Re: [dpdk-dev] [PATCH] net/qede: only access sw rx ring index for debug

[Jerin Jacob <jerinjacobk@gmail.com>]

On Fri, Sep 27, 2019 at 4:59 PM David Marchand
<david.marchand@redhat.com> wrote:
>
> Caught by clang, this idx value is only used for a debug message when
> the mbufs allocation fails.
> No need to use idx as a temporary storage.
>
> Fixes: 8f2312474529 ("net/qede: fix performance bottleneck in Rx path")
> Cc: stable@dpdk.org

Rasesh, Shahed,

Please review this patch.

>
> Signed-off-by: David Marchand <david.marchand@redhat.com>
> ---
>  drivers/net/qede/qede_rxtx.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/qede/qede_rxtx.c b/drivers/net/qede/qede_rxtx.c
> index c38cbb9..1fbeba2 100644
> --- a/drivers/net/qede/qede_rxtx.c
> +++ b/drivers/net/qede/qede_rxtx.c
> @@ -46,8 +46,6 @@ static inline int qede_alloc_rx_bulk_mbufs(struct qede_rx_queue *rxq, int count)
>         int i, ret = 0;
>         uint16_t idx;
>
> -       idx = rxq->sw_rx_prod & NUM_RX_BDS(rxq);
> -
>         if (count > QEDE_MAX_BULK_ALLOC_COUNT)
>                 count = QEDE_MAX_BULK_ALLOC_COUNT;
>
> @@ -56,7 +54,9 @@ static inline int qede_alloc_rx_bulk_mbufs(struct qede_rx_queue *rxq, int count)
>                 PMD_RX_LOG(ERR, rxq,
>                            "Failed to allocate %d rx buffers "
>                             "sw_rx_prod %u sw_rx_cons %u mp entries %u free %u",
> -                           count, idx, rxq->sw_rx_cons & NUM_RX_BDS(rxq),
> +                           count,
> +                           rxq->sw_rx_prod & NUM_RX_BDS(rxq),
> +                           rxq->sw_rx_cons & NUM_RX_BDS(rxq),
>                             rte_mempool_avail_count(rxq->mb_pool),
>                             rte_mempool_in_use_count(rxq->mb_pool));
>                 return -ENOMEM;
> --
> 1.8.3.1
>