Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

Pull networking updates from David Miller:

 1) Support ipv6 checksum offload in sunvnet driver, from Shannon
    Nelson.

 2) Move to RB-tree instead of custom AVL code in inetpeer, from Eric
    Dumazet.

 3) Allow generic XDP to work on virtual devices, from John Fastabend.

 4) Add bpf device maps and XDP_REDIRECT, which can be used to build
    arbitrary switching frameworks using XDP. From John Fastabend.

 5) Remove UFO offloads from the tree, gave us little other than bugs.

 6) Remove the IPSEC flow cache, from Florian Westphal.

 7) Support ipv6 route offload in mlxsw driver.

 8) Support VF representors in bnxt_en, from Sathya Perla.

 9) Add support for forward error correction modes to ethtool, from
    Vidya Sagar Ravipati.

10) Add time filter for packet scheduler action dumping, from Jamal Hadi
    Salim.

11) Extend the zerocopy sendmsg() used by virtio and tap to regular
    sockets via MSG_ZEROCOPY. From Willem de Bruijn.

12) Significantly rework value tracking in the BPF verifier, from Edward
    Cree.

13) Add new jump instructions to eBPF, from Daniel Borkmann.

14) Rework rtnetlink plumbing so that operations can be run without
    taking the RTNL semaphore. From Florian Westphal.

15) Support XDP in tap driver, from Jason Wang.

16) Add 32-bit eBPF JIT for ARM, from Shubham Bansal.

17) Add Huawei hinic ethernet driver.

18) Allow to report MD5 keys in TCP inet_diag dumps, from Ivan
    Delalande.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1780 commits)
  i40e: point wb_desc at the nvm_wb_desc during i40e_read_nvm_aq
  i40e: avoid NVM acquire deadlock during NVM update
  drivers: net: xgene: Remove return statement from void function
  drivers: net: xgene: Configure tx/rx delay for ACPI
  drivers: net: xgene: Read tx/rx delay for ACPI
  rocker: fix kcalloc parameter order
  rds: Fix non-atomic operation on shared flag variable
  net: sched: don't use GFP_KERNEL under spin lock
  vhost_net: correctly check tx avail during rx busy polling
  net: mdio-mux: add mdio_mux parameter to mdio_mux_init()
  rxrpc: Make service connection lookup always check for retry
  net: stmmac: Delete dead code for MDIO registration
  gianfar: Fix Tx flow control deactivation
  cxgb4: Ignore MPS_TX_INT_CAUSE[Bubble] for T6
  cxgb4: Fix pause frame count in t4_get_port_stats
  cxgb4: fix memory leak
  tun: rename generic_xdp to skb_xdp
  tun: reserve extra headroom only when XDP is set
  net: dsa: bcm_sf2: Configure IMP port TC2QOS mapping
  net: dsa: bcm_sf2: Advertise number of egress queues
  ...

1 files changed, 356 insertions, 0 deletions

diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c
new file mode 100644
index 000000000000..98f22551eb45
--- /dev/null
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c
@@ -0,0 +1,356 @@
+/* Copyright (c) 2013-2017, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * RMNET configuration engine
+ *
+ */
+
+#include <net/sock.h>
+#include <linux/module.h>
+#include <linux/netlink.h>
+#include <linux/netdevice.h>
+#include "rmnet_config.h"
+#include "rmnet_handlers.h"
+#include "rmnet_vnd.h"
+#include "rmnet_private.h"
+
+/* Locking scheme -
+ * The shared resource which needs to be protected is realdev->rx_handler_data.
+ * For the writer path, this is using rtnl_lock(). The writer paths are
+ * rmnet_newlink(), rmnet_dellink() and rmnet_force_unassociate_device(). These
+ * paths are already called with rtnl_lock() acquired in. There is also an
+ * ASSERT_RTNL() to ensure that we are calling with rtnl acquired. For
+ * dereference here, we will need to use rtnl_dereference(). Dev list writing
+ * needs to happen with rtnl_lock() acquired for netdev_master_upper_dev_link().
+ * For the reader path, the real_dev->rx_handler_data is called in the TX / RX
+ * path. We only need rcu_read_lock() for these scenarios. In these cases,
+ * the rcu_read_lock() is held in __dev_queue_xmit() and
+ * netif_receive_skb_internal(), so readers need to use rcu_dereference_rtnl()
+ * to get the relevant information. For dev list reading, we again acquire
+ * rcu_read_lock() in rmnet_dellink() for netdev_master_upper_dev_get_rcu().
+ * We also use unregister_netdevice_many() to free all rmnet devices in
+ * rmnet_force_unassociate_device() so we dont lose the rtnl_lock() and free in
+ * same context.
+ */
+
+/* Local Definitions and Declarations */
+
+struct rmnet_walk_data {
+	struct net_device *real_dev;
+	struct list_head *head;
+	struct rmnet_port *port;
+};
+
+static int rmnet_is_real_dev_registered(const struct net_device *real_dev)
+{
+	rx_handler_func_t *rx_handler;
+
+	rx_handler = rcu_dereference(real_dev->rx_handler);
+	return (rx_handler == rmnet_rx_handler);
+}
+
+/* Needs rtnl lock */
+static struct rmnet_port*
+rmnet_get_port_rtnl(const struct net_device *real_dev)
+{
+	return rtnl_dereference(real_dev->rx_handler_data);
+}
+
+static struct rmnet_endpoint*
+rmnet_get_endpoint(struct net_device *dev, int config_id)
+{
+	struct rmnet_endpoint *ep;
+	struct rmnet_port *port;
+
+	if (!rmnet_is_real_dev_registered(dev)) {
+		ep = rmnet_vnd_get_endpoint(dev);
+	} else {
+		port = rmnet_get_port_rtnl(dev);
+
+		ep = &port->muxed_ep[config_id];
+	}
+
+	return ep;
+}
+
+static int rmnet_unregister_real_device(struct net_device *real_dev,
+					struct rmnet_port *port)
+{
+	if (port->nr_rmnet_devs)
+		return -EINVAL;
+
+	kfree(port);
+
+	netdev_rx_handler_unregister(real_dev);
+
+	/* release reference on real_dev */
+	dev_put(real_dev);
+
+	netdev_dbg(real_dev, "Removed from rmnet\n");
+	return 0;
+}
+
+static int rmnet_register_real_device(struct net_device *real_dev)
+{
+	struct rmnet_port *port;
+	int rc;
+
+	ASSERT_RTNL();
+
+	if (rmnet_is_real_dev_registered(real_dev))
+		return 0;
+
+	port = kzalloc(sizeof(*port), GFP_ATOMIC);
+	if (!port)
+		return -ENOMEM;
+
+	port->dev = real_dev;
+	rc = netdev_rx_handler_register(real_dev, rmnet_rx_handler, port);
+	if (rc) {
+		kfree(port);
+		return -EBUSY;
+	}
+
+	/* hold on to real dev for MAP data */
+	dev_hold(real_dev);
+
+	netdev_dbg(real_dev, "registered with rmnet\n");
+	return 0;
+}
+
+static void rmnet_set_endpoint_config(struct net_device *dev,
+				      u8 mux_id, u8 rmnet_mode,
+				      struct net_device *egress_dev)
+{
+	struct rmnet_endpoint *ep;
+
+	netdev_dbg(dev, "id %d mode %d dev %s\n",
+		   mux_id, rmnet_mode, egress_dev->name);
+
+	ep = rmnet_get_endpoint(dev, mux_id);
+	/* This config is cleared on every set, so its ok to not
+	 * clear it on a device delete.
+	 */
+	memset(ep, 0, sizeof(struct rmnet_endpoint));
+	ep->rmnet_mode = rmnet_mode;
+	ep->egress_dev = egress_dev;
+	ep->mux_id = mux_id;
+}
+
+static int rmnet_newlink(struct net *src_net, struct net_device *dev,
+			 struct nlattr *tb[], struct nlattr *data[],
+			 struct netlink_ext_ack *extack)
+{
+	int ingress_format = RMNET_INGRESS_FORMAT_DEMUXING |
+			     RMNET_INGRESS_FORMAT_DEAGGREGATION |
+			     RMNET_INGRESS_FORMAT_MAP;
+	int egress_format = RMNET_EGRESS_FORMAT_MUXING |
+			    RMNET_EGRESS_FORMAT_MAP;
+	struct net_device *real_dev;
+	int mode = RMNET_EPMODE_VND;
+	struct rmnet_port *port;
+	int err = 0;
+	u16 mux_id;
+
+	real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
+	if (!real_dev || !dev)
+		return -ENODEV;
+
+	if (!data[IFLA_VLAN_ID])
+		return -EINVAL;
+
+	mux_id = nla_get_u16(data[IFLA_VLAN_ID]);
+
+	err = rmnet_register_real_device(real_dev);
+	if (err)
+		goto err0;
+
+	port = rmnet_get_port_rtnl(real_dev);
+	err = rmnet_vnd_newlink(mux_id, dev, port, real_dev);
+	if (err)
+		goto err1;
+
+	err = netdev_master_upper_dev_link(dev, real_dev, NULL, NULL);
+	if (err)
+		goto err2;
+
+	netdev_dbg(dev, "data format [ingress 0x%08X] [egress 0x%08X]\n",
+		   ingress_format, egress_format);
+	port->egress_data_format = egress_format;
+	port->ingress_data_format = ingress_format;
+
+	rmnet_set_endpoint_config(real_dev, mux_id, mode, dev);
+	rmnet_set_endpoint_config(dev, mux_id, mode, real_dev);
+	return 0;
+
+err2:
+	rmnet_vnd_dellink(mux_id, port);
+err1:
+	rmnet_unregister_real_device(real_dev, port);
+err0:
+	return err;
+}
+
+static void rmnet_dellink(struct net_device *dev, struct list_head *head)
+{
+	struct net_device *real_dev;
+	struct rmnet_port *port;
+	u8 mux_id;
+
+	rcu_read_lock();
+	real_dev = netdev_master_upper_dev_get_rcu(dev);
+	rcu_read_unlock();
+
+	if (!real_dev || !rmnet_is_real_dev_registered(real_dev))
+		return;
+
+	port = rmnet_get_port_rtnl(real_dev);
+
+	mux_id = rmnet_vnd_get_mux(dev);
+	rmnet_vnd_dellink(mux_id, port);
+	netdev_upper_dev_unlink(dev, real_dev);
+	rmnet_unregister_real_device(real_dev, port);
+
+	unregister_netdevice_queue(dev, head);
+}
+
+static int rmnet_dev_walk_unreg(struct net_device *rmnet_dev, void *data)
+{
+	struct rmnet_walk_data *d = data;
+	u8 mux_id;
+
+	mux_id = rmnet_vnd_get_mux(rmnet_dev);
+
+	rmnet_vnd_dellink(mux_id, d->port);
+	netdev_upper_dev_unlink(rmnet_dev, d->real_dev);
+	unregister_netdevice_queue(rmnet_dev, d->head);
+
+	return 0;
+}
+
+static void rmnet_force_unassociate_device(struct net_device *dev)
+{
+	struct net_device *real_dev = dev;
+	struct rmnet_walk_data d;
+	struct rmnet_port *port;
+	LIST_HEAD(list);
+
+	if (!rmnet_is_real_dev_registered(real_dev))
+		return;
+
+	ASSERT_RTNL();
+
+	d.real_dev = real_dev;
+	d.head = &list;
+
+	port = rmnet_get_port_rtnl(dev);
+	d.port = port;
+
+	rcu_read_lock();
+	netdev_walk_all_lower_dev_rcu(real_dev, rmnet_dev_walk_unreg, &d);
+	rcu_read_unlock();
+	unregister_netdevice_many(&list);
+
+	rmnet_unregister_real_device(real_dev, port);
+}
+
+static int rmnet_config_notify_cb(struct notifier_block *nb,
+				  unsigned long event, void *data)
+{
+	struct net_device *dev = netdev_notifier_info_to_dev(data);
+
+	if (!dev)
+		return NOTIFY_DONE;
+
+	switch (event) {
+	case NETDEV_UNREGISTER:
+		netdev_dbg(dev, "Kernel unregister\n");
+		rmnet_force_unassociate_device(dev);
+		break;
+
+	default:
+		break;
+	}
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block rmnet_dev_notifier __read_mostly = {
+	.notifier_call = rmnet_config_notify_cb,
+};
+
+static int rmnet_rtnl_validate(struct nlattr *tb[], struct nlattr *data[],
+			       struct netlink_ext_ack *extack)
+{
+	u16 mux_id;
+
+	if (!data || !data[IFLA_VLAN_ID])
+		return -EINVAL;
+
+	mux_id = nla_get_u16(data[IFLA_VLAN_ID]);
+	if (mux_id > (RMNET_MAX_LOGICAL_EP - 1))
+		return -ERANGE;
+
+	return 0;
+}
+
+static size_t rmnet_get_size(const struct net_device *dev)
+{
+	return nla_total_size(2); /* IFLA_VLAN_ID */
+}
+
+struct rtnl_link_ops rmnet_link_ops __read_mostly = {
+	.kind		= "rmnet",
+	.maxtype	= __IFLA_VLAN_MAX,
+	.priv_size	= sizeof(struct rmnet_priv),
+	.setup		= rmnet_vnd_setup,
+	.validate	= rmnet_rtnl_validate,
+	.newlink	= rmnet_newlink,
+	.dellink	= rmnet_dellink,
+	.get_size	= rmnet_get_size,
+};
+
+/* Needs either rcu_read_lock() or rtnl lock */
+struct rmnet_port *rmnet_get_port(struct net_device *real_dev)
+{
+	if (rmnet_is_real_dev_registered(real_dev))
+		return rcu_dereference_rtnl(real_dev->rx_handler_data);
+	else
+		return NULL;
+}
+
+/* Startup/Shutdown */
+
+static int __init rmnet_init(void)
+{
+	int rc;
+
+	rc = register_netdevice_notifier(&rmnet_dev_notifier);
+	if (rc != 0)
+		return rc;
+
+	rc = rtnl_link_register(&rmnet_link_ops);
+	if (rc != 0) {
+		unregister_netdevice_notifier(&rmnet_dev_notifier);
+		return rc;
+	}
+	return rc;
+}
+
+static void __exit rmnet_exit(void)
+{
+	unregister_netdevice_notifier(&rmnet_dev_notifier);
+	rtnl_link_unregister(&rmnet_link_ops);
+}
+
+module_init(rmnet_init)
+module_exit(rmnet_exit)
+MODULE_LICENSE("GPL v2");