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Date: Tue, 9 Apr 2019 22:48:15 +0800
From: Ye Xiaolong <xiaolong.ye@intel.com>
To: David Marchand <david.marchand@redhat.com>
Cc: dev <dev@dpdk.org>, Ferruh Yigit <ferruh.yigit@intel.com>,
 Qi Zhang <qi.z.zhang@intel.com>,
 Karlsson Magnus <magnus.karlsson@intel.com>,
 Topel Bjorn <bjorn.topel@intel.com>
Message-ID: <20190409144815.GA13056@intel.com>
References: <20190409082128.33896-1-xiaolong.ye@intel.com>
 <CAJFAV8yNEPDi2SmAbccbOgQBee_WPC3D7qZwoo=81VK-j9zpFQ@mail.gmail.com>
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Subject: Re: [dpdk-dev] [PATCH] net/af_xdp: free mbuf when allocate Tx queue
 fails
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Message-ID: <20190409144815.NUJALBm89Rdvxj5uLStn5YUfLSiRM3albLN2xPccoXc@z>

Hi, David

On 04/09, David Marchand wrote:
>On Tue, Apr 9, 2019 at 10:27 AM Xiaolong Ye <xiaolong.ye@intel.com> wrote:
>
>> When we fail to allocate enough slots in tx queue for transmitting
>> packets, we need to free the corresponding mbufs.
>>
>
>You'd better let the application retry on its own...

Make sense.

>
>
>> Fixes: f1debd77efaf ("net/af_xdp: introduce AF_XDP PMD")
>>
>> Signed-off-by: Xiaolong Ye <xiaolong.ye@intel.com>
>> ---
>>  drivers/net/af_xdp/rte_eth_af_xdp.c | 8 ++++++--
>>  1 file changed, 6 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/af_xdp/rte_eth_af_xdp.c
>> b/drivers/net/af_xdp/rte_eth_af_xdp.c
>> index 007a1c6b4..bc7973b56 100644
>> --- a/drivers/net/af_xdp/rte_eth_af_xdp.c
>> +++ b/drivers/net/af_xdp/rte_eth_af_xdp.c
>> @@ -276,7 +276,8 @@ eth_af_xdp_tx(void *queue, struct rte_mbuf **bufs,
>> uint16_t nb_pkts)
>>
>>         if (xsk_ring_prod__reserve(&txq->tx, nb_pkts, &idx_tx) != nb_pkts)
>> {
>>                 kick_tx(txq);
>> -               return 0;
>> +               nb_pkts = 0;
>> +               goto out;
>>
>
>...and free back the buffers you got from the umem ring here.

Agree, will send a new version.

Thanks,
Xiaolong
>
>        }
>>
>>         for (i = 0; i < nb_pkts; i++) {
>>
>
>
>-- 
>David Marchand