libertas: fix multicast filtering on eth and msh interfaces

We weren't properly handling multicast on the mesh interface. Fix that,
which involves setting up the hardware to use the union of dev->mc_list
for both eth%d and msh%d devices.

This means we can't do it directly from ->set_multicast_list() because
we'd need to lock the other device to read its list, and we can't do
that because it might deadlock. So punt the actual work to keventd.

Also, invoke the same when taking an interface down; for some reason the
core calls ->set_multicast_list while IFF_UP is still set in dev->flags
when we're taking it down, so its addresses don't get removed then.

We also convert MAC_MULTICAST_ADR to a direct command while we're at it,
removing one more entry from the big switch statement in the deprecated
lbs_prepare_and_send_command() function.
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/libertas/cmd.c

@@ -746,28 +746,6 @@ out:
 	return ret;
 }
 
-static int lbs_cmd_mac_multicast_adr(struct lbs_private *priv,
-				      struct cmd_ds_command *cmd,
-				      u16 cmd_action)
-{
-	struct cmd_ds_mac_multicast_adr *pMCastAdr = &cmd->params.madr;
-
-	lbs_deb_enter(LBS_DEB_CMD);
-	cmd->size = cpu_to_le16(sizeof(struct cmd_ds_mac_multicast_adr) +
-			     S_DS_GEN);
-	cmd->command = cpu_to_le16(CMD_MAC_MULTICAST_ADR);
-
-	lbs_deb_cmd("MULTICAST_ADR: setting %d addresses\n", pMCastAdr->nr_of_adrs);
-	pMCastAdr->action = cpu_to_le16(cmd_action);
-	pMCastAdr->nr_of_adrs =
-	    cpu_to_le16((u16) priv->nr_of_multicastmacaddr);
-	memcpy(pMCastAdr->maclist, priv->multicastlist,
-	       priv->nr_of_multicastmacaddr * ETH_ALEN);
-
-	lbs_deb_leave(LBS_DEB_CMD);
-	return 0;
-}
-
 /**
  *  @brief Get the radio channel
  *
@@ -1247,8 +1225,7 @@ void lbs_set_mac_control(struct lbs_private *priv)
 	cmd.action = cpu_to_le16(priv->mac_control);
 	cmd.reserved = 0;
 
-	lbs_cmd_async(priv, CMD_MAC_CONTROL,
-		&cmd.hdr, sizeof(cmd));
+	lbs_cmd_async(priv, CMD_MAC_CONTROL, &cmd.hdr, sizeof(cmd));
 
 	lbs_deb_leave(LBS_DEB_CMD);
 }
@@ -1360,10 +1337,6 @@ int lbs_prepare_and_send_command(struct lbs_private *priv,
 							 cmdptr, cmd_action);
 		break;
 
-	case CMD_MAC_MULTICAST_ADR:
-		ret = lbs_cmd_mac_multicast_adr(priv, cmdptr, cmd_action);
-		break;
-
 	case CMD_802_11_MONITOR_MODE:
 		ret = lbs_cmd_802_11_monitor_mode(cmdptr,
 				          cmd_action, pdata_buf);

drivers/net/wireless/libertas/cmdresp.c

@@ -316,7 +316,6 @@ static inline int handle_cmd_response(struct lbs_private *priv,
 
 		break;
 
-	case CMD_RET(CMD_MAC_MULTICAST_ADR):
 	case CMD_RET(CMD_802_11_RESET):
 	case CMD_RET(CMD_802_11_AUTHENTICATE):
 	case CMD_RET(CMD_802_11_BEACON_STOP):

drivers/net/wireless/libertas/dev.h

@@ -140,6 +140,8 @@ struct lbs_private {
 	wait_queue_head_t waitq;
 	struct workqueue_struct *work_thread;
 
+	struct work_struct mcast_work;
+
 	/** Scanning */
 	struct delayed_work scan_work;
 	struct delayed_work assoc_work;

drivers/net/wireless/libertas/hostcmd.h

@@ -219,6 +219,7 @@ struct cmd_ds_mac_control {
 };
 
 struct cmd_ds_mac_multicast_adr {
+	struct cmd_header hdr;
 	__le16 action;
 	__le16 nr_of_adrs;
 	u8 maclist[ETH_ALEN * MRVDRV_MAX_MULTICAST_LIST_SIZE];
@@ -703,7 +704,6 @@ struct cmd_ds_command {
 		struct cmd_ds_802_11_rf_antenna rant;
 		struct cmd_ds_802_11_monitor_mode monitor;
 		struct cmd_ds_802_11_rate_adapt_rateset rateset;
-		struct cmd_ds_mac_multicast_adr madr;
 		struct cmd_ds_802_11_ad_hoc_join adj;
 		struct cmd_ds_802_11_rssi rssi;
 		struct cmd_ds_802_11_rssi_rsp rssirsp;

drivers/net/wireless/libertas/main.c

@@ -11,6 +11,7 @@
 #include <linux/if_arp.h>
 #include <linux/kthread.h>
 #include <linux/kfifo.h>
+#include <linux/stddef.h>
 
 #include <net/iw_handler.h>
 #include <net/ieee80211.h>
@@ -446,6 +447,8 @@ static int lbs_mesh_stop(struct net_device *dev)
 
 	spin_unlock_irq(&priv->driver_lock);
 
+	schedule_work(&priv->mcast_work);
+
 	lbs_deb_leave(LBS_DEB_MESH);
 	return 0;
 }
@@ -467,6 +470,8 @@ static int lbs_eth_stop(struct net_device *dev)
 	netif_stop_queue(dev);
 	spin_unlock_irq(&priv->driver_lock);
 
+	schedule_work(&priv->mcast_work);
+
 	lbs_deb_leave(LBS_DEB_NET);
 	return 0;
 }
@@ -563,89 +568,116 @@ done:
 	return ret;
 }
 
-static int lbs_copy_multicast_address(struct lbs_private *priv,
-				     struct net_device *dev)
+
+static inline int mac_in_list(unsigned char *list, int list_len,
+			      unsigned char *mac)
 {
-	int i = 0;
-	struct dev_mc_list *mcptr = dev->mc_list;
+	while (list_len) {
+		if (!memcmp(list, mac, ETH_ALEN))
+			return 1;
+		list += ETH_ALEN;
+		list_len--;
+	}
+	return 0;
+}
+
+
+static int lbs_add_mcast_addrs(struct cmd_ds_mac_multicast_adr *cmd,
+			       struct net_device *dev, int nr_addrs)
+{
+	int i = nr_addrs;
+	struct dev_mc_list *mc_list;
+	DECLARE_MAC_BUF(mac);
+
+	if ((dev->flags & (IFF_UP|IFF_MULTICAST)) != (IFF_UP|IFF_MULTICAST))
+		return nr_addrs;
+
+	netif_tx_lock_bh(dev);
+	for (mc_list = dev->mc_list; mc_list; mc_list = mc_list->next) {
+		if (mac_in_list(cmd->maclist, nr_addrs, mc_list->dmi_addr)) {
+			lbs_deb_net("mcast address %s:%s skipped\n", dev->name,
+				    print_mac(mac, mc_list->dmi_addr));
+			continue;
+		}
 
-	for (i = 0; i < dev->mc_count; i++) {
-		memcpy(&priv->multicastlist[i], mcptr->dmi_addr, ETH_ALEN);
-		mcptr = mcptr->next;
+		if (i == MRVDRV_MAX_MULTICAST_LIST_SIZE)
+			break;
+		memcpy(&cmd->maclist[6*i], mc_list->dmi_addr, ETH_ALEN);
+		lbs_deb_net("mcast address %s:%s added to filter\n", dev->name,
+			    print_mac(mac, mc_list->dmi_addr));
+		i++;
 	}
+	netif_tx_unlock_bh(dev);
+	if (mc_list)
+		return -EOVERFLOW;
+
 	return i;
 }
 
-static void lbs_set_multicast_list(struct net_device *dev)
+static void lbs_set_mcast_worker(struct work_struct *work)
 {
-	struct lbs_private *priv = dev->priv;
-	int old_mac_control;
-	DECLARE_MAC_BUF(mac);
+	struct lbs_private *priv = container_of(work, struct lbs_private, mcast_work);
+	struct cmd_ds_mac_multicast_adr mcast_cmd;
+	int dev_flags;
+	int nr_addrs;
+	int old_mac_control = priv->mac_control;
 
 	lbs_deb_enter(LBS_DEB_NET);
 
-	old_mac_control = priv->mac_control;
+	dev_flags = priv->dev->flags;
+	if (priv->mesh_dev)
+		dev_flags |= priv->mesh_dev->flags;
 
-	if (dev->flags & IFF_PROMISC) {
-		lbs_deb_net("enable promiscuous mode\n");
-		priv->mac_control |=
-		    CMD_ACT_MAC_PROMISCUOUS_ENABLE;
-		priv->mac_control &=
-		    ~(CMD_ACT_MAC_ALL_MULTICAST_ENABLE |
+	if (dev_flags & IFF_PROMISC) {
+		priv->mac_control |= CMD_ACT_MAC_PROMISCUOUS_ENABLE;
+		priv->mac_control &= ~(CMD_ACT_MAC_ALL_MULTICAST_ENABLE |
 				       CMD_ACT_MAC_MULTICAST_ENABLE);
-	} else {
-		/* Multicast */
-		priv->mac_control &=
-		    ~CMD_ACT_MAC_PROMISCUOUS_ENABLE;
-
-		if (dev->flags & IFF_ALLMULTI || dev->mc_count >
-		    MRVDRV_MAX_MULTICAST_LIST_SIZE) {
-			lbs_deb_net( "enabling all multicast\n");
-			priv->mac_control |=
-			    CMD_ACT_MAC_ALL_MULTICAST_ENABLE;
-			priv->mac_control &=
-			    ~CMD_ACT_MAC_MULTICAST_ENABLE;
-		} else {
-			priv->mac_control &=
-			    ~CMD_ACT_MAC_ALL_MULTICAST_ENABLE;
-
-			if (!dev->mc_count) {
-				lbs_deb_net("no multicast addresses, "
-				       "disabling multicast\n");
-				priv->mac_control &=
-				    ~CMD_ACT_MAC_MULTICAST_ENABLE;
-			} else {
-				int i;
+		goto out_set_mac_control;
+	} else if (dev_flags & IFF_ALLMULTI) {
+	do_allmulti:
+		priv->mac_control |= CMD_ACT_MAC_ALL_MULTICAST_ENABLE;
+		priv->mac_control &= ~(CMD_ACT_MAC_PROMISCUOUS_ENABLE |
+				       CMD_ACT_MAC_MULTICAST_ENABLE);
+		goto out_set_mac_control;
+	}
 
-				priv->mac_control |=
-				    CMD_ACT_MAC_MULTICAST_ENABLE;
+	/* Once for priv->dev, again for priv->mesh_dev if it exists */
+	nr_addrs = lbs_add_mcast_addrs(&mcast_cmd, priv->dev, 0);
+	if (nr_addrs >= 0 && priv->mesh_dev)
+		nr_addrs = lbs_add_mcast_addrs(&mcast_cmd, priv->mesh_dev, nr_addrs);
+	if (nr_addrs < 0)
+		goto do_allmulti;
 
-				priv->nr_of_multicastmacaddr =
-				    lbs_copy_multicast_address(priv, dev);
+	if (nr_addrs) {
+		int size = offsetof(struct cmd_ds_mac_multicast_adr,
+				    maclist[6*nr_addrs]);
 
-				lbs_deb_net("multicast addresses: %d\n",
-				       dev->mc_count);
+		mcast_cmd.action = cpu_to_le16(CMD_ACT_SET);
+		mcast_cmd.hdr.size = cpu_to_le16(size);
+		mcast_cmd.nr_of_adrs = cpu_to_le16(nr_addrs);
 
-				for (i = 0; i < dev->mc_count; i++) {
-					lbs_deb_net("Multicast address %d: %s\n",
-					       i, print_mac(mac,
-					       priv->multicastlist[i]));
-				}
-				/* send multicast addresses to firmware */
-				lbs_prepare_and_send_command(priv,
-						      CMD_MAC_MULTICAST_ADR,
-						      CMD_ACT_SET, 0, 0,
-						      NULL);
-			}
-		}
-	}
+		lbs_cmd_async(priv, CMD_MAC_MULTICAST_ADR, &mcast_cmd.hdr, size);
 
+		priv->mac_control |= CMD_ACT_MAC_MULTICAST_ENABLE;
+	} else
+		priv->mac_control &= ~CMD_ACT_MAC_MULTICAST_ENABLE;
+
+	priv->mac_control &= ~(CMD_ACT_MAC_PROMISCUOUS_ENABLE |
+			       CMD_ACT_MAC_ALL_MULTICAST_ENABLE);
+ out_set_mac_control:
 	if (priv->mac_control != old_mac_control)
 		lbs_set_mac_control(priv);
 
 	lbs_deb_leave(LBS_DEB_NET);
 }
 
+static void lbs_set_multicast_list(struct net_device *dev)
+{
+	struct lbs_private *priv = dev->priv;
+
+	schedule_work(&priv->mcast_work);
+}
+
 /**
  *  @brief This function handles the major jobs in the LBS driver.
  *  It handles all events generated by firmware, RX data received
@@ -1122,6 +1154,7 @@ struct lbs_private *lbs_add_card(void *card, struct device *dmdev)
 	priv->work_thread = create_singlethread_workqueue("lbs_worker");
 	INIT_DELAYED_WORK(&priv->assoc_work, lbs_association_worker);
 	INIT_DELAYED_WORK(&priv->scan_work, lbs_scan_worker);
+	INIT_WORK(&priv->mcast_work, lbs_set_mcast_worker);
 	INIT_WORK(&priv->sync_channel, lbs_sync_channel_worker);
 
 	sprintf(priv->mesh_ssid, "mesh");
@@ -1158,6 +1191,7 @@ void lbs_remove_card(struct lbs_private *priv)
 
 	cancel_delayed_work_sync(&priv->scan_work);
 	cancel_delayed_work_sync(&priv->assoc_work);
+	cancel_work_sync(&priv->mcast_work);
 	destroy_workqueue(priv->work_thread);
 
 	if (priv->psmode == LBS802_11POWERMODEMAX_PSP) {
@@ -1322,6 +1356,8 @@ static int lbs_add_mesh(struct lbs_private *priv)
 #ifdef	WIRELESS_EXT
 	mesh_dev->wireless_handlers = (struct iw_handler_def *)&mesh_handler_def;
 #endif
+	mesh_dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
+	mesh_dev->set_multicast_list = lbs_set_multicast_list;
 	/* Register virtual mesh interface */
 	ret = register_netdev(mesh_dev);
 	if (ret) {
@@ -1554,7 +1590,6 @@ static int lbs_add_rtap(struct lbs_private *priv)
 	rtap_dev->stop = lbs_rtap_stop;
 	rtap_dev->get_stats = lbs_rtap_get_stats;
 	rtap_dev->hard_start_xmit = lbs_rtap_hard_start_xmit;
-	rtap_dev->set_multicast_list = lbs_set_multicast_list;
 	rtap_dev->priv = priv;
 
 	ret = register_netdev(rtap_dev);