wl1271: add support for HW TX fragmentation

Indicate to mac80211 we support HW fragmentation.
Support updates of the fragmentation threshold via the
set_frag_threshold callback.
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>

drivers/net/wireless/wl12xx/acx.c

@@ -862,7 +862,7 @@ int wl1271_acx_tid_cfg(struct wl1271 *wl, u8 queue_id, u8 channel_type,
 	return ret;
 }
 
-int wl1271_acx_frag_threshold(struct wl1271 *wl)
+int wl1271_acx_frag_threshold(struct wl1271 *wl, u16 frag_threshold)
 {
 	struct acx_frag_threshold *acx;
 	int ret = 0;
@@ -876,7 +876,7 @@ int wl1271_acx_frag_threshold(struct wl1271 *wl)
 		goto out;
 	}
 
-	acx->frag_threshold = cpu_to_le16(wl->conf.tx.frag_threshold);
+	acx->frag_threshold = cpu_to_le16(frag_threshold);
 	ret = wl1271_cmd_configure(wl, ACX_FRAG_CFG, acx, sizeof(*acx));
 	if (ret < 0) {
 		wl1271_warning("Setting of frag threshold failed: %d", ret);

drivers/net/wireless/wl12xx/acx.h

@@ -1161,7 +1161,7 @@ int wl1271_acx_ac_cfg(struct wl1271 *wl, u8 ac, u8 cw_min, u16 cw_max,
 int wl1271_acx_tid_cfg(struct wl1271 *wl, u8 queue_id, u8 channel_type,
 		       u8 tsid, u8 ps_scheme, u8 ack_policy,
 		       u32 apsd_conf0, u32 apsd_conf1);
-int wl1271_acx_frag_threshold(struct wl1271 *wl);
+int wl1271_acx_frag_threshold(struct wl1271 *wl, u16 frag_threshold);
 int wl1271_acx_tx_config_options(struct wl1271 *wl);
 int wl1271_acx_mem_cfg(struct wl1271 *wl);
 int wl1271_acx_init_mem_config(struct wl1271 *wl);

drivers/net/wireless/wl12xx/init.c

@@ -290,7 +290,7 @@ int wl1271_hw_init(struct wl1271 *wl)
 		goto out_free_memmap;
 
 	/* Default fragmentation threshold */
-	ret = wl1271_acx_frag_threshold(wl);
+	ret = wl1271_acx_frag_threshold(wl, wl->conf.tx.frag_threshold);
 	if (ret < 0)
 		goto out_free_memmap;
 

drivers/net/wireless/wl12xx/main.c

@@ -425,7 +425,7 @@ static int wl1271_plt_init(struct wl1271 *wl)
 		goto out_free_memmap;
 
 	/* Default fragmentation threshold */
-	ret = wl1271_acx_frag_threshold(wl);
+	ret = wl1271_acx_frag_threshold(wl, wl->conf.tx.frag_threshold);
 	if (ret < 0)
 		goto out_free_memmap;
 
@@ -1745,6 +1745,34 @@ static int wl1271_op_hw_scan(struct ieee80211_hw *hw,
 	return ret;
 }
 
+static int wl1271_op_set_frag_threshold(struct ieee80211_hw *hw, u32 value)
+{
+	struct wl1271 *wl = hw->priv;
+	int ret = 0;
+
+	mutex_lock(&wl->mutex);
+
+	if (unlikely(wl->state == WL1271_STATE_OFF)) {
+		ret = -EAGAIN;
+		goto out;
+	}
+
+	ret = wl1271_ps_elp_wakeup(wl, false);
+	if (ret < 0)
+		goto out;
+
+	ret = wl1271_acx_frag_threshold(wl, (u16)value);
+	if (ret < 0)
+		wl1271_warning("wl1271_op_set_frag_threshold failed: %d", ret);
+
+	wl1271_ps_elp_sleep(wl);
+
+out:
+	mutex_unlock(&wl->mutex);
+
+	return ret;
+}
+
 static int wl1271_op_set_rts_threshold(struct ieee80211_hw *hw, u32 value)
 {
 	struct wl1271 *wl = hw->priv;
@@ -2421,6 +2449,7 @@ static const struct ieee80211_ops wl1271_ops = {
 	.set_key = wl1271_op_set_key,
 	.hw_scan = wl1271_op_hw_scan,
 	.bss_info_changed = wl1271_op_bss_info_changed,
+	.set_frag_threshold = wl1271_op_set_frag_threshold,
 	.set_rts_threshold = wl1271_op_set_rts_threshold,
 	.conf_tx = wl1271_op_conf_tx,
 	.get_tsf = wl1271_op_get_tsf,