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authorDavid Howells2016-09-22 01:29:31 +0200
committerDavid Howells2016-09-22 09:21:24 +0200
commit50235c4b5a2fb9a9690f02cd1dea6ca047d7f79e (patch)
tree3dc5a178820b16d5eaef0484fe7751cb4f71375e /net/rxrpc/misc.c
parentrxrpc: Add ktime_sub_ms() (diff)
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rxrpc: Obtain RTT data by requesting ACKs on DATA packets
In addition to sending a PING ACK to gain RTT data, we can set the RXRPC_REQUEST_ACK flag on a DATA packet and get a REQUESTED-ACK ACK. The ACK packet contains the serial number of the packet it is in response to, so we can look through the Tx buffer for a matching DATA packet. This requires that the data packets be stamped with the time of transmission as a ktime rather than having the resend_at time in jiffies. This further requires the resend code to do the resend determination in ktimes and convert to jiffies to set the timer. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'net/rxrpc/misc.c')
-rw-r--r--net/rxrpc/misc.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/net/rxrpc/misc.c b/net/rxrpc/misc.c
index 56e668352fc7..0d425e707f22 100644
--- a/net/rxrpc/misc.c
+++ b/net/rxrpc/misc.c
@@ -68,9 +68,9 @@ unsigned int rxrpc_rx_mtu = 5692;
unsigned int rxrpc_rx_jumbo_max = 4;
/*
- * Time till packet resend (in jiffies).
+ * Time till packet resend (in milliseconds).
*/
-unsigned int rxrpc_resend_timeout = 4 * HZ;
+unsigned int rxrpc_resend_timeout = 4 * 1000;
const char *const rxrpc_pkts[] = {
"?00",
@@ -186,8 +186,10 @@ const char rxrpc_recvmsg_traces[rxrpc_recvmsg__nr_trace][5] = {
const char rxrpc_rtt_tx_traces[rxrpc_rtt_tx__nr_trace][5] = {
[rxrpc_rtt_tx_ping] = "PING",
+ [rxrpc_rtt_tx_data] = "DATA",
};
const char rxrpc_rtt_rx_traces[rxrpc_rtt_rx__nr_trace][5] = {
[rxrpc_rtt_rx_ping_response] = "PONG",
+ [rxrpc_rtt_rx_requested_ack] = "RACK",
};