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authorEliezer Tamir <eliezer.tamir@linux.intel.com>2013-06-14 16:33:57 +0300
committerDavid S. Miller <davem@davemloft.net>2013-06-17 15:48:14 -0700
commitdafcc4380deec21d160c31411f33c8813f67f517 (patch)
tree4d1984857eca0b470d229604a5634fee87da7073 /net/core/sock.c
parent89bf1b5a683df497c572c4d3bd3f9c9aa919d773 (diff)
downloadblackbird-op-linux-dafcc4380deec21d160c31411f33c8813f67f517.tar.gz
blackbird-op-linux-dafcc4380deec21d160c31411f33c8813f67f517.zip
net: add socket option for low latency polling
adds a socket option for low latency polling. This allows overriding the global sysctl value with a per-socket one. Unexport sysctl_net_ll_poll since for now it's not needed in modules. Signed-off-by: Eliezer Tamir <eliezer.tamir@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/sock.c')
-rw-r--r--net/core/sock.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/net/core/sock.c b/net/core/sock.c
index 788c0da5eed1..1e744b12fda3 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -913,6 +913,19 @@ set_rcvbuf:
sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
break;
+#ifdef CONFIG_NET_LL_RX_POLL
+ case SO_LL:
+ /* allow unprivileged users to decrease the value */
+ if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN))
+ ret = -EPERM;
+ else {
+ if (val < 0)
+ ret = -EINVAL;
+ else
+ sk->sk_ll_usec = val;
+ }
+ break;
+#endif
default:
ret = -ENOPROTOOPT;
break;
@@ -1170,6 +1183,12 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
break;
+#ifdef CONFIG_NET_LL_RX_POLL
+ case SO_LL:
+ v.val = sk->sk_ll_usec;
+ break;
+#endif
+
default:
return -ENOPROTOOPT;
}
@@ -2288,6 +2307,7 @@ void sock_init_data(struct socket *sock, struct sock *sk)
#ifdef CONFIG_NET_LL_RX_POLL
sk->sk_napi_id = 0;
+ sk->sk_ll_usec = sysctl_net_ll_poll;
#endif
/*
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