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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: David Howells <dhowells@redhat.com>
steinar/wifi_calib_4_9_kernel
David Howells 2016-09-17 10:49:15 +01:00
parent 71f3ca408f
commit 8a681c3605
3 changed files with 24 additions and 0 deletions
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7
net/rxrpc/Kconfig
View File

@ -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"

8
net/rxrpc/input.c
View File

@ -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));

9
net/rxrpc/output.c
View File

@ -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) {