netdev - Re: [PATCH net-next] net: do not inline rtnl

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Message-ID: <20240709182306.4d57315a@kernel.org>
Date: Tue, 9 Jul 2024 18:23:06 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Eric Dumazet <edumazet@...gle.com>
Cc: "David S . Miller" <davem@...emloft.net>, Paolo Abeni
 <pabeni@...hat.com>, netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH net-next] net: do not inline rtnl_calcit()

On Tue,  9 Jul 2024 23:08:15 +0000 Eric Dumazet wrote:
> -static u32 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
> +static noinline_for_stack u32 rtnl_calcit(struct sk_buff *skb,
> +					  struct nlmsghdr *nlh)

We only look at a single attribute - IFLA_EXT_MASK. We can change the
tb size to IFLA_EXT_MASK + 1 and pass IFLA_EXT_MASK as max_attr to
parse. Parsing the other attrs is pointless, anyway.

Or possibly just walk the attrs with nla_for_each_attr_type() without
parsing at all.