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Date: Wed, 18 Jun 2008 05:46:21 +0200
From: Eric Dumazet <dada1@...mosbay.com>
To: Wang Chen <wangchen@...fujitsu.com>
Cc: "David S. Miller" <davem@...emloft.net>,
Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH] udp: sk_drops handling
Wang Chen a écrit :
> Eric Dumazet said the following on 2008-6-18 5:31:
>> In commits 33c732c36169d7022ad7d6eb474b0c9be43a2dc1 ([IPV4]: Add raw drops
>> counter) and a92aa318b4b369091fd80433c80e62838db8bc1c ([IPV4]: Add raw
>> drops
>> counter),
>> Wang Chen added raw drops counter for /proc/net/raw & /proc/net/raw6
>>
>> This patch adds this capability to UDP sockets too (/proc/net/udp &
>> /proc/net/udp6).
>>
>> This means that 'RcvbufErrors' errors found in /proc/net/snmp can be also
>> be examined for each udp socket.
>>
>> # grep Udp: /proc/net/snmp
>> Udp: InDatagrams NoPorts InErrors OutDatagrams RcvbufErrors SndbufErrors
>> Udp: 23971006 75 899420 16390693 146348 0
>>
>> # cat /proc/net/udp
>> sl local_address rem_address st tx_queue rx_queue tr tm->when
>> retrnsmt ---
>> uid timeout inode ref pointer drops
>> 75: 00000000:02CB 00000000:0000 07 00000000:00000000 00:00000000
>> 00000000 ---
>> 0 0 2358 2 ffff81082a538c80 0
>> 111: 00000000:006F 00000000:0000 07 00000000:00000000 00:00000000
>> 00000000 ---
>> 0 0 2286 2 ffff81042dd35c80 146348
>>
>> In this example, only port 111 (0x006F) was flooded by messages that
>> user program
>> could not read fast enough. 146348 messages were lost.
>>
>
> How about other place, such as, rxrpc_data_ready() also inc UDP_MIB_INERRORS.
Hum... my intent was to only count UDP_MIB_RCVBUFFERRORS (to mimic raw sk_drops behavior)
Updated patch follows.
Thank you
[PATCH]udp: sk_drops handling
In commits 33c732c36169d7022ad7d6eb474b0c9be43a2dc1 ([IPV4]: Add raw drops
counter) and a92aa318b4b369091fd80433c80e62838db8bc1c ([IPV4]: Add raw drops
counter),
Wang Chen added raw drops counter for /proc/net/raw & /proc/net/raw6
This patch adds this capability to UDP sockets too (/proc/net/udp &
/proc/net/udp6).
This means that 'RcvbufErrors' errors found in /proc/net/snmp can be also
be examined for each udp socket.
# grep Udp: /proc/net/snmp
Udp: InDatagrams NoPorts InErrors OutDatagrams RcvbufErrors SndbufErrors
Udp: 23971006 75 899420 16390693 146348 0
# cat /proc/net/udp
sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt ---
uid timeout inode ref pointer drops
75: 00000000:02CB 00000000:0000 07 00000000:00000000 00:00000000 00000000 ---
0 0 2358 2 ffff81082a538c80 0
111: 00000000:006F 00000000:0000 07 00000000:00000000 00:00000000 00000000 ---
0 0 2286 2 ffff81042dd35c80 146348
In this example, only port 111 (0x006F) was flooded by messages that user program
could not read fast enough. 146348 messages were lost.
Signed-off-by: Eric Dumazet <dada1@...mosbay.com>
diff --git a/include/net/sock.h b/include/net/sock.h
index 83f74b1..a7c3041 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -166,7 +166,7 @@ struct sock_common {
* @sk_err: last error
* @sk_err_soft: errors that don't cause failure but are the cause of a
* persistent failure not just 'timed out'
- * @sk_drops: raw drops counter
+ * @sk_drops: raw/udp drops counter
* @sk_ack_backlog: current listen backlog
* @sk_max_ack_backlog: listen backlog set in listen()
* @sk_priority: %SO_PRIORITY setting
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 7d44946..925fdf1 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -944,7 +944,7 @@ static int raw_seq_show(struct seq_file *seq, void *v)
if (v == SEQ_START_TOKEN)
seq_printf(seq, " sl local_address rem_address st tx_queue "
"rx_queue tr tm->when retrnsmt uid timeout "
- "inode drops\n");
+ "inode ref pointer drops\n");
else
raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
return 0;
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 11eabf1..3bbf6fb 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1040,8 +1040,10 @@ int udp_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
/* Note that an ENOMEM error is charged twice */
- if (rc == -ENOMEM)
+ if (rc == -ENOMEM) {
UDP_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, is_udplite);
+ atomic_inc(&sk->sk_drops);
+ }
goto drop;
}
@@ -1629,12 +1631,13 @@ static void udp4_format_sock(struct sock *sp, struct seq_file *f,
__u16 srcp = ntohs(inet->sport);
seq_printf(f, "%4d: %08X:%04X %08X:%04X"
- " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p%n",
+ " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d%n",
bucket, src, srcp, dest, destp, sp->sk_state,
atomic_read(&sp->sk_wmem_alloc),
atomic_read(&sp->sk_rmem_alloc),
0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
- atomic_read(&sp->sk_refcnt), sp, len);
+ atomic_read(&sp->sk_refcnt), sp,
+ atomic_read(&sp->sk_drops), len);
}
int udp4_seq_show(struct seq_file *seq, void *v)
@@ -1643,7 +1646,7 @@ int udp4_seq_show(struct seq_file *seq, void *v)
seq_printf(seq, "%-127s\n",
" sl local_address rem_address st tx_queue "
"rx_queue tr tm->when retrnsmt uid timeout "
- "inode");
+ "inode ref pointer drops");
else {
struct udp_iter_state *state = seq->private;
int len;
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 456777d..34cfb3f 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -1251,7 +1251,7 @@ static int raw6_seq_show(struct seq_file *seq, void *v)
"local_address "
"remote_address "
"st tx_queue rx_queue tr tm->when retrnsmt"
- " uid timeout inode drops\n");
+ " uid timeout inode ref pointer drops\n");
else
raw6_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
return 0;
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 432edaa..f91e1df 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -297,8 +297,10 @@ int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
/* Note that an ENOMEM error is charged twice */
- if (rc == -ENOMEM)
+ if (rc == -ENOMEM) {
UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, is_udplite);
+ atomic_inc(&sk->sk_drops);
+ }
goto drop;
}
@@ -955,7 +957,7 @@ static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket
srcp = ntohs(inet->sport);
seq_printf(seq,
"%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
- "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
+ "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
bucket,
src->s6_addr32[0], src->s6_addr32[1],
src->s6_addr32[2], src->s6_addr32[3], srcp,
@@ -967,7 +969,8 @@ static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket
0, 0L, 0,
sock_i_uid(sp), 0,
sock_i_ino(sp),
- atomic_read(&sp->sk_refcnt), sp);
+ atomic_read(&sp->sk_refcnt), sp,
+ atomic_read(&sp->sk_drops));
}
int udp6_seq_show(struct seq_file *seq, void *v)
@@ -978,7 +981,7 @@ int udp6_seq_show(struct seq_file *seq, void *v)
"local_address "
"remote_address "
"st tx_queue rx_queue tr tm->when retrnsmt"
- " uid timeout inode\n");
+ " uid timeout inode ref pointer drops\n");
else
udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
return 0;
--
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