netdev - RE: [PATCH net] bnx2x: Check if transceiver implements DDM before access

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Message-ID: <MN2PR18MB25285A81C813B5C8C004079AD3EB0@MN2PR18MB2528.namprd18.prod.outlook.com>
Date:   Mon, 17 Jun 2019 11:47:17 +0000
From:   Sudarsana Reddy Kalluru <skalluru@...vell.com>
To:     David Miller <davem@...emloft.net>,
        "maurosr@...ux.vnet.ibm.com" <maurosr@...ux.vnet.ibm.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Ariel Elior <aelior@...vell.com>,
        GR-everest-linux-l2 <GR-everest-linux-l2@...vell.com>
Subject: RE: [PATCH net] bnx2x: Check if transceiver implements DDM before
 access

> -----Original Message-----
> From: David Miller <davem@...emloft.net>
> Sent: Monday, June 17, 2019 2:09 AM
> To: maurosr@...ux.vnet.ibm.com
> Cc: netdev@...r.kernel.org; Ariel Elior <aelior@...vell.com>; Sudarsana
> Reddy Kalluru <skalluru@...vell.com>; GR-everest-linux-l2 <GR-everest-
> linux-l2@...vell.com>
> Subject: Re: [PATCH net] bnx2x: Check if transceiver implements DDM before
> access
> 
> From: "Mauro S. M. Rodrigues" <maurosr@...ux.vnet.ibm.com>
> Date: Thu, 13 Jun 2019 16:25:40 -0300
> 
> > Some transceivers may comply with SFF-8472 even though they do not
> > implement the Digital Diagnostic Monitoring (DDM) interface described
> > in the spec. The existence of such area is specified by the 6th bit of
> > byte 92, set to 1 if implemented.
> >
> > Currently, without checking this bit, bnx2x fails trying to read sfp
> > module's EEPROM with the follow message:
> >
> > ethtool -m enP5p1s0f1
> > Cannot get Module EEPROM data: Input/output error
> >
> > Because it fails to read the additional 256 bytes in which it is
> > assumed to exist the DDM data.
> >
> > This issue was noticed using a Mellanox Passive DAC PN 01FT738. The
> > EEPROM data was confirmed by Mellanox as correct and similar to other
> > Passive DACs from other manufacturers.
> >
> > Signed-off-by: Mauro S. M. Rodrigues <maurosr@...ux.vnet.ibm.com>
> 
> Marvell folks, please review.

Acked-by: Sudarsana Reddy Kalluru <skalluru@...vell.com>