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authorDavid Howells <dhowells@redhat.com>2018-10-08 15:46:11 +0100
committerDavid Howells <dhowells@redhat.com>2018-10-08 22:42:04 +0100
commit298bc15b2079c324e82d0a6fda39c3d762af7282 (patch)
tree4c40d298df2ee83702d152bf8b163c60769c3e99 /net/rxrpc
parentdfe995224693798e554ab4770f6d8a096afc60cd (diff)
downloadlinux-stericsson-298bc15b2079c324e82d0a6fda39c3d762af7282.tar.gz
rxrpc: Only take the rwind and mtu values from latest ACK
Move the out-of-order and duplicate ACK packet check to before the call to rxrpc_input_ackinfo() so that the receive window size and MTU size are only checked in the latest ACK packet and don't regress. Fixes: 248f219cb8bc ("rxrpc: Rewrite the data and ack handling code") Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'net/rxrpc')
-rw-r--r--net/rxrpc/input.c19
1 files changed, 10 insertions, 9 deletions
diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
index af8ce64f4162..04213a65c1ac 100644
--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -868,6 +868,16 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb,
rxrpc_propose_ack_respond_to_ack);
}
+ /* Discard any out-of-order or duplicate ACKs. */
+ if (before_eq(sp->hdr.serial, call->acks_latest)) {
+ _debug("discard ACK %d <= %d",
+ sp->hdr.serial, call->acks_latest);
+ return;
+ }
+ call->acks_latest_ts = skb->tstamp;
+ call->acks_latest = sp->hdr.serial;
+
+ /* Parse rwind and mtu sizes if provided. */
ioffset = offset + nr_acks + 3;
if (skb->len >= ioffset + sizeof(buf.info)) {
if (skb_copy_bits(skb, ioffset, &buf.info, sizeof(buf.info)) < 0)
@@ -889,15 +899,6 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb,
return;
}
- /* Discard any out-of-order or duplicate ACKs. */
- if (before_eq(sp->hdr.serial, call->acks_latest)) {
- _debug("discard ACK %d <= %d",
- sp->hdr.serial, call->acks_latest);
- return;
- }
- call->acks_latest_ts = skb->tstamp;
- call->acks_latest = sp->hdr.serial;
-
if (before(hard_ack, call->tx_hard_ack) ||
after(hard_ack, call->tx_top))
return rxrpc_proto_abort("AKW", call, 0);