netdev - RE: [Intel-wired-lan] [PATCH v2] igb: dont drop packets if rx flow control is enabled

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Date:   Wed, 20 Nov 2019 02:49:50 +0000
From:   "Brown, Aaron F" <aaron.f.brown@...el.com>
To:     Robert Beckett <bob.beckett@...labora.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: RE: [Intel-wired-lan] [PATCH v2] igb: dont drop packets if rx flow
 control is enabled



> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of
> Robert Beckett
> Sent: Tuesday, October 22, 2019 8:32 AM
> To: intel-wired-lan@...ts.osuosl.org
> Cc: Robert Beckett <bob.beckett@...labora.com>; netdev@...r.kernel.org;
> David S. Miller <davem@...emloft.net>
> Subject: [Intel-wired-lan] [PATCH v2] igb: dont drop packets if rx flow control
> is enabled
> 
> If rx flow control has been enabled (via autoneg or forced), packets
> should not be dropped due to rx descriptor ring exhaustion. Instead
> pause frames should be used to apply back pressure. This only applies
> if VFs are not in use.
> 
> Move SRRCTL setup to its own function for easy reuse and only set drop
> enable bit if rx flow control is not enabled.
> 
> Since v1: always enable dropping of packets if VFs in use.
> 
> Signed-off-by: Robert Beckett <bob.beckett@...labora.com>
> ---
>  drivers/net/ethernet/intel/igb/igb.h         |  1 +
>  drivers/net/ethernet/intel/igb/igb_ethtool.c |  8 ++++
>  drivers/net/ethernet/intel/igb/igb_main.c    | 47 ++++++++++++++------
>  3 files changed, 42 insertions(+), 14 deletions(-)
> 
Tested-by: Aaron Brown <aaron.f.brown@...el.com>