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net: snmp: kill various STATS_USER() helpers

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In the old days (before linux-3.0), SNMP counters were duplicated,
one for user context, and one for BH context.

After commit 8f0ea0fe3a ("snmp: reduce percpu needs by 50%")
we have a single copy, and what really matters is preemption being
enabled or disabled, since we use this_cpu_inc() or __this_cpu_inc()
respectively.

We therefore kill SNMP_INC_STATS_USER(), SNMP_ADD_STATS_USER(),
NET_INC_STATS_USER(), NET_ADD_STATS_USER(), SCTP_INC_STATS_USER(),
SNMP_INC_STATS64_USER(), SNMP_ADD_STATS64_USER(), TCP_ADD_STATS_USER(),
UDP_INC_STATS_USER(), UDP6_INC_STATS_USER(), and XFRM_INC_STATS_USER()

Following patches will rename __BH helpers to make clear their
usage is not tied to BH being disabled.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2016-04-27 16:44:27 -07:00 committed by David S. Miller
parent 2995aea5b6
commit 6aef70a851
10 changed files with 59 additions and 78 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/ip.h
View File

@ -194,10 +194,8 @@ void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb,
#define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val)
#define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
#define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
#define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
#define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
#define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
#define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd)
u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offct);
unsigned long snmp_fold_field(void __percpu *mib, int offt);

1
include/net/sctp/sctp.h
View File

@ -207,7 +207,6 @@ extern int sysctl_sctp_wmem[3];
/* SCTP SNMP MIB stats handlers */
#define SCTP_INC_STATS(net, field) SNMP_INC_STATS((net)->sctp.sctp_statistics, field)
#define SCTP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->sctp.sctp_statistics, field)
#define SCTP_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->sctp.sctp_statistics, field)
#define SCTP_DEC_STATS(net, field) SNMP_DEC_STATS((net)->sctp.sctp_statistics, field)
/* sctp mib definitions */

22
include/net/snmp.h
View File

@ -126,9 +126,6 @@ struct linux_xfrm_mib {
#define SNMP_INC_STATS_BH(mib, field) \
__this_cpu_inc(mib->mibs[field])
#define SNMP_INC_STATS_USER(mib, field) \
this_cpu_inc(mib->mibs[field])
#define SNMP_INC_STATS_ATOMIC_LONG(mib, field) \
atomic_long_inc(&mib->mibs[field])
@ -141,9 +138,6 @@ struct linux_xfrm_mib {
#define SNMP_ADD_STATS_BH(mib, field, addend) \
__this_cpu_add(mib->mibs[field], addend)
#define SNMP_ADD_STATS_USER(mib, field, addend) \
this_cpu_add(mib->mibs[field], addend)
#define SNMP_ADD_STATS(mib, field, addend) \
this_cpu_add(mib->mibs[field], addend)
#define SNMP_UPD_PO_STATS(mib, basefield, addend) \
@ -170,18 +164,14 @@ struct linux_xfrm_mib {
u64_stats_update_end(&ptr->syncp); \
} while (0)
#define SNMP_ADD_STATS64_USER(mib, field, addend) \
#define SNMP_ADD_STATS64(mib, field, addend) \
do { \
local_bh_disable(); \
preempt_disable(); \
SNMP_ADD_STATS64_BH(mib, field, addend); \
local_bh_enable(); \
preempt_enable(); \
} while (0)
#define SNMP_ADD_STATS64(mib, field, addend) \
SNMP_ADD_STATS64_USER(mib, field, addend)
#define SNMP_INC_STATS64_BH(mib, field) SNMP_ADD_STATS64_BH(mib, field, 1)
#define SNMP_INC_STATS64_USER(mib, field) SNMP_ADD_STATS64_USER(mib, field, 1)
#define SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1)
#define SNMP_UPD_PO_STATS64_BH(mib, basefield, addend) \
do { \
@ -194,17 +184,15 @@ struct linux_xfrm_mib {
} while (0)
#define SNMP_UPD_PO_STATS64(mib, basefield, addend) \
do { \
local_bh_disable(); \
preempt_disable(); \
SNMP_UPD_PO_STATS64_BH(mib, basefield, addend); \
local_bh_enable(); \
preempt_enable(); \
} while (0)
#else
#define SNMP_INC_STATS64_BH(mib, field) SNMP_INC_STATS_BH(mib, field)
#define SNMP_INC_STATS64_USER(mib, field) SNMP_INC_STATS_USER(mib, field)
#define SNMP_INC_STATS64(mib, field) SNMP_INC_STATS(mib, field)
#define SNMP_DEC_STATS64(mib, field) SNMP_DEC_STATS(mib, field)
#define SNMP_ADD_STATS64_BH(mib, field, addend) SNMP_ADD_STATS_BH(mib, field, addend)
#define SNMP_ADD_STATS64_USER(mib, field, addend) SNMP_ADD_STATS_USER(mib, field, addend)
#define SNMP_ADD_STATS64(mib, field, addend) SNMP_ADD_STATS(mib, field, addend)
#define SNMP_UPD_PO_STATS64(mib, basefield, addend) SNMP_UPD_PO_STATS(mib, basefield, addend)
#define SNMP_UPD_PO_STATS64_BH(mib, basefield, addend) SNMP_UPD_PO_STATS_BH(mib, basefield, addend)

9
include/net/tcp.h
View File

@ -334,7 +334,6 @@ extern struct proto tcp_prot;
#define TCP_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.tcp_statistics, field)
#define TCP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.tcp_statistics, field)
#define TCP_DEC_STATS(net, field) SNMP_DEC_STATS((net)->mib.tcp_statistics, field)
#define TCP_ADD_STATS_USER(net, field, val) SNMP_ADD_STATS_USER((net)->mib.tcp_statistics, field, val)
#define TCP_ADD_STATS(net, field, val) SNMP_ADD_STATS((net)->mib.tcp_statistics, field, val)
void tcp_tasklet_init(void);
@ -1298,10 +1297,10 @@ bool tcp_oow_rate_limited(struct net *net, const struct sk_buff *skb,
static inline void tcp_mib_init(struct net *net)
{
/* See RFC 2012 */
TCP_ADD_STATS_USER(net, TCP_MIB_RTOALGORITHM, 1);
TCP_ADD_STATS_USER(net, TCP_MIB_RTOMIN, TCP_RTO_MIN*1000/HZ);
TCP_ADD_STATS_USER(net, TCP_MIB_RTOMAX, TCP_RTO_MAX*1000/HZ);
TCP_ADD_STATS_USER(net, TCP_MIB_MAXCONN, -1);
TCP_ADD_STATS(net, TCP_MIB_RTOALGORITHM, 1);
TCP_ADD_STATS(net, TCP_MIB_RTOMIN, TCP_RTO_MIN*1000/HZ);
TCP_ADD_STATS(net, TCP_MIB_RTOMAX, TCP_RTO_MAX*1000/HZ);
TCP_ADD_STATS(net, TCP_MIB_MAXCONN, -1);
}
/* from STCP */

14
include/net/udp.h
View File

@ -289,20 +289,20 @@ struct sock *udp6_lib_lookup_skb(struct sk_buff *skb,
/*
* SNMP statistics for UDP and UDP-Lite
*/
#define UDP_INC_STATS_USER(net, field, is_udplite) do { \
if (is_udplite) SNMP_INC_STATS_USER((net)->mib.udplite_statistics, field); \
else SNMP_INC_STATS_USER((net)->mib.udp_statistics, field); } while(0)
#define UDP_INC_STATS(net, field, is_udplite) do { \
if (is_udplite) SNMP_INC_STATS((net)->mib.udplite_statistics, field); \
else SNMP_INC_STATS((net)->mib.udp_statistics, field); } while(0)
#define UDP_INC_STATS_BH(net, field, is_udplite) do { \
if (is_udplite) SNMP_INC_STATS_BH((net)->mib.udplite_statistics, field); \
else SNMP_INC_STATS_BH((net)->mib.udp_statistics, field); } while(0)
#define UDP6_INC_STATS_BH(net, field, is_udplite) do { \
#define UDP6_INC_STATS_BH(net, field, is_udplite) do { \
if (is_udplite) SNMP_INC_STATS_BH((net)->mib.udplite_stats_in6, field);\
else SNMP_INC_STATS_BH((net)->mib.udp_stats_in6, field); \
} while(0)
#define UDP6_INC_STATS_USER(net, field, __lite) do { \
if (__lite) SNMP_INC_STATS_USER((net)->mib.udplite_stats_in6, field); \
else SNMP_INC_STATS_USER((net)->mib.udp_stats_in6, field); \
#define UDP6_INC_STATS(net, field, __lite) do { \
if (__lite) SNMP_INC_STATS((net)->mib.udplite_stats_in6, field); \
else SNMP_INC_STATS((net)->mib.udp_stats_in6, field); \
} while(0)
#if IS_ENABLED(CONFIG_IPV6)

2
include/net/xfrm.h
View File

@ -46,11 +46,9 @@
#ifdef CONFIG_XFRM_STATISTICS
#define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
#define XFRM_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
#define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
#else
#define XFRM_INC_STATS(net, field) ((void)(net))
#define XFRM_INC_STATS_BH(net, field) ((void)(net))
#define XFRM_INC_STATS_USER(net, field) ((void)(net))
#endif

12
net/ipv4/tcp.c
View File

@ -1443,7 +1443,7 @@ static void tcp_prequeue_process(struct sock *sk)
struct sk_buff *skb;
struct tcp_sock *tp = tcp_sk(sk);
NET_INC_STATS_USER(sock_net(sk), LINUX_MIB_TCPPREQUEUED);
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPPREQUEUED);
/* RX process wants to run with disabled BHs, though it is not
* necessary */
@ -1777,7 +1777,7 @@ int tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock,
chunk = len - tp->ucopy.len;
if (chunk != 0) {
NET_ADD_STATS_USER(sock_net(sk), LINUX_MIB_TCPDIRECTCOPYFROMBACKLOG, chunk);
NET_ADD_STATS(sock_net(sk), LINUX_MIB_TCPDIRECTCOPYFROMBACKLOG, chunk);
len -= chunk;
copied += chunk;
}
@ -1789,7 +1789,7 @@ do_prequeue:
chunk = len - tp->ucopy.len;
if (chunk != 0) {
NET_ADD_STATS_USER(sock_net(sk), LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE, chunk);
NET_ADD_STATS(sock_net(sk), LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE, chunk);
len -= chunk;
copied += chunk;
}
@ -1875,7 +1875,7 @@ skip_copy:
tcp_prequeue_process(sk);
if (copied > 0 && (chunk = len - tp->ucopy.len) != 0) {
NET_ADD_STATS_USER(sock_net(sk), LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE, chunk);
NET_ADD_STATS(sock_net(sk), LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE, chunk);
len -= chunk;
copied += chunk;
}
@ -2065,13 +2065,13 @@ void tcp_close(struct sock *sk, long timeout)
sk->sk_prot->disconnect(sk, 0);
} else if (data_was_unread) {
/* Unread data was tossed, zap the connection. */
NET_INC_STATS_USER(sock_net(sk), LINUX_MIB_TCPABORTONCLOSE);
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPABORTONCLOSE);
tcp_set_state(sk, TCP_CLOSE);
tcp_send_active_reset(sk, sk->sk_allocation);
} else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) {
/* Check zero linger _after_ checking for unread data. */
sk->sk_prot->disconnect(sk, 0);
NET_INC_STATS_USER(sock_net(sk), LINUX_MIB_TCPABORTONDATA);
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPABORTONDATA);
} else if (tcp_close_state(sk)) {
/* We FIN if the application ate all the data before
* zapping the connection.

24
net/ipv4/udp.c
View File

@ -882,13 +882,13 @@ send:
err = ip_send_skb(sock_net(sk), skb);
if (err) {
if (err == -ENOBUFS && !inet->recverr) {
UDP_INC_STATS_USER(sock_net(sk),
UDP_MIB_SNDBUFERRORS, is_udplite);
UDP_INC_STATS(sock_net(sk),
UDP_MIB_SNDBUFERRORS, is_udplite);
err = 0;
}
} else
UDP_INC_STATS_USER(sock_net(sk),
UDP_MIB_OUTDATAGRAMS, is_udplite);
UDP_INC_STATS(sock_net(sk),
UDP_MIB_OUTDATAGRAMS, is_udplite);
return err;
}
@ -1157,8 +1157,8 @@ out:
* seems like overkill.
*/
if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
UDP_INC_STATS_USER(sock_net(sk),
UDP_MIB_SNDBUFERRORS, is_udplite);
UDP_INC_STATS(sock_net(sk),
UDP_MIB_SNDBUFERRORS, is_udplite);
}
return err;
@ -1352,16 +1352,16 @@ try_again:
trace_kfree_skb(skb, udp_recvmsg);
if (!peeked) {
atomic_inc(&sk->sk_drops);
UDP_INC_STATS_USER(sock_net(sk),
UDP_MIB_INERRORS, is_udplite);
UDP_INC_STATS(sock_net(sk),
UDP_MIB_INERRORS, is_udplite);
}
skb_free_datagram_locked(sk, skb);
return err;
}
if (!peeked)
UDP_INC_STATS_USER(sock_net(sk),
UDP_MIB_INDATAGRAMS, is_udplite);
UDP_INC_STATS(sock_net(sk),
UDP_MIB_INDATAGRAMS, is_udplite);
sock_recv_ts_and_drops(msg, sk, skb);
@ -1386,8 +1386,8 @@ try_again:
csum_copy_err:
slow = lock_sock_fast(sk);
if (!skb_kill_datagram(sk, skb, flags)) {
UDP_INC_STATS_USER(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
UDP_INC_STATS_USER(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
UDP_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
}
unlock_sock_fast(sk, slow);

49
net/ipv6/udp.c
View File

@ -423,24 +423,22 @@ try_again:
if (!peeked) {
atomic_inc(&sk->sk_drops);
if (is_udp4)
UDP_INC_STATS_USER(sock_net(sk),
UDP_MIB_INERRORS,
is_udplite);
UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
is_udplite);
else
UDP6_INC_STATS_USER(sock_net(sk),
UDP_MIB_INERRORS,
is_udplite);
UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
is_udplite);
}
skb_free_datagram_locked(sk, skb);
return err;
}
if (!peeked) {
if (is_udp4)
UDP_INC_STATS_USER(sock_net(sk),
UDP_MIB_INDATAGRAMS, is_udplite);
UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
is_udplite);
else
UDP6_INC_STATS_USER(sock_net(sk),
UDP_MIB_INDATAGRAMS, is_udplite);
UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
is_udplite);
}
sock_recv_ts_and_drops(msg, sk, skb);
@ -487,15 +485,15 @@ csum_copy_err:
slow = lock_sock_fast(sk);
if (!skb_kill_datagram(sk, skb, flags)) {
if (is_udp4) {
UDP_INC_STATS_USER(sock_net(sk),
UDP_MIB_CSUMERRORS, is_udplite);
UDP_INC_STATS_USER(sock_net(sk),
UDP_MIB_INERRORS, is_udplite);
UDP_INC_STATS(sock_net(sk),
UDP_MIB_CSUMERRORS, is_udplite);
UDP_INC_STATS(sock_net(sk),
UDP_MIB_INERRORS, is_udplite);
} else {
UDP6_INC_STATS_USER(sock_net(sk),
UDP_MIB_CSUMERRORS, is_udplite);
UDP6_INC_STATS_USER(sock_net(sk),
UDP_MIB_INERRORS, is_udplite);
UDP6_INC_STATS(sock_net(sk),
UDP_MIB_CSUMERRORS, is_udplite);
UDP6_INC_STATS(sock_net(sk),
UDP_MIB_INERRORS, is_udplite);
}
}
unlock_sock_fast(sk, slow);
@ -1015,13 +1013,14 @@ send:
err = ip6_send_skb(skb);
if (err) {
if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
UDP6_INC_STATS_USER(sock_net(sk),
UDP_MIB_SNDBUFERRORS, is_udplite);
UDP6_INC_STATS(sock_net(sk),
UDP_MIB_SNDBUFERRORS, is_udplite);
err = 0;
}
} else
UDP6_INC_STATS_USER(sock_net(sk),
UDP_MIB_OUTDATAGRAMS, is_udplite);
} else {
UDP6_INC_STATS(sock_net(sk),
UDP_MIB_OUTDATAGRAMS, is_udplite);
}
return err;
}
@ -1342,8 +1341,8 @@ out:
* seems like overkill.
*/
if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
UDP6_INC_STATS_USER(sock_net(sk),
UDP_MIB_SNDBUFERRORS, is_udplite);
UDP6_INC_STATS(sock_net(sk),
UDP_MIB_SNDBUFERRORS, is_udplite);
}
return err;

2
net/sctp/chunk.c
View File

@ -239,7 +239,7 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
offset = 0;
if ((whole > 1) || (whole && over))
SCTP_INC_STATS_USER(sock_net(asoc->base.sk), SCTP_MIB_FRAGUSRMSGS);
SCTP_INC_STATS(sock_net(asoc->base.sk), SCTP_MIB_FRAGUSRMSGS);
/* Create chunks for all the full sized DATA chunks. */
for (i = 0, len = first_len; i < whole; i++) {