From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 9B71146CA2; Mon, 4 Aug 2025 05:54:38 +0200 (CEST) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 43D6E40264; Mon, 4 Aug 2025 05:54:38 +0200 (CEST) Received: from mail-pf1-f194.google.com (mail-pf1-f194.google.com [209.85.210.194]) by mails.dpdk.org (Postfix) with ESMTP id 23C43400D5 for ; Mon, 4 Aug 2025 05:54:37 +0200 (CEST) Received: by mail-pf1-f194.google.com with SMTP id d2e1a72fcca58-7425bd5a83aso2204901b3a.0 for ; Sun, 03 Aug 2025 20:54:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1754279676; x=1754884476; darn=dpdk.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=+QGlqQ13GswnGxhOD+bh6Ait02iThTyD7SqsN0rbHMs=; b=nQJgzY+RUe0Gkuf23mKfxjzgW6et943+FK3/mVyYWopTV31AMSZOzxWECPGKysDkTn HstA5NDmGOLzkuEGAx9zt9Tb44IaMOX1nqwsDOG0/Y/jX74GDe/PAasum7Rxvof6x3Zi jNqk/78WIPsn27V23FrS/aRWufBn3BxtV0tdxO3aO+q8HOVyB/2dVZXMN5FrJWTjzjlO vt8iAEl12DeN1XiQXn2Vin4vTZB8qRKcgIexunvoIUNiaHRIhuwd7tW4GAoMildJ7Sj8 yHlMCJm7QdKQRnpBcv18jhovGUrTIqA6Y+UcAeRybewSniFvPdnUdjUp02ud6kiepN0x w5lA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1754279676; x=1754884476; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=+QGlqQ13GswnGxhOD+bh6Ait02iThTyD7SqsN0rbHMs=; b=hXtyofzy1ttWq4KRHCSr7ps4e9KK1IBZz3it1tNcV5hvmbNb9UrXhmjknVDkQArpEs mXkcRXwdQL+wmcCqS29IidcfQQdOYScPy2cGg56+jZ2EaP97QOECrqrCm6OsnHqPI6up z6ASgwBUihXw1/gPvdCqgOsjkRrVyPFUoTyFiCqcJR9ZomIfudKAg9C/Wx9bNuSFDLJ9 6I8GyUidbQLKH9LrMWlhJiXpa4HSpYZruzp0q/BfnVjNzs4Zn06kihIeGCsaoDOcWKSL woWKwcTZ/1xwWaDR0N6TQnBva87Fwh9s8UR4C6izt8y/9rWp7wmfDG2DfWjBMJEAH3MF npVw== X-Gm-Message-State: AOJu0Yya2yavqokRXkd/K5V33tPyPR9KMh3Dl8IaRFgo3lt7+2G5slRw e1lDzHXQxR0rGvi7cVQNF/JbhIpVaaSo2rZJapdCy5Rl7ZmA5wGXce6S X-Gm-Gg: ASbGnctEhwSFiis8gDdve8hnwHUNH341HKWImrGXSQ63RosarGKe8nmhnmKhfJaw2UU d2u/m/8x5BzsTUR24pf7a/3PLytgO7BHkiSW4BJzsd2yfyqaGEi0GVzv9WvP/q+2Oh//Y8Nns/x zpZ4rAhKOgiHlixm4wD9JVCvKwTSAQVyrmsjQlp7my3nEsW9vc1o6SynRbM8rec1OxXPgwdv8fP eXW/zLC2RZR7vwFmCdHlePj2M/ZVQO+9tk7wO2l5mb2ewdYrcNvMGYKFMgl7psReDfsZgLH7Szy UNI4JO3ho3wOZa0OCGSOGT+70y97/GqdCKcK10phTui8ZI0OodC0WqXkZl9dmm1NSZktlXnrJUu eBSd5rgPRwsfAgmqQ9nX/l2x++By5BNA= X-Google-Smtp-Source: AGHT+IEfm/BGAQ9POLquVCyCzbcS33tcyA1QwTTFuyCj/OMSTqp54Fi1ebngeQJj+1/TE8TutM3tbQ== X-Received: by 2002:a05:6a20:94cb:b0:238:3f54:78ef with SMTP id adf61e73a8af0-23df916082cmr11158878637.45.1754279675879; Sun, 03 Aug 2025 20:54:35 -0700 (PDT) Received: from gmail.com ([115.190.40.15]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-76bdd2725c9sm7059510b3a.6.2025.08.03.20.54.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 03 Aug 2025 20:54:35 -0700 (PDT) From: Su Sai To: stephen@networkplumber.org Cc: dev@dpdk.org, Su Sai Subject: [v3] net/cksum: compute raw cksum for several segments Date: Mon, 4 Aug 2025 11:54:30 +0800 Message-Id: <20250804035430.4058391-1-spiderdetective.ss@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20250803090837.15589edd@hermes.local> References: <20250803090837.15589edd@hermes.local> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org The rte_raw_cksum_mbuf function is used to compute the raw checksum of a packet. If the packet payload stored in multi mbuf, the function will goto the hard case. In hard case, the variable 'tmp' is a type of uint32_t, so rte_bswap16 will drop high 16 bit. Meanwhile, the variable 'sum' is a type of uint32_t, so 'sum += tmp' will drop the carry when overflow. Both drop will make cksum incorrect. This commit fixes the above bug. Signed-off-by: Su Sai --- .mailmap | 1 + app/test/test_cksum.c | 106 ++++++++++++++++++++++++++++++++++++++++++ lib/net/rte_cksum.h | 27 +++++++++-- 3 files changed, 130 insertions(+), 4 deletions(-) diff --git a/.mailmap b/.mailmap index 34a99f93a1..1da1d9f8e1 100644 --- a/.mailmap +++ b/.mailmap @@ -1552,6 +1552,7 @@ Sunil Kumar Kori Sunil Pai G Sunil Uttarwar Sun Jiajia +Su Sai Sunyang Wu Surabhi Boob Suyang Ju diff --git a/app/test/test_cksum.c b/app/test/test_cksum.c index f2ab5af5a7..fb2e3cf9e6 100644 --- a/app/test/test_cksum.c +++ b/app/test/test_cksum.c @@ -85,6 +85,42 @@ static const char test_cksum_ipv4_opts_udp[] = { 0x00, 0x35, 0x00, 0x09, 0x89, 0x6f, 0x78, }; +/* + * generated in scapy with + * Ether()/IP()/TCP(options=[NOP,NOP,Timestamps])/os.urandom(113)) + */ +static const char test_cksum_ipv4_tcp_multi_segs[] = { + 0x00, 0x16, 0x3e, 0x0b, 0x6b, 0xd2, 0xee, 0xff, + 0xff, 0xff, 0xff, 0xff, 0x08, 0x00, 0x45, 0x00, + 0x00, 0xa5, 0x46, 0x10, 0x40, 0x00, 0x40, 0x06, + 0x80, 0xb5, 0xc0, 0xa8, 0xf9, 0x1d, 0xc0, 0xa8, + 0xf9, 0x1e, 0xdc, 0xa2, 0x14, 0x51, 0xbb, 0x8f, + 0xa0, 0x00, 0xe4, 0x7c, 0xe4, 0xb8, 0x80, 0x10, + 0x02, 0x00, 0x4b, 0xc1, 0x00, 0x00, 0x01, 0x01, + 0x08, 0x0a, 0x90, 0x60, 0xf4, 0xff, 0x03, 0xc5, + 0xb4, 0x19, 0x77, 0x34, 0xd4, 0xdc, 0x84, 0x86, + 0xff, 0x44, 0x09, 0x63, 0x36, 0x2e, 0x26, 0x9b, + 0x90, 0x70, 0xf2, 0xed, 0xc8, 0x5b, 0x87, 0xaa, + 0xb4, 0x67, 0x6b, 0x32, 0x3d, 0xc4, 0xbf, 0x15, + 0xa9, 0x16, 0x6c, 0x2a, 0x9d, 0xb2, 0xb7, 0x6b, + 0x58, 0x44, 0x58, 0x12, 0x4b, 0x8f, 0xe5, 0x12, + 0x11, 0x90, 0x94, 0x68, 0x37, 0xad, 0x0a, 0x9b, + 0xd6, 0x79, 0xf2, 0xb7, 0x31, 0xcf, 0x44, 0x22, + 0xc8, 0x99, 0x3f, 0xe5, 0xe7, 0xac, 0xc7, 0x0b, + 0x86, 0xdf, 0xda, 0xed, 0x0a, 0x0f, 0x86, 0xd7, + 0x48, 0xe2, 0xf1, 0xc2, 0x43, 0xed, 0x47, 0x3a, + 0xea, 0x25, 0x2d, 0xd6, 0x60, 0x38, 0x30, 0x07, + 0x28, 0xdd, 0x1f, 0x0c, 0xdd, 0x7b, 0x7c, 0xd9, + 0x35, 0x9d, 0x14, 0xaa, 0xc6, 0x35, 0xd1, 0x03, + 0x38, 0xb1, 0xf5, +}; + +static const uint8_t test_cksum_ipv4_tcp_multi_segs_len[] = { + 66, /* the first seg contains all headers, including L2 to L4 */ + 61, /* the second seg length is odd, test byte order independent */ + 52, /* three segs are sufficient to test the most complex scenarios */ +}; + /* test l3/l4 checksum api */ static int test_l4_cksum(struct rte_mempool *pktmbuf_pool, const char *pktdata, size_t len) @@ -223,6 +259,70 @@ test_l4_cksum(struct rte_mempool *pktmbuf_pool, const char *pktdata, size_t len) return -1; } +/* test l4 checksum api for a packet with multiple mbufs */ +static int +test_l4_cksum_multi_mbufs(struct rte_mempool *pktmbuf_pool, const char *pktdata, size_t len, + const uint8_t *segs, size_t segs_len) +{ + struct rte_mbuf *m[NB_MBUF] = {0}; + struct rte_mbuf *m_hdr = NULL; + struct rte_net_hdr_lens hdr_lens; + size_t i, off = 0; + uint32_t packet_type, l3; + void *l3_hdr; + char *data; + + for (i = 0; i < segs_len; i++) { + m[i] = rte_pktmbuf_alloc(pktmbuf_pool); + if (m[i] == NULL) + GOTO_FAIL("Cannot allocate mbuf"); + + data = rte_pktmbuf_append(m[i], segs[i]); + if (data == NULL) + GOTO_FAIL("Cannot append data"); + + rte_memcpy(data, pktdata + off, segs[i]); + off += segs[i]; + + if (m_hdr) { + if (rte_pktmbuf_chain(m_hdr, m[i])) + GOTO_FAIL("Cannot chain mbuf"); + } else { + m_hdr = m[i]; + } + } + + if (off != len) + GOTO_FAIL("Invalid segs"); + + packet_type = rte_net_get_ptype(m_hdr, &hdr_lens, RTE_PTYPE_ALL_MASK); + l3 = packet_type & RTE_PTYPE_L3_MASK; + + l3_hdr = rte_pktmbuf_mtod_offset(m_hdr, void *, hdr_lens.l2_len); + off = hdr_lens.l2_len + hdr_lens.l3_len; + + if (l3 == RTE_PTYPE_L3_IPV4 || l3 == RTE_PTYPE_L3_IPV4_EXT) { + if (rte_ipv4_udptcp_cksum_mbuf_verify(m_hdr, l3_hdr, off) != 0) + GOTO_FAIL("Invalid L4 checksum verification for multiple mbufs"); + } else if (l3 == RTE_PTYPE_L3_IPV6 || l3 == RTE_PTYPE_L3_IPV6_EXT) { + if (rte_ipv6_udptcp_cksum_mbuf_verify(m_hdr, l3_hdr, off) != 0) + GOTO_FAIL("Invalid L4 checksum verification for multiple mbufs"); + } + + for (i = 0; i < segs_len; i++) + rte_pktmbuf_free(m[i]); + + return 0; + +fail: + for (i = 0; i < segs_len; i++) { + if (m[i]) + rte_pktmbuf_free(m[i]); + } + + return -1; +} + static int test_cksum(void) { @@ -256,6 +356,12 @@ test_cksum(void) sizeof(test_cksum_ipv4_opts_udp)) < 0) GOTO_FAIL("checksum error on ipv4_opts_udp"); + if (test_l4_cksum_multi_mbufs(pktmbuf_pool, test_cksum_ipv4_tcp_multi_segs, + sizeof(test_cksum_ipv4_tcp_multi_segs), + test_cksum_ipv4_tcp_multi_segs_len, + sizeof(test_cksum_ipv4_tcp_multi_segs_len)) < 0) + GOTO_FAIL("checksum error on multi mbufs check"); + rte_mempool_free(pktmbuf_pool); return 0; diff --git a/lib/net/rte_cksum.h b/lib/net/rte_cksum.h index a8e8927952..679ba82eb6 100644 --- a/lib/net/rte_cksum.h +++ b/lib/net/rte_cksum.h @@ -80,6 +80,25 @@ __rte_raw_cksum_reduce(uint32_t sum) return (uint16_t)sum; } +/** + * @internal Reduce a sum to the non-complemented checksum. + * Helper routine for the rte_raw_cksum_mbuf(). + * + * @param sum + * Value of the sum. + * @return + * The non-complemented checksum. + */ +static inline uint16_t +__rte_raw_cksum_reduce_u64(uint64_t sum) +{ + uint32_t tmp; + + tmp = __rte_raw_cksum_reduce((uint32_t)sum); + tmp += __rte_raw_cksum_reduce((uint32_t)(sum >> 32)); + return __rte_raw_cksum_reduce(tmp); +} + /** * Process the non-complemented checksum of a buffer. * @@ -119,8 +138,8 @@ rte_raw_cksum_mbuf(const struct rte_mbuf *m, uint32_t off, uint32_t len, { const struct rte_mbuf *seg; const char *buf; - uint32_t sum, tmp; - uint32_t seglen, done; + uint32_t seglen, done, tmp; + uint64_t sum; /* easy case: all data in the first segment */ if (off + len <= rte_pktmbuf_data_len(m)) { @@ -157,7 +176,7 @@ rte_raw_cksum_mbuf(const struct rte_mbuf *m, uint32_t off, uint32_t len, for (;;) { tmp = __rte_raw_cksum(buf, seglen, 0); if (done & 1) - tmp = rte_bswap16((uint16_t)tmp); + tmp = rte_bswap32(tmp); sum += tmp; done += seglen; if (done == len) @@ -169,7 +188,7 @@ rte_raw_cksum_mbuf(const struct rte_mbuf *m, uint32_t off, uint32_t len, seglen = len - done; } - *cksum = __rte_raw_cksum_reduce(sum); + *cksum = __rte_raw_cksum_reduce_u64(sum); return 0; } -- 2.20.1