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Date: Tue, 19 Jan 2010 15:23:30 +0800
From: Yang Hongyang <yanghy@...fujitsu.com>
To: Koki Sanagi <sanagi.koki@...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
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.
>
>> +
>> +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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>> the body of a message to majordomo@...r.kernel.org
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>>
>>
>
>
--
Regards
Yang Hongyang
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