From 5b60dadb71db7df94b824a0fab20acc1eabb9050 Mon Sep 17 00:00:00 2001 From: Tobias Waldekranz Date: Wed, 13 Jan 2021 09:42:55 +0100 Subject: [PATCH] net: dsa: tag_dsa: Support reception of packets from LAG devices Packets ingressing on a LAG that egress on the CPU port, which are not classified as management, will have a FORWARD tag that does not contain the normal source device/port tuple. Instead the trunk bit will be set, and the port field holds the LAG id. Since the exact source port information is not available in the tag, frames are injected directly on the LAG interface and thus do never pass through any DSA port interface on ingress. Management frames (TO_CPU) are not affected and will pass through the DSA port interface as usual. Signed-off-by: Tobias Waldekranz Reviewed-by: Florian Fainelli Reviewed-by: Vladimir Oltean Signed-off-by: Jakub Kicinski --- net/dsa/dsa.c | 12 +++++++++++- net/dsa/tag_dsa.c | 17 ++++++++++++++++- 2 files changed, 27 insertions(+), 2 deletions(-) diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c index df75481..f4ce3c5 100644 --- a/net/dsa/dsa.c +++ b/net/dsa/dsa.c @@ -219,11 +219,21 @@ static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev, } skb = nskb; - p = netdev_priv(skb->dev); skb_push(skb, ETH_HLEN); skb->pkt_type = PACKET_HOST; skb->protocol = eth_type_trans(skb, skb->dev); + if (unlikely(!dsa_slave_dev_check(skb->dev))) { + /* Packet is to be injected directly on an upper + * device, e.g. a team/bond, so skip all DSA-port + * specific actions. + */ + netif_rx(skb); + return 0; + } + + p = netdev_priv(skb->dev); + if (unlikely(cpu_dp->ds->untag_bridge_pvid)) { nskb = dsa_untag_bridge_pvid(skb); if (!nskb) { diff --git a/net/dsa/tag_dsa.c b/net/dsa/tag_dsa.c index 112c7c6..7e7b7de 100644 --- a/net/dsa/tag_dsa.c +++ b/net/dsa/tag_dsa.c @@ -163,6 +163,7 @@ static struct sk_buff *dsa_rcv_ll(struct sk_buff *skb, struct net_device *dev, u8 extra) { int source_device, source_port; + bool trunk = false; enum dsa_code code; enum dsa_cmd cmd; u8 *dsa_header; @@ -174,6 +175,8 @@ static struct sk_buff *dsa_rcv_ll(struct sk_buff *skb, struct net_device *dev, switch (cmd) { case DSA_CMD_FORWARD: skb->offload_fwd_mark = 1; + + trunk = !!(dsa_header[1] & 7); break; case DSA_CMD_TO_CPU: @@ -216,7 +219,19 @@ static struct sk_buff *dsa_rcv_ll(struct sk_buff *skb, struct net_device *dev, source_device = dsa_header[0] & 0x1f; source_port = (dsa_header[1] >> 3) & 0x1f; - skb->dev = dsa_master_find_slave(dev, source_device, source_port); + if (trunk) { + struct dsa_port *cpu_dp = dev->dsa_ptr; + + /* The exact source port is not available in the tag, + * so we inject the frame directly on the upper + * team/bond. + */ + skb->dev = dsa_lag_dev(cpu_dp->dst, source_port); + } else { + skb->dev = dsa_master_find_slave(dev, source_device, + source_port); + } + if (!skb->dev) return NULL; -- 2.7.4