Re: [PATCH] kni: fix kni rx fifo producer synchronization

[Jerin Jacob <jerin.jacob@caviumnetworks.com>]

-----Original Message-----
> Date: Thu,  9 Aug 2018 15:53:53 +0530
> From: Kiran Kumar <kkokkilagadda@caviumnetworks.com>
> To: ferruh.yigit@intel.com
> CC: dev@dpdk.org, Kiran Kumar <kkokkilagadda@caviumnetworks.com>
> Subject: [dpdk-dev]  [PATCH] kni: fix kni rx fifo producer synchronization
> X-Mailer: git-send-email 2.7.4
> 
> External Email
> 
> With existing code in kni_fifo_put, rx_q values are not being updated
> before updating fifo_write. While reading rx_q in kni_net_rx_normal,
> This is causing the sync issue on other core. So adding a write
> barrier to make sure the values being synced before updating fifo_write.
> 
> Fixes: 3fc5ca2f6352 ("kni: initial import")
> 

Please fix following check patch issue.
Wrong headline lowercase:
	kni: fix kni rx fifo producer synchronization

and Cc stable@dpdk.org


With above change:

Acked-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>


> Signed-off-by: Kiran Kumar <kkokkilagadda@caviumnetworks.com>
> ---
>  lib/librte_kni/rte_kni_fifo.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/lib/librte_kni/rte_kni_fifo.h b/lib/librte_kni/rte_kni_fifo.h
> index ac26a8c..4d6b33e 100644
> --- a/lib/librte_kni/rte_kni_fifo.h
> +++ b/lib/librte_kni/rte_kni_fifo.h
> @@ -39,6 +39,7 @@ kni_fifo_put(struct rte_kni_fifo *fifo, void **data, unsigned num)
>                 fifo->buffer[fifo_write] = data[i];
>                 fifo_write = new_write;
>         }
> +       rte_smp_wmb();
>         fifo->write = fifo_write;
>         return i;
>  }
> --
> 2.7.4
>