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net: Add trace events for all receive entry points, exposing more skb fields

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The existing net/netif_rx and net/netif_receive_skb trace events
provide little information about the skb, nor do they indicate how it
entered the stack.

Add trace events at entry of each of the exported functions, including
most fields that are likely to be interesting for debugging driver
datapath behaviour.  Split netif_rx() and netif_receive_skb() so that
internal calls are not traced.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings
2014-01-10 22:17:24 +00:00
committed by David S. Miller
parent d87d04a785
commit ae78dbfa40
2 changed files with 161 additions and 39 deletions
Download Patch File Download Diff File Expand all files Collapse all files

100
include/trace/events/net.h
View File

@@ -136,6 +136,106 @@ DEFINE_EVENT(net_dev_template, netif_rx,
TP_ARGS(skb)
);
DECLARE_EVENT_CLASS(net_dev_rx_verbose_template,
TP_PROTO(const struct sk_buff *skb),
TP_ARGS(skb),
TP_STRUCT__entry(
__string( name, skb->dev->name )
__field( unsigned int, napi_id )
__field( u16, queue_mapping )
__field( const void *, skbaddr )
__field( bool, vlan_tagged )
__field( u16, vlan_proto )
__field( u16, vlan_tci )
__field( u16, protocol )
__field( u8, ip_summed )
__field( u32, rxhash )
__field( bool, l4_rxhash )
__field( unsigned int, len )
__field( unsigned int, data_len )
__field( unsigned int, truesize )
__field( bool, mac_header_valid)
__field( int, mac_header )
__field( unsigned char, nr_frags )
__field( u16, gso_size )
__field( u16, gso_type )
),
TP_fast_assign(
__assign_str(name, skb->dev->name);
#ifdef CONFIG_NET_RX_BUSY_POLL
__entry->napi_id = skb->napi_id;
#else
__entry->napi_id = 0;
#endif
__entry->queue_mapping = skb->queue_mapping;
__entry->skbaddr = skb;
__entry->vlan_tagged = vlan_tx_tag_present(skb);
__entry->vlan_proto = ntohs(skb->vlan_proto);
__entry->vlan_tci = vlan_tx_tag_get(skb);
__entry->protocol = ntohs(skb->protocol);
__entry->ip_summed = skb->ip_summed;
__entry->rxhash = skb->rxhash;
__entry->l4_rxhash = skb->l4_rxhash;
__entry->len = skb->len;
__entry->data_len = skb->data_len;
__entry->truesize = skb->truesize;
__entry->mac_header_valid = skb_mac_header_was_set(skb);
__entry->mac_header = skb_mac_header(skb) - skb->data;
__entry->nr_frags = skb_shinfo(skb)->nr_frags;
__entry->gso_size = skb_shinfo(skb)->gso_size;
__entry->gso_type = skb_shinfo(skb)->gso_type;
),
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 rxhash=0x%08x l4_rxhash=%d len=%u data_len=%u truesize=%u mac_header_valid=%d mac_header=%d nr_frags=%d gso_size=%d gso_type=%#x",
__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->rxhash, __entry->l4_rxhash, __entry->len,
__entry->data_len, __entry->truesize,
__entry->mac_header_valid, __entry->mac_header,
__entry->nr_frags, __entry->gso_size, __entry->gso_type)
);
DEFINE_EVENT(net_dev_rx_verbose_template, napi_gro_frags_entry,
TP_PROTO(const struct sk_buff *skb),
TP_ARGS(skb)
);
DEFINE_EVENT(net_dev_rx_verbose_template, napi_gro_receive_entry,
TP_PROTO(const struct sk_buff *skb),
TP_ARGS(skb)
);
DEFINE_EVENT(net_dev_rx_verbose_template, netif_receive_skb_entry,
TP_PROTO(const struct sk_buff *skb),
TP_ARGS(skb)
);
DEFINE_EVENT(net_dev_rx_verbose_template, netif_rx_entry,
TP_PROTO(const struct sk_buff *skb),
TP_ARGS(skb)
);
DEFINE_EVENT(net_dev_rx_verbose_template, netif_rx_ni_entry,
TP_PROTO(const struct sk_buff *skb),
TP_ARGS(skb)
);
#endif /* _TRACE_NET_H */
/* This part must be outside protection */