wl12xx: add support for multiple SSIDs in sched_scan

The wl12xx firmwares support multiple SSIDs in a single sched_scan
run.  This patch implements support for it.

We use three different types os sched_scan: FILTER_ANY (ie. not
filtering, only wildcard SSID in the probe_reqs); FILTER_LIST (ie. send out
probe_reqs with the specified SSIDs and only report if they are
found); and FILTER_DISABLED (ie. send out probe_reqs with the
specified SSIDs, but report anything found).

Since we still don't have proper filter support in nl80211/cfg80211
yet, we cannot use filters when the wildcard SSID is used.  Thus, we
will not filter anything if the wildcard SSID is specified.

Signed-off-by: Luciano Coelho <coelho@ti.com>

diff --git a/drivers/net/wireless/wl12xx/main.c b/drivers/net/wireless/wl12xx/main.c
index 0f72af9..bde8402 100644 (file)
--- a/drivers/net/wireless/wl12xx/main.c
+++ b/drivers/net/wireless/wl12xx/main.c
@@ -4491,6 +4491,7 @@ int wl1271_init_ieee80211(struct wl1271 *wl)
        wl->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
                BIT(NL80211_IFTYPE_ADHOC) | BIT(NL80211_IFTYPE_AP);
        wl->hw->wiphy->max_scan_ssids = 1;
+       wl->hw->wiphy->max_sched_scan_ssids = 8;
        /*
         * Maximum length of elements in scanning probe request templates
         * should be the maximum length possible for a template, without

diff --git a/drivers/net/wireless/wl12xx/scan.c b/drivers/net/wireless/wl12xx/scan.c
index 7229eaa..af9d53c 100644 (file)
--- a/drivers/net/wireless/wl12xx/scan.c
+++ b/drivers/net/wireless/wl12xx/scan.c
@@ -473,6 +473,48 @@ wl1271_scan_sched_scan_channels(struct wl1271 *wl,
                cfg->passive[2] || cfg->active[2];
 }
 
+/* Returns 0 if no wildcard is used, 1 if wildcard is used or a
+ * negative value on error */
+static int
+wl12xx_scan_sched_scan_ssid_list(struct wl1271 *wl,
+                                struct cfg80211_sched_scan_request *req)
+{
+       struct wl1271_cmd_sched_scan_ssid_list *cmd = NULL;
+       struct cfg80211_ssid *ssid = req->ssids;
+       int ret, wildcard = 0;
+
+       wl1271_debug(DEBUG_CMD, "cmd sched scan ssid list");
+
+       cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
+       if (!cmd)
+               return -ENOMEM;
+
+       while ((cmd->n_ssids < req->n_ssids) && ssid) {
+               if (ssid->ssid_len == 0)
+                       wildcard = 1;
+               cmd->ssids[cmd->n_ssids].type = SCAN_SSID_TYPE_HIDDEN;
+               cmd->ssids[cmd->n_ssids].len = ssid->ssid_len;
+               memcpy(cmd->ssids[cmd->n_ssids].ssid, ssid->ssid,
+                      ssid->ssid_len);
+               ssid++;
+               cmd->n_ssids++;
+       }
+
+       wl1271_dump(DEBUG_SCAN, "SSID_LIST: ", cmd, sizeof(*cmd));
+
+       ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_SSID_CFG, cmd,
+                             sizeof(*cmd), 0);
+       if (ret < 0) {
+               wl1271_error("cmd sched scan ssid list failed");
+               goto out;
+       }
+
+       ret = wildcard;
+out:
+       kfree(cmd);
+       return ret;
+}
+
 int wl1271_scan_sched_scan_config(struct wl1271 *wl,
                                  struct cfg80211_sched_scan_request *req,
                                  struct ieee80211_sched_scan_ies *ies)
@@ -504,14 +546,21 @@ int wl1271_scan_sched_scan_config(struct wl1271 *wl,
        for (i = 0; i < SCAN_MAX_CYCLE_INTERVALS; i++)
                cfg->intervals[i] = cpu_to_le32(req->interval);
 
-       if (!force_passive && req->ssids[0].ssid_len && req->ssids[0].ssid) {
-               cfg->filter_type = SCAN_SSID_FILTER_SPECIFIC;
-               cfg->ssid_len = req->ssids[0].ssid_len;
-               memcpy(cfg->ssid, req->ssids[0].ssid,
-                      req->ssids[0].ssid_len);
-       } else {
+       cfg->ssid_len = 0;
+       if (req->n_ssids == 0) {
+               wl1271_debug(DEBUG_SCAN, "using SCAN_SSID_FILTER_ANY");
                cfg->filter_type = SCAN_SSID_FILTER_ANY;
-               cfg->ssid_len = 0;
+       } else {
+               ret = wl12xx_scan_sched_scan_ssid_list(wl, req);
+               if (ret < 0)
+                       goto out;
+               if (ret) {
+                       wl1271_debug(DEBUG_SCAN, "using SCAN_SSID_FILTER_DISABLED");
+                       cfg->filter_type = SCAN_SSID_FILTER_DISABLED;
+               } else {
+                       wl1271_debug(DEBUG_SCAN, "using SCAN_SSID_FILTER_LIST");
+                       cfg->filter_type = SCAN_SSID_FILTER_LIST;
+               }
        }
 
        if (!wl1271_scan_sched_scan_channels(wl, req, cfg)) {