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Message-ID: <4B0BB89F.7030605@trash.net>
Date: Tue, 24 Nov 2009 11:42:39 +0100
From: Patrick McHardy <kaber@...sh.net>
To: Arnd Bergmann <arnd@...db.de>
CC: Eric Dumazet <eric.dumazet@...il.com>,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
David Miller <davem@...emloft.net>,
Stephen Hemminger <shemminger@...tta.com>,
Herbert Xu <herbert@...dor.apana.org.au>,
Patrick Mullaney <pmullaney@...ell.com>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Edge Virtual Bridging <evb@...oogroups.com>,
Anna Fischer <anna.fischer@...com>,
bridge@...ts.linux-foundation.org,
virtualization@...ts.linux-foundation.org,
Jens Osterkamp <jens@...ux.vnet.ibm.com>,
Gerhard Stenzel <gerhard.stenzel@...ibm.com>,
Mark Smith <lk-netdev@...netdev.nosense.org>
Subject: Re: [PATCH 3/4] macvlan: implement bridge, VEPA and private mode
Arnd Bergmann wrote:
> This allows each macvlan slave device to be in one
> of three modes, depending on the use case:
>
> MACVLAN_PRIVATE:
> The device never communicates with any other device
> on the same upper_dev. This even includes frames
> coming back from a reflective relay, where supported
> by the adjacent bridge.
>
> MACVLAN_VEPA:
> The new Virtual Ethernet Port Aggregator (VEPA) mode,
> we assume that the adjacent bridge returns all frames
> where both source and destination are local to the
> macvlan port, i.e. the bridge is set up as a reflective
> relay.
> Broadcast frames coming in from the upper_dev get
> flooded to all macvlan interfaces in VEPA mode.
> We never deliver any frames locally.
>
> MACVLAN_BRIDGE:
> We provide the behavior of a simple bridge between
> different macvlan interfaces on the same port. Frames
> from one interface to another one get delivered directly
> and are not sent out externally. Broadcast frames get
> flooded to all other bridge ports and to the external
> interface, but when they come back from a reflective
> relay, we don't deliver them again.
> Since we know all the MAC addresses, the macvlan bridge
> mode does not require learning or STP like the bridge
> module does.
This looks pretty nice. Some stylistic nitpicking below :)
> diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
> index a0dea23..b840b3a 100644
> --- a/drivers/net/macvlan.c
> +++ b/drivers/net/macvlan.c
> @@ -29,9 +29,16 @@
> #include <linux/if_link.h>
> #include <linux/if_macvlan.h>
> #include <net/rtnetlink.h>
> +#include <net/xfrm.h>
Do we really need this?
> @@ -129,11 +137,14 @@ static inline void macvlan_count_rx(const struct macvlan_dev *vlan, int length,
> }
>
> static int macvlan_broadcast_one(struct sk_buff *skb, struct net_device *dev,
> - const struct ethhdr *eth)
> + const struct ethhdr *eth, int local)
bool local?
> {
> if (!skb)
> return NET_RX_DROP;
>
> + if (local)
> + return dev_forward_skb(dev, skb);
> +
> skb->dev = dev;
> if (!compare_ether_addr_64bits(eth->h_dest,
> dev->broadcast))
> @@ -145,7 +156,9 @@ static int macvlan_broadcast_one(struct sk_buff *skb, struct net_device *dev,
> }
>
> static void macvlan_broadcast(struct sk_buff *skb,
> - const struct macvlan_port *port)
> + const struct macvlan_port *port,
> + struct net_device *src,
> + enum macvlan_mode mode)
> {
> const struct ethhdr *eth = eth_hdr(skb);
> const struct macvlan_dev *vlan;
> @@ -159,8 +172,12 @@ static void macvlan_broadcast(struct sk_buff *skb,
>
> for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
> hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
> + if ((vlan->dev == src) || !(vlan->mode & mode))
Please remove those unnecessary parentheses around the
device comparison.
> @@ -173,6 +190,7 @@ static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb)
> const struct ethhdr *eth = eth_hdr(skb);
> const struct macvlan_port *port;
> const struct macvlan_dev *vlan;
> + const struct macvlan_dev *src;
> struct net_device *dev;
>
> port = rcu_dereference(skb->dev->macvlan_port);
> @@ -180,7 +198,20 @@ static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb)
> return skb;
>
> if (is_multicast_ether_addr(eth->h_dest)) {
> - macvlan_broadcast(skb, port);
> + src = macvlan_hash_lookup(port, eth->h_source);
> + if (!src)
> + /* frame comes from an external address */
> + macvlan_broadcast(skb, port, NULL, MACVLAN_MODE_PRIVATE
> + | MACVLAN_MODE_VEPA | MACVLAN_MODE_BRIDGE);
The '|' should go on the first line.
> + else if (src->mode == MACVLAN_MODE_VEPA)
> + /* flood to everyone except source */
> + macvlan_broadcast(skb, port, src->dev,
> + MACVLAN_MODE_VEPA | MACVLAN_MODE_BRIDGE);
> + else if (src->mode == MACVLAN_MODE_BRIDGE)
> + /* flood only to VEPA ports, bridge ports
> + already saw the frame */
Multi-line comments should begin every line with '*'.
> + macvlan_broadcast(skb, port, src->dev,
> + MACVLAN_MODE_VEPA);
Please align the mode values (in all cases above) to the arguments
on the line above.
> return skb;
> }
>
> @@ -203,18 +234,46 @@ static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb)
> return NULL;
> }
>
> +static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
> +{
> + const struct macvlan_dev *vlan = netdev_priv(dev);
> + const struct macvlan_port *port = vlan->port;
> + const struct macvlan_dev *dest;
> +
> + if (vlan->mode == MACVLAN_MODE_BRIDGE) {
> + const struct ethhdr *eth = (void *)skb->data;
eth_hdr()?
> +
> + /* send to other bridge ports directly */
> + if (is_multicast_ether_addr(eth->h_dest)) {
> + macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
> + goto xmit_world;
> + }
> +
> + dest = macvlan_hash_lookup(port, eth->h_dest);
> + if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
> + int length = skb->len + ETH_HLEN;
unsigned int for length values please.
> + int ret = dev_forward_skb(dest->dev, skb);
> + macvlan_count_rx(dest, length,
> + likely(ret == NET_RX_SUCCESS), 0);
> +
> + return NET_XMIT_SUCCESS;
> + }
> + }
> +
> +xmit_world:
> + skb->dev = vlan->lowerdev;
> + return dev_queue_xmit(skb);
> +}
--
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