* [MPTCP] [PATCH 1/3] mptcp: use sk_page_frag() in sendmsg
@ 2019-05-07 13:15 Paolo Abeni
0 siblings, 0 replies; 2+ messages in thread
From: Paolo Abeni @ 2019-05-07 13:15 UTC (permalink / raw)
To: mptcp
[-- Attachment #1: Type: text/plain, Size: 3344 bytes --]
This clean-up a bit the send path, and allows better performances.
RFC -> v1:
- use sk's page_frag
- fix error handling on memory pressure
Signed-off-by: Paolo Abeni <pabeni(a)redhat.com>
--
can be squashed into commit cc0d09002896 ("mptcp: Implement MPTCP receive path")
---
net/mptcp/protocol.c | 41 ++++++++++++++++++++---------------------
1 file changed, 20 insertions(+), 21 deletions(-)
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 8028bb7ae321..0cece994dd9a 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -53,10 +53,11 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
struct mptcp_sock *msk = mptcp_sk(sk);
int mss_now, size_goal, poffset, ret;
struct mptcp_ext *mpext = NULL;
- struct page *page = NULL;
+ struct page_frag *pfrag;
struct sk_buff *skb;
struct sock *ssk;
size_t psize;
+ long timeo;
pr_debug("msk=%p", msk);
if (msk->subflow) {
@@ -81,33 +82,33 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
goto put_out;
}
- /* Initial experiment: new page per send. Real code will
- * maintain list of active pages and DSS mappings, append to the
- * end and honor zerocopy
+ lock_sock(sk);
+ lock_sock(ssk);
+ timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
+
+ /* use the mptcp page cache so that we can easily move the data
+ * from one substream to another, but do per subflow memory accounting
*/
- page = alloc_page(GFP_KERNEL);
- if (!page) {
- ret = -ENOMEM;
- goto put_out;
+ pfrag = sk_page_frag(sk);
+ while (!sk_page_frag_refill(ssk, pfrag)) {
+ ret = sk_stream_wait_memory(ssk, &timeo);
+ if (ret)
+ goto release_out;
}
/* Copy to page */
- poffset = 0;
+ poffset = pfrag->offset;
pr_debug("left=%zu", msg_data_left(msg));
- psize = copy_page_from_iter(page, poffset,
+ psize = copy_page_from_iter(pfrag->page, poffset,
min_t(size_t, msg_data_left(msg),
- PAGE_SIZE),
+ pfrag->size - poffset),
&msg->msg_iter);
pr_debug("left=%zu", msg_data_left(msg));
-
if (!psize) {
ret = -EINVAL;
- goto put_out;
+ goto release_out;
}
- lock_sock(sk);
- lock_sock(ssk);
-
/* Mark the end of the previous write so the beginning of the
* next write (with its own mptcp skb extension data) is not
* collapsed.
@@ -117,8 +118,8 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
TCP_SKB_CB(skb)->eor = 1;
mss_now = tcp_send_mss(ssk, &size_goal, msg->msg_flags);
-
- ret = do_tcp_sendpages(ssk, page, poffset, min_t(int, size_goal, psize),
+ psize = min_t(int, size_goal, psize);
+ ret = do_tcp_sendpages(ssk, pfrag->page, poffset, psize,
msg->msg_flags | MSG_SENDPAGE_NOTLAST);
if (ret <= 0)
goto release_out;
@@ -144,6 +145,7 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
mpext->checksum, mpext->dsn64);
} /* TODO: else fallback */
+ pfrag->offset += ret;
msk->write_seq += ret;
subflow_ctx(ssk)->rel_write_seq += ret;
@@ -154,9 +156,6 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
release_sock(sk);
put_out:
- if (page)
- put_page(page);
-
sock_put(ssk);
return ret;
}
--
2.20.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [MPTCP] [PATCH 1/3] mptcp: use sk_page_frag() in sendmsg
@ 2019-04-15 15:30 Paolo Abeni
0 siblings, 0 replies; 2+ messages in thread
From: Paolo Abeni @ 2019-04-15 15:30 UTC (permalink / raw)
To: mptcp
[-- Attachment #1: Type: text/plain, Size: 3258 bytes --]
This clean-up a bit the send path, and allows better performances.
RFC -> v1:
- use sk's page_frag
- fix error handling on memory pressure
Signed-off-by: Paolo Abeni <pabeni(a)redhat.com>
---
net/mptcp/protocol.c | 41 ++++++++++++++++++++---------------------
1 file changed, 20 insertions(+), 21 deletions(-)
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 1e73e307a6d2..1b843c5e2dbc 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -52,10 +52,11 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
struct mptcp_sock *msk = mptcp_sk(sk);
int mss_now, size_goal, poffset, ret;
struct mptcp_ext *mpext = NULL;
- struct page *page = NULL;
+ struct page_frag *pfrag;
struct sk_buff *skb;
struct sock *ssk;
size_t psize;
+ long timeo;
pr_debug("msk=%p", msk);
if (msk->subflow) {
@@ -80,33 +81,33 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
goto put_out;
}
- /* Initial experiment: new page per send. Real code will
- * maintain list of active pages and DSS mappings, append to the
- * end and honor zerocopy
+ lock_sock(sk);
+ lock_sock(ssk);
+ timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
+
+ /* use the mptcp page cache so that we can easily move the data
+ * from one substream to another, but do per subflow memory accounting
*/
- page = alloc_page(GFP_KERNEL);
- if (!page) {
- ret = -ENOMEM;
- goto put_out;
+ pfrag = sk_page_frag(sk);
+ while (!sk_page_frag_refill(ssk, pfrag)) {
+ ret = sk_stream_wait_memory(ssk, &timeo);
+ if (ret)
+ goto release_out;
}
/* Copy to page */
- poffset = 0;
+ poffset = pfrag->offset;
pr_debug("left=%zu", msg_data_left(msg));
- psize = copy_page_from_iter(page, poffset,
+ psize = copy_page_from_iter(pfrag->page, poffset,
min_t(size_t, msg_data_left(msg),
- PAGE_SIZE),
+ pfrag->size - poffset),
&msg->msg_iter);
pr_debug("left=%zu", msg_data_left(msg));
-
if (!psize) {
ret = -EINVAL;
- goto put_out;
+ goto release_out;
}
- lock_sock(sk);
- lock_sock(ssk);
-
/* Mark the end of the previous write so the beginning of the
* next write (with its own mptcp skb extension data) is not
* collapsed.
@@ -116,8 +117,8 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
TCP_SKB_CB(skb)->eor = 1;
mss_now = tcp_send_mss(ssk, &size_goal, msg->msg_flags);
-
- ret = do_tcp_sendpages(ssk, page, poffset, min_t(int, size_goal, psize),
+ psize = min_t(int, size_goal, psize);
+ ret = do_tcp_sendpages(ssk, pfrag->page, poffset, psize,
msg->msg_flags | MSG_SENDPAGE_NOTLAST);
if (ret <= 0)
goto release_out;
@@ -143,6 +144,7 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
mpext->checksum, mpext->dsn64);
} /* TODO: else fallback */
+ pfrag->offset += ret;
msk->write_seq += ret;
subflow_ctx(ssk)->rel_write_seq += ret;
@@ -153,9 +155,6 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
release_sock(sk);
put_out:
- if (page)
- put_page(page);
-
sock_put(ssk);
return ret;
}
--
2.20.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
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