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From: David Miller <davem@davemloft.net>
To: Jason@zx2c4.com
Cc: linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org,
	netdev@vger.kernel.org, gregkh@linuxfoundation.org
Subject: Re: [PATCH net-next v9 19/19] net: WireGuard secure network tunnel
Date: Sun, 24 Mar 2019 20:02:54 -0400 (EDT)
Message-ID: <20190324.200254.1946143057733371048.davem@davemloft.net> (raw)
In-Reply-To: <20190322071122.6677-20-Jason@zx2c4.com>

From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Fri, 22 Mar 2019 01:11:22 -0600

> +static __always_inline void swap_endian(u8 *dst, const u8 *src, u8 bits)
> +{

Unless you have an absolutely requirement on inlining (if uninlined,
the compilation would break), you must not use the __always_inline
keyword and you must let the compiler decide what to do.

Said another way: "The code isn't optimal with my compiler on my computer
unless I force inline this" is not a valid reason to use __always_inline

And for this reason we never use __inline in foo.c files, always let the
compiler decide.

This applies to your entire submission.

> +		((u64 *)dst)[0] = be64_to_cpu(((const __be64 *)src)[0]);
> +		((u64 *)dst)[1] = be64_to_cpu(((const __be64 *)src)[1]);

Are 'dst' and 'src' both 64-bit aligned?  If not you'll get traps on some cpus.

> +	__skb_queue_head_init(&packets);
> +	if (!skb_is_gso(skb)) {
> +		skb->next = NULL;

Why?  Direct ->next and ->prev pointer accesses should never be used,
along with anything that assumes what the implentation of skb lists
looks like.

Always use the helpers instead.

> diff --git a/drivers/net/wireguard/hashtables.c b/drivers/net/wireguard/hashtables.c
> new file mode 100644
> index 000000000000..8aedc17b85f9
> --- /dev/null
> +++ b/drivers/net/wireguard/hashtables.c

No way.

Do not invent your own hashtables, we have several generic versions in
tree and in particular rhashtable.

If the generic kernel facilities have a weakness, fix that instead of
rolling an entire new hashtable implementation.

  reply index

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-22  7:11 [PATCH net-next v9 00/19] WireGuard: Secure Network Tunnel Jason A. Donenfeld
2019-03-22  7:11 ` [PATCH net-next v9 01/19] asm: simd context helper API Jason A. Donenfeld
2019-03-22 11:21   ` Thomas Gleixner
2019-03-22  7:11 ` [PATCH net-next v9 02/19] zinc: introduce minimal cryptography library Jason A. Donenfeld
2019-03-22  7:11 ` [PATCH net-next v9 03/19] zinc: ChaCha20 generic C implementation and selftest Jason A. Donenfeld
2019-03-22  7:11 ` [PATCH net-next v9 04/19] zinc: ChaCha20 x86_64 implementation Jason A. Donenfeld
2019-03-22  7:11 ` [PATCH net-next v9 05/19] zinc: ChaCha20 ARM and ARM64 implementations Jason A. Donenfeld
2019-03-22 23:17   ` Stefan Agner
2019-03-22  7:11 ` [PATCH net-next v9 06/19] zinc: ChaCha20 MIPS32r2 implementation Jason A. Donenfeld
2019-03-22  7:11 ` [PATCH net-next v9 07/19] zinc: Poly1305 generic C implementations and selftest Jason A. Donenfeld
2019-03-22  7:11 ` [PATCH net-next v9 08/19] zinc: Poly1305 x86_64 implementation Jason A. Donenfeld
2019-03-22  7:11 ` [PATCH net-next v9 09/19] zinc: Poly1305 ARM and ARM64 implementations Jason A. Donenfeld
2019-03-22  7:11 ` [PATCH net-next v9 10/19] zinc: Poly1305 MIPS64 and MIPS32r2 implementations Jason A. Donenfeld
2019-03-22  7:11 ` [PATCH net-next v9 11/19] zinc: ChaCha20Poly1305 construction and selftest Jason A. Donenfeld
2019-03-22  7:11 ` [PATCH net-next v9 12/19] zinc: BLAKE2s generic C implementation " Jason A. Donenfeld
2019-03-26 17:38   ` Eric Biggers
2019-03-22  7:11 ` [PATCH net-next v9 13/19] zinc: BLAKE2s x86_64 implementation Jason A. Donenfeld
2019-03-22  7:11 ` [PATCH net-next v9 14/19] zinc: Curve25519 generic C implementations and selftest Jason A. Donenfeld
2019-03-22  7:11 ` [PATCH net-next v9 15/19] zinc: Curve25519 x86_64 implementation Jason A. Donenfeld
2019-03-22  7:11 ` [PATCH net-next v9 16/19] zinc: import Bernstein and Schwabe's Curve25519 ARM implementation Jason A. Donenfeld
2019-03-22  7:11 ` [PATCH net-next v9 17/19] zinc: " Jason A. Donenfeld
2019-03-22  7:11 ` [PATCH net-next v9 18/19] security/keys: rewrite big_key crypto to use Zinc Jason A. Donenfeld
2019-03-22  7:11 ` [PATCH net-next v9 19/19] net: WireGuard secure network tunnel Jason A. Donenfeld
2019-03-25  0:02   ` David Miller [this message]
2019-03-25 10:13     ` Jason A. Donenfeld
2019-03-25 11:51 ` [PATCH net-next v9 00/19] WireGuard: Secure Network Tunnel Herbert Xu
2019-03-25 11:57   ` Jason A. Donenfeld
2019-03-25 12:03     ` Herbert Xu
2019-03-30  5:53     ` Eric Biggers
2019-03-31 18:18       ` Jason A. Donenfeld
2019-03-31 18:42         ` Eric Biggers
2019-03-25 16:04   ` David Miller

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