[dpdk-stable] [dpdk-dev] [PATCH] net/mlx5: fix Rx descriptor status returned value
Didier Pallard
didier.pallard at 6wind.com
Thu Oct 29 12:29:09 CET 2020
Hi slava,
Is this fixed in main branch now?
If yes could you please point me out the proper commit?
Thanks
Didier
On 3/17/20 10:25 AM, Slava Ovsiienko wrote:
>
> *From:* Didier Pallard <didier.pallard at 6wind.com>
> *Sent:* Tuesday, March 17, 2020 11:19
> *To:* Slava Ovsiienko <viacheslavo at mellanox.com>
> *Cc:* dev at dpdk.org; stable at dpdk.org; Matan Azrad <matan at mellanox.com>
> *Subject:* Re: [dpdk-dev] [PATCH] net/mlx5: fix Rx descriptor status
> returned value
>
> >>>well, please do if you don't mind,
>
> OK, I will.
>
> >>>You will validate it quicker, and I'm currently working on a
> different topic.
>
> >>>Btw, do you think it's possible to have an implementation of
> [r,t]x_status_descriptor functions for vectorized implementation?
>
> >>>thanks
>
> Yes, we are planning this update.
>
> With best regards, Slava
>
> didier
>
> On Tue, Mar 17, 2020 at 9:33 AM Slava Ovsiienko
> <viacheslavo at mellanox.com <mailto:viacheslavo at mellanox.com>> wrote:
>
> >> From: Didier Pallard <didier.pallard at 6wind.com
> <mailto:didier.pallard at 6wind.com>>
> >> Sent: Monday, March 16, 2020 19:24
> >> To: Slava Ovsiienko <viacheslavo at mellanox.com
> <mailto:viacheslavo at mellanox.com>>
> >> Cc: dev at dpdk.org <mailto:dev at dpdk.org>; stable at dpdk.org
> <mailto:stable at dpdk.org>; Matan Azrad <matan at mellanox.com
> <mailto:matan at mellanox.com>>
> >> Subject: Re: [dpdk-dev] [PATCH] net/mlx5: fix Rx descriptor
> status returned value
> >> Well, you're right, another way to fix the problem could be to
> set up the queue size assuming the provided number
> >> is a number of packets in queue rather than a number of mbufs
> in queue.
>
> Yes, it is intended in queue setup routine. But, for mlx5 we have
> a bug for regular mlx5_rx_burst if scattering is enabled,
> the Rx queue is created with size wqe_n elements, should be wqe_n
> << sges_n instead, to be able to receive the requested
> number of packets (wqe_n). I think we must fix. Would you like to
> update your patch, or should I provide mine?
>
> >> But not sure it's better, it's also important for the
> application/user to know the number of mbufs that could fit in a
> rx/tx queue,
> >> whatever the number of packets that it covers, since it is very
> important to size the memory pools correctly to avoid any
> >> mbuf shortage during system life.
> >> Thanks
> >> Didier
> To estimate - the number of "DPDK descriptors" should be
> multiplied by the maximal length of scattered packet chain.
>
> With best regards, Slava
>
> > -----Original Message-----
> > From: dev <mailto:dev-bounces at dpdk.org
> <mailto:dev-bounces at dpdk.org>> On Behalf Of Didier Pallard
> > Sent: Friday, March 13, 2020 11:57
> > To: mailto:dev at dpdk.org <mailto:dev at dpdk.org>
> > Cc: mailto:stable at dpdk.org <mailto:stable at dpdk.org>
> > Subject: [dpdk-dev] [PATCH] net/mlx5: fix Rx descriptor status
> returned value
> >
> > Two bugs in rx_queue_count function:
> > - One entry may contain several segments, so 'used' must be
> multiplied
> > by number of segments per entry to properly reflect the queue
> usage.
> > - rx_queue_count returns the number of entries used in queue, so
> it ranges
> > from 0 to max number of entries in queue, not this number minus
> > one.
> >
> > Fixes: 8788fec1f269 ("net/mlx5: implement descriptor status API")
> > Cc: mailto:stable at dpdk.org <mailto:stable at dpdk.org>
> > Signed-off-by: Didier Pallard <mailto:didier.pallard at 6wind.com
> <mailto:didier.pallard at 6wind.com>>
> > ---
> > drivers/net/mlx5/mlx5_rxtx.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/mlx5/mlx5_rxtx.c
> b/drivers/net/mlx5/mlx5_rxtx.c index
> > 5ac63da8039d..17f80c25443e 100644
> > --- a/drivers/net/mlx5/mlx5_rxtx.c
> > +++ b/drivers/net/mlx5/mlx5_rxtx.c
> > @@ -500,7 +500,7 @@ rx_queue_count(struct mlx5_rxq_data *rxq)
> > used += n;
> > cqe = &(*rxq->cqes)[cq_ci & cqe_cnt];
> > }
> > - used = RTE_MIN(used, (1U << rxq->elts_n) - 1);
> > + used = RTE_MIN(used * (1 << rxq->sges_n), 1U << rxq->elts_n);
> > return used;
> > }
> >
> > --
> > 2.24.1
>
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