[PATCH] memif: memif driver does not crashes when there's different N of TX and RX queues

[Joyce Kong]

Hi Huzaifa,

This patch looks good to me.
And would you please help review my memif patches?
https://patches.dpdk.org/project/dpdk/cover/20220701102815.1444223-1-joyce.kong@arm.com/

Thanks,
Joyce

> -----Original Message-----
> From: huzaifa.rahman <huzaifa.rahman at emumba.com>
> Sent: Tuesday, July 26, 2022 6:16 PM
> To: jgrajcia at cisco.com
> Cc: dev at dpdk.org; huzaifa.rahman <huzaifa.rahman at emumba.com>
> Subject: [PATCH] memif: memif driver does not crashes when there's
> different N of TX and RX queues
net/memif: fix memif crash with different Tx Rx queues

>
> Bugzilla ID: 734
>
> there's a bug in memif_stats_get() function due to confusion between C2S
> (client->server) and S2C (server->client) rings, causing a crash if there's a
> different number of RX and TX queues.
>
> this is fixed by selectiing the correct rings for RX and TX i.e for RX, S2C rings
> are selected and for TX, C2S rings are selected.
>
Fixes: 09c7e63a71f9 ("net/memif: introduce memory interface PMD")
Cc: stable at dpdk.org

> Signed-off-by: huzaifa.rahman <huzaifa.rahman at emumba.com>
Reviewed-by: Joyce Kong <joyce.kong at arm.com>

> ---
>  drivers/net/memif/rte_eth_memif.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/memif/rte_eth_memif.c
> b/drivers/net/memif/rte_eth_memif.c
> index dd951b8296..e56df84e10 100644
> --- a/drivers/net/memif/rte_eth_memif.c
> +++ b/drivers/net/memif/rte_eth_memif.c
> @@ -1444,8 +1444,8 @@ memif_stats_get(struct rte_eth_dev *dev, struct
> rte_eth_stats *stats)
>       stats->opackets = 0;
>       stats->obytes = 0;
>
> -     tmp = (pmd->role == MEMIF_ROLE_CLIENT) ? pmd-
> >run.num_c2s_rings :
> -         pmd->run.num_s2c_rings;
> +     tmp = (pmd->role == MEMIF_ROLE_CLIENT) ? pmd-
> >run.num_s2c_rings :
> +         pmd->run.num_c2s_rings;
>       nq = (tmp < RTE_ETHDEV_QUEUE_STAT_CNTRS) ? tmp :
>           RTE_ETHDEV_QUEUE_STAT_CNTRS;
>
> @@ -1458,8 +1458,8 @@ memif_stats_get(struct rte_eth_dev *dev, struct
> rte_eth_stats *stats)
>               stats->ibytes += mq->n_bytes;
>       }
>
> -     tmp = (pmd->role == MEMIF_ROLE_CLIENT) ? pmd-
> >run.num_s2c_rings :
> -         pmd->run.num_c2s_rings;
> +     tmp = (pmd->role == MEMIF_ROLE_CLIENT) ? pmd-
> >run.num_c2s_rings :
> +         pmd->run.num_s2c_rings;
>       nq = (tmp < RTE_ETHDEV_QUEUE_STAT_CNTRS) ? tmp :
>           RTE_ETHDEV_QUEUE_STAT_CNTRS;
>
> --
> 2.25.1

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