[PATCH net-next v3 5/7] net: rpmsg-eth: Add support for multicast filtering

[MD Danish Anwar <danishanwar@ti.com>]

Add support for multicast filtering for RPMSG ETH driver. Implement the
ndo_set_rx_mode callback as icve_set_rx_mode() API. rx_mode_workqueue is
initialized in rpmsg_eth_probe() and queued in rpmsg_eth_set_rx_mode().

Signed-off-by: MD Danish Anwar <danishanwar@ti.com>
---
 drivers/net/ethernet/rpmsg_eth.c | 63 ++++++++++++++++++++++++++++++++
 drivers/net/ethernet/rpmsg_eth.h | 12 ++++++
 2 files changed, 75 insertions(+)

diff --git a/drivers/net/ethernet/rpmsg_eth.c b/drivers/net/ethernet/rpmsg_eth.c
index 211d1499f3d7..d491e28ce421 100644
--- a/drivers/net/ethernet/rpmsg_eth.c
+++ b/drivers/net/ethernet/rpmsg_eth.c
@@ -68,6 +68,11 @@ static int create_request(struct rpmsg_eth_common *common,
 		ether_addr_copy(msg->req_msg.mac_addr.addr,
 				common->port->ndev->dev_addr);
 		break;
+	case RPMSG_ETH_REQ_ADD_MC_ADDR:
+	case RPMSG_ETH_REQ_DEL_MC_ADDR:
+		ether_addr_copy(msg->req_msg.mac_addr.addr,
+				common->mcast_addr);
+		break;
 	case RPMSG_ETH_NOTIFY_PORT_UP:
 	case RPMSG_ETH_NOTIFY_PORT_DOWN:
 		msg->msg_hdr.msg_type = RPMSG_ETH_NOTIFY_MSG;
@@ -119,6 +124,22 @@ static int rpmsg_eth_create_send_request(struct rpmsg_eth_common *common,
 	return ret;
 }
 
+static int rpmsg_eth_add_mc_addr(struct net_device *ndev, const u8 *addr)
+{
+	struct rpmsg_eth_common *common = rpmsg_eth_ndev_to_common(ndev);
+
+	ether_addr_copy(common->mcast_addr, addr);
+	return rpmsg_eth_create_send_request(common, RPMSG_ETH_REQ_ADD_MC_ADDR, true);
+}
+
+static int rpmsg_eth_del_mc_addr(struct net_device *ndev, const u8 *addr)
+{
+	struct rpmsg_eth_common *common = rpmsg_eth_ndev_to_common(ndev);
+
+	ether_addr_copy(common->mcast_addr, addr);
+	return rpmsg_eth_create_send_request(common, RPMSG_ETH_REQ_DEL_MC_ADDR, true);
+}
+
 static void rpmsg_eth_state_machine(struct work_struct *work)
 {
 	struct delayed_work *dwork = to_delayed_work(work);
@@ -201,6 +222,10 @@ static int rpmsg_eth_rpmsg_cb(struct rpmsg_device *rpdev, void *data, int len,
 			break;
 		case RPMSG_ETH_RESP_SET_MAC_ADDR:
 			break;
+		case RPMSG_ETH_RESP_ADD_MC_ADDR:
+		case RPMSG_ETH_RESP_DEL_MC_ADDR:
+			complete(&common->sync_msg);
+			break;
 		}
 		break;
 	case RPMSG_ETH_NOTIFY_MSG:
@@ -393,10 +418,15 @@ static int rpmsg_eth_ndo_stop(struct net_device *ndev)
 
 	netif_carrier_off(port->ndev);
 
+	__dev_mc_unsync(ndev, rpmsg_eth_del_mc_addr);
+	__hw_addr_init(&common->mc_list);
+
 	cancel_delayed_work_sync(&common->state_work);
 	timer_delete_sync(&port->rx_timer);
 	napi_disable(&port->rx_napi);
 
+	cancel_work_sync(&common->rx_mode_work);
+
 	return 0;
 }
 
@@ -453,10 +483,35 @@ static int rpmsg_eth_set_mac_address(struct net_device *ndev, void *addr)
 	return ret;
 }
 
+static void rpmsg_eth_ndo_set_rx_mode_work(struct work_struct *work)
+{
+	struct rpmsg_eth_common *common;
+	struct net_device *ndev;
+
+	common = container_of(work, struct rpmsg_eth_common, rx_mode_work);
+	ndev = common->port->ndev;
+
+	/* make a mc list copy */
+	netif_addr_lock_bh(ndev);
+	__hw_addr_sync(&common->mc_list, &ndev->mc, ndev->addr_len);
+	netif_addr_unlock_bh(ndev);
+
+	__hw_addr_sync_dev(&common->mc_list, ndev, rpmsg_eth_add_mc_addr,
+			   rpmsg_eth_del_mc_addr);
+}
+
+static void rpmsg_eth_set_rx_mode(struct net_device *ndev)
+{
+	struct rpmsg_eth_common *common = rpmsg_eth_ndev_to_common(ndev);
+
+	queue_work(common->cmd_wq, &common->rx_mode_work);
+}
+
 static const struct net_device_ops rpmsg_eth_netdev_ops = {
 	.ndo_open = rpmsg_eth_ndo_open,
 	.ndo_stop = rpmsg_eth_ndo_stop,
 	.ndo_start_xmit = rpmsg_eth_start_xmit,
+	.ndo_set_rx_mode = rpmsg_eth_set_rx_mode,
 	.ndo_set_mac_address = rpmsg_eth_set_mac_address,
 };
 
@@ -533,6 +588,13 @@ static int rpmsg_eth_probe(struct rpmsg_device *rpdev)
 	INIT_DELAYED_WORK(&common->state_work, rpmsg_eth_state_machine);
 	init_completion(&common->sync_msg);
 
+	__hw_addr_init(&common->mc_list);
+	INIT_WORK(&common->rx_mode_work, rpmsg_eth_ndo_set_rx_mode_work);
+	common->cmd_wq = create_singlethread_workqueue("rpmsg_eth_rx_work");
+	if (!common->cmd_wq) {
+		dev_err(dev, "Failure requesting workqueue\n");
+		return -ENOMEM;
+	}
 	/* Register the network device */
 	ret = rpmsg_eth_init_ndev(common);
 	if (ret)
@@ -548,6 +610,7 @@ static void rpmsg_eth_remove(struct rpmsg_device *rpdev)
 
 	netif_napi_del(&port->rx_napi);
 	timer_delete_sync(&port->rx_timer);
+	destroy_workqueue(common->cmd_wq);
 
 	dev_dbg(&rpdev->dev, "rpmsg-eth client driver is removed\n");
 }
diff --git a/drivers/net/ethernet/rpmsg_eth.h b/drivers/net/ethernet/rpmsg_eth.h
index b741407b216b..09fc6528daa5 100644
--- a/drivers/net/ethernet/rpmsg_eth.h
+++ b/drivers/net/ethernet/rpmsg_eth.h
@@ -57,10 +57,14 @@ enum rpmsg_eth_rpmsg_type {
 	/* Request types */
 	RPMSG_ETH_REQ_SHM_INFO = 0,
 	RPMSG_ETH_REQ_SET_MAC_ADDR,
+	RPMSG_ETH_REQ_ADD_MC_ADDR,
+	RPMSG_ETH_REQ_DEL_MC_ADDR,
 
 	/* Response types */
 	RPMSG_ETH_RESP_SHM_INFO,
 	RPMSG_ETH_RESP_SET_MAC_ADDR,
+	RPMSG_ETH_RESP_ADD_MC_ADDR,
+	RPMSG_ETH_RESP_DEL_MC_ADDR,
 
 	/* Notification types */
 	RPMSG_ETH_NOTIFY_PORT_UP,
@@ -219,6 +223,10 @@ enum rpmsg_eth_state {
  * @state: Interface state
  * @state_work: Delayed work for state machine
  * @sync_msg: Completion for synchronous message
+ * @rx_mode_work: Work structure for rx mode
+ * @cmd_wq: Workqueue for commands
+ * @mc_list: List of multicast addresses
+ * @mcast_addr: Multicast address filter
  */
 struct rpmsg_eth_common {
 	struct rpmsg_device *rpdev;
@@ -236,6 +244,10 @@ struct rpmsg_eth_common {
 	struct mutex state_lock;
 	struct delayed_work state_work;
 	struct completion sync_msg;
+	struct work_struct rx_mode_work;
+	struct workqueue_struct *cmd_wq;
+	struct netdev_hw_addr_list mc_list;
+	u8 mcast_addr[ETH_ALEN];
 };
 
 /**
-- 
2.34.1