From 88ec415772144f4fc4a50b123bb6200de686898d Mon Sep 17 00:00:00 2001 From: Or Gerlitz Date: Mon, 8 Feb 2010 13:23:11 +0000 Subject: 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(-) (limited to 'drivers') 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); -- cgit v1.2.3