RDMA/cxgb4: Don't wakeup threads for MPAv2

Don't wakeup threads blocked in rdma_init/rdma_fini if we are on
MPAv2, and want to retry connection with MPAv1.

Stop ep-timer on getting MPA version mismatch, before doing the
abort_connection - in process_mpa_request.

Take care to stop ep-timer in error paths for process_mpa_request.

Signed-off-by: Vipul Pandya <vipul@chelsio.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

diff --git a/drivers/infiniband/hw/cxgb4/cm.c b/drivers/infiniband/hw/cxgb4/cm.c
index 88933af..06c3a52 100644 (file)
--- a/drivers/infiniband/hw/cxgb4/cm.c
+++ b/drivers/infiniband/hw/cxgb4/cm.c
@@ -1300,11 +1300,13 @@ static void process_mpa_request(struct c4iw_ep *ep, struct sk_buff *skb)
        if (mpa->revision > mpa_rev) {
                printk(KERN_ERR MOD "%s MPA version mismatch. Local = %d,"
                       " Received = %d\n", __func__, mpa_rev, mpa->revision);
+               stop_ep_timer(ep);
                abort_connection(ep, skb, GFP_KERNEL);
                return;
        }
 
        if (memcmp(mpa->key, MPA_KEY_REQ, sizeof(mpa->key))) {
+               stop_ep_timer(ep);
                abort_connection(ep, skb, GFP_KERNEL);
                return;
        }
@@ -1315,6 +1317,7 @@ static void process_mpa_request(struct c4iw_ep *ep, struct sk_buff *skb)
         * Fail if there's too much private data.
         */
        if (plen > MPA_MAX_PRIVATE_DATA) {
+               stop_ep_timer(ep);
                abort_connection(ep, skb, GFP_KERNEL);
                return;
        }
@@ -1323,6 +1326,7 @@ static void process_mpa_request(struct c4iw_ep *ep, struct sk_buff *skb)
         * If plen does not account for pkt size
         */
        if (ep->mpa_pkt_len > (sizeof(*mpa) + plen)) {
+               stop_ep_timer(ep);
                abort_connection(ep, skb, GFP_KERNEL);
                return;
        }
@@ -3286,8 +3290,14 @@ static int peer_abort_intr(struct c4iw_dev *dev, struct sk_buff *skb)
 
        /*
         * Wake up any threads in rdma_init() or rdma_fini().
+        * However, if we are on MPAv2 and want to retry with MPAv1
+        * then, don't wake up yet.
         */
-       c4iw_wake_up(&ep->com.wr_wait, -ECONNRESET);
+       if (mpa_rev == 2 && !ep->tried_with_mpa_v1) {
+               if (ep->com.state != MPA_REQ_SENT)
+                       c4iw_wake_up(&ep->com.wr_wait, -ECONNRESET);
+       } else
+               c4iw_wake_up(&ep->com.wr_wait, -ECONNRESET);
        sched(dev, skb);
        return 0;
 }