We need an efficient way in io_uring to check whether a socket supports
zerocopy with msghdr provided ubuf_info. Add a new flag into the struct
socket flags fields.
Cc: <stable@xxxxxxxxxxxxxxx> # 6.0
Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
---
include/linux/net.h | 1 +
net/ipv4/tcp.c | 1 +
net/ipv4/udp.c | 1 +
3 files changed, 3 insertions(+)
diff --git a/include/linux/net.h b/include/linux/net.h
index 711c3593c3b8..18d942bbdf6e 100644
--- a/include/linux/net.h
+++ b/include/linux/net.h
@@ -41,6 +41,7 @@ struct net;
#define SOCK_NOSPACE 2
#define SOCK_PASSCRED 3
#define SOCK_PASSSEC 4
+#define SOCK_SUPPORT_ZC 5
#ifndef ARCH_HAS_SOCKET_TYPES
/**
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 0c51abeee172..aeb7b9eaddc7 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -457,6 +457,7 @@ void tcp_init_sock(struct sock *sk)
WRITE_ONCE(sk->sk_sndbuf, READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_wmem[1]));
WRITE_ONCE(sk->sk_rcvbuf, READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_rmem[1]));
+ set_bit(SOCK_SUPPORT_ZC, &sk->sk_socket->flags);
sk_sockets_allocated_inc(sk);
}
EXPORT_SYMBOL(tcp_init_sock);
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index d63118ce5900..03616fc5162c 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1620,6 +1620,7 @@ int udp_init_sock(struct sock *sk)
{
skb_queue_head_init(&udp_sk(sk)->reader_queue);
sk->sk_destruct = udp_destruct_sock;
+ set_bit(SOCK_SUPPORT_ZC, &sk->sk_socket->flags);
return 0;
}
EXPORT_SYMBOL_GPL(udp_init_sock);
--
2.38.0
