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wl12xx: fix roaming 

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 <ohad@wizery.com>
Reviewed-by: Luciano Coelho <coelho@ti.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
This commit is contained in:
Ohad Ben-Cohen 2011-03-30 16:35:59 +02:00 committed by Luciano Coelho
parent 13026decf7
commit c5745187a4
3 changed files with 27 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/net/wireless/wl12xx/io.h
View File

@ -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

4
drivers/net/wireless/wl12xx/main.c
View File

@ -1528,7 +1528,7 @@ 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);
@ -1650,7 +1650,7 @@ 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:

24
drivers/net/wireless/wl12xx/tx.c
View File

@ -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);