cnic: Fix race conditions with firmware

During iSCSI connection terminations, if the target is also terminating
at about the same time, the firmware may not complete the driver's
request to close or reset the connection.  This is fixed by handling
other events (instead of the expected completion event) as an indication
that the driver's request has been rejected.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/cnic.c b/drivers/net/cnic.c
index 5c0a669dfa5f3ba803e873cf5058263a9d2be7b6..ea7245c5fb69bacc0f72bdd9186bbe4e49e5689a 100644 (file)
--- a/drivers/net/cnic.c
+++ b/drivers/net/cnic.c
@@ -3767,7 +3767,13 @@ static void cnic_cm_process_kcqe(struct cnic_dev *dev, struct kcqe *kcqe)
                break;
 
        case L4_KCQE_OPCODE_VALUE_CLOSE_RECEIVED:
-               cnic_cm_upcall(cp, csk, opcode);
+               /* after we already sent CLOSE_REQ */
+               if (test_bit(CNIC_F_BNX2X_CLASS, &dev->flags) &&
+                   !test_bit(SK_F_OFFLD_COMPLETE, &csk->flags) &&
+                   csk->state == L4_KCQE_OPCODE_VALUE_CLOSE_COMP)
+                       cp->close_conn(csk, L4_KCQE_OPCODE_VALUE_RESET_COMP);
+               else
+                       cnic_cm_upcall(cp, csk, opcode);
                break;
        }
        csk_put(csk);
@@ -3821,12 +3827,14 @@ static int cnic_ready_to_close(struct cnic_sock *csk, u32 opcode)
        }
 
        /* 1. If event opcode matches the expected event in csk->state
-        * 2. If the expected event is CLOSE_COMP, we accept any event
+        * 2. If the expected event is CLOSE_COMP or RESET_COMP, we accept any
+        *    event
         * 3. If the expected event is 0, meaning the connection was never
         *    never established, we accept the opcode from cm_abort.
         */
        if (opcode == csk->state || csk->state == 0 ||
-           csk->state == L4_KCQE_OPCODE_VALUE_CLOSE_COMP) {
+           csk->state == L4_KCQE_OPCODE_VALUE_CLOSE_COMP ||
+           csk->state == L4_KCQE_OPCODE_VALUE_RESET_COMP) {
                if (!test_and_set_bit(SK_F_CLOSING, &csk->flags)) {
                        if (csk->state == 0)
                                csk->state = opcode;