openvswitch: Per cpu flow stats.
With mega flow implementation ovs flow can be shared between
multiple CPUs which makes stats updates highly contended
operation. This patch uses per-CPU stats in cases where a flow
is likely to be shared (if there is a wildcard in the 5-tuple
and therefore likely to be spread by RSS). In other situations,
it uses the current strategy, saving memory and allocation time.
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
index 2bc1bc1a..3ccb92f 100644
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -266,6 +266,20 @@
return true;
}
+static bool is_all_set(const u8 *fp, size_t size)
+{
+ int i;
+
+ if (!fp)
+ return false;
+
+ for (i = 0; i < size; i++)
+ if (fp[i] != 0xff)
+ return false;
+
+ return true;
+}
+
static int __parse_flow_nlattrs(const struct nlattr *attr,
const struct nlattr *a[],
u64 *attrsp, bool nz)
@@ -487,8 +501,9 @@
return 0;
}
-static int ovs_key_from_nlattrs(struct sw_flow_match *match, u64 attrs,
- const struct nlattr **a, bool is_mask)
+static int ovs_key_from_nlattrs(struct sw_flow_match *match, bool *exact_5tuple,
+ u64 attrs, const struct nlattr **a,
+ bool is_mask)
{
int err;
u64 orig_attrs = attrs;
@@ -545,6 +560,11 @@
SW_FLOW_KEY_PUT(match, eth.type, htons(ETH_P_802_2), is_mask);
}
+ if (is_mask && exact_5tuple) {
+ if (match->mask->key.eth.type != htons(0xffff))
+ *exact_5tuple = false;
+ }
+
if (attrs & (1 << OVS_KEY_ATTR_IPV4)) {
const struct ovs_key_ipv4 *ipv4_key;
@@ -567,6 +587,13 @@
SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
ipv4_key->ipv4_dst, is_mask);
attrs &= ~(1 << OVS_KEY_ATTR_IPV4);
+
+ if (is_mask && exact_5tuple && *exact_5tuple) {
+ if (ipv4_key->ipv4_proto != 0xff ||
+ ipv4_key->ipv4_src != htonl(0xffffffff) ||
+ ipv4_key->ipv4_dst != htonl(0xffffffff))
+ *exact_5tuple = false;
+ }
}
if (attrs & (1 << OVS_KEY_ATTR_IPV6)) {
@@ -598,6 +625,13 @@
is_mask);
attrs &= ~(1 << OVS_KEY_ATTR_IPV6);
+
+ if (is_mask && exact_5tuple && *exact_5tuple) {
+ if (ipv6_key->ipv6_proto != 0xff ||
+ !is_all_set((u8 *)ipv6_key->ipv6_src, sizeof(match->key->ipv6.addr.src)) ||
+ !is_all_set((u8 *)ipv6_key->ipv6_dst, sizeof(match->key->ipv6.addr.dst)))
+ *exact_5tuple = false;
+ }
}
if (attrs & (1 << OVS_KEY_ATTR_ARP)) {
@@ -640,6 +674,11 @@
tcp_key->tcp_dst, is_mask);
}
attrs &= ~(1 << OVS_KEY_ATTR_TCP);
+
+ if (is_mask && exact_5tuple && *exact_5tuple &&
+ (tcp_key->tcp_src != htons(0xffff) ||
+ tcp_key->tcp_dst != htons(0xffff)))
+ *exact_5tuple = false;
}
if (attrs & (1 << OVS_KEY_ATTR_TCP_FLAGS)) {
@@ -671,6 +710,11 @@
udp_key->udp_dst, is_mask);
}
attrs &= ~(1 << OVS_KEY_ATTR_UDP);
+
+ if (is_mask && exact_5tuple && *exact_5tuple &&
+ (udp_key->udp_src != htons(0xffff) ||
+ udp_key->udp_dst != htons(0xffff)))
+ *exact_5tuple = false;
}
if (attrs & (1 << OVS_KEY_ATTR_SCTP)) {
@@ -756,6 +800,7 @@
* attribute specifies the mask field of the wildcarded flow.
*/
int ovs_nla_get_match(struct sw_flow_match *match,
+ bool *exact_5tuple,
const struct nlattr *key,
const struct nlattr *mask)
{
@@ -803,10 +848,13 @@
}
}
- err = ovs_key_from_nlattrs(match, key_attrs, a, false);
+ err = ovs_key_from_nlattrs(match, NULL, key_attrs, a, false);
if (err)
return err;
+ if (exact_5tuple)
+ *exact_5tuple = true;
+
if (mask) {
err = parse_flow_mask_nlattrs(mask, a, &mask_attrs);
if (err)
@@ -844,7 +892,7 @@
}
}
- err = ovs_key_from_nlattrs(match, mask_attrs, a, true);
+ err = ovs_key_from_nlattrs(match, exact_5tuple, mask_attrs, a, true);
if (err)
return err;
} else {