netdev - Re: [PATCH] igb: add parameter to ignore nvm checksum validation

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Message-ID: <76B41175-0CEE-466C-91BF-89A1CA857061@cisco.com>
Date:   Thu, 16 May 2019 19:55:16 +0000
From:   "Nikunj Kela (nkela)" <nkela@...co.com>
To:     "jeffrey.t.kirsher@...el.com" <jeffrey.t.kirsher@...el.com>
CC:     "xe-linux-external(mailer list)" <xe-linux-external@...co.com>,
        "David S. Miller" <davem@...emloft.net>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] igb: add parameter to ignore nvm checksum validation



On 5/16/19, 12:35 PM, "Jeff Kirsher" <jeffrey.t.kirsher@...el.com> wrote:

    On Wed, 2019-05-08 at 23:14 +0000, Nikunj Kela wrote:
   >> Some of the broken NICs don't have EEPROM programmed correctly. It
   >> results
   >> in probe to fail. This change adds a module parameter that can be
   >> used to
   >> ignore nvm checksum validation.
   >> 
   >> Cc: xe-linux-external@...co.com
   >> Signed-off-by: Nikunj Kela <nkela@...co.com>
   >> ---
   >>  drivers/net/ethernet/intel/igb/igb_main.c | 28
   >> ++++++++++++++++++++++------
   >>  1 file changed, 22 insertions(+), 6 deletions(-)
    
    >NAK for two reasons.  First, module parameters are not desirable
    >because their individual to one driver and a global solution should be
    >found so that all networking device drivers can use the solution.  This
    >will keep the interface to change/setup/modify networking drivers
    >consistent for all drivers.

    
    >Second and more importantly, if your NIC is broken, fix it.  Do not try
    >and create a software workaround so that you can continue to use a
    >broken NIC.  There are methods/tools available to properly reprogram
    >the EEPROM on a NIC, which is the right solution for your issue.

I am proposing this as a debug parameter. Obviously, we need to fix EEPROM but this helps us continuing the development while manufacturing fixes NIC.