[dpdk-stable] patch 'net/bnx2x: fix packet drop' has been queued to LTS release 18.11.3

[Kevin Traynor <ktraynor@redhat.com>]

Hi,

FYI, your patch has been queued to LTS release 18.11.3

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 06/27/19. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://github.com/kevintraynor/dpdk-stable-queue

This queued commit can be viewed at:
https://github.com/kevintraynor/dpdk-stable-queue/commit/47f54bcc2eef1be1bbbda926d68847b4697c659a

Thanks.

Kevin Traynor

---
From 47f54bcc2eef1be1bbbda926d68847b4697c659a Mon Sep 17 00:00:00 2001
From: Shahed Shaikh <shshaikh@marvell.com>
Date: Tue, 4 Jun 2019 11:53:48 -0700
Subject: [PATCH] net/bnx2x: fix packet drop

[ upstream commit 08a6e472c3d7833ebe6cee0e1b3c601141a269ed ]

Patch "8bd31421c593 ("net/bnx2x: fix ramrod timeout")"
introduced a regression where sc->scan_fp flags is
set for unexpectedly long time. So the slow path completion
handler flow is run unnecessarily which walks over receive
descriptor ring of fast path and drops the data packets while looking
for slow path completion descriptor out of fast path ring.

This issue is seen under heavy traffic with link events happening
in background.

Fixes: 8bd31421c593 ("net/bnx2x: fix ramrod timeout")

Signed-off-by: Shahed Shaikh <shshaikh@marvell.com>
Acked-by: Rasesh Mody <rmody@marvell.com>
---
 drivers/net/bnx2x/bnx2x.c    | 2 ++
 drivers/net/bnx2x/ecore_sp.c | 4 ----
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/bnx2x/bnx2x.c b/drivers/net/bnx2x/bnx2x.c
index 3e705c7a1..0698b1a8a 100644
--- a/drivers/net/bnx2x/bnx2x.c
+++ b/drivers/net/bnx2x/bnx2x.c
@@ -4573,4 +4573,6 @@ static void bnx2x_handle_fp_tq(struct bnx2x_fastpath *fp)
 	}
 
+	/* Assuming we have completed slow path completion, clear the flag */
+	rte_atomic32_set(&sc->scan_fp, 0);
 	bnx2x_ack_sb(sc, fp->igu_sb_id, USTORM_ID,
 		   le16toh(fp->fp_hc_idx), IGU_INT_ENABLE, 1);
diff --git a/drivers/net/bnx2x/ecore_sp.c b/drivers/net/bnx2x/ecore_sp.c
index 43194095b..5ac22e725 100644
--- a/drivers/net/bnx2x/ecore_sp.c
+++ b/drivers/net/bnx2x/ecore_sp.c
@@ -292,8 +292,4 @@ static int ecore_state_wait(struct bnx2x_softc *sc, int state,
 
 	ECORE_MSG(sc, "waiting for state to become %d", state);
-	/* being over protective to remind bnx2x_intr_legacy() to
-	 * process RAMROD
-	 */
-	rte_atomic32_set(&sc->scan_fp, 1);
 
 	ECORE_MIGHT_SLEEP();
-- 
2.20.1

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2019-06-24 16:18:56.118911885 +0100
+++ 0020-net-bnx2x-fix-packet-drop.patch	2019-06-24 16:18:55.010431719 +0100
@@ -1 +1 @@
-From 08a6e472c3d7833ebe6cee0e1b3c601141a269ed Mon Sep 17 00:00:00 2001
+From 47f54bcc2eef1be1bbbda926d68847b4697c659a Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 08a6e472c3d7833ebe6cee0e1b3c601141a269ed ]
+
@@ -17 +18,0 @@
-Cc: stable@dpdk.org
@@ -27 +28 @@
-index e771e40cb..5f353a7ef 100644
+index 3e705c7a1..0698b1a8a 100644