add wifi6 8852be driver

hc

2024-12-19 9370bb92b2d16684ee45cf24e879c93c509162da

 kernel/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c
..
..
@@ -1,17 +1,7 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /* Copyright (c) 2013-2018, The Linux Foundation. All rights reserved.
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  *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 and
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- * only version 2 as published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- *
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  * RMNET Data virtual network driver
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- *
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  */
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6
 
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 #include <linux/etherdevice.h>
..
..
@@ -68,9 +58,30 @@
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 	return NETDEV_TX_OK;
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 }
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60
 
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+static int rmnet_vnd_headroom(struct rmnet_port *port)
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+{
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+	u32 headroom;
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+
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+	headroom = sizeof(struct rmnet_map_header);
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+
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+	if (port->data_format & RMNET_FLAGS_EGRESS_MAP_CKSUMV4)
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+		headroom += sizeof(struct rmnet_map_ul_csum_header);
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+
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+	return headroom;
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+}
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+
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 static int rmnet_vnd_change_mtu(struct net_device *rmnet_dev, int new_mtu)
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 {
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-	if (new_mtu < 0 || new_mtu > RMNET_MAX_PACKET_SIZE)
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+	struct rmnet_priv *priv = netdev_priv(rmnet_dev);
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+	struct rmnet_port *port;
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+	u32 headroom;
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+
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+	port = rmnet_get_port_rtnl(priv->real_dev);
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+
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+	headroom = rmnet_vnd_headroom(port);
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+
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+	if (new_mtu < 0 || new_mtu > RMNET_MAX_PACKET_SIZE ||
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+	    new_mtu > (priv->real_dev->mtu - headroom))
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 		return -EINVAL;
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 	rmnet_dev->mtu = new_mtu;
..
..
@@ -114,24 +125,24 @@
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 			      struct rtnl_link_stats64 *s)
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 {
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 	struct rmnet_priv *priv = netdev_priv(dev);
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-	struct rmnet_vnd_stats total_stats;
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+	struct rmnet_vnd_stats total_stats = { };
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 	struct rmnet_pcpu_stats *pcpu_ptr;
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+	struct rmnet_vnd_stats snapshot;
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 	unsigned int cpu, start;
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-
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-	memset(&total_stats, 0, sizeof(struct rmnet_vnd_stats));
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 	for_each_possible_cpu(cpu) {
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 		pcpu_ptr = per_cpu_ptr(priv->pcpu_stats, cpu);
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 		do {
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 			start = u64_stats_fetch_begin_irq(&pcpu_ptr->syncp);
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-			total_stats.rx_pkts += pcpu_ptr->stats.rx_pkts;
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-			total_stats.rx_bytes += pcpu_ptr->stats.rx_bytes;
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-			total_stats.tx_pkts += pcpu_ptr->stats.tx_pkts;
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-			total_stats.tx_bytes += pcpu_ptr->stats.tx_bytes;
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+			snapshot = pcpu_ptr->stats;	/* struct assignment */
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 		} while (u64_stats_fetch_retry_irq(&pcpu_ptr->syncp, start));
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-		total_stats.tx_drops += pcpu_ptr->stats.tx_drops;
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+		total_stats.rx_pkts += snapshot.rx_pkts;
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+		total_stats.rx_bytes += snapshot.rx_bytes;
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+		total_stats.tx_pkts += snapshot.tx_pkts;
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+		total_stats.tx_bytes += snapshot.tx_bytes;
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+		total_stats.tx_drops += snapshot.tx_drops;
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 	}
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 	s->rx_packets = total_stats.rx_pkts;
..
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@@ -222,6 +233,8 @@
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 	rmnet_dev->needs_free_netdev = true;
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 	rmnet_dev->ethtool_ops = &rmnet_ethtool_ops;
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+	rmnet_dev->features |= NETIF_F_LLTX;
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+
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 	/* This perm addr will be used as interface identifier by IPv6 */
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 	rmnet_dev->addr_assign_type = NET_ADDR_RANDOM;
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 	eth_random_addr(rmnet_dev->perm_addr);
..
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@@ -232,22 +245,31 @@
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 int rmnet_vnd_newlink(u8 id, struct net_device *rmnet_dev,
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 		      struct rmnet_port *port,
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 		      struct net_device *real_dev,
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-		      struct rmnet_endpoint *ep)
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+		      struct rmnet_endpoint *ep,
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+		      struct netlink_ext_ack *extack)
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+
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 {
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 	struct rmnet_priv *priv = netdev_priv(rmnet_dev);
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+	u32 headroom;
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 	int rc;
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-	if (ep->egress_dev)
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-		return -EINVAL;
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-
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-	if (rmnet_get_endpoint(port, id))
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+	if (rmnet_get_endpoint(port, id)) {
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+		NL_SET_ERR_MSG_MOD(extack, "MUX ID already exists");
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 		return -EBUSY;
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+	}
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 	rmnet_dev->hw_features = NETIF_F_RXCSUM;
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 	rmnet_dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
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 	rmnet_dev->hw_features |= NETIF_F_SG;
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 	priv->real_dev = real_dev;
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+
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+	headroom = rmnet_vnd_headroom(port);
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+
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+	if (rmnet_vnd_change_mtu(rmnet_dev, real_dev->mtu - headroom)) {
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+		NL_SET_ERR_MSG_MOD(extack, "Invalid MTU on real dev");
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+		return -EINVAL;
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+	}
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 	rc = register_netdevice(rmnet_dev);
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 	if (!rc) {
..
..
@@ -290,3 +312,45 @@
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 	return 0;
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 }
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+
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+int rmnet_vnd_validate_real_dev_mtu(struct net_device *real_dev)
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+{
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+	struct hlist_node *tmp_ep;
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+	struct rmnet_endpoint *ep;
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+	struct rmnet_port *port;
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+	unsigned long bkt_ep;
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+	u32 headroom;
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+
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+	port = rmnet_get_port_rtnl(real_dev);
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+
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+	headroom = rmnet_vnd_headroom(port);
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+
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+	hash_for_each_safe(port->muxed_ep, bkt_ep, tmp_ep, ep, hlnode) {
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+		if (ep->egress_dev->mtu > (real_dev->mtu - headroom))
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+			return -1;
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+	}
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+
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+	return 0;
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+}
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+
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+int rmnet_vnd_update_dev_mtu(struct rmnet_port *port,
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+			     struct net_device *real_dev)
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+{
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+	struct hlist_node *tmp_ep;
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+	struct rmnet_endpoint *ep;
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+	unsigned long bkt_ep;
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+	u32 headroom;
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+
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+	headroom = rmnet_vnd_headroom(port);
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+
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+	hash_for_each_safe(port->muxed_ep, bkt_ep, tmp_ep, ep, hlnode) {
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+		if (ep->egress_dev->mtu <= (real_dev->mtu - headroom))
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+			continue;
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+
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+		if (rmnet_vnd_change_mtu(ep->egress_dev,
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+					 real_dev->mtu - headroom))
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+			return -1;
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+	}
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+
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+	return 0;
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+}