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Date: Mon, 5 Jan 2015 11:10:34 +0900
From: Simon Horman <simon.horman@...ronome.com>
To: "Arad, Ronen" <ronen.arad@...el.com>
Cc: "Fastabend, John R" <john.r.fastabend@...el.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH/RFC flow-net-next 04/10] net: flow: Add counters to flows
On Mon, Dec 29, 2014 at 07:31:41AM +0000, Arad, Ronen wrote:
>
>
> >-----Original Message-----
> >From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org] On
> >Behalf Of Simon Horman
> >Sent: Monday, December 29, 2014 4:16 AM
> >To: Fastabend, John R; netdev@...r.kernel.org
> >Cc: Simon Horman
> >Subject: [PATCH/RFC flow-net-next 04/10] net: flow: Add counters to flows
> >
> >It may be useful for hardware flow table support for counters to be exposed
> >via the flow API. One possible use case of this is for Open vSwitch to use
> >the flow API in conjunction with its existing datapath flow management
> >scheme which in a nutshell treats the datapath as a cache that times out
> >idle entries.
> >
> >This patch exposes optionally exposes three counters:
> >- Number of packets that have matched a flow
> >- Number of bytes of packets that have matched a flow
> >- The time in ms when the flow was last hit
> >
> >Inspired by the flow counters present in Open Flow.
> >
> >Signed-off-by: Simon Horman <simon.horman@...ronome.com>
> >
> >---
> >
> >Compile tested only
> >---
> > include/uapi/linux/if_flow.h | 24 ++++++++++++++++++++++++
> > net/core/flow_table.c | 27 +++++++++++++++++++++++++++
> > 2 files changed, 51 insertions(+)
> >
> >diff --git a/include/uapi/linux/if_flow.h b/include/uapi/linux/if_flow.h
> >index 28da45b..18214ea 100644
> >--- a/include/uapi/linux/if_flow.h
> >+++ b/include/uapi/linux/if_flow.h
> >@@ -127,6 +127,9 @@
> > * [NET_FLOW_ATTR_PRIORITY]
> > * [NET_FLOW_ATTR_IDLE_TIMEOUT]
> > * [NET_FLOW_ATTR_HARD_TIMEOUT]
> >+ * [NET_FLOW_ATTR_BYTE_COUNT]
> >+ * [NET_FLOW_ATTR_PACKET_COUNT]
> >+ * [NET_FLOW_ATTR_LAST_USED]
> > * [NET_FLOW_ATTR_MATCHES]
> > * [NET_FLOW_FIELD_REF]
> > * [NET_FLOW_FIELD_REF]
> >@@ -153,6 +156,9 @@
> > * [NET_FLOW_ATTR_PRIORITY]
> > * [NET_FLOW_ATTR_IDLE_TIMEOUT]
> > * [NET_FLOW_ATTR_HARD_TIMEOUT]
> >+ * [NET_FLOW_ATTR_BYTE_COUNT]
> >+ * [NET_FLOW_ATTR_PACKET_COUNT]
> >+ * [NET_FLOW_ATTR_LAST_USED]
> > * [NET_FLOW_MATCHES]
> > * [NET_FLOW_FIELD_REF]
> > * [NET_FLOW_FIELD_REF]
> >@@ -365,6 +371,9 @@ enum {
> > * @idle_timeout idle timeout of flow in seconds. Zero for no timeout.
> > * @hard_timeout timeout of flow regardless of use in seconds.
> > * Zero for no timeout.
> >+ * @byte_count bytes recieved
> >+ * @byte_count packets recieved
> >+ * @last_used time of most recent use (msec since system initialisation)
> > *
> > * Flows must match all entries in match set.
> > */
> >@@ -374,6 +383,9 @@ struct net_flow_flow {
> > int priority;
> > __u32 idle_timeout;
> > __u32 hard_timeout;
> >+ __u64 byte_count;
> >+ __u64 packet_count;
> >+ __u64 last_used;
> > struct net_flow_field_ref *matches;
> > struct net_flow_action *actions;
> > };
> >@@ -414,6 +426,9 @@ enum {
> > NET_FLOW_ATTR_ACTIONS,
> > NET_FLOW_ATTR_IDLE_TIMEOUT,
> > NET_FLOW_ATTR_HARD_TIMEOUT,
> >+ NET_FLOW_ATTR_BYTE_COUNT,
> >+ NET_FLOW_ATTR_PACKET_COUNT,
> >+ NET_FLOW_ATTR_LAST_USED,
> > __NET_FLOW_ATTR_MAX,
> > };
> > #define NET_FLOW_ATTR_MAX (__NET_FLOW_ATTR_MAX - 1)
> >@@ -465,6 +480,15 @@ enum {
> >
> > /* Table supports idle timeout of flows */
> > NET_FLOW_TABLE_F_HARD_TIMEOUT = (1 << 1),
> >+
> >+ /* Table supports byte counter for flows */
> >+ NET_FLOW_TABLE_F_BYTE_COUNT = (1 << 2),
> >+
> >+ /* Table supports packet counter for flows */
> >+ NET_FLOW_TABLE_F_PACKET_COUNT = (1 << 3),
> >+
> >+ /* Table supports last used counter for flows */
> >+ NET_FLOW_TABLE_F_PACKET_LAST_USED = (1 << 4),
> > };
> >
> > #if 0
> >diff --git a/net/core/flow_table.c b/net/core/flow_table.c
> >index 89ba9bc..070e646 100644
> >--- a/net/core/flow_table.c
> >+++ b/net/core/flow_table.c
> >@@ -54,6 +54,9 @@ struct nla_policy net_flow_flow_policy[NET_FLOW_ATTR_MAX +
> >1] = {
> > [NET_FLOW_ATTR_PRIORITY] = { .type = NLA_U32 },
> > [NET_FLOW_ATTR_IDLE_TIMEOUT] = { .type = NLA_U32 },
> > [NET_FLOW_ATTR_HARD_TIMEOUT] = { .type = NLA_U32 },
> >+ [NET_FLOW_ATTR_BYTE_COUNT] = { .type = NLA_U64 },
> >+ [NET_FLOW_ATTR_PACKET_COUNT] = { .type = NLA_U64 },
> >+ [NET_FLOW_ATTR_LAST_USED] = { .type = NLA_U64 },
> > [NET_FLOW_ATTR_MATCHES] = { .type = NLA_NESTED },
> > [NET_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
> > };
> >@@ -206,6 +209,16 @@ int net_flow_put_flow(struct sk_buff *skb, struct
> >net_flow_flow *flow)
> > nla_put_u32(skb, NET_FLOW_ATTR_HARD_TIMEOUT, flow->hard_timeout))
> > goto flows_put_failure;
> >
> >+ if (flow->byte_count &&
> >+ nla_put_u32(skb, NET_FLOW_ATTR_BYTE_COUNT, flow->byte_count))
> >+ goto flows_put_failure;
> >+ if (flow->packet_count &&
> >+ nla_put_u32(skb, NET_FLOW_ATTR_PACKET_COUNT, flow->packet_count))
> >+ goto flows_put_failure;
> >+ if (flow->last_used &&
> >+ nla_put_u32(skb, NET_FLOW_ATTR_LAST_USED, flow->last_used))
> >+ goto flows_put_failure;
> >+
> The flow byte_count, packet_count, and last_used fields are defined as __u64 and related netlink attributes are of type NLA_U64 but nla_put_u32() is used to add them to the netlink msg.
Thanks, I will fix that up by using nla_put_u64().
> > matches = nla_nest_start(skb, NET_FLOW_ATTR_MATCHES);
> > if (!matches)
> > goto flows_put_failure;
> >@@ -536,6 +549,13 @@ static int net_flow_get_flow(struct net_flow_flow *flow,
> >struct nlattr *attr)
> > if (f[NET_FLOW_ATTR_HARD_TIMEOUT])
> > flow->hard_timeout = nla_get_u32(f[NET_FLOW_ATTR_HARD_TIMEOUT]);
> >
> >+ if (f[NET_FLOW_ATTR_BYTE_COUNT])
> >+ flow->byte_count = nla_get_u64(f[NET_FLOW_ATTR_BYTE_COUNT]);
> >+ if (f[NET_FLOW_ATTR_PACKET_COUNT])
> >+ flow->packet_count = nla_get_u64(f[NET_FLOW_ATTR_PACKET_COUNT]);
> >+ if (f[NET_FLOW_ATTR_LAST_USED])
> >+ flow->last_used = nla_get_u64(f[NET_FLOW_ATTR_LAST_USED]);
> >+
> > flow->matches = NULL;
> > flow->actions = NULL;
> >
> >@@ -1386,6 +1406,13 @@ static int net_flow_table_cmd_flows(struct sk_buff
> >*recv_skb,
> > if (this.hard_timeout)
> > used_features |= NET_FLOW_TABLE_F_HARD_TIMEOUT;
> >
> >+ if (this.byte_count)
> >+ used_features |= NET_FLOW_TABLE_F_BYTE_COUNT;
> >+ if (this.packet_count)
> >+ used_features |= NET_FLOW_TABLE_F_PACKET_COUNT;
> >+ if (this.last_used)
> >+ used_features |= NET_FLOW_TABLE_F_PACKET_LAST_USED;
> >+
> > err = net_flow_table_check_features(dev, this.table_id,
> > used_features);
> > if (err)
> >--
> >2.1.3
> >
> >--
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