Commit e993ffe3 authored by Pavel Begunkov's avatar Pavel Begunkov Committed by Jens Axboe
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net: flag sockets supporting msghdr originated zerocopy 



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: default avatarPavel Begunkov <asml.silence@gmail.com>
Acked-by: default avatarJakub Kicinski <kuba@kernel.org>
Link: https://lore.kernel.org/r/3dafafab822b1c66308bb58a0ac738b1e3f53f74.1666346426.git.asml.silence@gmail.com


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 996d3efe

include/linux/net.h

+1 −0
Original line number Diff line number Diff line
@@ -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

/**

net/ipv4/tcp.c

+1 −0
Original line number Diff line number Diff line
@@ -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);

net/ipv4/udp.c

+1 −0
Original line number Diff line number Diff line
@@ -1624,6 +1624,7 @@ 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;

}