From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by passt.top (Postfix) with ESMTP id CA39A5A027A for ; Sat, 17 Feb 2024 16:07:31 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1708182450; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=E+1+gT9c8cGE6jquIJK0KTAR5XU3eohkGAV/mP1XpLE=; b=EFl5MJAsGAE9CCMWby6g+2vMlAfBSfLY3mj9HgJBdemI85QsPr63TdgyUWXHNxEvvs0N6z yxwgXz2OrdAFKFqyOIhLsWpSxR4Ih2sfT481BM24Q+XkIvrN4OJdGr0qu7vlzy5XHxu1r3 qzAFSWt9beS3R2MnX5zlkByW7yu2DZg= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-237-qRTFOcVsNg2uSE9n-tpAFQ-1; Sat, 17 Feb 2024 10:07:27 -0500 X-MC-Unique: qRTFOcVsNg2uSE9n-tpAFQ-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 472941064D7E; Sat, 17 Feb 2024 15:07:27 +0000 (UTC) Received: from virtlab218.virt.lab.eng.bos.redhat.com (virtlab218.virt.lab.eng.bos.redhat.com [10.19.152.190]) by smtp.corp.redhat.com (Postfix) with ESMTP id 00F1D492BE2; Sat, 17 Feb 2024 15:07:26 +0000 (UTC) From: Laurent Vivier To: passt-dev@passt.top Subject: [PATCH v3 3/9] checksum: align buffers Date: Sat, 17 Feb 2024 16:07:19 +0100 Message-ID: <20240217150725.661467-4-lvivier@redhat.com> In-Reply-To: <20240217150725.661467-1-lvivier@redhat.com> References: <20240217150725.661467-1-lvivier@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.10 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII"; x-default=true Message-ID-Hash: VS6DEUSVFG76HR6A4TS42LOLDTBYLNBA X-Message-ID-Hash: VS6DEUSVFG76HR6A4TS42LOLDTBYLNBA X-MailFrom: lvivier@redhat.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Laurent Vivier , David Gibson X-Mailman-Version: 3.3.8 Precedence: list List-Id: Development discussion and patches for passt Archived-At: Archived-At: List-Archive: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: If buffer is not aligned use sum_16b() only on the not aligned part, and then use csum_avx2() on the remaining part Remove unneeded now function csum_unaligned(). Signed-off-by: Laurent Vivier Reviewed-by: David Gibson --- Notes: v3: - Add David's R-b v2: - use ROUND_UP() and sizeof(__m256i) - fix function comment - remove csum_unaligned() and use csum() instead checksum.c | 47 ++++++++++++++++++++++++----------------------- 1 file changed, 24 insertions(+), 23 deletions(-) diff --git a/checksum.c b/checksum.c index f21c9b7a14d1..65486b4625ba 100644 --- a/checksum.c +++ b/checksum.c @@ -56,6 +56,8 @@ #include #include +#include "util.h" + /* Checksums are optional for UDP over IPv4, so we usually just set * them to 0. Change this to 1 to calculate real UDP over IPv4 * checksums @@ -110,20 +112,7 @@ uint16_t csum_fold(uint32_t sum) return sum; } -/** - * csum_unaligned() - Compute TCP/IP-style checksum for not 32-byte aligned data - * @buf: Input data - * @len: Input length - * @init: Initial 32-bit checksum, 0 for no pre-computed checksum - * - * Return: 16-bit IPv4-style checksum - */ -/* NOLINTNEXTLINE(clang-diagnostic-unknown-attributes) */ -__attribute__((optimize("-fno-strict-aliasing"))) /* See csum_16b() */ -uint16_t csum_unaligned(const void *buf, size_t len, uint32_t init) -{ - return (uint16_t)~csum_fold(sum_16b(buf, len) + init); -} +uint16_t csum(const void *buf, size_t len, uint32_t init); /** * csum_ip4_header() - Calculate and set IPv4 header checksum @@ -132,7 +121,7 @@ uint16_t csum_unaligned(const void *buf, size_t len, uint32_t init) void csum_ip4_header(struct iphdr *ip4h) { ip4h->check = 0; - ip4h->check = csum_unaligned(ip4h, (size_t)ip4h->ihl * 4, 0); + ip4h->check = csum(ip4h, (size_t)ip4h->ihl * 4, 0); } /** @@ -159,7 +148,7 @@ void csum_udp4(struct udphdr *udp4hr, + htons(IPPROTO_UDP); /* Add in partial checksum for the UDP header alone */ psum += sum_16b(udp4hr, sizeof(*udp4hr)); - udp4hr->check = csum_unaligned(payload, len, psum); + udp4hr->check = csum(payload, len, psum); } } @@ -178,7 +167,7 @@ void csum_icmp4(struct icmphdr *icmp4hr, const void *payload, size_t len) /* Partial checksum for ICMP header alone */ psum = sum_16b(icmp4hr, sizeof(*icmp4hr)); - icmp4hr->checksum = csum_unaligned(payload, len, psum); + icmp4hr->checksum = csum(payload, len, psum); } /** @@ -199,7 +188,7 @@ void csum_udp6(struct udphdr *udp6hr, udp6hr->check = 0; /* Add in partial checksum for the UDP header alone */ psum += sum_16b(udp6hr, sizeof(*udp6hr)); - udp6hr->check = csum_unaligned(payload, len, psum); + udp6hr->check = csum(payload, len, psum); } /** @@ -222,7 +211,7 @@ void csum_icmp6(struct icmp6hdr *icmp6hr, icmp6hr->icmp6_cksum = 0; /* Add in partial checksum for the ICMPv6 header alone */ psum += sum_16b(icmp6hr, sizeof(*icmp6hr)); - icmp6hr->icmp6_cksum = csum_unaligned(payload, len, psum); + icmp6hr->icmp6_cksum = csum(payload, len, psum); } #ifdef __AVX2__ @@ -397,17 +386,29 @@ less_than_128_bytes: /** * csum() - Compute TCP/IP-style checksum - * @buf: Input buffer, must be aligned to 32-byte boundary + * @buf: Input buffer * @len: Input length * @init: Initial 32-bit checksum, 0 for no pre-computed checksum * - * Return: 16-bit folded, complemented checksum sum + * Return: 16-bit folded, complemented checksum */ /* NOLINTNEXTLINE(clang-diagnostic-unknown-attributes) */ __attribute__((optimize("-fno-strict-aliasing"))) /* See csum_16b() */ uint16_t csum(const void *buf, size_t len, uint32_t init) { - return (uint16_t)~csum_fold(csum_avx2(buf, len, init)); + intptr_t align = ROUND_UP((intptr_t)buf, sizeof(__m256i)); + unsigned int pad = align - (intptr_t)buf; + + if (len < pad) + pad = len; + + if (pad) + init += sum_16b(buf, pad); + + if (len > pad) + init = csum_avx2((void *)align, len - pad, init); + + return (uint16_t)~csum_fold(init); } #else /* __AVX2__ */ @@ -424,7 +425,7 @@ uint16_t csum(const void *buf, size_t len, uint32_t init) __attribute__((optimize("-fno-strict-aliasing"))) /* See csum_16b() */ uint16_t csum(const void *buf, size_t len, uint32_t init) { - return csum_unaligned(buf, len, init); + return (uint16_t)~csum_fold(sum_16b(buf, len) + init); } #endif /* !__AVX2__ */ -- 2.42.0