[dpdk-stable] patch 'net/bnxt: limit Rx representor packets per poll' has been queued to stable release 20.11.1

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to stable release 20.11.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 02/07/21. 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/bluca/dpdk-stable

This queued commit can be viewed at:
https://github.com/bluca/dpdk-stable/commit/fe18437e3489fa06bdecf616fa62e14b00e6d698

Thanks.

Luca Boccassi

---
>From fe18437e3489fa06bdecf616fa62e14b00e6d698 Mon Sep 17 00:00:00 2001
From: Lance Richardson <lance.richardson at broadcom.com>
Date: Mon, 14 Dec 2020 13:53:52 -0500
Subject: [PATCH] net/bnxt: limit Rx representor packets per poll

[ upstream commit f0beaf802145e21e1ce60d4ca2724436b70c316e ]

Without some limit on the number of packets transferred from the
HW ring to the representor ring per burst receive call, an entire ring's
worth of packets can be transferred. This can break assumptions
about ring indices (index on return could be identical to the index
on entry, which is assumed to mean that no packets were processed),
and can result in representor packets being dropped unnecessarily
due to representor ring overflow.

Fix by limiting the number of representor packets transferred per
poll to requested burst size.

Fixes: 6dc83230b43b ("net/bnxt: support port representor data path")

Signed-off-by: Lance Richardson <lance.richardson at broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde at broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur at broadcom.com>
---
 drivers/net/bnxt/bnxt_rxr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/bnxt/bnxt_rxr.c b/drivers/net/bnxt/bnxt_rxr.c
index af1774844a..cadc598cf2 100644
--- a/drivers/net/bnxt/bnxt_rxr.c
+++ b/drivers/net/bnxt/bnxt_rxr.c
@@ -891,7 +891,7 @@ uint16_t bnxt_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 		}
 
 		raw_cons = NEXT_RAW_CMP(raw_cons);
-		if (nb_rx_pkts == nb_pkts || evt)
+		if (nb_rx_pkts == nb_pkts || nb_rep_rx_pkts == nb_pkts || evt)
 			break;
 		/* Post some Rx buf early in case of larger burst processing */
 		if (nb_rx_pkts == BNXT_RX_POST_THRESH)
-- 
2.29.2

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2021-02-05 11:18:32.362865018 +0000
+++ 0069-net-bnxt-limit-Rx-representor-packets-per-poll.patch	2021-02-05 11:18:28.834691645 +0000
@@ -1 +1 @@
-From f0beaf802145e21e1ce60d4ca2724436b70c316e Mon Sep 17 00:00:00 2001
+From fe18437e3489fa06bdecf616fa62e14b00e6d698 Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit f0beaf802145e21e1ce60d4ca2724436b70c316e ]
+
@@ -18 +19,0 @@
-Cc: stable at dpdk.org
@@ -28 +29 @@
-index 445e6150d1..e2d388e69f 100644
+index af1774844a..cadc598cf2 100644
@@ -31 +32 @@
-@@ -901,7 +901,7 @@ uint16_t bnxt_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
+@@ -891,7 +891,7 @@ uint16_t bnxt_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,