/* * Copyright (c) 2005 Cisco Systems. All rights reserved. * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU * General Public License (GPL) Version 2, available from the file * COPYING in the main directory of this source tree, or the * OpenIB.org BSD license below: * * Redistribution and use in source and binary forms, with or * without modification, are permitted provided that the following * conditions are met: * * - Redistributions of source code must retain the above * copyright notice, this list of conditions and the following * disclaimer. * * - Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials * provided with the distribution. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "ib_srp.h" #define DRV_NAME "ib_srp" #define PFX DRV_NAME ": " #define DRV_VERSION "0.2" #define DRV_RELDATE "November 1, 2005" MODULE_AUTHOR("Roland Dreier"); MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator " "v" DRV_VERSION " (" DRV_RELDATE ")"); MODULE_LICENSE("Dual BSD/GPL"); static int srp_sg_tablesize = SRP_DEF_SG_TABLESIZE; static int srp_max_iu_len; module_param(srp_sg_tablesize, int, 0444); MODULE_PARM_DESC(srp_sg_tablesize, "Max number of gather/scatter entries per I/O (default is 12, max 255)"); static int topspin_workarounds = 1; module_param(topspin_workarounds, int, 0444); MODULE_PARM_DESC(topspin_workarounds, "Enable workarounds for Topspin/Cisco SRP target bugs if != 0"); static int mellanox_workarounds = 1; module_param(mellanox_workarounds, int, 0444); MODULE_PARM_DESC(mellanox_workarounds, "Enable workarounds for Mellanox SRP target bugs if != 0"); static void srp_add_one(struct ib_device *device); static void srp_remove_one(struct ib_device *device); static void srp_recv_completion(struct ib_cq *cq, void *target_ptr); static void srp_send_completion(struct ib_cq *cq, void *target_ptr); static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event); static struct scsi_transport_template *ib_srp_transport_template; static struct ib_client srp_client = { .name = "srp", .add = srp_add_one, .remove = srp_remove_one }; static struct ib_sa_client srp_sa_client; static inline struct srp_target_port *host_to_target(struct Scsi_Host *host) { return (struct srp_target_port *) host->hostdata; } static const char *srp_target_info(struct Scsi_Host *host) { return host_to_target(host)->target_name; } static int srp_target_is_topspin(struct srp_target_port *target) { static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad }; static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d }; return topspin_workarounds && (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) || !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui)); } static int srp_target_is_mellanox(struct srp_target_port *target) { static const u8 mellanox_oui[3] = { 0x00, 0x02, 0xc9 }; return mellanox_workarounds && !memcmp(&target->ioc_guid, mellanox_oui, sizeof mellanox_oui); } static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size, gfp_t gfp_mask, enum dma_data_direction direction) { struct srp_iu *iu; iu = kmalloc(sizeof *iu, gfp_mask); if (!iu) goto out; iu->buf = kzalloc(size, gfp_mask); if (!iu->buf) goto out_free_iu; iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size, direction); if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma)) goto out_free_buf; iu->size = size; iu->direction = direction; return iu; out_free_buf: kfree(iu->buf); out_free_iu: kfree(iu); out: return NULL; } static void srp_free_iu(struct srp_host *host, struct srp_iu *iu) { if (!iu) return; ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size, iu->direction); kfree(iu->buf); kfree(iu); } static void srp_qp_event(struct ib_event *event, void *context) { printk(KERN_ERR PFX "QP event %d\n", event->event); } static int srp_init_qp(struct srp_target_port *target, struct ib_qp *qp) { struct ib_qp_attr *attr; int ret; attr = kmalloc(sizeof *attr, GFP_KERNEL); if (!attr) return -ENOMEM; ret = ib_find_pkey(target->srp_host->srp_dev->dev, target->srp_host->port, be16_to_cpu(target->path.pkey), &attr->pkey_index); if (ret) goto out; attr->qp_state = IB_QPS_INIT; attr->qp_access_flags = (IB_ACCESS_REMOTE_READ | IB_ACCESS_REMOTE_WRITE); attr->port_num = target->srp_host->port; ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_ACCESS_FLAGS | IB_QP_PORT); out: kfree(attr); return ret; } static int srp_new_cm_id(struct srp_target_port *target) { struct ib_cm_id *new_cm_id; new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev, srp_cm_handler, target); if (IS_ERR(new_cm_id)) return PTR_ERR(new_cm_id); if (target->cm_id) ib_destroy_cm_id(target->cm_id); target->cm_id = new_cm_id; return 0; } static int srp_create_target_ib(struct srp_target_port *target) { struct ib_qp_init_attr *init_attr; int ret; init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL); if (!init_attr) return -ENOMEM; target->recv_cq = ib_create_cq(target->srp_host->srp_dev->dev, srp_recv_completion, NULL, target, SRP_RQ_SIZE, 0); if (IS_ERR(target->recv_cq)) { ret = PTR_ERR(target->recv_cq); goto err; } target->send_cq = ib_create_cq(target->srp_host->srp_dev->dev, srp_send_completion, NULL, target, SRP_SQ_SIZE, 0); if (IS_ERR(target->send_cq)) { ret = PTR_ERR(target->send_cq); goto err_recv_cq; } ib_req_notify_cq(target->recv_cq, IB_CQ_NEXT_COMP); init_attr->event_handler = srp_qp_event; init_attr->cap.max_send_wr = SRP_SQ_SIZE; init_attr->cap.max_recv_wr = SRP_RQ_SIZE; init_attr->cap.max_recv_sge = 1; init_attr->cap.max_send_sge = 1; init_attr->sq_sig_type = IB_SIGNAL_ALL_WR; init_attr->qp_type = IB_QPT_RC; init_attr->send_cq = target->send_cq; init_attr->recv_cq = target->recv_cq; target->qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr); if (IS_ERR(target->qp)) { ret = PTR_ERR(target->qp); goto err_send_cq; } ret = srp_init_qp(target, target->qp); if (ret) goto err_qp; kfree(init_attr); return 0; err_qp: ib_destroy_qp(target->qp); err_send_cq: ib_destroy_cq(target->send_cq); err_recv_cq: ib_destroy_cq(target->recv_cq); err: kfree(init_attr); return ret; } static void srp_free_target_ib(struct srp_target_port *target) { int i; ib_destroy_qp(target->qp); ib_destroy_cq(target->send_cq); ib_destroy_cq(target->recv_cq); for (i = 0; i < SRP_RQ_SIZE; ++i) srp_free_iu(target->srp_host, target->rx_ring[i]); for (i = 0; i < SRP_SQ_SIZE; ++i) srp_free_iu(target->srp_host, target->tx_ring[i]); } static void srp_path_rec_completion(int status, struct ib_sa_path_rec *pathrec, void *target_ptr) { struct srp_target_port *target = target_ptr; target->status = status; if (status) shost_printk(KERN_ERR, target->scsi_host, PFX "Got failed path rec status %d\n", status); else target->path = *pathrec; complete(&target->done); } static int srp_lookup_path(struct srp_target_port *target) { target->path.numb_path = 1; init_completion(&target->done); target->path_query_id = ib_sa_path_rec_get(&srp_sa_client, target->srp_host->srp_dev->dev, target->srp_host->port, &target->path, IB_SA_PATH_REC_SERVICE_ID | IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID | IB_SA_PATH_REC_NUMB_PATH | IB_SA_PATH_REC_PKEY, SRP_PATH_REC_TIMEOUT_MS, GFP_KERNEL, srp_path_rec_completion, target, &target->path_query); if (target->path_query_id < 0) return target->path_query_id; wait_for_completion(&target->done); if (target->status < 0) shost_printk(KERN_WARNING, target->scsi_host, PFX "Path record query failed\n"); return target->status; } static int srp_send_req(struct srp_target_port *target) { struct { struct ib_cm_req_param param; struct srp_login_req priv; } *req = NULL; int status; req = kzalloc(sizeof *req, GFP_KERNEL); if (!req) return -ENOMEM; req->param.primary_path = &target->path; req->param.alternate_path = NULL; req->param.service_id = target->service_id; req->param.qp_num = target->qp->qp_num; req->param.qp_type = target->qp->qp_type; req->param.private_data = &req->priv; req->param.private_data_len = sizeof req->priv; req->param.flow_control = 1; get_random_bytes(&req->param.starting_psn, 4); req->param.starting_psn &= 0xffffff; /* * Pick some arbitrary defaults here; we could make these * module parameters if anyone cared about setting them. */ req->param.responder_resources = 4; req->param.remote_cm_response_timeout = 20; req->param.local_cm_response_timeout = 20; req->param.retry_count = 7; req->param.rnr_retry_count = 7; req->param.max_cm_retries = 15; req->priv.opcode = SRP_LOGIN_REQ; req->priv.tag = 0; req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len); req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT); /* * In the published SRP specification (draft rev. 16a), the * port identifier format is 8 bytes of ID extension followed * by 8 bytes of GUID. Older drafts put the two halves in the * opposite order, so that the GUID comes first. * * Targets conforming to these obsolete drafts can be * recognized by the I/O Class they report. */ if (target->io_class == SRP_REV10_IB_IO_CLASS) { memcpy(req->priv.initiator_port_id, &target->path.sgid.global.interface_id, 8); memcpy(req->priv.initiator_port_id + 8, &target->initiator_ext, 8); memcpy(req->priv.target_port_id, &target->ioc_guid, 8); memcpy(req->priv.target_port_id + 8, &target->id_ext, 8); } else { memcpy(req->priv.initiator_port_id, &target->initiator_ext, 8); memcpy(req->priv.initiator_port_id + 8, &target->path.sgid.global.interface_id, 8); memcpy(req->priv.target_port_id, &target->id_ext, 8); memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8); } /* * Topspin/Cisco SRP targets will reject our login unless we * zero out the first 8 bytes of our initiator port ID and set * the second 8 bytes to the local node GUID. */ if (srp_target_is_topspin(target)) { shost_printk(KERN_DEBUG, target->scsi_host, PFX "Topspin/Cisco initiator port ID workaround " "activated for target GUID %016llx\n", (unsigned long long) be64_to_cpu(target->ioc_guid)); memset(req->priv.initiator_port_id, 0, 8); memcpy(req->priv.initiator_port_id + 8, &target->srp_host->srp_dev->dev->node_guid, 8); } status = ib_send_cm_req(target->cm_id, &req->param); kfree(req); return status; } static void srp_disconnect_target(struct srp_target_port *target) { /* XXX should send SRP_I_LOGOUT request */ init_completion(&target->done); if (ib_send_cm_dreq(target->cm_id, NULL, 0)) { shost_printk(KERN_DEBUG, target->scsi_host, PFX "Sending CM DREQ failed\n"); return; } wait_for_completion(&target->done); } static bool srp_change_state(struct srp_target_port *target, enum srp_target_state old, enum srp_target_state new) { bool changed = false; spin_lock_irq(&target->lock); if (target->state == old) { target->state = new; changed = true; } spin_unlock_irq(&target->lock); return changed; } static void srp_remove_work(struct work_struct *work) { struct srp_target_port *target = container_of(work, struct srp_target_port, work); if (!srp_change_state(target, SRP_TARGET_DEAD, SRP_TARGET_REMOVED)) return; spin_lock(&target->srp_host->target_lock); list_del(&target->list); spin_unlock(&target->srp_host->target_lock); srp_remove_host(target->scsi_host); scsi_remove_host(target->scsi_host); ib_destroy_cm_id(target->cm_id); srp_free_target_ib(target); scsi_host_put(target->scsi_host); } static int srp_connect_target(struct srp_target_port *target) { int retries = 3; int ret; ret = srp_lookup_path(target); if (ret) return ret; while (1) { init_completion(&target->done); ret = srp_send_req(target); if (ret) return ret; wait_for_completion(&target->done); /* * The CM event handling code will set status to * SRP_PORT_REDIRECT if we get a port redirect REJ * back, or SRP_DLID_REDIRECT if we get a lid/qp * redirect REJ back. */ switch (target->status) { case 0: return 0; case SRP_PORT_REDIRECT: ret = srp_lookup_path(target); if (ret) return ret; break; case SRP_DLID_REDIRECT: break; case SRP_STALE_CONN: /* Our current CM id was stale, and is now in timewait. * Try to reconnect with a new one. */ if (!retries-- || srp_new_cm_id(target)) { shost_printk(KERN_ERR, target->scsi_host, PFX "giving up on stale connection\n"); target->status = -ECONNRESET; return target->status; } shost_printk(KERN_ERR, target->scsi_host, PFX "retrying stale connection\n"); break; default: return target->status; } } } static void srp_unmap_data(struct scsi_cmnd *scmnd, struct srp_target_port *target, struct srp_request *req) { if (!scsi_sglist(scmnd) || (scmnd->sc_data_direction != DMA_TO_DEVICE && scmnd->sc_data_direction != DMA_FROM_DEVICE)) return; if (req->fmr) { ib_fmr_pool_unmap(req->fmr); req->fmr = NULL; } ib_dma_unmap_sg(target->srp_host->srp_dev->dev, scsi_sglist(scmnd), scsi_sg_count(scmnd), scmnd->sc_data_direction); } static void srp_remove_req(struct srp_target_port *target, struct srp_request *req, s32 req_lim_delta) { unsigned long flags; srp_unmap_data(req->scmnd, target, req); spin_lock_irqsave(&target->lock, flags); target->req_lim += req_lim_delta; req->scmnd = NULL; list_add_tail(&req->list, &target->free_reqs); spin_unlock_irqrestore(&target->lock, flags); } static void srp_reset_req(struct srp_target_port *target, struct srp_request *req) { req->scmnd->result = DID_RESET << 16; req->scmnd->scsi_done(req->scmnd); srp_remove_req(target, req, 0); } static int srp_reconnect_target(struct srp_target_port *target) { struct ib_qp_attr qp_attr; struct ib_wc wc; int i, ret; if (!srp_change_state(target, SRP_TARGET_LIVE, SRP_TARGET_CONNECTING)) return -EAGAIN; srp_disconnect_target(target); /* * Now get a new local CM ID so that we avoid confusing the * target in case things are really fouled up. */ ret = srp_new_cm_id(target); if (ret) goto err; qp_attr.qp_state = IB_QPS_RESET; ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE); if (ret) goto err; ret = srp_init_qp(target, target->qp); if (ret) goto err; while (ib_poll_cq(target->recv_cq, 1, &wc) > 0) ; /* nothing */ while (ib_poll_cq(target->send_cq, 1, &wc) > 0) ; /* nothing */ for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) { struct srp_request *req = &target->req_ring[i]; if (req->scmnd) srp_reset_req(target, req); } INIT_LIST_HEAD(&target->free_tx); for (i = 0; i < SRP_SQ_SIZE; ++i) list_add(&target->tx_ring[i]->list, &target->free_tx); target->qp_in_error = 0; ret = srp_connect_target(target); if (ret) goto err; if (!srp_change_state(target, SRP_TARGET_CONNECTING, SRP_TARGET_LIVE)) ret = -EAGAIN; return ret; err: shost_printk(KERN_ERR, target->scsi_host, PFX "reconnect failed (%d), removing target port.\n", ret); /* * We couldn't reconnect, so kill our target port off. * However, we have to defer the real removal because we * are in the context of the SCSI error handler now, which * will deadlock if we call scsi_remove_host(). * * Schedule our work inside the lock to avoid a race with * the flush_scheduled_work() in srp_remove_one(). */ spin_lock_irq(&target->lock); if (target->state == SRP_TARGET_CONNECTING) { target->state = SRP_TARGET_DEAD; INIT_WORK(&target->work, srp_remove_work); schedule_work(&target->work); } spin_unlock_irq(&target->lock); return ret; } static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat, int sg_cnt, struct srp_request *req, struct srp_direct_buf *buf) { u64 io_addr = 0; u64 *dma_pages; u32 len; int page_cnt; int i, j; int ret; struct srp_device *dev = target->srp_host->srp_dev; struct ib_device *ibdev = dev->dev; struct scatterlist *sg; if (!dev->fmr_pool) return -ENODEV; if (srp_target_is_mellanox(target) && (ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask)) return -EINVAL; len = page_cnt = 0; scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) { unsigned int dma_len = ib_sg_dma_len(ibdev, sg); if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) { if (i > 0) return -EINVAL; else ++page_cnt; } if ((ib_sg_dma_address(ibdev, sg) + dma_len) & ~dev->fmr_page_mask) { if (i < sg_cnt - 1) return -EINVAL; else ++page_cnt; } len += dma_len; } page_cnt += len >> dev->fmr_page_shift; if (page_cnt > SRP_FMR_SIZE) return -ENOMEM; dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC); if (!dma_pages) return -ENOMEM; page_cnt = 0; scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) { unsigned int dma_len = ib_sg_dma_len(ibdev, sg); for (j = 0; j < dma_len; j += dev->fmr_page_size) dma_pages[page_cnt++] = (ib_sg_dma_address(ibdev, sg) & dev->fmr_page_mask) + j; } req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool, dma_pages, page_cnt, io_addr); if (IS_ERR(req->fmr)) { ret = PTR_ERR(req->fmr); req->fmr = NULL; goto out; } buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask); buf->key = cpu_to_be32(req->fmr->fmr->rkey); buf->len = cpu_to_be32(len); ret = 0; out: kfree(dma_pages); return ret; } static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target, struct srp_request *req) { struct scatterlist *scat; struct srp_cmd *cmd = req->cmd->buf; int len, nents, count; u8 fmt = SRP_DATA_DESC_DIRECT; struct srp_device *dev; struct ib_device *ibdev; if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE) return sizeof (struct srp_cmd); if (scmnd->sc_data_direction != DMA_FROM_DEVICE && scmnd->sc_data_direction != DMA_TO_DEVICE) { shost_printk(KERN_WARNING, target->scsi_host, PFX "Unhandled data direction %d\n", scmnd->sc_data_direction); return -EINVAL; } nents = scsi_sg_count(scmnd); scat = scsi_sglist(scmnd); dev = target->srp_host->srp_dev; ibdev = dev->dev; count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction); fmt = SRP_DATA_DESC_DIRECT; len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf); if (count == 1) { /* * The midlayer only generated a single gather/scatter * entry, or DMA mapping coalesced everything to a * single entry. So a direct descriptor along with * the DMA MR suffices. */ struct srp_direct_buf *buf = (void *) cmd->add_data; buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat)); buf->key = cpu_to_be32(dev->mr->rkey); buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat)); } else if (srp_map_fmr(target, scat, count, req, (void *) cmd->add_data)) { /* * FMR mapping failed, and the scatterlist has more * than one entry. Generate an indirect memory * descriptor. */ struct srp_indirect_buf *buf = (void *) cmd->add_data; struct scatterlist *sg; u32 datalen = 0; int i; fmt = SRP_DATA_DESC_INDIRECT; len = sizeof (struct srp_cmd) + sizeof (struct srp_indirect_buf) + count * sizeof (struct srp_direct_buf); scsi_for_each_sg(scmnd, sg, count, i) { unsigned int dma_len = ib_sg_dma_len(ibdev, sg); buf->desc_list[i].va = cpu_to_be64(ib_sg_dma_address(ibdev, sg)); buf->desc_list[i].key = cpu_to_be32(dev->mr->rkey); buf->desc_list[i].len = cpu_to_be32(dma_len); datalen += dma_len; } if (scmnd->sc_data_direction == DMA_TO_DEVICE) cmd->data_out_desc_cnt = count; else cmd->data_in_desc_cnt = count; buf->table_desc.va = cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf); buf->table_desc.key = cpu_to_be32(target->srp_host->srp_dev->mr->rkey); buf->table_desc.len = cpu_to_be32(count * sizeof (struct srp_direct_buf)); buf->len = cpu_to_be32(datalen); } if (scmnd->sc_data_direction == DMA_TO_DEVICE) cmd->buf_fmt = fmt << 4; else cmd->buf_fmt = fmt; return len; } /* * Return an IU and possible credit to the free pool */ static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu, enum srp_iu_type iu_type) { unsigned long flags; spin_lock_irqsave(&target->lock, flags); list_add(&iu->list, &target->free_tx); if (iu_type != SRP_IU_RSP) ++target->req_lim; spin_unlock_irqrestore(&target->lock, flags); } /* * Must be called with target->lock held to protect req_lim and free_tx. * If IU is not sent, it must be returned using srp_put_tx_iu(). * * Note: * An upper limit for the number of allocated information units for each * request type is: * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues * more than Scsi_Host.can_queue requests. * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE. * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than * one unanswered SRP request to an initiator. */ static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target, enum srp_iu_type iu_type) { s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE; struct srp_iu *iu; srp_send_completion(target->send_cq, target); if (list_empty(&target->free_tx)) return NULL; /* Initiator responses to target requests do not consume credits */ if (iu_type != SRP_IU_RSP) { if (target->req_lim <= rsv) { ++target->zero_req_lim; return NULL; } --target->req_lim; } iu = list_first_entry(&target->free_tx, struct srp_iu, list); list_del(&iu->list); return iu; } static int srp_post_send(struct srp_target_port *target, struct srp_iu *iu, int len) { struct ib_sge list; struct ib_send_wr wr, *bad_wr; list.addr = iu->dma; list.length = len; list.lkey = target->srp_host->srp_dev->mr->lkey; wr.next = NULL; wr.wr_id = (uintptr_t) iu; wr.sg_list = &list; wr.num_sge = 1; wr.opcode = IB_WR_SEND; wr.send_flags = IB_SEND_SIGNALED; return ib_post_send(target->qp, &wr, &bad_wr); } static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu) { struct ib_recv_wr wr, *bad_wr; struct ib_sge list; list.addr = iu->dma; list.length = iu->size; list.lkey = target->srp_host->srp_dev->mr->lkey; wr.next = NULL; wr.wr_id = (uintptr_t) iu; wr.sg_list = &list; wr.num_sge = 1; return ib_post_recv(target->qp, &wr, &bad_wr); } static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp) { struct srp_request *req; struct scsi_cmnd *scmnd; unsigned long flags; if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) { spin_lock_irqsave(&target->lock, flags); target->req_lim += be32_to_cpu(rsp->req_lim_delta); spin_unlock_irqrestore(&target->lock, flags); target->tsk_mgmt_status = -1; if (be32_to_cpu(rsp->resp_data_len) >= 4) target->tsk_mgmt_status = rsp->data[3]; complete(&target->tsk_mgmt_done); } else { req = &target->req_ring[rsp->tag]; scmnd = req->scmnd; if (!scmnd) shost_printk(KERN_ERR, target->scsi_host, "Null scmnd for RSP w/tag %016llx\n", (unsigned long long) rsp->tag); scmnd->result = rsp->status; if (rsp->flags & SRP_RSP_FLAG_SNSVALID) { memcpy(scmnd->sense_buffer, rsp->data + be32_to_cpu(rsp->resp_data_len), min_t(int, be32_to_cpu(rsp->sense_data_len), SCSI_SENSE_BUFFERSIZE)); } if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER)) scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt)); else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER)) scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt)); srp_remove_req(target, req, be32_to_cpu(rsp->req_lim_delta)); scmnd->host_scribble = NULL; scmnd->scsi_done(scmnd); } } static int srp_response_common(struct srp_target_port *target, s32 req_delta, void *rsp, int len) { struct ib_device *dev = target->srp_host->srp_dev->dev; unsigned long flags; struct srp_iu *iu; int err; spin_lock_irqsave(&target->lock, flags); target->req_lim += req_delta; iu = __srp_get_tx_iu(target, SRP_IU_RSP); spin_unlock_irqrestore(&target->lock, flags); if (!iu) { shost_printk(KERN_ERR, target->scsi_host, PFX "no IU available to send response\n"); return 1; } ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE); memcpy(iu->buf, rsp, len); ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE); err = srp_post_send(target, iu, len); if (err) { shost_printk(KERN_ERR, target->scsi_host, PFX "unable to post response: %d\n", err); srp_put_tx_iu(target, iu, SRP_IU_RSP); } return err; } static void srp_process_cred_req(struct srp_target_port *target, struct srp_cred_req *req) { struct srp_cred_rsp rsp = { .opcode = SRP_CRED_RSP, .tag = req->tag, }; s32 delta = be32_to_cpu(req->req_lim_delta); if (srp_response_common(target, delta, &rsp, sizeof rsp)) shost_printk(KERN_ERR, target->scsi_host, PFX "problems processing SRP_CRED_REQ\n"); } static void srp_process_aer_req(struct srp_target_port *target, struct srp_aer_req *req) { struct srp_aer_rsp rsp = { .opcode = SRP_AER_RSP, .tag = req->tag, }; s32 delta = be32_to_cpu(req->req_lim_delta); shost_printk(KERN_ERR, target->scsi_host, PFX "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun)); if (srp_response_common(target, delta, &rsp, sizeof rsp)) shost_printk(KERN_ERR, target->scsi_host, PFX "problems processing SRP_AER_REQ\n"); } static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc) { struct ib_device *dev = target->srp_host->srp_dev->dev; struct srp_iu *iu = (struct srp_iu *) wc->wr_id; int res; u8 opcode; ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len, DMA_FROM_DEVICE); opcode = *(u8 *) iu->buf; if (0) { shost_printk(KERN_ERR, target->scsi_host, PFX "recv completion, opcode 0x%02x\n", opcode); print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1, iu->buf, wc->byte_len, true); } switch (opcode) { case SRP_RSP: srp_process_rsp(target, iu->buf); break; case SRP_CRED_REQ: srp_process_cred_req(target, iu->buf); break; case SRP_AER_REQ: srp_process_aer_req(target, iu->buf); break; case SRP_T_LOGOUT: /* XXX Handle target logout */ shost_printk(KERN_WARNING, target->scsi_host, PFX "Got target logout request\n"); break; default: shost_printk(KERN_WARNING, target->scsi_host, PFX "Unhandled SRP opcode 0x%02x\n", opcode); break; } ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len, DMA_FROM_DEVICE); res = srp_post_recv(target, iu); if (res != 0) shost_printk(KERN_ERR, target->scsi_host, PFX "Recv failed with error code %d\n", res); } static void srp_recv_completion(struct ib_cq *cq, void *target_ptr) { struct srp_target_port *target = target_ptr; struct ib_wc wc; ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); while (ib_poll_cq(cq, 1, &wc) > 0) { if (wc.status) { shost_printk(KERN_ERR, target->scsi_host, PFX "failed receive status %d\n", wc.status); target->qp_in_error = 1; break; } srp_handle_recv(target, &wc); } } static void srp_send_completion(struct ib_cq *cq, void *target_ptr) { struct srp_target_port *target = target_ptr; struct ib_wc wc; struct srp_iu *iu; while (ib_poll_cq(cq, 1, &wc) > 0) { if (wc.status) { shost_printk(KERN_ERR, target->scsi_host, PFX "failed send status %d\n", wc.status); target->qp_in_error = 1; break; } iu = (struct srp_iu *) wc.wr_id; list_add(&iu->list, &target->free_tx); } } static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd) { struct srp_target_port *target = host_to_target(shost); struct srp_request *req; struct srp_iu *iu; struct srp_cmd *cmd; struct ib_device *dev; unsigned long flags; int len; if (target->state == SRP_TARGET_CONNECTING) goto err; if (target->state == SRP_TARGET_DEAD || target->state == SRP_TARGET_REMOVED) { scmnd->result = DID_BAD_TARGET << 16; scmnd->scsi_done(scmnd); return 0; } spin_lock_irqsave(&target->lock, flags); iu = __srp_get_tx_iu(target, SRP_IU_CMD); if (iu) { req = list_first_entry(&target->free_reqs, struct srp_request, list); list_del(&req->list); } spin_unlock_irqrestore(&target->lock, flags); if (!iu) goto err; dev = target->srp_host->srp_dev->dev; ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len, DMA_TO_DEVICE); scmnd->result = 0; scmnd->host_scribble = (void *) req; cmd = iu->buf; memset(cmd, 0, sizeof *cmd); cmd->opcode = SRP_CMD; cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48); cmd->tag = req->index; memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len); req->scmnd = scmnd; req->cmd = iu; len = srp_map_data(scmnd, target, req); if (len < 0) { shost_printk(KERN_ERR, target->scsi_host, PFX "Failed to map data\n"); goto err_iu; } ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len, DMA_TO_DEVICE); if (srp_post_send(target, iu, len)) { shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n"); goto err_unmap; } return 0; err_unmap: srp_unmap_data(scmnd, target, req); err_iu: srp_put_tx_iu(target, iu, SRP_IU_CMD); spin_lock_irqsave(&target->lock, flags); list_add(&req->list, &target->free_reqs); spin_unlock_irqrestore(&target->lock, flags); err: return SCSI_MLQUEUE_HOST_BUSY; } static int srp_alloc_iu_bufs(struct srp_target_port *target) { int i; for (i = 0; i < SRP_RQ_SIZE; ++i) { target->rx_ring[i] = srp_alloc_iu(target->srp_host, target->max_ti_iu_len, GFP_KERNEL, DMA_FROM_DEVICE); if (!target->rx_ring[i]) goto err; } for (i = 0; i < SRP_SQ_SIZE; ++i) { target->tx_ring[i] = srp_alloc_iu(target->srp_host, srp_max_iu_len, GFP_KERNEL, DMA_TO_DEVICE); if (!target->tx_ring[i]) goto err; list_add(&target->tx_ring[i]->list, &target->free_tx); } return 0; err: for (i = 0; i < SRP_RQ_SIZE; ++i) { srp_free_iu(target->srp_host, target->rx_ring[i]); target->rx_ring[i] = NULL; } for (i = 0; i < SRP_SQ_SIZE; ++i) { srp_free_iu(target->srp_host, target->tx_ring[i]); target->tx_ring[i] = NULL; } return -ENOMEM; } static void srp_cm_rej_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event, struct srp_target_port *target) { struct Scsi_Host *shost = target->scsi_host; struct ib_class_port_info *cpi; int opcode; switch (event->param.rej_rcvd.reason) { case IB_CM_REJ_PORT_CM_REDIRECT: cpi = event->param.rej_rcvd.ari; target->path.dlid = cpi->redirect_lid; target->path.pkey = cpi->redirect_pkey; cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff; memcpy(target->path.dgid.raw, cpi->redirect_gid, 16); target->status = target->path.dlid ? SRP_DLID_REDIRECT : SRP_PORT_REDIRECT; break; case IB_CM_REJ_PORT_REDIRECT: if (srp_target_is_topspin(target)) { /* * Topspin/Cisco SRP gateways incorrectly send * reject reason code 25 when they mean 24 * (port redirect). */ memcpy(target->path.dgid.raw, event->param.rej_rcvd.ari, 16); shost_printk(KERN_DEBUG, shost, PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n", (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix), (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id)); target->status = SRP_PORT_REDIRECT; } else { shost_printk(KERN_WARNING, shost, " REJ reason: IB_CM_REJ_PORT_REDIRECT\n"); target->status = -ECONNRESET; } break; case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID: shost_printk(KERN_WARNING, shost, " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n"); target->status = -ECONNRESET; break; case IB_CM_REJ_CONSUMER_DEFINED: opcode = *(u8 *) event->private_data; if (opcode == SRP_LOGIN_REJ) { struct srp_login_rej *rej = event->private_data; u32 reason = be32_to_cpu(rej->reason); if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE) shost_printk(KERN_WARNING, shost, PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n"); else shost_printk(KERN_WARNING, shost, PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason); } else shost_printk(KERN_WARNING, shost, " REJ reason: IB_CM_REJ_CONSUMER_DEFINED," " opcode 0x%02x\n", opcode); target->status = -ECONNRESET; break; case IB_CM_REJ_STALE_CONN: shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n"); target->status = SRP_STALE_CONN; break; default: shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n", event->param.rej_rcvd.reason); target->status = -ECONNRESET; } } static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) { struct srp_target_port *target = cm_id->context; struct ib_qp_attr *qp_attr = NULL; int attr_mask = 0; int comp = 0; int opcode = 0; int i; switch (event->event) { case IB_CM_REQ_ERROR: shost_printk(KERN_DEBUG, target->scsi_host, PFX "Sending CM REQ failed\n"); comp = 1; target->status = -ECONNRESET; break; case IB_CM_REP_RECEIVED: comp = 1; opcode = *(u8 *) event->private_data; if (opcode == SRP_LOGIN_RSP) { struct srp_login_rsp *rsp = event->private_data; target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len); target->req_lim = be32_to_cpu(rsp->req_lim_delta); /* * Reserve credits for task management so we don't * bounce requests back to the SCSI mid-layer. */ target->scsi_host->can_queue = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE, target->scsi_host->can_queue); } else { shost_printk(KERN_WARNING, target->scsi_host, PFX "Unhandled RSP opcode %#x\n", opcode); target->status = -ECONNRESET; break; } if (!target->rx_ring[0]) { target->status = srp_alloc_iu_bufs(target); if (target->status) break; } qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL); if (!qp_attr) { target->status = -ENOMEM; break; } qp_attr->qp_state = IB_QPS_RTR; target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask); if (target->status) break; target->status = ib_modify_qp(target->qp, qp_attr, attr_mask); if (target->status) break; for (i = 0; i < SRP_RQ_SIZE; i++) { struct srp_iu *iu = target->rx_ring[i]; target->status = srp_post_recv(target, iu); if (target->status) break; } if (target->status) break; qp_attr->qp_state = IB_QPS_RTS; target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask); if (target->status) break; target->status = ib_modify_qp(target->qp, qp_attr, attr_mask); if (target->status) break; target->status = ib_send_cm_rtu(cm_id, NULL, 0); if (target->status) break; break; case IB_CM_REJ_RECEIVED: shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n"); comp = 1; srp_cm_rej_handler(cm_id, event, target); break; case IB_CM_DREQ_RECEIVED: shost_printk(KERN_WARNING, target->scsi_host, PFX "DREQ received - connection closed\n"); if (ib_send_cm_drep(cm_id, NULL, 0)) shost_printk(KERN_ERR, target->scsi_host, PFX "Sending CM DREP failed\n"); break; case IB_CM_TIMEWAIT_EXIT: shost_printk(KERN_ERR, target->scsi_host, PFX "connection closed\n"); comp = 1; target->status = 0; break; case IB_CM_MRA_RECEIVED: case IB_CM_DREQ_ERROR: case IB_CM_DREP_RECEIVED: break; default: shost_printk(KERN_WARNING, target->scsi_host, PFX "Unhandled CM event %d\n", event->event); break; } if (comp) complete(&target->done); kfree(qp_attr); return 0; } static int srp_send_tsk_mgmt(struct srp_target_port *target, u64 req_tag, unsigned int lun, u8 func) { struct ib_device *dev = target->srp_host->srp_dev->dev; struct srp_iu *iu; struct srp_tsk_mgmt *tsk_mgmt; if (target->state == SRP_TARGET_DEAD || target->state == SRP_TARGET_REMOVED) return -1; init_completion(&target->tsk_mgmt_done); spin_lock_irq(&target->lock); iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT); spin_unlock_irq(&target->lock); if (!iu) return -1; ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt, DMA_TO_DEVICE); tsk_mgmt = iu->buf; memset(tsk_mgmt, 0, sizeof *tsk_mgmt); tsk_mgmt->opcode = SRP_TSK_MGMT; tsk_mgmt->lun = cpu_to_be64((u64) lun << 48); tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT; tsk_mgmt->tsk_mgmt_func = func; tsk_mgmt->task_tag = req_tag; ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt, DMA_TO_DEVICE); if (srp_post_send(target, iu, sizeof *tsk_mgmt)) { srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT); return -1; } if (!wait_for_completion_timeout(&target->tsk_mgmt_done, msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS))) return -1; return 0; } static int srp_abort(struct scsi_cmnd *scmnd) { struct srp_target_port *target = host_to_target(scmnd->device->host); struct srp_request *req = (struct srp_request *) scmnd->host_scribble; int ret = SUCCESS; shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n"); if (!req || target->qp_in_error) return FAILED; if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun, SRP_TSK_ABORT_TASK)) return FAILED; if (req->scmnd) { if (!target->tsk_mgmt_status) { srp_remove_req(target, req, 0); scmnd->result = DID_ABORT << 16; } else ret = FAILED; } return ret; } static int srp_reset_device(struct scsi_cmnd *scmnd) { struct srp_target_port *target = host_to_target(scmnd->device->host); int i; shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n"); if (target->qp_in_error) return FAILED; if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun, SRP_TSK_LUN_RESET)) return FAILED; if (target->tsk_mgmt_status) return FAILED; for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) { struct srp_request *req = &target->req_ring[i]; if (req->scmnd && req->scmnd->device == scmnd->device) srp_reset_req(target, req); } return SUCCESS; } static int srp_reset_host(struct scsi_cmnd *scmnd) { struct srp_target_port *target = host_to_target(scmnd->device->host); int ret = FAILED; shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n"); if (!srp_reconnect_target(target)) ret = SUCCESS; return ret; } static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr, char *buf) { struct srp_target_port *target = host_to_target(class_to_shost(dev)); if (target->state == SRP_TARGET_DEAD || target->state == SRP_TARGET_REMOVED) return -ENODEV; return sprintf(buf, "0x%016llx\n", (unsigned long long) be64_to_cpu(target->id_ext)); } static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr, char *buf) { struct srp_target_port *target = host_to_target(class_to_shost(dev)); if (target->state == SRP_TARGET_DEAD || target->state == SRP_TARGET_REMOVED) return -ENODEV; return sprintf(buf, "0x%016llx\n", (unsigned long long) be64_to_cpu(target->ioc_guid)); } static ssize_t show_service_id(struct device *dev, struct device_attribute *attr, char *buf) { struct srp_target_port *target = host_to_target(class_to_shost(dev)); if (target->state == SRP_TARGET_DEAD || target->state == SRP_TARGET_REMOVED) return -ENODEV; return sprintf(buf, "0x%016llx\n", (unsigned long long) be64_to_cpu(target->service_id)); } static ssize_t show_pkey(struct device *dev, struct device_attribute *attr, char *buf) { struct srp_target_port *target = host_to_target(class_to_shost(dev)); if (target->state == SRP_TARGET_DEAD || target->state == SRP_TARGET_REMOVED) return -ENODEV; return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey)); } static ssize_t show_dgid(struct device *dev, struct device_attribute *attr, char *buf) { struct srp_target_port *target = host_to_target(class_to_shost(dev)); if (target->state == SRP_TARGET_DEAD || target->state == SRP_TARGET_REMOVED) return -ENODEV; return sprintf(buf, "%pI6\n", target->path.dgid.raw); } static ssize_t show_orig_dgid(struct device *dev, struct device_attribute *attr, char *buf) { struct srp_target_port *target = host_to_target(class_to_shost(dev)); if (target->state == SRP_TARGET_DEAD || target->state == SRP_TARGET_REMOVED) return -ENODEV; return sprintf(buf, "%pI6\n", target->orig_dgid); } static ssize_t show_req_lim(struct device *dev, struct device_attribute *attr, char *buf) { struct srp_target_port *target = host_to_target(class_to_shost(dev)); if (target->state == SRP_TARGET_DEAD || target->state == SRP_TARGET_REMOVED) return -ENODEV; return sprintf(buf, "%d\n", target->req_lim); } static ssize_t show_zero_req_lim(struct device *dev, struct device_attribute *attr, char *buf) { struct srp_target_port *target = host_to_target(class_to_shost(dev)); if (target->state == SRP_TARGET_DEAD || target->state == SRP_TARGET_REMOVED) return -ENODEV; return sprintf(buf, "%d\n", target->zero_req_lim); } static ssize_t show_local_ib_port(struct device *dev, struct device_attribute *attr, char *buf) { struct srp_target_port *target = host_to_target(class_to_shost(dev)); return sprintf(buf, "%d\n", target->srp_host->port); } static ssize_t show_local_ib_device(struct device *dev, struct device_attribute *attr, char *buf) { struct srp_target_port *target = host_to_target(class_to_shost(dev)); return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name); } static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL); static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL); static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL); static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL); static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL); static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL); static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL); static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL); static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL); static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL); static struct device_attribute *srp_host_attrs[] = { &dev_attr_id_ext, &dev_attr_ioc_guid, &dev_attr_service_id, &dev_attr_pkey, &dev_attr_dgid, &dev_attr_orig_dgid, &dev_attr_req_lim, &dev_attr_zero_req_lim, &dev_attr_local_ib_port, &dev_attr_local_ib_device, NULL }; static struct scsi_host_template srp_template = { .module = THIS_MODULE, .name = "InfiniBand SRP initiator", .proc_name = DRV_NAME, .info = srp_target_info, .queuecommand = srp_queuecommand, .eh_abort_handler = srp_abort, .eh_device_reset_handler = srp_reset_device, .eh_host_reset_handler = srp_reset_host, .can_queue = SRP_CMD_SQ_SIZE, .this_id = -1, .cmd_per_lun = SRP_CMD_SQ_SIZE, .use_clustering = ENABLE_CLUSTERING, .shost_attrs = srp_host_attrs }; static int srp_add_target(struct srp_host *host, struct srp_target_port *target) { struct srp_rport_identifiers ids; struct srp_rport *rport; sprintf(target->target_name, "SRP.T10:%016llX", (unsigned long long) be64_to_cpu(target->id_ext)); if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device)) return -ENODEV; memcpy(ids.port_id, &target->id_ext, 8); memcpy(ids.port_id + 8, &target->ioc_guid, 8); ids.roles = SRP_RPORT_ROLE_TARGET; rport = srp_rport_add(target->scsi_host, &ids); if (IS_ERR(rport)) { scsi_remove_host(target->scsi_host); return PTR_ERR(rport); } spin_lock(&host->target_lock); list_add_tail(&target->list, &host->target_list); spin_unlock(&host->target_lock); target->state = SRP_TARGET_LIVE; scsi_scan_target(&target->scsi_host->shost_gendev, 0, target->scsi_id, SCAN_WILD_CARD, 0); return 0; } static void srp_release_dev(struct device *dev) { struct srp_host *host = container_of(dev, struct srp_host, dev); complete(&host->released); } static struct class srp_class = { .name = "infiniband_srp", .dev_release = srp_release_dev }; /* * Target ports are added by writing * * id_ext=,ioc_guid=,dgid=, * pkey=,service_id= * * to the add_target sysfs attribute. */ enum { SRP_OPT_ERR = 0, SRP_OPT_ID_EXT = 1 << 0, SRP_OPT_IOC_GUID = 1 << 1, SRP_OPT_DGID = 1 << 2, SRP_OPT_PKEY = 1 << 3, SRP_OPT_SERVICE_ID = 1 << 4, SRP_OPT_MAX_SECT = 1 << 5, SRP_OPT_MAX_CMD_PER_LUN = 1 << 6, SRP_OPT_IO_CLASS = 1 << 7, SRP_OPT_INITIATOR_EXT = 1 << 8, SRP_OPT_ALL = (SRP_OPT_ID_EXT | SRP_OPT_IOC_GUID | SRP_OPT_DGID | SRP_OPT_PKEY | SRP_OPT_SERVICE_ID), }; static const match_table_t srp_opt_tokens = { { SRP_OPT_ID_EXT, "id_ext=%s" }, { SRP_OPT_IOC_GUID, "ioc_guid=%s" }, { SRP_OPT_DGID, "dgid=%s" }, { SRP_OPT_PKEY, "pkey=%x" }, { SRP_OPT_SERVICE_ID, "service_id=%s" }, { SRP_OPT_MAX_SECT, "max_sect=%d" }, { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" }, { SRP_OPT_IO_CLASS, "io_class=%x" }, { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" }, { SRP_OPT_ERR, NULL } }; static int srp_parse_options(const char *buf, struct srp_target_port *target) { char *options, *sep_opt; char *p; char dgid[3]; substring_t args[MAX_OPT_ARGS]; int opt_mask = 0; int token; int ret = -EINVAL; int i; options = kstrdup(buf, GFP_KERNEL); if (!options) return -ENOMEM; sep_opt = options; while ((p = strsep(&sep_opt, ",")) != NULL) { if (!*p) continue; token = match_token(p, srp_opt_tokens, args); opt_mask |= token; switch (token) { case SRP_OPT_ID_EXT: p = match_strdup(args); if (!p) { ret = -ENOMEM; goto out; } target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16)); kfree(p); break; case SRP_OPT_IOC_GUID: p = match_strdup(args); if (!p) { ret = -ENOMEM; goto out; } target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16)); kfree(p); break; case SRP_OPT_DGID: p = match_strdup(args); if (!p) { ret = -ENOMEM; goto out; } if (strlen(p) != 32) { printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p); kfree(p); goto out; } for (i = 0; i < 16; ++i) { strlcpy(dgid, p + i * 2, 3); target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16); } kfree(p); memcpy(target->orig_dgid, target->path.dgid.raw, 16); break; case SRP_OPT_PKEY: if (match_hex(args, &token)) { printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p); goto out; } target->path.pkey = cpu_to_be16(token); break; case SRP_OPT_SERVICE_ID: p = match_strdup(args); if (!p) { ret = -ENOMEM; goto out; } target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16)); target->path.service_id = target->service_id; kfree(p); break; case SRP_OPT_MAX_SECT: if (match_int(args, &token)) { printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p); goto out; } target->scsi_host->max_sectors = token; break; case SRP_OPT_MAX_CMD_PER_LUN: if (match_int(args, &token)) { printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p); goto out; } target->scsi_host->cmd_per_lun = min(token, SRP_CMD_SQ_SIZE); break; case SRP_OPT_IO_CLASS: if (match_hex(args, &token)) { printk(KERN_WARNING PFX "bad IO class parameter '%s' \n", p); goto out; } if (token != SRP_REV10_IB_IO_CLASS && token != SRP_REV16A_IB_IO_CLASS) { printk(KERN_WARNING PFX "unknown IO class parameter value" " %x specified (use %x or %x).\n", token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS); goto out; } target->io_class = token; break; case SRP_OPT_INITIATOR_EXT: p = match_strdup(args); if (!p) { ret = -ENOMEM; goto out; } target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16)); kfree(p); break; default: printk(KERN_WARNING PFX "unknown parameter or missing value " "'%s' in target creation request\n", p); goto out; } } if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL) ret = 0; else for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i) if ((srp_opt_tokens[i].token & SRP_OPT_ALL) && !(srp_opt_tokens[i].token & opt_mask)) printk(KERN_WARNING PFX "target creation request is " "missing parameter '%s'\n", srp_opt_tokens[i].pattern); out: kfree(options); return ret; } static ssize_t srp_create_target(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct srp_host *host = container_of(dev, struct srp_host, dev); struct Scsi_Host *target_host; struct srp_target_port *target; int ret; int i; target_host = scsi_host_alloc(&srp_template, sizeof (struct srp_target_port)); if (!target_host) return -ENOMEM; target_host->transportt = ib_srp_transport_template; target_host->max_lun = SRP_MAX_LUN; target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb; target = host_to_target(target_host); target->io_class = SRP_REV16A_IB_IO_CLASS; target->scsi_host = target_host; target->srp_host = host; spin_lock_init(&target->lock); INIT_LIST_HEAD(&target->free_tx); INIT_LIST_HEAD(&target->free_reqs); for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) { target->req_ring[i].index = i; list_add_tail(&target->req_ring[i].list, &target->free_reqs); } ret = srp_parse_options(buf, target); if (ret) goto err; ib_query_gid(host->srp_dev->dev, host->port, 0, &target->path.sgid); shost_printk(KERN_DEBUG, target->scsi_host, PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x " "service_id %016llx dgid %pI6\n", (unsigned long long) be64_to_cpu(target->id_ext), (unsigned long long) be64_to_cpu(target->ioc_guid), be16_to_cpu(target->path.pkey), (unsigned long long) be64_to_cpu(target->service_id), target->path.dgid.raw); ret = srp_create_target_ib(target); if (ret) goto err; ret = srp_new_cm_id(target); if (ret) goto err_free; target->qp_in_error = 0; ret = srp_connect_target(target); if (ret) { shost_printk(KERN_ERR, target->scsi_host, PFX "Connection failed\n"); goto err_cm_id; } ret = srp_add_target(host, target); if (ret) goto err_disconnect; return count; err_disconnect: srp_disconnect_target(target); err_cm_id: ib_destroy_cm_id(target->cm_id); err_free: srp_free_target_ib(target); err: scsi_host_put(target_host); return ret; } static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target); static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr, char *buf) { struct srp_host *host = container_of(dev, struct srp_host, dev); return sprintf(buf, "%s\n", host->srp_dev->dev->name); } static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); static ssize_t show_port(struct device *dev, struct device_attribute *attr, char *buf) { struct srp_host *host = container_of(dev, struct srp_host, dev); return sprintf(buf, "%d\n", host->port); } static DEVICE_ATTR(port, S_IRUGO, show_port, NULL); static struct srp_host *srp_add_port(struct srp_device *device, u8 port) { struct srp_host *host; host = kzalloc(sizeof *host, GFP_KERNEL); if (!host) return NULL; INIT_LIST_HEAD(&host->target_list); spin_lock_init(&host->target_lock); init_completion(&host->released); host->srp_dev = device; host->port = port; host->dev.class = &srp_class; host->dev.parent = device->dev->dma_device; dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port); if (device_register(&host->dev)) goto free_host; if (device_create_file(&host->dev, &dev_attr_add_target)) goto err_class; if (device_create_file(&host->dev, &dev_attr_ibdev)) goto err_class; if (device_create_file(&host->dev, &dev_attr_port)) goto err_class; return host; err_class: device_unregister(&host->dev); free_host: kfree(host); return NULL; } static void srp_add_one(struct ib_device *device) { struct srp_device *srp_dev; struct ib_device_attr *dev_attr; struct ib_fmr_pool_param fmr_param; struct srp_host *host; int s, e, p; dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL); if (!dev_attr) return; if (ib_query_device(device, dev_attr)) { printk(KERN_WARNING PFX "Query device failed for %s\n", device->name); goto free_attr; } srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL); if (!srp_dev) goto free_attr; /* * Use the smallest page size supported by the HCA, down to a * minimum of 512 bytes (which is the smallest sector that a * SCSI command will ever carry). */ srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1); srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift; srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1); INIT_LIST_HEAD(&srp_dev->dev_list); srp_dev->dev = device; srp_dev->pd = ib_alloc_pd(device); if (IS_ERR(srp_dev->pd)) goto free_dev; srp_dev->mr = ib_get_dma_mr(srp_dev->pd, IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ | IB_ACCESS_REMOTE_WRITE); if (IS_ERR(srp_dev->mr)) goto err_pd; memset(&fmr_param, 0, sizeof fmr_param); fmr_param.pool_size = SRP_FMR_POOL_SIZE; fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE; fmr_param.cache = 1; fmr_param.max_pages_per_fmr = SRP_FMR_SIZE; fmr_param.page_shift = srp_dev->fmr_page_shift; fmr_param.access = (IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_WRITE | IB_ACCESS_REMOTE_READ); srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param); if (IS_ERR(srp_dev->fmr_pool)) srp_dev->fmr_pool = NULL; if (device->node_type == RDMA_NODE_IB_SWITCH) { s = 0; e = 0; } else { s = 1; e = device->phys_port_cnt; } for (p = s; p <= e; ++p) { host = srp_add_port(srp_dev, p); if (host) list_add_tail(&host->list, &srp_dev->dev_list); } ib_set_client_data(device, &srp_client, srp_dev); goto free_attr; err_pd: ib_dealloc_pd(srp_dev->pd); free_dev: kfree(srp_dev); free_attr: kfree(dev_attr); } static void srp_remove_one(struct ib_device *device) { struct srp_device *srp_dev; struct srp_host *host, *tmp_host; LIST_HEAD(target_list); struct srp_target_port *target, *tmp_target; srp_dev = ib_get_client_data(device, &srp_client); list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) { device_unregister(&host->dev); /* * Wait for the sysfs entry to go away, so that no new * target ports can be created. */ wait_for_completion(&host->released); /* * Mark all target ports as removed, so we stop queueing * commands and don't try to reconnect. */ spin_lock(&host->target_lock); list_for_each_entry(target, &host->target_list, list) { spin_lock_irq(&target->lock); target->state = SRP_TARGET_REMOVED; spin_unlock_irq(&target->lock); } spin_unlock(&host->target_lock); /* * Wait for any reconnection tasks that may have * started before we marked our target ports as * removed, and any target port removal tasks. */ flush_scheduled_work(); list_for_each_entry_safe(target, tmp_target, &host->target_list, list) { srp_remove_host(target->scsi_host); scsi_remove_host(target->scsi_host); srp_disconnect_target(target); ib_destroy_cm_id(target->cm_id); srp_free_target_ib(target); scsi_host_put(target->scsi_host); } kfree(host); } if (srp_dev->fmr_pool) ib_destroy_fmr_pool(srp_dev->fmr_pool); ib_dereg_mr(srp_dev->mr); ib_dealloc_pd(srp_dev->pd); kfree(srp_dev); } static struct srp_function_template ib_srp_transport_functions = { }; static int __init srp_init_module(void) { int ret; BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *)); if (srp_sg_tablesize > 255) { printk(KERN_WARNING PFX "Clamping srp_sg_tablesize to 255\n"); srp_sg_tablesize = 255; } ib_srp_transport_template = srp_attach_transport(&ib_srp_transport_functions); if (!ib_srp_transport_template) return -ENOMEM; srp_template.sg_tablesize = srp_sg_tablesize; srp_max_iu_len = (sizeof (struct srp_cmd) + sizeof (struct srp_indirect_buf) + srp_sg_tablesize * 16); ret = class_register(&srp_class); if (ret) { printk(KERN_ERR PFX "couldn't register class infiniband_srp\n"); srp_release_transport(ib_srp_transport_template); return ret; } ib_sa_register_client(&srp_sa_client); ret = ib_register_client(&srp_client); if (ret) { printk(KERN_ERR PFX "couldn't register IB client\n"); srp_release_transport(ib_srp_transport_template); ib_sa_unregister_client(&srp_sa_client); class_unregister(&srp_class); return ret; } return 0; } static void __exit srp_cleanup_module(void) { ib_unregister_client(&srp_client); ib_sa_unregister_client(&srp_sa_client); class_unregister(&srp_class); srp_release_transport(ib_srp_transport_template); } module_init(srp_init_module); module_exit(srp_cleanup_module);