Increase the amount of RX buffers given to the bwfm(4) chip. We haave seen

this already on previous chips, which only started giving us packets when
handing over at least 128 of them.  Apparently some now require 256, which
seems to get the Apple M1's WiFi going.

diff --git a/sys/dev/pci/if_bwfm_pci.c b/sys/dev/pci/if_bwfm_pci.c
index 258e0d1..27d53b3 100644 (file)
--- a/sys/dev/pci/if_bwfm_pci.c
+++ b/sys/dev/pci/if_bwfm_pci.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: if_bwfm_pci.c,v 1.47 2021/02/26 00:19:41 patrick Exp $        */
+/*     $OpenBSD: if_bwfm_pci.c,v 1.48 2021/02/26 11:22:10 patrick Exp $        */
 /*
  * Copyright (c) 2010-2016 Broadcom Corporation
  * Copyright (c) 2017 Patrick Wildt <patrick@blueri.se>
@@ -676,10 +676,10 @@ bwfm_pci_preinit(struct bwfm_softc *bwfm)
        /*
         * For whatever reason, could also be a bug somewhere in this
         * driver, the firmware needs a bunch of RX buffers otherwise
-        * it won't send any RX complete messages.  64 buffers don't
-        * suffice, but 128 buffers are enough.
+        * it won't send any RX complete messages.
         */
-       if_rxr_init(&sc->sc_rxbuf_ring, 128, sc->sc_max_rxbufpost);
+       if_rxr_init(&sc->sc_rxbuf_ring, min(256, sc->sc_max_rxbufpost),
+           sc->sc_max_rxbufpost);
        if_rxr_init(&sc->sc_ioctl_ring, 8, 8);
        if_rxr_init(&sc->sc_event_ring, 8, 8);
        bwfm_pci_fill_rx_rings(sc);