On Fri, Sep 20, 2024 at 11:56:31AM +0200, Laurent Vivier wrote:As tcp_update_check_tcp4() and tcp_update_check_tcp6() compute the checksum using the TCP header and the TCP payload, it is clearer to use a pointer to tcp_payload_t that includes tcphdr and payload rather than a pointer to tcphdr (and guessing TCP header is followed by the payload). Move tcp_payload_t and tcp_flags_t to tcp_internal.h. (They will be used also by vhost-user). Signed-off-by: Laurent Vivier <lvivier(a)redhat.com>Reviewed-by: David Gibson <david(a)gibson.dropbear.id.au> Of course, it will conflict with Jon's pending changes merging the payload and flags arrays.--- tcp.c | 42 ++++++++++++++++++++++-------------------- tcp_buf.c | 29 ----------------------------- tcp_internal.h | 29 +++++++++++++++++++++++++++++ 3 files changed, 51 insertions(+), 49 deletions(-) diff --git a/tcp.c b/tcp.c index 1962fcc469ed..c9472d905520 100644 --- a/tcp.c +++ b/tcp.c @@ -757,32 +757,34 @@ static void tcp_sock_set_bufsize(const struct ctx *c, int s) /** * tcp_update_check_tcp4() - Update TCP checksum from stored one * @iph: IPv4 header - * @th: TCP header followed by TCP payload + * @bp: TCP header followed by TCP payload */ -static void tcp_update_check_tcp4(const struct iphdr *iph, struct tcphdr *th) +static void tcp_update_check_tcp4(const struct iphdr *iph, + struct tcp_payload_t *bp) { uint16_t l4len = ntohs(iph->tot_len) - sizeof(struct iphdr); struct in_addr saddr = { .s_addr = iph->saddr }; struct in_addr daddr = { .s_addr = iph->daddr }; uint32_t sum = proto_ipv4_header_psum(l4len, IPPROTO_TCP, saddr, daddr); - th->check = 0; - th->check = csum(th, l4len, sum); + bp->th.check = 0; + bp->th.check = csum(bp, l4len, sum); } /** * tcp_update_check_tcp6() - Calculate TCP checksum for IPv6 * @ip6h: IPv6 header - * @th: TCP header followed by TCP payload + * @bp: TCP header followed by TCP payload */ -static void tcp_update_check_tcp6(struct ipv6hdr *ip6h, struct tcphdr *th) +static void tcp_update_check_tcp6(const struct ipv6hdr *ip6h, + struct tcp_payload_t *bp) { uint16_t l4len = ntohs(ip6h->payload_len); uint32_t sum = proto_ipv6_header_psum(l4len, IPPROTO_TCP, &ip6h->saddr, &ip6h->daddr); - th->check = 0; - th->check = csum(th, l4len, sum); + bp->th.check = 0; + bp->th.check = csum(bp, l4len, sum); } /** @@ -902,7 +904,7 @@ static void tcp_fill_header(struct tcphdr *th, * @conn: Connection pointer * @taph: tap backend specific header * @iph: Pointer to IPv4 header - * @th: Pointer to TCP header + * @bp: Pointer to TCP header followed by TCP payload * @dlen: TCP payload length * @check: Checksum, if already known * @seq: Sequence number for this segment @@ -912,14 +914,14 @@ static void tcp_fill_header(struct tcphdr *th, */ static size_t tcp_fill_headers4(const struct tcp_tap_conn *conn, struct tap_hdr *taph, - struct iphdr *iph, struct tcphdr *th, + struct iphdr *iph, struct tcp_payload_t *bp, size_t dlen, const uint16_t *check, uint32_t seq, bool no_tcp_csum) { const struct flowside *tapside = TAPFLOW(conn); const struct in_addr *src4 = inany_v4(&tapside->oaddr); const struct in_addr *dst4 = inany_v4(&tapside->eaddr); - size_t l4len = dlen + sizeof(*th); + size_t l4len = dlen + sizeof(bp->th); size_t l3len = l4len + sizeof(*iph); ASSERT(src4 && dst4); @@ -931,12 +933,12 @@ static size_t tcp_fill_headers4(const struct tcp_tap_conn *conn, iph->check = check ? *check : csum_ip4_header(l3len, IPPROTO_TCP, *src4, *dst4); - tcp_fill_header(th, conn, seq); + tcp_fill_header(&bp->th, conn, seq); if (no_tcp_csum) - th->check = 0; + bp->th.check = 0; else - tcp_update_check_tcp4(iph, th); + tcp_update_check_tcp4(iph, bp); tap_hdr_update(taph, l3len + sizeof(struct ethhdr)); @@ -948,7 +950,7 @@ static size_t tcp_fill_headers4(const struct tcp_tap_conn *conn, * @conn: Connection pointer * @taph: tap backend specific header * @ip6h: Pointer to IPv6 header - * @th: Pointer to TCP header + * @bp: Pointer to TCP header followed by TCP payload * @dlen: TCP payload length * @check: Checksum, if already known * @seq: Sequence number for this segment @@ -958,11 +960,11 @@ static size_t tcp_fill_headers4(const struct tcp_tap_conn *conn, */ static size_t tcp_fill_headers6(const struct tcp_tap_conn *conn, struct tap_hdr *taph, - struct ipv6hdr *ip6h, struct tcphdr *th, + struct ipv6hdr *ip6h, struct tcp_payload_t *bp, size_t dlen, uint32_t seq, bool no_tcp_csum) { const struct flowside *tapside = TAPFLOW(conn); - size_t l4len = dlen + sizeof(*th); + size_t l4len = dlen + sizeof(bp->th); ip6h->payload_len = htons(l4len); ip6h->saddr = tapside->oaddr.a6; @@ -976,12 +978,12 @@ static size_t tcp_fill_headers6(const struct tcp_tap_conn *conn, ip6h->flow_lbl[1] = (conn->sock >> 8) & 0xff; ip6h->flow_lbl[2] = (conn->sock >> 0) & 0xff; - tcp_fill_header(th, conn, seq); + tcp_fill_header(&bp->th, conn, seq); if (no_tcp_csum) - th->check = 0; + bp->th.check = 0; else - tcp_update_check_tcp6(ip6h, th); + tcp_update_check_tcp6(ip6h, bp); tap_hdr_update(taph, l4len + sizeof(*ip6h) + sizeof(struct ethhdr)); diff --git a/tcp_buf.c b/tcp_buf.c index ffbff5e4b485..238827b01d90 100644 --- a/tcp_buf.c +++ b/tcp_buf.c @@ -38,35 +38,6 @@ (c->mode == MODE_PASTA ? 1 : TCP_FRAMES_MEM) /* Static buffers */ -/** - * struct tcp_payload_t - TCP header and data to send segments with payload - * @th: TCP header - * @data: TCP data - */ -struct tcp_payload_t { - struct tcphdr th; - uint8_t data[IP_MAX_MTU - sizeof(struct tcphdr)]; -#ifdef __AVX2__ -} __attribute__ ((packed, aligned(32))); /* For AVX2 checksum routines */ -#else -} __attribute__ ((packed, aligned(__alignof__(unsigned int)))); -#endif - -/** - * struct tcp_flags_t - TCP header and data to send zero-length - * segments (flags) - * @th: TCP header - * @opts TCP options - */ -struct tcp_flags_t { - struct tcphdr th; - char opts[OPT_MSS_LEN + OPT_WS_LEN + 1]; -#ifdef __AVX2__ -} __attribute__ ((packed, aligned(32))); -#else -} __attribute__ ((packed, aligned(__alignof__(unsigned int)))); -#endif - /* Ethernet header for IPv4 frames */ static struct ethhdr tcp4_eth_src; diff --git a/tcp_internal.h b/tcp_internal.h index de06db1438d6..2f74ffeff8f3 100644 --- a/tcp_internal.h +++ b/tcp_internal.h @@ -63,6 +63,35 @@ enum tcp_iov_parts { TCP_NUM_IOVS }; +/** + * struct tcp_payload_t - TCP header and data to send segments with payload + * @th: TCP header + * @data: TCP data + */ +struct tcp_payload_t { + struct tcphdr th; + uint8_t data[IP_MAX_MTU - sizeof(struct tcphdr)]; +#ifdef __AVX2__ +} __attribute__ ((packed, aligned(32))); /* For AVX2 checksum routines */ +#else +} __attribute__ ((packed, aligned(__alignof__(unsigned int)))); +#endif + +/** + * struct tcp_flags_t - TCP header and data to send zero-length + * segments (flags) + * @th: TCP header + * @opts TCP options + */ +struct tcp_flags_t { + struct tcphdr th; + char opts[OPT_MSS_LEN + OPT_WS_LEN + 1]; +#ifdef __AVX2__ +} __attribute__ ((packed, aligned(32))); +#else +} __attribute__ ((packed, aligned(__alignof__(unsigned int)))); +#endif + extern char tcp_buf_discard [MAX_WINDOW]; void conn_flag_do(const struct ctx *c, struct tcp_tap_conn *conn,-- David Gibson (he or they) | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you, not the other way | around. http://www.ozlabs.org/~dgibson