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brcmsmac: add support for probe response template

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The ucode is able to answer probe response by itself. This writes such
a template into the specific memory. Currently the probe requests are
also send to mac80211 so there are more answers send to a requesting
client. We have to make the ucode stop sending probe requests to the
driver.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Hauke Mehrtens 2013-03-24 01:46:00 +01:00 committed by John W. Linville
parent c031df31da
commit 5f1e59e59f
4 changed files with 42 additions and 84 deletions
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11
drivers/net/wireless/brcm80211/brcmsmac/mac80211_if.c
View File

@ -539,6 +539,15 @@ brcms_ops_bss_info_changed(struct ieee80211_hw *hw,
spin_unlock_bh(&wl->lock);
}
if (changed & BSS_CHANGED_AP_PROBE_RESP) {
struct sk_buff *probe_resp;
spin_lock_bh(&wl->lock);
probe_resp = ieee80211_proberesp_get(hw, vif);
brcms_c_set_new_probe_resp(wl->wlc, probe_resp);
spin_unlock_bh(&wl->lock);
}
if (changed & BSS_CHANGED_BEACON_ENABLED) {
/* Beaconing should be enabled/disabled (beaconing modes) */
brcms_err(core, "%s: Beacon enabled: %s\n", __func__,
@ -1038,6 +1047,8 @@ static int ieee_hw_init(struct ieee80211_hw *hw)
hw->channel_change_time = 7 * 1000;
hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
hw->wiphy->flags |= WIPHY_FLAG_AP_PROBE_RESP_OFFLOAD;
hw->rate_control_algorithm = "minstrel_ht";
hw->sta_data_size = 0;

112
drivers/net/wireless/brcm80211/brcmsmac/main.c
View File

@ -451,6 +451,8 @@ static void brcms_c_detach_mfree(struct brcms_c_info *wlc)
kfree(wlc->hw);
if (wlc->beacon)
dev_kfree_skb_any(wlc->beacon);
if (wlc->probe_resp)
dev_kfree_skb_any(wlc->probe_resp);
/* free the wlc */
kfree(wlc);
@ -7323,69 +7325,6 @@ brcms_c_mod_prb_rsp_rate_table(struct brcms_c_info *wlc, uint frame_len)
}
}
/* Max buffering needed for beacon template/prb resp template is 142 bytes.
*
* PLCP header is 6 bytes.
* 802.11 A3 header is 24 bytes.
* Max beacon frame body template length is 112 bytes.
* Max probe resp frame body template length is 110 bytes.
*
* *len on input contains the max length of the packet available.
*
* The *len value is set to the number of bytes in buf used, and starts
* with the PLCP and included up to, but not including, the 4 byte FCS.
*/
static void
brcms_c_bcn_prb_template(struct brcms_c_info *wlc, u16 type,
u32 bcn_rspec,
struct brcms_bss_cfg *cfg, u16 *buf, int *len)
{
static const u8 ether_bcast[ETH_ALEN] = {255, 255, 255, 255, 255, 255};
struct cck_phy_hdr *plcp;
struct ieee80211_mgmt *h;
int hdr_len, body_len;
hdr_len = D11_PHY_HDR_LEN + DOT11_MAC_HDR_LEN;
/* calc buffer size provided for frame body */
body_len = *len - hdr_len;
/* return actual size */
*len = hdr_len + body_len;
/* format PHY and MAC headers */
memset(buf, 0, hdr_len);
plcp = (struct cck_phy_hdr *) buf;
/*
* PLCP for Probe Response frames are filled in from
* core's rate table
*/
if (type == IEEE80211_STYPE_BEACON)
/* fill in PLCP */
brcms_c_compute_plcp(wlc, bcn_rspec,
(DOT11_MAC_HDR_LEN + body_len + FCS_LEN),
(u8 *) plcp);
/* "Regular" and 16 MBSS but not for 4 MBSS */
/* Update the phytxctl for the beacon based on the rspec */
brcms_c_beacon_phytxctl_txant_upd(wlc, bcn_rspec);
h = (struct ieee80211_mgmt *)&plcp[1];
/* fill in 802.11 header */
h->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | type);
/* DUR is 0 for multicast bcn, or filled in by MAC for prb resp */
/* A1 filled in by MAC for prb resp, broadcast for bcn */
if (type == IEEE80211_STYPE_BEACON)
memcpy(&h->da, &ether_bcast, ETH_ALEN);
memcpy(&h->sa, &wlc->pub->cur_etheraddr, ETH_ALEN);
memcpy(&h->bssid, &cfg->BSSID, ETH_ALEN);
/* SEQ filled in by MAC */
}
int brcms_c_get_header_len(void)
{
return TXOFF;
@ -7527,6 +7466,20 @@ void brcms_c_set_new_beacon(struct brcms_c_info *wlc, struct sk_buff *beacon,
brcms_c_update_beacon(wlc);
}
void brcms_c_set_new_probe_resp(struct brcms_c_info *wlc,
struct sk_buff *probe_resp)
{
if (!probe_resp)
return;
if (wlc->probe_resp)
dev_kfree_skb_any(wlc->probe_resp);
wlc->probe_resp = probe_resp;
/* add PLCP */
skb_push(wlc->probe_resp, D11_PHY_HDR_LEN);
brcms_c_update_probe_resp(wlc, false);
}
/* Write ssid into shared memory */
static void
brcms_c_shm_ssid_upd(struct brcms_c_info *wlc, struct brcms_bss_cfg *cfg)
@ -7546,30 +7499,19 @@ brcms_c_shm_ssid_upd(struct brcms_c_info *wlc, struct brcms_bss_cfg *cfg)
static void
brcms_c_bss_update_probe_resp(struct brcms_c_info *wlc,
struct brcms_bss_cfg *cfg,
struct sk_buff *probe_resp,
bool suspend)
{
u16 *prb_resp;
int len = BCN_TMPL_LEN;
int len;
prb_resp = kmalloc(BCN_TMPL_LEN, GFP_ATOMIC);
if (!prb_resp)
return;
/*
* write the probe response to hardware, or save in
* the config structure
*/
/* create the probe response template */
brcms_c_bcn_prb_template(wlc, IEEE80211_STYPE_PROBE_RESP, 0,
cfg, prb_resp, &len);
len = min_t(size_t, probe_resp->len, BCN_TMPL_LEN);
if (suspend)
brcms_c_suspend_mac_and_wait(wlc);
/* write the probe response into the template region */
brcms_b_write_template_ram(wlc->hw, T_PRS_TPL_BASE,
(len + 3) & ~3, prb_resp);
(len + 3) & ~3, probe_resp->data);
/* write the length of the probe response frame (+PLCP/-FCS) */
brcms_b_write_shm(wlc->hw, M_PRB_RESP_FRM_LEN, (u16) len);
@ -7583,13 +7525,11 @@ brcms_c_bss_update_probe_resp(struct brcms_c_info *wlc,
* PLCP header for the call to brcms_c_mod_prb_rsp_rate_table()
* by subtracting the PLCP len and adding the FCS.
*/
len += (-D11_PHY_HDR_LEN + FCS_LEN);
brcms_c_mod_prb_rsp_rate_table(wlc, (u16) len);
brcms_c_mod_prb_rsp_rate_table(wlc,
(u16)len + FCS_LEN - D11_PHY_HDR_LEN);
if (suspend)
brcms_c_enable_mac(wlc);
kfree(prb_resp);
}
void brcms_c_update_probe_resp(struct brcms_c_info *wlc, bool suspend)
@ -7598,8 +7538,12 @@ void brcms_c_update_probe_resp(struct brcms_c_info *wlc, bool suspend)
/* update AP or IBSS probe responses */
if (wlc->pub->up && (bsscfg->type == BRCMS_TYPE_AP ||
bsscfg->type == BRCMS_TYPE_ADHOC))
brcms_c_bss_update_probe_resp(wlc, bsscfg, suspend);
bsscfg->type == BRCMS_TYPE_ADHOC)) {
if (!wlc->probe_resp)
return;
brcms_c_bss_update_probe_resp(wlc, bsscfg, wlc->probe_resp,
suspend);
}
}
int brcms_b_xmtfifo_sz_get(struct brcms_hardware *wlc_hw, uint fifo,

1
drivers/net/wireless/brcm80211/brcmsmac/main.h
View File

@ -567,6 +567,7 @@ struct brcms_c_info {
struct sk_buff *beacon;
u16 beacon_tim_offset;
u16 beacon_dtim_period;
struct sk_buff *probe_resp;
};
/* antsel module specific state */

2
drivers/net/wireless/brcm80211/brcmsmac/pub.h
View File

@ -336,6 +336,8 @@ extern void brcms_c_update_beacon(struct brcms_c_info *wlc);
extern void brcms_c_set_new_beacon(struct brcms_c_info *wlc,
struct sk_buff *beacon, u16 tim_offset,
u16 dtim_period);
extern void brcms_c_set_new_probe_resp(struct brcms_c_info *wlc,
struct sk_buff *probe_resp);
extern void brcms_c_set_ssid(struct brcms_c_info *wlc, u8 *ssid,
size_t ssid_len);