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

[Yang Ming]

On 2025/3/17 21:56, Stephen Hemminger wrote:
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> On Fri, 14 Mar 2025 18:36:38 +0800
> Yang Ming <ming.1.yang at 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 at intel.com
>> Cc: stable at dpdk.org
>>
>> Signed-off-by: Yang Ming <ming.1.yang at nokia-sbell.com>
> Looks good, could there be a test?
>
> Acked-by: Stephen Hemminger <stephen at networkplumber.org>
>
Hi Thanks Stephen,

We have some findings for this change in our product test line. I will 
do more investigation for this patch.

Brs,

Yang Ming