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Date: Mon, 14 Sep 2020 09:20:53 -0700 From: Jakub Kicinski <kuba@...nel.org> To: Ido Schimmel <idosch@...sch.org> Cc: Alexander Duyck <alexander.duyck@...il.com>, David Miller <davem@...emloft.net>, Netdev <netdev@...r.kernel.org>, Michal Kubecek <mkubecek@...e.cz>, Michael Chan <michael.chan@...adcom.com>, tariqt@...dia.com, saeedm@...dia.com, Andrew Lunn <andrew@...n.ch> Subject: Re: [PATCH net-next 7/8] ixgbe: add pause frame stats On Sun, 13 Sep 2020 12:14:14 +0300 Ido Schimmel wrote: > On Fri, Sep 11, 2020 at 03:13:43PM -0700, Jakub Kicinski wrote: > > On Fri, 11 Sep 2020 14:12:50 -0700 Alexander Duyck wrote: > > > On Fri, Sep 11, 2020 at 12:53 PM Jakub Kicinski <kuba@...nel.org> wrote: > > > > @@ -3546,6 +3556,7 @@ static const struct ethtool_ops ixgbe_ethtool_ops = { > > > > .set_eeprom = ixgbe_set_eeprom, > > > > .get_ringparam = ixgbe_get_ringparam, > > > > .set_ringparam = ixgbe_set_ringparam, > > > > + .get_pause_stats = ixgbe_get_pause_stats, > > > > .get_pauseparam = ixgbe_get_pauseparam, > > > > .set_pauseparam = ixgbe_set_pauseparam, > > > > .get_msglevel = ixgbe_get_msglevel, > > > > > > So the count for this is simpler in igb than it is for ixgbe. I'm > > > assuming you want just standard link flow control frames. If so then > > > this patch is correct. Otherwise if you are wanting to capture > > > priority flow control data then those are a seperate array of stats > > > prefixed with a "p" instead of an "l". Otherwise this looks fine to > > > me. > > > > That's my interpretation, although I haven't found any place the > > standard would address this directly. Non-PFC pause has a different > > opcode, so I'm reasonably certain this makes sense. > > > > BTW I'm not entirely clear on what "global PFC pause" is either. > > > > Maybe someone can clarify? Mellanox folks? > > I checked IEEE 802.1Qaz and could not find anything relevant. My only > guess is that it might be a PFC frame with all the priorities set. > > Where did you see it? I think I saw it in MLX5 and I thought it's something implementation-specific. But then I noticed 802.1-2018 has a ieee8021PfcGlobalReqdGroup group.
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