From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/drivers/infiniband/ulp/isert/Kconfig | 5 + kernel/drivers/infiniband/ulp/isert/Makefile | 2 + kernel/drivers/infiniband/ulp/isert/ib_isert.c | 3466 +++++++++++++++++++++ kernel/drivers/infiniband/ulp/isert/ib_isert.h | 231 ++ kernel/drivers/infiniband/ulp/isert/isert_proto.h | 47 + 5 files changed, 3751 insertions(+) create mode 100644 kernel/drivers/infiniband/ulp/isert/Kconfig create mode 100644 kernel/drivers/infiniband/ulp/isert/Makefile create mode 100644 kernel/drivers/infiniband/ulp/isert/ib_isert.c create mode 100644 kernel/drivers/infiniband/ulp/isert/ib_isert.h create mode 100644 kernel/drivers/infiniband/ulp/isert/isert_proto.h (limited to 'kernel/drivers/infiniband/ulp/isert') diff --git a/kernel/drivers/infiniband/ulp/isert/Kconfig b/kernel/drivers/infiniband/ulp/isert/Kconfig new file mode 100644 index 000000000..02f9759eb --- /dev/null +++ b/kernel/drivers/infiniband/ulp/isert/Kconfig @@ -0,0 +1,5 @@ +config INFINIBAND_ISERT + tristate "iSCSI Extensions for RDMA (iSER) target support" + depends on INET && INFINIBAND_ADDR_TRANS && TARGET_CORE && ISCSI_TARGET + ---help--- + Support for iSCSI Extensions for RDMA (iSER) Target on Infiniband fabrics. diff --git a/kernel/drivers/infiniband/ulp/isert/Makefile b/kernel/drivers/infiniband/ulp/isert/Makefile new file mode 100644 index 000000000..c8bf2421f --- /dev/null +++ b/kernel/drivers/infiniband/ulp/isert/Makefile @@ -0,0 +1,2 @@ +ccflags-y := -Idrivers/target -Idrivers/target/iscsi +obj-$(CONFIG_INFINIBAND_ISERT) += ib_isert.o diff --git a/kernel/drivers/infiniband/ulp/isert/ib_isert.c b/kernel/drivers/infiniband/ulp/isert/ib_isert.c new file mode 100644 index 000000000..575a072d7 --- /dev/null +++ b/kernel/drivers/infiniband/ulp/isert/ib_isert.c @@ -0,0 +1,3466 @@ +/******************************************************************************* + * This file contains iSCSI extentions for RDMA (iSER) Verbs + * + * (c) Copyright 2013 Datera, Inc. + * + * Nicholas A. Bellinger + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + ****************************************************************************/ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "isert_proto.h" +#include "ib_isert.h" + +#define ISERT_MAX_CONN 8 +#define ISER_MAX_RX_CQ_LEN (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN) +#define ISER_MAX_TX_CQ_LEN (ISERT_QP_MAX_REQ_DTOS * ISERT_MAX_CONN) +#define ISER_MAX_CQ_LEN (ISER_MAX_RX_CQ_LEN + ISER_MAX_TX_CQ_LEN + \ + ISERT_MAX_CONN) + +static int isert_debug_level; +module_param_named(debug_level, isert_debug_level, int, 0644); +MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:0)"); + +static DEFINE_MUTEX(device_list_mutex); +static LIST_HEAD(device_list); +static struct workqueue_struct *isert_comp_wq; +static struct workqueue_struct *isert_release_wq; + +static void +isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn); +static int +isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd, + struct isert_rdma_wr *wr); +static void +isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn); +static int +isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd, + struct isert_rdma_wr *wr); +static int +isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd); +static int +isert_rdma_post_recvl(struct isert_conn *isert_conn); +static int +isert_rdma_accept(struct isert_conn *isert_conn); +struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np); + +static void isert_release_work(struct work_struct *work); + +static inline bool +isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd) +{ + return (conn->pi_support && + cmd->prot_op != TARGET_PROT_NORMAL); +} + + +static void +isert_qp_event_callback(struct ib_event *e, void *context) +{ + struct isert_conn *isert_conn = context; + + isert_err("conn %p event: %d\n", isert_conn, e->event); + switch (e->event) { + case IB_EVENT_COMM_EST: + rdma_notify(isert_conn->cm_id, IB_EVENT_COMM_EST); + break; + case IB_EVENT_QP_LAST_WQE_REACHED: + isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n"); + break; + default: + break; + } +} + +static int +isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr) +{ + int ret; + + ret = ib_query_device(ib_dev, devattr); + if (ret) { + isert_err("ib_query_device() failed: %d\n", ret); + return ret; + } + isert_dbg("devattr->max_sge: %d\n", devattr->max_sge); + isert_dbg("devattr->max_sge_rd: %d\n", devattr->max_sge_rd); + + return 0; +} + +static struct isert_comp * +isert_comp_get(struct isert_conn *isert_conn) +{ + struct isert_device *device = isert_conn->device; + struct isert_comp *comp; + int i, min = 0; + + mutex_lock(&device_list_mutex); + for (i = 0; i < device->comps_used; i++) + if (device->comps[i].active_qps < + device->comps[min].active_qps) + min = i; + comp = &device->comps[min]; + comp->active_qps++; + mutex_unlock(&device_list_mutex); + + isert_info("conn %p, using comp %p min_index: %d\n", + isert_conn, comp, min); + + return comp; +} + +static void +isert_comp_put(struct isert_comp *comp) +{ + mutex_lock(&device_list_mutex); + comp->active_qps--; + mutex_unlock(&device_list_mutex); +} + +static struct ib_qp * +isert_create_qp(struct isert_conn *isert_conn, + struct isert_comp *comp, + struct rdma_cm_id *cma_id) +{ + struct isert_device *device = isert_conn->device; + struct ib_qp_init_attr attr; + int ret; + + memset(&attr, 0, sizeof(struct ib_qp_init_attr)); + attr.event_handler = isert_qp_event_callback; + attr.qp_context = isert_conn; + attr.send_cq = comp->cq; + attr.recv_cq = comp->cq; + attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS; + attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1; + /* + * FIXME: Use devattr.max_sge - 2 for max_send_sge as + * work-around for RDMA_READs with ConnectX-2. + * + * Also, still make sure to have at least two SGEs for + * outgoing control PDU responses. + */ + attr.cap.max_send_sge = max(2, device->dev_attr.max_sge - 2); + isert_conn->max_sge = attr.cap.max_send_sge; + + attr.cap.max_recv_sge = 1; + attr.sq_sig_type = IB_SIGNAL_REQ_WR; + attr.qp_type = IB_QPT_RC; + if (device->pi_capable) + attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN; + + ret = rdma_create_qp(cma_id, device->pd, &attr); + if (ret) { + isert_err("rdma_create_qp failed for cma_id %d\n", ret); + return ERR_PTR(ret); + } + + return cma_id->qp; +} + +static int +isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id) +{ + struct isert_comp *comp; + int ret; + + comp = isert_comp_get(isert_conn); + isert_conn->qp = isert_create_qp(isert_conn, comp, cma_id); + if (IS_ERR(isert_conn->qp)) { + ret = PTR_ERR(isert_conn->qp); + goto err; + } + + return 0; +err: + isert_comp_put(comp); + return ret; +} + +static void +isert_cq_event_callback(struct ib_event *e, void *context) +{ + isert_dbg("event: %d\n", e->event); +} + +static int +isert_alloc_rx_descriptors(struct isert_conn *isert_conn) +{ + struct isert_device *device = isert_conn->device; + struct ib_device *ib_dev = device->ib_device; + struct iser_rx_desc *rx_desc; + struct ib_sge *rx_sg; + u64 dma_addr; + int i, j; + + isert_conn->rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS * + sizeof(struct iser_rx_desc), GFP_KERNEL); + if (!isert_conn->rx_descs) + goto fail; + + rx_desc = isert_conn->rx_descs; + + for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) { + dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc, + ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); + if (ib_dma_mapping_error(ib_dev, dma_addr)) + goto dma_map_fail; + + rx_desc->dma_addr = dma_addr; + + rx_sg = &rx_desc->rx_sg; + rx_sg->addr = rx_desc->dma_addr; + rx_sg->length = ISER_RX_PAYLOAD_SIZE; + rx_sg->lkey = device->mr->lkey; + } + + isert_conn->rx_desc_head = 0; + + return 0; + +dma_map_fail: + rx_desc = isert_conn->rx_descs; + for (j = 0; j < i; j++, rx_desc++) { + ib_dma_unmap_single(ib_dev, rx_desc->dma_addr, + ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); + } + kfree(isert_conn->rx_descs); + isert_conn->rx_descs = NULL; +fail: + isert_err("conn %p failed to allocate rx descriptors\n", isert_conn); + + return -ENOMEM; +} + +static void +isert_free_rx_descriptors(struct isert_conn *isert_conn) +{ + struct ib_device *ib_dev = isert_conn->device->ib_device; + struct iser_rx_desc *rx_desc; + int i; + + if (!isert_conn->rx_descs) + return; + + rx_desc = isert_conn->rx_descs; + for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) { + ib_dma_unmap_single(ib_dev, rx_desc->dma_addr, + ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); + } + + kfree(isert_conn->rx_descs); + isert_conn->rx_descs = NULL; +} + +static void isert_cq_work(struct work_struct *); +static void isert_cq_callback(struct ib_cq *, void *); + +static void +isert_free_comps(struct isert_device *device) +{ + int i; + + for (i = 0; i < device->comps_used; i++) { + struct isert_comp *comp = &device->comps[i]; + + if (comp->cq) { + cancel_work_sync(&comp->work); + ib_destroy_cq(comp->cq); + } + } + kfree(device->comps); +} + +static int +isert_alloc_comps(struct isert_device *device, + struct ib_device_attr *attr) +{ + int i, max_cqe, ret = 0; + + device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(), + device->ib_device->num_comp_vectors)); + + isert_info("Using %d CQs, %s supports %d vectors support " + "Fast registration %d pi_capable %d\n", + device->comps_used, device->ib_device->name, + device->ib_device->num_comp_vectors, device->use_fastreg, + device->pi_capable); + + device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp), + GFP_KERNEL); + if (!device->comps) { + isert_err("Unable to allocate completion contexts\n"); + return -ENOMEM; + } + + max_cqe = min(ISER_MAX_CQ_LEN, attr->max_cqe); + + for (i = 0; i < device->comps_used; i++) { + struct isert_comp *comp = &device->comps[i]; + + comp->device = device; + INIT_WORK(&comp->work, isert_cq_work); + comp->cq = ib_create_cq(device->ib_device, + isert_cq_callback, + isert_cq_event_callback, + (void *)comp, + max_cqe, i); + if (IS_ERR(comp->cq)) { + isert_err("Unable to allocate cq\n"); + ret = PTR_ERR(comp->cq); + comp->cq = NULL; + goto out_cq; + } + + ret = ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP); + if (ret) + goto out_cq; + } + + return 0; +out_cq: + isert_free_comps(device); + return ret; +} + +static int +isert_create_device_ib_res(struct isert_device *device) +{ + struct ib_device_attr *dev_attr; + int ret; + + dev_attr = &device->dev_attr; + ret = isert_query_device(device->ib_device, dev_attr); + if (ret) + return ret; + + /* asign function handlers */ + if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS && + dev_attr->device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) { + device->use_fastreg = 1; + device->reg_rdma_mem = isert_reg_rdma; + device->unreg_rdma_mem = isert_unreg_rdma; + } else { + device->use_fastreg = 0; + device->reg_rdma_mem = isert_map_rdma; + device->unreg_rdma_mem = isert_unmap_cmd; + } + + ret = isert_alloc_comps(device, dev_attr); + if (ret) + return ret; + + device->pd = ib_alloc_pd(device->ib_device); + if (IS_ERR(device->pd)) { + ret = PTR_ERR(device->pd); + isert_err("failed to allocate pd, device %p, ret=%d\n", + device, ret); + goto out_cq; + } + + device->mr = ib_get_dma_mr(device->pd, IB_ACCESS_LOCAL_WRITE); + if (IS_ERR(device->mr)) { + ret = PTR_ERR(device->mr); + isert_err("failed to create dma mr, device %p, ret=%d\n", + device, ret); + goto out_mr; + } + + /* Check signature cap */ + device->pi_capable = dev_attr->device_cap_flags & + IB_DEVICE_SIGNATURE_HANDOVER ? true : false; + + return 0; + +out_mr: + ib_dealloc_pd(device->pd); +out_cq: + isert_free_comps(device); + return ret; +} + +static void +isert_free_device_ib_res(struct isert_device *device) +{ + isert_info("device %p\n", device); + + ib_dereg_mr(device->mr); + ib_dealloc_pd(device->pd); + isert_free_comps(device); +} + +static void +isert_device_put(struct isert_device *device) +{ + mutex_lock(&device_list_mutex); + device->refcount--; + isert_info("device %p refcount %d\n", device, device->refcount); + if (!device->refcount) { + isert_free_device_ib_res(device); + list_del(&device->dev_node); + kfree(device); + } + mutex_unlock(&device_list_mutex); +} + +static struct isert_device * +isert_device_get(struct rdma_cm_id *cma_id) +{ + struct isert_device *device; + int ret; + + mutex_lock(&device_list_mutex); + list_for_each_entry(device, &device_list, dev_node) { + if (device->ib_device->node_guid == cma_id->device->node_guid) { + device->refcount++; + isert_info("Found iser device %p refcount %d\n", + device, device->refcount); + mutex_unlock(&device_list_mutex); + return device; + } + } + + device = kzalloc(sizeof(struct isert_device), GFP_KERNEL); + if (!device) { + mutex_unlock(&device_list_mutex); + return ERR_PTR(-ENOMEM); + } + + INIT_LIST_HEAD(&device->dev_node); + + device->ib_device = cma_id->device; + ret = isert_create_device_ib_res(device); + if (ret) { + kfree(device); + mutex_unlock(&device_list_mutex); + return ERR_PTR(ret); + } + + device->refcount++; + list_add_tail(&device->dev_node, &device_list); + isert_info("Created a new iser device %p refcount %d\n", + device, device->refcount); + mutex_unlock(&device_list_mutex); + + return device; +} + +static void +isert_conn_free_fastreg_pool(struct isert_conn *isert_conn) +{ + struct fast_reg_descriptor *fr_desc, *tmp; + int i = 0; + + if (list_empty(&isert_conn->fr_pool)) + return; + + isert_info("Freeing conn %p fastreg pool", isert_conn); + + list_for_each_entry_safe(fr_desc, tmp, + &isert_conn->fr_pool, list) { + list_del(&fr_desc->list); + ib_free_fast_reg_page_list(fr_desc->data_frpl); + ib_dereg_mr(fr_desc->data_mr); + if (fr_desc->pi_ctx) { + ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl); + ib_dereg_mr(fr_desc->pi_ctx->prot_mr); + ib_destroy_mr(fr_desc->pi_ctx->sig_mr); + kfree(fr_desc->pi_ctx); + } + kfree(fr_desc); + ++i; + } + + if (i < isert_conn->fr_pool_size) + isert_warn("Pool still has %d regions registered\n", + isert_conn->fr_pool_size - i); +} + +static int +isert_create_pi_ctx(struct fast_reg_descriptor *desc, + struct ib_device *device, + struct ib_pd *pd) +{ + struct ib_mr_init_attr mr_init_attr; + struct pi_context *pi_ctx; + int ret; + + pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL); + if (!pi_ctx) { + isert_err("Failed to allocate pi context\n"); + return -ENOMEM; + } + + pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(device, + ISCSI_ISER_SG_TABLESIZE); + if (IS_ERR(pi_ctx->prot_frpl)) { + isert_err("Failed to allocate prot frpl err=%ld\n", + PTR_ERR(pi_ctx->prot_frpl)); + ret = PTR_ERR(pi_ctx->prot_frpl); + goto err_pi_ctx; + } + + pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE); + if (IS_ERR(pi_ctx->prot_mr)) { + isert_err("Failed to allocate prot frmr err=%ld\n", + PTR_ERR(pi_ctx->prot_mr)); + ret = PTR_ERR(pi_ctx->prot_mr); + goto err_prot_frpl; + } + desc->ind |= ISERT_PROT_KEY_VALID; + + memset(&mr_init_attr, 0, sizeof(mr_init_attr)); + mr_init_attr.max_reg_descriptors = 2; + mr_init_attr.flags |= IB_MR_SIGNATURE_EN; + pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr); + if (IS_ERR(pi_ctx->sig_mr)) { + isert_err("Failed to allocate signature enabled mr err=%ld\n", + PTR_ERR(pi_ctx->sig_mr)); + ret = PTR_ERR(pi_ctx->sig_mr); + goto err_prot_mr; + } + + desc->pi_ctx = pi_ctx; + desc->ind |= ISERT_SIG_KEY_VALID; + desc->ind &= ~ISERT_PROTECTED; + + return 0; + +err_prot_mr: + ib_dereg_mr(pi_ctx->prot_mr); +err_prot_frpl: + ib_free_fast_reg_page_list(pi_ctx->prot_frpl); +err_pi_ctx: + kfree(pi_ctx); + + return ret; +} + +static int +isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd, + struct fast_reg_descriptor *fr_desc) +{ + int ret; + + fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device, + ISCSI_ISER_SG_TABLESIZE); + if (IS_ERR(fr_desc->data_frpl)) { + isert_err("Failed to allocate data frpl err=%ld\n", + PTR_ERR(fr_desc->data_frpl)); + return PTR_ERR(fr_desc->data_frpl); + } + + fr_desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE); + if (IS_ERR(fr_desc->data_mr)) { + isert_err("Failed to allocate data frmr err=%ld\n", + PTR_ERR(fr_desc->data_mr)); + ret = PTR_ERR(fr_desc->data_mr); + goto err_data_frpl; + } + fr_desc->ind |= ISERT_DATA_KEY_VALID; + + isert_dbg("Created fr_desc %p\n", fr_desc); + + return 0; + +err_data_frpl: + ib_free_fast_reg_page_list(fr_desc->data_frpl); + + return ret; +} + +static int +isert_conn_create_fastreg_pool(struct isert_conn *isert_conn) +{ + struct fast_reg_descriptor *fr_desc; + struct isert_device *device = isert_conn->device; + struct se_session *se_sess = isert_conn->conn->sess->se_sess; + struct se_node_acl *se_nacl = se_sess->se_node_acl; + int i, ret, tag_num; + /* + * Setup the number of FRMRs based upon the number of tags + * available to session in iscsi_target_locate_portal(). + */ + tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth); + tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS; + + isert_conn->fr_pool_size = 0; + for (i = 0; i < tag_num; i++) { + fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL); + if (!fr_desc) { + isert_err("Failed to allocate fast_reg descriptor\n"); + ret = -ENOMEM; + goto err; + } + + ret = isert_create_fr_desc(device->ib_device, + device->pd, fr_desc); + if (ret) { + isert_err("Failed to create fastreg descriptor err=%d\n", + ret); + kfree(fr_desc); + goto err; + } + + list_add_tail(&fr_desc->list, &isert_conn->fr_pool); + isert_conn->fr_pool_size++; + } + + isert_dbg("Creating conn %p fastreg pool size=%d", + isert_conn, isert_conn->fr_pool_size); + + return 0; + +err: + isert_conn_free_fastreg_pool(isert_conn); + return ret; +} + +static void +isert_init_conn(struct isert_conn *isert_conn) +{ + isert_conn->state = ISER_CONN_INIT; + INIT_LIST_HEAD(&isert_conn->accept_node); + init_completion(&isert_conn->login_comp); + init_completion(&isert_conn->login_req_comp); + init_completion(&isert_conn->wait); + kref_init(&isert_conn->kref); + mutex_init(&isert_conn->mutex); + spin_lock_init(&isert_conn->pool_lock); + INIT_LIST_HEAD(&isert_conn->fr_pool); + INIT_WORK(&isert_conn->release_work, isert_release_work); +} + +static void +isert_free_login_buf(struct isert_conn *isert_conn) +{ + struct ib_device *ib_dev = isert_conn->device->ib_device; + + ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma, + ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE); + ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma, + ISCSI_DEF_MAX_RECV_SEG_LEN, + DMA_FROM_DEVICE); + kfree(isert_conn->login_buf); +} + +static int +isert_alloc_login_buf(struct isert_conn *isert_conn, + struct ib_device *ib_dev) +{ + int ret; + + isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN + + ISER_RX_LOGIN_SIZE, GFP_KERNEL); + if (!isert_conn->login_buf) { + isert_err("Unable to allocate isert_conn->login_buf\n"); + return -ENOMEM; + } + + isert_conn->login_req_buf = isert_conn->login_buf; + isert_conn->login_rsp_buf = isert_conn->login_buf + + ISCSI_DEF_MAX_RECV_SEG_LEN; + + isert_dbg("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n", + isert_conn->login_buf, isert_conn->login_req_buf, + isert_conn->login_rsp_buf); + + isert_conn->login_req_dma = ib_dma_map_single(ib_dev, + (void *)isert_conn->login_req_buf, + ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE); + + ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma); + if (ret) { + isert_err("login_req_dma mapping error: %d\n", ret); + isert_conn->login_req_dma = 0; + goto out_login_buf; + } + + isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev, + (void *)isert_conn->login_rsp_buf, + ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE); + + ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma); + if (ret) { + isert_err("login_rsp_dma mapping error: %d\n", ret); + isert_conn->login_rsp_dma = 0; + goto out_req_dma_map; + } + + return 0; + +out_req_dma_map: + ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma, + ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE); +out_login_buf: + kfree(isert_conn->login_buf); + return ret; +} + +static int +isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) +{ + struct isert_np *isert_np = cma_id->context; + struct iscsi_np *np = isert_np->np; + struct isert_conn *isert_conn; + struct isert_device *device; + int ret = 0; + + spin_lock_bh(&np->np_thread_lock); + if (!np->enabled) { + spin_unlock_bh(&np->np_thread_lock); + isert_dbg("iscsi_np is not enabled, reject connect request\n"); + return rdma_reject(cma_id, NULL, 0); + } + spin_unlock_bh(&np->np_thread_lock); + + isert_dbg("cma_id: %p, portal: %p\n", + cma_id, cma_id->context); + + isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL); + if (!isert_conn) + return -ENOMEM; + + isert_init_conn(isert_conn); + isert_conn->cm_id = cma_id; + + ret = isert_alloc_login_buf(isert_conn, cma_id->device); + if (ret) + goto out; + + device = isert_device_get(cma_id); + if (IS_ERR(device)) { + ret = PTR_ERR(device); + goto out_rsp_dma_map; + } + isert_conn->device = device; + + /* Set max inflight RDMA READ requests */ + isert_conn->initiator_depth = min_t(u8, + event->param.conn.initiator_depth, + device->dev_attr.max_qp_init_rd_atom); + isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth); + + ret = isert_conn_setup_qp(isert_conn, cma_id); + if (ret) + goto out_conn_dev; + + ret = isert_rdma_post_recvl(isert_conn); + if (ret) + goto out_conn_dev; + + ret = isert_rdma_accept(isert_conn); + if (ret) + goto out_conn_dev; + + mutex_lock(&isert_np->np_accept_mutex); + list_add_tail(&isert_conn->accept_node, &isert_np->np_accept_list); + mutex_unlock(&isert_np->np_accept_mutex); + + isert_info("np %p: Allow accept_np to continue\n", np); + up(&isert_np->np_sem); + return 0; + +out_conn_dev: + isert_device_put(device); +out_rsp_dma_map: + isert_free_login_buf(isert_conn); +out: + kfree(isert_conn); + rdma_reject(cma_id, NULL, 0); + return ret; +} + +static void +isert_connect_release(struct isert_conn *isert_conn) +{ + struct isert_device *device = isert_conn->device; + + isert_dbg("conn %p\n", isert_conn); + + BUG_ON(!device); + + if (device->use_fastreg) + isert_conn_free_fastreg_pool(isert_conn); + + isert_free_rx_descriptors(isert_conn); + if (isert_conn->cm_id) + rdma_destroy_id(isert_conn->cm_id); + + if (isert_conn->qp) { + struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context; + + isert_comp_put(comp); + ib_destroy_qp(isert_conn->qp); + } + + if (isert_conn->login_buf) + isert_free_login_buf(isert_conn); + + isert_device_put(device); + + kfree(isert_conn); +} + +static void +isert_connected_handler(struct rdma_cm_id *cma_id) +{ + struct isert_conn *isert_conn = cma_id->qp->qp_context; + + isert_info("conn %p\n", isert_conn); + + if (!kref_get_unless_zero(&isert_conn->kref)) { + isert_warn("conn %p connect_release is running\n", isert_conn); + return; + } + + mutex_lock(&isert_conn->mutex); + if (isert_conn->state != ISER_CONN_FULL_FEATURE) + isert_conn->state = ISER_CONN_UP; + mutex_unlock(&isert_conn->mutex); +} + +static void +isert_release_kref(struct kref *kref) +{ + struct isert_conn *isert_conn = container_of(kref, + struct isert_conn, kref); + + isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm, + current->pid); + + isert_connect_release(isert_conn); +} + +static void +isert_put_conn(struct isert_conn *isert_conn) +{ + kref_put(&isert_conn->kref, isert_release_kref); +} + +/** + * isert_conn_terminate() - Initiate connection termination + * @isert_conn: isert connection struct + * + * Notes: + * In case the connection state is FULL_FEATURE, move state + * to TEMINATING and start teardown sequence (rdma_disconnect). + * In case the connection state is UP, complete flush as well. + * + * This routine must be called with mutex held. Thus it is + * safe to call multiple times. + */ +static void +isert_conn_terminate(struct isert_conn *isert_conn) +{ + int err; + + switch (isert_conn->state) { + case ISER_CONN_TERMINATING: + break; + case ISER_CONN_UP: + case ISER_CONN_FULL_FEATURE: /* FALLTHRU */ + isert_info("Terminating conn %p state %d\n", + isert_conn, isert_conn->state); + isert_conn->state = ISER_CONN_TERMINATING; + err = rdma_disconnect(isert_conn->cm_id); + if (err) + isert_warn("Failed rdma_disconnect isert_conn %p\n", + isert_conn); + break; + default: + isert_warn("conn %p teminating in state %d\n", + isert_conn, isert_conn->state); + } +} + +static int +isert_np_cma_handler(struct isert_np *isert_np, + enum rdma_cm_event_type event) +{ + isert_dbg("isert np %p, handling event %d\n", isert_np, event); + + switch (event) { + case RDMA_CM_EVENT_DEVICE_REMOVAL: + isert_np->np_cm_id = NULL; + break; + case RDMA_CM_EVENT_ADDR_CHANGE: + isert_np->np_cm_id = isert_setup_id(isert_np); + if (IS_ERR(isert_np->np_cm_id)) { + isert_err("isert np %p setup id failed: %ld\n", + isert_np, PTR_ERR(isert_np->np_cm_id)); + isert_np->np_cm_id = NULL; + } + break; + default: + isert_err("isert np %p Unexpected event %d\n", + isert_np, event); + } + + return -1; +} + +static int +isert_disconnected_handler(struct rdma_cm_id *cma_id, + enum rdma_cm_event_type event) +{ + struct isert_np *isert_np = cma_id->context; + struct isert_conn *isert_conn; + bool terminating = false; + + if (isert_np->np_cm_id == cma_id) + return isert_np_cma_handler(cma_id->context, event); + + isert_conn = cma_id->qp->qp_context; + + mutex_lock(&isert_conn->mutex); + terminating = (isert_conn->state == ISER_CONN_TERMINATING); + isert_conn_terminate(isert_conn); + mutex_unlock(&isert_conn->mutex); + + isert_info("conn %p completing wait\n", isert_conn); + complete(&isert_conn->wait); + + if (terminating) + goto out; + + mutex_lock(&isert_np->np_accept_mutex); + if (!list_empty(&isert_conn->accept_node)) { + list_del_init(&isert_conn->accept_node); + isert_put_conn(isert_conn); + queue_work(isert_release_wq, &isert_conn->release_work); + } + mutex_unlock(&isert_np->np_accept_mutex); + +out: + return 0; +} + +static int +isert_connect_error(struct rdma_cm_id *cma_id) +{ + struct isert_conn *isert_conn = cma_id->qp->qp_context; + + isert_conn->cm_id = NULL; + isert_put_conn(isert_conn); + + return -1; +} + +static int +isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) +{ + int ret = 0; + + isert_info("event %d status %d id %p np %p\n", event->event, + event->status, cma_id, cma_id->context); + + switch (event->event) { + case RDMA_CM_EVENT_CONNECT_REQUEST: + ret = isert_connect_request(cma_id, event); + if (ret) + isert_err("failed handle connect request %d\n", ret); + break; + case RDMA_CM_EVENT_ESTABLISHED: + isert_connected_handler(cma_id); + break; + case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */ + case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */ + case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */ + case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */ + ret = isert_disconnected_handler(cma_id, event->event); + break; + case RDMA_CM_EVENT_REJECTED: /* FALLTHRU */ + case RDMA_CM_EVENT_UNREACHABLE: /* FALLTHRU */ + case RDMA_CM_EVENT_CONNECT_ERROR: + ret = isert_connect_error(cma_id); + break; + default: + isert_err("Unhandled RDMA CMA event: %d\n", event->event); + break; + } + + return ret; +} + +static int +isert_post_recv(struct isert_conn *isert_conn, u32 count) +{ + struct ib_recv_wr *rx_wr, *rx_wr_failed; + int i, ret; + unsigned int rx_head = isert_conn->rx_desc_head; + struct iser_rx_desc *rx_desc; + + for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) { + rx_desc = &isert_conn->rx_descs[rx_head]; + rx_wr->wr_id = (uintptr_t)rx_desc; + rx_wr->sg_list = &rx_desc->rx_sg; + rx_wr->num_sge = 1; + rx_wr->next = rx_wr + 1; + rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1); + } + + rx_wr--; + rx_wr->next = NULL; /* mark end of work requests list */ + + isert_conn->post_recv_buf_count += count; + ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr, + &rx_wr_failed); + if (ret) { + isert_err("ib_post_recv() failed with ret: %d\n", ret); + isert_conn->post_recv_buf_count -= count; + } else { + isert_dbg("Posted %d RX buffers\n", count); + isert_conn->rx_desc_head = rx_head; + } + return ret; +} + +static int +isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc) +{ + struct ib_device *ib_dev = isert_conn->cm_id->device; + struct ib_send_wr send_wr, *send_wr_failed; + int ret; + + ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr, + ISER_HEADERS_LEN, DMA_TO_DEVICE); + + send_wr.next = NULL; + send_wr.wr_id = (uintptr_t)tx_desc; + send_wr.sg_list = tx_desc->tx_sg; + send_wr.num_sge = tx_desc->num_sge; + send_wr.opcode = IB_WR_SEND; + send_wr.send_flags = IB_SEND_SIGNALED; + + ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed); + if (ret) + isert_err("ib_post_send() failed, ret: %d\n", ret); + + return ret; +} + +static void +isert_create_send_desc(struct isert_conn *isert_conn, + struct isert_cmd *isert_cmd, + struct iser_tx_desc *tx_desc) +{ + struct isert_device *device = isert_conn->device; + struct ib_device *ib_dev = device->ib_device; + + ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr, + ISER_HEADERS_LEN, DMA_TO_DEVICE); + + memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr)); + tx_desc->iser_header.flags = ISER_VER; + + tx_desc->num_sge = 1; + tx_desc->isert_cmd = isert_cmd; + + if (tx_desc->tx_sg[0].lkey != device->mr->lkey) { + tx_desc->tx_sg[0].lkey = device->mr->lkey; + isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc); + } +} + +static int +isert_init_tx_hdrs(struct isert_conn *isert_conn, + struct iser_tx_desc *tx_desc) +{ + struct isert_device *device = isert_conn->device; + struct ib_device *ib_dev = device->ib_device; + u64 dma_addr; + + dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc, + ISER_HEADERS_LEN, DMA_TO_DEVICE); + if (ib_dma_mapping_error(ib_dev, dma_addr)) { + isert_err("ib_dma_mapping_error() failed\n"); + return -ENOMEM; + } + + tx_desc->dma_addr = dma_addr; + tx_desc->tx_sg[0].addr = tx_desc->dma_addr; + tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; + tx_desc->tx_sg[0].lkey = device->mr->lkey; + + isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n", + tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length, + tx_desc->tx_sg[0].lkey); + + return 0; +} + +static void +isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, + struct ib_send_wr *send_wr) +{ + struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc; + + isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND; + send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc; + send_wr->opcode = IB_WR_SEND; + send_wr->sg_list = &tx_desc->tx_sg[0]; + send_wr->num_sge = isert_cmd->tx_desc.num_sge; + send_wr->send_flags = IB_SEND_SIGNALED; +} + +static int +isert_rdma_post_recvl(struct isert_conn *isert_conn) +{ + struct ib_recv_wr rx_wr, *rx_wr_fail; + struct ib_sge sge; + int ret; + + memset(&sge, 0, sizeof(struct ib_sge)); + sge.addr = isert_conn->login_req_dma; + sge.length = ISER_RX_LOGIN_SIZE; + sge.lkey = isert_conn->device->mr->lkey; + + isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n", + sge.addr, sge.length, sge.lkey); + + memset(&rx_wr, 0, sizeof(struct ib_recv_wr)); + rx_wr.wr_id = (uintptr_t)isert_conn->login_req_buf; + rx_wr.sg_list = &sge; + rx_wr.num_sge = 1; + + isert_conn->post_recv_buf_count++; + ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail); + if (ret) { + isert_err("ib_post_recv() failed: %d\n", ret); + isert_conn->post_recv_buf_count--; + } + + return ret; +} + +static int +isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login, + u32 length) +{ + struct isert_conn *isert_conn = conn->context; + struct isert_device *device = isert_conn->device; + struct ib_device *ib_dev = device->ib_device; + struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc; + int ret; + + isert_create_send_desc(isert_conn, NULL, tx_desc); + + memcpy(&tx_desc->iscsi_header, &login->rsp[0], + sizeof(struct iscsi_hdr)); + + isert_init_tx_hdrs(isert_conn, tx_desc); + + if (length > 0) { + struct ib_sge *tx_dsg = &tx_desc->tx_sg[1]; + + ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma, + length, DMA_TO_DEVICE); + + memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length); + + ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma, + length, DMA_TO_DEVICE); + + tx_dsg->addr = isert_conn->login_rsp_dma; + tx_dsg->length = length; + tx_dsg->lkey = isert_conn->device->mr->lkey; + tx_desc->num_sge = 2; + } + if (!login->login_failed) { + if (login->login_complete) { + if (!conn->sess->sess_ops->SessionType && + isert_conn->device->use_fastreg) { + ret = isert_conn_create_fastreg_pool(isert_conn); + if (ret) { + isert_err("Conn: %p failed to create" + " fastreg pool\n", isert_conn); + return ret; + } + } + + ret = isert_alloc_rx_descriptors(isert_conn); + if (ret) + return ret; + + ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX); + if (ret) + return ret; + + /* Now we are in FULL_FEATURE phase */ + mutex_lock(&isert_conn->mutex); + isert_conn->state = ISER_CONN_FULL_FEATURE; + mutex_unlock(&isert_conn->mutex); + goto post_send; + } + + ret = isert_rdma_post_recvl(isert_conn); + if (ret) + return ret; + } +post_send: + ret = isert_post_send(isert_conn, tx_desc); + if (ret) + return ret; + + return 0; +} + +static void +isert_rx_login_req(struct isert_conn *isert_conn) +{ + struct iser_rx_desc *rx_desc = (void *)isert_conn->login_req_buf; + int rx_buflen = isert_conn->login_req_len; + struct iscsi_conn *conn = isert_conn->conn; + struct iscsi_login *login = conn->conn_login; + int size; + + isert_info("conn %p\n", isert_conn); + + WARN_ON_ONCE(!login); + + if (login->first_request) { + struct iscsi_login_req *login_req = + (struct iscsi_login_req *)&rx_desc->iscsi_header; + /* + * Setup the initial iscsi_login values from the leading + * login request PDU. + */ + login->leading_connection = (!login_req->tsih) ? 1 : 0; + login->current_stage = + (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) + >> 2; + login->version_min = login_req->min_version; + login->version_max = login_req->max_version; + memcpy(login->isid, login_req->isid, 6); + login->cmd_sn = be32_to_cpu(login_req->cmdsn); + login->init_task_tag = login_req->itt; + login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn); + login->cid = be16_to_cpu(login_req->cid); + login->tsih = be16_to_cpu(login_req->tsih); + } + + memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN); + + size = min(rx_buflen, MAX_KEY_VALUE_PAIRS); + isert_dbg("Using login payload size: %d, rx_buflen: %d " + "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen, + MAX_KEY_VALUE_PAIRS); + memcpy(login->req_buf, &rx_desc->data[0], size); + + if (login->first_request) { + complete(&isert_conn->login_comp); + return; + } + schedule_delayed_work(&conn->login_work, 0); +} + +static struct iscsi_cmd +*isert_allocate_cmd(struct iscsi_conn *conn) +{ + struct isert_conn *isert_conn = conn->context; + struct isert_cmd *isert_cmd; + struct iscsi_cmd *cmd; + + cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); + if (!cmd) { + isert_err("Unable to allocate iscsi_cmd + isert_cmd\n"); + return NULL; + } + isert_cmd = iscsit_priv_cmd(cmd); + isert_cmd->conn = isert_conn; + isert_cmd->iscsi_cmd = cmd; + + return cmd; +} + +static int +isert_handle_scsi_cmd(struct isert_conn *isert_conn, + struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd, + struct iser_rx_desc *rx_desc, unsigned char *buf) +{ + struct iscsi_conn *conn = isert_conn->conn; + struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf; + struct scatterlist *sg; + int imm_data, imm_data_len, unsol_data, sg_nents, rc; + bool dump_payload = false; + + rc = iscsit_setup_scsi_cmd(conn, cmd, buf); + if (rc < 0) + return rc; + + imm_data = cmd->immediate_data; + imm_data_len = cmd->first_burst_len; + unsol_data = cmd->unsolicited_data; + + rc = iscsit_process_scsi_cmd(conn, cmd, hdr); + if (rc < 0) { + return 0; + } else if (rc > 0) { + dump_payload = true; + goto sequence_cmd; + } + + if (!imm_data) + return 0; + + sg = &cmd->se_cmd.t_data_sg[0]; + sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE)); + + isert_dbg("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n", + sg, sg_nents, &rx_desc->data[0], imm_data_len); + + sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len); + + cmd->write_data_done += imm_data_len; + + if (cmd->write_data_done == cmd->se_cmd.data_length) { + spin_lock_bh(&cmd->istate_lock); + cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; + cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; + spin_unlock_bh(&cmd->istate_lock); + } + +sequence_cmd: + rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); + + if (!rc && dump_payload == false && unsol_data) + iscsit_set_unsoliticed_dataout(cmd); + else if (dump_payload && imm_data) + target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); + + return 0; +} + +static int +isert_handle_iscsi_dataout(struct isert_conn *isert_conn, + struct iser_rx_desc *rx_desc, unsigned char *buf) +{ + struct scatterlist *sg_start; + struct iscsi_conn *conn = isert_conn->conn; + struct iscsi_cmd *cmd = NULL; + struct iscsi_data *hdr = (struct iscsi_data *)buf; + u32 unsol_data_len = ntoh24(hdr->dlength); + int rc, sg_nents, sg_off, page_off; + + rc = iscsit_check_dataout_hdr(conn, buf, &cmd); + if (rc < 0) + return rc; + else if (!cmd) + return 0; + /* + * FIXME: Unexpected unsolicited_data out + */ + if (!cmd->unsolicited_data) { + isert_err("Received unexpected solicited data payload\n"); + dump_stack(); + return -1; + } + + isert_dbg("Unsolicited DataOut unsol_data_len: %u, " + "write_data_done: %u, data_length: %u\n", + unsol_data_len, cmd->write_data_done, + cmd->se_cmd.data_length); + + sg_off = cmd->write_data_done / PAGE_SIZE; + sg_start = &cmd->se_cmd.t_data_sg[sg_off]; + sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE)); + page_off = cmd->write_data_done % PAGE_SIZE; + /* + * FIXME: Non page-aligned unsolicited_data out + */ + if (page_off) { + isert_err("unexpected non-page aligned data payload\n"); + dump_stack(); + return -1; + } + isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u " + "sg_nents: %u from %p %u\n", sg_start, sg_off, + sg_nents, &rx_desc->data[0], unsol_data_len); + + sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0], + unsol_data_len); + + rc = iscsit_check_dataout_payload(cmd, hdr, false); + if (rc < 0) + return rc; + + return 0; +} + +static int +isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, + struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc, + unsigned char *buf) +{ + struct iscsi_conn *conn = isert_conn->conn; + struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; + int rc; + + rc = iscsit_setup_nop_out(conn, cmd, hdr); + if (rc < 0) + return rc; + /* + * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload + */ + + return iscsit_process_nop_out(conn, cmd, hdr); +} + +static int +isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, + struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc, + struct iscsi_text *hdr) +{ + struct iscsi_conn *conn = isert_conn->conn; + u32 payload_length = ntoh24(hdr->dlength); + int rc; + unsigned char *text_in = NULL; + + rc = iscsit_setup_text_cmd(conn, cmd, hdr); + if (rc < 0) + return rc; + + if (payload_length) { + text_in = kzalloc(payload_length, GFP_KERNEL); + if (!text_in) { + isert_err("Unable to allocate text_in of payload_length: %u\n", + payload_length); + return -ENOMEM; + } + } + cmd->text_in_ptr = text_in; + + memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length); + + return iscsit_process_text_cmd(conn, cmd, hdr); +} + +static int +isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc, + uint32_t read_stag, uint64_t read_va, + uint32_t write_stag, uint64_t write_va) +{ + struct iscsi_hdr *hdr = &rx_desc->iscsi_header; + struct iscsi_conn *conn = isert_conn->conn; + struct iscsi_cmd *cmd; + struct isert_cmd *isert_cmd; + int ret = -EINVAL; + u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK); + + if (conn->sess->sess_ops->SessionType && + (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) { + isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery," + " ignoring\n", opcode); + return 0; + } + + switch (opcode) { + case ISCSI_OP_SCSI_CMD: + cmd = isert_allocate_cmd(conn); + if (!cmd) + break; + + isert_cmd = iscsit_priv_cmd(cmd); + isert_cmd->read_stag = read_stag; + isert_cmd->read_va = read_va; + isert_cmd->write_stag = write_stag; + isert_cmd->write_va = write_va; + + ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd, + rx_desc, (unsigned char *)hdr); + break; + case ISCSI_OP_NOOP_OUT: + cmd = isert_allocate_cmd(conn); + if (!cmd) + break; + + isert_cmd = iscsit_priv_cmd(cmd); + ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd, + rx_desc, (unsigned char *)hdr); + break; + case ISCSI_OP_SCSI_DATA_OUT: + ret = isert_handle_iscsi_dataout(isert_conn, rx_desc, + (unsigned char *)hdr); + break; + case ISCSI_OP_SCSI_TMFUNC: + cmd = isert_allocate_cmd(conn); + if (!cmd) + break; + + ret = iscsit_handle_task_mgt_cmd(conn, cmd, + (unsigned char *)hdr); + break; + case ISCSI_OP_LOGOUT: + cmd = isert_allocate_cmd(conn); + if (!cmd) + break; + + ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr); + break; + case ISCSI_OP_TEXT: + if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF) { + cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); + if (!cmd) + break; + } else { + cmd = isert_allocate_cmd(conn); + if (!cmd) + break; + } + + isert_cmd = iscsit_priv_cmd(cmd); + ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd, + rx_desc, (struct iscsi_text *)hdr); + break; + default: + isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode); + dump_stack(); + break; + } + + return ret; +} + +static void +isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn) +{ + struct iser_hdr *iser_hdr = &rx_desc->iser_header; + uint64_t read_va = 0, write_va = 0; + uint32_t read_stag = 0, write_stag = 0; + int rc; + + switch (iser_hdr->flags & 0xF0) { + case ISCSI_CTRL: + if (iser_hdr->flags & ISER_RSV) { + read_stag = be32_to_cpu(iser_hdr->read_stag); + read_va = be64_to_cpu(iser_hdr->read_va); + isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n", + read_stag, (unsigned long long)read_va); + } + if (iser_hdr->flags & ISER_WSV) { + write_stag = be32_to_cpu(iser_hdr->write_stag); + write_va = be64_to_cpu(iser_hdr->write_va); + isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n", + write_stag, (unsigned long long)write_va); + } + + isert_dbg("ISER ISCSI_CTRL PDU\n"); + break; + case ISER_HELLO: + isert_err("iSER Hello message\n"); + break; + default: + isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags); + break; + } + + rc = isert_rx_opcode(isert_conn, rx_desc, + read_stag, read_va, write_stag, write_va); +} + +static void +isert_rcv_completion(struct iser_rx_desc *desc, + struct isert_conn *isert_conn, + u32 xfer_len) +{ + struct ib_device *ib_dev = isert_conn->cm_id->device; + struct iscsi_hdr *hdr; + u64 rx_dma; + int rx_buflen, outstanding; + + if ((char *)desc == isert_conn->login_req_buf) { + rx_dma = isert_conn->login_req_dma; + rx_buflen = ISER_RX_LOGIN_SIZE; + isert_dbg("login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n", + rx_dma, rx_buflen); + } else { + rx_dma = desc->dma_addr; + rx_buflen = ISER_RX_PAYLOAD_SIZE; + isert_dbg("req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n", + rx_dma, rx_buflen); + } + + ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE); + + hdr = &desc->iscsi_header; + isert_dbg("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n", + hdr->opcode, hdr->itt, hdr->flags, + (int)(xfer_len - ISER_HEADERS_LEN)); + + if ((char *)desc == isert_conn->login_req_buf) { + isert_conn->login_req_len = xfer_len - ISER_HEADERS_LEN; + if (isert_conn->conn) { + struct iscsi_login *login = isert_conn->conn->conn_login; + + if (login && !login->first_request) + isert_rx_login_req(isert_conn); + } + mutex_lock(&isert_conn->mutex); + complete(&isert_conn->login_req_comp); + mutex_unlock(&isert_conn->mutex); + } else { + isert_rx_do_work(desc, isert_conn); + } + + ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen, + DMA_FROM_DEVICE); + + isert_conn->post_recv_buf_count--; + isert_dbg("Decremented post_recv_buf_count: %d\n", + isert_conn->post_recv_buf_count); + + if ((char *)desc == isert_conn->login_req_buf) + return; + + outstanding = isert_conn->post_recv_buf_count; + if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) { + int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding, + ISERT_MIN_POSTED_RX); + err = isert_post_recv(isert_conn, count); + if (err) { + isert_err("isert_post_recv() count: %d failed, %d\n", + count, err); + } + } +} + +static int +isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, + struct scatterlist *sg, u32 nents, u32 length, u32 offset, + enum iser_ib_op_code op, struct isert_data_buf *data) +{ + struct ib_device *ib_dev = isert_conn->cm_id->device; + + data->dma_dir = op == ISER_IB_RDMA_WRITE ? + DMA_TO_DEVICE : DMA_FROM_DEVICE; + + data->len = length - offset; + data->offset = offset; + data->sg_off = data->offset / PAGE_SIZE; + + data->sg = &sg[data->sg_off]; + data->nents = min_t(unsigned int, nents - data->sg_off, + ISCSI_ISER_SG_TABLESIZE); + data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE * + PAGE_SIZE); + + data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents, + data->dma_dir); + if (unlikely(!data->dma_nents)) { + isert_err("Cmd: unable to dma map SGs %p\n", sg); + return -EINVAL; + } + + isert_dbg("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n", + isert_cmd, data->dma_nents, data->sg, data->nents, data->len); + + return 0; +} + +static void +isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data) +{ + struct ib_device *ib_dev = isert_conn->cm_id->device; + + ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir); + memset(data, 0, sizeof(*data)); +} + + + +static void +isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn) +{ + struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; + + isert_dbg("Cmd %p\n", isert_cmd); + + if (wr->data.sg) { + isert_dbg("Cmd %p unmap_sg op\n", isert_cmd); + isert_unmap_data_buf(isert_conn, &wr->data); + } + + if (wr->send_wr) { + isert_dbg("Cmd %p free send_wr\n", isert_cmd); + kfree(wr->send_wr); + wr->send_wr = NULL; + } + + if (wr->ib_sge) { + isert_dbg("Cmd %p free ib_sge\n", isert_cmd); + kfree(wr->ib_sge); + wr->ib_sge = NULL; + } +} + +static void +isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn) +{ + struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; + + isert_dbg("Cmd %p\n", isert_cmd); + + if (wr->fr_desc) { + isert_dbg("Cmd %p free fr_desc %p\n", isert_cmd, wr->fr_desc); + if (wr->fr_desc->ind & ISERT_PROTECTED) { + isert_unmap_data_buf(isert_conn, &wr->prot); + wr->fr_desc->ind &= ~ISERT_PROTECTED; + } + spin_lock_bh(&isert_conn->pool_lock); + list_add_tail(&wr->fr_desc->list, &isert_conn->fr_pool); + spin_unlock_bh(&isert_conn->pool_lock); + wr->fr_desc = NULL; + } + + if (wr->data.sg) { + isert_dbg("Cmd %p unmap_sg op\n", isert_cmd); + isert_unmap_data_buf(isert_conn, &wr->data); + } + + wr->ib_sge = NULL; + wr->send_wr = NULL; +} + +static void +isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err) +{ + struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; + struct isert_conn *isert_conn = isert_cmd->conn; + struct iscsi_conn *conn = isert_conn->conn; + struct isert_device *device = isert_conn->device; + struct iscsi_text_rsp *hdr; + + isert_dbg("Cmd %p\n", isert_cmd); + + switch (cmd->iscsi_opcode) { + case ISCSI_OP_SCSI_CMD: + spin_lock_bh(&conn->cmd_lock); + if (!list_empty(&cmd->i_conn_node)) + list_del_init(&cmd->i_conn_node); + spin_unlock_bh(&conn->cmd_lock); + + if (cmd->data_direction == DMA_TO_DEVICE) { + iscsit_stop_dataout_timer(cmd); + /* + * Check for special case during comp_err where + * WRITE_PENDING has been handed off from core, + * but requires an extra target_put_sess_cmd() + * before transport_generic_free_cmd() below. + */ + if (comp_err && + cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) { + struct se_cmd *se_cmd = &cmd->se_cmd; + + target_put_sess_cmd(se_cmd->se_sess, se_cmd); + } + } + + device->unreg_rdma_mem(isert_cmd, isert_conn); + transport_generic_free_cmd(&cmd->se_cmd, 0); + break; + case ISCSI_OP_SCSI_TMFUNC: + spin_lock_bh(&conn->cmd_lock); + if (!list_empty(&cmd->i_conn_node)) + list_del_init(&cmd->i_conn_node); + spin_unlock_bh(&conn->cmd_lock); + + transport_generic_free_cmd(&cmd->se_cmd, 0); + break; + case ISCSI_OP_REJECT: + case ISCSI_OP_NOOP_OUT: + case ISCSI_OP_TEXT: + hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header; + /* If the continue bit is on, keep the command alive */ + if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE) + break; + + spin_lock_bh(&conn->cmd_lock); + if (!list_empty(&cmd->i_conn_node)) + list_del_init(&cmd->i_conn_node); + spin_unlock_bh(&conn->cmd_lock); + + /* + * Handle special case for REJECT when iscsi_add_reject*() has + * overwritten the original iscsi_opcode assignment, and the + * associated cmd->se_cmd needs to be released. + */ + if (cmd->se_cmd.se_tfo != NULL) { + isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n", + cmd->iscsi_opcode); + transport_generic_free_cmd(&cmd->se_cmd, 0); + break; + } + /* + * Fall-through + */ + default: + iscsit_release_cmd(cmd); + break; + } +} + +static void +isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev) +{ + if (tx_desc->dma_addr != 0) { + isert_dbg("unmap single for tx_desc->dma_addr\n"); + ib_dma_unmap_single(ib_dev, tx_desc->dma_addr, + ISER_HEADERS_LEN, DMA_TO_DEVICE); + tx_desc->dma_addr = 0; + } +} + +static void +isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd, + struct ib_device *ib_dev, bool comp_err) +{ + if (isert_cmd->pdu_buf_dma != 0) { + isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n"); + ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma, + isert_cmd->pdu_buf_len, DMA_TO_DEVICE); + isert_cmd->pdu_buf_dma = 0; + } + + isert_unmap_tx_desc(tx_desc, ib_dev); + isert_put_cmd(isert_cmd, comp_err); +} + +static int +isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr) +{ + struct ib_mr_status mr_status; + int ret; + + ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status); + if (ret) { + isert_err("ib_check_mr_status failed, ret %d\n", ret); + goto fail_mr_status; + } + + if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) { + u64 sec_offset_err; + u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8; + + switch (mr_status.sig_err.err_type) { + case IB_SIG_BAD_GUARD: + se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; + break; + case IB_SIG_BAD_REFTAG: + se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; + break; + case IB_SIG_BAD_APPTAG: + se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED; + break; + } + sec_offset_err = mr_status.sig_err.sig_err_offset; + do_div(sec_offset_err, block_size); + se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba; + + isert_err("PI error found type %d at sector 0x%llx " + "expected 0x%x vs actual 0x%x\n", + mr_status.sig_err.err_type, + (unsigned long long)se_cmd->bad_sector, + mr_status.sig_err.expected, + mr_status.sig_err.actual); + ret = 1; + } + +fail_mr_status: + return ret; +} + +static void +isert_completion_rdma_write(struct iser_tx_desc *tx_desc, + struct isert_cmd *isert_cmd) +{ + struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; + struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; + struct se_cmd *se_cmd = &cmd->se_cmd; + struct isert_conn *isert_conn = isert_cmd->conn; + struct isert_device *device = isert_conn->device; + int ret = 0; + + if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) { + ret = isert_check_pi_status(se_cmd, + wr->fr_desc->pi_ctx->sig_mr); + wr->fr_desc->ind &= ~ISERT_PROTECTED; + } + + device->unreg_rdma_mem(isert_cmd, isert_conn); + wr->send_wr_num = 0; + if (ret) + transport_send_check_condition_and_sense(se_cmd, + se_cmd->pi_err, 0); + else + isert_put_response(isert_conn->conn, cmd); +} + +static void +isert_completion_rdma_read(struct iser_tx_desc *tx_desc, + struct isert_cmd *isert_cmd) +{ + struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; + struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; + struct se_cmd *se_cmd = &cmd->se_cmd; + struct isert_conn *isert_conn = isert_cmd->conn; + struct isert_device *device = isert_conn->device; + int ret = 0; + + if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) { + ret = isert_check_pi_status(se_cmd, + wr->fr_desc->pi_ctx->sig_mr); + wr->fr_desc->ind &= ~ISERT_PROTECTED; + } + + iscsit_stop_dataout_timer(cmd); + device->unreg_rdma_mem(isert_cmd, isert_conn); + cmd->write_data_done = wr->data.len; + wr->send_wr_num = 0; + + isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd); + spin_lock_bh(&cmd->istate_lock); + cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; + cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; + spin_unlock_bh(&cmd->istate_lock); + + if (ret) { + target_put_sess_cmd(se_cmd->se_sess, se_cmd); + transport_send_check_condition_and_sense(se_cmd, + se_cmd->pi_err, 0); + } else { + target_execute_cmd(se_cmd); + } +} + +static void +isert_do_control_comp(struct work_struct *work) +{ + struct isert_cmd *isert_cmd = container_of(work, + struct isert_cmd, comp_work); + struct isert_conn *isert_conn = isert_cmd->conn; + struct ib_device *ib_dev = isert_conn->cm_id->device; + struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; + + isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state); + + switch (cmd->i_state) { + case ISTATE_SEND_TASKMGTRSP: + iscsit_tmr_post_handler(cmd, cmd->conn); + case ISTATE_SEND_REJECT: /* FALLTHRU */ + case ISTATE_SEND_TEXTRSP: /* FALLTHRU */ + cmd->i_state = ISTATE_SENT_STATUS; + isert_completion_put(&isert_cmd->tx_desc, isert_cmd, + ib_dev, false); + break; + case ISTATE_SEND_LOGOUTRSP: + iscsit_logout_post_handler(cmd, cmd->conn); + break; + default: + isert_err("Unknown i_state %d\n", cmd->i_state); + dump_stack(); + break; + } +} + +static void +isert_response_completion(struct iser_tx_desc *tx_desc, + struct isert_cmd *isert_cmd, + struct isert_conn *isert_conn, + struct ib_device *ib_dev) +{ + struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; + + if (cmd->i_state == ISTATE_SEND_TASKMGTRSP || + cmd->i_state == ISTATE_SEND_LOGOUTRSP || + cmd->i_state == ISTATE_SEND_REJECT || + cmd->i_state == ISTATE_SEND_TEXTRSP) { + isert_unmap_tx_desc(tx_desc, ib_dev); + + INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp); + queue_work(isert_comp_wq, &isert_cmd->comp_work); + return; + } + + cmd->i_state = ISTATE_SENT_STATUS; + isert_completion_put(tx_desc, isert_cmd, ib_dev, false); +} + +static void +isert_snd_completion(struct iser_tx_desc *tx_desc, + struct isert_conn *isert_conn) +{ + struct ib_device *ib_dev = isert_conn->cm_id->device; + struct isert_cmd *isert_cmd = tx_desc->isert_cmd; + struct isert_rdma_wr *wr; + + if (!isert_cmd) { + isert_unmap_tx_desc(tx_desc, ib_dev); + return; + } + wr = &isert_cmd->rdma_wr; + + isert_dbg("Cmd %p iser_ib_op %d\n", isert_cmd, wr->iser_ib_op); + + switch (wr->iser_ib_op) { + case ISER_IB_SEND: + isert_response_completion(tx_desc, isert_cmd, + isert_conn, ib_dev); + break; + case ISER_IB_RDMA_WRITE: + isert_completion_rdma_write(tx_desc, isert_cmd); + break; + case ISER_IB_RDMA_READ: + isert_completion_rdma_read(tx_desc, isert_cmd); + break; + default: + isert_err("Unknown wr->iser_ib_op: 0x%x\n", wr->iser_ib_op); + dump_stack(); + break; + } +} + +/** + * is_isert_tx_desc() - Indicate if the completion wr_id + * is a TX descriptor or not. + * @isert_conn: iser connection + * @wr_id: completion WR identifier + * + * Since we cannot rely on wc opcode in FLUSH errors + * we must work around it by checking if the wr_id address + * falls in the iser connection rx_descs buffer. If so + * it is an RX descriptor, otherwize it is a TX. + */ +static inline bool +is_isert_tx_desc(struct isert_conn *isert_conn, void *wr_id) +{ + void *start = isert_conn->rx_descs; + int len = ISERT_QP_MAX_RECV_DTOS * sizeof(*isert_conn->rx_descs); + + if (wr_id >= start && wr_id < start + len) + return false; + + return true; +} + +static void +isert_cq_comp_err(struct isert_conn *isert_conn, struct ib_wc *wc) +{ + if (wc->wr_id == ISER_BEACON_WRID) { + isert_info("conn %p completing wait_comp_err\n", + isert_conn); + complete(&isert_conn->wait_comp_err); + } else if (is_isert_tx_desc(isert_conn, (void *)(uintptr_t)wc->wr_id)) { + struct ib_device *ib_dev = isert_conn->cm_id->device; + struct isert_cmd *isert_cmd; + struct iser_tx_desc *desc; + + desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id; + isert_cmd = desc->isert_cmd; + if (!isert_cmd) + isert_unmap_tx_desc(desc, ib_dev); + else + isert_completion_put(desc, isert_cmd, ib_dev, true); + } else { + isert_conn->post_recv_buf_count--; + if (!isert_conn->post_recv_buf_count) + iscsit_cause_connection_reinstatement(isert_conn->conn, 0); + } +} + +static void +isert_handle_wc(struct ib_wc *wc) +{ + struct isert_conn *isert_conn; + struct iser_tx_desc *tx_desc; + struct iser_rx_desc *rx_desc; + + isert_conn = wc->qp->qp_context; + if (likely(wc->status == IB_WC_SUCCESS)) { + if (wc->opcode == IB_WC_RECV) { + rx_desc = (struct iser_rx_desc *)(uintptr_t)wc->wr_id; + isert_rcv_completion(rx_desc, isert_conn, wc->byte_len); + } else { + tx_desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id; + isert_snd_completion(tx_desc, isert_conn); + } + } else { + if (wc->status != IB_WC_WR_FLUSH_ERR) + isert_err("wr id %llx status %d vend_err %x\n", + wc->wr_id, wc->status, wc->vendor_err); + else + isert_dbg("flush error: wr id %llx\n", wc->wr_id); + + if (wc->wr_id != ISER_FASTREG_LI_WRID) + isert_cq_comp_err(isert_conn, wc); + } +} + +static void +isert_cq_work(struct work_struct *work) +{ + enum { isert_poll_budget = 65536 }; + struct isert_comp *comp = container_of(work, struct isert_comp, + work); + struct ib_wc *const wcs = comp->wcs; + int i, n, completed = 0; + + while ((n = ib_poll_cq(comp->cq, ARRAY_SIZE(comp->wcs), wcs)) > 0) { + for (i = 0; i < n; i++) + isert_handle_wc(&wcs[i]); + + completed += n; + if (completed >= isert_poll_budget) + break; + } + + ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP); +} + +static void +isert_cq_callback(struct ib_cq *cq, void *context) +{ + struct isert_comp *comp = context; + + queue_work(isert_comp_wq, &comp->work); +} + +static int +isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd) +{ + struct ib_send_wr *wr_failed; + int ret; + + ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr, + &wr_failed); + if (ret) { + isert_err("ib_post_send failed with %d\n", ret); + return ret; + } + return ret; +} + +static int +isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd) +{ + struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); + struct isert_conn *isert_conn = conn->context; + struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; + struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *) + &isert_cmd->tx_desc.iscsi_header; + + isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); + iscsit_build_rsp_pdu(cmd, conn, true, hdr); + isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); + /* + * Attach SENSE DATA payload to iSCSI Response PDU + */ + if (cmd->se_cmd.sense_buffer && + ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || + (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { + struct isert_device *device = isert_conn->device; + struct ib_device *ib_dev = device->ib_device; + struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1]; + u32 padding, pdu_len; + + put_unaligned_be16(cmd->se_cmd.scsi_sense_length, + cmd->sense_buffer); + cmd->se_cmd.scsi_sense_length += sizeof(__be16); + + padding = -(cmd->se_cmd.scsi_sense_length) & 3; + hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); + pdu_len = cmd->se_cmd.scsi_sense_length + padding; + + isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev, + (void *)cmd->sense_buffer, pdu_len, + DMA_TO_DEVICE); + + isert_cmd->pdu_buf_len = pdu_len; + tx_dsg->addr = isert_cmd->pdu_buf_dma; + tx_dsg->length = pdu_len; + tx_dsg->lkey = device->mr->lkey; + isert_cmd->tx_desc.num_sge = 2; + } + + isert_init_send_wr(isert_conn, isert_cmd, send_wr); + + isert_dbg("Posting SCSI Response\n"); + + return isert_post_response(isert_conn, isert_cmd); +} + +static void +isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd) +{ + struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); + struct isert_conn *isert_conn = conn->context; + struct isert_device *device = isert_conn->device; + + spin_lock_bh(&conn->cmd_lock); + if (!list_empty(&cmd->i_conn_node)) + list_del_init(&cmd->i_conn_node); + spin_unlock_bh(&conn->cmd_lock); + + if (cmd->data_direction == DMA_TO_DEVICE) + iscsit_stop_dataout_timer(cmd); + + device->unreg_rdma_mem(isert_cmd, isert_conn); +} + +static enum target_prot_op +isert_get_sup_prot_ops(struct iscsi_conn *conn) +{ + struct isert_conn *isert_conn = conn->context; + struct isert_device *device = isert_conn->device; + + if (conn->tpg->tpg_attrib.t10_pi) { + if (device->pi_capable) { + isert_info("conn %p PI offload enabled\n", isert_conn); + isert_conn->pi_support = true; + return TARGET_PROT_ALL; + } + } + + isert_info("conn %p PI offload disabled\n", isert_conn); + isert_conn->pi_support = false; + + return TARGET_PROT_NORMAL; +} + +static int +isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn, + bool nopout_response) +{ + struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); + struct isert_conn *isert_conn = conn->context; + struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; + + isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); + iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *) + &isert_cmd->tx_desc.iscsi_header, + nopout_response); + isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); + isert_init_send_wr(isert_conn, isert_cmd, send_wr); + + isert_dbg("conn %p Posting NOPIN Response\n", isert_conn); + + return isert_post_response(isert_conn, isert_cmd); +} + +static int +isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) +{ + struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); + struct isert_conn *isert_conn = conn->context; + struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; + + isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); + iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *) + &isert_cmd->tx_desc.iscsi_header); + isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); + isert_init_send_wr(isert_conn, isert_cmd, send_wr); + + isert_dbg("conn %p Posting Logout Response\n", isert_conn); + + return isert_post_response(isert_conn, isert_cmd); +} + +static int +isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) +{ + struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); + struct isert_conn *isert_conn = conn->context; + struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; + + isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); + iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *) + &isert_cmd->tx_desc.iscsi_header); + isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); + isert_init_send_wr(isert_conn, isert_cmd, send_wr); + + isert_dbg("conn %p Posting Task Management Response\n", isert_conn); + + return isert_post_response(isert_conn, isert_cmd); +} + +static int +isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn) +{ + struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); + struct isert_conn *isert_conn = conn->context; + struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; + struct isert_device *device = isert_conn->device; + struct ib_device *ib_dev = device->ib_device; + struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1]; + struct iscsi_reject *hdr = + (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header; + + isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); + iscsit_build_reject(cmd, conn, hdr); + isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); + + hton24(hdr->dlength, ISCSI_HDR_LEN); + isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev, + (void *)cmd->buf_ptr, ISCSI_HDR_LEN, + DMA_TO_DEVICE); + isert_cmd->pdu_buf_len = ISCSI_HDR_LEN; + tx_dsg->addr = isert_cmd->pdu_buf_dma; + tx_dsg->length = ISCSI_HDR_LEN; + tx_dsg->lkey = device->mr->lkey; + isert_cmd->tx_desc.num_sge = 2; + + isert_init_send_wr(isert_conn, isert_cmd, send_wr); + + isert_dbg("conn %p Posting Reject\n", isert_conn); + + return isert_post_response(isert_conn, isert_cmd); +} + +static int +isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) +{ + struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); + struct isert_conn *isert_conn = conn->context; + struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; + struct iscsi_text_rsp *hdr = + (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header; + u32 txt_rsp_len; + int rc; + + isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); + rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND); + if (rc < 0) + return rc; + + txt_rsp_len = rc; + isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); + + if (txt_rsp_len) { + struct isert_device *device = isert_conn->device; + struct ib_device *ib_dev = device->ib_device; + struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1]; + void *txt_rsp_buf = cmd->buf_ptr; + + isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev, + txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE); + + isert_cmd->pdu_buf_len = txt_rsp_len; + tx_dsg->addr = isert_cmd->pdu_buf_dma; + tx_dsg->length = txt_rsp_len; + tx_dsg->lkey = device->mr->lkey; + isert_cmd->tx_desc.num_sge = 2; + } + isert_init_send_wr(isert_conn, isert_cmd, send_wr); + + isert_dbg("conn %p Text Response\n", isert_conn); + + return isert_post_response(isert_conn, isert_cmd); +} + +static int +isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, + struct ib_sge *ib_sge, struct ib_send_wr *send_wr, + u32 data_left, u32 offset) +{ + struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; + struct scatterlist *sg_start, *tmp_sg; + struct isert_device *device = isert_conn->device; + struct ib_device *ib_dev = device->ib_device; + u32 sg_off, page_off; + int i = 0, sg_nents; + + sg_off = offset / PAGE_SIZE; + sg_start = &cmd->se_cmd.t_data_sg[sg_off]; + sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge); + page_off = offset % PAGE_SIZE; + + send_wr->sg_list = ib_sge; + send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc; + /* + * Perform mapping of TCM scatterlist memory ib_sge dma_addr. + */ + for_each_sg(sg_start, tmp_sg, sg_nents, i) { + isert_dbg("RDMA from SGL dma_addr: 0x%llx dma_len: %u, " + "page_off: %u\n", + (unsigned long long)tmp_sg->dma_address, + tmp_sg->length, page_off); + + ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off; + ib_sge->length = min_t(u32, data_left, + ib_sg_dma_len(ib_dev, tmp_sg) - page_off); + ib_sge->lkey = device->mr->lkey; + + isert_dbg("RDMA ib_sge: addr: 0x%llx length: %u lkey: %x\n", + ib_sge->addr, ib_sge->length, ib_sge->lkey); + page_off = 0; + data_left -= ib_sge->length; + if (!data_left) + break; + ib_sge++; + isert_dbg("Incrementing ib_sge pointer to %p\n", ib_sge); + } + + send_wr->num_sge = ++i; + isert_dbg("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n", + send_wr->sg_list, send_wr->num_sge); + + return send_wr->num_sge; +} + +static int +isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd, + struct isert_rdma_wr *wr) +{ + struct se_cmd *se_cmd = &cmd->se_cmd; + struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); + struct isert_conn *isert_conn = conn->context; + struct isert_data_buf *data = &wr->data; + struct ib_send_wr *send_wr; + struct ib_sge *ib_sge; + u32 offset, data_len, data_left, rdma_write_max, va_offset = 0; + int ret = 0, i, ib_sge_cnt; + + isert_cmd->tx_desc.isert_cmd = isert_cmd; + + offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0; + ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg, + se_cmd->t_data_nents, se_cmd->data_length, + offset, wr->iser_ib_op, &wr->data); + if (ret) + return ret; + + data_left = data->len; + offset = data->offset; + + ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL); + if (!ib_sge) { + isert_warn("Unable to allocate ib_sge\n"); + ret = -ENOMEM; + goto unmap_cmd; + } + wr->ib_sge = ib_sge; + + wr->send_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge); + wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num, + GFP_KERNEL); + if (!wr->send_wr) { + isert_dbg("Unable to allocate wr->send_wr\n"); + ret = -ENOMEM; + goto unmap_cmd; + } + + wr->isert_cmd = isert_cmd; + rdma_write_max = isert_conn->max_sge * PAGE_SIZE; + + for (i = 0; i < wr->send_wr_num; i++) { + send_wr = &isert_cmd->rdma_wr.send_wr[i]; + data_len = min(data_left, rdma_write_max); + + send_wr->send_flags = 0; + if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) { + send_wr->opcode = IB_WR_RDMA_WRITE; + send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset; + send_wr->wr.rdma.rkey = isert_cmd->read_stag; + if (i + 1 == wr->send_wr_num) + send_wr->next = &isert_cmd->tx_desc.send_wr; + else + send_wr->next = &wr->send_wr[i + 1]; + } else { + send_wr->opcode = IB_WR_RDMA_READ; + send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset; + send_wr->wr.rdma.rkey = isert_cmd->write_stag; + if (i + 1 == wr->send_wr_num) + send_wr->send_flags = IB_SEND_SIGNALED; + else + send_wr->next = &wr->send_wr[i + 1]; + } + + ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge, + send_wr, data_len, offset); + ib_sge += ib_sge_cnt; + + offset += data_len; + va_offset += data_len; + data_left -= data_len; + } + + return 0; +unmap_cmd: + isert_unmap_data_buf(isert_conn, data); + + return ret; +} + +static int +isert_map_fr_pagelist(struct ib_device *ib_dev, + struct scatterlist *sg_start, int sg_nents, u64 *fr_pl) +{ + u64 start_addr, end_addr, page, chunk_start = 0; + struct scatterlist *tmp_sg; + int i = 0, new_chunk, last_ent, n_pages; + + n_pages = 0; + new_chunk = 1; + last_ent = sg_nents - 1; + for_each_sg(sg_start, tmp_sg, sg_nents, i) { + start_addr = ib_sg_dma_address(ib_dev, tmp_sg); + if (new_chunk) + chunk_start = start_addr; + end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg); + + isert_dbg("SGL[%d] dma_addr: 0x%llx len: %u\n", + i, (unsigned long long)tmp_sg->dma_address, + tmp_sg->length); + + if ((end_addr & ~PAGE_MASK) && i < last_ent) { + new_chunk = 0; + continue; + } + new_chunk = 1; + + page = chunk_start & PAGE_MASK; + do { + fr_pl[n_pages++] = page; + isert_dbg("Mapped page_list[%d] page_addr: 0x%llx\n", + n_pages - 1, page); + page += PAGE_SIZE; + } while (page < end_addr); + } + + return n_pages; +} + +static inline void +isert_inv_rkey(struct ib_send_wr *inv_wr, struct ib_mr *mr) +{ + u32 rkey; + + memset(inv_wr, 0, sizeof(*inv_wr)); + inv_wr->wr_id = ISER_FASTREG_LI_WRID; + inv_wr->opcode = IB_WR_LOCAL_INV; + inv_wr->ex.invalidate_rkey = mr->rkey; + + /* Bump the key */ + rkey = ib_inc_rkey(mr->rkey); + ib_update_fast_reg_key(mr, rkey); +} + +static int +isert_fast_reg_mr(struct isert_conn *isert_conn, + struct fast_reg_descriptor *fr_desc, + struct isert_data_buf *mem, + enum isert_indicator ind, + struct ib_sge *sge) +{ + struct isert_device *device = isert_conn->device; + struct ib_device *ib_dev = device->ib_device; + struct ib_mr *mr; + struct ib_fast_reg_page_list *frpl; + struct ib_send_wr fr_wr, inv_wr; + struct ib_send_wr *bad_wr, *wr = NULL; + int ret, pagelist_len; + u32 page_off; + + if (mem->dma_nents == 1) { + sge->lkey = device->mr->lkey; + sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]); + sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]); + isert_dbg("sge: addr: 0x%llx length: %u lkey: %x\n", + sge->addr, sge->length, sge->lkey); + return 0; + } + + if (ind == ISERT_DATA_KEY_VALID) { + /* Registering data buffer */ + mr = fr_desc->data_mr; + frpl = fr_desc->data_frpl; + } else { + /* Registering protection buffer */ + mr = fr_desc->pi_ctx->prot_mr; + frpl = fr_desc->pi_ctx->prot_frpl; + } + + page_off = mem->offset % PAGE_SIZE; + + isert_dbg("Use fr_desc %p sg_nents %d offset %u\n", + fr_desc, mem->nents, mem->offset); + + pagelist_len = isert_map_fr_pagelist(ib_dev, mem->sg, mem->nents, + &frpl->page_list[0]); + + if (!(fr_desc->ind & ind)) { + isert_inv_rkey(&inv_wr, mr); + wr = &inv_wr; + } + + /* Prepare FASTREG WR */ + memset(&fr_wr, 0, sizeof(fr_wr)); + fr_wr.wr_id = ISER_FASTREG_LI_WRID; + fr_wr.opcode = IB_WR_FAST_REG_MR; + fr_wr.wr.fast_reg.iova_start = frpl->page_list[0] + page_off; + fr_wr.wr.fast_reg.page_list = frpl; + fr_wr.wr.fast_reg.page_list_len = pagelist_len; + fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT; + fr_wr.wr.fast_reg.length = mem->len; + fr_wr.wr.fast_reg.rkey = mr->rkey; + fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE; + + if (!wr) + wr = &fr_wr; + else + wr->next = &fr_wr; + + ret = ib_post_send(isert_conn->qp, wr, &bad_wr); + if (ret) { + isert_err("fast registration failed, ret:%d\n", ret); + return ret; + } + fr_desc->ind &= ~ind; + + sge->lkey = mr->lkey; + sge->addr = frpl->page_list[0] + page_off; + sge->length = mem->len; + + isert_dbg("sge: addr: 0x%llx length: %u lkey: %x\n", + sge->addr, sge->length, sge->lkey); + + return ret; +} + +static inline void +isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs, + struct ib_sig_domain *domain) +{ + domain->sig_type = IB_SIG_TYPE_T10_DIF; + domain->sig.dif.bg_type = IB_T10DIF_CRC; + domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size; + domain->sig.dif.ref_tag = se_cmd->reftag_seed; + /* + * At the moment we hard code those, but if in the future + * the target core would like to use it, we will take it + * from se_cmd. + */ + domain->sig.dif.apptag_check_mask = 0xffff; + domain->sig.dif.app_escape = true; + domain->sig.dif.ref_escape = true; + if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT || + se_cmd->prot_type == TARGET_DIF_TYPE2_PROT) + domain->sig.dif.ref_remap = true; +}; + +static int +isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs) +{ + switch (se_cmd->prot_op) { + case TARGET_PROT_DIN_INSERT: + case TARGET_PROT_DOUT_STRIP: + sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE; + isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire); + break; + case TARGET_PROT_DOUT_INSERT: + case TARGET_PROT_DIN_STRIP: + sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE; + isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem); + break; + case TARGET_PROT_DIN_PASS: + case TARGET_PROT_DOUT_PASS: + isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire); + isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem); + break; + default: + isert_err("Unsupported PI operation %d\n", se_cmd->prot_op); + return -EINVAL; + } + + return 0; +} + +static inline u8 +isert_set_prot_checks(u8 prot_checks) +{ + return (prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) | + (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) | + (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0); +} + +static int +isert_reg_sig_mr(struct isert_conn *isert_conn, + struct se_cmd *se_cmd, + struct isert_rdma_wr *rdma_wr, + struct fast_reg_descriptor *fr_desc) +{ + struct ib_send_wr sig_wr, inv_wr; + struct ib_send_wr *bad_wr, *wr = NULL; + struct pi_context *pi_ctx = fr_desc->pi_ctx; + struct ib_sig_attrs sig_attrs; + int ret; + + memset(&sig_attrs, 0, sizeof(sig_attrs)); + ret = isert_set_sig_attrs(se_cmd, &sig_attrs); + if (ret) + goto err; + + sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks); + + if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) { + isert_inv_rkey(&inv_wr, pi_ctx->sig_mr); + wr = &inv_wr; + } + + memset(&sig_wr, 0, sizeof(sig_wr)); + sig_wr.opcode = IB_WR_REG_SIG_MR; + sig_wr.wr_id = ISER_FASTREG_LI_WRID; + sig_wr.sg_list = &rdma_wr->ib_sg[DATA]; + sig_wr.num_sge = 1; + sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE; + sig_wr.wr.sig_handover.sig_attrs = &sig_attrs; + sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr; + if (se_cmd->t_prot_sg) + sig_wr.wr.sig_handover.prot = &rdma_wr->ib_sg[PROT]; + + if (!wr) + wr = &sig_wr; + else + wr->next = &sig_wr; + + ret = ib_post_send(isert_conn->qp, wr, &bad_wr); + if (ret) { + isert_err("fast registration failed, ret:%d\n", ret); + goto err; + } + fr_desc->ind &= ~ISERT_SIG_KEY_VALID; + + rdma_wr->ib_sg[SIG].lkey = pi_ctx->sig_mr->lkey; + rdma_wr->ib_sg[SIG].addr = 0; + rdma_wr->ib_sg[SIG].length = se_cmd->data_length; + if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP && + se_cmd->prot_op != TARGET_PROT_DOUT_INSERT) + /* + * We have protection guards on the wire + * so we need to set a larget transfer + */ + rdma_wr->ib_sg[SIG].length += se_cmd->prot_length; + + isert_dbg("sig_sge: addr: 0x%llx length: %u lkey: %x\n", + rdma_wr->ib_sg[SIG].addr, rdma_wr->ib_sg[SIG].length, + rdma_wr->ib_sg[SIG].lkey); +err: + return ret; +} + +static int +isert_handle_prot_cmd(struct isert_conn *isert_conn, + struct isert_cmd *isert_cmd, + struct isert_rdma_wr *wr) +{ + struct isert_device *device = isert_conn->device; + struct se_cmd *se_cmd = &isert_cmd->iscsi_cmd->se_cmd; + int ret; + + if (!wr->fr_desc->pi_ctx) { + ret = isert_create_pi_ctx(wr->fr_desc, + device->ib_device, + device->pd); + if (ret) { + isert_err("conn %p failed to allocate pi_ctx\n", + isert_conn); + return ret; + } + } + + if (se_cmd->t_prot_sg) { + ret = isert_map_data_buf(isert_conn, isert_cmd, + se_cmd->t_prot_sg, + se_cmd->t_prot_nents, + se_cmd->prot_length, + 0, wr->iser_ib_op, &wr->prot); + if (ret) { + isert_err("conn %p failed to map protection buffer\n", + isert_conn); + return ret; + } + + memset(&wr->ib_sg[PROT], 0, sizeof(wr->ib_sg[PROT])); + ret = isert_fast_reg_mr(isert_conn, wr->fr_desc, &wr->prot, + ISERT_PROT_KEY_VALID, &wr->ib_sg[PROT]); + if (ret) { + isert_err("conn %p failed to fast reg mr\n", + isert_conn); + goto unmap_prot_cmd; + } + } + + ret = isert_reg_sig_mr(isert_conn, se_cmd, wr, wr->fr_desc); + if (ret) { + isert_err("conn %p failed to fast reg mr\n", + isert_conn); + goto unmap_prot_cmd; + } + wr->fr_desc->ind |= ISERT_PROTECTED; + + return 0; + +unmap_prot_cmd: + if (se_cmd->t_prot_sg) + isert_unmap_data_buf(isert_conn, &wr->prot); + + return ret; +} + +static int +isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd, + struct isert_rdma_wr *wr) +{ + struct se_cmd *se_cmd = &cmd->se_cmd; + struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); + struct isert_conn *isert_conn = conn->context; + struct fast_reg_descriptor *fr_desc = NULL; + struct ib_send_wr *send_wr; + struct ib_sge *ib_sg; + u32 offset; + int ret = 0; + unsigned long flags; + + isert_cmd->tx_desc.isert_cmd = isert_cmd; + + offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0; + ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg, + se_cmd->t_data_nents, se_cmd->data_length, + offset, wr->iser_ib_op, &wr->data); + if (ret) + return ret; + + if (wr->data.dma_nents != 1 || isert_prot_cmd(isert_conn, se_cmd)) { + spin_lock_irqsave(&isert_conn->pool_lock, flags); + fr_desc = list_first_entry(&isert_conn->fr_pool, + struct fast_reg_descriptor, list); + list_del(&fr_desc->list); + spin_unlock_irqrestore(&isert_conn->pool_lock, flags); + wr->fr_desc = fr_desc; + } + + ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data, + ISERT_DATA_KEY_VALID, &wr->ib_sg[DATA]); + if (ret) + goto unmap_cmd; + + if (isert_prot_cmd(isert_conn, se_cmd)) { + ret = isert_handle_prot_cmd(isert_conn, isert_cmd, wr); + if (ret) + goto unmap_cmd; + + ib_sg = &wr->ib_sg[SIG]; + } else { + ib_sg = &wr->ib_sg[DATA]; + } + + memcpy(&wr->s_ib_sge, ib_sg, sizeof(*ib_sg)); + wr->ib_sge = &wr->s_ib_sge; + wr->send_wr_num = 1; + memset(&wr->s_send_wr, 0, sizeof(*send_wr)); + wr->send_wr = &wr->s_send_wr; + wr->isert_cmd = isert_cmd; + + send_wr = &isert_cmd->rdma_wr.s_send_wr; + send_wr->sg_list = &wr->s_ib_sge; + send_wr->num_sge = 1; + send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc; + if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) { + send_wr->opcode = IB_WR_RDMA_WRITE; + send_wr->wr.rdma.remote_addr = isert_cmd->read_va; + send_wr->wr.rdma.rkey = isert_cmd->read_stag; + send_wr->send_flags = !isert_prot_cmd(isert_conn, se_cmd) ? + 0 : IB_SEND_SIGNALED; + } else { + send_wr->opcode = IB_WR_RDMA_READ; + send_wr->wr.rdma.remote_addr = isert_cmd->write_va; + send_wr->wr.rdma.rkey = isert_cmd->write_stag; + send_wr->send_flags = IB_SEND_SIGNALED; + } + + return 0; + +unmap_cmd: + if (fr_desc) { + spin_lock_irqsave(&isert_conn->pool_lock, flags); + list_add_tail(&fr_desc->list, &isert_conn->fr_pool); + spin_unlock_irqrestore(&isert_conn->pool_lock, flags); + } + isert_unmap_data_buf(isert_conn, &wr->data); + + return ret; +} + +static int +isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd) +{ + struct se_cmd *se_cmd = &cmd->se_cmd; + struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); + struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; + struct isert_conn *isert_conn = conn->context; + struct isert_device *device = isert_conn->device; + struct ib_send_wr *wr_failed; + int rc; + + isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n", + isert_cmd, se_cmd->data_length); + + wr->iser_ib_op = ISER_IB_RDMA_WRITE; + rc = device->reg_rdma_mem(conn, cmd, wr); + if (rc) { + isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd); + return rc; + } + + if (!isert_prot_cmd(isert_conn, se_cmd)) { + /* + * Build isert_conn->tx_desc for iSCSI response PDU and attach + */ + isert_create_send_desc(isert_conn, isert_cmd, + &isert_cmd->tx_desc); + iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *) + &isert_cmd->tx_desc.iscsi_header); + isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); + isert_init_send_wr(isert_conn, isert_cmd, + &isert_cmd->tx_desc.send_wr); + isert_cmd->rdma_wr.s_send_wr.next = &isert_cmd->tx_desc.send_wr; + wr->send_wr_num += 1; + } + + rc = ib_post_send(isert_conn->qp, wr->send_wr, &wr_failed); + if (rc) + isert_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n"); + + if (!isert_prot_cmd(isert_conn, se_cmd)) + isert_dbg("Cmd: %p posted RDMA_WRITE + Response for iSER Data " + "READ\n", isert_cmd); + else + isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n", + isert_cmd); + + return 1; +} + +static int +isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery) +{ + struct se_cmd *se_cmd = &cmd->se_cmd; + struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); + struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; + struct isert_conn *isert_conn = conn->context; + struct isert_device *device = isert_conn->device; + struct ib_send_wr *wr_failed; + int rc; + + isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n", + isert_cmd, se_cmd->data_length, cmd->write_data_done); + wr->iser_ib_op = ISER_IB_RDMA_READ; + rc = device->reg_rdma_mem(conn, cmd, wr); + if (rc) { + isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd); + return rc; + } + + rc = ib_post_send(isert_conn->qp, wr->send_wr, &wr_failed); + if (rc) + isert_warn("ib_post_send() failed for IB_WR_RDMA_READ\n"); + + isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n", + isert_cmd); + + return 0; +} + +static int +isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) +{ + int ret; + + switch (state) { + case ISTATE_SEND_NOPIN_WANT_RESPONSE: + ret = isert_put_nopin(cmd, conn, false); + break; + default: + isert_err("Unknown immediate state: 0x%02x\n", state); + ret = -EINVAL; + break; + } + + return ret; +} + +static int +isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) +{ + struct isert_conn *isert_conn = conn->context; + int ret; + + switch (state) { + case ISTATE_SEND_LOGOUTRSP: + ret = isert_put_logout_rsp(cmd, conn); + if (!ret) + isert_conn->logout_posted = true; + break; + case ISTATE_SEND_NOPIN: + ret = isert_put_nopin(cmd, conn, true); + break; + case ISTATE_SEND_TASKMGTRSP: + ret = isert_put_tm_rsp(cmd, conn); + break; + case ISTATE_SEND_REJECT: + ret = isert_put_reject(cmd, conn); + break; + case ISTATE_SEND_TEXTRSP: + ret = isert_put_text_rsp(cmd, conn); + break; + case ISTATE_SEND_STATUS: + /* + * Special case for sending non GOOD SCSI status from TX thread + * context during pre se_cmd excecution failure. + */ + ret = isert_put_response(conn, cmd); + break; + default: + isert_err("Unknown response state: 0x%02x\n", state); + ret = -EINVAL; + break; + } + + return ret; +} + +struct rdma_cm_id * +isert_setup_id(struct isert_np *isert_np) +{ + struct iscsi_np *np = isert_np->np; + struct rdma_cm_id *id; + struct sockaddr *sa; + int ret; + + sa = (struct sockaddr *)&np->np_sockaddr; + isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa); + + id = rdma_create_id(isert_cma_handler, isert_np, + RDMA_PS_TCP, IB_QPT_RC); + if (IS_ERR(id)) { + isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id)); + ret = PTR_ERR(id); + goto out; + } + isert_dbg("id %p context %p\n", id, id->context); + + ret = rdma_bind_addr(id, sa); + if (ret) { + isert_err("rdma_bind_addr() failed: %d\n", ret); + goto out_id; + } + + ret = rdma_listen(id, 0); + if (ret) { + isert_err("rdma_listen() failed: %d\n", ret); + goto out_id; + } + + return id; +out_id: + rdma_destroy_id(id); +out: + return ERR_PTR(ret); +} + +static int +isert_setup_np(struct iscsi_np *np, + struct __kernel_sockaddr_storage *ksockaddr) +{ + struct isert_np *isert_np; + struct rdma_cm_id *isert_lid; + int ret; + + isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL); + if (!isert_np) { + isert_err("Unable to allocate struct isert_np\n"); + return -ENOMEM; + } + sema_init(&isert_np->np_sem, 0); + mutex_init(&isert_np->np_accept_mutex); + INIT_LIST_HEAD(&isert_np->np_accept_list); + init_completion(&isert_np->np_login_comp); + isert_np->np = np; + + /* + * Setup the np->np_sockaddr from the passed sockaddr setup + * in iscsi_target_configfs.c code.. + */ + memcpy(&np->np_sockaddr, ksockaddr, + sizeof(struct __kernel_sockaddr_storage)); + + isert_lid = isert_setup_id(isert_np); + if (IS_ERR(isert_lid)) { + ret = PTR_ERR(isert_lid); + goto out; + } + + isert_np->np_cm_id = isert_lid; + np->np_context = isert_np; + + return 0; + +out: + kfree(isert_np); + + return ret; +} + +static int +isert_rdma_accept(struct isert_conn *isert_conn) +{ + struct rdma_cm_id *cm_id = isert_conn->cm_id; + struct rdma_conn_param cp; + int ret; + + memset(&cp, 0, sizeof(struct rdma_conn_param)); + cp.initiator_depth = isert_conn->initiator_depth; + cp.retry_count = 7; + cp.rnr_retry_count = 7; + + ret = rdma_accept(cm_id, &cp); + if (ret) { + isert_err("rdma_accept() failed with: %d\n", ret); + return ret; + } + + return 0; +} + +static int +isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login) +{ + struct isert_conn *isert_conn = conn->context; + int ret; + + isert_info("before login_req comp conn: %p\n", isert_conn); + ret = wait_for_completion_interruptible(&isert_conn->login_req_comp); + if (ret) { + isert_err("isert_conn %p interrupted before got login req\n", + isert_conn); + return ret; + } + reinit_completion(&isert_conn->login_req_comp); + + /* + * For login requests after the first PDU, isert_rx_login_req() will + * kick schedule_delayed_work(&conn->login_work) as the packet is + * received, which turns this callback from iscsi_target_do_login_rx() + * into a NOP. + */ + if (!login->first_request) + return 0; + + isert_rx_login_req(isert_conn); + + isert_info("before login_comp conn: %p\n", conn); + ret = wait_for_completion_interruptible(&isert_conn->login_comp); + if (ret) + return ret; + + isert_info("processing login->req: %p\n", login->req); + + return 0; +} + +static void +isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn, + struct isert_conn *isert_conn) +{ + struct rdma_cm_id *cm_id = isert_conn->cm_id; + struct rdma_route *cm_route = &cm_id->route; + struct sockaddr_in *sock_in; + struct sockaddr_in6 *sock_in6; + + conn->login_family = np->np_sockaddr.ss_family; + + if (np->np_sockaddr.ss_family == AF_INET6) { + sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr; + snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c", + &sock_in6->sin6_addr.in6_u); + conn->login_port = ntohs(sock_in6->sin6_port); + + sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr; + snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c", + &sock_in6->sin6_addr.in6_u); + conn->local_port = ntohs(sock_in6->sin6_port); + } else { + sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr; + sprintf(conn->login_ip, "%pI4", + &sock_in->sin_addr.s_addr); + conn->login_port = ntohs(sock_in->sin_port); + + sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr; + sprintf(conn->local_ip, "%pI4", + &sock_in->sin_addr.s_addr); + conn->local_port = ntohs(sock_in->sin_port); + } +} + +static int +isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn) +{ + struct isert_np *isert_np = np->np_context; + struct isert_conn *isert_conn; + int ret; + +accept_wait: + ret = down_interruptible(&isert_np->np_sem); + if (ret) + return -ENODEV; + + spin_lock_bh(&np->np_thread_lock); + if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) { + spin_unlock_bh(&np->np_thread_lock); + isert_dbg("np_thread_state %d\n", + np->np_thread_state); + /** + * No point in stalling here when np_thread + * is in state RESET/SHUTDOWN/EXIT - bail + **/ + return -ENODEV; + } + spin_unlock_bh(&np->np_thread_lock); + + mutex_lock(&isert_np->np_accept_mutex); + if (list_empty(&isert_np->np_accept_list)) { + mutex_unlock(&isert_np->np_accept_mutex); + goto accept_wait; + } + isert_conn = list_first_entry(&isert_np->np_accept_list, + struct isert_conn, accept_node); + list_del_init(&isert_conn->accept_node); + mutex_unlock(&isert_np->np_accept_mutex); + + conn->context = isert_conn; + isert_conn->conn = conn; + + isert_set_conn_info(np, conn, isert_conn); + + isert_dbg("Processing isert_conn: %p\n", isert_conn); + + return 0; +} + +static void +isert_free_np(struct iscsi_np *np) +{ + struct isert_np *isert_np = np->np_context; + struct isert_conn *isert_conn, *n; + + if (isert_np->np_cm_id) + rdma_destroy_id(isert_np->np_cm_id); + + /* + * FIXME: At this point we don't have a good way to insure + * that at this point we don't have hanging connections that + * completed RDMA establishment but didn't start iscsi login + * process. So work-around this by cleaning up what ever piled + * up in np_accept_list. + */ + mutex_lock(&isert_np->np_accept_mutex); + if (!list_empty(&isert_np->np_accept_list)) { + isert_info("Still have isert connections, cleaning up...\n"); + list_for_each_entry_safe(isert_conn, n, + &isert_np->np_accept_list, + accept_node) { + isert_info("cleaning isert_conn %p state (%d)\n", + isert_conn, isert_conn->state); + isert_connect_release(isert_conn); + } + } + mutex_unlock(&isert_np->np_accept_mutex); + + np->np_context = NULL; + kfree(isert_np); +} + +static void isert_release_work(struct work_struct *work) +{ + struct isert_conn *isert_conn = container_of(work, + struct isert_conn, + release_work); + + isert_info("Starting release conn %p\n", isert_conn); + + wait_for_completion(&isert_conn->wait); + + mutex_lock(&isert_conn->mutex); + isert_conn->state = ISER_CONN_DOWN; + mutex_unlock(&isert_conn->mutex); + + isert_info("Destroying conn %p\n", isert_conn); + isert_put_conn(isert_conn); +} + +static void +isert_wait4logout(struct isert_conn *isert_conn) +{ + struct iscsi_conn *conn = isert_conn->conn; + + isert_info("conn %p\n", isert_conn); + + if (isert_conn->logout_posted) { + isert_info("conn %p wait for conn_logout_comp\n", isert_conn); + wait_for_completion_timeout(&conn->conn_logout_comp, + SECONDS_FOR_LOGOUT_COMP * HZ); + } +} + +static void +isert_wait4cmds(struct iscsi_conn *conn) +{ + isert_info("iscsi_conn %p\n", conn); + + if (conn->sess) { + target_sess_cmd_list_set_waiting(conn->sess->se_sess); + target_wait_for_sess_cmds(conn->sess->se_sess); + } +} + +static void +isert_wait4flush(struct isert_conn *isert_conn) +{ + struct ib_recv_wr *bad_wr; + + isert_info("conn %p\n", isert_conn); + + init_completion(&isert_conn->wait_comp_err); + isert_conn->beacon.wr_id = ISER_BEACON_WRID; + /* post an indication that all flush errors were consumed */ + if (ib_post_recv(isert_conn->qp, &isert_conn->beacon, &bad_wr)) { + isert_err("conn %p failed to post beacon", isert_conn); + return; + } + + wait_for_completion(&isert_conn->wait_comp_err); +} + +static void isert_wait_conn(struct iscsi_conn *conn) +{ + struct isert_conn *isert_conn = conn->context; + + isert_info("Starting conn %p\n", isert_conn); + + mutex_lock(&isert_conn->mutex); + /* + * Only wait for wait_comp_err if the isert_conn made it + * into full feature phase.. + */ + if (isert_conn->state == ISER_CONN_INIT) { + mutex_unlock(&isert_conn->mutex); + return; + } + isert_conn_terminate(isert_conn); + mutex_unlock(&isert_conn->mutex); + + isert_wait4cmds(conn); + isert_wait4flush(isert_conn); + isert_wait4logout(isert_conn); + + queue_work(isert_release_wq, &isert_conn->release_work); +} + +static void isert_free_conn(struct iscsi_conn *conn) +{ + struct isert_conn *isert_conn = conn->context; + + isert_wait4flush(isert_conn); + isert_put_conn(isert_conn); +} + +static struct iscsit_transport iser_target_transport = { + .name = "IB/iSER", + .transport_type = ISCSI_INFINIBAND, + .priv_size = sizeof(struct isert_cmd), + .owner = THIS_MODULE, + .iscsit_setup_np = isert_setup_np, + .iscsit_accept_np = isert_accept_np, + .iscsit_free_np = isert_free_np, + .iscsit_wait_conn = isert_wait_conn, + .iscsit_free_conn = isert_free_conn, + .iscsit_get_login_rx = isert_get_login_rx, + .iscsit_put_login_tx = isert_put_login_tx, + .iscsit_immediate_queue = isert_immediate_queue, + .iscsit_response_queue = isert_response_queue, + .iscsit_get_dataout = isert_get_dataout, + .iscsit_queue_data_in = isert_put_datain, + .iscsit_queue_status = isert_put_response, + .iscsit_aborted_task = isert_aborted_task, + .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops, +}; + +static int __init isert_init(void) +{ + int ret; + + isert_comp_wq = alloc_workqueue("isert_comp_wq", + WQ_UNBOUND | WQ_HIGHPRI, 0); + if (!isert_comp_wq) { + isert_err("Unable to allocate isert_comp_wq\n"); + ret = -ENOMEM; + return -ENOMEM; + } + + isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND, + WQ_UNBOUND_MAX_ACTIVE); + if (!isert_release_wq) { + isert_err("Unable to allocate isert_release_wq\n"); + ret = -ENOMEM; + goto destroy_comp_wq; + } + + iscsit_register_transport(&iser_target_transport); + isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n"); + + return 0; + +destroy_comp_wq: + destroy_workqueue(isert_comp_wq); + + return ret; +} + +static void __exit isert_exit(void) +{ + flush_scheduled_work(); + destroy_workqueue(isert_release_wq); + destroy_workqueue(isert_comp_wq); + iscsit_unregister_transport(&iser_target_transport); + isert_info("iSER_TARGET[0] - Released iser_target_transport\n"); +} + +MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure"); +MODULE_VERSION("1.0"); +MODULE_AUTHOR("nab@Linux-iSCSI.org"); +MODULE_LICENSE("GPL"); + +module_init(isert_init); +module_exit(isert_exit); diff --git a/kernel/drivers/infiniband/ulp/isert/ib_isert.h b/kernel/drivers/infiniband/ulp/isert/ib_isert.h new file mode 100644 index 000000000..9ec23a786 --- /dev/null +++ b/kernel/drivers/infiniband/ulp/isert/ib_isert.h @@ -0,0 +1,231 @@ +#include +#include +#include +#include +#include + +#define DRV_NAME "isert" +#define PFX DRV_NAME ": " + +#define isert_dbg(fmt, arg...) \ + do { \ + if (unlikely(isert_debug_level > 2)) \ + printk(KERN_DEBUG PFX "%s: " fmt,\ + __func__ , ## arg); \ + } while (0) + +#define isert_warn(fmt, arg...) \ + do { \ + if (unlikely(isert_debug_level > 0)) \ + pr_warn(PFX "%s: " fmt, \ + __func__ , ## arg); \ + } while (0) + +#define isert_info(fmt, arg...) \ + do { \ + if (unlikely(isert_debug_level > 1)) \ + pr_info(PFX "%s: " fmt, \ + __func__ , ## arg); \ + } while (0) + +#define isert_err(fmt, arg...) \ + pr_err(PFX "%s: " fmt, __func__ , ## arg) + +#define ISCSI_ISER_SG_TABLESIZE 256 +#define ISER_FASTREG_LI_WRID 0xffffffffffffffffULL +#define ISER_BEACON_WRID 0xfffffffffffffffeULL + +enum isert_desc_type { + ISCSI_TX_CONTROL, + ISCSI_TX_DATAIN +}; + +enum iser_ib_op_code { + ISER_IB_RECV, + ISER_IB_SEND, + ISER_IB_RDMA_WRITE, + ISER_IB_RDMA_READ, +}; + +enum iser_conn_state { + ISER_CONN_INIT, + ISER_CONN_UP, + ISER_CONN_FULL_FEATURE, + ISER_CONN_TERMINATING, + ISER_CONN_DOWN, +}; + +struct iser_rx_desc { + struct iser_hdr iser_header; + struct iscsi_hdr iscsi_header; + char data[ISER_RECV_DATA_SEG_LEN]; + u64 dma_addr; + struct ib_sge rx_sg; + char pad[ISER_RX_PAD_SIZE]; +} __packed; + +struct iser_tx_desc { + struct iser_hdr iser_header; + struct iscsi_hdr iscsi_header; + enum isert_desc_type type; + u64 dma_addr; + struct ib_sge tx_sg[2]; + int num_sge; + struct isert_cmd *isert_cmd; + struct ib_send_wr send_wr; +} __packed; + +enum isert_indicator { + ISERT_PROTECTED = 1 << 0, + ISERT_DATA_KEY_VALID = 1 << 1, + ISERT_PROT_KEY_VALID = 1 << 2, + ISERT_SIG_KEY_VALID = 1 << 3, +}; + +struct pi_context { + struct ib_mr *prot_mr; + struct ib_fast_reg_page_list *prot_frpl; + struct ib_mr *sig_mr; +}; + +struct fast_reg_descriptor { + struct list_head list; + struct ib_mr *data_mr; + struct ib_fast_reg_page_list *data_frpl; + u8 ind; + struct pi_context *pi_ctx; +}; + +struct isert_data_buf { + struct scatterlist *sg; + int nents; + u32 sg_off; + u32 len; /* cur_rdma_length */ + u32 offset; + unsigned int dma_nents; + enum dma_data_direction dma_dir; +}; + +enum { + DATA = 0, + PROT = 1, + SIG = 2, +}; + +struct isert_rdma_wr { + struct list_head wr_list; + struct isert_cmd *isert_cmd; + enum iser_ib_op_code iser_ib_op; + struct ib_sge *ib_sge; + struct ib_sge s_ib_sge; + int send_wr_num; + struct ib_send_wr *send_wr; + struct ib_send_wr s_send_wr; + struct ib_sge ib_sg[3]; + struct isert_data_buf data; + struct isert_data_buf prot; + struct fast_reg_descriptor *fr_desc; +}; + +struct isert_cmd { + uint32_t read_stag; + uint32_t write_stag; + uint64_t read_va; + uint64_t write_va; + u64 pdu_buf_dma; + u32 pdu_buf_len; + u32 read_va_off; + u32 write_va_off; + u32 rdma_wr_num; + struct isert_conn *conn; + struct iscsi_cmd *iscsi_cmd; + struct iser_tx_desc tx_desc; + struct isert_rdma_wr rdma_wr; + struct work_struct comp_work; +}; + +struct isert_device; + +struct isert_conn { + enum iser_conn_state state; + int post_recv_buf_count; + u32 responder_resources; + u32 initiator_depth; + bool pi_support; + u32 max_sge; + char *login_buf; + char *login_req_buf; + char *login_rsp_buf; + u64 login_req_dma; + int login_req_len; + u64 login_rsp_dma; + unsigned int rx_desc_head; + struct iser_rx_desc *rx_descs; + struct ib_recv_wr rx_wr[ISERT_MIN_POSTED_RX]; + struct iscsi_conn *conn; + struct list_head accept_node; + struct completion login_comp; + struct completion login_req_comp; + struct iser_tx_desc login_tx_desc; + struct rdma_cm_id *cm_id; + struct ib_qp *qp; + struct isert_device *device; + struct mutex mutex; + struct completion wait; + struct completion wait_comp_err; + struct kref kref; + struct list_head fr_pool; + int fr_pool_size; + /* lock to protect fastreg pool */ + spinlock_t pool_lock; + struct work_struct release_work; + struct ib_recv_wr beacon; + bool logout_posted; +}; + +#define ISERT_MAX_CQ 64 + +/** + * struct isert_comp - iSER completion context + * + * @device: pointer to device handle + * @cq: completion queue + * @wcs: work completion array + * @active_qps: Number of active QPs attached + * to completion context + * @work: completion work handle + */ +struct isert_comp { + struct isert_device *device; + struct ib_cq *cq; + struct ib_wc wcs[16]; + int active_qps; + struct work_struct work; +}; + +struct isert_device { + int use_fastreg; + bool pi_capable; + int refcount; + struct ib_device *ib_device; + struct ib_pd *pd; + struct ib_mr *mr; + struct isert_comp *comps; + int comps_used; + struct list_head dev_node; + struct ib_device_attr dev_attr; + int (*reg_rdma_mem)(struct iscsi_conn *conn, + struct iscsi_cmd *cmd, + struct isert_rdma_wr *wr); + void (*unreg_rdma_mem)(struct isert_cmd *isert_cmd, + struct isert_conn *isert_conn); +}; + +struct isert_np { + struct iscsi_np *np; + struct semaphore np_sem; + struct rdma_cm_id *np_cm_id; + struct mutex np_accept_mutex; + struct list_head np_accept_list; + struct completion np_login_comp; +}; diff --git a/kernel/drivers/infiniband/ulp/isert/isert_proto.h b/kernel/drivers/infiniband/ulp/isert/isert_proto.h new file mode 100644 index 000000000..4dccd313b --- /dev/null +++ b/kernel/drivers/infiniband/ulp/isert/isert_proto.h @@ -0,0 +1,47 @@ +/* From iscsi_iser.h */ + +struct iser_hdr { + u8 flags; + u8 rsvd[3]; + __be32 write_stag; /* write rkey */ + __be64 write_va; + __be32 read_stag; /* read rkey */ + __be64 read_va; +} __packed; + +/*Constant PDU lengths calculations */ +#define ISER_HEADERS_LEN (sizeof(struct iser_hdr) + sizeof(struct iscsi_hdr)) + +#define ISER_RECV_DATA_SEG_LEN 8192 +#define ISER_RX_PAYLOAD_SIZE (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN) +#define ISER_RX_LOGIN_SIZE (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN) + +/* QP settings */ +/* Maximal bounds on received asynchronous PDUs */ +#define ISERT_MAX_TX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */ + +#define ISERT_MAX_RX_MISC_PDUS 6 /* NOOP_OUT(2), TEXT(1), * + * SCSI_TMFUNC(2), LOGOUT(1) */ + +#define ISCSI_DEF_XMIT_CMDS_MAX 128 /* from libiscsi.h, must be power of 2 */ + +#define ISERT_QP_MAX_RECV_DTOS (ISCSI_DEF_XMIT_CMDS_MAX) + +#define ISERT_MIN_POSTED_RX (ISCSI_DEF_XMIT_CMDS_MAX >> 2) + +#define ISERT_INFLIGHT_DATAOUTS 8 + +#define ISERT_QP_MAX_REQ_DTOS (ISCSI_DEF_XMIT_CMDS_MAX * \ + (1 + ISERT_INFLIGHT_DATAOUTS) + \ + ISERT_MAX_TX_MISC_PDUS + \ + ISERT_MAX_RX_MISC_PDUS) + +#define ISER_RX_PAD_SIZE (ISER_RECV_DATA_SEG_LEN + 4096 - \ + (ISER_RX_PAYLOAD_SIZE + sizeof(u64) + sizeof(struct ib_sge))) + +#define ISER_VER 0x10 +#define ISER_WSV 0x08 +#define ISER_RSV 0x04 +#define ISCSI_CTRL 0x10 +#define ISER_HELLO 0x20 +#define ISER_HELLORPLY 0x30 -- cgit 1.2.3-korg