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authorEric Dumazet <edumazet@google.com>2013-09-24 08:20:52 -0700
committerDavid S. Miller <davem@davemloft.net>2013-09-28 15:35:41 -0700
commit62748f32d501f5d3712a7c372bbb92abc7c62bc7 (patch)
tree847a6e4b66aaf012809ff8656476743e738f1a2b
parent4aa0a03f519812f48ac48d046bc451e97649ec82 (diff)
downloadlinux-stericsson-62748f32d501f5d3712a7c372bbb92abc7c62bc7.tar.gz
net: introduce SO_MAX_PACING_RATE
As mentioned in commit afe4fd062416b ("pkt_sched: fq: Fair Queue packet scheduler"), this patch adds a new socket option. SO_MAX_PACING_RATE offers the application the ability to cap the rate computed by transport layer. Value is in bytes per second. u32 val = 1000000; setsockopt(sockfd, SOL_SOCKET, SO_MAX_PACING_RATE, &val, sizeof(val)); To be effectively paced, a flow must use FQ packet scheduler. Note that a packet scheduler takes into account the headers for its computations. The effective payload rate depends on MSS and retransmits if any. I chose to make this pacing rate a SOL_SOCKET option instead of a TCP one because this can be used by other protocols. Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Steinar H. Gunderson <sesse@google.com> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--arch/alpha/include/uapi/asm/socket.h4
-rw-r--r--arch/avr32/include/uapi/asm/socket.h2
-rw-r--r--arch/cris/include/uapi/asm/socket.h2
-rw-r--r--arch/frv/include/uapi/asm/socket.h2
-rw-r--r--arch/h8300/include/uapi/asm/socket.h2
-rw-r--r--arch/ia64/include/uapi/asm/socket.h2
-rw-r--r--arch/m32r/include/uapi/asm/socket.h2
-rw-r--r--arch/mips/include/uapi/asm/socket.h2
-rw-r--r--arch/mn10300/include/uapi/asm/socket.h2
-rw-r--r--arch/parisc/include/uapi/asm/socket.h2
-rw-r--r--arch/powerpc/include/uapi/asm/socket.h2
-rw-r--r--arch/s390/include/uapi/asm/socket.h2
-rw-r--r--arch/sparc/include/uapi/asm/socket.h2
-rw-r--r--arch/xtensa/include/uapi/asm/socket.h2
-rw-r--r--include/net/sock.h1
-rw-r--r--include/uapi/asm-generic/socket.h2
-rw-r--r--net/core/sock.c12
-rw-r--r--net/ipv4/tcp_input.c2
18 files changed, 45 insertions, 2 deletions
diff --git a/arch/alpha/include/uapi/asm/socket.h b/arch/alpha/include/uapi/asm/socket.h
index 467de010ea7e..e3a1491d5073 100644
--- a/arch/alpha/include/uapi/asm/socket.h
+++ b/arch/alpha/include/uapi/asm/socket.h
@@ -81,6 +81,8 @@
#define SO_SELECT_ERR_QUEUE 45
-#define SO_BUSY_POLL 46
+#define SO_BUSY_POLL 46
+
+#define SO_MAX_PACING_RATE 47
#endif /* _UAPI_ASM_SOCKET_H */
diff --git a/arch/avr32/include/uapi/asm/socket.h b/arch/avr32/include/uapi/asm/socket.h
index 11c4259c62fb..439936421434 100644
--- a/arch/avr32/include/uapi/asm/socket.h
+++ b/arch/avr32/include/uapi/asm/socket.h
@@ -76,4 +76,6 @@
#define SO_BUSY_POLL 46
+#define SO_MAX_PACING_RATE 47
+
#endif /* __ASM_AVR32_SOCKET_H */
diff --git a/arch/cris/include/uapi/asm/socket.h b/arch/cris/include/uapi/asm/socket.h
index eb723e51554e..13829aaaeec5 100644
--- a/arch/cris/include/uapi/asm/socket.h
+++ b/arch/cris/include/uapi/asm/socket.h
@@ -78,6 +78,8 @@
#define SO_BUSY_POLL 46
+#define SO_MAX_PACING_RATE 47
+
#endif /* _ASM_SOCKET_H */
diff --git a/arch/frv/include/uapi/asm/socket.h b/arch/frv/include/uapi/asm/socket.h
index f0cb1c341163..5d4299762426 100644
--- a/arch/frv/include/uapi/asm/socket.h
+++ b/arch/frv/include/uapi/asm/socket.h
@@ -76,5 +76,7 @@
#define SO_BUSY_POLL 46
+#define SO_MAX_PACING_RATE 47
+
#endif /* _ASM_SOCKET_H */
diff --git a/arch/h8300/include/uapi/asm/socket.h b/arch/h8300/include/uapi/asm/socket.h
index 9490758c5e2b..214ccaf3554a 100644
--- a/arch/h8300/include/uapi/asm/socket.h
+++ b/arch/h8300/include/uapi/asm/socket.h
@@ -76,4 +76,6 @@
#define SO_BUSY_POLL 46
+#define SO_MAX_PACING_RATE 47
+
#endif /* _ASM_SOCKET_H */
diff --git a/arch/ia64/include/uapi/asm/socket.h b/arch/ia64/include/uapi/asm/socket.h
index 556d0701a155..c25302fb48d9 100644
--- a/arch/ia64/include/uapi/asm/socket.h
+++ b/arch/ia64/include/uapi/asm/socket.h
@@ -85,4 +85,6 @@
#define SO_BUSY_POLL 46
+#define SO_MAX_PACING_RATE 47
+
#endif /* _ASM_IA64_SOCKET_H */
diff --git a/arch/m32r/include/uapi/asm/socket.h b/arch/m32r/include/uapi/asm/socket.h
index 24be7c8da86a..52966650114f 100644
--- a/arch/m32r/include/uapi/asm/socket.h
+++ b/arch/m32r/include/uapi/asm/socket.h
@@ -76,4 +76,6 @@
#define SO_BUSY_POLL 46
+#define SO_MAX_PACING_RATE 47
+
#endif /* _ASM_M32R_SOCKET_H */
diff --git a/arch/mips/include/uapi/asm/socket.h b/arch/mips/include/uapi/asm/socket.h
index 61c01f054d1b..0df9787cd84d 100644
--- a/arch/mips/include/uapi/asm/socket.h
+++ b/arch/mips/include/uapi/asm/socket.h
@@ -94,4 +94,6 @@
#define SO_BUSY_POLL 46
+#define SO_MAX_PACING_RATE 47
+
#endif /* _UAPI_ASM_SOCKET_H */
diff --git a/arch/mn10300/include/uapi/asm/socket.h b/arch/mn10300/include/uapi/asm/socket.h
index e2a2b203eb00..71dedcae55a6 100644
--- a/arch/mn10300/include/uapi/asm/socket.h
+++ b/arch/mn10300/include/uapi/asm/socket.h
@@ -76,4 +76,6 @@
#define SO_BUSY_POLL 46
+#define SO_MAX_PACING_RATE 47
+
#endif /* _ASM_SOCKET_H */
diff --git a/arch/parisc/include/uapi/asm/socket.h b/arch/parisc/include/uapi/asm/socket.h
index 71700e636a8e..7c614d01f1fa 100644
--- a/arch/parisc/include/uapi/asm/socket.h
+++ b/arch/parisc/include/uapi/asm/socket.h
@@ -75,6 +75,8 @@
#define SO_BUSY_POLL 0x4027
+#define SO_MAX_PACING_RATE 0x4048
+
/* O_NONBLOCK clashes with the bits used for socket types. Therefore we
* have to define SOCK_NONBLOCK to a different value here.
*/
diff --git a/arch/powerpc/include/uapi/asm/socket.h b/arch/powerpc/include/uapi/asm/socket.h
index a6d74467c9ed..fa698324a1fd 100644
--- a/arch/powerpc/include/uapi/asm/socket.h
+++ b/arch/powerpc/include/uapi/asm/socket.h
@@ -83,4 +83,6 @@
#define SO_BUSY_POLL 46
+#define SO_MAX_PACING_RATE 47
+
#endif /* _ASM_POWERPC_SOCKET_H */
diff --git a/arch/s390/include/uapi/asm/socket.h b/arch/s390/include/uapi/asm/socket.h
index 92494494692e..c286c2e868f0 100644
--- a/arch/s390/include/uapi/asm/socket.h
+++ b/arch/s390/include/uapi/asm/socket.h
@@ -82,4 +82,6 @@
#define SO_BUSY_POLL 46
+#define SO_MAX_PACING_RATE 47
+
#endif /* _ASM_SOCKET_H */
diff --git a/arch/sparc/include/uapi/asm/socket.h b/arch/sparc/include/uapi/asm/socket.h
index 4e1d66c3ce71..0f21e9a5ca18 100644
--- a/arch/sparc/include/uapi/asm/socket.h
+++ b/arch/sparc/include/uapi/asm/socket.h
@@ -72,6 +72,8 @@
#define SO_BUSY_POLL 0x0030
+#define SO_MAX_PACING_RATE 0x0031
+
/* Security levels - as per NRL IPv6 - don't actually do anything */
#define SO_SECURITY_AUTHENTICATION 0x5001
#define SO_SECURITY_ENCRYPTION_TRANSPORT 0x5002
diff --git a/arch/xtensa/include/uapi/asm/socket.h b/arch/xtensa/include/uapi/asm/socket.h
index c114483010c1..7db5c22faa68 100644
--- a/arch/xtensa/include/uapi/asm/socket.h
+++ b/arch/xtensa/include/uapi/asm/socket.h
@@ -87,4 +87,6 @@
#define SO_BUSY_POLL 46
+#define SO_MAX_PACING_RATE 47
+
#endif /* _XTENSA_SOCKET_H */
diff --git a/include/net/sock.h b/include/net/sock.h
index 4625d2eff461..240aa3f08cd6 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -363,6 +363,7 @@ struct sock {
int sk_wmem_queued;
gfp_t sk_allocation;
u32 sk_pacing_rate; /* bytes per second */
+ u32 sk_max_pacing_rate;
netdev_features_t sk_route_caps;
netdev_features_t sk_route_nocaps;
int sk_gso_type;
diff --git a/include/uapi/asm-generic/socket.h b/include/uapi/asm-generic/socket.h
index f04b69b6abf2..38f14d0264c3 100644
--- a/include/uapi/asm-generic/socket.h
+++ b/include/uapi/asm-generic/socket.h
@@ -78,4 +78,6 @@
#define SO_BUSY_POLL 46
+#define SO_MAX_PACING_RATE 47
+
#endif /* __ASM_GENERIC_SOCKET_H */
diff --git a/net/core/sock.c b/net/core/sock.c
index 5b6beba494a3..2bd9b3faa0d0 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -914,6 +914,13 @@ set_rcvbuf:
}
break;
#endif
+
+ case SO_MAX_PACING_RATE:
+ sk->sk_max_pacing_rate = val;
+ sk->sk_pacing_rate = min(sk->sk_pacing_rate,
+ sk->sk_max_pacing_rate);
+ break;
+
default:
ret = -ENOPROTOOPT;
break;
@@ -1177,6 +1184,10 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
break;
#endif
+ case SO_MAX_PACING_RATE:
+ v.val = sk->sk_max_pacing_rate;
+ break;
+
default:
return -ENOPROTOOPT;
}
@@ -2319,6 +2330,7 @@ void sock_init_data(struct socket *sock, struct sock *sk)
sk->sk_ll_usec = sysctl_net_busy_read;
#endif
+ sk->sk_max_pacing_rate = ~0U;
/*
* Before updating sk_refcnt, we must commit prior changes to memory
* (Documentation/RCU/rculist_nulls.txt for details)
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 5d083855c111..66aa816ad30b 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -735,7 +735,7 @@ static void tcp_update_pacing_rate(struct sock *sk)
if (tp->srtt > 8 + 2)
do_div(rate, tp->srtt);
- sk->sk_pacing_rate = min_t(u64, rate, ~0U);
+ sk->sk_pacing_rate = min_t(u64, rate, sk->sk_max_pacing_rate);
}
/* Calculate rto without backoff. This is the second half of Van Jacobson's