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 <ogerlitz@voltaire.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Or Gerlitz
Roland Dreier
parent
1cef465985
commit
bcc60c381d
4 changed files with 235 additions and 176 deletions
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@ -283,7 +283,7 @@ iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
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* due to issues with the login code re iser sematics
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* this not set in iscsi_conn_setup - FIXME
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*/
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conn->max_recv_dlength = 128;
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conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN;
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iser_conn = conn->dd_data;
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conn->dd_data = iser_conn;
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@ -102,9 +102,9 @@
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#define ISER_MAX_TX_MISC_PDUS 6 /* NOOP_OUT(2), TEXT(1), *
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* SCSI_TMFUNC(2), LOGOUT(1) */
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#define ISER_QP_MAX_RECV_DTOS (ISCSI_DEF_XMIT_CMDS_MAX + \
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ISER_MAX_RX_MISC_PDUS + \
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ISER_MAX_TX_MISC_PDUS)
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#define ISER_QP_MAX_RECV_DTOS (ISCSI_DEF_XMIT_CMDS_MAX)
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#define ISER_MIN_POSTED_RX (ISCSI_DEF_XMIT_CMDS_MAX >> 2)
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/* the max TX (send) WR supported by the iSER QP is defined by *
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* max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect *
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@ -132,6 +132,12 @@ struct iser_hdr {
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__be64 read_va;
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} __attribute__((packed));
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/* Constant PDU lengths calculations */
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#define ISER_HEADERS_LEN (sizeof(struct iser_hdr) + sizeof(struct iscsi_hdr))
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#define ISER_RECV_DATA_SEG_LEN 128
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#define ISER_RX_PAYLOAD_SIZE (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN)
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#define ISER_RX_LOGIN_SIZE (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)
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/* Length of an object name string */
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#define ISER_OBJECT_NAME_SIZE 64
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@ -212,7 +218,6 @@ struct iser_dto {
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};
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enum iser_desc_type {
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ISCSI_RX,
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ISCSI_TX_CONTROL ,
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ISCSI_TX_SCSI_COMMAND,
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ISCSI_TX_DATAOUT
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@ -228,6 +233,17 @@ struct iser_desc {
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struct iser_dto dto;
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};
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#define ISER_RX_PAD_SIZE (256 - (ISER_RX_PAYLOAD_SIZE + \
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sizeof(u64) + sizeof(struct ib_sge)))
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struct iser_rx_desc {
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struct iser_hdr iser_header;
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struct iscsi_hdr iscsi_header;
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char data[ISER_RECV_DATA_SEG_LEN];
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u64 dma_addr;
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struct ib_sge rx_sg;
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char pad[ISER_RX_PAD_SIZE];
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} __attribute__((packed));
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struct iser_device {
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struct ib_device *ib_device;
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struct ib_pd *pd;
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@ -256,6 +272,12 @@ struct iser_conn {
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struct iser_page_vec *page_vec; /* represents SG to fmr maps*
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* maps serialized as tx is*/
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struct list_head conn_list; /* entry in ig conn list */
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char *login_buf;
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u64 login_dma;
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unsigned int rx_desc_head;
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struct iser_rx_desc *rx_descs;
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struct ib_recv_wr rx_wr[ISER_MIN_POSTED_RX];
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};
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struct iscsi_iser_conn {
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@ -319,8 +341,9 @@ void iser_conn_put(struct iser_conn *ib_conn);
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void iser_conn_terminate(struct iser_conn *ib_conn);
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void iser_rcv_completion(struct iser_desc *desc,
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unsigned long dto_xfer_len);
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void iser_rcv_completion(struct iser_rx_desc *desc,
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unsigned long dto_xfer_len,
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struct iser_conn *ib_conn);
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void iser_snd_completion(struct iser_desc *desc);
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@ -332,6 +355,8 @@ void iser_dto_buffs_release(struct iser_dto *dto);
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int iser_regd_buff_release(struct iser_regd_buf *regd_buf);
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void iser_free_rx_descriptors(struct iser_conn *ib_conn);
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void iser_reg_single(struct iser_device *device,
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struct iser_regd_buf *regd_buf,
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enum dma_data_direction direction);
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@ -353,7 +378,8 @@ int iser_reg_page_vec(struct iser_conn *ib_conn,
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void iser_unreg_mem(struct iser_mem_reg *mem_reg);
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int iser_post_recv(struct iser_desc *rx_desc);
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int iser_post_recvl(struct iser_conn *ib_conn);
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int iser_post_recvm(struct iser_conn *ib_conn, int count);
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int iser_post_send(struct iser_desc *tx_desc);
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int iser_conn_state_comp(struct iser_conn *ib_conn,
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@ -39,9 +39,6 @@
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#include "iscsi_iser.h"
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/* Constant PDU lengths calculations */
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#define ISER_TOTAL_HEADERS_LEN (sizeof (struct iser_hdr) + \
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sizeof (struct iscsi_hdr))
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/* iser_dto_add_regd_buff - increments the reference count for *
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* the registered buffer & adds it to the DTO object */
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@ -172,78 +169,6 @@ iser_prepare_write_cmd(struct iscsi_task *task,
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return 0;
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}
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/**
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* iser_post_receive_control - allocates, initializes and posts receive DTO.
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*/
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static int iser_post_receive_control(struct iscsi_conn *conn)
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{
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struct iscsi_iser_conn *iser_conn = conn->dd_data;
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struct iser_desc *rx_desc;
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struct iser_regd_buf *regd_hdr;
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struct iser_regd_buf *regd_data;
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struct iser_dto *recv_dto = NULL;
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struct iser_device *device = iser_conn->ib_conn->device;
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int rx_data_size, err = 0;
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rx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO);
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if (rx_desc == NULL) {
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iser_err("Failed to alloc desc for post recv\n");
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return -ENOMEM;
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}
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rx_desc->type = ISCSI_RX;
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/* for the login sequence we must support rx of upto 8K; login is done
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* after conn create/bind (connect) and conn stop/bind (reconnect),
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* what's common for both schemes is that the connection is not started
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*/
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if (conn->c_stage != ISCSI_CONN_STARTED)
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rx_data_size = ISCSI_DEF_MAX_RECV_SEG_LEN;
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else /* FIXME till user space sets conn->max_recv_dlength correctly */
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rx_data_size = 128;
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rx_desc->data = kmalloc(rx_data_size, GFP_NOIO);
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if (rx_desc->data == NULL) {
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iser_err("Failed to alloc data buf for post recv\n");
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err = -ENOMEM;
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goto post_rx_kmalloc_failure;
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}
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recv_dto = &rx_desc->dto;
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recv_dto->ib_conn = iser_conn->ib_conn;
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recv_dto->regd_vector_len = 0;
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regd_hdr = &rx_desc->hdr_regd_buf;
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memset(regd_hdr, 0, sizeof(struct iser_regd_buf));
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regd_hdr->device = device;
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regd_hdr->virt_addr = rx_desc; /* == &rx_desc->iser_header */
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regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN;
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iser_reg_single(device, regd_hdr, DMA_FROM_DEVICE);
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iser_dto_add_regd_buff(recv_dto, regd_hdr, 0, 0);
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regd_data = &rx_desc->data_regd_buf;
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memset(regd_data, 0, sizeof(struct iser_regd_buf));
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regd_data->device = device;
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regd_data->virt_addr = rx_desc->data;
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regd_data->data_size = rx_data_size;
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iser_reg_single(device, regd_data, DMA_FROM_DEVICE);
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iser_dto_add_regd_buff(recv_dto, regd_data, 0, 0);
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err = iser_post_recv(rx_desc);
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if (!err)
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return 0;
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/* iser_post_recv failed */
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iser_dto_buffs_release(recv_dto);
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kfree(rx_desc->data);
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post_rx_kmalloc_failure:
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kmem_cache_free(ig.desc_cache, rx_desc);
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return err;
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}
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/* creates a new tx descriptor and adds header regd buffer */
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static void iser_create_send_desc(struct iscsi_iser_conn *iser_conn,
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struct iser_desc *tx_desc)
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@ -254,7 +179,7 @@ static void iser_create_send_desc(struct iscsi_iser_conn *iser_conn,
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memset(regd_hdr, 0, sizeof(struct iser_regd_buf));
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regd_hdr->device = iser_conn->ib_conn->device;
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regd_hdr->virt_addr = tx_desc; /* == &tx_desc->iser_header */
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regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN;
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regd_hdr->data_size = ISER_HEADERS_LEN;
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send_dto->ib_conn = iser_conn->ib_conn;
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send_dto->notify_enable = 1;
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@ -266,6 +191,72 @@ static void iser_create_send_desc(struct iscsi_iser_conn *iser_conn,
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iser_dto_add_regd_buff(send_dto, regd_hdr, 0, 0);
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}
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int iser_alloc_rx_descriptors(struct iser_conn *ib_conn)
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{
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int i, j;
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u64 dma_addr;
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struct iser_rx_desc *rx_desc;
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struct ib_sge *rx_sg;
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struct iser_device *device = ib_conn->device;
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ib_conn->rx_descs = kmalloc(ISER_QP_MAX_RECV_DTOS *
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sizeof(struct iser_rx_desc), GFP_KERNEL);
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if (!ib_conn->rx_descs)
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goto rx_desc_alloc_fail;
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rx_desc = ib_conn->rx_descs;
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for (i = 0; i < ISER_QP_MAX_RECV_DTOS; i++, rx_desc++) {
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dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc,
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ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
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if (ib_dma_mapping_error(device->ib_device, dma_addr))
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goto rx_desc_dma_map_failed;
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rx_desc->dma_addr = dma_addr;
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rx_sg = &rx_desc->rx_sg;
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rx_sg->addr = rx_desc->dma_addr;
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rx_sg->length = ISER_RX_PAYLOAD_SIZE;
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rx_sg->lkey = device->mr->lkey;
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}
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ib_conn->rx_desc_head = 0;
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return 0;
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rx_desc_dma_map_failed:
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rx_desc = ib_conn->rx_descs;
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for (j = 0; j < i; j++, rx_desc++)
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ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
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ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
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kfree(ib_conn->rx_descs);
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ib_conn->rx_descs = NULL;
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rx_desc_alloc_fail:
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iser_err("failed allocating rx descriptors / data buffers\n");
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return -ENOMEM;
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}
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void iser_free_rx_descriptors(struct iser_conn *ib_conn)
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{
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int i;
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struct iser_rx_desc *rx_desc;
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struct iser_device *device = ib_conn->device;
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if (ib_conn->login_buf) {
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ib_dma_unmap_single(device->ib_device, ib_conn->login_dma,
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ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE);
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kfree(ib_conn->login_buf);
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}
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if (!ib_conn->rx_descs)
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return;
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rx_desc = ib_conn->rx_descs;
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for (i = 0; i < ISER_QP_MAX_RECV_DTOS; i++, rx_desc++)
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ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
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ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
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kfree(ib_conn->rx_descs);
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}
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/**
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* iser_conn_set_full_featured_mode - (iSER API)
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*/
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@ -273,27 +264,20 @@ int iser_conn_set_full_featured_mode(struct iscsi_conn *conn)
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{
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struct iscsi_iser_conn *iser_conn = conn->dd_data;
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int i;
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/* no need to keep it in a var, we are after login so if this should
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* be negotiated, by now the result should be available here */
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int initial_post_recv_bufs_num = ISER_MAX_RX_MISC_PDUS;
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iser_dbg("Initially post: %d\n", initial_post_recv_bufs_num);
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iser_dbg("Initially post: %d\n", ISER_MIN_POSTED_RX);
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/* Check that there is no posted recv or send buffers left - */
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/* they must be consumed during the login phase */
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BUG_ON(atomic_read(&iser_conn->ib_conn->post_recv_buf_count) != 0);
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BUG_ON(atomic_read(&iser_conn->ib_conn->post_send_buf_count) != 0);
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if (iser_alloc_rx_descriptors(iser_conn->ib_conn))
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return -ENOMEM;
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/* Initial post receive buffers */
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for (i = 0; i < initial_post_recv_bufs_num; i++) {
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if (iser_post_receive_control(conn) != 0) {
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iser_err("Failed to post recv bufs at:%d conn:0x%p\n",
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i, conn);
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return -ENOMEM;
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}
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}
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iser_dbg("Posted %d post recv bufs, conn:0x%p\n", i, conn);
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if (iser_post_recvm(iser_conn->ib_conn, ISER_MIN_POSTED_RX))
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return -ENOMEM;
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return 0;
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}
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@ -321,7 +305,7 @@ int iser_send_command(struct iscsi_conn *conn,
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struct iscsi_iser_task *iser_task = task->dd_data;
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struct iser_dto *send_dto = NULL;
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unsigned long edtl;
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int err = 0;
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int err;
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struct iser_data_buf *data_buf;
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struct iscsi_cmd *hdr = (struct iscsi_cmd *)task->hdr;
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struct scsi_cmnd *sc = task->sc;
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@ -371,12 +355,6 @@ int iser_send_command(struct iscsi_conn *conn,
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iser_reg_single(iser_conn->ib_conn->device,
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send_dto->regd[0], DMA_TO_DEVICE);
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if (iser_post_receive_control(conn) != 0) {
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iser_err("post_recv failed!\n");
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err = -ENOMEM;
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goto send_command_error;
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}
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iser_task->status = ISER_TASK_STATUS_STARTED;
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err = iser_post_send(&iser_task->desc);
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@ -474,7 +452,7 @@ int iser_send_control(struct iscsi_conn *conn,
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struct iser_desc *mdesc = &iser_task->desc;
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struct iser_dto *send_dto = NULL;
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unsigned long data_seg_len;
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int err = 0;
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int err;
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struct iser_regd_buf *regd_buf;
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struct iser_device *device;
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@ -511,10 +489,10 @@ int iser_send_control(struct iscsi_conn *conn,
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data_seg_len);
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}
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if (iser_post_receive_control(conn) != 0) {
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iser_err("post_rcv_buff failed!\n");
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err = -ENOMEM;
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goto send_control_error;
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if (task == conn->login_task) {
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err = iser_post_recvl(iser_conn->ib_conn);
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if (err)
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goto send_control_error;
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}
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err = iser_post_send(mdesc);
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@ -530,27 +508,34 @@ int iser_send_control(struct iscsi_conn *conn,
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/**
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* iser_rcv_dto_completion - recv DTO completion
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*/
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void iser_rcv_completion(struct iser_desc *rx_desc,
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unsigned long dto_xfer_len)
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void iser_rcv_completion(struct iser_rx_desc *rx_desc,
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unsigned long rx_xfer_len,
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struct iser_conn *ib_conn)
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{
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struct iser_dto *dto = &rx_desc->dto;
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struct iscsi_iser_conn *conn = dto->ib_conn->iser_conn;
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struct iscsi_iser_conn *conn = ib_conn->iser_conn;
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struct iscsi_task *task;
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struct iscsi_iser_task *iser_task;
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struct iscsi_hdr *hdr;
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char *rx_data = NULL;
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int rx_data_len = 0;
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unsigned char opcode;
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u64 rx_dma;
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int rx_buflen, outstanding, count, err;
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/* differentiate between login to all other PDUs */
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if ((char *)rx_desc == ib_conn->login_buf) {
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rx_dma = ib_conn->login_dma;
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rx_buflen = ISER_RX_LOGIN_SIZE;
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} else {
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rx_dma = rx_desc->dma_addr;
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rx_buflen = ISER_RX_PAYLOAD_SIZE;
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}
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ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, rx_dma,
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rx_buflen, DMA_FROM_DEVICE);
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hdr = &rx_desc->iscsi_header;
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iser_dbg("op 0x%x itt 0x%x\n", hdr->opcode,hdr->itt);
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||||
|
||||
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)
|
||||
|
|
|
|||
|
|
@ -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" *
|
||||
|
|
|
|||
Loading…
Reference in a new issue