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>

1 files changed, 3 insertions, 0 deletions

diff --git a/packages/CVS/Entries.Extra b/packages/CVS/Entries.Extra
new file mode 100644
index 0000000..2e3a7b7
--- /dev/null
+++ b/packages/CVS/Entries.Extra
@@ -0,0 +1,3 @@
+/cscope.spec////
+D/MSDOS////
+D/uw7////