[RFC PATCH v2 05/13] af_vsock: implement send logic for SOCK_SEQPACKET
From: Arseny Krasnov <hidden>
Date: 2021-01-15 05:43:42
Also in:
kvm, lkml
Subsystem:
networking [general], the rest, vm sockets (af_vsock) · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, Stefano Garzarella
This adds some logic to current stream enqueue function for SEQPACKET support: 1) Send record begin marker with length of record. 2) Return value from enqueue function is wholevrecord length or error for SOCK_SEQPACKET. Signed-off-by: Arseny Krasnov <redacted> --- include/net/af_vsock.h | 1 + net/vmw_vsock/af_vsock.c | 32 ++++++++++++++++++++++++++++---- 2 files changed, 29 insertions(+), 4 deletions(-)
diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
index 46073842d489..ec6bf4600ef8 100644
--- a/include/net/af_vsock.h
+++ b/include/net/af_vsock.h@@ -136,6 +136,7 @@ struct vsock_transport { bool (*stream_allow)(u32 cid, u32 port); /* SEQ_PACKET. */ + bool (*seqpacket_seq_send_len)(struct vsock_sock *, size_t len); size_t (*seqpacket_seq_get_len)(struct vsock_sock *); ssize_t (*seqpacket_dequeue)(struct vsock_sock *, struct msghdr *, size_t len, int flags);
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index 5bf887190881..4a7cdf7756c0 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c@@ -1683,8 +1683,8 @@ static int vsock_stream_getsockopt(struct socket *sock, return 0; } -static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg, - size_t len) +static int vsock_connectible_sendmsg(struct socket *sock, struct msghdr *msg, + size_t len) { struct sock *sk; struct vsock_sock *vsk;
@@ -1737,6 +1737,12 @@ static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg, if (err < 0) goto out; + if (sk->sk_type == SOCK_SEQPACKET) { + err = transport->seqpacket_seq_send_len(vsk, len); + if (err < 0) + goto out; + } + while (total_written < len) { ssize_t written;
@@ -1815,13 +1821,31 @@ static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg, } out_err: - if (total_written > 0) - err = total_written; + if (total_written > 0) { + /* Return number of written bytes only if: + * 1) SOCK_STREAM socket. + * 2) SOCK_SEQPACKET socket when whole buffer is sent. + */ + if (sk->sk_type == SOCK_STREAM || total_written == len) + err = total_written; + } out: release_sock(sk); return err; } +static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg, + size_t len) +{ + return vsock_connectible_sendmsg(sock, msg, len); +} + +static int vsock_seqpacket_sendmsg(struct socket *sock, struct msghdr *msg, + size_t len) +{ + return vsock_connectible_sendmsg(sock, msg, len); +} + static int vsock_wait_data(struct sock *sk, struct wait_queue_entry *wait, long timeout, struct vsock_transport_recv_notify_data *recv_data,
--
2.25.1