Patch "iw_cxgb4: do not send RX_DATA_ACK CPLs after close/abort" has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    iw_cxgb4: do not send RX_DATA_ACK CPLs after close/abort

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     iw_cxgb4-do-not-send-rx_data_ack-cpls-after-close-abort.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Wed Aug  9 10:32:06 PDT 2017
From: Steve Wise <swise@opengridcomputing.com>
Date: Thu, 22 Dec 2016 07:40:37 -0800
Subject: iw_cxgb4: do not send RX_DATA_ACK CPLs after close/abort

From: Steve Wise <swise@opengridcomputing.com>


[ Upstream commit 3bcf96e0183f5c863657cb6ae9adad307a0f6071 ]

Function rx_data(), which handles ingress CPL_RX_DATA messages, was
always sending an RX_DATA_ACK with the goal of updating the credits.
However, if the RDMA connection is moved out of FPDU mode abruptly,
then it is possible for iw_cxgb4 to process queued RX_DATA CPLs after HW
has aborted the connection.  These CPLs should not trigger RX_DATA_ACKS.
If they do, HW can see a READ after DELETE of the DB_LE hash entry for
the tid and post a LE_DB HashTblMemCrcError.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/infiniband/hw/cxgb4/cm.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/drivers/infiniband/hw/cxgb4/cm.c
+++ b/drivers/infiniband/hw/cxgb4/cm.c
@@ -1804,20 +1804,21 @@ static int rx_data(struct c4iw_dev *dev,
 	skb_trim(skb, dlen);
 	mutex_lock(&ep->com.mutex);
 
-	/* update RX credits */
-	update_rx_credits(ep, dlen);
-
 	switch (ep->com.state) {
 	case MPA_REQ_SENT:
+		update_rx_credits(ep, dlen);
 		ep->rcv_seq += dlen;
 		disconnect = process_mpa_reply(ep, skb);
 		break;
 	case MPA_REQ_WAIT:
+		update_rx_credits(ep, dlen);
 		ep->rcv_seq += dlen;
 		disconnect = process_mpa_request(ep, skb);
 		break;
 	case FPDU_MODE: {
 		struct c4iw_qp_attributes attrs;
+
+		update_rx_credits(ep, dlen);
 		BUG_ON(!ep->com.qp);
 		if (status)
 			pr_err("%s Unexpected streaming data." \


Patches currently in stable-queue which might be from swise@opengridcomputing.com are

queue-4.9/iw_cxgb4-do-not-send-rx_data_ack-cpls-after-close-abort.patch