net: add net cookie for net device trace events

In a multi-network card or container environment, this is needed in order
to differentiate between trace events relating to net devices that exist
in different network namespaces and share the same name.

for xmit_timeout trace events:
[002] ..s1.  1838.311662: net_dev_xmit_timeout: dev=eth0 driver=virtio_net queue=10 net_cookie=3
[007] ..s1.  1839.335650: net_dev_xmit_timeout: dev=eth0 driver=virtio_net queue=10 net_cookie=4100
[007] ..s1.  1844.455659: net_dev_xmit_timeout: dev=eth0 driver=virtio_net queue=10 net_cookie=3
[002] ..s1.  1850.087647: net_dev_xmit_timeout: dev=eth0 driver=virtio_net queue=10 net_cookie=3

Cc: Eran Ben Elisha <eranbe@mellanox.com>
Cc: Jiri Pirko <jiri@mellanox.com>
Cc: Cong Wang <xiyou.wangcong@gmail.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Simon Horman <horms@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Suggested-by: Ido Schimmel <idosch@idosch.org>
Signed-off-by: Tonghao Zhang <tonghao@bamaicloud.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: NipaLocal <nipa@local>

Author: hao022

include/trace/events/net.h

@@ -35,6 +35,7 @@ TRACE_EVENT(net_dev_start_xmit,
 		__field(	u16,			gso_size	)
 		__field(	u16,			gso_segs	)
 		__field(	u16,			gso_type	)
+		__field(	u64,			net_cookie	)
 	),
 
 	TP_fast_assign(
@@ -57,16 +58,18 @@ TRACE_EVENT(net_dev_start_xmit,
 		__entry->gso_size = skb_shinfo(skb)->gso_size;
 		__entry->gso_segs = skb_shinfo(skb)->gso_segs;
 		__entry->gso_type = skb_shinfo(skb)->gso_type;
+		__entry->net_cookie = dev_net(dev)->net_cookie;
 	),
 
-	TP_printk("dev=%s queue_mapping=%u skbaddr=%p vlan_tagged=%d vlan_proto=0x%04x vlan_tci=0x%04x protocol=0x%04x ip_summed=%d len=%u data_len=%u network_offset=%d transport_offset_valid=%d transport_offset=%d tx_flags=%d gso_size=%d gso_segs=%d gso_type=%#x",
+	TP_printk("dev=%s queue_mapping=%u skbaddr=%p vlan_tagged=%d vlan_proto=0x%04x vlan_tci=0x%04x protocol=0x%04x ip_summed=%d len=%u data_len=%u network_offset=%d transport_offset_valid=%d transport_offset=%d tx_flags=%d gso_size=%d gso_segs=%d gso_type=%#x net_cookie=%llu",
 		  __get_str(name), __entry->queue_mapping, __entry->skbaddr,
 		  __entry->vlan_tagged, __entry->vlan_proto, __entry->vlan_tci,
 		  __entry->protocol, __entry->ip_summed, __entry->len,
 		  __entry->data_len,
 		  __entry->network_offset, __entry->transport_offset_valid,
 		  __entry->transport_offset, __entry->tx_flags,
-		  __entry->gso_size, __entry->gso_segs, __entry->gso_type)
+		  __entry->gso_size, __entry->gso_segs,
+		  __entry->gso_type, __entry->net_cookie)
 );
 
 TRACE_EVENT(net_dev_xmit,
@@ -83,17 +86,21 @@ TRACE_EVENT(net_dev_xmit,
 		__field(	unsigned int,	len		)
 		__field(	int,		rc		)
 		__string(	name,		dev->name	)
+		__field(	u64,		net_cookie	)
 	),
 
 	TP_fast_assign(
 		__entry->skbaddr = skb;
 		__entry->len = skb_len;
 		__entry->rc = rc;
+		__entry->net_cookie = dev_net(dev)->net_cookie;
 		__assign_str(name);
 	),
 
-	TP_printk("dev=%s skbaddr=%p len=%u rc=%d",
-		__get_str(name), __entry->skbaddr, __entry->len, __entry->rc)
+	TP_printk("dev=%s skbaddr=%p len=%u rc=%d net_cookie=%llu",
+		__get_str(name), __entry->skbaddr,
+		__entry->len, __entry->rc,
+		__entry->net_cookie)
 );
 
 TRACE_EVENT(net_dev_xmit_timeout,
@@ -107,16 +114,19 @@ TRACE_EVENT(net_dev_xmit_timeout,
 		__string(	name,		dev->name	)
 		__string(	driver,		netdev_drivername(dev))
 		__field(	int,		queue_index	)
+		__field(	u64,		net_cookie	)
 	),
 
 	TP_fast_assign(
 		__assign_str(name);
 		__assign_str(driver);
 		__entry->queue_index = queue_index;
+		__entry->net_cookie = dev_net(dev)->net_cookie;
 	),
 
-	TP_printk("dev=%s driver=%s queue=%d",
-		__get_str(name), __get_str(driver), __entry->queue_index)
+	TP_printk("dev=%s driver=%s queue=%d net_cookie=%llu",
+		__get_str(name), __get_str(driver),
+		__entry->queue_index, __entry->net_cookie)
 );
 
 DECLARE_EVENT_CLASS(net_dev_template,
@@ -129,16 +139,20 @@ DECLARE_EVENT_CLASS(net_dev_template,
 		__field(	void *,		skbaddr		)
 		__field(	unsigned int,	len		)
 		__string(	name,		skb->dev->name	)
+		__field(	u64,		net_cookie	)
 	),
 
 	TP_fast_assign(
 		__entry->skbaddr = skb;
 		__entry->len = skb->len;
+		__entry->net_cookie = dev_net(skb->dev)->net_cookie;
 		__assign_str(name);
 	),
 
-	TP_printk("dev=%s skbaddr=%p len=%u",
-		__get_str(name), __entry->skbaddr, __entry->len)
+	TP_printk("dev=%s skbaddr=%p len=%u net_cookie=%llu",
+		__get_str(name), __entry->skbaddr,
+		__entry->len,
+		__entry->net_cookie)
 )
 
 DEFINE_EVENT(net_dev_template, net_dev_queue,
@@ -188,6 +202,7 @@ DECLARE_EVENT_CLASS(net_dev_rx_verbose_template,
 		__field(	unsigned char,		nr_frags	)
 		__field(	u16,			gso_size	)
 		__field(	u16,			gso_type	)
+		__field(	u64,			net_cookie	)
 	),
 
 	TP_fast_assign(
@@ -214,16 +229,18 @@ DECLARE_EVENT_CLASS(net_dev_rx_verbose_template,
 		__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->net_cookie = dev_net(skb->dev)->net_cookie;
 	),
 
-	TP_printk("dev=%s napi_id=%#x queue_mapping=%u skbaddr=%p vlan_tagged=%d vlan_proto=0x%04x vlan_tci=0x%04x protocol=0x%04x ip_summed=%d hash=0x%08x l4_hash=%d len=%u data_len=%u truesize=%u mac_header_valid=%d mac_header=%d nr_frags=%d gso_size=%d gso_type=%#x",
+	TP_printk("dev=%s napi_id=%#x queue_mapping=%u skbaddr=%p vlan_tagged=%d vlan_proto=0x%04x vlan_tci=0x%04x protocol=0x%04x ip_summed=%d hash=0x%08x l4_hash=%d len=%u data_len=%u truesize=%u mac_header_valid=%d mac_header=%d nr_frags=%d gso_size=%d gso_type=%#x net_cookie=%llu",
 		  __get_str(name), __entry->napi_id, __entry->queue_mapping,
 		  __entry->skbaddr, __entry->vlan_tagged, __entry->vlan_proto,
 		  __entry->vlan_tci, __entry->protocol, __entry->ip_summed,
 		  __entry->hash, __entry->l4_hash, __entry->len,
 		  __entry->data_len, __entry->truesize,
 		  __entry->mac_header_valid, __entry->mac_header,
-		  __entry->nr_frags, __entry->gso_size, __entry->gso_type)
+		  __entry->nr_frags, __entry->gso_size,
+		  __entry->gso_type, __entry->net_cookie)
 );
 
 DEFINE_EVENT(net_dev_rx_verbose_template, napi_gro_frags_entry,