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net: bridge: change unicast boolean to exact pkt_type 

Remove the unicast flag and introduce an exact pkt_type. That would help us
for the upcoming per-port multicast flood flag and also slightly reduce the
tests in the input fast path.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2016-08-31 15:36:51 +02:00 committed by David S. Miller
parent d297653dd6
commit 8addd5e7d3
4 changed files with 37 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
net/bridge/br_device.c
View File

@ -62,10 +62,10 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
goto out;
if (is_broadcast_ether_addr(dest)) {
br_flood(br, skb, false, false, true);
br_flood(br, skb, BR_PKT_BROADCAST, false, true);
} else if (is_multicast_ether_addr(dest)) {
if (unlikely(netpoll_tx_running(dev))) {
br_flood(br, skb, false, false, true);
br_flood(br, skb, BR_PKT_MULTICAST, false, true);
goto out;
}
if (br_multicast_rcv(br, NULL, skb, vid)) {
@ -78,11 +78,11 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
br_multicast_querier_exists(br, eth_hdr(skb)))
br_multicast_flood(mdst, skb, false, true);
else
br_flood(br, skb, false, false, true);
br_flood(br, skb, BR_PKT_MULTICAST, false, true);
} else if ((dst = __br_fdb_get(br, dest, vid)) != NULL) {
br_forward(dst->dst, skb, false, true);
} else {
br_flood(br, skb, true, false, true);
br_flood(br, skb, BR_PKT_UNICAST, false, true);
}
out:
rcu_read_unlock();

4
net/bridge/br_forward.c
View File

@ -176,7 +176,7 @@ static struct net_bridge_port *maybe_deliver(
/* called under rcu_read_lock */
void br_flood(struct net_bridge *br, struct sk_buff *skb,
bool unicast, bool local_rcv, bool local_orig)
enum br_pkt_type pkt_type, bool local_rcv, bool local_orig)
{
u8 igmp_type = br_multicast_igmp_type(skb);
struct net_bridge_port *prev = NULL;
@ -184,7 +184,7 @@ void br_flood(struct net_bridge *br, struct sk_buff *skb,
list_for_each_entry_rcu(p, &br->port_list, list) {
/* Do not flood unicast traffic to ports that turn it off */
if (unicast && !(p->flags & BR_FLOOD))
if (pkt_type == BR_PKT_UNICAST && !(p->flags & BR_FLOOD))
continue;
/* Do not flood to ports that enable proxy ARP */

40
net/bridge/br_input.c
View File

@ -131,11 +131,12 @@ static void br_do_proxy_arp(struct sk_buff *skb, struct net_bridge *br,
/* note: already called with rcu_read_lock */
int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
{
bool local_rcv = false, mcast_hit = false, unicast = true;
struct net_bridge_port *p = br_port_get_rcu(skb->dev);
const unsigned char *dest = eth_hdr(skb)->h_dest;
enum br_pkt_type pkt_type = BR_PKT_UNICAST;
struct net_bridge_fdb_entry *dst = NULL;
struct net_bridge_mdb_entry *mdst;
bool local_rcv, mcast_hit = false;
struct net_bridge *br;
u16 vid = 0;
@ -152,24 +153,29 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb
if (p->flags & BR_LEARNING)
br_fdb_update(br, p, eth_hdr(skb)->h_source, vid, false);
if (!is_broadcast_ether_addr(dest) && is_multicast_ether_addr(dest) &&
br_multicast_rcv(br, p, skb, vid))
goto drop;
local_rcv = !!(br->dev->flags & IFF_PROMISC);
if (is_multicast_ether_addr(dest)) {
/* by definition the broadcast is also a multicast address */
if (is_broadcast_ether_addr(dest)) {
pkt_type = BR_PKT_BROADCAST;
local_rcv = true;
} else {
pkt_type = BR_PKT_MULTICAST;
if (br_multicast_rcv(br, p, skb, vid))
goto drop;
}
}
if (p->state == BR_STATE_LEARNING)
goto drop;
BR_INPUT_SKB_CB(skb)->brdev = br->dev;
local_rcv = !!(br->dev->flags & IFF_PROMISC);
if (IS_ENABLED(CONFIG_INET) && skb->protocol == htons(ETH_P_ARP))
br_do_proxy_arp(skb, br, vid, p);
if (is_broadcast_ether_addr(dest)) {
local_rcv = true;
unicast = false;
} else if (is_multicast_ether_addr(dest)) {
switch (pkt_type) {
case BR_PKT_MULTICAST:
mdst = br_mdb_get(br, skb, vid);
if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
br_multicast_querier_exists(br, eth_hdr(skb))) {
@ -183,18 +189,22 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb
local_rcv = true;
br->dev->stats.multicast++;
}
unicast = false;
} else if ((dst = __br_fdb_get(br, dest, vid)) && dst->is_local) {
/* Do not forward the packet since it's local. */
return br_pass_frame_up(skb);
break;
case BR_PKT_UNICAST:
dst = __br_fdb_get(br, dest, vid);
default:
break;
}
if (dst) {
if (dst->is_local)
return br_pass_frame_up(skb);
dst->used = jiffies;
br_forward(dst->dst, skb, local_rcv, false);
} else {
if (!mcast_hit)
br_flood(br, skb, unicast, local_rcv, false);
br_flood(br, skb, pkt_type, local_rcv, false);
else
br_multicast_flood(mdst, skb, local_rcv, false);
}

7
net/bridge/br_private.h
View File

@ -517,12 +517,17 @@ int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
const unsigned char *addr, u16 vid);
/* br_forward.c */
enum br_pkt_type {
BR_PKT_UNICAST,
BR_PKT_MULTICAST,
BR_PKT_BROADCAST
};
int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
void br_forward(const struct net_bridge_port *to, struct sk_buff *skb,
bool local_rcv, bool local_orig);
int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
void br_flood(struct net_bridge *br, struct sk_buff *skb,
bool unicast, bool local_rcv, bool local_orig);
enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
/* br_if.c */
void br_port_carrier_check(struct net_bridge_port *p);