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

Pull networking updates from David Miller:
 "Highlights:

   1) Maintain the TCP retransmit queue using an rbtree, with 1GB
      windows at 100Gb this really has become necessary. From Eric
      Dumazet.

   2) Multi-program support for cgroup+bpf, from Alexei Starovoitov.

   3) Perform broadcast flooding in hardware in mv88e6xxx, from Andrew
      Lunn.

   4) Add meter action support to openvswitch, from Andy Zhou.

   5) Add a data meta pointer for BPF accessible packets, from Daniel
      Borkmann.

   6) Namespace-ify almost all TCP sysctl knobs, from Eric Dumazet.

   7) Turn on Broadcom Tags in b53 driver, from Florian Fainelli.

   8) More work to move the RTNL mutex down, from Florian Westphal.

   9) Add 'bpftool' utility, to help with bpf program introspection.
      From Jakub Kicinski.

  10) Add new 'cpumap' type for XDP_REDIRECT action, from Jesper
      Dangaard Brouer.

  11) Support 'blocks' of transformations in the packet scheduler which
      can span multiple network devices, from Jiri Pirko.

  12) TC flower offload support in cxgb4, from Kumar Sanghvi.

  13) Priority based stream scheduler for SCTP, from Marcelo Ricardo
      Leitner.

  14) Thunderbolt networking driver, from Amir Levy and Mika Westerberg.

  15) Add RED qdisc offloadability, and use it in mlxsw driver. From
      Nogah Frankel.

  16) eBPF based device controller for cgroup v2, from Roman Gushchin.

  17) Add some fundamental tracepoints for TCP, from Song Liu.

  18) Remove garbage collection from ipv6 route layer, this is a
      significant accomplishment. From Wei Wang.

  19) Add multicast route offload support to mlxsw, from Yotam Gigi"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (2177 commits)
  tcp: highest_sack fix
  geneve: fix fill_info when link down
  bpf: fix lockdep splat
  net: cdc_ncm: GetNtbFormat endian fix
  openvswitch: meter: fix NULL pointer dereference in ovs_meter_cmd_reply_start
  netem: remove unnecessary 64 bit modulus
  netem: use 64 bit divide by rate
  tcp: Namespace-ify sysctl_tcp_default_congestion_control
  net: Protect iterations over net::fib_notifier_ops in fib_seq_sum()
  ipv6: set all.accept_dad to 0 by default
  uapi: fix linux/tls.h userspace compilation error
  usbnet: ipheth: prevent TX queue timeouts when device not ready
  vhost_net: conditionally enable tx polling
  uapi: fix linux/rxrpc.h userspace compilation errors
  net: stmmac: fix LPI transitioning for dwmac4
  atm: horizon: Fix irq release error
  net-sysfs: trigger netlink notification on ifalias change via sysfs
  openvswitch: Using kfree_rcu() to simplify the code
  openvswitch: Make local function ovs_nsh_key_attr_size() static
  openvswitch: Fix return value check in ovs_meter_cmd_features()
  ...

1 files changed, 33 insertions, 22 deletions

diff --git a/net/dsa/tag_lan9303.c b/net/dsa/tag_lan9303.c
index 0b9826105e42..548c00254c07 100644
--- a/net/dsa/tag_lan9303.c
+++ b/net/dsa/tag_lan9303.c
@@ -11,6 +11,7 @@
  * GNU General Public License for more details.
  *
  */
+#include <linux/dsa/lan9303.h>
 #include <linux/etherdevice.h>
 #include <linux/list.h>
 #include <linux/slab.h>
@@ -39,10 +40,30 @@
  */
 
 #define LAN9303_TAG_LEN 4
+# define LAN9303_TAG_TX_USE_ALR BIT(3)
+# define LAN9303_TAG_TX_STP_OVERRIDE BIT(4)
+# define LAN9303_TAG_RX_IGMP BIT(3)
+# define LAN9303_TAG_RX_STP BIT(4)
+# define LAN9303_TAG_RX_TRAPPED_TO_CPU (LAN9303_TAG_RX_IGMP | \
+					LAN9303_TAG_RX_STP)
+
+/* Decide whether to transmit using ALR lookup, or transmit directly to
+ * port using tag. ALR learning is performed only when using ALR lookup.
+ * If the two external ports are bridged and the frame is unicast,
+ * then use ALR lookup to allow ALR learning on CPU port.
+ * Otherwise transmit directly to port with STP state override.
+ * See also: lan9303_separate_ports() and lan9303.pdf 6.4.10.1
+ */
+static int lan9303_xmit_use_arl(struct dsa_port *dp, u8 *dest_addr)
+{
+	struct lan9303 *chip = dp->ds->priv;
+
+	return chip->is_bridged && !is_multicast_ether_addr(dest_addr);
+}
 
 static struct sk_buff *lan9303_xmit(struct sk_buff *skb, struct net_device *dev)
 {
-	struct dsa_slave_priv *p = netdev_priv(dev);
+	struct dsa_port *dp = dsa_slave_to_port(dev);
 	u16 *lan9303_tag;
 
 	/* insert a special VLAN tag between the MAC addresses
@@ -62,26 +83,21 @@ static struct sk_buff *lan9303_xmit(struct sk_buff *skb, struct net_device *dev)
 
 	lan9303_tag = (u16 *)(skb->data + 2 * ETH_ALEN);
 	lan9303_tag[0] = htons(ETH_P_8021Q);
-	lan9303_tag[1] = htons(p->dp->index | BIT(4));
+	lan9303_tag[1] = lan9303_xmit_use_arl(dp, skb->data) ?
+				LAN9303_TAG_TX_USE_ALR :
+				dp->index | LAN9303_TAG_TX_STP_OVERRIDE;
+	lan9303_tag[1] = htons(lan9303_tag[1]);
 
 	return skb;
 }
 
 static struct sk_buff *lan9303_rcv(struct sk_buff *skb, struct net_device *dev,
-			struct packet_type *pt)
+				   struct packet_type *pt)
 {
 	u16 *lan9303_tag;
-	struct dsa_switch_tree *dst = dev->dsa_ptr;
-	struct dsa_switch *ds;
+	u16 lan9303_tag1;
 	unsigned int source_port;
 
-	ds = dst->ds[0];
-
-	if (unlikely(!ds)) {
-		dev_warn_ratelimited(&dev->dev, "Dropping packet, due to missing DSA switch device\n");
-		return NULL;
-	}
-
 	if (unlikely(!pskb_may_pull(skb, LAN9303_TAG_LEN))) {
 		dev_warn_ratelimited(&dev->dev,
 				     "Dropping packet, cannot pull\n");
@@ -101,27 +117,22 @@ static struct sk_buff *lan9303_rcv(struct sk_buff *skb, struct net_device *dev,
 		return NULL;
 	}
 
-	source_port = ntohs(lan9303_tag[1]) & 0x3;
+	lan9303_tag1 = ntohs(lan9303_tag[1]);
+	source_port = lan9303_tag1 & 0x3;
 
-	if (source_port >= ds->num_ports) {
+	skb->dev = dsa_master_find_slave(dev, 0, source_port);
+	if (!skb->dev) {
 		dev_warn_ratelimited(&dev->dev, "Dropping packet due to invalid source port\n");
 		return NULL;
 	}
 
-	if (!ds->ports[source_port].netdev) {
-		dev_warn_ratelimited(&dev->dev, "Dropping packet due to invalid netdev or device\n");
-		return NULL;
-	}
-
 	/* remove the special VLAN tag between the MAC addresses
 	 * and the current ethertype field.
 	 */
 	skb_pull_rcsum(skb, 2 + 2);
 	memmove(skb->data - ETH_HLEN, skb->data - (ETH_HLEN + LAN9303_TAG_LEN),
 		2 * ETH_ALEN);
-
-	/* forward the packet to the dedicated interface */
-	skb->dev = ds->ports[source_port].netdev;
+	skb->offload_fwd_mark = !(lan9303_tag1 & LAN9303_TAG_RX_TRAPPED_TO_CPU);
 
 	return skb;
 }