linux-kernel - Re: [RFC net-next v4 6/9] netdev-genl: Support setting per-NAPI config values

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Message-ID: <ZwW5md5SlrxBeVCN@LQ3V64L9R2>
Date: Tue, 8 Oct 2024 16:00:41 -0700
From: Joe Damato <jdamato@...tly.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: netdev@...r.kernel.org, mkarsten@...terloo.ca, skhawaja@...gle.com,
	sdf@...ichev.me, bjorn@...osinc.com, amritha.nambiar@...el.com,
	sridhar.samudrala@...el.com, willemdebruijn.kernel@...il.com,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	Donald Hunter <donald.hunter@...il.com>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	Mina Almasry <almasrymina@...gle.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Daniel Jurgens <danielj@...dia.com>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC net-next v4 6/9] netdev-genl: Support setting per-NAPI
 config values

On Tue, Oct 08, 2024 at 03:19:34PM -0700, Jakub Kicinski wrote:
> On Tue, 8 Oct 2024 11:20:47 -0700 Joe Damato wrote:
> > Noticed this while re-reading the code; planning on changing this
> > from NLA_S32 to NLA_U32 for v5.
> 
> Make sure you edit the spec, not the output. Looks like there may be 
> a problem here (napi-id vs id in the attributes).

I'm not sure I follow this part, sorry if I'm just missing something
here.

I was referring to NETDEV_A_NAPI_DEFER_HARD_IRQS which in RFCv4 is
listed as NLA_S32 (in this patch):

static const struct nla_policy netdev_napi_set_nl_policy[NETDEV_A_NAPI_GRO_FLUSH_TIMEOUT + 1] = {
     [NETDEV_A_NAPI_ID] = { .type = NLA_U32, },
     [NETDEV_A_NAPI_DEFER_HARD_IRQS] = { .type = NLA_S32 },

However, in the yaml spec (patch 2/9):

+      -
+        name: defer-hard-irqs
+        doc: The number of consecutive empty polls before IRQ deferral ends
+             and hardware IRQs are re-enabled.
+        type: u32
+        checks:
+          max: s32-max

So the type is u32 but with a "checks" to match what happens now in
sysfs.

That's why I mentioned changing NLA_S32 to NLA_U32.

Am I missing something? Not sure what you meant by "napi-id vs id" ?

> Make sure you run: ./tools/net/ynl/ynl-regen.sh -f
> and the tree is clean afterwards

OK, will do.