19 files changed, 58 insertions, 7 deletions

diff --git a/arch/alpha/include/uapi/asm/socket.h b/arch/alpha/include/uapi/asm/socket.h
index eee6ea76bdaf..4885825e498d 100644
--- a/arch/alpha/include/uapi/asm/socket.h
+++ b/arch/alpha/include/uapi/asm/socket.h
@@ -81,4 +81,6 @@
 
 #define SO_SELECT_ERR_QUEUE     45
 
+#define SO_LL                   46
+
 #endif /* _UAPI_ASM_SOCKET_H */
diff --git a/arch/avr32/include/uapi/asm/socket.h b/arch/avr32/include/uapi/asm/socket.h
index 37401f535126..79b61798ebf8 100644
--- a/arch/avr32/include/uapi/asm/socket.h
+++ b/arch/avr32/include/uapi/asm/socket.h
@@ -74,4 +74,6 @@
 
 #define SO_SELECT_ERR_QUEUE     45
 
+#define SO_LL                   46
+
 #endif /* __ASM_AVR32_SOCKET_H */
diff --git a/arch/cris/include/uapi/asm/socket.h b/arch/cris/include/uapi/asm/socket.h
index ba409c9947bc..47b1ec55092d 100644
--- a/arch/cris/include/uapi/asm/socket.h
+++ b/arch/cris/include/uapi/asm/socket.h
@@ -76,6 +76,8 @@
 
 #define SO_SELECT_ERR_QUEUE     45
 
+#define SO_LL                   46
+
 #endif /* _ASM_SOCKET_H */
 
 
diff --git a/arch/frv/include/uapi/asm/socket.h b/arch/frv/include/uapi/asm/socket.h
index 31dbb5d8e13d..dbc08520f22c 100644
--- a/arch/frv/include/uapi/asm/socket.h
+++ b/arch/frv/include/uapi/asm/socket.h
@@ -74,5 +74,7 @@
 
 #define SO_SELECT_ERR_QUEUE     45
 
+#define SO_LL                   46
+
 #endif /* _ASM_SOCKET_H */
 
diff --git a/arch/h8300/include/uapi/asm/socket.h b/arch/h8300/include/uapi/asm/socket.h
index 5d1c6d0870e6..a38d38a6520b 100644
--- a/arch/h8300/include/uapi/asm/socket.h
+++ b/arch/h8300/include/uapi/asm/socket.h
@@ -74,4 +74,6 @@
 
 #define SO_SELECT_ERR_QUEUE     45
 
+#define SO_LL                   46
+
 #endif /* _ASM_SOCKET_H */
diff --git a/arch/ia64/include/uapi/asm/socket.h b/arch/ia64/include/uapi/asm/socket.h
index 6b4329f18b29..d3358b760681 100644
--- a/arch/ia64/include/uapi/asm/socket.h
+++ b/arch/ia64/include/uapi/asm/socket.h
@@ -83,4 +83,6 @@
 
 #define SO_SELECT_ERR_QUEUE     45
 
+#define SO_LL                   46
+
 #endif /* _ASM_IA64_SOCKET_H */
diff --git a/arch/m32r/include/uapi/asm/socket.h b/arch/m32r/include/uapi/asm/socket.h
index 2a3b59e0e171..44aaf4639a4a 100644
--- a/arch/m32r/include/uapi/asm/socket.h
+++ b/arch/m32r/include/uapi/asm/socket.h
@@ -74,4 +74,6 @@
 
 #define SO_SELECT_ERR_QUEUE     45
 
+#define SO_LL                   46
+
 #endif /* _ASM_M32R_SOCKET_H */
diff --git a/arch/mips/include/uapi/asm/socket.h b/arch/mips/include/uapi/asm/socket.h
index 3b211507be7f..6a07992ba6c6 100644
--- a/arch/mips/include/uapi/asm/socket.h
+++ b/arch/mips/include/uapi/asm/socket.h
@@ -92,4 +92,6 @@
 
 #define SO_SELECT_ERR_QUEUE     45
 
+#define SO_LL                   46
+
 #endif /* _UAPI_ASM_SOCKET_H */
diff --git a/arch/mn10300/include/uapi/asm/socket.h b/arch/mn10300/include/uapi/asm/socket.h
index b4ce844c9391..db80fd3e398b 100644
--- a/arch/mn10300/include/uapi/asm/socket.h
+++ b/arch/mn10300/include/uapi/asm/socket.h
@@ -74,4 +74,6 @@
 
 #define SO_SELECT_ERR_QUEUE     45
 
+#define SO_LL                   46
+
 #endif /* _ASM_SOCKET_H */
diff --git a/arch/parisc/include/uapi/asm/socket.h b/arch/parisc/include/uapi/asm/socket.h
index 70c512a386f7..f866fff9a004 100644
--- a/arch/parisc/include/uapi/asm/socket.h
+++ b/arch/parisc/include/uapi/asm/socket.h
@@ -73,6 +73,8 @@
 
 #define SO_SELECT_ERR_QUEUE     0x4026
 
+#define SO_LL                   0x4027
+
 /* 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 a36daf3c6f9a..405fb09bda94 100644
--- a/arch/powerpc/include/uapi/asm/socket.h
+++ b/arch/powerpc/include/uapi/asm/socket.h
@@ -81,4 +81,6 @@
 
 #define SO_SELECT_ERR_QUEUE     45
 
+#define SO_LL                   46
+
 #endif  /* _ASM_POWERPC_SOCKET_H */
diff --git a/arch/s390/include/uapi/asm/socket.h b/arch/s390/include/uapi/asm/socket.h
index 2dacb306835c..0c5105fbaaf3 100644
--- a/arch/s390/include/uapi/asm/socket.h
+++ b/arch/s390/include/uapi/asm/socket.h
@@ -80,4 +80,6 @@
 
 #define SO_SELECT_ERR_QUEUE     45
 
+#define SO_LL                   46
+
 #endif /* _ASM_SOCKET_H */
diff --git a/arch/sparc/include/uapi/asm/socket.h b/arch/sparc/include/uapi/asm/socket.h
index 89f49b68a21c..b46c3fa0b265 100644
--- a/arch/sparc/include/uapi/asm/socket.h
+++ b/arch/sparc/include/uapi/asm/socket.h
@@ -70,6 +70,8 @@
 
 #define SO_SELECT_ERR_QUEUE     0x0029
 
+#define SO_LL                   0x0030
+
 /* 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 a8f44f50e651..b21ace4fc9ba 100644
--- a/arch/xtensa/include/uapi/asm/socket.h
+++ b/arch/xtensa/include/uapi/asm/socket.h
@@ -85,4 +85,6 @@
 
 #define SO_SELECT_ERR_QUEUE     45
 
+#define SO_LL                   46
+
 #endif  /* _XTENSA_SOCKET_H */
diff --git a/include/net/ll_poll.h b/include/net/ll_poll.h
index 6930cbd943e2..fcc7c365cee5 100644
--- a/include/net/ll_poll.h
+++ b/include/net/ll_poll.h
@@ -39,12 +39,12 @@ extern unsigned int sysctl_net_ll_poll __read_mostly;
 /* we can use sched_clock() because we don't care much about precision
  * we only care that the average is bounded
  */
-static inline u64 ll_end_time(void)
+static inline u64 ll_end_time(struct sock *sk)
 {
-        u64 end_time = ACCESS_ONCE(sysctl_net_ll_poll);
+        u64 end_time = ACCESS_ONCE(sk->sk_ll_usec);
 
         /* we don't mind a ~2.5% imprecision
-         * sysctl_net_ll_poll is a u_int so this can't overflow
+         * sk->sk_ll_usec is a u_int so this can't overflow
          */
         end_time = (end_time << 10) + sched_clock();
 
@@ -53,7 +53,7 @@ static inline u64 ll_end_time(void)
 
 static inline bool sk_valid_ll(struct sock *sk)
 {
-        return sysctl_net_ll_poll && sk->sk_napi_id &&
+        return sk->sk_ll_usec && sk->sk_napi_id &&
                !need_resched() && !signal_pending(current);
 }
 
@@ -65,7 +65,7 @@ static inline bool can_poll_ll(u64 end_time)
 static inline bool sk_poll_ll(struct sock *sk, int nonblock)
 {
         const struct net_device_ops *ops;
-        u64 end_time = ll_end_time();
+        u64 end_time = ll_end_time(sk);
         struct napi_struct *napi;
         int rc = false;
 
@@ -118,7 +118,7 @@ static inline void sk_mark_ll(struct sock *sk, struct sk_buff *skb)
 
 #else /* CONFIG_NET_LL_RX_POLL */
 
-static inline u64 ll_end_time(void)
+static inline u64 ll_end_time(struct sock *sk)
 {
         return 0;
 }
diff --git a/include/net/sock.h b/include/net/sock.h
index ac8e1818380c..21db792bffa5 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -230,6 +230,7 @@ struct cg_proto;
   *     @sk_wmem_queued: persistent queue size
   *     @sk_forward_alloc: space allocated forward
   *     @sk_napi_id: id of the last napi context to receive data for sk
+  *     @sk_ll_usec: usecs to busypoll when there is no data
   *     @sk_allocation: allocation mode
   *     @sk_sndbuf: size of send buffer in bytes
   *     @sk_flags: %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE,
@@ -328,6 +329,7 @@ struct sock {
 #endif
 #ifdef CONFIG_NET_LL_RX_POLL
         unsigned int            sk_napi_id;
+        unsigned int            sk_ll_usec;
 #endif
         atomic_t                sk_drops;
         int                     sk_rcvbuf;
diff --git a/include/uapi/asm-generic/socket.h b/include/uapi/asm-generic/socket.h
index c5d2e3a1cf68..ca3a20d772ac 100644
--- a/include/uapi/asm-generic/socket.h
+++ b/include/uapi/asm-generic/socket.h
@@ -76,4 +76,6 @@
 
 #define SO_SELECT_ERR_QUEUE     45
 
+#define SO_LL                   46
+
 #endif /* __ASM_GENERIC_SOCKET_H */
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
 
         /*
diff --git a/net/socket.c b/net/socket.c
index caaffa14e87e..3eec3f76b49c 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -108,7 +108,6 @@
 
 #ifdef CONFIG_NET_LL_RX_POLL
 unsigned int sysctl_net_ll_poll __read_mostly;
-EXPORT_SYMBOL_GPL(sysctl_net_ll_poll);
 #endif
 
 static int sock_no_open(struct inode *irrelevant, struct file *dontcare);