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openvswitch: Compact sw_flow_key.

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Minimize padding in sw_flow_key and move 'tp' top the main struct.
These changes simplify code when accessing the transport port numbers
and the tcp flags, and makes the sw_flow_key 8 bytes smaller on 64-bit
systems (128->120 bytes).  These changes also make the keys for IPv4
packets to fit in one cache line.

There is a valid concern for safety of packing the struct
ovs_key_ipv4_tunnel, as it would be possible to take the address of
the tun_id member as a __be64 * which could result in unaligned access
in some systems. However:

- sw_flow_key itself is 64-bit aligned, so the tun_id within is
  always
  64-bit aligned.
- We never make arrays of ovs_key_ipv4_tunnel (which would force
  every
  second tun_key to be misaligned).
- We never take the address of the tun_id in to a __be64 *.
- Whereever we use struct ovs_key_ipv4_tunnel outside the
  sw_flow_key,
  it is in stack (on tunnel input functions), where compiler has full
  control of the alignment.

Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
This commit is contained in:
Jarno Rajahalme
2014-05-05 09:54:49 -07:00
committed by Pravin B Shelar
parent 091b64868b
commit 1139e241ec
3 changed files with 62 additions and 123 deletions
Download Patch File Download Diff File Expand all files Collapse all files

44
net/openvswitch/flow.c
View File

@@ -64,17 +64,11 @@ u64 ovs_flow_used_time(unsigned long flow_jiffies)
void ovs_flow_stats_update(struct sw_flow *flow, struct sk_buff *skb)
{
struct flow_stats *stats;
__be16 tcp_flags = 0;
__be16 tcp_flags = flow->key.tp.flags;
int node = numa_node_id();
stats = rcu_dereference(flow->stats[node]);
if (likely(flow->key.ip.proto == IPPROTO_TCP)) {
if (likely(flow->key.eth.type == htons(ETH_P_IP)))
tcp_flags = flow->key.ipv4.tp.flags;
else if (likely(flow->key.eth.type == htons(ETH_P_IPV6)))
tcp_flags = flow->key.ipv6.tp.flags;
}
/* Check if already have node-specific stats. */
if (likely(stats)) {
spin_lock(&stats->lock);
@@ -357,8 +351,8 @@ static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
/* The ICMPv6 type and code fields use the 16-bit transport port
* fields, so we need to store them in 16-bit network byte order.
*/
key->ipv6.tp.src = htons(icmp->icmp6_type);
key->ipv6.tp.dst = htons(icmp->icmp6_code);
key->tp.src = htons(icmp->icmp6_type);
key->tp.dst = htons(icmp->icmp6_code);
if (icmp->icmp6_code == 0 &&
(icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION ||
@@ -520,21 +514,21 @@ int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key)
if (key->ip.proto == IPPROTO_TCP) {
if (tcphdr_ok(skb)) {
struct tcphdr *tcp = tcp_hdr(skb);
key->ipv4.tp.src = tcp->source;
key->ipv4.tp.dst = tcp->dest;
key->ipv4.tp.flags = TCP_FLAGS_BE16(tcp);
key->tp.src = tcp->source;
key->tp.dst = tcp->dest;
key->tp.flags = TCP_FLAGS_BE16(tcp);
}
} else if (key->ip.proto == IPPROTO_UDP) {
if (udphdr_ok(skb)) {
struct udphdr *udp = udp_hdr(skb);
key->ipv4.tp.src = udp->source;
key->ipv4.tp.dst = udp->dest;
key->tp.src = udp->source;
key->tp.dst = udp->dest;
}
} else if (key->ip.proto == IPPROTO_SCTP) {
if (sctphdr_ok(skb)) {
struct sctphdr *sctp = sctp_hdr(skb);
key->ipv4.tp.src = sctp->source;
key->ipv4.tp.dst = sctp->dest;
key->tp.src = sctp->source;
key->tp.dst = sctp->dest;
}
} else if (key->ip.proto == IPPROTO_ICMP) {
if (icmphdr_ok(skb)) {
@@ -542,8 +536,8 @@ int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key)
/* The ICMP type and code fields use the 16-bit
* transport port fields, so we need to store
* them in 16-bit network byte order. */
key->ipv4.tp.src = htons(icmp->type);
key->ipv4.tp.dst = htons(icmp->code);
key->tp.src = htons(icmp->type);
key->tp.dst = htons(icmp->code);
}
}
@@ -589,21 +583,21 @@ int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key)
if (key->ip.proto == NEXTHDR_TCP) {
if (tcphdr_ok(skb)) {
struct tcphdr *tcp = tcp_hdr(skb);
key->ipv6.tp.src = tcp->source;
key->ipv6.tp.dst = tcp->dest;
key->ipv6.tp.flags = TCP_FLAGS_BE16(tcp);
key->tp.src = tcp->source;
key->tp.dst = tcp->dest;
key->tp.flags = TCP_FLAGS_BE16(tcp);
}
} else if (key->ip.proto == NEXTHDR_UDP) {
if (udphdr_ok(skb)) {
struct udphdr *udp = udp_hdr(skb);
key->ipv6.tp.src = udp->source;
key->ipv6.tp.dst = udp->dest;
key->tp.src = udp->source;
key->tp.dst = udp->dest;
}
} else if (key->ip.proto == NEXTHDR_SCTP) {
if (sctphdr_ok(skb)) {
struct sctphdr *sctp = sctp_hdr(skb);
key->ipv6.tp.src = sctp->source;
key->ipv6.tp.dst = sctp->dest;
key->tp.src = sctp->source;
key->tp.dst = sctp->dest;
}
} else if (key->ip.proto == NEXTHDR_ICMP) {
if (icmp6hdr_ok(skb)) {