Return-path: Received: from mail-fx0-f46.google.com ([209.85.161.46]:64873 "EHLO mail-fx0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932230Ab1C3OgQ (ORCPT ); Wed, 30 Mar 2011 10:36:16 -0400 Received: by fxm17 with SMTP id 17so1097354fxm.19 for ; Wed, 30 Mar 2011 07:36:14 -0700 (PDT) From: Ohad Ben-Cohen To: Cc: Luciano Coelho , Ohad Ben-Cohen Subject: [PATCH] wl12xx: fix roaming Date: Wed, 30 Mar 2011 16:35:59 +0200 Message-Id: <1301495759-22507-1-git-send-email-ohad@wizery.com> Sender: linux-wireless-owner@vger.kernel.org List-ID: The wl12xx device normally drops all frames coming from BSSID it is not joined with. This behavior is configured today by the wl12xx driver in response to a handful of ieee80211_bss_change and ieee80211_conf_changed notification flags, such as BSS_CHANGED_ASSOC, BSS_CHANGED_BSSID, IEEE80211_CONF_CHANGE_IDLE, etc.. This breaks when we roam to a new BSSID, where authentication frames are sent before any BSS_CHANGED/CONF_CHANGED flags are received. When this happens the hardware silently drops the authentication responses, and the roaming fails. Ideally this aggressive filtering behavior of the device should be disabled upon a notification from mac80211. Such notification will take place after multi-channel support will be added: mac80211 will likely send a remain-on-channel notification to drivers when entering sensitive states (like authentication), otherwise the firmware might jump to different channels (to serve a different role). Until those notifications materialize, disable the hw BSSID filter when authentication requests are sent, so roaming would work. Signed-off-by: Ohad Ben-Cohen --- drivers/net/wireless/wl12xx/io.h | 1 + drivers/net/wireless/wl12xx/main.c | 4 ++-- drivers/net/wireless/wl12xx/tx.c | 24 ++++++++++++++++++++++++ 3 files changed, 27 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/wl12xx/io.h b/drivers/net/wireless/wl12xx/io.h index e6199eb..36e1855 100644 --- a/drivers/net/wireless/wl12xx/io.h +++ b/drivers/net/wireless/wl12xx/io.h @@ -171,5 +171,6 @@ int wl1271_free_hw(struct wl1271 *wl); irqreturn_t wl1271_irq(int irq, void *data); bool wl1271_set_block_size(struct wl1271 *wl); int wl1271_tx_dummy_packet(struct wl1271 *wl); +void wl1271_configure_filters(struct wl1271 *wl, unsigned int filters); #endif diff --git a/drivers/net/wireless/wl12xx/main.c b/drivers/net/wireless/wl12xx/main.c index 85cb4da..1ffab7f 100644 --- a/drivers/net/wireless/wl12xx/main.c +++ b/drivers/net/wireless/wl12xx/main.c @@ -1506,7 +1506,7 @@ static void wl1271_op_remove_interface(struct ieee80211_hw *hw, cancel_work_sync(&wl->recovery_work); } -static void wl1271_configure_filters(struct wl1271 *wl, unsigned int filters) +void wl1271_configure_filters(struct wl1271 *wl, unsigned int filters) { wl1271_set_default_filters(wl); @@ -1628,7 +1628,7 @@ static int wl1271_unjoin(struct wl1271 *wl) clear_bit(WL1271_FLAG_JOINED, &wl->flags); memset(wl->bssid, 0, ETH_ALEN); - /* stop filterting packets based on bssid */ + /* stop filtering packets based on bssid */ wl1271_configure_filters(wl, FIF_OTHER_BSS); out: diff --git a/drivers/net/wireless/wl12xx/tx.c b/drivers/net/wireless/wl12xx/tx.c index db9e47e..0ff6520 100644 --- a/drivers/net/wireless/wl12xx/tx.c +++ b/drivers/net/wireless/wl12xx/tx.c @@ -70,6 +70,28 @@ static void wl1271_free_tx_id(struct wl1271 *wl, int id) } } +static int wl1271_tx_update_filters(struct wl1271 *wl, + struct sk_buff *skb) +{ + struct ieee80211_hdr *hdr; + + hdr = (struct ieee80211_hdr *)(skb->data + + sizeof(struct wl1271_tx_hw_descr)); + + /* + * stop bssid-based filtering before transmitting authentication + * requests. this way the hw will never drop authentication + * responses coming from BSSIDs it isn't familiar with (e.g. on + * roaming) + */ + if (!ieee80211_is_auth(hdr->frame_control)) + return 0; + + wl1271_configure_filters(wl, FIF_OTHER_BSS); + + return wl1271_acx_rx_config(wl, wl->rx_config, wl->rx_filter); +} + static void wl1271_tx_ap_update_inconnection_sta(struct wl1271 *wl, struct sk_buff *skb) { @@ -350,6 +372,8 @@ static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct sk_buff *skb, if (wl->bss_type == BSS_TYPE_AP_BSS) { wl1271_tx_ap_update_inconnection_sta(wl, skb); wl1271_tx_regulate_link(wl, hlid); + } else { + wl1271_tx_update_filters(wl, skb); } wl1271_tx_fill_hdr(wl, skb, extra, info, hlid); -- 1.7.1