From: Pavel Begunkov asml.silence@gmail.com
commit e993ffe3da4bcddea0536b03be1031bf35cd8d85 upstream.
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@vger.kernel.org # 6.0 Signed-off-by: Pavel Begunkov asml.silence@gmail.com Acked-by: Jakub Kicinski kuba@kernel.org Link: https://lore.kernel.org/r/3dafafab822b1c66308bb58a0ac738b1e3f53f74.166634642... Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/linux/net.h | 1 + net/ipv4/tcp.c | 1 + net/ipv4/udp.c | 1 + 3 files changed, 3 insertions(+)
--- 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 /** --- 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); --- 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);