linux-kernel - Re: [PATCH mlx5-vhost v2 01/10] net/mlx5: Support throttled commands from async API

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Message-ID: <CAJaqyWcEt7=3j2uoToZH=no-gPvRsXwW7RLtFcbD7_-nQ0Dqyw@mail.gmail.com>
Date: Wed, 11 Sep 2024 10:00:44 +0200
From: Eugenio Perez Martin <eperezma@...hat.com>
To: Dragos Tatulea <dtatulea@...dia.com>
Cc: "Michael S . Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, 
	virtualization@...ts.linux-foundation.org, Si-Wei Liu <si-wei.liu@...cle.com>, 
	Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>, kvm@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Gal Pressman <gal@...dia.com>, 
	Parav Pandit <parav@...dia.com>, Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, 
	Leon Romanovsky <leonro@...dia.com>, Tariq Toukan <tariqt@...dia.com>
Subject: Re: [PATCH mlx5-vhost v2 01/10] net/mlx5: Support throttled commands
 from async API

On Mon, Sep 9, 2024 at 11:33 AM Dragos Tatulea <dtatulea@...dia.com> wrote:
>
>
>
> On 16.08.24 11:01, Dragos Tatulea wrote:
> > Currently, commands that qualify as throttled can't be used via the
> > async API. That's due to the fact that the throttle semaphore can sleep
> > but the async API can't.
> >
> > This patch allows throttling in the async API by using the tentative
> > variant of the semaphore and upon failure (semaphore at 0) returns EBUSY
> > to signal to the caller that they need to wait for the completion of
> > previously issued commands.
> >
> > Furthermore, make sure that the semaphore is released in the callback.
> >
> > Signed-off-by: Dragos Tatulea <dtatulea@...dia.com>
> > Cc: Leon Romanovsky <leonro@...dia.com>
> > Reviewed-by: Tariq Toukan <tariqt@...dia.com>
> Same reminder as in v1: Tariq is the maintainer for mlx5 so his review
> also counts as Acked-by.
>

Not sure if it was the case when you send the mail, but this series is
already in the maintainer's branch:
* https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git/
* https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git/commit/?h=vhost&id=691fd851e1bc8ec043798e1ab337305e6291cd6b

Thanks!