iser-target: Use ib_drain_qp

Now the rdma core offers a QP draining service in v4.6-rc1,
use it instead of our own.

Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Reported-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c
index 60b30d3..411e446 100644 (file)
--- a/drivers/infiniband/ulp/isert/ib_isert.c
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -63,7 +63,6 @@ isert_rdma_accept(struct isert_conn *isert_conn);
 struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np);
 
 static void isert_release_work(struct work_struct *work);
-static void isert_wait4flush(struct isert_conn *isert_conn);
 static void isert_recv_done(struct ib_cq *cq, struct ib_wc *wc);
 static void isert_send_done(struct ib_cq *cq, struct ib_wc *wc);
 static void isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc);
@@ -141,7 +140,7 @@ isert_create_qp(struct isert_conn *isert_conn,
        attr.qp_context = isert_conn;
        attr.send_cq = comp->cq;
        attr.recv_cq = comp->cq;
-       attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
+       attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS + 1;
        attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1;
        attr.cap.max_send_sge = device->ib_device->attrs.max_sge;
        isert_conn->max_sge = min(device->ib_device->attrs.max_sge,
@@ -887,7 +886,7 @@ isert_disconnected_handler(struct rdma_cm_id *cma_id,
                break;
        case ISER_CONN_UP:
                isert_conn_terminate(isert_conn);
-               isert_wait4flush(isert_conn);
+               ib_drain_qp(isert_conn->qp);
                isert_handle_unbound_conn(isert_conn);
                break;
        case ISER_CONN_BOUND:
@@ -3213,36 +3212,6 @@ isert_wait4cmds(struct iscsi_conn *conn)
        }
 }
 
-static void
-isert_beacon_done(struct ib_cq *cq, struct ib_wc *wc)
-{
-       struct isert_conn *isert_conn = wc->qp->qp_context;
-
-       isert_print_wc(wc, "beacon");
-
-       isert_info("conn %p completing wait_comp_err\n", isert_conn);
-       complete(&isert_conn->wait_comp_err);
-}
-
-static void
-isert_wait4flush(struct isert_conn *isert_conn)
-{
-       struct ib_recv_wr *bad_wr;
-       static struct ib_cqe cqe = { .done = isert_beacon_done };
-
-       isert_info("conn %p\n", isert_conn);
-
-       init_completion(&isert_conn->wait_comp_err);
-       isert_conn->beacon.wr_cqe = &cqe;
-       /* post an indication that all flush errors were consumed */
-       if (ib_post_recv(isert_conn->qp, &isert_conn->beacon, &bad_wr)) {
-               isert_err("conn %p failed to post beacon", isert_conn);
-               return;
-       }
-
-       wait_for_completion(&isert_conn->wait_comp_err);
-}
-
 /**
  * isert_put_unsol_pending_cmds() - Drop commands waiting for
  *     unsolicitate dataout
@@ -3288,7 +3257,7 @@ static void isert_wait_conn(struct iscsi_conn *conn)
        isert_conn_terminate(isert_conn);
        mutex_unlock(&isert_conn->mutex);
 
-       isert_wait4flush(isert_conn);
+       ib_drain_qp(isert_conn->qp);
        isert_put_unsol_pending_cmds(conn);
        isert_wait4cmds(conn);
        isert_wait4logout(isert_conn);
@@ -3300,7 +3269,7 @@ static void isert_free_conn(struct iscsi_conn *conn)
 {
        struct isert_conn *isert_conn = conn->context;
 
-       isert_wait4flush(isert_conn);
+       ib_drain_qp(isert_conn->qp);
        isert_put_conn(isert_conn);
 }
 

diff --git a/drivers/infiniband/ulp/isert/ib_isert.h b/drivers/infiniband/ulp/isert/ib_isert.h
index 192788a..147900c 100644 (file)
--- a/drivers/infiniband/ulp/isert/ib_isert.h
+++ b/drivers/infiniband/ulp/isert/ib_isert.h
@@ -209,14 +209,12 @@ struct isert_conn {
        struct ib_qp            *qp;
        struct isert_device     *device;
        struct mutex            mutex;
-       struct completion       wait_comp_err;
        struct kref             kref;
        struct list_head        fr_pool;
        int                     fr_pool_size;
        /* lock to protect fastreg pool */
        spinlock_t              pool_lock;
        struct work_struct      release_work;
-       struct ib_recv_wr       beacon;
        bool                    logout_posted;
        bool                    snd_w_inv;
 };