brcmsmac: add support for probe response template
Hauke Mehrtens [Sun, 24 Mar 2013 00:46:00 +0000 (01:46 +0100)]
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>

drivers/net/wireless/brcm80211/brcmsmac/mac80211_if.c
drivers/net/wireless/brcm80211/brcmsmac/main.c
drivers/net/wireless/brcm80211/brcmsmac/main.h
drivers/net/wireless/brcm80211/brcmsmac/pub.h

index 5688df5..3c9921c 100644 (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;
index cf11d89..04192ed 100644 (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,
index 82382da..b5d7a38 100644 (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 */
index 6ed0a20..5e6db62 100644 (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);