fix iwx(4) monitor mode

Monitor mode was broken by a recent firmware update. Two tweaks make
it work again:

1) The firmware does not like us sending the power-mode command while
in monitor mode and will panic, so simply don't do that.

2) We no longer add two queues while in monitor mode, just one queue
for frame injection. This queue's index will be 1, not 2. Make the
driver expect the correct index to prevent an error when monitor mode
is entered.

tested by jmc@ and myself on iwx ax200

diff --git a/sys/dev/pci/if_iwx.c b/sys/dev/pci/if_iwx.c
index 3a4810b..15eea66 100644 (file)
--- a/sys/dev/pci/if_iwx.c
+++ b/sys/dev/pci/if_iwx.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: if_iwx.c,v 1.183 2024/04/13 23:44:11 jsg Exp $        */
+/*     $OpenBSD: if_iwx.c,v 1.184 2024/05/08 14:03:54 stsp Exp $       */
 
 /*
  * Copyright (c) 2014, 2016 genua gmbh <info@genua.de>
@@ -8323,6 +8323,9 @@ iwx_run(struct iwx_softc *sc)
                return err;
        }
 #endif
+       if (ic->ic_opmode == IEEE80211_M_MONITOR)
+               return 0;
+
        err = iwx_power_mac_update_mode(sc, in);
        if (err) {
                printf("%s: could not update MAC power (error %d)\n",
@@ -8330,9 +8333,6 @@ iwx_run(struct iwx_softc *sc)
                return err;
        }
 
-       if (ic->ic_opmode == IEEE80211_M_MONITOR)
-               return 0;
-
        /* Start at lowest available bit-rate. Firmware will raise. */
        in->in_ni.ni_txrate = 0;
        in->in_ni.ni_txmcs = 0;

diff --git a/sys/dev/pci/if_iwxreg.h b/sys/dev/pci/if_iwxreg.h
index 8713b11..e184c0a 100644 (file)
--- a/sys/dev/pci/if_iwxreg.h
+++ b/sys/dev/pci/if_iwxreg.h
@@ -1,4 +1,4 @@
-/*     $OpenBSD: if_iwxreg.h,v 1.52 2023/10/06 15:15:41 stsp Exp $     */
+/*     $OpenBSD: if_iwxreg.h,v 1.53 2024/05/08 14:03:54 stsp Exp $     */
 
 /*-
  * Based on BSD-licensed source modules in the Linux iwlwifi driver,
@@ -1760,7 +1760,7 @@ struct iwx_gen3_bc_tbl_entry {
 #define IWX_DQA_CMD_QUEUE              0
 #define IWX_DQA_AUX_QUEUE              1
 
-#define IWX_DQA_INJECT_MONITOR_QUEUE   2 /* used in monitor mode only */
+#define IWX_DQA_INJECT_MONITOR_QUEUE   1 /* used in monitor mode only */
 #define IWX_DQA_MGMT_QUEUE             1 /* default queue other modes */
 
 /* Reserve 8 DQA Tx queues for QoS data frames. */