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authorRalph Campbell <ralph.campbell@qlogic.com>2007-06-18 14:24:44 -0700
committerRoland Dreier <rolandd@cisco.com>2007-07-09 20:12:26 -0700
commitd781b129f1e8b3e2f369d8035a61a5233832e65c (patch)
tree7ff0bfbcd2e32a4693fa2007b773a7ca87968464 /drivers/infiniband/hw/ipath/ipath_verbs.h
parent30d149ab58cc3ed8e4bc9c4dc45bebbed0e84b6e (diff)
IB/ipath: Duplicate RDMA reads can cause responder to NAK inappropriately
A duplicate RDMA read request can fool the responder into NAKing a new RDMA read request because the responder wasn't keeping track of whether the queue of RDMA read requests had been sent at least once. For example, requester sends 4 2K byte RDMA read requests, times out, and resends the first, then sees the 4 responses, then sends a 5th RDMA read or atomic operation. The responder sees the 4 requests, sends 4 responses, sees the resent 1st request, rewinds the queue, then sees the 5th request but thinks the queue is full and that the requester is invalidly sending a 5th new request. Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband/hw/ipath/ipath_verbs.h')
-rw-r--r--drivers/infiniband/hw/ipath/ipath_verbs.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_verbs.h b/drivers/infiniband/hw/ipath/ipath_verbs.h
index 088b837ebea..458f8227fa3 100644
--- a/drivers/infiniband/hw/ipath/ipath_verbs.h
+++ b/drivers/infiniband/hw/ipath/ipath_verbs.h
@@ -321,6 +321,7 @@ struct ipath_sge_state {
*/
struct ipath_ack_entry {
u8 opcode;
+ u8 sent;
u32 psn;
union {
struct ipath_sge_state rdma_sge;