linux-kernel - RE: [Intel-wired-lan] [PATCH] i40e: Remove useless DMA-32 fallback configuration

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Date:   Thu, 13 Jan 2022 17:50:59 +0000
From:   "G, GurucharanX" <gurucharanx.g@...el.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Jakub Kicinski" <kuba@...nel.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        Christoph Hellwig <hch@....de>
Subject: RE: [Intel-wired-lan] [PATCH] i40e: Remove useless DMA-32 fallback
 configuration



> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of
> Christophe JAILLET
> Sent: Sunday, January 9, 2022 10:45 PM
> To: Brandeburg, Jesse <jesse.brandeburg@...el.com>; Nguyen, Anthony L
> <anthony.l.nguyen@...el.com>; David S. Miller <davem@...emloft.net>;
> Jakub Kicinski <kuba@...nel.org>
> Cc: netdev@...r.kernel.org; kernel-janitors@...r.kernel.org; linux-
> kernel@...r.kernel.org; Christophe JAILLET
> <christophe.jaillet@...adoo.fr>; intel-wired-lan@...ts.osuosl.org; Christoph
> Hellwig <hch@....de>
> Subject: [Intel-wired-lan] [PATCH] i40e: Remove useless DMA-32 fallback
> configuration
> 
> As stated in [1], dma_set_mask() with a 64-bit mask never fails if
> dev->dma_mask is non-NULL.
> So, if it fails, the 32 bits case will also fail for the same reason.
> 
> So, if dma_set_mask_and_coherent() succeeds, 'pci_using_dac' is known to
> be 1.
> 
> Simplify code and remove some dead code accordingly.
> 
> [1]: https://lkml.org/lkml/2021/6/7/398
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> Reviewed-by: Christoph Hellwig <hch@....de>
> Reviewed-by: Alexander Lobakin <alexandr.lobakin@...el.com>
> ---
>  drivers/net/ethernet/intel/e1000e/netdev.c | 22 +++++++---------------
>  1 file changed, 7 insertions(+), 15 deletions(-)
> 

Tested-by: Gurucharan G <gurucharanx.g@...el.com> (A Contingent worker at Intel)