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Message-ID: <CAHmME9ru=kJO8QiW+uNNgt5NgFVZzRsQ4tNSgo+f+KfHs3fAKQ@mail.gmail.com>
Date: Wed, 26 Sep 2018 17:49:55 +0200
From: "Jason A. Donenfeld" <Jason@...c4.com>
To: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc: Herbert Xu <herbert@...dor.apana.org.au>,
Thomas Gleixner <tglx@...utronix.de>,
LKML <linux-kernel@...r.kernel.org>,
Netdev <netdev@...r.kernel.org>,
Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
David Miller <davem@...emloft.net>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Samuel Neves <sneves@....uc.pt>,
Andrew Lutomirski <luto@...nel.org>,
Jean-Philippe Aumasson <jeanphilippe.aumasson@...il.com>,
Russell King - ARM Linux <linux@...linux.org.uk>,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH net-next v6 07/23] zinc: ChaCha20 ARM and ARM64 implementations
On Wed, Sep 26, 2018 at 5:45 PM Jason A. Donenfeld <Jason@...c4.com> wrote:
> So what you have in mind is something like calling simd_relax() every
> 4096 bytes or so?
That was actually pretty easy, putting together both of your suggestions:
static inline bool chacha20_arch(struct chacha20_ctx *state, u8 *dst,
u8 *src, size_t len,
simd_context_t *simd_context)
{
while (len > PAGE_SIZE) {
chacha20_arch(state, dst, src, PAGE_SIZE, simd_context);
len -= PAGE_SIZE;
src += PAGE_SIZE;
dst += PAGE_SIZE;
simd_relax(simd_context);
}
if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && chacha20_use_neon &&
len >= CHACHA20_BLOCK_SIZE * 3 && simd_use(simd_context))
chacha20_neon(dst, src, len, state->key, state->counter);
else
chacha20_arm(dst, src, len, state->key, state->counter);
state->counter[0] += (len + 63) / 64;
return true;
}
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