patch 'eal/linux: report uevent socket overrun' has been queued to stable release 24.11.9

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to stable release 24.11.9

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 10/29/26. 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/9eca229ffd26ea0cd96e19c923a73df27089f2fa

Thanks.

Luca Boccassi

---
>From 9eca229ffd26ea0cd96e19c923a73df27089f2fa Mon Sep 17 00:00:00 2001
From: Stephen Hemminger <stephen at networkplumber.org>
Date: Wed, 19 Aug 2026 12:08:52 -0700
Subject: [PATCH] eal/linux: report uevent socket overrun

[ upstream commit 31adc8bdb94bdc687279ae8d96e63672f5e7f313 ]

Make uevent handler handle case where kernel netlink receive
buffer is overrun. If this happens the DPDK device state
will potentially be out of sync, but better not to give up.

The code already handles the case of kernel sending a zero
length message; it just ignores it.

Fixes: 0d0f478d0483 ("eal/linux: add uevent parse and process")

Reported-by: Randy Tice <rtice at cisco.com>
Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>
Reviewed-by: Long Li <longli at microsoft.com>
---
 lib/eal/linux/eal_dev.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/lib/eal/linux/eal_dev.c b/lib/eal/linux/eal_dev.c
index a5800fc5adf..b85ac95a0e5 100644
--- a/lib/eal/linux/eal_dev.c
+++ b/lib/eal/linux/eal_dev.c
@@ -265,11 +265,20 @@ dev_uev_handler(__rte_unused void *param)
 
 	ret = recv(rte_intr_fd_get(intr_handle), buf, EAL_UEV_MSG_LEN,
 		   MSG_DONTWAIT);
-	if (ret < 0 && errno == EAGAIN)
-		return;
-	else if (ret <= 0) {
-		/* connection is closed or broken, can not up again. */
-		EAL_LOG(ERR, "uevent socket connection is broken.");
+	if (ret < 0) {
+		/* transient error */
+		if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR)
+			return;
+
+		/* kernel netlink messages lost */
+		if (errno == ENOBUFS) {
+			EAL_LOG(NOTICE, "kernel receive buffer overrun");
+			return;
+		}
+
+		EAL_LOG(ERR, "unexpected error on uevent recv: %s",
+			strerror(errno));
+
 		rte_eal_alarm_set(1, dev_delayed_unregister, NULL);
 		return;
 	}
-- 
2.47.3

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2026-10-27 11:43:53.939012615 +0000
+++ 0004-eal-linux-report-uevent-socket-overrun.patch	2026-10-27 11:43:53.494058830 +0000
@@ -1 +1 @@
-From 31adc8bdb94bdc687279ae8d96e63672f5e7f313 Mon Sep 17 00:00:00 2001
+From 9eca229ffd26ea0cd96e19c923a73df27089f2fa Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 31adc8bdb94bdc687279ae8d96e63672f5e7f313 ]
+
@@ -14 +15,0 @@
-Cc: stable at dpdk.org
@@ -24 +25 @@
-index 254026f386..92fbd04a6a 100644
+index a5800fc5adf..b85ac95a0e5 100644
@@ -27 +28 @@
-@@ -266,11 +266,20 @@ dev_uev_handler(__rte_unused void *param)
+@@ -265,11 +265,20 @@ dev_uev_handler(__rte_unused void *param)