If A-MPDU transmission fails entirely, then no BA is received from the

NIC and pushed up to the driver.  Unfortunately this means there's
no rate control notification done.  Thus, if the rate control code
makes a decision that hits a crappy rate that can't succeed, the
rate code would never lower the rate and packet loss would continue.

So, fake some rate control notification in this case.

1 files changed, 15 insertions, 3 deletions

diff --git a/sys/dev/iwn/if_iwn.c b/sys/dev/iwn/if_iwn.c
index d2f2677..add9a26 100644
--- a/sys/dev/iwn/if_iwn.c
+++ b/sys/dev/iwn/if_iwn.c
@@ -2987,12 +2987,24 @@ iwn_ampdu_tx_done(struct iwn_softc *sc, int qid, int idx, int nframes,
 
 	DPRINTF(sc, IWN_DEBUG_TRACE, "->%s begin\n", __func__);
 
-#ifdef NOT_YET
 	if (nframes == 1) {
-		if ((*status & 0xff) != 1 && (*status & 0xff) != 2)
+		if ((*status & 0xff) != 1 && (*status & 0xff) != 2) {
+#ifdef	NOT_YET
 			printf("ieee80211_send_bar()\n");
-	}
 #endif
+			/*
+			 * If we completely fail a transmit, make sure a
+			 * notification is pushed up to the rate control
+			 * layer.
+			 */
+			tap = sc->qid2tap[qid];
+			tid = tap->txa_tid;
+			wn = (void *)tap->txa_ni;
+			ni = tap->txa_ni;
+			ieee80211_ratectl_tx_complete(ni->ni_vap, ni,
+			    IEEE80211_RATECTL_TX_FAILURE, &nframes, NULL);
+		}
+	}
 
 	bitmap = 0;
 	start = idx;