patch 'examples/l3fwd: fix Rx over not ready port' has been queued to stable release 21.11.7

[Kevin Traynor]

Hi,

FYI, your patch has been queued to stable release 21.11.7

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 03/13/24. 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

This queued commit can be viewed at:
https://github.com/kevintraynor/dpdk-stable/commit/1e1f6d551be99b66b7d2e0a937a6e8a7aa8f1f1d

Thanks.

Kevin

---
>From 1e1f6d551be99b66b7d2e0a937a6e8a7aa8f1f1d Mon Sep 17 00:00:00 2001
From: Konstantin Ananyev <konstantin.ananyev at huawei.com>
Date: Fri, 1 Mar 2024 16:39:31 +0000
Subject: [PATCH] examples/l3fwd: fix Rx over not ready port

[ upstream commit 495709d32be87cb962c55917b19ad7d4489cde3e ]

Running l3fwd in event mode with SW eventdev, service cores
can start RX before main thread is finished with PMD installation.
to reproduce:
./dpdk-l3fwd --lcores=49,51 -n 6 -a ca:00.0 -s 0x8000000000000 \
--vdev event_sw0 -- \
-L -P -p 1  --mode eventdev --eventq-sched=ordered \
--rule_ipv4=test/l3fwd_lpm_v4_u1.cfg --rule_ipv6=test/l3fwd_lpm_v6_u1.cfg \
--no-numa

At init stage user will most likely see the error message like that:
ETHDEV: lcore 51 called rx_pkt_burst for not ready port 0
0: ./dpdk-l3fwd (rte_dump_stack+0x1f) [15de723]
...
9: ./dpdk-l3fwd (eal_thread_loop+0x5a2) [15c1324]
...

And then all depends how luck/unlucky you are.
If there are some actual packet in HW RX queue, then the app will most
likely crash, otherwise it might survive.
As error message suggests, the problem is that services are started
before main thread finished with NIC setup and initialization.
The suggested fix moves services startup after NIC setup phase.

Bugzilla ID: 1390
Fixes: 8bd537e9c6cf ("examples/l3fwd: add service core setup based on caps")

Signed-off-by: Konstantin Ananyev <konstantin.v.ananyev at yandex.ru>
Signed-off-by: Konstantin Ananyev <konstantin.ananyev at huawei.com>
Acked-by: Pavan Nikhilesh <pbhagavatula at marvell.com>
---
 examples/l3fwd/main.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/examples/l3fwd/main.c b/examples/l3fwd/main.c
index 59436bb589..32cc45647e 100644
--- a/examples/l3fwd/main.c
+++ b/examples/l3fwd/main.c
@@ -1460,5 +1460,4 @@ main(int argc, char **argv)
 		else
 			l3fwd_lkp.main_loop = evt_rsrc->ops.lpm_event_loop;
-		l3fwd_event_service_setup();
 	} else
 		l3fwd_poll_resource_setup();
@@ -1491,4 +1490,9 @@ main(int argc, char **argv)
 	}
 
+#ifdef RTE_LIB_EVENTDEV
+	if (evt_rsrc->enabled)
+		l3fwd_event_service_setup();
+#endif
+
 	printf("\n");
 
-- 
2.43.2

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2024-03-08 13:47:50.001070998 +0000
+++ 0034-examples-l3fwd-fix-Rx-over-not-ready-port.patch	2024-03-08 13:47:49.043686738 +0000
@@ -1 +1 @@
-From 495709d32be87cb962c55917b19ad7d4489cde3e Mon Sep 17 00:00:00 2001
+From 1e1f6d551be99b66b7d2e0a937a6e8a7aa8f1f1d Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 495709d32be87cb962c55917b19ad7d4489cde3e ]
+
@@ -31 +32,0 @@
-Cc: stable at dpdk.org
@@ -41 +42 @@
-index 3bf28aec0c..d4fb5d1971 100644
+index 59436bb589..32cc45647e 100644
@@ -44 +45 @@
-@@ -1578,5 +1578,4 @@ main(int argc, char **argv)
+@@ -1460,5 +1460,4 @@ main(int argc, char **argv)
@@ -49,2 +50,2 @@
- #endif
-@@ -1610,4 +1609,9 @@ main(int argc, char **argv)
+ 		l3fwd_poll_resource_setup();
+@@ -1491,4 +1490,9 @@ main(int argc, char **argv)