ipcpd: Use capacity queue estimation for mb-ecn

The mb-ecn algorithm was using rbuff queue depths in packets to mark,
but sockets in the poa component report capacity in bytes. The tx
rings are now adaptive to block on queuing delay instead of when full
to prevent buffer bloat, controllable via fccntl (FLOWSTXQDLY and
FLOWGTXQDLY).

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/ipcpd/unicast/ca/ops.h b/src/ipcpd/unicast/ca/ops.h
index b01e8573..835fe0c5 100644
--- a/src/ipcpd/unicast/ca/ops.h
+++ b/src/ipcpd/unicast/ca/ops.h
@@ -33,6 +33,7 @@ struct ca_ops {
         time_t   (* ctx_update_snd)(void *     ctx,
                                     size_t     len,
                                     uint8_t    lecn,
+                                    size_t     flows,
                                     uint64_t * ftag);
 
         bool     (* ctx_update_rcv)(void *     ctx,
@@ -54,10 +55,11 @@ struct ca_ops {
                              uint64_t now,
                              uint64_t rtt);
 
+        /* queued and mean are bytes; their ratio is packets. */
         int      (* calc_ecn)(size_t    queued,
                               uint8_t * ecn,
                               qoscube_t qc,
-                              size_t    len);
+                              size_t    mean);
 
         /* True if calc_ecn inspects the queue; gates the lookup. */
         bool        marks_ecn;