linux-kernel - Re: [PATCH v8.1 net-next 01/23] net/tcp: Prepare tcp_md5sig

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Message-ID: <ZL54mOdTzX5Z9Fji@corigine.com>
Date:   Mon, 24 Jul 2023 15:11:52 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Dmitry Safonov <dima@...sta.com>
Cc:     David Ahern <dsahern@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org,
        Andy Lutomirski <luto@...capital.net>,
        Ard Biesheuvel <ardb@...nel.org>,
        Bob Gilligan <gilligan@...sta.com>,
        Dan Carpenter <error27@...il.com>,
        David Laight <David.Laight@...lab.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Donald Cassidy <dcassidy@...hat.com>,
        Eric Biggers <ebiggers@...nel.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Francesco Ruggeri <fruggeri05@...il.com>,
        "Gaillardetz, Dominik" <dgaillar@...na.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Ivan Delalande <colona@...sta.com>,
        Leonard Crestez <cdleonard@...il.com>,
        Salam Noureddine <noureddine@...sta.com>,
        "Tetreault, Francois" <ftetreau@...na.com>, netdev@...r.kernel.org,
        Steen Hegelund <Steen.Hegelund@...rochip.com>
Subject: Re: [PATCH v8.1 net-next 01/23] net/tcp: Prepare tcp_md5sig_pool for
 TCP-AO

On Fri, Jul 21, 2023 at 05:18:52PM +0100, Dmitry Safonov wrote:

Hi Dmitry,

some minor nits from my side.

...

> +/**
> + * tcp_sigpool_start - disable bh and start using tcp_sigpool_ahash
> + * @id: tcp_sigpool that was previously allocated by tcp_sigpool_alloc_ahash()
> + * @c: returned tcp_sigpool for usage (uninitialized on failure)
> + */
> +int tcp_sigpool_start(unsigned int id, struct tcp_sigpool *c);
> +/**
> + * tcp_sigpool_end - enable bh and stop using tcp_sigpool

nit: as this is a kernel doc, please document @c here.

> + */
> +void tcp_sigpool_end(struct tcp_sigpool *c);
> +size_t tcp_sigpool_algo(unsigned int id, char *buf, size_t buf_len);
>  /* - functions */
>  int tcp_v4_md5_hash_skb(char *md5_hash, const struct tcp_md5sig_key *key,
>  			const struct sock *sk, const struct sk_buff *skb);

...

> @@ -1439,8 +1443,7 @@ int tcp_v4_md5_hash_skb(char *md5_hash, const struct tcp_md5sig_key *key,
>  			const struct sock *sk,
>  			const struct sk_buff *skb)
>  {
> -	struct tcp_md5sig_pool *hp;
> -	struct ahash_request *req;
> +	struct tcp_sigpool hp;
>  	const struct tcphdr *th = tcp_hdr(skb);
>  	__be32 saddr, daddr;

nit: please consider using reverse xmas tree - longest line to shortest -
     for these local variable declarations.

	const struct tcphdr *th = tcp_hdr(skb);
	struct tcp_sigpool hp;
	__be32 saddr, daddr;

Likewise, elsewhere, when it can be done without excess churn.

...