From: Jakub Kicinski <kuba@kernel•org>
To: Vladimir Oltean <vladimir.oltean@nxp•com>
Cc: "Mogilappagari, Sudheer" <sudheer.mogilappagari@intel•com>,
Michal Kubecek <mkubecek@suse•cz>,
"netdev@vger•kernel.org" <netdev@vger•kernel.org>,
Wei Fang <wei.fang@nxp•com>,
"Samudrala, Sridhar" <sridhar.samudrala@intel•com>
Subject: Re: Netlink handler for ethtool --show-rxfh breaks driver compatibility
Date: Wed, 17 Jul 2024 09:45:01 -0700 [thread overview]
Message-ID: <20240717094501.2e60075d@kernel.org> (raw)
In-Reply-To: <20240715154653.kcqcazsndp4nrqqh@skbuf>
On Mon, 15 Jul 2024 18:46:53 +0300 Vladimir Oltean wrote:
> > They can provide a different number? Which number is the user
> > supposed to trust? Out of the 4 APIs we have? Or the NIC has
> > a different ring count depending on the API?
>
> To stay on point on GRXRINGS vs GCHANNELS, "man ethtool" does say
> "A channel is an IRQ and the set of queues that can trigger that IRQ."
> Doesn't sound either (a) identical or (b) that you can recover the # of
> rings from the # of channels, unless you make an assumption about how
> they are distributed to IRQs...
A bit short on time to write a proper reply, but thinking some more
about it, I think you're right. The choice of channels is not great.
It works today, but if we start stacking multiple Rx queues on a single
IRQ one day - things will get complicated. So let's go back to GRXRINGS
for now.
prev parent reply other threads:[~2024-07-17 16:45 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-11 11:45 Netlink handler for ethtool --show-rxfh breaks driver compatibility Vladimir Oltean
2024-07-15 7:37 ` Mogilappagari, Sudheer
2024-07-15 11:58 ` Vladimir Oltean
2024-07-15 13:11 ` Jakub Kicinski
2024-07-15 13:22 ` Vladimir Oltean
2024-07-15 13:39 ` Jakub Kicinski
2024-07-15 15:05 ` Vladimir Oltean
2024-07-15 15:26 ` Jakub Kicinski
2024-07-15 15:45 ` Michal Kubecek
2024-07-15 15:46 ` Vladimir Oltean
2024-07-17 16:45 ` Jakub Kicinski [this message]
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