Thread (26 messages) 26 messages, 4 authors, 2017-08-21

Re: [PATCH 4/6] mpls: VPLS support

From: Amine Kherbouche <hidden>
Date: 2017-08-21 15:14:56

quoted hunk ↗ jump to hunk
new file mode 100644
index 000000000000..28ac810da6e9
--- /dev/null
+++ b/net/mpls/vpls.c
@@ -0,0 +1,469 @@
+/*
+ *  net/mpls/vpls.c
+ *
+ *  Copyright (C) 2016 David Lamparter
+ *
+ */
+
+#include <linux/netdevice.h>
+#include <linux/slab.h>
+#include <linux/ethtool.h>
+#include <linux/etherdevice.h>
+#include <linux/u64_stats_sync.h>
+#include <linux/mpls.h>
+
+#include <net/rtnetlink.h>
+#include <net/dst.h>
+#include <net/xfrm.h>
+#include <net/mpls.h>
+#include <linux/module.h>
+#include <net/dst_metadata.h>
+#include <net/ip_tunnels.h>
some headers are not needed.

+
+static netdev_tx_t vpls_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	int err = -EINVAL, ok_count = 0;
+	struct vpls_priv *priv = netdev_priv(dev);
+	struct vpls_info *vi;
+	struct pcpu_sw_netstats *stats;
+	size_t len = skb->len;
+
+	rcu_read_lock();
+	vi = skb_vpls_info(skb);
+
+	skb_orphan(skb);
+	skb_forward_csum(skb);
+
+	if (vi) {
+		err = vpls_xmit_wire(skb, dev, priv, vi->pw_label);
+		if (err)
+			goto out_err;
+	} else {
the rcu_read_lock() is just needed for the else statement right ?
+		struct sk_buff *cloned;
+		struct vpls_wirelist *wl;
+		size_t i;
+
+		wl = rcu_dereference(priv->wires);
+		if (wl->count == 0) {
+			dev->stats.tx_carrier_errors++;
+			goto out_err;
+		}
+
+		for (i = 0; i < wl->count; i++) {
+			cloned = skb_clone(skb, GFP_KERNEL);
+			if (vpls_xmit_wire(cloned, dev, priv, wl->wires[i]))
+				consume_skb(cloned);
+			else
+				ok_count++;
+		}
+		if (!ok_count)
+			goto out_err;
+
+		consume_skb(skb);
+	}
+
+	stats = this_cpu_ptr(dev->tstats);
+	u64_stats_update_begin(&stats->syncp);
+	stats->tx_packets++;
+	stats->tx_bytes += len;
+	u64_stats_update_end(&stats->syncp);
+
+	rcu_read_unlock();
+	return 0;
+}
+int vpls_rcv(struct sk_buff *skb, struct net_device *in_dev,
+	     struct packet_type *pt, struct mpls_route *rt,
+	     struct mpls_shim_hdr *hdr, struct net_device *orig_dev)
+{
+	struct net_device *dev = rt->rt_vpls_dev;
+	struct mpls_entry_decoded dec;
+	struct metadata_dst *md_dst;
+	struct pcpu_sw_netstats *stats;
+
+	if (!dev)
+		goto drop_nodev;
+
we can get dec.bos from mpls stack as a function param, no need to 
decode the mpls header again.
+	dec = mpls_entry_decode(hdr);
+	if (!dec.bos) {
+		dev->stats.rx_frame_errors++;
+		goto drop;
+	}
+
+	skb_pull(skb, sizeof(*hdr));
+
+	if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) {
+		dev->stats.rx_length_errors++;
+		goto drop;
+	}

+static const struct net_device_ops vpls_netdev_ops = {
+	.ndo_init		= vpls_dev_init,
+	.ndo_open		= vpls_open,
+	.ndo_stop		= vpls_close,
+	.ndo_start_xmit		= vpls_xmit,
+	.ndo_change_mtu		= vpls_change_mtu,
+	.ndo_get_stats64	= ip_tunnel_get_stats64,
+	.ndo_set_rx_mode	= vpls_set_multicast_list,
+	.ndo_set_mac_address	= eth_mac_addr,
+	.ndo_features_check	= passthru_features_check,
+};
can you add .ndo_get_stats64 function ?

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