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iw_cxgb4: do not send RX_DATA_ACK CPLs after close/abort 

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>
This commit is contained in:
Steve Wise 2016-12-22 07:40:37 -08:00 committed by Doug Ledford
parent c12a67fec8
commit 3bcf96e018
1 changed files with 4 additions and 3 deletions
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7
drivers/infiniband/hw/cxgb4/cm.c
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@ -1804,20 +1804,21 @@ static int rx_data(struct c4iw_dev *dev, struct sk_buff *skb)
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." \