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| author | Eric Dumazet <edumazet@google.com> | 2013-09-24 08:20:52 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-09-28 15:35:41 -0700 |
| commit | 62748f32d501f5d3712a7c372bbb92abc7c62bc7 (patch) | |
| tree | 847a6e4b66aaf012809ff8656476743e738f1a2b /net/core/sock.c | |
| parent | 4aa0a03f519812f48ac48d046bc451e97649ec82 (diff) | |
| download | blackbird-op-linux-62748f32d501f5d3712a7c372bbb92abc7c62bc7.tar.gz blackbird-op-linux-62748f32d501f5d3712a7c372bbb92abc7c62bc7.zip | |
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>
Diffstat (limited to 'net/core/sock.c')
| -rw-r--r-- | net/core/sock.c | 12 |
1 files changed, 12 insertions, 0 deletions
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) |
