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Date: Wed, 20 Jan 2010 10:03:12 +0900
From: Koki Sanagi <sanagi.koki@...fujitsu.com>
To: Yang Hongyang <yanghy@...fujitsu.com>
CC: netdev@...r.kernel.org, davem@...emloft.net, nhorman@...driver.com,
izumi.taku@...fujitsu.com, kaneshige.kenji@...fujitsu.com
Subject: Re: [PATCH 2/5] tracing/events: add tracepoint to IP protocol
Thanks for your reply.
(2010/01/19 16:23), Yang Hongyang wrote:
> Yang Hongyang wrote:
>> Koki Sanagi wrote:
>>> This patch adds tracepoints at IP protocol, skb_clone and locations where
>>> copy user data to skb.
>>>
>>> skb_clone chase the cloned skb
>>> senddata_copy_skb copy userdata to skb for transmit
>>> ip_queue_xmit entry of IP layer(TCP transmit)
>>> ip_push_pending_frames entry of IP layer(UDP transmit)
>>> ip_output entry of IP layer(RAW transmit)
>>> ip_frag_queue aggregate fragmented packet
>>> ip_frag_reasm reasemble fragmented packet
>>> ip_rcv entry of IP layer(receive)
>>>
>>> Signed-off-by: Koki Sanagi<sanagi.koki@...fujitsu.com>
>>> ---
>>> include/trace/events/skb.h | 188 ++++++++++++++++++++++++++++++++++++++++++++
>>> net/core/skbuff.c | 1 +
>>> net/ipv4/ip_fragment.c | 3 +
>>> net/ipv4/ip_input.c | 3 +
>>> net/ipv4/ip_output.c | 11 +++
>>> 5 files changed, 206 insertions(+), 0 deletions(-)
>>>
>>> diff --git a/include/trace/events/skb.h b/include/trace/events/skb.h
>>> index d732f07..a33893f 100644
>>> --- a/include/trace/events/skb.h
>>> +++ b/include/trace/events/skb.h
>>> @@ -6,8 +6,154 @@
>>>
>>> #include<linux/skbuff.h>
>>> #include<linux/netdevice.h>
>>> +#include<linux/ip.h>
>>> #include<linux/tracepoint.h>
>>>
>>> +#define FORMAT_IPADDR(x) ((unsigned char *)&x)[3],\
>>> + ((unsigned char *)&x)[2],\
>>> + ((unsigned char *)&x)[1],\
>>> + ((unsigned char *)&x)[0]
>>
>> I think you should use ntohl() to convert Big endian to Little endian.
>> Otherwise you will have problems on some other platforms.
>
> Sorry,Please ignore this comment.I didn't notice that you have use ntohl in TP_fast_assign.
>
Yeah, this is correct.
But it may be better to use ntohl in FORMAT_IPADDR or TP_printk than in TP_fast_assign.
>>
>>> +
>>> +TRACE_EVENT(ip_queue_xmit,
>>> +
>>> + TP_PROTO(struct sk_buff *skb),
>>> +
>>> + TP_ARGS(skb),
>>> +
>>> + TP_STRUCT__entry(
>>> + __field( const void *, skbaddr )
>>> + __field( unsigned int, saddr )
>>> + __field( unsigned int, daddr )
>>> + ),
>>> +
>>> + TP_fast_assign(
>>> + __entry->skbaddr = skb;
>>> + __entry->saddr = ntohl(ip_hdr(skb)->saddr);
>>> + __entry->daddr = ntohl(ip_hdr(skb)->daddr);
>>> + ),
>>> +
>>> + TP_printk("skbaddr=%p saddr=%u.%u.%u.%u daddr=%u.%u.%u.%u",
>>> + __entry->skbaddr,
>>> + FORMAT_IPADDR(__entry->saddr),
>>> + FORMAT_IPADDR(__entry->daddr)
>>
>> Just as I said above,use "FORMAT_IPADDR(ntohl(__entry->daddr))" instead.
>> Same on other places.
>>
>>> + )
>>> +);
>>> +
>>> +TRACE_EVENT(ip_push_pending_frames,
>>> +
>>> + TP_PROTO(struct sk_buff *skb),
>>> +
>>> + TP_ARGS(skb),
>>> +
>>> + TP_STRUCT__entry(
>>> + __field( const void *, skbaddr )
>>> + __field( unsigned int, saddr )
>>> + __field( unsigned int, daddr )
>>> + ),
>>> +
>>> + TP_fast_assign(
>>> + __entry->skbaddr = skb;
>>> + __entry->saddr = ntohl(((struct iphdr *)skb->data)->saddr);
>>> + __entry->daddr = ntohl(((struct iphdr *)skb->data)->daddr);
>>> + ),
>>> +
>>> + TP_printk("skbaddr=%p saddr=%u.%u.%u.%u daddr=%u.%u.%u.%u",
>>> + __entry->skbaddr,
>>> + FORMAT_IPADDR(__entry->saddr),
>>> + FORMAT_IPADDR(__entry->daddr)
>>> + )
>>> +);
>>> +
>>> +TRACE_EVENT(ip_output,
>>> +
>>> + TP_PROTO(struct sk_buff *skb),
>>> +
>>> + TP_ARGS(skb),
>>> +
>>> + TP_STRUCT__entry(
>>> + __field( const void *, skbaddr )
>>> + __field( unsigned int, saddr )
>>> + __field( unsigned int, daddr )
>>> + ),
>>> +
>>> + TP_fast_assign(
>>> + __entry->skbaddr = skb;
>>> + __entry->saddr = ntohl(ip_hdr(skb)->saddr);
>>> + __entry->daddr = ntohl(ip_hdr(skb)->daddr);
>>> + ),
>>> +
>>> + TP_printk("skbaddr=%p saddr=%u.%u.%u.%u daddr=%u.%u.%u.%u",
>>> + __entry->skbaddr,
>>> + FORMAT_IPADDR(__entry->saddr),
>>> + FORMAT_IPADDR(__entry->daddr)
>>> + )
>>> +);
>>> +
>>> +TRACE_EVENT(ip_rcv,
>>> +
>>> + TP_PROTO(struct sk_buff *skb),
>>> +
>>> + TP_ARGS(skb),
>>> +
>>> + TP_STRUCT__entry(
>>> + __field( const void *, skbaddr )
>>> + __field( unsigned int, saddr )
>>> + __field( unsigned int, daddr )
>>> + ),
>>> +
>>> + TP_fast_assign(
>>> + __entry->skbaddr = skb;
>>> + __entry->saddr = ntohl(ip_hdr(skb)->saddr);
>>> + __entry->daddr = ntohl(ip_hdr(skb)->daddr);
>>> + ),
>>> +
>>> + TP_printk("skbaddr=%p saddr=%u.%u.%u.%u daddr=%u.%u.%u.%u",
>>> + __entry->skbaddr,
>>> + FORMAT_IPADDR(__entry->saddr),
>>> + FORMAT_IPADDR(__entry->daddr)
>>> + )
>>> +);
>>> +
>>> +TRACE_EVENT(ip_frag_queue,
>>> +
>>> + TP_PROTO(struct sk_buff *skb, struct sk_buff *prev),
>>> +
>>> + TP_ARGS(skb, prev),
>>> +
>>> + TP_STRUCT__entry(
>>> + __field( const void *, skbaddr )
>>> + __field( const void *, prevaddr )
>>> + ),
>>> +
>>> + TP_fast_assign(
>>> + __entry->skbaddr = skb;
>>> + __entry->prevaddr = prev;
>>> + ),
>>> +
>>> + TP_printk("skbaddr=%p prev=%p",
>>> + __entry->skbaddr, __entry->prevaddr)
>>> +);
>>> +
>>> +TRACE_EVENT(ip_frag_reasm,
>>> +
>>> + TP_PROTO(struct sk_buff *head),
>>> +
>>> + TP_ARGS(head),
>>> +
>>> + TP_STRUCT__entry(
>>> + __field( const void *, skbaddr )
>>> + __field( unsigned int, len )
>>> + ),
>>> +
>>> + TP_fast_assign(
>>> + __entry->skbaddr = head;
>>> + __entry->len = head->len;
>>> + ),
>>> +
>>> + TP_printk("head=%p len=%u",
>>> + __entry->skbaddr, __entry->len)
>>> +);
>>> +
>>> TRACE_EVENT(dev_queue_xmit,
>>>
>>> TP_PROTO(struct sk_buff *skb,
>>> @@ -77,6 +223,48 @@ TRACE_EVENT(netdev_receive_skb,
>>> __get_str(name), __entry->skbaddr, __entry->len)
>>> );
>>>
>>> +TRACE_EVENT(senddata_copy_skb,
>>> +
>>> + TP_PROTO(struct sock *sk, struct sk_buff *skb, int len),
>>> +
>>> + TP_ARGS(sk, skb, len),
>>> +
>>> + TP_STRUCT__entry(
>>> + __field( const void *, skaddr )
>>> + __field( const void *, skbaddr )
>>> + __field( int, len )
>>> + ),
>>> +
>>> + TP_fast_assign(
>>> + __entry->skaddr = sk;
>>> + __entry->skbaddr = skb;
>>> + __entry->len = len;
>>> + ),
>>> +
>>> + TP_printk("sk=%p skbaddr=%p len=%d",
>>> + __entry->skaddr, __entry->skbaddr, __entry->len)
>>> +);
>>> +
>>> +TRACE_EVENT(skb_clone,
>>> +
>>> + TP_PROTO(struct sk_buff *original_skb, struct sk_buff *clone_skb),
>>> +
>>> + TP_ARGS(original_skb, clone_skb),
>>> +
>>> + TP_STRUCT__entry(
>>> + __field( const void *, original_skbaddr )
>>> + __field( const void *, clone_skbaddr )
>>> + ),
>>> +
>>> + TP_fast_assign(
>>> + __entry->original_skbaddr = original_skb;
>>> + __entry->clone_skbaddr = clone_skb;
>>> + ),
>>> +
>>> + TP_printk("original=%p clone=%p",
>>> + __entry->original_skbaddr, __entry->clone_skbaddr)
>>> +);
>>> +
>>> /*
>>> * Tracepoint for free an sk_buff:
>>> */
>>> diff --git a/net/core/skbuff.c b/net/core/skbuff.c
>>> index 93c4e06..1712416 100644
>>> --- a/net/core/skbuff.c
>>> +++ b/net/core/skbuff.c
>>> @@ -649,6 +649,7 @@ struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t gfp_mask)
>>> kmemcheck_annotate_bitfield(n, flags2);
>>> n->fclone = SKB_FCLONE_UNAVAILABLE;
>>> }
>>> + trace_skb_clone(skb, n);
>>>
>>> return __skb_clone(n, skb);
>>> }
>>> diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
>>> index 86964b3..c7e683c 100644
>>> --- a/net/ipv4/ip_fragment.c
>>> +++ b/net/ipv4/ip_fragment.c
>>> @@ -42,6 +42,7 @@
>>> #include<linux/udp.h>
>>> #include<linux/inet.h>
>>> #include<linux/netfilter_ipv4.h>
>>> +#include<trace/events/skb.h>
>>>
>>> /* NOTE. Logic of IP defragmentation is parallel to corresponding IPv6
>>> * code now. If you change something here, _PLEASE_ update ipv6/reassembly.c
>>> @@ -428,6 +429,7 @@ static int ip_frag_queue(struct ipq *qp, struct sk_buff *skb)
>>>
>>> /* Insert this fragment in the chain of fragments. */
>>> skb->next = next;
>>> + trace_ip_frag_queue(skb, prev);
>>> if (prev)
>>> prev->next = skb;
>>> else
>>> @@ -492,6 +494,7 @@ static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev,
>>>
>>> WARN_ON(head == NULL);
>>> WARN_ON(FRAG_CB(head)->offset != 0);
>>> + trace_ip_frag_reasm(head);
>>>
>>> /* Allocate a new buffer for the datagram. */
>>> ihlen = ip_hdrlen(head);
>>> diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
>>> index c29de98..6fbbd34 100644
>>> --- a/net/ipv4/ip_input.c
>>> +++ b/net/ipv4/ip_input.c
>>> @@ -144,6 +144,8 @@
>>> #include<linux/mroute.h>
>>> #include<linux/netlink.h>
>>>
>>> +#include<trace/events/skb.h>
>>> +
>>> /*
>>> * Process Router Attention IP option
>>> */
>>> @@ -383,6 +385,7 @@ int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
>>> /* When the interface is in promisc. mode, drop all the crap
>>> * that it receives, do not try to analyse it.
>>> */
>>> + trace_ip_rcv(skb);
>>> if (skb->pkt_type == PACKET_OTHERHOST)
>>> goto drop;
>>>
>>> diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
>>> index 3451799..3dac18c 100644
>>> --- a/net/ipv4/ip_output.c
>>> +++ b/net/ipv4/ip_output.c
>>> @@ -80,6 +80,8 @@
>>> #include<linux/netlink.h>
>>> #include<linux/tcp.h>
>>>
>>> +#include<trace/events/skb.h>
>>> +
>>> int sysctl_ip_default_ttl __read_mostly = IPDEFTTL;
>>>
>>> /* Generate a checksum for an outgoing IP datagram. */
>>> @@ -300,6 +302,7 @@ int ip_output(struct sk_buff *skb)
>>> {
>>> struct net_device *dev = skb_dst(skb)->dev;
>>>
>>> + trace_ip_output(skb);
>>> IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUT, skb->len);
>>>
>>> skb->dev = dev;
>>> @@ -378,6 +381,7 @@ packet_routed:
>>> iph->saddr = rt->rt_src;
>>> iph->daddr = rt->rt_dst;
>>> /* Transport layer set skb->h.foo itself. */
>>> + trace_ip_queue_xmit(skb);
>>>
>>> if (opt&& opt->optlen) {
>>> iph->ihl += opt->optlen>> 2;
>>> @@ -991,6 +995,7 @@ alloc_new_skb:
>>> /*
>>> * Put the packet on the pending queue.
>>> */
>>> + trace_senddata_copy_skb(sk, skb, copy);
>>> __skb_queue_tail(&sk->sk_write_queue, skb);
>>> continue;
>>> }
>>> @@ -1008,6 +1013,7 @@ alloc_new_skb:
>>> err = -EFAULT;
>>> goto error;
>>> }
>>> + trace_senddata_copy_skb(sk, skb, copy);
>>> } else {
>>> int i = skb_shinfo(skb)->nr_frags;
>>> skb_frag_t *frag =&skb_shinfo(skb)->frags[i-1];
>>> @@ -1054,6 +1060,7 @@ alloc_new_skb:
>>> skb->data_len += copy;
>>> skb->truesize += copy;
>>> atomic_add(copy,&sk->sk_wmem_alloc);
>>> + trace_senddata_copy_skb(sk, skb, copy);
>>> }
>>> offset += copy;
>>> length -= copy;
>>> @@ -1171,6 +1178,7 @@ ssize_t ip_append_page(struct sock *sk, struct page *page,
>>> /*
>>> * Put the packet on the pending queue.
>>> */
>>> + trace_senddata_copy_skb(sk, skb, len);
>>> __skb_queue_tail(&sk->sk_write_queue, skb);
>>> continue;
>>> }
>>> @@ -1200,6 +1208,7 @@ ssize_t ip_append_page(struct sock *sk, struct page *page,
>>> atomic_add(len,&sk->sk_wmem_alloc);
>>> offset += len;
>>> size -= len;
>>> + trace_senddata_copy_skb(sk, skb, len);
>>> }
>>> return 0;
>>>
>>> @@ -1291,6 +1300,8 @@ int ip_push_pending_frames(struct sock *sk)
>>> iph->saddr = rt->rt_src;
>>> iph->daddr = rt->rt_dst;
>>>
>>> + trace_ip_push_pending_frames(skb);
>>> +
>>> skb->priority = sk->sk_priority;
>>> skb->mark = sk->sk_mark;
>>> /*
>>>
>>> --
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>>>
>>
>>
>
>
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