From 78ad0a34dc138047529058c5f2265664cb70a052 Mon Sep 17 00:00:00 2001 From: Or Gerlitz Date: Mon, 8 Feb 2010 13:19:21 +0000 Subject: [PATCH] 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) -- GitLab