From: David Gibson <david@gibson.dropbear.id.au>
To: Stefano Brivio <sbrivio@redhat.com>, passt-dev@passt.top
Cc: David Gibson <david@gibson.dropbear.id.au>
Subject: [PATCH v3 05/18] tcp: Improve interface to tcp_l2_buf_flush()
Date: Fri, 6 Jan 2023 11:43:09 +1100 [thread overview]
Message-ID: <20230106004322.985665-6-david@gibson.dropbear.id.au> (raw)
In-Reply-To: <20230106004322.985665-1-david@gibson.dropbear.id.au>
Currently this takes a msghdr, but the only thing we actually care
about in there is the io vector. Make it take an io vector directly.
We also have a weird side effect of zeroing @buf_used. Just pass this
by value and zero it in the caller instead.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
tcp.c | 63 ++++++++++++++++++++++++-----------------------------------
1 file changed, 26 insertions(+), 37 deletions(-)
diff --git a/tcp.c b/tcp.c
index 5efef6f..d96122d 100644
--- a/tcp.c
+++ b/tcp.c
@@ -1413,22 +1413,27 @@ static int tcp_l2_buf_write_one(struct ctx *c, const struct iovec *iov)
/**
* tcp_l2_buf_flush_passt() - Send a message on the passt tap interface
* @c: Execution context
- * @mh: Message header that was partially sent by sendmsg()
+ * @iov: Pointer to array of buffers, one per frame
+ * @n: Number of buffers/frames to flush
*/
-static void tcp_l2_buf_flush_passt(const struct ctx *c, const struct msghdr *mh)
+static void tcp_l2_buf_flush_passt(const struct ctx *c,
+ const struct iovec *iov, size_t n)
{
+ struct msghdr mh = {
+ .msg_iov = (void *)iov,
+ .msg_iovlen = n,
+ };
size_t end = 0, missing;
- struct iovec *iov;
unsigned int i;
ssize_t sent;
char *p;
- sent = sendmsg(c->fd_tap, mh, MSG_NOSIGNAL | MSG_DONTWAIT);
+ sent = sendmsg(c->fd_tap, &mh, MSG_NOSIGNAL | MSG_DONTWAIT);
if (sent < 0)
return;
/* Ensure a complete last message on partial sendmsg() */
- for (i = 0, iov = mh->msg_iov; i < mh->msg_iovlen; i++, iov++) {
+ for (i = 0; i < n; i++, iov++) {
end += iov->iov_len;
if (end >= (size_t)sent)
break;
@@ -1446,30 +1451,24 @@ static void tcp_l2_buf_flush_passt(const struct ctx *c, const struct msghdr *mh)
/**
* tcp_l2_flags_buf_flush() - Send out buffers for segments with or without data
* @c: Execution context
- * @mh: Message header pointing to buffers, msg_iovlen not set
- * @buf_used: Pointer to count of used buffers, set to 0 on return
*/
-static void tcp_l2_buf_flush(struct ctx *c, struct msghdr *mh,
- unsigned int *buf_used)
+static void tcp_l2_buf_flush(struct ctx *c, const struct iovec *iov, size_t n)
{
- if (!(mh->msg_iovlen = *buf_used))
+ size_t i;
+
+ if (!n)
return;
if (c->mode == MODE_PASST) {
- tcp_l2_buf_flush_passt(c, mh);
+ tcp_l2_buf_flush_passt(c, iov, n);
} else {
- size_t i;
-
- for (i = 0; i < mh->msg_iovlen; i++) {
- struct iovec *iov = &mh->msg_iov[i];
-
- if (tcp_l2_buf_write_one(c, iov))
+ for (i = 0; i < n; i++) {
+ if (tcp_l2_buf_write_one(c, iov + i))
i--;
}
}
- *buf_used = 0;
- pcap_multiple(mh->msg_iov, mh->msg_iovlen, sizeof(uint32_t));
+ pcap_multiple(iov, n, sizeof(uint32_t));
}
/**
@@ -1478,16 +1477,11 @@ static void tcp_l2_buf_flush(struct ctx *c, struct msghdr *mh,
*/
static void tcp_l2_flags_buf_flush(struct ctx *c)
{
- struct msghdr mh = { 0 };
- unsigned int *buf_used;
-
- mh.msg_iov = tcp6_l2_flags_iov;
- buf_used = &tcp6_l2_flags_buf_used;
- tcp_l2_buf_flush(c, &mh, buf_used);
+ tcp_l2_buf_flush(c, tcp6_l2_flags_iov, tcp6_l2_flags_buf_used);
+ tcp6_l2_flags_buf_used = 0;
- mh.msg_iov = tcp4_l2_flags_iov;
- buf_used = &tcp4_l2_flags_buf_used;
- tcp_l2_buf_flush(c, &mh, buf_used);
+ tcp_l2_buf_flush(c, tcp4_l2_flags_iov, tcp4_l2_flags_buf_used);
+ tcp4_l2_flags_buf_used = 0;
}
/**
@@ -1496,16 +1490,11 @@ static void tcp_l2_flags_buf_flush(struct ctx *c)
*/
static void tcp_l2_data_buf_flush(struct ctx *c)
{
- struct msghdr mh = { 0 };
- unsigned int *buf_used;
-
- mh.msg_iov = tcp6_l2_iov;
- buf_used = &tcp6_l2_buf_used;
- tcp_l2_buf_flush(c, &mh, buf_used);
+ tcp_l2_buf_flush(c, tcp6_l2_iov, tcp6_l2_buf_used);
+ tcp6_l2_buf_used = 0;
- mh.msg_iov = tcp4_l2_iov;
- buf_used = &tcp4_l2_buf_used;
- tcp_l2_buf_flush(c, &mh, buf_used);
+ tcp_l2_buf_flush(c, tcp4_l2_iov, tcp4_l2_buf_used);
+ tcp4_l2_buf_used = 0;
}
/**
--
@@ -1413,22 +1413,27 @@ static int tcp_l2_buf_write_one(struct ctx *c, const struct iovec *iov)
/**
* tcp_l2_buf_flush_passt() - Send a message on the passt tap interface
* @c: Execution context
- * @mh: Message header that was partially sent by sendmsg()
+ * @iov: Pointer to array of buffers, one per frame
+ * @n: Number of buffers/frames to flush
*/
-static void tcp_l2_buf_flush_passt(const struct ctx *c, const struct msghdr *mh)
+static void tcp_l2_buf_flush_passt(const struct ctx *c,
+ const struct iovec *iov, size_t n)
{
+ struct msghdr mh = {
+ .msg_iov = (void *)iov,
+ .msg_iovlen = n,
+ };
size_t end = 0, missing;
- struct iovec *iov;
unsigned int i;
ssize_t sent;
char *p;
- sent = sendmsg(c->fd_tap, mh, MSG_NOSIGNAL | MSG_DONTWAIT);
+ sent = sendmsg(c->fd_tap, &mh, MSG_NOSIGNAL | MSG_DONTWAIT);
if (sent < 0)
return;
/* Ensure a complete last message on partial sendmsg() */
- for (i = 0, iov = mh->msg_iov; i < mh->msg_iovlen; i++, iov++) {
+ for (i = 0; i < n; i++, iov++) {
end += iov->iov_len;
if (end >= (size_t)sent)
break;
@@ -1446,30 +1451,24 @@ static void tcp_l2_buf_flush_passt(const struct ctx *c, const struct msghdr *mh)
/**
* tcp_l2_flags_buf_flush() - Send out buffers for segments with or without data
* @c: Execution context
- * @mh: Message header pointing to buffers, msg_iovlen not set
- * @buf_used: Pointer to count of used buffers, set to 0 on return
*/
-static void tcp_l2_buf_flush(struct ctx *c, struct msghdr *mh,
- unsigned int *buf_used)
+static void tcp_l2_buf_flush(struct ctx *c, const struct iovec *iov, size_t n)
{
- if (!(mh->msg_iovlen = *buf_used))
+ size_t i;
+
+ if (!n)
return;
if (c->mode == MODE_PASST) {
- tcp_l2_buf_flush_passt(c, mh);
+ tcp_l2_buf_flush_passt(c, iov, n);
} else {
- size_t i;
-
- for (i = 0; i < mh->msg_iovlen; i++) {
- struct iovec *iov = &mh->msg_iov[i];
-
- if (tcp_l2_buf_write_one(c, iov))
+ for (i = 0; i < n; i++) {
+ if (tcp_l2_buf_write_one(c, iov + i))
i--;
}
}
- *buf_used = 0;
- pcap_multiple(mh->msg_iov, mh->msg_iovlen, sizeof(uint32_t));
+ pcap_multiple(iov, n, sizeof(uint32_t));
}
/**
@@ -1478,16 +1477,11 @@ static void tcp_l2_buf_flush(struct ctx *c, struct msghdr *mh,
*/
static void tcp_l2_flags_buf_flush(struct ctx *c)
{
- struct msghdr mh = { 0 };
- unsigned int *buf_used;
-
- mh.msg_iov = tcp6_l2_flags_iov;
- buf_used = &tcp6_l2_flags_buf_used;
- tcp_l2_buf_flush(c, &mh, buf_used);
+ tcp_l2_buf_flush(c, tcp6_l2_flags_iov, tcp6_l2_flags_buf_used);
+ tcp6_l2_flags_buf_used = 0;
- mh.msg_iov = tcp4_l2_flags_iov;
- buf_used = &tcp4_l2_flags_buf_used;
- tcp_l2_buf_flush(c, &mh, buf_used);
+ tcp_l2_buf_flush(c, tcp4_l2_flags_iov, tcp4_l2_flags_buf_used);
+ tcp4_l2_flags_buf_used = 0;
}
/**
@@ -1496,16 +1490,11 @@ static void tcp_l2_flags_buf_flush(struct ctx *c)
*/
static void tcp_l2_data_buf_flush(struct ctx *c)
{
- struct msghdr mh = { 0 };
- unsigned int *buf_used;
-
- mh.msg_iov = tcp6_l2_iov;
- buf_used = &tcp6_l2_buf_used;
- tcp_l2_buf_flush(c, &mh, buf_used);
+ tcp_l2_buf_flush(c, tcp6_l2_iov, tcp6_l2_buf_used);
+ tcp6_l2_buf_used = 0;
- mh.msg_iov = tcp4_l2_iov;
- buf_used = &tcp4_l2_buf_used;
- tcp_l2_buf_flush(c, &mh, buf_used);
+ tcp_l2_buf_flush(c, tcp4_l2_iov, tcp4_l2_buf_used);
+ tcp4_l2_buf_used = 0;
}
/**
--
2.39.0
next prev parent reply other threads:[~2023-01-06 0:43 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-06 0:43 [PATCH v3 00/18] RFC: Unify and simplify tap send path David Gibson
2023-01-06 0:43 ` [PATCH v3 01/18] pcap: Introduce pcap_frame() helper David Gibson
2023-01-06 0:43 ` [PATCH v3 02/18] pcap: Replace pcapm() with pcap_multiple() David Gibson
2023-01-06 0:43 ` [PATCH v3 03/18] tcp: Combine two parts of passt tap send path together David Gibson
2023-01-06 0:43 ` [PATCH v3 04/18] tcp: Don't compute total bytes in a message until we need it David Gibson
2023-01-06 0:43 ` David Gibson [this message]
2023-01-06 0:43 ` [PATCH v3 06/18] tcp: Combine two parts of pasta tap send path together David Gibson
2023-02-13 1:13 ` Stefano Brivio
2023-01-06 0:43 ` [PATCH v3 07/18] tap, tcp: Move tap send path to tap.c David Gibson
2023-01-06 0:43 ` [PATCH v3 08/18] util: Introduce hton*_constant() in place of #ifdefs David Gibson
2023-01-06 0:43 ` [PATCH v3 09/18] tcp, udp: Use named field initializers in iov_init functions David Gibson
2023-01-06 0:43 ` [PATCH v3 10/18] util: Parameterize ethernet header initializer macro David Gibson
2023-01-06 0:43 ` [PATCH v3 11/18] tcp: Remove redundant and incorrect initialization from *_iov_init() David Gibson
2023-01-06 0:43 ` [PATCH v3 12/18] tcp: Consolidate calculation of total frame size David Gibson
2023-01-06 0:43 ` [PATCH v3 13/18] tap: Add "tap headers" abstraction David Gibson
2023-01-06 0:43 ` [PATCH v3 14/18] tcp: Use abstracted tap header David Gibson
2023-01-06 0:43 ` [PATCH v3 15/18] tap: Use different io vector bases depending on tap type David Gibson
2023-01-06 0:43 ` [PATCH v3 16/18] udp: Use abstracted tap header David Gibson
2023-01-06 0:43 ` [PATCH v3 17/18] tap: Improve handling of partial frame sends David Gibson
2023-01-06 0:43 ` [PATCH v3 18/18] udp: Use tap_send_frames() David Gibson
2023-01-24 21:20 ` [PATCH v3 00/18] RFC: Unify and simplify tap send path Stefano Brivio
2023-01-25 3:13 ` David Gibson
2023-01-25 23:21 ` Stefano Brivio
2023-02-13 1:14 ` Stefano Brivio
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