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udp: sk_drops handling

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In commits 33c732c361 ([IPV4]: Add raw
drops counter) and a92aa318b4 ([IPV6]:
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@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2008-06-17 21:04:56 -07:00
committed by David S. Miller
parent fe2c802ab6
commit cb61cb9b8b
5 changed files with 17 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
net/ipv6/udp.c
View File

@@ -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;