@@ -13,6 +13,7 @@ openvswitch-y := \
flow_netlink.o \
flow_table.o \
meter.o \
+ openvswitch_trace.o \
vport.o \
vport-internal_dev.o \
vport-netdev.o
@@ -24,3 +25,5 @@ endif
obj-$(CONFIG_OPENVSWITCH_VXLAN)+= vport-vxlan.o
obj-$(CONFIG_OPENVSWITCH_GENEVE)+= vport-geneve.o
obj-$(CONFIG_OPENVSWITCH_GRE) += vport-gre.o
+
+CFLAGS_openvswitch_trace.o = -I$(src)
@@ -30,6 +30,7 @@
#include "conntrack.h"
#include "vport.h"
#include "flow_netlink.h"
+#include "openvswitch_trace.h"
struct deferred_action {
struct sk_buff *skb;
@@ -1242,6 +1243,9 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
a = nla_next(a, &rem)) {
int err = 0;
+ if (trace_ovs_do_execute_action_enabled())
+ trace_ovs_do_execute_action(dp, skb, key, a, rem);
+
switch (nla_type(a)) {
case OVS_ACTION_ATTR_OUTPUT: {
int port = nla_get_u32(a);
@@ -43,6 +43,7 @@
#include "flow_table.h"
#include "flow_netlink.h"
#include "meter.h"
+#include "openvswitch_trace.h"
#include "vport-internal_dev.h"
#include "vport-netdev.h"
@@ -275,6 +276,9 @@ int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
struct dp_stats_percpu *stats;
int err;
+ if (trace_ovs_dp_upcall_enabled())
+ trace_ovs_dp_upcall(dp, skb, key, upcall_info);
+
if (upcall_info->portid == 0) {
err = -ENOTCONN;
goto err;
new file mode 100644
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
+/* bug in tracepoint.h, it should include this */
+#include <linux/module.h>
+
+/* sparse isn't too happy with all macros... */
+#ifndef __CHECKER__
+#define CREATE_TRACE_POINTS
+#include "openvswitch_trace.h"
+
+#endif
new file mode 100644
@@ -0,0 +1,158 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM openvswitch
+
+#if !defined(_TRACE_OPENVSWITCH_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_OPENVSWITCH_H
+
+#include <linux/tracepoint.h>
+
+#include "datapath.h"
+
+TRACE_EVENT(ovs_do_execute_action,
+
+ TP_PROTO(struct datapath *dp, struct sk_buff *skb,
+ struct sw_flow_key *key, const struct nlattr *a, int rem),
+
+ TP_ARGS(dp, skb, key, a, rem),
+
+ TP_STRUCT__entry(
+ __field( void *, dpaddr )
+ __string( dp_name, ovs_dp_name(dp) )
+ __string( dev_name, skb->dev->name )
+ __field( void *, skbaddr )
+ __field( unsigned int, len )
+ __field( unsigned int, data_len )
+ __field( unsigned int, truesize )
+ __field( u8, nr_frags )
+ __field( u16, gso_size )
+ __field( u16, gso_type )
+ __field( u32, ovs_flow_hash )
+ __field( u32, recirc_id )
+ __field( void *, keyaddr )
+ __field( u16, key_eth_type )
+ __field( u8, key_ct_state )
+ __field( u8, key_ct_orig_proto )
+ __field( u16, key_ct_zone )
+ __field( unsigned int, flow_key_valid )
+ __field( u8, action_type )
+ __field( unsigned int, action_len )
+ __field( void *, action_data )
+ __field( u8, is_last )
+ ),
+
+ TP_fast_assign(
+ __entry->dpaddr = dp;
+ __assign_str(dp_name, ovs_dp_name(dp));
+ __assign_str(dev_name, skb->dev->name);
+ __entry->skbaddr = skb;
+ __entry->len = skb->len;
+ __entry->data_len = skb->data_len;
+ __entry->truesize = skb->truesize;
+ __entry->nr_frags = skb_shinfo(skb)->nr_frags;
+ __entry->gso_size = skb_shinfo(skb)->gso_size;
+ __entry->gso_type = skb_shinfo(skb)->gso_type;
+ __entry->ovs_flow_hash = key->ovs_flow_hash;
+ __entry->recirc_id = key->recirc_id;
+ __entry->keyaddr = key;
+ __entry->key_eth_type = key->eth.type;
+ __entry->key_ct_state = key->ct_state;
+ __entry->key_ct_orig_proto = key->ct_orig_proto;
+ __entry->key_ct_zone = key->ct_zone;
+ __entry->flow_key_valid = !(key->mac_proto & SW_FLOW_KEY_INVALID);
+ __entry->action_type = nla_type(a);
+ __entry->action_len = nla_len(a);
+ __entry->action_data = nla_data(a);
+ __entry->is_last = nla_is_last(a, rem);
+ ),
+
+ TP_printk("dpaddr=%p dp_name=%s dev=%s skbaddr=%p len=%u data_len=%u truesize=%u nr_frags=%d gso_size=%d gso_type=%#x ovs_flow_hash=0x%08x recirc_id=0x%08x keyaddr=%p eth_type=0x%04x ct_state=%02x ct_orig_proto=%02x ct_Zone=%04x flow_key_valid=%d action_type=%u action_len=%u action_data=%p is_last=%d",
+ __entry->dpaddr, __get_str(dp_name), __get_str(dev_name),
+ __entry->skbaddr, __entry->len, __entry->data_len,
+ __entry->truesize, __entry->nr_frags, __entry->gso_size,
+ __entry->gso_type, __entry->ovs_flow_hash,
+ __entry->recirc_id, __entry->keyaddr, __entry->key_eth_type,
+ __entry->key_ct_state, __entry->key_ct_orig_proto,
+ __entry->key_ct_zone,
+ __entry->flow_key_valid,
+ __entry->action_type, __entry->action_len,
+ __entry->action_data, __entry->is_last)
+);
+
+TRACE_EVENT(ovs_dp_upcall,
+
+ TP_PROTO(struct datapath *dp, struct sk_buff *skb,
+ const struct sw_flow_key *key,
+ const struct dp_upcall_info *upcall_info),
+
+ TP_ARGS(dp, skb, key, upcall_info),
+
+ TP_STRUCT__entry(
+ __field( void *, dpaddr )
+ __string( dp_name, ovs_dp_name(dp) )
+ __string( dev_name, skb->dev->name )
+ __field( void *, skbaddr )
+ __field( unsigned int, len )
+ __field( unsigned int, data_len )
+ __field( unsigned int, truesize )
+ __field( u8, nr_frags )
+ __field( u16, gso_size )
+ __field( u16, gso_type )
+ __field( u32, ovs_flow_hash )
+ __field( u32, recirc_id )
+ __field( const void *, keyaddr )
+ __field( u16, key_eth_type )
+ __field( u8, key_ct_state )
+ __field( u8, key_ct_orig_proto )
+ __field( u16, key_ct_zone )
+ __field( unsigned int, flow_key_valid )
+ __field( u8, upcall_cmd )
+ __field( u32, upcall_port )
+ __field( u16, upcall_mru )
+ ),
+
+ TP_fast_assign(
+ __entry->dpaddr = dp;
+ __assign_str(dp_name, ovs_dp_name(dp));
+ __assign_str(dev_name, skb->dev->name);
+ __entry->skbaddr = skb;
+ __entry->len = skb->len;
+ __entry->data_len = skb->data_len;
+ __entry->truesize = skb->truesize;
+ __entry->nr_frags = skb_shinfo(skb)->nr_frags;
+ __entry->gso_size = skb_shinfo(skb)->gso_size;
+ __entry->gso_type = skb_shinfo(skb)->gso_type;
+ __entry->ovs_flow_hash = key->ovs_flow_hash;
+ __entry->recirc_id = key->recirc_id;
+ __entry->keyaddr = key;
+ __entry->key_eth_type = key->eth.type;
+ __entry->key_ct_state = key->ct_state;
+ __entry->key_ct_orig_proto = key->ct_orig_proto;
+ __entry->key_ct_zone = key->ct_zone;
+ __entry->flow_key_valid = !(key->mac_proto & SW_FLOW_KEY_INVALID);
+ __entry->upcall_cmd = upcall_info->cmd;
+ __entry->upcall_port = upcall_info->portid;
+ __entry->upcall_mru = upcall_info->mru;
+ ),
+
+ TP_printk("dpaddr=%p dp_name=%s dev=%s skbaddr=%p len=%u data_len=%u truesize=%u nr_frags=%d gso_size=%d gso_type=%#x ovs_flow_hash=0x%08x recirc_id=0x%08x keyaddr=%p eth_type=0x%04x ct_state=%02x ct_orig_proto=%02x ct_zone=%04x flow_key_valid=%d upcall_cmd=%u upcall_port=%u upcall_mru=%u",
+ __entry->dpaddr, __get_str(dp_name), __get_str(dev_name),
+ __entry->skbaddr, __entry->len, __entry->data_len,
+ __entry->truesize, __entry->nr_frags, __entry->gso_size,
+ __entry->gso_type, __entry->ovs_flow_hash,
+ __entry->recirc_id, __entry->keyaddr, __entry->key_eth_type,
+ __entry->key_ct_state, __entry->key_ct_orig_proto,
+ __entry->key_ct_zone,
+ __entry->flow_key_valid,
+ __entry->upcall_cmd, __entry->upcall_port,
+ __entry->upcall_mru)
+);
+
+#endif /* _TRACE_OPENVSWITCH_H */
+
+/* This part must be outside protection */
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE openvswitch_trace
+#include <trace/define_trace.h>
This makes openvswitch module use the event tracing framework to log the upcall interface and action execution pipeline. When using openvswitch as the packet forwarding engine, some types of debugging are made possible simply by using the ovs-vswitchd's ofproto/trace command. However, such a command has some limitations: 1. When trying to trace packets that go through the CT action, the state of the packet can't be determined, and probably would be potentially wrong. 2. Deducing problem packets can sometimes be difficult as well even if many of the flows are known 3. It's possible to use the openvswitch module even without the ovs-vswitchd (although, not common use). Introduce the event tracing points here to make it possible for working through these problems in kernel space. The style is copied from the mac80211 driver-trace / trace code for consistency - this creates some checkpatch splats, but the official 'guide' for adding tracepoints, as well as the existing examples all add the same splats so it seems acceptable. Signed-off-by: Aaron Conole <aconole@redhat.com> --- RFC: https://lore.kernel.org/netdev/20210527191532.376414-1-aconole@redhat.com/ - renamed trace point functions - added fields to the trace point argument net/openvswitch/Makefile | 3 + net/openvswitch/actions.c | 4 + net/openvswitch/datapath.c | 4 + net/openvswitch/openvswitch_trace.c | 10 ++ net/openvswitch/openvswitch_trace.h | 158 ++++++++++++++++++++++++++++ 5 files changed, 179 insertions(+) create mode 100644 net/openvswitch/openvswitch_trace.c create mode 100644 net/openvswitch/openvswitch_trace.h