[dpdk-dev] [PATCH] net/vhost: Initialise vid to -1
Maxime Coquelin
maxime.coquelin at redhat.com
Fri May 4 15:09:05 CEST 2018
On 05/03/2018 03:18 PM, Loftus, Ciara wrote:
>>
>>>
>>> On 04/27/2018 04:19 PM, Ciara Loftus wrote:
>>>> rte_eth_vhost_get_vid_from_port_id returns a value of 0 if called before
>>>> the first call to the new_device callback. A vid value >=0 suggests the
>>>> device is active which is not the case in this instance. Initialise vid
>>>> to a negative value to prevent this.
>>>>
>>>> Signed-off-by: Ciara Loftus <ciara.loftus at intel.com>
>>>> ---
>>>> drivers/net/vhost/rte_eth_vhost.c | 1 +
>>>> 1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/drivers/net/vhost/rte_eth_vhost.c
>>> b/drivers/net/vhost/rte_eth_vhost.c
>>>> index 99a7727..f47950c 100644
>>>> --- a/drivers/net/vhost/rte_eth_vhost.c
>>>> +++ b/drivers/net/vhost/rte_eth_vhost.c
>>>> @@ -1051,6 +1051,7 @@ eth_rx_queue_setup(struct rte_eth_dev *dev,
>>> uint16_t rx_queue_id,
>>>> return -ENOMEM;
>>>> }
>>>>
>>>> + vq->vid = -1;
>>>> vq->mb_pool = mb_pool;
>>>> vq->virtqueue_id = rx_queue_id * VIRTIO_QNUM + VIRTIO_TXQ;
>>>> dev->data->rx_queues[rx_queue_id] = vq;
>>>>
>>>
>>> Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>
>>>
>>> Thanks,
>>> Maxime
>>
>> On second thoughts, self-NACK.
>>
>> We need to provision for the case where we want to call
>> eth_rx_queue_setup AFTER new_device. For instance when we want to
>> change the mb_pool. In this case we need to maintain the same vid and not
>> reset it to -1.
>>
>> Without this patch the original problem still exists and need to find an
>> alternative workaround.
>
> Junjie's patches fix the issue I was observing. Thanks Junjie!
> https://dpdk.org/browse/dpdk/commit/?id=30a701a53737a0b6f7953412cc3b3d36c1d49122
> https://dpdk.org/browse/dpdk/commit/?id=e6722dee533cda3756fbc5c9ea4ddfbf30276f1b
>
> Along with the v2 of this patch could they be considered for the 17.11 stable branch?
Yes, I think it is a good idea.
It wasn't planned for -stable initially as it fixed a new use-case in
v18.05.
Junjie, can you please generate a backport against v17.11 and post it to
stable at dpdk.org, adding "PATCH v17.11 LTS" as subject prefix, and using
-x option of when cherry-picking so that it references the patches in
master?
Thanks in advance,
Maxime
> Thanks,
> Ciara
>
>>
>> Thanks,
>> Ciara
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