linux-kernel - Re: [PATCH net] net/mlx5: Fix setting of irq->map.index for static IRQ case

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Message-ID: <7469ae42-63a2-4078-b997-30d959429d70@sirena.org.uk>
Date:   Tue, 30 May 2023 22:25:26 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Niklas Schnelle <schnelle@...ux.ibm.com>
Cc:     Shay Drory <shayd@...dia.com>, Saeed Mahameed <saeedm@...dia.com>,
        Eli Cohen <elic@...dia.com>, Leon Romanovsky <leon@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-rdma@...r.kernel.org
Subject: Re: [PATCH net] net/mlx5: Fix setting of irq->map.index for static
 IRQ case

On Tue, May 30, 2023 at 04:13:04PM +0200, Niklas Schnelle wrote:
> When dynamic IRQ allocation is not supported all IRQs are allocated up
> front in mlx5_irq_table_create() instead of dynamically as part of
> mlx5_irq_alloc(). In the latter dynamic case irq->map.index is set
> via the mapping returned by pci_msix_alloc_irq_at(). In the static case
> and prior to commit 1da438c0ae02 ("net/mlx5: Fix indexing of mlx5_irq")
> irq->map.index was set in mlx4_irq_alloc() twice once initially to 0 and
> then to the requested index before storing in the xarray. After this
> commit it is only set to 0 which breaks all other IRQ mappins.

s/mappins/mappings/

We were seeing the issue that this fixes on a Cavium ThunderX2 system
and the analysis looks good so:

Tested-by: Mark Brown <broonie@...nel.org>
Reviewed-by: Mark Brown <broonie@...nel.org>

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