netdev - Re: [PATCH net-next] tg3: improve PCI VPD access

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Date:   Mon, 25 Jan 2021 14:09:16 -0800
From:   Michael Chan <michael.chan@...adcom.com>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>,
        Siva Reddy Kallam <siva.kallam@...adcom.com>,
        Prashant Sreedharan <prashant@...adcom.com>,
        Michael Chan <mchan@...adcom.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] tg3: improve PCI VPD access

On Fri, Jan 22, 2021 at 4:08 AM Heiner Kallweit <hkallweit1@...il.com> wrote:
>
> When working on the PCI VPD code I also tested with a Broadcom BCM95719
> card. tg3 uses internal NVRAM access with this card, so I forced it to
> PCI VPD mode for testing. PCI VPD access fails
> (i + PCI_VPD_LRDT_TAG_SIZE + j > len) because only TG3_NVM_VPD_LEN (256)
> bytes are read, but PCI VPD has 400 bytes on this card.
>
> So add a constant TG3_NVM_PCI_VPD_MAX_LEN that defines the maximum
> PCI VPD size. The actual VPD size is returned by pci_read_vpd().
> In addition it's not worth looping over pci_read_vpd(). If we miss the
> 125ms timeout per VPD dword read then definitely something is wrong,
> and if the tg3 module loading is killed then there's also not much
> benefit in retrying the VPD read.
>
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>

Reviewed-by: Michael Chan <michael.chan@...adcom.com>

Thanks.

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