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Message-Id: <20190206172444.21997-4-rajur@chelsio.com>
Date: Wed, 6 Feb 2019 22:54:44 +0530
From: Raju Rangoju <rajur@...lsio.com>
To: jgg@...lanox.com, davem@...emloft.net, linux-rdma@...r.kernel.org
Cc: netdev@...r.kernel.org, swise@...ngridcomputing.com,
rajur@...lsio.com
Subject: [PATCH 3/3] iw_cxgb4: fix srqidx leak during connection abort
When an application aborts the connection by moving QP from RTS to
ERROR, then iw_cxgb4's modify_rc_qp() RTS->ERROR logic sets the
*srqidxp to 0 via t4_set_wq_in_error(&qhp->wq, 0), and aborts the
connection by calling c4iw_ep_disconnect().
c4iw_ep_disconnect() does the following:
1. sends up a close_complete_upcall(ep, -ECONNRESET) to libcxgb4.
2. sends abort request CPL to hw.
But, since the close_complete_upcall() is sent before sending the
ABORT_REQ to hw, libcxgb4 would fail to release the srqidx if the
connection holds one. Because, the srqidx is passed up to libcxgb4
only after corresponding ABORT_RPL is processed by kernel in
abort_rpl().
This patch handle the corner-case by moving the call to
close_complete_upcall() from c4iw_ep_disconnect() to abort_rpl().
So that libcxgb4 is notified about the -ECONNRESET only after
abort_rpl(), and libcxgb4 can relinquish the srqidx properly.
Signed-off-by: Raju Rangoju <rajur@...lsio.com>
---
drivers/infiniband/hw/cxgb4/cm.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/infiniband/hw/cxgb4/cm.c b/drivers/infiniband/hw/cxgb4/cm.c
index 7aca5d73c19e..f45044d8de4d 100644
--- a/drivers/infiniband/hw/cxgb4/cm.c
+++ b/drivers/infiniband/hw/cxgb4/cm.c
@@ -1941,8 +1941,10 @@ static int abort_rpl(struct c4iw_dev *dev, struct sk_buff *skb)
}
mutex_unlock(&ep->com.mutex);
- if (release)
+ if (release) {
+ close_complete_upcall(ep, -ECONNRESET);
release_ep_resources(ep);
+ }
c4iw_put_ep(&ep->com);
return 0;
}
@@ -3675,7 +3677,6 @@ int c4iw_ep_disconnect(struct c4iw_ep *ep, int abrupt, gfp_t gfp)
if (close) {
if (abrupt) {
set_bit(EP_DISC_ABORT, &ep->com.history);
- close_complete_upcall(ep, -ECONNRESET);
ret = send_abort(ep);
} else {
set_bit(EP_DISC_CLOSE, &ep->com.history);
--
2.13.0
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