linux-kernel - Re: [PATCH net v3] net/mlx5: fix calling mlx5_cmd

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Message-ID: <ZSbnUlJT1u3xUIqY@x130>
Date:   Wed, 11 Oct 2023 11:20:02 -0700
From:   Saeed Mahameed <saeed@...nel.org>
To:     Niklas Schnelle <schnelle@...ux.ibm.com>
Cc:     Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Matthew Rosato <mjrosato@...ux.ibm.com>,
        Joerg Roedel <joro@...tes.org>,
        Robin Murphy <robin.murphy@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Shay Drory <shayd@...dia.com>,
        Moshe Shemesh <moshe@...dia.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        linux-s390@...r.kernel.org, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jacob Keller <jacob.e.keller@...el.com>
Subject: Re: [PATCH net v3] net/mlx5: fix calling mlx5_cmd_init() before DMA
 mask is set

On 11 Oct 09:57, Niklas Schnelle wrote:
>Since commit 06cd555f73ca ("net/mlx5: split mlx5_cmd_init() to probe and
>reload routines") mlx5_cmd_init() is called in mlx5_mdev_init() which is
>called in probe_one() before mlx5_pci_init(). This is a problem because
>mlx5_pci_init() is where the DMA and coherent mask is set but
>mlx5_cmd_init() already does a dma_alloc_coherent(). Thus a DMA
>allocation is done during probe before the correct mask is set. This
>causes probe to fail initialization of the cmdif SW structs on s390x
>after that is converted to the common dma-iommu code. This is because on
>s390x DMA addresses below 4 GiB are reserved on current machines and
>unlike the old s390x specific DMA API implementation common code
>enforces DMA masks.
>
>Fix this by moving set_dma_caps() out of mlx5_pci_init() and into
>probe_one() before mlx5_mdev_init(). To match the overall naming scheme
>rename it to mlx5_dma_init().

How about we just call mlx5_pci_init() before mlx5_mdev_init(), instead of
breaking it apart ? 
>