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authorDavid Howells <dhowells@redhat.com>2018-09-27 15:13:08 +0100
committerDavid Howells <dhowells@redhat.com>2018-09-28 10:32:03 +0100
commitb604dd9883f783a94020d772e4fe03160f455372 (patch)
tree4aea958be93cbd979e2325ac8a2126b836f13f9c /net/rxrpc/local_object.c
parentdc71db34e4f3c06b8277c8f3c2ff014610607a8c (diff)
downloadlinux-stericsson-b604dd9883f783a94020d772e4fe03160f455372.tar.gz
rxrpc: Fix RTT gathering
Fix RTT information gathering in AF_RXRPC by the following means: (1) Enable Rx timestamping on the transport socket with SO_TIMESTAMPNS. (2) If the sk_buff doesn't have a timestamp set when rxrpc_data_ready() collects it, set it at that point. (3) Allow ACKs to be requested on the last packet of a client call, but not a service call. We need to be careful lest we undo: bf7d620abf22c321208a4da4f435e7af52551a21 Author: David Howells <dhowells@redhat.com> Date: Thu Oct 6 08:11:51 2016 +0100 rxrpc: Don't request an ACK on the last DATA packet of a call's Tx phase but that only really applies to service calls that we're handling, since the client side gets to send the final ACK (or not). (4) When about to transmit an ACK or DATA packet, record the Tx timestamp before only; don't update the timestamp afterwards. (5) Switch the ordering between recording the serial and recording the timestamp to always set the serial number first. The serial number shouldn't be seen referenced by an ACK packet until we've transmitted the packet bearing it - so in the Rx path, we don't need the timestamp until we've checked the serial number. Fixes: cf1a6474f807 ("rxrpc: Add per-peer RTT tracker") Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'net/rxrpc/local_object.c')
-rw-r--r--net/rxrpc/local_object.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/net/rxrpc/local_object.c b/net/rxrpc/local_object.c
index 777c3ed4cfc0..81de7d889ffa 100644
--- a/net/rxrpc/local_object.c
+++ b/net/rxrpc/local_object.c
@@ -173,6 +173,15 @@ static int rxrpc_open_socket(struct rxrpc_local *local, struct net *net)
_debug("setsockopt failed");
goto error;
}
+
+ /* We want receive timestamps. */
+ opt = 1;
+ ret = kernel_setsockopt(local->socket, SOL_SOCKET, SO_TIMESTAMPNS,
+ (char *)&opt, sizeof(opt));
+ if (ret < 0) {
+ _debug("setsockopt failed");
+ goto error;
+ }
break;
default: