From b2a9e4a855d0e5b4e3fdba5b126bcf00aa8f0ada Mon Sep 17 00:00:00 2001 From: Gregory Etelson Date: Thu, 29 Jul 2021 20:01:41 +0300 Subject: [PATCH] app/testpmd: fix Tx checksum calculation for tunnel csumonly engine calculates Tx checksum of a tunnelled packet for outer headers only or separately for outer and inner headers. The calculation method is determined by checksum configuration options. If Tx checksum calculation is separated, the inner headers are processed before outer headers. Inner headers processing sets checksum values to 0 unconditionally. If Tx configuration offloads inner checksums only, outer checksum calculation in software will read 0 instead of real values and produce wrong result. The patch zeroes inner checksums only before software calculation. Fixes: 6b520d54ebfe ("app/testpmd: use Tx preparation in checksum engine") Cc: stable@dpdk.org Signed-off-by: Gregory Etelson Acked-by: Ori Kam Acked-by: Ajit Khaparde Acked-by: Xiaoyun Li Acked-by: Olivier Matz --- app/test-pmd/csumonly.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) diff --git a/app/test-pmd/csumonly.c b/app/test-pmd/csumonly.c index 0161f72175..bd5ad64a57 100644 --- a/app/test-pmd/csumonly.c +++ b/app/test-pmd/csumonly.c @@ -480,17 +480,18 @@ process_inner_cksums(void *l3_hdr, const struct testpmd_offload_info *info, if (info->ethertype == _htons(RTE_ETHER_TYPE_IPV4)) { ipv4_hdr = l3_hdr; - ipv4_hdr->hdr_checksum = 0; ol_flags |= PKT_TX_IPV4; if (info->l4_proto == IPPROTO_TCP && tso_segsz) { ol_flags |= PKT_TX_IP_CKSUM; } else { - if (tx_offloads & DEV_TX_OFFLOAD_IPV4_CKSUM) + if (tx_offloads & DEV_TX_OFFLOAD_IPV4_CKSUM) { ol_flags |= PKT_TX_IP_CKSUM; - else + } else if (ipv4_hdr->hdr_checksum != 0) { + ipv4_hdr->hdr_checksum = 0; ipv4_hdr->hdr_checksum = rte_ipv4_cksum(ipv4_hdr); + } } } else if (info->ethertype == _htons(RTE_ETHER_TYPE_IPV6)) ol_flags |= PKT_TX_IPV6; @@ -501,10 +502,10 @@ process_inner_cksums(void *l3_hdr, const struct testpmd_offload_info *info, udp_hdr = (struct rte_udp_hdr *)((char *)l3_hdr + info->l3_len); /* do not recalculate udp cksum if it was 0 */ if (udp_hdr->dgram_cksum != 0) { - udp_hdr->dgram_cksum = 0; - if (tx_offloads & DEV_TX_OFFLOAD_UDP_CKSUM) + if (tx_offloads & DEV_TX_OFFLOAD_UDP_CKSUM) { ol_flags |= PKT_TX_UDP_CKSUM; - else { + } else { + udp_hdr->dgram_cksum = 0; udp_hdr->dgram_cksum = get_udptcp_checksum(l3_hdr, udp_hdr, info->ethertype); @@ -514,12 +515,12 @@ process_inner_cksums(void *l3_hdr, const struct testpmd_offload_info *info, ol_flags |= PKT_TX_UDP_SEG; } else if (info->l4_proto == IPPROTO_TCP) { tcp_hdr = (struct rte_tcp_hdr *)((char *)l3_hdr + info->l3_len); - tcp_hdr->cksum = 0; if (tso_segsz) ol_flags |= PKT_TX_TCP_SEG; - else if (tx_offloads & DEV_TX_OFFLOAD_TCP_CKSUM) + else if (tx_offloads & DEV_TX_OFFLOAD_TCP_CKSUM) { ol_flags |= PKT_TX_TCP_CKSUM; - else { + } else if (tcp_hdr->cksum != 0) { + tcp_hdr->cksum = 0; tcp_hdr->cksum = get_udptcp_checksum(l3_hdr, tcp_hdr, info->ethertype); @@ -529,13 +530,13 @@ process_inner_cksums(void *l3_hdr, const struct testpmd_offload_info *info, } else if (info->l4_proto == IPPROTO_SCTP) { sctp_hdr = (struct rte_sctp_hdr *) ((char *)l3_hdr + info->l3_len); - sctp_hdr->cksum = 0; /* sctp payload must be a multiple of 4 to be * offloaded */ if ((tx_offloads & DEV_TX_OFFLOAD_SCTP_CKSUM) && ((ipv4_hdr->total_length & 0x3) == 0)) { ol_flags |= PKT_TX_SCTP_CKSUM; - } else { + } else if (sctp_hdr->cksum != 0) { + sctp_hdr->cksum = 0; /* XXX implement CRC32c, example available in * RFC3309 */ } -- 2.20.1