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Commit 8a681c36 authored by David Howells's avatar David Howells
Browse files

rxrpc: Add config to inject packet loss 



Add a configuration option to inject packet loss by discarding
approximately every 8th packet received and approximately every 8th DATA
packet transmitted.

Note that no locking is used, but it shouldn't really matter.

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
parent 71f3ca40

net/rxrpc/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -26,6 +26,13 @@ config AF_RXRPC_IPV6 
	  Say Y here to allow AF_RXRPC to use IPV6 UDP as well as IPV4 UDP as

	  its network transport.



config AF_RXRPC_INJECT_LOSS

	bool "Inject packet loss into RxRPC packet stream"

	depends on AF_RXRPC

	help

	  Say Y here to inject packet loss by discarding some received and some

	  transmitted packets.





config AF_RXRPC_DEBUG

	bool "RxRPC dynamic debugging"

net/rxrpc/input.c

+8 −0
Original line number Diff line number Diff line
@@ -712,6 +712,14 @@ void rxrpc_data_ready(struct sock *udp_sk) 
	skb_orphan(skb);

	sp = rxrpc_skb(skb);



	if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) {

		static int lose;

		if ((lose++ & 7) == 7) {

			rxrpc_lose_skb(skb, rxrpc_skb_rx_lost);

			return;

		}

	}



	_net("Rx UDP packet from %08x:%04hu",

	     ntohl(ip_hdr(skb)->saddr), ntohs(udp_hdr(skb)->source));

net/rxrpc/output.c

+9 −0
Original line number Diff line number Diff line
@@ -225,6 +225,15 @@ int rxrpc_send_data_packet(struct rxrpc_connection *conn, struct sk_buff *skb) 
	msg.msg_controllen = 0;

	msg.msg_flags = 0;



	if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) {

		static int lose;

		if ((lose++ & 7) == 7) {

			rxrpc_lose_skb(skb, rxrpc_skb_tx_lost);

			_leave(" = 0 [lose]");

			return 0;

		}

	}



	/* send the packet with the don't fragment bit set if we currently

	 * think it's small enough */

	if (skb->len - sizeof(struct rxrpc_wire_header) < conn->params.peer->maxdata) {