sctp: add support for busy polling to sctp protocol (8465a5fc) · Commits · 戴 / test

The busy polling socket option adds support for sockets to busy wait on data arriving on the napi queue from which they have most recently received a frame. Currently only tcp and udp support this feature, but theres no reason sctp can't do so as well. Add it in so appliations can take advantage of it Signed-off-by:

Neil Horman <nhorman@tuxdriver.com> CC: Vlad Yasevich <vyasevich@gmail.com> CC: "David S. Miller" <davem@davemloft.net> CC: Daniel Borkmann <dborkman@redhat.com> CC: netdev@vger.kernel.org Acked-by:

Vlad Yasevich <vyasevich@gmail.com> Acked-by:

Daniel Borkmann <dborkman@redhat.com> Signed-off-by:

David S. Miller <davem@davemloft.net>

net/sctp/socket.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -71,6 +71,7 @@
		#include <net/route.h>
		#include <net/ipv6.h>
		#include <net/inet_common.h>
		#include <net/busy_poll.h>

		#include <linux/socket.h> /* for sa_family_t */
		#include <linux/export.h>
		@@ -6557,6 +6558,10 @@ static struct sk_buff sctp_skb_recv_datagram(struct sock sk, int flags,
		if (sk->sk_shutdown & RCV_SHUTDOWN)
		break;

		if (sk_can_busy_loop(sk) &&
		sk_busy_loop(sk, noblock))
		continue;

		/* User doesn't want to wait. */
		error = -EAGAIN;
		if (!timeo)

net/sctp/ulpqueue.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -38,6 +38,7 @@
		#include <linux/types.h>
		#include <linux/skbuff.h>
		#include <net/sock.h>
		#include <net/busy_poll.h>
		#include <net/sctp/structs.h>
		#include <net/sctp/sctp.h>
		#include <net/sctp/sm.h>
		@@ -204,6 +205,9 @@ int sctp_ulpq_tail_event(struct sctp_ulpq ulpq, struct sctp_ulpevent event)
		if (sock_flag(sk, SOCK_DEAD) \|\| (sk->sk_shutdown & RCV_SHUTDOWN))
		goto out_free;

		if (!sctp_ulpevent_is_notification(event))
		sk_mark_napi_id(sk, skb);

		/* Check if the user wishes to receive this event. */
		if (!sctp_ulpevent_is_enabled(event, &sctp_sk(sk)->subscribe))
		goto out_free;

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