From: Laurent Vivier <lvivier@redhat.com>
To: passt-dev@passt.top
Cc: Laurent Vivier <lvivier@redhat.com>,
David Gibson <david@gibson.dropbear.id.au>
Subject: [PATCH v6 1/5] tcp: Use tcp_payload_t rather than tcphdr
Date: Thu, 3 Oct 2024 16:51:04 +0200 [thread overview]
Message-ID: <20241003145108.2227355-2-lvivier@redhat.com> (raw)
In-Reply-To: <20241003145108.2227355-1-lvivier@redhat.com>
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@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
---
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,
--
@@ -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,
--
2.46.0
next prev parent reply other threads:[~2024-10-03 14:51 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-03 14:51 [PATCH v6 0/5] tcp: use csum_iov() in tcp_update_check_tcp[4|6]() Laurent Vivier
2024-10-03 14:51 ` Laurent Vivier [this message]
2024-10-03 14:51 ` [PATCH v6 2/5] pcap: Add an offset argument in pcap_iov() Laurent Vivier
2024-10-03 14:51 ` [PATCH v6 3/5] checksum: Add an offset argument in csum_iov() Laurent Vivier
2024-10-03 14:51 ` [PATCH v6 4/5] tcp: Update TCP checksum using an iovec array Laurent Vivier
2024-10-03 14:55 ` Laurent Vivier
2024-10-04 6:56 ` Stefano Brivio
2024-10-03 14:51 ` [PATCH v6 5/5] udp: Update UDP " Laurent Vivier
2024-10-04 13:10 ` [PATCH v6 0/5] tcp: use csum_iov() in tcp_update_check_tcp[4|6]() Stefano Brivio
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