From 1cef4659850eeb862c248c7670e404d7a1711ed1 Mon Sep 17 00:00:00 2001 From: Or Gerlitz Date: Mon, 8 Feb 2010 13:17:11 +0000 Subject: [PATCH 1/9] IB/iser: Revert commit bba7ebb "avoid recv buffer exhaustion" We will make a major change in the recv buffer posting logic, after which the problem commit bba7ebb "avoid recv buffer exhaustion caused by unexpected PDUs" comes to solve doesn't exist any more, so revert it. Signed-off-by: Or Gerlitz Signed-off-by: Roland Dreier --- drivers/infiniband/ulp/iser/iscsi_iser.h | 3 - drivers/infiniband/ulp/iser/iser_initiator.c | 146 ++++++------------- drivers/infiniband/ulp/iser/iser_verbs.c | 1 - 3 files changed, 48 insertions(+), 102 deletions(-) diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.h b/drivers/infiniband/ulp/iser/iscsi_iser.h index 9d529cae1f0d..e8dfdcfa1daf 100644 --- a/drivers/infiniband/ulp/iser/iscsi_iser.h +++ b/drivers/infiniband/ulp/iser/iscsi_iser.h @@ -252,9 +252,6 @@ struct iser_conn { wait_queue_head_t wait; /* waitq for conn/disconn */ atomic_t post_recv_buf_count; /* posted rx count */ atomic_t post_send_buf_count; /* posted tx count */ - atomic_t unexpected_pdu_count;/* count of received * - * unexpected pdus * - * not yet retired */ char name[ISER_OBJECT_NAME_SIZE]; struct iser_page_vec *page_vec; /* represents SG to fmr maps* * maps serialized as tx is*/ diff --git a/drivers/infiniband/ulp/iser/iser_initiator.c b/drivers/infiniband/ulp/iser/iser_initiator.c index 9de640200ad3..5f42fbe3080c 100644 --- a/drivers/infiniband/ulp/iser/iser_initiator.c +++ b/drivers/infiniband/ulp/iser/iser_initiator.c @@ -183,8 +183,14 @@ static int iser_post_receive_control(struct iscsi_conn *conn) struct iser_regd_buf *regd_data; struct iser_dto *recv_dto = NULL; struct iser_device *device = iser_conn->ib_conn->device; - int rx_data_size, err; - int posts, outstanding_unexp_pdus; + int rx_data_size, err = 0; + + rx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO); + if (rx_desc == NULL) { + iser_err("Failed to alloc desc for post recv\n"); + return -ENOMEM; + } + rx_desc->type = ISCSI_RX; /* for the login sequence we must support rx of upto 8K; login is done * after conn create/bind (connect) and conn stop/bind (reconnect), @@ -195,80 +201,46 @@ static int iser_post_receive_control(struct iscsi_conn *conn) else /* FIXME till user space sets conn->max_recv_dlength correctly */ rx_data_size = 128; - outstanding_unexp_pdus = - atomic_xchg(&iser_conn->ib_conn->unexpected_pdu_count, 0); - - /* - * in addition to the response buffer, replace those consumed by - * unexpected pdus. - */ - for (posts = 0; posts < 1 + outstanding_unexp_pdus; posts++) { - rx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO); - if (rx_desc == NULL) { - iser_err("Failed to alloc desc for post recv %d\n", - posts); - err = -ENOMEM; - goto post_rx_cache_alloc_failure; - } - rx_desc->type = ISCSI_RX; - rx_desc->data = kmalloc(rx_data_size, GFP_NOIO); - if (rx_desc->data == NULL) { - iser_err("Failed to alloc data buf for post recv %d\n", - posts); - err = -ENOMEM; - goto post_rx_kmalloc_failure; - } - - recv_dto = &rx_desc->dto; - recv_dto->ib_conn = iser_conn->ib_conn; - recv_dto->regd_vector_len = 0; - - regd_hdr = &rx_desc->hdr_regd_buf; - memset(regd_hdr, 0, sizeof(struct iser_regd_buf)); - regd_hdr->device = device; - regd_hdr->virt_addr = rx_desc; /* == &rx_desc->iser_header */ - regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN; - - iser_reg_single(device, regd_hdr, DMA_FROM_DEVICE); - - iser_dto_add_regd_buff(recv_dto, regd_hdr, 0, 0); - - regd_data = &rx_desc->data_regd_buf; - memset(regd_data, 0, sizeof(struct iser_regd_buf)); - regd_data->device = device; - regd_data->virt_addr = rx_desc->data; - regd_data->data_size = rx_data_size; - - iser_reg_single(device, regd_data, DMA_FROM_DEVICE); - - iser_dto_add_regd_buff(recv_dto, regd_data, 0, 0); - - err = iser_post_recv(rx_desc); - if (err) { - iser_err("Failed iser_post_recv for post %d\n", posts); - goto post_rx_post_recv_failure; - } + rx_desc->data = kmalloc(rx_data_size, GFP_NOIO); + if (rx_desc->data == NULL) { + iser_err("Failed to alloc data buf for post recv\n"); + err = -ENOMEM; + goto post_rx_kmalloc_failure; } - /* all posts successful */ - return 0; -post_rx_post_recv_failure: + recv_dto = &rx_desc->dto; + recv_dto->ib_conn = iser_conn->ib_conn; + recv_dto->regd_vector_len = 0; + + regd_hdr = &rx_desc->hdr_regd_buf; + memset(regd_hdr, 0, sizeof(struct iser_regd_buf)); + regd_hdr->device = device; + regd_hdr->virt_addr = rx_desc; /* == &rx_desc->iser_header */ + regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN; + + iser_reg_single(device, regd_hdr, DMA_FROM_DEVICE); + + iser_dto_add_regd_buff(recv_dto, regd_hdr, 0, 0); + + regd_data = &rx_desc->data_regd_buf; + memset(regd_data, 0, sizeof(struct iser_regd_buf)); + regd_data->device = device; + regd_data->virt_addr = rx_desc->data; + regd_data->data_size = rx_data_size; + + iser_reg_single(device, regd_data, DMA_FROM_DEVICE); + + iser_dto_add_regd_buff(recv_dto, regd_data, 0, 0); + + err = iser_post_recv(rx_desc); + if (!err) + return 0; + + /* iser_post_recv failed */ iser_dto_buffs_release(recv_dto); kfree(rx_desc->data); post_rx_kmalloc_failure: kmem_cache_free(ig.desc_cache, rx_desc); -post_rx_cache_alloc_failure: - if (posts > 0) { - /* - * response buffer posted, but did not replace all unexpected - * pdu recv bufs. Ignore error, retry occurs next send - */ - outstanding_unexp_pdus -= (posts - 1); - err = 0; - } - atomic_add(outstanding_unexp_pdus, - &iser_conn->ib_conn->unexpected_pdu_count); - return err; } @@ -302,10 +274,8 @@ int iser_conn_set_full_featured_mode(struct iscsi_conn *conn) struct iscsi_iser_conn *iser_conn = conn->dd_data; int i; - /* - * FIXME this value should be declared to the target during login with - * the MaxOutstandingUnexpectedPDUs key when supported - */ + /* no need to keep it in a var, we are after login so if this should + * be negotiated, by now the result should be available here */ int initial_post_recv_bufs_num = ISER_MAX_RX_MISC_PDUS; iser_dbg("Initially post: %d\n", initial_post_recv_bufs_num); @@ -507,7 +477,6 @@ int iser_send_control(struct iscsi_conn *conn, int err = 0; struct iser_regd_buf *regd_buf; struct iser_device *device; - unsigned char opcode; if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) { iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn); @@ -542,15 +511,10 @@ int iser_send_control(struct iscsi_conn *conn, data_seg_len); } - opcode = task->hdr->opcode & ISCSI_OPCODE_MASK; - - /* post recv buffer for response if one is expected */ - if (!(opcode == ISCSI_OP_NOOP_OUT && task->hdr->itt == RESERVED_ITT)) { - if (iser_post_receive_control(conn) != 0) { - iser_err("post_rcv_buff failed!\n"); - err = -ENOMEM; - goto send_control_error; - } + if (iser_post_receive_control(conn) != 0) { + iser_err("post_rcv_buff failed!\n"); + err = -ENOMEM; + goto send_control_error; } err = iser_post_send(mdesc); @@ -621,20 +585,6 @@ void iser_rcv_completion(struct iser_desc *rx_desc, * parallel to the execution of iser_conn_term. So the code that waits * * for the posted rx bufs refcount to become zero handles everything */ atomic_dec(&conn->ib_conn->post_recv_buf_count); - - /* - * if an unexpected PDU was received then the recv wr consumed must - * be replaced, this is done in the next send of a control-type PDU - */ - if (opcode == ISCSI_OP_NOOP_IN && hdr->itt == RESERVED_ITT) { - /* nop-in with itt = 0xffffffff */ - atomic_inc(&conn->ib_conn->unexpected_pdu_count); - } - else if (opcode == ISCSI_OP_ASYNC_EVENT) { - /* asyncronous message */ - atomic_inc(&conn->ib_conn->unexpected_pdu_count); - } - /* a reject PDU consumes the recv buf posted for the response */ } void iser_snd_completion(struct iser_desc *tx_desc) diff --git a/drivers/infiniband/ulp/iser/iser_verbs.c b/drivers/infiniband/ulp/iser/iser_verbs.c index 8579f32ce38e..7092503a10e3 100644 --- a/drivers/infiniband/ulp/iser/iser_verbs.c +++ b/drivers/infiniband/ulp/iser/iser_verbs.c @@ -491,7 +491,6 @@ void iser_conn_init(struct iser_conn *ib_conn) init_waitqueue_head(&ib_conn->wait); atomic_set(&ib_conn->post_recv_buf_count, 0); atomic_set(&ib_conn->post_send_buf_count, 0); - atomic_set(&ib_conn->unexpected_pdu_count, 0); atomic_set(&ib_conn->refcount, 1); INIT_LIST_HEAD(&ib_conn->conn_list); spin_lock_init(&ib_conn->lock); From bcc60c381d857ced653e912cbe6121294773e147 Mon Sep 17 00:00:00 2001 From: Or Gerlitz Date: Mon, 8 Feb 2010 13:17:42 +0000 Subject: [PATCH 2/9] IB/iser: New receive buffer posting logic Currently, the recv buffer posting logic is based on the transactional nature of iSER which allows for posting a buffer before sending a PDU. Change this to post only when the number of outstanding recv buffers is below a water mark and in a batched manner, thus simplifying and optimizing the data path. Use a pre-allocated ring of recv buffers instead of allocating from kmem cache. A special treatment is given to the login response buffer whose size must be 8K unlike the size of buffers used for any other purpose which is 128 bytes. Signed-off-by: Or Gerlitz Signed-off-by: Roland Dreier --- drivers/infiniband/ulp/iser/iscsi_iser.c | 2 +- drivers/infiniband/ulp/iser/iscsi_iser.h | 40 +++- drivers/infiniband/ulp/iser/iser_initiator.c | 235 +++++++++---------- drivers/infiniband/ulp/iser/iser_verbs.c | 134 +++++++---- 4 files changed, 235 insertions(+), 176 deletions(-) diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c index 5f7a6fca0a4d..355470e7e904 100644 --- a/drivers/infiniband/ulp/iser/iscsi_iser.c +++ b/drivers/infiniband/ulp/iser/iscsi_iser.c @@ -283,7 +283,7 @@ iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) * due to issues with the login code re iser sematics * this not set in iscsi_conn_setup - FIXME */ - conn->max_recv_dlength = 128; + conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN; iser_conn = conn->dd_data; conn->dd_data = iser_conn; diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.h b/drivers/infiniband/ulp/iser/iscsi_iser.h index e8dfdcfa1daf..83effb610594 100644 --- a/drivers/infiniband/ulp/iser/iscsi_iser.h +++ b/drivers/infiniband/ulp/iser/iscsi_iser.h @@ -102,9 +102,9 @@ #define ISER_MAX_TX_MISC_PDUS 6 /* NOOP_OUT(2), TEXT(1), * * SCSI_TMFUNC(2), LOGOUT(1) */ -#define ISER_QP_MAX_RECV_DTOS (ISCSI_DEF_XMIT_CMDS_MAX + \ - ISER_MAX_RX_MISC_PDUS + \ - ISER_MAX_TX_MISC_PDUS) +#define ISER_QP_MAX_RECV_DTOS (ISCSI_DEF_XMIT_CMDS_MAX) + +#define ISER_MIN_POSTED_RX (ISCSI_DEF_XMIT_CMDS_MAX >> 2) /* the max TX (send) WR supported by the iSER QP is defined by * * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect * @@ -132,6 +132,12 @@ struct iser_hdr { __be64 read_va; } __attribute__((packed)); +/* Constant PDU lengths calculations */ +#define ISER_HEADERS_LEN (sizeof(struct iser_hdr) + sizeof(struct iscsi_hdr)) + +#define ISER_RECV_DATA_SEG_LEN 128 +#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) /* Length of an object name string */ #define ISER_OBJECT_NAME_SIZE 64 @@ -212,7 +218,6 @@ struct iser_dto { }; enum iser_desc_type { - ISCSI_RX, ISCSI_TX_CONTROL , ISCSI_TX_SCSI_COMMAND, ISCSI_TX_DATAOUT @@ -228,6 +233,17 @@ struct iser_desc { struct iser_dto dto; }; +#define ISER_RX_PAD_SIZE (256 - (ISER_RX_PAYLOAD_SIZE + \ + sizeof(u64) + sizeof(struct ib_sge))) +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]; +} __attribute__((packed)); + struct iser_device { struct ib_device *ib_device; struct ib_pd *pd; @@ -256,6 +272,12 @@ struct iser_conn { struct iser_page_vec *page_vec; /* represents SG to fmr maps* * maps serialized as tx is*/ struct list_head conn_list; /* entry in ig conn list */ + + char *login_buf; + u64 login_dma; + unsigned int rx_desc_head; + struct iser_rx_desc *rx_descs; + struct ib_recv_wr rx_wr[ISER_MIN_POSTED_RX]; }; struct iscsi_iser_conn { @@ -319,8 +341,9 @@ void iser_conn_put(struct iser_conn *ib_conn); void iser_conn_terminate(struct iser_conn *ib_conn); -void iser_rcv_completion(struct iser_desc *desc, - unsigned long dto_xfer_len); +void iser_rcv_completion(struct iser_rx_desc *desc, + unsigned long dto_xfer_len, + struct iser_conn *ib_conn); void iser_snd_completion(struct iser_desc *desc); @@ -332,6 +355,8 @@ void iser_dto_buffs_release(struct iser_dto *dto); int iser_regd_buff_release(struct iser_regd_buf *regd_buf); +void iser_free_rx_descriptors(struct iser_conn *ib_conn); + void iser_reg_single(struct iser_device *device, struct iser_regd_buf *regd_buf, enum dma_data_direction direction); @@ -353,7 +378,8 @@ int iser_reg_page_vec(struct iser_conn *ib_conn, void iser_unreg_mem(struct iser_mem_reg *mem_reg); -int iser_post_recv(struct iser_desc *rx_desc); +int iser_post_recvl(struct iser_conn *ib_conn); +int iser_post_recvm(struct iser_conn *ib_conn, int count); int iser_post_send(struct iser_desc *tx_desc); int iser_conn_state_comp(struct iser_conn *ib_conn, diff --git a/drivers/infiniband/ulp/iser/iser_initiator.c b/drivers/infiniband/ulp/iser/iser_initiator.c index 5f42fbe3080c..6d9bbe6363ee 100644 --- a/drivers/infiniband/ulp/iser/iser_initiator.c +++ b/drivers/infiniband/ulp/iser/iser_initiator.c @@ -39,9 +39,6 @@ #include "iscsi_iser.h" -/* Constant PDU lengths calculations */ -#define ISER_TOTAL_HEADERS_LEN (sizeof (struct iser_hdr) + \ - sizeof (struct iscsi_hdr)) /* iser_dto_add_regd_buff - increments the reference count for * * the registered buffer & adds it to the DTO object */ @@ -172,78 +169,6 @@ iser_prepare_write_cmd(struct iscsi_task *task, return 0; } -/** - * iser_post_receive_control - allocates, initializes and posts receive DTO. - */ -static int iser_post_receive_control(struct iscsi_conn *conn) -{ - struct iscsi_iser_conn *iser_conn = conn->dd_data; - struct iser_desc *rx_desc; - struct iser_regd_buf *regd_hdr; - struct iser_regd_buf *regd_data; - struct iser_dto *recv_dto = NULL; - struct iser_device *device = iser_conn->ib_conn->device; - int rx_data_size, err = 0; - - rx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO); - if (rx_desc == NULL) { - iser_err("Failed to alloc desc for post recv\n"); - return -ENOMEM; - } - rx_desc->type = ISCSI_RX; - - /* for the login sequence we must support rx of upto 8K; login is done - * after conn create/bind (connect) and conn stop/bind (reconnect), - * what's common for both schemes is that the connection is not started - */ - if (conn->c_stage != ISCSI_CONN_STARTED) - rx_data_size = ISCSI_DEF_MAX_RECV_SEG_LEN; - else /* FIXME till user space sets conn->max_recv_dlength correctly */ - rx_data_size = 128; - - rx_desc->data = kmalloc(rx_data_size, GFP_NOIO); - if (rx_desc->data == NULL) { - iser_err("Failed to alloc data buf for post recv\n"); - err = -ENOMEM; - goto post_rx_kmalloc_failure; - } - - recv_dto = &rx_desc->dto; - recv_dto->ib_conn = iser_conn->ib_conn; - recv_dto->regd_vector_len = 0; - - regd_hdr = &rx_desc->hdr_regd_buf; - memset(regd_hdr, 0, sizeof(struct iser_regd_buf)); - regd_hdr->device = device; - regd_hdr->virt_addr = rx_desc; /* == &rx_desc->iser_header */ - regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN; - - iser_reg_single(device, regd_hdr, DMA_FROM_DEVICE); - - iser_dto_add_regd_buff(recv_dto, regd_hdr, 0, 0); - - regd_data = &rx_desc->data_regd_buf; - memset(regd_data, 0, sizeof(struct iser_regd_buf)); - regd_data->device = device; - regd_data->virt_addr = rx_desc->data; - regd_data->data_size = rx_data_size; - - iser_reg_single(device, regd_data, DMA_FROM_DEVICE); - - iser_dto_add_regd_buff(recv_dto, regd_data, 0, 0); - - err = iser_post_recv(rx_desc); - if (!err) - return 0; - - /* iser_post_recv failed */ - iser_dto_buffs_release(recv_dto); - kfree(rx_desc->data); -post_rx_kmalloc_failure: - kmem_cache_free(ig.desc_cache, rx_desc); - return err; -} - /* creates a new tx descriptor and adds header regd buffer */ static void iser_create_send_desc(struct iscsi_iser_conn *iser_conn, struct iser_desc *tx_desc) @@ -254,7 +179,7 @@ static void iser_create_send_desc(struct iscsi_iser_conn *iser_conn, memset(regd_hdr, 0, sizeof(struct iser_regd_buf)); regd_hdr->device = iser_conn->ib_conn->device; regd_hdr->virt_addr = tx_desc; /* == &tx_desc->iser_header */ - regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN; + regd_hdr->data_size = ISER_HEADERS_LEN; send_dto->ib_conn = iser_conn->ib_conn; send_dto->notify_enable = 1; @@ -266,6 +191,72 @@ static void iser_create_send_desc(struct iscsi_iser_conn *iser_conn, iser_dto_add_regd_buff(send_dto, regd_hdr, 0, 0); } +int iser_alloc_rx_descriptors(struct iser_conn *ib_conn) +{ + int i, j; + u64 dma_addr; + struct iser_rx_desc *rx_desc; + struct ib_sge *rx_sg; + struct iser_device *device = ib_conn->device; + + ib_conn->rx_descs = kmalloc(ISER_QP_MAX_RECV_DTOS * + sizeof(struct iser_rx_desc), GFP_KERNEL); + if (!ib_conn->rx_descs) + goto rx_desc_alloc_fail; + + rx_desc = ib_conn->rx_descs; + + for (i = 0; i < ISER_QP_MAX_RECV_DTOS; i++, rx_desc++) { + dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc, + ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); + if (ib_dma_mapping_error(device->ib_device, dma_addr)) + goto rx_desc_dma_map_failed; + + 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; + } + + ib_conn->rx_desc_head = 0; + return 0; + +rx_desc_dma_map_failed: + rx_desc = ib_conn->rx_descs; + for (j = 0; j < i; j++, rx_desc++) + ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, + ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); + kfree(ib_conn->rx_descs); + ib_conn->rx_descs = NULL; +rx_desc_alloc_fail: + iser_err("failed allocating rx descriptors / data buffers\n"); + return -ENOMEM; +} + +void iser_free_rx_descriptors(struct iser_conn *ib_conn) +{ + int i; + struct iser_rx_desc *rx_desc; + struct iser_device *device = ib_conn->device; + + if (ib_conn->login_buf) { + ib_dma_unmap_single(device->ib_device, ib_conn->login_dma, + ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE); + kfree(ib_conn->login_buf); + } + + if (!ib_conn->rx_descs) + return; + + rx_desc = ib_conn->rx_descs; + for (i = 0; i < ISER_QP_MAX_RECV_DTOS; i++, rx_desc++) + ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, + ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); + kfree(ib_conn->rx_descs); +} + /** * iser_conn_set_full_featured_mode - (iSER API) */ @@ -273,27 +264,20 @@ int iser_conn_set_full_featured_mode(struct iscsi_conn *conn) { struct iscsi_iser_conn *iser_conn = conn->dd_data; - int i; - /* no need to keep it in a var, we are after login so if this should - * be negotiated, by now the result should be available here */ - int initial_post_recv_bufs_num = ISER_MAX_RX_MISC_PDUS; - - iser_dbg("Initially post: %d\n", initial_post_recv_bufs_num); + iser_dbg("Initially post: %d\n", ISER_MIN_POSTED_RX); /* Check that there is no posted recv or send buffers left - */ /* they must be consumed during the login phase */ BUG_ON(atomic_read(&iser_conn->ib_conn->post_recv_buf_count) != 0); BUG_ON(atomic_read(&iser_conn->ib_conn->post_send_buf_count) != 0); + if (iser_alloc_rx_descriptors(iser_conn->ib_conn)) + return -ENOMEM; + /* Initial post receive buffers */ - for (i = 0; i < initial_post_recv_bufs_num; i++) { - if (iser_post_receive_control(conn) != 0) { - iser_err("Failed to post recv bufs at:%d conn:0x%p\n", - i, conn); - return -ENOMEM; - } - } - iser_dbg("Posted %d post recv bufs, conn:0x%p\n", i, conn); + if (iser_post_recvm(iser_conn->ib_conn, ISER_MIN_POSTED_RX)) + return -ENOMEM; + return 0; } @@ -321,7 +305,7 @@ int iser_send_command(struct iscsi_conn *conn, struct iscsi_iser_task *iser_task = task->dd_data; struct iser_dto *send_dto = NULL; unsigned long edtl; - int err = 0; + int err; struct iser_data_buf *data_buf; struct iscsi_cmd *hdr = (struct iscsi_cmd *)task->hdr; struct scsi_cmnd *sc = task->sc; @@ -371,12 +355,6 @@ int iser_send_command(struct iscsi_conn *conn, iser_reg_single(iser_conn->ib_conn->device, send_dto->regd[0], DMA_TO_DEVICE); - if (iser_post_receive_control(conn) != 0) { - iser_err("post_recv failed!\n"); - err = -ENOMEM; - goto send_command_error; - } - iser_task->status = ISER_TASK_STATUS_STARTED; err = iser_post_send(&iser_task->desc); @@ -474,7 +452,7 @@ int iser_send_control(struct iscsi_conn *conn, struct iser_desc *mdesc = &iser_task->desc; struct iser_dto *send_dto = NULL; unsigned long data_seg_len; - int err = 0; + int err; struct iser_regd_buf *regd_buf; struct iser_device *device; @@ -511,10 +489,10 @@ int iser_send_control(struct iscsi_conn *conn, data_seg_len); } - if (iser_post_receive_control(conn) != 0) { - iser_err("post_rcv_buff failed!\n"); - err = -ENOMEM; - goto send_control_error; + if (task == conn->login_task) { + err = iser_post_recvl(iser_conn->ib_conn); + if (err) + goto send_control_error; } err = iser_post_send(mdesc); @@ -530,27 +508,34 @@ int iser_send_control(struct iscsi_conn *conn, /** * iser_rcv_dto_completion - recv DTO completion */ -void iser_rcv_completion(struct iser_desc *rx_desc, - unsigned long dto_xfer_len) +void iser_rcv_completion(struct iser_rx_desc *rx_desc, + unsigned long rx_xfer_len, + struct iser_conn *ib_conn) { - struct iser_dto *dto = &rx_desc->dto; - struct iscsi_iser_conn *conn = dto->ib_conn->iser_conn; + struct iscsi_iser_conn *conn = ib_conn->iser_conn; struct iscsi_task *task; struct iscsi_iser_task *iser_task; struct iscsi_hdr *hdr; - char *rx_data = NULL; - int rx_data_len = 0; unsigned char opcode; + u64 rx_dma; + int rx_buflen, outstanding, count, err; + + /* differentiate between login to all other PDUs */ + if ((char *)rx_desc == ib_conn->login_buf) { + rx_dma = ib_conn->login_dma; + rx_buflen = ISER_RX_LOGIN_SIZE; + } else { + rx_dma = rx_desc->dma_addr; + rx_buflen = ISER_RX_PAYLOAD_SIZE; + } + + ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, rx_dma, + rx_buflen, DMA_FROM_DEVICE); hdr = &rx_desc->iscsi_header; - iser_dbg("op 0x%x itt 0x%x\n", hdr->opcode,hdr->itt); - - if (dto_xfer_len > ISER_TOTAL_HEADERS_LEN) { /* we have data */ - rx_data_len = dto_xfer_len - ISER_TOTAL_HEADERS_LEN; - rx_data = dto->regd[1]->virt_addr; - rx_data += dto->offset[1]; - } + iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode, + hdr->itt, (int)(rx_xfer_len - ISER_HEADERS_LEN)); opcode = hdr->opcode & ISCSI_OPCODE_MASK; @@ -573,18 +558,30 @@ void iser_rcv_completion(struct iser_desc *rx_desc, iscsi_put_task(task); } } - iser_dto_buffs_release(dto); - iscsi_iser_recv(conn->iscsi_conn, hdr, rx_data, rx_data_len); + iscsi_iser_recv(conn->iscsi_conn, hdr, + rx_desc->data, rx_xfer_len - ISER_HEADERS_LEN); - kfree(rx_desc->data); - kmem_cache_free(ig.desc_cache, rx_desc); + ib_dma_sync_single_for_device(ib_conn->device->ib_device, rx_dma, + rx_buflen, DMA_FROM_DEVICE); /* decrementing conn->post_recv_buf_count only --after-- freeing the * * task eliminates the need to worry on tasks which are completed in * * parallel to the execution of iser_conn_term. So the code that waits * * for the posted rx bufs refcount to become zero handles everything */ atomic_dec(&conn->ib_conn->post_recv_buf_count); + + if (rx_dma == ib_conn->login_dma) + return; + + outstanding = atomic_read(&ib_conn->post_recv_buf_count); + if (outstanding + ISER_MIN_POSTED_RX <= ISER_QP_MAX_RECV_DTOS) { + count = min(ISER_QP_MAX_RECV_DTOS - outstanding, + ISER_MIN_POSTED_RX); + err = iser_post_recvm(ib_conn, count); + if (err) + iser_err("posting %d rx bufs err %d\n", count, err); + } } void iser_snd_completion(struct iser_desc *tx_desc) diff --git a/drivers/infiniband/ulp/iser/iser_verbs.c b/drivers/infiniband/ulp/iser/iser_verbs.c index 7092503a10e3..89b956044060 100644 --- a/drivers/infiniband/ulp/iser/iser_verbs.c +++ b/drivers/infiniband/ulp/iser/iser_verbs.c @@ -129,13 +129,23 @@ static int iser_create_ib_conn_res(struct iser_conn *ib_conn) { struct iser_device *device; struct ib_qp_init_attr init_attr; - int ret; + int ret = -ENOMEM; struct ib_fmr_pool_param params; BUG_ON(ib_conn->device == NULL); device = ib_conn->device; + ib_conn->login_buf = kmalloc(ISER_RX_LOGIN_SIZE, GFP_KERNEL); + if (!ib_conn->login_buf) { + goto alloc_err; + ret = -ENOMEM; + } + + ib_conn->login_dma = ib_dma_map_single(ib_conn->device->ib_device, + (void *)ib_conn->login_buf, ISER_RX_LOGIN_SIZE, + DMA_FROM_DEVICE); + ib_conn->page_vec = kmalloc(sizeof(struct iser_page_vec) + (sizeof(u64) * (ISCSI_ISER_SG_TABLESIZE +1)), GFP_KERNEL); @@ -174,7 +184,7 @@ static int iser_create_ib_conn_res(struct iser_conn *ib_conn) init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS; init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS; init_attr.cap.max_send_sge = MAX_REGD_BUF_VECTOR_LEN; - init_attr.cap.max_recv_sge = 2; + init_attr.cap.max_recv_sge = 1; init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; init_attr.qp_type = IB_QPT_RC; @@ -192,6 +202,7 @@ static int iser_create_ib_conn_res(struct iser_conn *ib_conn) (void)ib_destroy_fmr_pool(ib_conn->fmr_pool); fmr_pool_err: kfree(ib_conn->page_vec); + kfree(ib_conn->login_buf); alloc_err: iser_err("unable to alloc mem or create resource, err %d\n", ret); return ret; @@ -314,7 +325,7 @@ static void iser_conn_release(struct iser_conn *ib_conn) mutex_lock(&ig.connlist_mutex); list_del(&ib_conn->conn_list); mutex_unlock(&ig.connlist_mutex); - + iser_free_rx_descriptors(ib_conn); iser_free_ib_conn_res(ib_conn); ib_conn->device = NULL; /* on EVENT_ADDR_ERROR there's no device yet for this conn */ @@ -625,6 +636,60 @@ void iser_unreg_mem(struct iser_mem_reg *reg) reg->mem_h = NULL; } +int iser_post_recvl(struct iser_conn *ib_conn) +{ + struct ib_recv_wr rx_wr, *rx_wr_failed; + struct ib_sge sge; + int ib_ret; + + sge.addr = ib_conn->login_dma; + sge.length = ISER_RX_LOGIN_SIZE; + sge.lkey = ib_conn->device->mr->lkey; + + rx_wr.wr_id = (unsigned long)ib_conn->login_buf; + rx_wr.sg_list = &sge; + rx_wr.num_sge = 1; + rx_wr.next = NULL; + + atomic_inc(&ib_conn->post_recv_buf_count); + ib_ret = ib_post_recv(ib_conn->qp, &rx_wr, &rx_wr_failed); + if (ib_ret) { + iser_err("ib_post_recv failed ret=%d\n", ib_ret); + atomic_dec(&ib_conn->post_recv_buf_count); + } + return ib_ret; +} + +int iser_post_recvm(struct iser_conn *ib_conn, int count) +{ + struct ib_recv_wr *rx_wr, *rx_wr_failed; + int i, ib_ret; + unsigned int my_rx_head = ib_conn->rx_desc_head; + struct iser_rx_desc *rx_desc; + + for (rx_wr = ib_conn->rx_wr, i = 0; i < count; i++, rx_wr++) { + rx_desc = &ib_conn->rx_descs[my_rx_head]; + rx_wr->wr_id = (unsigned long)rx_desc; + rx_wr->sg_list = &rx_desc->rx_sg; + rx_wr->num_sge = 1; + rx_wr->next = rx_wr + 1; + my_rx_head = (my_rx_head + 1) & (ISER_QP_MAX_RECV_DTOS - 1); + } + + rx_wr--; + rx_wr->next = NULL; /* mark end of work requests list */ + + atomic_add(count, &ib_conn->post_recv_buf_count); + ib_ret = ib_post_recv(ib_conn->qp, ib_conn->rx_wr, &rx_wr_failed); + if (ib_ret) { + iser_err("ib_post_recv failed ret=%d\n", ib_ret); + atomic_sub(count, &ib_conn->post_recv_buf_count); + } else + ib_conn->rx_desc_head = my_rx_head; + return ib_ret; +} + + /** * iser_dto_to_iov - builds IOV from a dto descriptor */ @@ -665,39 +730,6 @@ static void iser_dto_to_iov(struct iser_dto *dto, struct ib_sge *iov, int iov_le } } -/** - * iser_post_recv - Posts a receive buffer. - * - * returns 0 on success, -1 on failure - */ -int iser_post_recv(struct iser_desc *rx_desc) -{ - int ib_ret, ret_val = 0; - struct ib_recv_wr recv_wr, *recv_wr_failed; - struct ib_sge iov[2]; - struct iser_conn *ib_conn; - struct iser_dto *recv_dto = &rx_desc->dto; - - /* Retrieve conn */ - ib_conn = recv_dto->ib_conn; - - iser_dto_to_iov(recv_dto, iov, 2); - - recv_wr.next = NULL; - recv_wr.sg_list = iov; - recv_wr.num_sge = recv_dto->regd_vector_len; - recv_wr.wr_id = (unsigned long)rx_desc; - - atomic_inc(&ib_conn->post_recv_buf_count); - ib_ret = ib_post_recv(ib_conn->qp, &recv_wr, &recv_wr_failed); - if (ib_ret) { - iser_err("ib_post_recv failed ret=%d\n", ib_ret); - atomic_dec(&ib_conn->post_recv_buf_count); - ret_val = -1; - } - - return ret_val; -} /** * iser_start_send - Initiate a Send DTO operation @@ -737,18 +769,17 @@ int iser_post_send(struct iser_desc *tx_desc) return ret_val; } -static void iser_handle_comp_error(struct iser_desc *desc) +static void iser_handle_comp_error(struct iser_desc *desc, + struct iser_conn *ib_conn) { - struct iser_dto *dto = &desc->dto; - struct iser_conn *ib_conn = dto->ib_conn; + struct iser_rx_desc *rx = (struct iser_rx_desc *)desc; + struct iser_rx_desc *rx_first = ib_conn->rx_descs; + struct iser_rx_desc *rx_last = rx_first + (ISER_QP_MAX_RECV_DTOS - 1); - iser_dto_buffs_release(dto); - - if (desc->type == ISCSI_RX) { - kfree(desc->data); - kmem_cache_free(ig.desc_cache, desc); + if ((char *)desc == ib_conn->login_buf || + (rx_first <= rx && rx <= rx_last)) atomic_dec(&ib_conn->post_recv_buf_count); - } else { /* type is TX control/command/dataout */ + else { /* type is TX control/command/dataout */ if (desc->type == ISCSI_TX_DATAOUT) kmem_cache_free(ig.desc_cache, desc); atomic_dec(&ib_conn->post_send_buf_count); @@ -780,20 +811,25 @@ static void iser_cq_tasklet_fn(unsigned long data) struct ib_wc wc; struct iser_desc *desc; unsigned long xfer_len; + struct iser_conn *ib_conn; while (ib_poll_cq(cq, 1, &wc) == 1) { desc = (struct iser_desc *) (unsigned long) wc.wr_id; BUG_ON(desc == NULL); + ib_conn = wc.qp->qp_context; if (wc.status == IB_WC_SUCCESS) { - if (desc->type == ISCSI_RX) { + if (wc.opcode == IB_WC_RECV) { xfer_len = (unsigned long)wc.byte_len; - iser_rcv_completion(desc, xfer_len); + iser_rcv_completion((struct iser_rx_desc *)desc, + xfer_len, ib_conn); } else /* type == ISCSI_TX_CONTROL/SCSI_CMD/DOUT */ iser_snd_completion(desc); } else { - iser_err("comp w. error op %d status %d\n",desc->type,wc.status); - iser_handle_comp_error(desc); + if (wc.status != IB_WC_WR_FLUSH_ERR) + iser_err("id %llx status %d vend_err %x\n", + wc.wr_id, wc.status, wc.vendor_err); + iser_handle_comp_error(desc, ib_conn); } } /* #warning "it is assumed here that arming CQ only once its empty" * From 704315f082d473b34047817f0a6a01924f38501e Mon Sep 17 00:00:00 2001 From: Or Gerlitz Date: Mon, 8 Feb 2010 13:18:39 +0000 Subject: [PATCH 3/9] IB/iser: Remove atomic counter for posted receive buffers Now that both the posting and reaping of receive buffers is done in the completion path, the counter of outstanding buffers not be atomic. Signed-off-by: Or Gerlitz Signed-off-by: Roland Dreier --- drivers/infiniband/ulp/iser/iscsi_iser.h | 2 +- drivers/infiniband/ulp/iser/iser_initiator.c | 6 +++--- drivers/infiniband/ulp/iser/iser_verbs.c | 16 ++++++++-------- 3 files changed, 12 insertions(+), 12 deletions(-) diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.h b/drivers/infiniband/ulp/iser/iscsi_iser.h index 83effb610594..4491235340de 100644 --- a/drivers/infiniband/ulp/iser/iscsi_iser.h +++ b/drivers/infiniband/ulp/iser/iscsi_iser.h @@ -266,7 +266,7 @@ struct iser_conn { struct ib_fmr_pool *fmr_pool; /* pool of IB FMRs */ int disc_evt_flag; /* disconn event delivered */ wait_queue_head_t wait; /* waitq for conn/disconn */ - atomic_t post_recv_buf_count; /* posted rx count */ + int post_recv_buf_count; /* posted rx count */ atomic_t post_send_buf_count; /* posted tx count */ char name[ISER_OBJECT_NAME_SIZE]; struct iser_page_vec *page_vec; /* represents SG to fmr maps* diff --git a/drivers/infiniband/ulp/iser/iser_initiator.c b/drivers/infiniband/ulp/iser/iser_initiator.c index 6d9bbe6363ee..3e65a43d2154 100644 --- a/drivers/infiniband/ulp/iser/iser_initiator.c +++ b/drivers/infiniband/ulp/iser/iser_initiator.c @@ -268,7 +268,7 @@ int iser_conn_set_full_featured_mode(struct iscsi_conn *conn) /* Check that there is no posted recv or send buffers left - */ /* they must be consumed during the login phase */ - BUG_ON(atomic_read(&iser_conn->ib_conn->post_recv_buf_count) != 0); + BUG_ON(iser_conn->ib_conn->post_recv_buf_count != 0); BUG_ON(atomic_read(&iser_conn->ib_conn->post_send_buf_count) != 0); if (iser_alloc_rx_descriptors(iser_conn->ib_conn)) @@ -569,12 +569,12 @@ void iser_rcv_completion(struct iser_rx_desc *rx_desc, * task eliminates the need to worry on tasks which are completed in * * parallel to the execution of iser_conn_term. So the code that waits * * for the posted rx bufs refcount to become zero handles everything */ - atomic_dec(&conn->ib_conn->post_recv_buf_count); + conn->ib_conn->post_recv_buf_count--; if (rx_dma == ib_conn->login_dma) return; - outstanding = atomic_read(&ib_conn->post_recv_buf_count); + outstanding = ib_conn->post_recv_buf_count; if (outstanding + ISER_MIN_POSTED_RX <= ISER_QP_MAX_RECV_DTOS) { count = min(ISER_QP_MAX_RECV_DTOS - outstanding, ISER_MIN_POSTED_RX); diff --git a/drivers/infiniband/ulp/iser/iser_verbs.c b/drivers/infiniband/ulp/iser/iser_verbs.c index 89b956044060..202c00dc6a76 100644 --- a/drivers/infiniband/ulp/iser/iser_verbs.c +++ b/drivers/infiniband/ulp/iser/iser_verbs.c @@ -453,7 +453,7 @@ static void iser_disconnected_handler(struct rdma_cm_id *cma_id) ISCSI_ERR_CONN_FAILED); /* Complete the termination process if no posts are pending */ - if ((atomic_read(&ib_conn->post_recv_buf_count) == 0) && + if (ib_conn->post_recv_buf_count == 0 && (atomic_read(&ib_conn->post_send_buf_count) == 0)) { ib_conn->state = ISER_CONN_DOWN; wake_up_interruptible(&ib_conn->wait); @@ -500,7 +500,7 @@ void iser_conn_init(struct iser_conn *ib_conn) { ib_conn->state = ISER_CONN_INIT; init_waitqueue_head(&ib_conn->wait); - atomic_set(&ib_conn->post_recv_buf_count, 0); + ib_conn->post_recv_buf_count = 0; atomic_set(&ib_conn->post_send_buf_count, 0); atomic_set(&ib_conn->refcount, 1); INIT_LIST_HEAD(&ib_conn->conn_list); @@ -651,11 +651,11 @@ int iser_post_recvl(struct iser_conn *ib_conn) rx_wr.num_sge = 1; rx_wr.next = NULL; - atomic_inc(&ib_conn->post_recv_buf_count); + ib_conn->post_recv_buf_count++; ib_ret = ib_post_recv(ib_conn->qp, &rx_wr, &rx_wr_failed); if (ib_ret) { iser_err("ib_post_recv failed ret=%d\n", ib_ret); - atomic_dec(&ib_conn->post_recv_buf_count); + ib_conn->post_recv_buf_count--; } return ib_ret; } @@ -679,11 +679,11 @@ int iser_post_recvm(struct iser_conn *ib_conn, int count) rx_wr--; rx_wr->next = NULL; /* mark end of work requests list */ - atomic_add(count, &ib_conn->post_recv_buf_count); + ib_conn->post_recv_buf_count += count; ib_ret = ib_post_recv(ib_conn->qp, ib_conn->rx_wr, &rx_wr_failed); if (ib_ret) { iser_err("ib_post_recv failed ret=%d\n", ib_ret); - atomic_sub(count, &ib_conn->post_recv_buf_count); + ib_conn->post_recv_buf_count -= count; } else ib_conn->rx_desc_head = my_rx_head; return ib_ret; @@ -778,14 +778,14 @@ static void iser_handle_comp_error(struct iser_desc *desc, if ((char *)desc == ib_conn->login_buf || (rx_first <= rx && rx <= rx_last)) - atomic_dec(&ib_conn->post_recv_buf_count); + ib_conn->post_recv_buf_count--; else { /* type is TX control/command/dataout */ if (desc->type == ISCSI_TX_DATAOUT) kmem_cache_free(ig.desc_cache, desc); atomic_dec(&ib_conn->post_send_buf_count); } - if (atomic_read(&ib_conn->post_recv_buf_count) == 0 && + if (ib_conn->post_recv_buf_count == 0 && atomic_read(&ib_conn->post_send_buf_count) == 0) { /* getting here when the state is UP means that the conn is * * being terminated asynchronously from the iSCSI layer's * From 78ad0a34dc138047529058c5f2265664cb70a052 Mon Sep 17 00:00:00 2001 From: Or Gerlitz Date: Mon, 8 Feb 2010 13:19:21 +0000 Subject: [PATCH 4/9] IB/iser: Use different CQ for send completions Use a different CQ for send completions, where send completions are polled by the interrupt-driven receive completion handler. Therefore, interrupts aren't used for the send CQ. Signed-off-by: Or Gerlitz Signed-off-by: Roland Dreier --- drivers/infiniband/ulp/iser/iscsi_iser.h | 3 +- drivers/infiniband/ulp/iser/iser_verbs.c | 110 +++++++++++++++-------- 2 files changed, 76 insertions(+), 37 deletions(-) diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.h b/drivers/infiniband/ulp/iser/iscsi_iser.h index 4491235340de..a314576be4bf 100644 --- a/drivers/infiniband/ulp/iser/iscsi_iser.h +++ b/drivers/infiniband/ulp/iser/iscsi_iser.h @@ -247,7 +247,8 @@ struct iser_rx_desc { struct iser_device { struct ib_device *ib_device; struct ib_pd *pd; - struct ib_cq *cq; + struct ib_cq *rx_cq; + struct ib_cq *tx_cq; struct ib_mr *mr; struct tasklet_struct cq_tasklet; struct list_head ig_list; /* entry in ig devices list */ diff --git a/drivers/infiniband/ulp/iser/iser_verbs.c b/drivers/infiniband/ulp/iser/iser_verbs.c index 202c00dc6a76..218aa10939a0 100644 --- a/drivers/infiniband/ulp/iser/iser_verbs.c +++ b/drivers/infiniband/ulp/iser/iser_verbs.c @@ -37,9 +37,8 @@ #include "iscsi_iser.h" #define ISCSI_ISER_MAX_CONN 8 -#define ISER_MAX_CQ_LEN ((ISER_QP_MAX_RECV_DTOS + \ - ISER_QP_MAX_REQ_DTOS) * \ - ISCSI_ISER_MAX_CONN) +#define ISER_MAX_RX_CQ_LEN (ISER_QP_MAX_RECV_DTOS * ISCSI_ISER_MAX_CONN) +#define ISER_MAX_TX_CQ_LEN (ISER_QP_MAX_REQ_DTOS * ISCSI_ISER_MAX_CONN) static void iser_cq_tasklet_fn(unsigned long data); static void iser_cq_callback(struct ib_cq *cq, void *cq_context); @@ -67,15 +66,23 @@ static int iser_create_device_ib_res(struct iser_device *device) if (IS_ERR(device->pd)) goto pd_err; - device->cq = ib_create_cq(device->ib_device, + device->rx_cq = ib_create_cq(device->ib_device, iser_cq_callback, iser_cq_event_callback, (void *)device, - ISER_MAX_CQ_LEN, 0); - if (IS_ERR(device->cq)) - goto cq_err; + ISER_MAX_RX_CQ_LEN, 0); + if (IS_ERR(device->rx_cq)) + goto rx_cq_err; - if (ib_req_notify_cq(device->cq, IB_CQ_NEXT_COMP)) + device->tx_cq = ib_create_cq(device->ib_device, + NULL, iser_cq_event_callback, + (void *)device, + ISER_MAX_TX_CQ_LEN, 0); + + if (IS_ERR(device->tx_cq)) + goto tx_cq_err; + + if (ib_req_notify_cq(device->rx_cq, IB_CQ_NEXT_COMP)) goto cq_arm_err; tasklet_init(&device->cq_tasklet, @@ -93,8 +100,10 @@ static int iser_create_device_ib_res(struct iser_device *device) dma_mr_err: tasklet_kill(&device->cq_tasklet); cq_arm_err: - ib_destroy_cq(device->cq); -cq_err: + ib_destroy_cq(device->tx_cq); +tx_cq_err: + ib_destroy_cq(device->rx_cq); +rx_cq_err: ib_dealloc_pd(device->pd); pd_err: iser_err("failed to allocate an IB resource\n"); @@ -112,11 +121,13 @@ static void iser_free_device_ib_res(struct iser_device *device) tasklet_kill(&device->cq_tasklet); (void)ib_dereg_mr(device->mr); - (void)ib_destroy_cq(device->cq); + (void)ib_destroy_cq(device->tx_cq); + (void)ib_destroy_cq(device->rx_cq); (void)ib_dealloc_pd(device->pd); device->mr = NULL; - device->cq = NULL; + device->tx_cq = NULL; + device->rx_cq = NULL; device->pd = NULL; } @@ -179,8 +190,8 @@ static int iser_create_ib_conn_res(struct iser_conn *ib_conn) init_attr.event_handler = iser_qp_event_callback; init_attr.qp_context = (void *)ib_conn; - init_attr.send_cq = device->cq; - init_attr.recv_cq = device->cq; + init_attr.send_cq = device->tx_cq; + init_attr.recv_cq = device->rx_cq; init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS; init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS; init_attr.cap.max_send_sge = MAX_REGD_BUF_VECTOR_LEN; @@ -772,18 +783,8 @@ int iser_post_send(struct iser_desc *tx_desc) static void iser_handle_comp_error(struct iser_desc *desc, struct iser_conn *ib_conn) { - struct iser_rx_desc *rx = (struct iser_rx_desc *)desc; - struct iser_rx_desc *rx_first = ib_conn->rx_descs; - struct iser_rx_desc *rx_last = rx_first + (ISER_QP_MAX_RECV_DTOS - 1); - - if ((char *)desc == ib_conn->login_buf || - (rx_first <= rx && rx <= rx_last)) - ib_conn->post_recv_buf_count--; - else { /* type is TX control/command/dataout */ - if (desc->type == ISCSI_TX_DATAOUT) - kmem_cache_free(ig.desc_cache, desc); - atomic_dec(&ib_conn->post_send_buf_count); - } + if (desc && desc->type == ISCSI_TX_DATAOUT) + kmem_cache_free(ig.desc_cache, desc); if (ib_conn->post_recv_buf_count == 0 && atomic_read(&ib_conn->post_send_buf_count) == 0) { @@ -804,37 +805,74 @@ static void iser_handle_comp_error(struct iser_desc *desc, } } +static int iser_drain_tx_cq(struct iser_device *device) +{ + struct ib_cq *cq = device->tx_cq; + struct ib_wc wc; + struct iser_desc *tx_desc; + struct iser_conn *ib_conn; + int completed_tx = 0; + + while (ib_poll_cq(cq, 1, &wc) == 1) { + tx_desc = (struct iser_desc *) (unsigned long) wc.wr_id; + ib_conn = wc.qp->qp_context; + if (wc.status == IB_WC_SUCCESS) { + if (wc.opcode == IB_WC_SEND) + iser_snd_completion(tx_desc); + else + iser_err("expected opcode %d got %d\n", + IB_WC_SEND, wc.opcode); + } else { + iser_err("tx id %llx status %d vend_err %x\n", + wc.wr_id, wc.status, wc.vendor_err); + atomic_dec(&ib_conn->post_send_buf_count); + iser_handle_comp_error(tx_desc, ib_conn); + } + completed_tx++; + } + return completed_tx; +} + + static void iser_cq_tasklet_fn(unsigned long data) { struct iser_device *device = (struct iser_device *)data; - struct ib_cq *cq = device->cq; + struct ib_cq *cq = device->rx_cq; struct ib_wc wc; - struct iser_desc *desc; + struct iser_rx_desc *desc; unsigned long xfer_len; struct iser_conn *ib_conn; + int completed_tx, completed_rx; + completed_tx = completed_rx = 0; while (ib_poll_cq(cq, 1, &wc) == 1) { - desc = (struct iser_desc *) (unsigned long) wc.wr_id; + desc = (struct iser_rx_desc *) (unsigned long) wc.wr_id; BUG_ON(desc == NULL); ib_conn = wc.qp->qp_context; - if (wc.status == IB_WC_SUCCESS) { if (wc.opcode == IB_WC_RECV) { xfer_len = (unsigned long)wc.byte_len; - iser_rcv_completion((struct iser_rx_desc *)desc, - xfer_len, ib_conn); - } else /* type == ISCSI_TX_CONTROL/SCSI_CMD/DOUT */ - iser_snd_completion(desc); + iser_rcv_completion(desc, xfer_len, ib_conn); + } else + iser_err("expected opcode %d got %d\n", + IB_WC_RECV, wc.opcode); } else { if (wc.status != IB_WC_WR_FLUSH_ERR) - iser_err("id %llx status %d vend_err %x\n", + iser_err("rx id %llx status %d vend_err %x\n", wc.wr_id, wc.status, wc.vendor_err); - iser_handle_comp_error(desc, ib_conn); + ib_conn->post_recv_buf_count--; + iser_handle_comp_error(NULL, ib_conn); } + completed_rx++; + if (!(completed_rx & 63)) + completed_tx += iser_drain_tx_cq(device); } /* #warning "it is assumed here that arming CQ only once its empty" * * " would not cause interrupts to be missed" */ ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); + + completed_tx += iser_drain_tx_cq(device); + iser_dbg("got %d rx %d tx completions\n", completed_rx, completed_tx); } static void iser_cq_callback(struct ib_cq *cq, void *cq_context) From f19624aa92003969ba822cd3c552800965aa530b Mon Sep 17 00:00:00 2001 From: Or Gerlitz Date: Mon, 8 Feb 2010 13:19:56 +0000 Subject: [PATCH 5/9] IB/iser: Simplify send flow/descriptors Simplify and shrink the logic/code used for the send descriptors. Changes include removing struct iser_dto (an unnecessary abstraction), using struct iser_regd_buf only for handling SCSI commands, using dma_sync instead of dma_map/unmap, etc. Signed-off-by: Or Gerlitz Signed-off-by: Roland Dreier --- drivers/infiniband/ulp/iser/iscsi_iser.c | 34 +++- drivers/infiniband/ulp/iser/iscsi_iser.h | 48 ++--- drivers/infiniband/ulp/iser/iser_initiator.c | 176 +++++++------------ drivers/infiniband/ulp/iser/iser_memory.c | 60 ------- drivers/infiniband/ulp/iser/iser_verbs.c | 75 ++------ 5 files changed, 115 insertions(+), 278 deletions(-) diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c index 355470e7e904..331147b71a91 100644 --- a/drivers/infiniband/ulp/iser/iscsi_iser.c +++ b/drivers/infiniband/ulp/iser/iscsi_iser.c @@ -128,6 +128,28 @@ static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) return 0; } +int iser_initialize_task_headers(struct iscsi_task *task, + struct iser_tx_desc *tx_desc) +{ + struct iscsi_iser_conn *iser_conn = task->conn->dd_data; + struct iser_device *device = iser_conn->ib_conn->device; + struct iscsi_iser_task *iser_task = task->dd_data; + u64 dma_addr; + + dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc, + ISER_HEADERS_LEN, DMA_TO_DEVICE); + if (ib_dma_mapping_error(device->ib_device, dma_addr)) + 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; + + iser_task->headers_initialized = 1; + iser_task->iser_conn = iser_conn; + return 0; +} /** * iscsi_iser_task_init - Initialize task * @task: iscsi task @@ -137,17 +159,17 @@ static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) static int iscsi_iser_task_init(struct iscsi_task *task) { - struct iscsi_iser_conn *iser_conn = task->conn->dd_data; struct iscsi_iser_task *iser_task = task->dd_data; + if (!iser_task->headers_initialized) + if (iser_initialize_task_headers(task, &iser_task->desc)) + return -ENOMEM; + /* mgmt task */ - if (!task->sc) { - iser_task->desc.data = task->data; + if (!task->sc) return 0; - } iser_task->command_sent = 0; - iser_task->iser_conn = iser_conn; iser_task_rdma_init(iser_task); return 0; } @@ -675,7 +697,7 @@ static int __init iser_init(void) memset(&ig, 0, sizeof(struct iser_global)); ig.desc_cache = kmem_cache_create("iser_descriptors", - sizeof (struct iser_desc), + sizeof(struct iser_tx_desc), 0, SLAB_HWCACHE_ALIGN, NULL); if (ig.desc_cache == NULL) diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.h b/drivers/infiniband/ulp/iser/iscsi_iser.h index a314576be4bf..269f23f1b6d1 100644 --- a/drivers/infiniband/ulp/iser/iscsi_iser.h +++ b/drivers/infiniband/ulp/iser/iscsi_iser.h @@ -193,28 +193,8 @@ struct iser_regd_buf { struct iser_mem_reg reg; /* memory registration info */ void *virt_addr; struct iser_device *device; /* device->device for dma_unmap */ - u64 dma_addr; /* if non zero, addr for dma_unmap */ enum dma_data_direction direction; /* direction for dma_unmap */ unsigned int data_size; - atomic_t ref_count; /* refcount, freed when dec to 0 */ -}; - -#define MAX_REGD_BUF_VECTOR_LEN 2 - -struct iser_dto { - struct iscsi_iser_task *task; - struct iser_conn *ib_conn; - int notify_enable; - - /* vector of registered buffers */ - unsigned int regd_vector_len; - struct iser_regd_buf *regd[MAX_REGD_BUF_VECTOR_LEN]; - - /* offset into the registered buffer may be specified */ - unsigned int offset[MAX_REGD_BUF_VECTOR_LEN]; - - /* a smaller size may be specified, if 0, then full size is used */ - unsigned int used_sz[MAX_REGD_BUF_VECTOR_LEN]; }; enum iser_desc_type { @@ -223,14 +203,15 @@ enum iser_desc_type { ISCSI_TX_DATAOUT }; -struct iser_desc { +struct iser_tx_desc { struct iser_hdr iser_header; struct iscsi_hdr iscsi_header; - struct iser_regd_buf hdr_regd_buf; - void *data; /* used by RX & TX_CONTROL */ - struct iser_regd_buf data_regd_buf; /* used by RX & TX_CONTROL */ enum iser_desc_type type; - struct iser_dto dto; + u64 dma_addr; + /* sg[0] points to iser/iscsi headers, sg[1] optionally points to either + of immediate data, unsolicited data-out or control (login,text) */ + struct ib_sge tx_sg[2]; + int num_sge; }; #define ISER_RX_PAD_SIZE (256 - (ISER_RX_PAYLOAD_SIZE + \ @@ -287,7 +268,7 @@ struct iscsi_iser_conn { }; struct iscsi_iser_task { - struct iser_desc desc; + struct iser_tx_desc desc; struct iscsi_iser_conn *iser_conn; enum iser_task_status status; int command_sent; /* set if command sent */ @@ -295,6 +276,7 @@ struct iscsi_iser_task { struct iser_regd_buf rdma_regd[ISER_DIRS_NUM];/* regd rdma buf */ struct iser_data_buf data[ISER_DIRS_NUM]; /* orig. data des*/ struct iser_data_buf data_copy[ISER_DIRS_NUM];/* contig. copy */ + int headers_initialized; }; struct iser_page_vec { @@ -346,22 +328,14 @@ void iser_rcv_completion(struct iser_rx_desc *desc, unsigned long dto_xfer_len, struct iser_conn *ib_conn); -void iser_snd_completion(struct iser_desc *desc); +void iser_snd_completion(struct iser_tx_desc *desc, struct iser_conn *ib_conn); void iser_task_rdma_init(struct iscsi_iser_task *task); void iser_task_rdma_finalize(struct iscsi_iser_task *task); -void iser_dto_buffs_release(struct iser_dto *dto); - -int iser_regd_buff_release(struct iser_regd_buf *regd_buf); - void iser_free_rx_descriptors(struct iser_conn *ib_conn); -void iser_reg_single(struct iser_device *device, - struct iser_regd_buf *regd_buf, - enum dma_data_direction direction); - void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *task, enum iser_data_dir cmd_dir); @@ -381,7 +355,7 @@ void iser_unreg_mem(struct iser_mem_reg *mem_reg); int iser_post_recvl(struct iser_conn *ib_conn); int iser_post_recvm(struct iser_conn *ib_conn, int count); -int iser_post_send(struct iser_desc *tx_desc); +int iser_post_send(struct iser_conn *ib_conn, struct iser_tx_desc *tx_desc); int iser_conn_state_comp(struct iser_conn *ib_conn, enum iser_ib_conn_state comp); @@ -392,4 +366,6 @@ int iser_dma_map_task_data(struct iscsi_iser_task *iser_task, enum dma_data_direction dma_dir); void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task); +int iser_initialize_task_headers(struct iscsi_task *task, + struct iser_tx_desc *tx_desc); #endif diff --git a/drivers/infiniband/ulp/iser/iser_initiator.c b/drivers/infiniband/ulp/iser/iser_initiator.c index 3e65a43d2154..3be3a13b5e30 100644 --- a/drivers/infiniband/ulp/iser/iser_initiator.c +++ b/drivers/infiniband/ulp/iser/iser_initiator.c @@ -39,26 +39,6 @@ #include "iscsi_iser.h" - -/* iser_dto_add_regd_buff - increments the reference count for * - * the registered buffer & adds it to the DTO object */ -static void iser_dto_add_regd_buff(struct iser_dto *dto, - struct iser_regd_buf *regd_buf, - unsigned long use_offset, - unsigned long use_size) -{ - int add_idx; - - atomic_inc(®d_buf->ref_count); - - add_idx = dto->regd_vector_len; - dto->regd[add_idx] = regd_buf; - dto->used_sz[add_idx] = use_size; - dto->offset[add_idx] = use_offset; - - dto->regd_vector_len++; -} - /* Register user buffer memory and initialize passive rdma * dto descriptor. Total data size is stored in * iser_task->data[ISER_DIR_IN].data_len @@ -119,9 +99,9 @@ iser_prepare_write_cmd(struct iscsi_task *task, struct iscsi_iser_task *iser_task = task->dd_data; struct iser_regd_buf *regd_buf; int err; - struct iser_dto *send_dto = &iser_task->desc.dto; struct iser_hdr *hdr = &iser_task->desc.iser_header; struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT]; + struct ib_sge *tx_dsg = &iser_task->desc.tx_sg[1]; err = iser_dma_map_task_data(iser_task, buf_out, @@ -160,37 +140,36 @@ iser_prepare_write_cmd(struct iscsi_task *task, if (imm_sz > 0) { iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n", task->itt, imm_sz); - iser_dto_add_regd_buff(send_dto, - regd_buf, - 0, - imm_sz); + tx_dsg->addr = regd_buf->reg.va; + tx_dsg->length = imm_sz; + tx_dsg->lkey = regd_buf->reg.lkey; + iser_task->desc.num_sge = 2; } return 0; } /* creates a new tx descriptor and adds header regd buffer */ -static void iser_create_send_desc(struct iscsi_iser_conn *iser_conn, - struct iser_desc *tx_desc) +static void iser_create_send_desc(struct iser_conn *ib_conn, + struct iser_tx_desc *tx_desc) { - struct iser_regd_buf *regd_hdr = &tx_desc->hdr_regd_buf; - struct iser_dto *send_dto = &tx_desc->dto; + struct iser_device *device = ib_conn->device; - memset(regd_hdr, 0, sizeof(struct iser_regd_buf)); - regd_hdr->device = iser_conn->ib_conn->device; - regd_hdr->virt_addr = tx_desc; /* == &tx_desc->iser_header */ - regd_hdr->data_size = ISER_HEADERS_LEN; - - send_dto->ib_conn = iser_conn->ib_conn; - send_dto->notify_enable = 1; - send_dto->regd_vector_len = 0; + ib_dma_sync_single_for_cpu(device->ib_device, + 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; - iser_dto_add_regd_buff(send_dto, regd_hdr, 0, 0); + tx_desc->num_sge = 1; + + if (tx_desc->tx_sg[0].lkey != device->mr->lkey) { + tx_desc->tx_sg[0].lkey = device->mr->lkey; + iser_dbg("sdesc %p lkey mismatch, fixing\n", tx_desc); + } } + int iser_alloc_rx_descriptors(struct iser_conn *ib_conn) { int i, j; @@ -303,12 +282,12 @@ int iser_send_command(struct iscsi_conn *conn, { struct iscsi_iser_conn *iser_conn = conn->dd_data; struct iscsi_iser_task *iser_task = task->dd_data; - struct iser_dto *send_dto = NULL; unsigned long edtl; int err; struct iser_data_buf *data_buf; struct iscsi_cmd *hdr = (struct iscsi_cmd *)task->hdr; struct scsi_cmnd *sc = task->sc; + struct iser_tx_desc *tx_desc = &iser_task->desc; if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) { iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn); @@ -320,10 +299,8 @@ int iser_send_command(struct iscsi_conn *conn, edtl = ntohl(hdr->data_length); /* build the tx desc regd header and add it to the tx desc dto */ - iser_task->desc.type = ISCSI_TX_SCSI_COMMAND; - send_dto = &iser_task->desc.dto; - send_dto->task = iser_task; - iser_create_send_desc(iser_conn, &iser_task->desc); + tx_desc->type = ISCSI_TX_SCSI_COMMAND; + iser_create_send_desc(iser_conn->ib_conn, tx_desc); if (hdr->flags & ISCSI_FLAG_CMD_READ) data_buf = &iser_task->data[ISER_DIR_IN]; @@ -352,17 +329,13 @@ int iser_send_command(struct iscsi_conn *conn, goto send_command_error; } - iser_reg_single(iser_conn->ib_conn->device, - send_dto->regd[0], DMA_TO_DEVICE); - iser_task->status = ISER_TASK_STATUS_STARTED; - err = iser_post_send(&iser_task->desc); + err = iser_post_send(iser_conn->ib_conn, tx_desc); if (!err) return 0; send_command_error: - iser_dto_buffs_release(send_dto); iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err); return err; } @@ -376,12 +349,14 @@ int iser_send_data_out(struct iscsi_conn *conn, { struct iscsi_iser_conn *iser_conn = conn->dd_data; struct iscsi_iser_task *iser_task = task->dd_data; - struct iser_desc *tx_desc = NULL; - struct iser_dto *send_dto = NULL; + struct iser_tx_desc *tx_desc = NULL; + struct iser_regd_buf *regd_buf; unsigned long buf_offset; unsigned long data_seg_len; uint32_t itt; int err = 0; + struct ib_sge *tx_dsg; + if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) { iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn); @@ -398,28 +373,25 @@ int iser_send_data_out(struct iscsi_conn *conn, iser_dbg("%s itt %d dseg_len %d offset %d\n", __func__,(int)itt,(int)data_seg_len,(int)buf_offset); - tx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO); + tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_NOIO); if (tx_desc == NULL) { iser_err("Failed to alloc desc for post dataout\n"); return -ENOMEM; } tx_desc->type = ISCSI_TX_DATAOUT; + tx_desc->iser_header.flags = ISER_VER; memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr)); - /* build the tx desc regd header and add it to the tx desc dto */ - send_dto = &tx_desc->dto; - send_dto->task = iser_task; - iser_create_send_desc(iser_conn, tx_desc); + /* build the tx desc */ + iser_initialize_task_headers(task, tx_desc); - iser_reg_single(iser_conn->ib_conn->device, - send_dto->regd[0], DMA_TO_DEVICE); - - /* all data was registered for RDMA, we can use the lkey */ - iser_dto_add_regd_buff(send_dto, - &iser_task->rdma_regd[ISER_DIR_OUT], - buf_offset, - data_seg_len); + regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT]; + tx_dsg = &tx_desc->tx_sg[1]; + tx_dsg->addr = regd_buf->reg.va + buf_offset; + tx_dsg->length = data_seg_len; + tx_dsg->lkey = regd_buf->reg.lkey; + tx_desc->num_sge = 2; if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) { iser_err("Offset:%ld & DSL:%ld in Data-Out " @@ -433,12 +405,11 @@ int iser_send_data_out(struct iscsi_conn *conn, itt, buf_offset, data_seg_len); - err = iser_post_send(tx_desc); + err = iser_post_send(iser_conn->ib_conn, tx_desc); if (!err) return 0; send_data_out_error: - iser_dto_buffs_release(send_dto); kmem_cache_free(ig.desc_cache, tx_desc); iser_err("conn %p failed err %d\n",conn, err); return err; @@ -449,11 +420,9 @@ int iser_send_control(struct iscsi_conn *conn, { struct iscsi_iser_conn *iser_conn = conn->dd_data; struct iscsi_iser_task *iser_task = task->dd_data; - struct iser_desc *mdesc = &iser_task->desc; - struct iser_dto *send_dto = NULL; + struct iser_tx_desc *mdesc = &iser_task->desc; unsigned long data_seg_len; - int err; - struct iser_regd_buf *regd_buf; + int err = 0; struct iser_device *device; if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) { @@ -466,27 +435,24 @@ int iser_send_control(struct iscsi_conn *conn, /* build the tx desc regd header and add it to the tx desc dto */ mdesc->type = ISCSI_TX_CONTROL; - send_dto = &mdesc->dto; - send_dto->task = NULL; - iser_create_send_desc(iser_conn, mdesc); + iser_create_send_desc(iser_conn->ib_conn, mdesc); device = iser_conn->ib_conn->device; - iser_reg_single(device, send_dto->regd[0], DMA_TO_DEVICE); - data_seg_len = ntoh24(task->hdr->dlength); if (data_seg_len > 0) { - regd_buf = &mdesc->data_regd_buf; - memset(regd_buf, 0, sizeof(struct iser_regd_buf)); - regd_buf->device = device; - regd_buf->virt_addr = task->data; - regd_buf->data_size = task->data_count; - iser_reg_single(device, regd_buf, - DMA_TO_DEVICE); - iser_dto_add_regd_buff(send_dto, regd_buf, - 0, - data_seg_len); + struct ib_sge *tx_dsg = &mdesc->tx_sg[1]; + if (task != conn->login_task) { + iser_err("data present on non login task!!!\n"); + goto send_control_error; + } + memcpy(iser_conn->ib_conn->login_buf, task->data, + task->data_count); + tx_dsg->addr = iser_conn->ib_conn->login_dma; + tx_dsg->length = data_seg_len; + tx_dsg->lkey = device->mr->lkey; + mdesc->num_sge = 2; } if (task == conn->login_task) { @@ -495,12 +461,11 @@ int iser_send_control(struct iscsi_conn *conn, goto send_control_error; } - err = iser_post_send(mdesc); + err = iser_post_send(iser_conn->ib_conn, mdesc); if (!err) return 0; send_control_error: - iser_dto_buffs_release(send_dto); iser_err("conn %p failed err %d\n",conn, err); return err; } @@ -584,21 +549,20 @@ void iser_rcv_completion(struct iser_rx_desc *rx_desc, } } -void iser_snd_completion(struct iser_desc *tx_desc) +void iser_snd_completion(struct iser_tx_desc *tx_desc, + struct iser_conn *ib_conn) { - struct iser_dto *dto = &tx_desc->dto; - struct iser_conn *ib_conn = dto->ib_conn; struct iscsi_iser_conn *iser_conn = ib_conn->iser_conn; struct iscsi_conn *conn = iser_conn->iscsi_conn; struct iscsi_task *task; int resume_tx = 0; + struct iser_device *device = ib_conn->device; - iser_dbg("Initiator, Data sent dto=0x%p\n", dto); - - iser_dto_buffs_release(dto); - - if (tx_desc->type == ISCSI_TX_DATAOUT) + if (tx_desc->type == ISCSI_TX_DATAOUT) { + ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr, + ISER_HEADERS_LEN, DMA_TO_DEVICE); kmem_cache_free(ig.desc_cache, tx_desc); + } if (atomic_read(&iser_conn->ib_conn->post_send_buf_count) == ISER_QP_MAX_REQ_DTOS) @@ -639,7 +603,6 @@ void iser_task_rdma_init(struct iscsi_iser_task *iser_task) void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task) { - int deferred; int is_rdma_aligned = 1; struct iser_regd_buf *regd; @@ -657,32 +620,17 @@ void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task) if (iser_task->dir[ISER_DIR_IN]) { regd = &iser_task->rdma_regd[ISER_DIR_IN]; - deferred = iser_regd_buff_release(regd); - if (deferred) { - iser_err("%d references remain for BUF-IN rdma reg\n", - atomic_read(®d->ref_count)); - } + if (regd->reg.is_fmr) + iser_unreg_mem(®d->reg); } if (iser_task->dir[ISER_DIR_OUT]) { regd = &iser_task->rdma_regd[ISER_DIR_OUT]; - deferred = iser_regd_buff_release(regd); - if (deferred) { - iser_err("%d references remain for BUF-OUT rdma reg\n", - atomic_read(®d->ref_count)); - } + if (regd->reg.is_fmr) + iser_unreg_mem(®d->reg); } /* if the data was unaligned, it was already unmapped and then copied */ if (is_rdma_aligned) iser_dma_unmap_task_data(iser_task); } - -void iser_dto_buffs_release(struct iser_dto *dto) -{ - int i; - - for (i = 0; i < dto->regd_vector_len; i++) - iser_regd_buff_release(dto->regd[i]); -} - diff --git a/drivers/infiniband/ulp/iser/iser_memory.c b/drivers/infiniband/ulp/iser/iser_memory.c index 274c883ef3ea..5e32e8f1edf5 100644 --- a/drivers/infiniband/ulp/iser/iser_memory.c +++ b/drivers/infiniband/ulp/iser/iser_memory.c @@ -40,62 +40,6 @@ #define ISER_KMALLOC_THRESHOLD 0x20000 /* 128K - kmalloc limit */ -/** - * Decrements the reference count for the - * registered buffer & releases it - * - * returns 0 if released, 1 if deferred - */ -int iser_regd_buff_release(struct iser_regd_buf *regd_buf) -{ - struct ib_device *dev; - - if ((atomic_read(®d_buf->ref_count) == 0) || - atomic_dec_and_test(®d_buf->ref_count)) { - /* if we used the dma mr, unreg is just NOP */ - if (regd_buf->reg.is_fmr) - iser_unreg_mem(®d_buf->reg); - - if (regd_buf->dma_addr) { - dev = regd_buf->device->ib_device; - ib_dma_unmap_single(dev, - regd_buf->dma_addr, - regd_buf->data_size, - regd_buf->direction); - } - /* else this regd buf is associated with task which we */ - /* dma_unmap_single/sg later */ - return 0; - } else { - iser_dbg("Release deferred, regd.buff: 0x%p\n", regd_buf); - return 1; - } -} - -/** - * iser_reg_single - fills registered buffer descriptor with - * registration information - */ -void iser_reg_single(struct iser_device *device, - struct iser_regd_buf *regd_buf, - enum dma_data_direction direction) -{ - u64 dma_addr; - - dma_addr = ib_dma_map_single(device->ib_device, - regd_buf->virt_addr, - regd_buf->data_size, direction); - BUG_ON(ib_dma_mapping_error(device->ib_device, dma_addr)); - - regd_buf->reg.lkey = device->mr->lkey; - regd_buf->reg.len = regd_buf->data_size; - regd_buf->reg.va = dma_addr; - regd_buf->reg.is_fmr = 0; - - regd_buf->dma_addr = dma_addr; - regd_buf->direction = direction; -} - /** * iser_start_rdma_unaligned_sg */ @@ -474,9 +418,5 @@ int iser_reg_rdma_mem(struct iscsi_iser_task *iser_task, return err; } } - - /* take a reference on this regd buf such that it will not be released * - * (eg in send dto completion) before we get the scsi response */ - atomic_inc(®d_buf->ref_count); return 0; } diff --git a/drivers/infiniband/ulp/iser/iser_verbs.c b/drivers/infiniband/ulp/iser/iser_verbs.c index 218aa10939a0..18cf65f092e8 100644 --- a/drivers/infiniband/ulp/iser/iser_verbs.c +++ b/drivers/infiniband/ulp/iser/iser_verbs.c @@ -194,7 +194,7 @@ static int iser_create_ib_conn_res(struct iser_conn *ib_conn) init_attr.recv_cq = device->rx_cq; init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS; init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS; - init_attr.cap.max_send_sge = MAX_REGD_BUF_VECTOR_LEN; + init_attr.cap.max_send_sge = 2; init_attr.cap.max_recv_sge = 1; init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; init_attr.qp_type = IB_QPT_RC; @@ -701,86 +701,37 @@ int iser_post_recvm(struct iser_conn *ib_conn, int count) } -/** - * iser_dto_to_iov - builds IOV from a dto descriptor - */ -static void iser_dto_to_iov(struct iser_dto *dto, struct ib_sge *iov, int iov_len) -{ - int i; - struct ib_sge *sge; - struct iser_regd_buf *regd_buf; - - if (dto->regd_vector_len > iov_len) { - iser_err("iov size %d too small for posting dto of len %d\n", - iov_len, dto->regd_vector_len); - BUG(); - } - - for (i = 0; i < dto->regd_vector_len; i++) { - sge = &iov[i]; - regd_buf = dto->regd[i]; - - sge->addr = regd_buf->reg.va; - sge->length = regd_buf->reg.len; - sge->lkey = regd_buf->reg.lkey; - - if (dto->used_sz[i] > 0) /* Adjust size */ - sge->length = dto->used_sz[i]; - - /* offset and length should not exceed the regd buf length */ - if (sge->length + dto->offset[i] > regd_buf->reg.len) { - iser_err("Used len:%ld + offset:%d, exceed reg.buf.len:" - "%ld in dto:0x%p [%d], va:0x%08lX\n", - (unsigned long)sge->length, dto->offset[i], - (unsigned long)regd_buf->reg.len, dto, i, - (unsigned long)sge->addr); - BUG(); - } - - sge->addr += dto->offset[i]; /* Adjust offset */ - } -} - - /** * iser_start_send - Initiate a Send DTO operation * * returns 0 on success, -1 on failure */ -int iser_post_send(struct iser_desc *tx_desc) +int iser_post_send(struct iser_conn *ib_conn, struct iser_tx_desc *tx_desc) { - int ib_ret, ret_val = 0; + int ib_ret; struct ib_send_wr send_wr, *send_wr_failed; - struct ib_sge iov[MAX_REGD_BUF_VECTOR_LEN]; - struct iser_conn *ib_conn; - struct iser_dto *dto = &tx_desc->dto; - ib_conn = dto->ib_conn; - - iser_dto_to_iov(dto, iov, MAX_REGD_BUF_VECTOR_LEN); + ib_dma_sync_single_for_device(ib_conn->device->ib_device, + tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); send_wr.next = NULL; send_wr.wr_id = (unsigned long)tx_desc; - send_wr.sg_list = iov; - send_wr.num_sge = dto->regd_vector_len; + 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 = dto->notify_enable ? IB_SEND_SIGNALED : 0; + send_wr.send_flags = IB_SEND_SIGNALED; atomic_inc(&ib_conn->post_send_buf_count); ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed); if (ib_ret) { - iser_err("Failed to start SEND DTO, dto: 0x%p, IOV len: %d\n", - dto, dto->regd_vector_len); iser_err("ib_post_send failed, ret:%d\n", ib_ret); atomic_dec(&ib_conn->post_send_buf_count); - ret_val = -1; } - - return ret_val; + return ib_ret; } -static void iser_handle_comp_error(struct iser_desc *desc, +static void iser_handle_comp_error(struct iser_tx_desc *desc, struct iser_conn *ib_conn) { if (desc && desc->type == ISCSI_TX_DATAOUT) @@ -809,16 +760,16 @@ static int iser_drain_tx_cq(struct iser_device *device) { struct ib_cq *cq = device->tx_cq; struct ib_wc wc; - struct iser_desc *tx_desc; + struct iser_tx_desc *tx_desc; struct iser_conn *ib_conn; int completed_tx = 0; while (ib_poll_cq(cq, 1, &wc) == 1) { - tx_desc = (struct iser_desc *) (unsigned long) wc.wr_id; + tx_desc = (struct iser_tx_desc *) (unsigned long) wc.wr_id; ib_conn = wc.qp->qp_context; if (wc.status == IB_WC_SUCCESS) { if (wc.opcode == IB_WC_SEND) - iser_snd_completion(tx_desc); + iser_snd_completion(tx_desc, ib_conn); else iser_err("expected opcode %d got %d\n", IB_WC_SEND, wc.opcode); From 528f4e8c8341706a354ff96daf615e678e9b296f Mon Sep 17 00:00:00 2001 From: Or Gerlitz Date: Mon, 8 Feb 2010 13:20:43 +0000 Subject: [PATCH 6/9] IB/iser: Use atomic allocations Two minor flows in iSER's data path still use allocations; move them to be atomic as a preperation step towards moving to use libiscsi passthrough mode. Signed-off-by: Or Gerlitz Signed-off-by: Roland Dreier --- drivers/infiniband/ulp/iser/iser_initiator.c | 2 +- drivers/infiniband/ulp/iser/iser_memory.c | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/infiniband/ulp/iser/iser_initiator.c b/drivers/infiniband/ulp/iser/iser_initiator.c index 3be3a13b5e30..e27eb8757650 100644 --- a/drivers/infiniband/ulp/iser/iser_initiator.c +++ b/drivers/infiniband/ulp/iser/iser_initiator.c @@ -373,7 +373,7 @@ int iser_send_data_out(struct iscsi_conn *conn, iser_dbg("%s itt %d dseg_len %d offset %d\n", __func__,(int)itt,(int)data_seg_len,(int)buf_offset); - tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_NOIO); + tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC); if (tx_desc == NULL) { iser_err("Failed to alloc desc for post dataout\n"); return -ENOMEM; diff --git a/drivers/infiniband/ulp/iser/iser_memory.c b/drivers/infiniband/ulp/iser/iser_memory.c index 5e32e8f1edf5..fb88d6896b67 100644 --- a/drivers/infiniband/ulp/iser/iser_memory.c +++ b/drivers/infiniband/ulp/iser/iser_memory.c @@ -53,10 +53,10 @@ static int iser_start_rdma_unaligned_sg(struct iscsi_iser_task *iser_task, unsigned long cmd_data_len = data->data_len; if (cmd_data_len > ISER_KMALLOC_THRESHOLD) - mem = (void *)__get_free_pages(GFP_NOIO, + mem = (void *)__get_free_pages(GFP_ATOMIC, ilog2(roundup_pow_of_two(cmd_data_len)) - PAGE_SHIFT); else - mem = kmalloc(cmd_data_len, GFP_NOIO); + mem = kmalloc(cmd_data_len, GFP_ATOMIC); if (mem == NULL) { iser_err("Failed to allocate mem size %d %d for copying sglist\n", From aae3c995ff74a183d15207436d383942485b2edd Mon Sep 17 00:00:00 2001 From: Or Gerlitz Date: Mon, 8 Feb 2010 13:21:18 +0000 Subject: [PATCH 7/9] IB/iser: Remove unnecessary connection checks Remove unnecessary checks for the IB connection state and for QP overflow, as conn state changes are reported by iSER to libiscsi and handled there. QP overflow is theoretically possible only when unsolicited data-outs are used; anyway it's being checked and handled by HW drivers. Signed-off-by: Or Gerlitz Signed-off-by: Roland Dreier --- drivers/infiniband/ulp/iser/iscsi_iser.h | 3 -- drivers/infiniband/ulp/iser/iser_initiator.c | 38 -------------------- drivers/infiniband/ulp/iser/iser_verbs.c | 11 ------ 3 files changed, 52 deletions(-) diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.h b/drivers/infiniband/ulp/iser/iscsi_iser.h index 269f23f1b6d1..036934cdcb92 100644 --- a/drivers/infiniband/ulp/iser/iscsi_iser.h +++ b/drivers/infiniband/ulp/iser/iscsi_iser.h @@ -357,9 +357,6 @@ int iser_post_recvl(struct iser_conn *ib_conn); int iser_post_recvm(struct iser_conn *ib_conn, int count); int iser_post_send(struct iser_conn *ib_conn, struct iser_tx_desc *tx_desc); -int iser_conn_state_comp(struct iser_conn *ib_conn, - enum iser_ib_conn_state comp); - int iser_dma_map_task_data(struct iscsi_iser_task *iser_task, struct iser_data_buf *data, enum iser_data_dir iser_dir, diff --git a/drivers/infiniband/ulp/iser/iser_initiator.c b/drivers/infiniband/ulp/iser/iser_initiator.c index e27eb8757650..27450eebd1e4 100644 --- a/drivers/infiniband/ulp/iser/iser_initiator.c +++ b/drivers/infiniband/ulp/iser/iser_initiator.c @@ -260,20 +260,6 @@ int iser_conn_set_full_featured_mode(struct iscsi_conn *conn) return 0; } -static int -iser_check_xmit(struct iscsi_conn *conn, void *task) -{ - struct iscsi_iser_conn *iser_conn = conn->dd_data; - - if (atomic_read(&iser_conn->ib_conn->post_send_buf_count) == - ISER_QP_MAX_REQ_DTOS) { - iser_dbg("%ld can't xmit task %p\n",jiffies,task); - return -ENOBUFS; - } - return 0; -} - - /** * iser_send_command - send command PDU */ @@ -289,13 +275,6 @@ int iser_send_command(struct iscsi_conn *conn, struct scsi_cmnd *sc = task->sc; struct iser_tx_desc *tx_desc = &iser_task->desc; - if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) { - iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn); - return -EPERM; - } - if (iser_check_xmit(conn, task)) - return -ENOBUFS; - edtl = ntohl(hdr->data_length); /* build the tx desc regd header and add it to the tx desc dto */ @@ -357,15 +336,6 @@ int iser_send_data_out(struct iscsi_conn *conn, int err = 0; struct ib_sge *tx_dsg; - - if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) { - iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn); - return -EPERM; - } - - if (iser_check_xmit(conn, task)) - return -ENOBUFS; - itt = (__force uint32_t)hdr->itt; data_seg_len = ntoh24(hdr->dlength); buf_offset = ntohl(hdr->offset); @@ -425,14 +395,6 @@ int iser_send_control(struct iscsi_conn *conn, int err = 0; struct iser_device *device; - if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) { - iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn); - return -EPERM; - } - - if (iser_check_xmit(conn, task)) - return -ENOBUFS; - /* build the tx desc regd header and add it to the tx desc dto */ mdesc->type = ISCSI_TX_CONTROL; iser_create_send_desc(iser_conn->ib_conn, mdesc); diff --git a/drivers/infiniband/ulp/iser/iser_verbs.c b/drivers/infiniband/ulp/iser/iser_verbs.c index 18cf65f092e8..308d17bb5146 100644 --- a/drivers/infiniband/ulp/iser/iser_verbs.c +++ b/drivers/infiniband/ulp/iser/iser_verbs.c @@ -300,17 +300,6 @@ static void iser_device_try_release(struct iser_device *device) mutex_unlock(&ig.device_list_mutex); } -int iser_conn_state_comp(struct iser_conn *ib_conn, - enum iser_ib_conn_state comp) -{ - int ret; - - spin_lock_bh(&ib_conn->lock); - ret = (ib_conn->state == comp); - spin_unlock_bh(&ib_conn->lock); - return ret; -} - static int iser_conn_state_comp_exch(struct iser_conn *ib_conn, enum iser_ib_conn_state comp, enum iser_ib_conn_state exch) From 962b4b528ba87c8d837bb04794a1918c7de631cd Mon Sep 17 00:00:00 2001 From: Or Gerlitz Date: Mon, 8 Feb 2010 13:22:34 +0000 Subject: [PATCH 8/9] IB/iser: Use libiscsi passthrough mode libiscsi passthrough mode invokes the transport xmit calls directly without first going through an internal queue, unlike the other mode, which uses a queue and a xmitworker thread. Now that the "cant_sleep" prerequisite of iscsi_host_alloc is met, move to use it. Handling xmit errors is now done by the passthrough flow of libiscsi. Since the queue/worker aren't used in this mode, the code that schedules the xmitworker is removed. Signed-off-by: Or Gerlitz Reviewed-by: Mike Christie Signed-off-by: Roland Dreier --- drivers/infiniband/ulp/iser/iscsi_iser.c | 11 +++-------- drivers/infiniband/ulp/iser/iser_initiator.c | 12 ------------ 2 files changed, 3 insertions(+), 20 deletions(-) diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c index 331147b71a91..71237f8f78f7 100644 --- a/drivers/infiniband/ulp/iser/iscsi_iser.c +++ b/drivers/infiniband/ulp/iser/iscsi_iser.c @@ -190,7 +190,7 @@ iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) { int error = 0; - iser_dbg("task deq [cid %d itt 0x%x]\n", conn->id, task->itt); + iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); error = iser_send_control(conn, task); @@ -200,9 +200,6 @@ iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) * - if yes, the task is recycled at iscsi_complete_pdu * - if no, the task is recycled at iser_snd_completion */ - if (error && error != -ENOBUFS) - iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); - return error; } @@ -254,7 +251,7 @@ iscsi_iser_task_xmit(struct iscsi_task *task) task->imm_count, task->unsol_r2t.data_length); } - iser_dbg("task deq [cid %d itt 0x%x]\n", + iser_dbg("ctask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); /* Send the cmd PDU */ @@ -270,8 +267,6 @@ iscsi_iser_task_xmit(struct iscsi_task *task) error = iscsi_iser_task_xmit_unsol_data(conn, task); iscsi_iser_task_xmit_exit: - if (error && error != -ENOBUFS) - iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); return error; } @@ -423,7 +418,7 @@ iscsi_iser_session_create(struct iscsi_endpoint *ep, struct Scsi_Host *shost; struct iser_conn *ib_conn; - shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 1); + shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0); if (!shost) return NULL; shost->transportt = iscsi_iser_scsi_transport; diff --git a/drivers/infiniband/ulp/iser/iser_initiator.c b/drivers/infiniband/ulp/iser/iser_initiator.c index 27450eebd1e4..f447ace89cb1 100644 --- a/drivers/infiniband/ulp/iser/iser_initiator.c +++ b/drivers/infiniband/ulp/iser/iser_initiator.c @@ -514,10 +514,7 @@ void iser_rcv_completion(struct iser_rx_desc *rx_desc, void iser_snd_completion(struct iser_tx_desc *tx_desc, struct iser_conn *ib_conn) { - struct iscsi_iser_conn *iser_conn = ib_conn->iser_conn; - struct iscsi_conn *conn = iser_conn->iscsi_conn; struct iscsi_task *task; - int resume_tx = 0; struct iser_device *device = ib_conn->device; if (tx_desc->type == ISCSI_TX_DATAOUT) { @@ -526,17 +523,8 @@ void iser_snd_completion(struct iser_tx_desc *tx_desc, kmem_cache_free(ig.desc_cache, tx_desc); } - if (atomic_read(&iser_conn->ib_conn->post_send_buf_count) == - ISER_QP_MAX_REQ_DTOS) - resume_tx = 1; - atomic_dec(&ib_conn->post_send_buf_count); - if (resume_tx) { - iser_dbg("%ld resuming tx\n",jiffies); - iscsi_conn_queue_work(conn); - } - if (tx_desc->type == ISCSI_TX_CONTROL) { /* this arithmetic is legal by libiscsi dd_data allocation */ task = (void *) ((long)(void *)tx_desc - From 88ec415772144f4fc4a50b123bb6200de686898d Mon Sep 17 00:00:00 2001 From: Or Gerlitz Date: Mon, 8 Feb 2010 13:23:11 +0000 Subject: [PATCH 9/9] IB/iser: Remove redundant locking from iser scsi command response flow Currently the iSER receive completion flow takes the session lock twice. Optimize it to avoid the first one by letting iser_task_rdma_finalize() be called only from the cleanup_task callback invoked by iscsi_free_task, thus reducing the contention on the session lock between the scsi command submission to the scsi command completion flows. Signed-off-by: Or Gerlitz Reviewed-by: Mike Christie Signed-off-by: Roland Dreier --- drivers/infiniband/ulp/iser/iser_initiator.c | 25 -------------------- 1 file changed, 25 deletions(-) diff --git a/drivers/infiniband/ulp/iser/iser_initiator.c b/drivers/infiniband/ulp/iser/iser_initiator.c index f447ace89cb1..0b9ef0716588 100644 --- a/drivers/infiniband/ulp/iser/iser_initiator.c +++ b/drivers/infiniband/ulp/iser/iser_initiator.c @@ -440,10 +440,7 @@ void iser_rcv_completion(struct iser_rx_desc *rx_desc, struct iser_conn *ib_conn) { struct iscsi_iser_conn *conn = ib_conn->iser_conn; - struct iscsi_task *task; - struct iscsi_iser_task *iser_task; struct iscsi_hdr *hdr; - unsigned char opcode; u64 rx_dma; int rx_buflen, outstanding, count, err; @@ -464,28 +461,6 @@ void iser_rcv_completion(struct iser_rx_desc *rx_desc, iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode, hdr->itt, (int)(rx_xfer_len - ISER_HEADERS_LEN)); - opcode = hdr->opcode & ISCSI_OPCODE_MASK; - - if (opcode == ISCSI_OP_SCSI_CMD_RSP) { - spin_lock(&conn->iscsi_conn->session->lock); - task = iscsi_itt_to_ctask(conn->iscsi_conn, hdr->itt); - if (task) - __iscsi_get_task(task); - spin_unlock(&conn->iscsi_conn->session->lock); - - if (!task) - iser_err("itt can't be matched to task!!! " - "conn %p opcode %d itt %d\n", - conn->iscsi_conn, opcode, hdr->itt); - else { - iser_task = task->dd_data; - iser_dbg("itt %d task %p\n",hdr->itt, task); - iser_task->status = ISER_TASK_STATUS_COMPLETED; - iser_task_rdma_finalize(iser_task); - iscsi_put_task(task); - } - } - iscsi_iser_recv(conn->iscsi_conn, hdr, rx_desc->data, rx_xfer_len - ISER_HEADERS_LEN);