[dpdk-dev] [PATCH v1] vhost: add sanity check for resubmiting reqs in split ring
Maxime Coquelin
maxime.coquelin at redhat.com
Thu Oct 14 10:25:36 CEST 2021
On 10/14/21 10:17, Maxime Coquelin wrote:
> Hi Li,
>
> Adding Jin Yu who introduced this function.
Looks like Jin Yu has left Intel, Chenbo, could you find someone from
the Intel SPDK team to look at it?
> On 8/27/21 07:12, Li Feng wrote:
>> When getting reqs from the avail ring, the id may exceed inflight
>> queue size. Then the dpdk will crash forever.
>
> You need to add Fixes tag and Cc stable at dpdk.org so that it can be
> backported.
>
>> Signed-off-by: Li Feng <fengli at smartx.com>
>> ---
>> lib/vhost/vhost_user.c | 10 ++++++++--
>> 1 file changed, 8 insertions(+), 2 deletions(-)
>>
>> diff --git a/lib/vhost/vhost_user.c b/lib/vhost/vhost_user.c
>> index 29a4c9af60..f09d0f6a48 100644
>> --- a/lib/vhost/vhost_user.c
>> +++ b/lib/vhost/vhost_user.c
>> @@ -1823,8 +1823,14 @@ vhost_check_queue_inflights_split(struct
>> virtio_net *dev,
>> last_io = inflight_split->last_inflight_io;
>> if (inflight_split->used_idx != used->idx) {
>> - inflight_split->desc[last_io].inflight = 0;
>> - rte_atomic_thread_fence(__ATOMIC_SEQ_CST);
>> + if (unlikely(last_io >= inflight_split->desc_num)) {
>> + VHOST_LOG_CONFIG(ERR, "last_inflight_io '%"PRIu16"'
>> exceeds inflight "
>> + "queue size (%"PRIu16").\n", last_io,
>> + inflight_split->desc_num);
>
> If such error happens, shouldn't we return RTE_VHOST_MSG_RESULT_ERR
> instead of just logging an error?
>
>> + } else {
>> + inflight_split->desc[last_io].inflight = 0;
>> + rte_atomic_thread_fence(__ATOMIC_SEQ_CST);
>> + }
>> inflight_split->used_idx = used->idx;
>> }
>>
>
> Regards,
> Maxime
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