | unsigned int offset, unsigned int *off, |
| 1796 | struct scatterlist **sgp) |
| 1797 | { |
| 1798 | int i; |
| 1799 | struct scatterlist *sg; |
| 1800 | |
| 1801 | for_each_sg(sgl, sg, sgcnt, i) { |
| 1802 | if (offset < sg->length) { |
| 1803 | *off = offset; |
| 1804 | *sgp = sg; |
| 1805 | return 0; |
| 1806 | } |
| 1807 | offset -= sg->length; |
| 1808 | } |
| 1809 | return -EFAULT; |
| 1810 | } |
| 1811 | |
| 1812 | static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset, |
| 1813 | unsigned int dlen, skb_frag_t *frags, |
| 1814 | int frag_max) |
| 1815 | { |
| 1816 | unsigned int datalen = dlen; |
| 1817 | unsigned int sglen = sg->length - sgoffset; |
| 1818 | struct page *page = sg_page(sg); |
| 1819 | int i; |
| 1820 | |
| 1821 | i = 0; |
| 1822 | do { |
| 1823 | unsigned int copy; |
| 1824 | |
| 1825 | if (!sglen) { |
| 1826 | sg = sg_next(sg); |
| 1827 | if (!sg) { |
| 1828 | pr_warn("sg %d NULL, len %u/%u.\n", |
| 1829 | i, datalen, dlen); |
| 1830 | return -EINVAL; |
| 1831 | } |
| 1832 | sgoffset = 0; |
| 1833 | sglen = sg->length; |
| 1834 | page = sg_page(sg); |
| 1835 | |
| 1836 | } |
| 1837 | copy = min(datalen, sglen); |
| 1838 | if (i && page == frags[i - 1].page && |
| 1839 | sgoffset + sg->offset == |
| 1840 | frags[i - 1].page_offset + frags[i - 1].size) { |
| 1841 | frags[i - 1].size += copy; |
| 1842 | } else { |
| 1843 | if (i >= frag_max) { |
| 1844 | pr_warn("too many pages %u, dlen %u.\n", |
| 1845 | frag_max, dlen); |
| 1846 | return -EINVAL; |
| 1847 | } |
| 1848 | |
| 1849 | frags[i].page = page; |
| 1850 | frags[i].page_offset = sg->offset + sgoffset; |
| 1851 | frags[i].size = copy; |
| 1852 | i++; |
| 1853 | } |
| 1854 | datalen -= copy; |
| 1855 | sgoffset += copy; |
| 1856 | sglen -= copy; |
| 1857 | } while (datalen); |
| 1858 | |
| 1859 | return i; |
| 1860 | } |
| 1861 | |
| 1862 | int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode) |
| 1863 | { |
| 1864 | struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data; |
| 1865 | struct cxgbi_conn *cconn = tcp_conn->dd_data; |
| 1866 | struct cxgbi_device *cdev = cconn->chba->cdev; |
| 1867 | struct iscsi_conn *conn = task->conn; |
| 1868 | struct iscsi_tcp_task *tcp_task = task->dd_data; |
kxie@chelsio.com | e3d2ad8 | 2010-09-23 16:43:23 -0700 | [diff] [blame] | 1869 | struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task); |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 1870 | struct scsi_cmnd *sc = task->sc; |
| 1871 | int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX; |
| 1872 | |
| 1873 | tcp_task->dd_data = tdata; |
| 1874 | task->hdr = NULL; |
| 1875 | |
| 1876 | if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) && |
| 1877 | (opcode == ISCSI_OP_SCSI_DATA_OUT || |
| 1878 | (opcode == ISCSI_OP_SCSI_CMD && |
| 1879 | (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE)))) |
| 1880 | /* data could goes into skb head */ |
| 1881 | headroom += min_t(unsigned int, |
| 1882 | SKB_MAX_HEAD(cdev->skb_tx_rsvd), |
| 1883 | conn->max_xmit_dlength); |
| 1884 | |
| 1885 | tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC); |
| 1886 | if (!tdata->skb) { |
| 1887 | pr_warn("alloc skb %u+%u, opcode 0x%x failed.\n", |
| 1888 | cdev->skb_tx_rsvd, headroom, opcode); |
| 1889 | return -ENOMEM; |
| 1890 | } |
| 1891 | |
| 1892 | skb_reserve(tdata->skb, cdev->skb_tx_rsvd); |
| 1893 | task->hdr = (struct iscsi_hdr *)tdata->skb->data; |
| 1894 | task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */ |
| 1895 | |
| 1896 | /* data_out uses scsi_cmd's itt */ |
| 1897 | if (opcode != ISCSI_OP_SCSI_DATA_OUT) |
| 1898 | task_reserve_itt(task, &task->hdr->itt); |
| 1899 | |
| 1900 | log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX, |
| 1901 | "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n", |
| 1902 | task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom, |
| 1903 | conn->max_xmit_dlength, ntohl(task->hdr->itt)); |
| 1904 | |
| 1905 | return 0; |
| 1906 | } |
| 1907 | EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu); |
| 1908 | |
| 1909 | static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc) |
| 1910 | { |
| 1911 | u8 submode = 0; |
| 1912 | |
| 1913 | if (hcrc) |
| 1914 | submode |= 1; |
| 1915 | if (dcrc) |
| 1916 | submode |= 2; |
| 1917 | cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode; |
| 1918 | } |
| 1919 | |
| 1920 | int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset, |
| 1921 | unsigned int count) |
| 1922 | { |
| 1923 | struct iscsi_conn *conn = task->conn; |
kxie@chelsio.com | e3d2ad8 | 2010-09-23 16:43:23 -0700 | [diff] [blame] | 1924 | struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task); |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 1925 | struct sk_buff *skb = tdata->skb; |
| 1926 | unsigned int datalen = count; |
| 1927 | int i, padlen = iscsi_padding(count); |
| 1928 | struct page *pg; |
| 1929 | |
| 1930 | log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX, |
| 1931 | "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n", |
| 1932 | task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK, |
| 1933 | ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count); |
| 1934 | |
| 1935 | skb_put(skb, task->hdr_len); |
| 1936 | tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0); |
| 1937 | if (!count) |
| 1938 | return 0; |
| 1939 | |
| 1940 | if (task->sc) { |
| 1941 | struct scsi_data_buffer *sdb = scsi_out(task->sc); |
| 1942 | struct scatterlist *sg = NULL; |
| 1943 | int err; |
| 1944 | |
| 1945 | tdata->offset = offset; |
| 1946 | tdata->count = count; |
| 1947 | err = sgl_seek_offset( |
| 1948 | sdb->table.sgl, sdb->table.nents, |
| 1949 | tdata->offset, &tdata->sgoffset, &sg); |
| 1950 | if (err < 0) { |
| 1951 | pr_warn("tpdu, sgl %u, bad offset %u/%u.\n", |
| 1952 | sdb->table.nents, tdata->offset, sdb->length); |
| 1953 | return err; |
| 1954 | } |
| 1955 | err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count, |
| 1956 | tdata->frags, MAX_PDU_FRAGS); |
| 1957 | if (err < 0) { |
| 1958 | pr_warn("tpdu, sgl %u, bad offset %u + %u.\n", |
| 1959 | sdb->table.nents, tdata->offset, tdata->count); |
| 1960 | return err; |
| 1961 | } |
| 1962 | tdata->nr_frags = err; |
| 1963 | |
| 1964 | if (tdata->nr_frags > MAX_SKB_FRAGS || |
| 1965 | (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) { |
| 1966 | char *dst = skb->data + task->hdr_len; |
| 1967 | skb_frag_t *frag = tdata->frags; |
| 1968 | |
| 1969 | /* data fits in the skb's headroom */ |
| 1970 | for (i = 0; i < tdata->nr_frags; i++, frag++) { |
| 1971 | char *src = kmap_atomic(frag->page, |
| 1972 | KM_SOFTIRQ0); |
| 1973 | |
| 1974 | memcpy(dst, src+frag->page_offset, frag->size); |
| 1975 | dst += frag->size; |
| 1976 | kunmap_atomic(src, KM_SOFTIRQ0); |
| 1977 | } |
| 1978 | if (padlen) { |
| 1979 | memset(dst, 0, padlen); |
| 1980 | padlen = 0; |
| 1981 | } |
| 1982 | skb_put(skb, count + padlen); |
| 1983 | } else { |
| 1984 | /* data fit into frag_list */ |
| 1985 | for (i = 0; i < tdata->nr_frags; i++) |
| 1986 | get_page(tdata->frags[i].page); |
| 1987 | |
| 1988 | memcpy(skb_shinfo(skb)->frags, tdata->frags, |
| 1989 | sizeof(skb_frag_t) * tdata->nr_frags); |
| 1990 | skb_shinfo(skb)->nr_frags = tdata->nr_frags; |
| 1991 | skb->len += count; |
| 1992 | skb->data_len += count; |
| 1993 | skb->truesize += count; |
| 1994 | } |
| 1995 | |
| 1996 | } else { |
| 1997 | pg = virt_to_page(task->data); |
| 1998 | |
| 1999 | get_page(pg); |
| 2000 | skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data), |
| 2001 | count); |
| 2002 | skb->len += count; |
| 2003 | skb->data_len += count; |
| 2004 | skb->truesize += count; |
| 2005 | } |
| 2006 | |
| 2007 | if (padlen) { |
| 2008 | i = skb_shinfo(skb)->nr_frags; |
| 2009 | skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, |
| 2010 | virt_to_page(padding), offset_in_page(padding), |
| 2011 | padlen); |
| 2012 | |
| 2013 | skb->data_len += padlen; |
| 2014 | skb->truesize += padlen; |
| 2015 | skb->len += padlen; |
| 2016 | } |
| 2017 | |
| 2018 | return 0; |
| 2019 | } |
| 2020 | EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu); |
| 2021 | |
| 2022 | int cxgbi_conn_xmit_pdu(struct iscsi_task *task) |
| 2023 | { |
| 2024 | struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data; |
| 2025 | struct cxgbi_conn *cconn = tcp_conn->dd_data; |
kxie@chelsio.com | e3d2ad8 | 2010-09-23 16:43:23 -0700 | [diff] [blame] | 2026 | struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task); |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 2027 | struct sk_buff *skb = tdata->skb; |
| 2028 | unsigned int datalen; |
| 2029 | int err; |
| 2030 | |
| 2031 | if (!skb) { |
| 2032 | log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX, |
| 2033 | "task 0x%p, skb NULL.\n", task); |
| 2034 | return 0; |
| 2035 | } |
| 2036 | |
| 2037 | datalen = skb->data_len; |
| 2038 | tdata->skb = NULL; |
| 2039 | err = cxgbi_sock_send_pdus(cconn->cep->csk, skb); |
| 2040 | if (err > 0) { |
| 2041 | int pdulen = err; |
| 2042 | |
| 2043 | log_debug(1 << CXGBI_DBG_PDU_TX, |
| 2044 | "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n", |
| 2045 | task, task->sc, skb, skb->len, skb->data_len, err); |
| 2046 | |
| 2047 | if (task->conn->hdrdgst_en) |
| 2048 | pdulen += ISCSI_DIGEST_SIZE; |
| 2049 | |
| 2050 | if (datalen && task->conn->datadgst_en) |
| 2051 | pdulen += ISCSI_DIGEST_SIZE; |
| 2052 | |
| 2053 | task->conn->txdata_octets += pdulen; |
| 2054 | return 0; |
| 2055 | } |
| 2056 | |
| 2057 | if (err == -EAGAIN || err == -ENOBUFS) { |
| 2058 | log_debug(1 << CXGBI_DBG_PDU_TX, |
| 2059 | "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n", |
| 2060 | task, skb, skb->len, skb->data_len, err); |
| 2061 | /* reset skb to send when we are called again */ |
| 2062 | tdata->skb = skb; |
| 2063 | return err; |
| 2064 | } |
| 2065 | |
| 2066 | kfree_skb(skb); |
| 2067 | log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX, |
| 2068 | "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n", |
| 2069 | task->itt, skb, skb->len, skb->data_len, err); |
| 2070 | iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err); |
| 2071 | iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED); |
| 2072 | return err; |
| 2073 | } |
| 2074 | EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu); |
| 2075 | |
| 2076 | void cxgbi_cleanup_task(struct iscsi_task *task) |
| 2077 | { |
kxie@chelsio.com | e3d2ad8 | 2010-09-23 16:43:23 -0700 | [diff] [blame] | 2078 | struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task); |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 2079 | |
| 2080 | log_debug(1 << CXGBI_DBG_ISCSI, |
| 2081 | "task 0x%p, skb 0x%p, itt 0x%x.\n", |
| 2082 | task, tdata->skb, task->hdr_itt); |
| 2083 | |
| 2084 | /* never reached the xmit task callout */ |
| 2085 | if (tdata->skb) |
| 2086 | __kfree_skb(tdata->skb); |
| 2087 | memset(tdata, 0, sizeof(*tdata)); |
| 2088 | |
| 2089 | task_release_itt(task, task->hdr_itt); |
| 2090 | iscsi_tcp_cleanup_task(task); |
| 2091 | } |
| 2092 | EXPORT_SYMBOL_GPL(cxgbi_cleanup_task); |
| 2093 | |
| 2094 | void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn, |
| 2095 | struct iscsi_stats *stats) |
| 2096 | { |
| 2097 | struct iscsi_conn *conn = cls_conn->dd_data; |
| 2098 | |
| 2099 | stats->txdata_octets = conn->txdata_octets; |
| 2100 | stats->rxdata_octets = conn->rxdata_octets; |
| 2101 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; |
| 2102 | stats->dataout_pdus = conn->dataout_pdus_cnt; |
| 2103 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; |
| 2104 | stats->datain_pdus = conn->datain_pdus_cnt; |
| 2105 | stats->r2t_pdus = conn->r2t_pdus_cnt; |
| 2106 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; |
| 2107 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; |
| 2108 | stats->digest_err = 0; |
| 2109 | stats->timeout_err = 0; |
| 2110 | stats->custom_length = 1; |
| 2111 | strcpy(stats->custom[0].desc, "eh_abort_cnt"); |
| 2112 | stats->custom[0].value = conn->eh_abort_cnt; |
| 2113 | } |
| 2114 | EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats); |
| 2115 | |
| 2116 | static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn) |
| 2117 | { |
| 2118 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| 2119 | struct cxgbi_conn *cconn = tcp_conn->dd_data; |
| 2120 | struct cxgbi_device *cdev = cconn->chba->cdev; |
| 2121 | unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd); |
| 2122 | unsigned int max_def = 512 * MAX_SKB_FRAGS; |
| 2123 | unsigned int max = max(max_def, headroom); |
| 2124 | |
| 2125 | max = min(cconn->chba->cdev->tx_max_size, max); |
| 2126 | if (conn->max_xmit_dlength) |
| 2127 | conn->max_xmit_dlength = min(conn->max_xmit_dlength, max); |
| 2128 | else |
| 2129 | conn->max_xmit_dlength = max; |
| 2130 | cxgbi_align_pdu_size(conn->max_xmit_dlength); |
| 2131 | |
| 2132 | return 0; |
| 2133 | } |
| 2134 | |
| 2135 | static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn) |
| 2136 | { |
| 2137 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| 2138 | struct cxgbi_conn *cconn = tcp_conn->dd_data; |
| 2139 | unsigned int max = cconn->chba->cdev->rx_max_size; |
| 2140 | |
| 2141 | cxgbi_align_pdu_size(max); |
| 2142 | |
| 2143 | if (conn->max_recv_dlength) { |
| 2144 | if (conn->max_recv_dlength > max) { |
| 2145 | pr_err("MaxRecvDataSegmentLength %u > %u.\n", |
| 2146 | conn->max_recv_dlength, max); |
| 2147 | return -EINVAL; |
| 2148 | } |
| 2149 | conn->max_recv_dlength = min(conn->max_recv_dlength, max); |
| 2150 | cxgbi_align_pdu_size(conn->max_recv_dlength); |
| 2151 | } else |
| 2152 | conn->max_recv_dlength = max; |
| 2153 | |
| 2154 | return 0; |
| 2155 | } |
| 2156 | |
| 2157 | int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn, |
| 2158 | enum iscsi_param param, char *buf, int buflen) |
| 2159 | { |
| 2160 | struct iscsi_conn *conn = cls_conn->dd_data; |
| 2161 | struct iscsi_session *session = conn->session; |
| 2162 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| 2163 | struct cxgbi_conn *cconn = tcp_conn->dd_data; |
| 2164 | struct cxgbi_sock *csk = cconn->cep->csk; |
| 2165 | int value, err = 0; |
| 2166 | |
| 2167 | log_debug(1 << CXGBI_DBG_ISCSI, |
| 2168 | "cls_conn 0x%p, param %d, buf(%d) %s.\n", |
| 2169 | cls_conn, param, buflen, buf); |
| 2170 | |
| 2171 | switch (param) { |
| 2172 | case ISCSI_PARAM_HDRDGST_EN: |
| 2173 | err = iscsi_set_param(cls_conn, param, buf, buflen); |
| 2174 | if (!err && conn->hdrdgst_en) |
| 2175 | err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid, |
| 2176 | conn->hdrdgst_en, |
| 2177 | conn->datadgst_en, 0); |
| 2178 | break; |
| 2179 | case ISCSI_PARAM_DATADGST_EN: |
| 2180 | err = iscsi_set_param(cls_conn, param, buf, buflen); |
| 2181 | if (!err && conn->datadgst_en) |
| 2182 | err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid, |
| 2183 | conn->hdrdgst_en, |
| 2184 | conn->datadgst_en, 0); |
| 2185 | break; |
| 2186 | case ISCSI_PARAM_MAX_R2T: |
| 2187 | sscanf(buf, "%d", &value); |
| 2188 | if (value <= 0 || !is_power_of_2(value)) |
| 2189 | return -EINVAL; |
| 2190 | if (session->max_r2t == value) |
| 2191 | break; |
| 2192 | iscsi_tcp_r2tpool_free(session); |
| 2193 | err = iscsi_set_param(cls_conn, param, buf, buflen); |
| 2194 | if (!err && iscsi_tcp_r2tpool_alloc(session)) |
| 2195 | return -ENOMEM; |
| 2196 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
| 2197 | err = iscsi_set_param(cls_conn, param, buf, buflen); |
| 2198 | if (!err) |
| 2199 | err = cxgbi_conn_max_recv_dlength(conn); |
| 2200 | break; |
| 2201 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: |
| 2202 | err = iscsi_set_param(cls_conn, param, buf, buflen); |
| 2203 | if (!err) |
| 2204 | err = cxgbi_conn_max_xmit_dlength(conn); |
| 2205 | break; |
| 2206 | default: |
| 2207 | return iscsi_set_param(cls_conn, param, buf, buflen); |
| 2208 | } |
| 2209 | return err; |
| 2210 | } |
| 2211 | EXPORT_SYMBOL_GPL(cxgbi_set_conn_param); |
| 2212 | |
| 2213 | int cxgbi_get_conn_param(struct iscsi_cls_conn *cls_conn, |
| 2214 | enum iscsi_param param, char *buf) |
| 2215 | { |
| 2216 | struct iscsi_conn *iconn = cls_conn->dd_data; |
| 2217 | int len; |
| 2218 | |
| 2219 | log_debug(1 << CXGBI_DBG_ISCSI, |
| 2220 | "cls_conn 0x%p, param %d.\n", cls_conn, param); |
| 2221 | |
| 2222 | switch (param) { |
| 2223 | case ISCSI_PARAM_CONN_PORT: |
| 2224 | spin_lock_bh(&iconn->session->lock); |
| 2225 | len = sprintf(buf, "%hu\n", iconn->portal_port); |
| 2226 | spin_unlock_bh(&iconn->session->lock); |
| 2227 | break; |
| 2228 | case ISCSI_PARAM_CONN_ADDRESS: |
| 2229 | spin_lock_bh(&iconn->session->lock); |
| 2230 | len = sprintf(buf, "%s\n", iconn->portal_address); |
| 2231 | spin_unlock_bh(&iconn->session->lock); |
| 2232 | break; |
| 2233 | default: |
| 2234 | return iscsi_conn_get_param(cls_conn, param, buf); |
| 2235 | } |
| 2236 | return len; |
| 2237 | } |
| 2238 | EXPORT_SYMBOL_GPL(cxgbi_get_conn_param); |
| 2239 | |
| 2240 | struct iscsi_cls_conn * |
| 2241 | cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid) |
| 2242 | { |
| 2243 | struct iscsi_cls_conn *cls_conn; |
| 2244 | struct iscsi_conn *conn; |
| 2245 | struct iscsi_tcp_conn *tcp_conn; |
| 2246 | struct cxgbi_conn *cconn; |
| 2247 | |
| 2248 | cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid); |
| 2249 | if (!cls_conn) |
| 2250 | return NULL; |
| 2251 | |
| 2252 | conn = cls_conn->dd_data; |
| 2253 | tcp_conn = conn->dd_data; |
| 2254 | cconn = tcp_conn->dd_data; |
| 2255 | cconn->iconn = conn; |
| 2256 | |
| 2257 | log_debug(1 << CXGBI_DBG_ISCSI, |
| 2258 | "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n", |
| 2259 | cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn); |
| 2260 | |
| 2261 | return cls_conn; |
| 2262 | } |
| 2263 | EXPORT_SYMBOL_GPL(cxgbi_create_conn); |
| 2264 | |
| 2265 | int cxgbi_bind_conn(struct iscsi_cls_session *cls_session, |
| 2266 | struct iscsi_cls_conn *cls_conn, |
| 2267 | u64 transport_eph, int is_leading) |
| 2268 | { |
| 2269 | struct iscsi_conn *conn = cls_conn->dd_data; |
| 2270 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| 2271 | struct cxgbi_conn *cconn = tcp_conn->dd_data; |
| 2272 | struct iscsi_endpoint *ep; |
| 2273 | struct cxgbi_endpoint *cep; |
| 2274 | struct cxgbi_sock *csk; |
| 2275 | int err; |
| 2276 | |
| 2277 | ep = iscsi_lookup_endpoint(transport_eph); |
| 2278 | if (!ep) |
| 2279 | return -EINVAL; |
| 2280 | |
| 2281 | /* setup ddp pagesize */ |
| 2282 | cep = ep->dd_data; |
| 2283 | csk = cep->csk; |
| 2284 | err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0); |
| 2285 | if (err < 0) |
| 2286 | return err; |
| 2287 | |
| 2288 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
| 2289 | if (err) |
| 2290 | return -EINVAL; |
| 2291 | |
| 2292 | /* calculate the tag idx bits needed for this conn based on cmds_max */ |
| 2293 | cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1; |
| 2294 | |
kxie@chelsio.com | e3d2ad8 | 2010-09-23 16:43:23 -0700 | [diff] [blame] | 2295 | write_lock_bh(&csk->callback_lock); |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 2296 | csk->user_data = conn; |
| 2297 | cconn->chba = cep->chba; |
| 2298 | cconn->cep = cep; |
| 2299 | cep->cconn = cconn; |
kxie@chelsio.com | e3d2ad8 | 2010-09-23 16:43:23 -0700 | [diff] [blame] | 2300 | write_unlock_bh(&csk->callback_lock); |
kxie@chelsio.com | 9ba682f | 2010-08-16 20:55:53 -0700 | [diff] [blame] | 2301 | |
| 2302 | cxgbi_conn_max_xmit_dlength(conn); |
| 2303 | cxgbi_conn_max_recv_dlength(conn); |
| 2304 | |
| 2305 | spin_lock_bh(&conn->session->lock); |
| 2306 | sprintf(conn->portal_address, "%pI4", &csk->daddr.sin_addr.s_addr); |
| 2307 | conn->portal_port = ntohs(csk->daddr.sin_port); |
| 2308 | spin_unlock_bh(&conn->session->lock); |
| 2309 | |
| 2310 | log_debug(1 << CXGBI_DBG_ISCSI, |
| 2311 | "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n", |
| 2312 | cls_session, cls_conn, ep, cconn, csk); |
| 2313 | /* init recv engine */ |
| 2314 | iscsi_tcp_hdr_recv_prep(tcp_conn); |
| 2315 | |
| 2316 | return 0; |
| 2317 | } |
| 2318 | EXPORT_SYMBOL_GPL(cxgbi_bind_conn); |
| 2319 | |
| 2320 | struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep, |
| 2321 | u16 cmds_max, u16 qdepth, |
| 2322 | u32 initial_cmdsn) |
| 2323 | { |
| 2324 | struct cxgbi_endpoint *cep; |
| 2325 | struct cxgbi_hba *chba; |
| 2326 | struct Scsi_Host *shost; |
| 2327 | struct iscsi_cls_session *cls_session; |
| 2328 | struct iscsi_session *session; |
| 2329 | |
| 2330 | if (!ep) { |
| 2331 | pr_err("missing endpoint.\n"); |
| 2332 | return NULL; |
| 2333 | } |
| 2334 | |
| 2335 | cep = ep->dd_data; |
| 2336 | chba = cep->chba; |
| 2337 | shost = chba->shost; |
| 2338 | |
| 2339 | BUG_ON(chba != iscsi_host_priv(shost)); |
| 2340 | |
| 2341 | cls_session = iscsi_session_setup(chba->cdev->itp, shost, |
| 2342 | cmds_max, 0, |
| 2343 | sizeof(struct iscsi_tcp_task) + |
| 2344 | sizeof(struct cxgbi_task_data), |
| 2345 | initial_cmdsn, ISCSI_MAX_TARGET); |
| 2346 | if (!cls_session) |
| 2347 | return NULL; |
| 2348 | |
| 2349 | session = cls_session->dd_data; |
| 2350 | if (iscsi_tcp_r2tpool_alloc(session)) |
| 2351 | goto remove_session; |
| 2352 | |
| 2353 | log_debug(1 << CXGBI_DBG_ISCSI, |
| 2354 | "ep 0x%p, cls sess 0x%p.\n", ep, cls_session); |
| 2355 | return cls_session; |
| 2356 | |
| 2357 | remove_session: |
| 2358 | iscsi_session_teardown(cls_session); |
| 2359 | return NULL; |
| 2360 | } |
| 2361 | EXPORT_SYMBOL_GPL(cxgbi_create_session); |
| 2362 | |
| 2363 | void cxgbi_destroy_session(struct iscsi_cls_session *cls_session) |
| 2364 | { |
| 2365 | log_debug(1 << CXGBI_DBG_ISCSI, |
| 2366 | "cls sess 0x%p.\n", cls_session); |
| 2367 | |
| 2368 | iscsi_tcp_r2tpool_free(cls_session->dd_data); |
| 2369 | iscsi_session_teardown(cls_session); |
| 2370 | } |
| 2371 | EXPORT_SYMBOL_GPL(cxgbi_destroy_session); |
| 2372 | |
| 2373 | int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
| 2374 | char *buf, int buflen) |
| 2375 | { |
| 2376 | struct cxgbi_hba *chba = iscsi_host_priv(shost); |
| 2377 | |
| 2378 | if (!chba->ndev) { |
| 2379 | shost_printk(KERN_ERR, shost, "Could not get host param. " |
| 2380 | "netdev for host not set.\n"); |
| 2381 | return -ENODEV; |
| 2382 | } |
| 2383 | |
| 2384 | log_debug(1 << CXGBI_DBG_ISCSI, |
| 2385 | "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n", |
| 2386 | shost, chba, chba->ndev->name, param, buflen, buf); |
| 2387 | |
| 2388 | switch (param) { |
| 2389 | case ISCSI_HOST_PARAM_IPADDRESS: |
| 2390 | { |
| 2391 | __be32 addr = in_aton(buf); |
| 2392 | log_debug(1 << CXGBI_DBG_ISCSI, |
| 2393 | "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr); |
| 2394 | cxgbi_set_iscsi_ipv4(chba, addr); |
| 2395 | return 0; |
| 2396 | } |
| 2397 | case ISCSI_HOST_PARAM_HWADDRESS: |
| 2398 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
| 2399 | return 0; |
| 2400 | default: |
| 2401 | return iscsi_host_set_param(shost, param, buf, buflen); |
| 2402 | } |
| 2403 | } |
| 2404 | EXPORT_SYMBOL_GPL(cxgbi_set_host_param); |
| 2405 | |
| 2406 | int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
| 2407 | char *buf) |
| 2408 | { |
| 2409 | struct cxgbi_hba *chba = iscsi_host_priv(shost); |
| 2410 | int len = 0; |
| 2411 | |
| 2412 | if (!chba->ndev) { |
| 2413 | shost_printk(KERN_ERR, shost, "Could not get host param. " |
| 2414 | "netdev for host not set.\n"); |
| 2415 | return -ENODEV; |
| 2416 | } |
| 2417 | |
| 2418 | log_debug(1 << CXGBI_DBG_ISCSI, |
| 2419 | "shost 0x%p, hba 0x%p,%s, param %d.\n", |
| 2420 | shost, chba, chba->ndev->name, param); |
| 2421 | |
| 2422 | switch (param) { |
| 2423 | case ISCSI_HOST_PARAM_HWADDRESS: |
| 2424 | len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6); |
| 2425 | break; |
| 2426 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
| 2427 | len = sprintf(buf, "%s\n", chba->ndev->name); |
| 2428 | break; |
| 2429 | case ISCSI_HOST_PARAM_IPADDRESS: |
| 2430 | { |
| 2431 | __be32 addr; |
| 2432 | |
| 2433 | addr = cxgbi_get_iscsi_ipv4(chba); |
| 2434 | len = sprintf(buf, "%pI4", &addr); |
| 2435 | log_debug(1 << CXGBI_DBG_ISCSI, |
| 2436 | "hba %s, ipv4 %pI4.\n", chba->ndev->name, &addr); |
| 2437 | break; |
| 2438 | } |
| 2439 | default: |
| 2440 | return iscsi_host_get_param(shost, param, buf); |
| 2441 | } |
| 2442 | |
| 2443 | return len; |
| 2444 | } |
| 2445 | EXPORT_SYMBOL_GPL(cxgbi_get_host_param); |
| 2446 | |
| 2447 | struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost, |
| 2448 | struct sockaddr *dst_addr, |
| 2449 | int non_blocking) |
| 2450 | { |
| 2451 | struct iscsi_endpoint *ep; |
| 2452 | struct cxgbi_endpoint *cep; |
| 2453 | struct cxgbi_hba *hba = NULL; |
| 2454 | struct cxgbi_sock *csk; |
| 2455 | int err = -EINVAL; |
| 2456 | |
| 2457 | log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK, |
| 2458 | "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n", |
| 2459 | shost, non_blocking, dst_addr); |
| 2460 | |
| 2461 | if (shost) { |
| 2462 | hba = iscsi_host_priv(shost); |
| 2463 | if (!hba) { |
| 2464 | pr_info("shost 0x%p, priv NULL.\n", shost); |
| 2465 | goto err_out; |
| 2466 | } |
| 2467 | } |
| 2468 | |
| 2469 | csk = cxgbi_check_route(dst_addr); |
| 2470 | if (IS_ERR(csk)) |
| 2471 | return (struct iscsi_endpoint *)csk; |
| 2472 | cxgbi_sock_get(csk); |
| 2473 | |
| 2474 | if (!hba) |
| 2475 | hba = csk->cdev->hbas[csk->port_id]; |
| 2476 | else if (hba != csk->cdev->hbas[csk->port_id]) { |
| 2477 | pr_info("Could not connect through requested host %u" |
| 2478 | "hba 0x%p != 0x%p (%u).\n", |
| 2479 | shost->host_no, hba, |
| 2480 | csk->cdev->hbas[csk->port_id], csk->port_id); |
| 2481 | err = -ENOSPC; |
| 2482 | goto release_conn; |
| 2483 | } |
| 2484 | |
| 2485 | err = sock_get_port(csk); |
| 2486 | if (err) |
| 2487 | goto release_conn; |
| 2488 | |
| 2489 | cxgbi_sock_set_state(csk, CTP_CONNECTING); |
| 2490 | err = csk->cdev->csk_init_act_open(csk); |
| 2491 | if (err) |
| 2492 | goto release_conn; |
| 2493 | |
| 2494 | if (cxgbi_sock_is_closing(csk)) { |
| 2495 | err = -ENOSPC; |
| 2496 | pr_info("csk 0x%p is closing.\n", csk); |
| 2497 | goto release_conn; |
| 2498 | } |
| 2499 | |
| 2500 | ep = iscsi_create_endpoint(sizeof(*cep)); |
| 2501 | if (!ep) { |
| 2502 | err = -ENOMEM; |
| 2503 | pr_info("iscsi alloc ep, OOM.\n"); |
| 2504 | goto release_conn; |
| 2505 | } |
| 2506 | |
| 2507 | cep = ep->dd_data; |
| 2508 | cep->csk = csk; |
| 2509 | cep->chba = hba; |
| 2510 | |
| 2511 | log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK, |
| 2512 | "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n", |
| 2513 | ep, cep, csk, hba, hba->ndev->name); |
| 2514 | return ep; |
| 2515 | |
| 2516 | release_conn: |
| 2517 | cxgbi_sock_put(csk); |
| 2518 | cxgbi_sock_closed(csk); |
| 2519 | err_out: |
| 2520 | return ERR_PTR(err); |
| 2521 | } |
| 2522 | EXPORT_SYMBOL_GPL(cxgbi_ep_connect); |
| 2523 | |
| 2524 | int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) |
| 2525 | { |
| 2526 | struct cxgbi_endpoint *cep = ep->dd_data; |
| 2527 | struct cxgbi_sock *csk = cep->csk; |
| 2528 | |
| 2529 | if (!cxgbi_sock_is_established(csk)) |
| 2530 | return 0; |
| 2531 | return 1; |
| 2532 | } |
| 2533 | EXPORT_SYMBOL_GPL(cxgbi_ep_poll); |
| 2534 | |
| 2535 | void cxgbi_ep_disconnect(struct iscsi_endpoint *ep) |
| 2536 | { |
| 2537 | struct cxgbi_endpoint *cep = ep->dd_data; |
| 2538 | struct cxgbi_conn *cconn = cep->cconn; |
| 2539 | struct cxgbi_sock *csk = cep->csk; |
| 2540 | |
| 2541 | log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK, |
| 2542 | "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n", |
| 2543 | ep, cep, cconn, csk, csk->state, csk->flags); |
| 2544 | |
| 2545 | if (cconn && cconn->iconn) { |
| 2546 | iscsi_suspend_tx(cconn->iconn); |
| 2547 | write_lock_bh(&csk->callback_lock); |
| 2548 | cep->csk->user_data = NULL; |
| 2549 | cconn->cep = NULL; |
| 2550 | write_unlock_bh(&csk->callback_lock); |
| 2551 | } |
| 2552 | iscsi_destroy_endpoint(ep); |
| 2553 | |
| 2554 | if (likely(csk->state >= CTP_ESTABLISHED)) |
| 2555 | need_active_close(csk); |
| 2556 | else |
| 2557 | cxgbi_sock_closed(csk); |
| 2558 | |
| 2559 | cxgbi_sock_put(csk); |
| 2560 | } |
| 2561 | EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect); |
| 2562 | |
| 2563 | int cxgbi_iscsi_init(struct iscsi_transport *itp, |
| 2564 | struct scsi_transport_template **stt) |
| 2565 | { |
| 2566 | *stt = iscsi_register_transport(itp); |
| 2567 | if (*stt == NULL) { |
| 2568 | pr_err("unable to register %s transport 0x%p.\n", |
| 2569 | itp->name, itp); |
| 2570 | return -ENODEV; |
| 2571 | } |
| 2572 | log_debug(1 << CXGBI_DBG_ISCSI, |
| 2573 | "%s, registered iscsi transport 0x%p.\n", |
| 2574 | itp->name, stt); |
| 2575 | return 0; |
| 2576 | } |
| 2577 | EXPORT_SYMBOL_GPL(cxgbi_iscsi_init); |
| 2578 | |
| 2579 | void cxgbi_iscsi_cleanup(struct iscsi_transport *itp, |
| 2580 | struct scsi_transport_template **stt) |
| 2581 | { |
| 2582 | if (*stt) { |
| 2583 | log_debug(1 << CXGBI_DBG_ISCSI, |
| 2584 | "de-register transport 0x%p, %s, stt 0x%p.\n", |
| 2585 | itp, itp->name, *stt); |
| 2586 | *stt = NULL; |
| 2587 | iscsi_unregister_transport(itp); |
| 2588 | } |
| 2589 | } |
| 2590 | EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup); |
| 2591 | |
| 2592 | static int __init libcxgbi_init_module(void) |
| 2593 | { |
| 2594 | sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1; |
| 2595 | sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1; |
| 2596 | |
| 2597 | pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n", |
| 2598 | ISCSI_ITT_MASK, sw_tag_idx_bits, |
| 2599 | ISCSI_AGE_MASK, sw_tag_age_bits); |
| 2600 | |
| 2601 | ddp_setup_host_page_size(); |
| 2602 | return 0; |
| 2603 | } |
| 2604 | |
| 2605 | static void __exit libcxgbi_exit_module(void) |
| 2606 | { |
| 2607 | cxgbi_device_unregister_all(0xFF); |
| 2608 | return; |
| 2609 | } |
| 2610 | |
| 2611 | module_init(libcxgbi_init_module); |
| 2612 | module_exit(libcxgbi_exit_module); |