[PATCH] eal: prevent socket closure before MP sync

[PATCH] eal: prevent socket closure before MP sync

[Yang Ming]

The secordary process should not close socket file for MP
channel before performing MP request synchronization.
This prevents error logs when the secondary process exits
without any operation on the crypto device while the primary
process starts the device.

Case situation:
eal_bus_cleanup has been added in rte_eal_cleanup. But for the
secondary process, rte_eal_cleanup firstly performs
rte_mp_channel_cleanup, which closes socket file for the MP
channel, making mp_fd invalid. Subsequently, eal_bus_cleanup
triggers vdev_cleanup, which calls mp_request_sync to send a
message via the MP channel. Since mp_fd is invalid, error logs
occur.

Error logs occur as below when the secordary process exit:
EAL: failed to send to (/tmp/dpdk/l2hicu/mp_socket) due to Bad
file descriptor
EAL: Fail to send request /tmp/dpdk/l2hicu/mp_socket:
ipsec_mb_mp_msg
USER1: Create MR request to primary process failed.

Function call trace:
1. rte_eal_cleanup->rte_mp_channel_cleanup->close_socket_fd
2. rte_eal_cleanup->eal_bus_cleanup->vdev_cleanup->
rte_vdev_driver->ipsec_mb_remove->ipsec_mb_qp_release->
ipsec_mb_secondary_qp_op->rte_mp_request_sync->mp_request_sync->
send_msg->sendmsg(mp_fd, &msgh, 0);

Fixes: 1cab1a40ea9b ("bus: cleanup devices on shutdown")
Cc: kevin.laatz@intel.com
Cc: stable@dpdk.org

Signed-off-by: Yang Ming <ming.1.yang@nokia-sbell.com>
---
 lib/eal/linux/eal.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/eal/linux/eal.c b/lib/eal/linux/eal.c
index b1e63e37fc..73ea47b12d 100644
--- a/lib/eal/linux/eal.c
+++ b/lib/eal/linux/eal.c
@@ -1318,11 +1318,11 @@ rte_eal_cleanup(void)
 		rte_memseg_walk(mark_freeable, NULL);
 
 	rte_service_finalize();
+	eal_bus_cleanup();
 #ifdef VFIO_PRESENT
 	vfio_mp_sync_cleanup();
 #endif
 	rte_mp_channel_cleanup();
-	eal_bus_cleanup();
 	rte_trace_save();
 	eal_trace_fini();
 	eal_mp_dev_hotplug_cleanup();
-- 
2.34.1

Re: [PATCH] eal: prevent socket closure before MP sync

[Stephen Hemminger]

On Fri, 14 Mar 2025 18:36:38 +0800
Yang Ming <ming.1.yang@nokia-sbell.com> wrote:

> The secordary process should not close socket file for MP
> channel before performing MP request synchronization.
> This prevents error logs when the secondary process exits
> without any operation on the crypto device while the primary
> process starts the device.
> 
> Case situation:
> eal_bus_cleanup has been added in rte_eal_cleanup. But for the
> secondary process, rte_eal_cleanup firstly performs
> rte_mp_channel_cleanup, which closes socket file for the MP
> channel, making mp_fd invalid. Subsequently, eal_bus_cleanup
> triggers vdev_cleanup, which calls mp_request_sync to send a
> message via the MP channel. Since mp_fd is invalid, error logs
> occur.
> 
> Error logs occur as below when the secordary process exit:
> EAL: failed to send to (/tmp/dpdk/l2hicu/mp_socket) due to Bad
> file descriptor
> EAL: Fail to send request /tmp/dpdk/l2hicu/mp_socket:
> ipsec_mb_mp_msg
> USER1: Create MR request to primary process failed.
> 
> Function call trace:
> 1. rte_eal_cleanup->rte_mp_channel_cleanup->close_socket_fd
> 2. rte_eal_cleanup->eal_bus_cleanup->vdev_cleanup->
> rte_vdev_driver->ipsec_mb_remove->ipsec_mb_qp_release->
> ipsec_mb_secondary_qp_op->rte_mp_request_sync->mp_request_sync->
> send_msg->sendmsg(mp_fd, &msgh, 0);
> 
> Fixes: 1cab1a40ea9b ("bus: cleanup devices on shutdown")
> Cc: kevin.laatz@intel.com
> Cc: stable@dpdk.org
> 
> Signed-off-by: Yang Ming <ming.1.yang@nokia-sbell.com>

Looks good, could there be a test?

Acked-by: Stephen Hemminger <stephen@networkplumber.org>