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SubjectRe: [PATCH net-next 11/11] rxrpc: Add config to inject packet loss
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Hello.

On 9/18/2016 2:22 AM, David Howells wrote:

> 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>

[...]

> diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
> index 84bb16d47b85..7ac1edf3aac7 100644
> --- a/net/rxrpc/input.c
> +++ b/net/rxrpc/input.c
> @@ -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;

IIRC, scripts/checkpatch.pl complains now if there's no empty line after
declaration...

> + 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));
>
> diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c
> index a2cad5ce7416..16e18a94ffa6 100644
> --- a/net/rxrpc/output.c
> +++ b/net/rxrpc/output.c
> @@ -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;

Same here.

> + 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) {

MBR, Sergei

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