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

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Date: Tue, 30 May 2023 21:35:39 +0200
From: Simon Horman <simon.horman@...igine.com>
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.
> 
> Fix this by setting irq->map.index to the requested index together with
> irq->map.virq and improve the related comment to make it clearer which
> cases it deals with.
> 
> Fixes: 1da438c0ae02 ("net/mlx5: Fix indexing of mlx5_irq")
> Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>

Reviewed-by: Simon Horman <simon.horman@...igine.com>