[net-next PATCH v2 6/8] net: Commonize busy polling code to focus on napi_id instead of socket

[Alexander Duyck]

From: Sridhar Samudrala <sridhar.samudr...@intel.com>

Move the core functionality in sk_busy_loop() to napi_busy_loop() and
make it independent of sk.

This enables re-using this function in epoll busy loop implementation.

Signed-off-by: Sridhar Samudrala <sridhar.samudr...@intel.com>
Signed-off-by: Alexander Duyck <alexander.h.du...@intel.com>
---
 include/net/busy_poll.h |   20 +++++++++++++++-----
 net/core/dev.c          |   21 ++++++++-------------
 net/core/sock.c         |   11 +++++++++++
 3 files changed, 34 insertions(+), 18 deletions(-)

diff --git a/include/net/busy_poll.h b/include/net/busy_poll.h
index 4626cb22f625..336a874c0fed 100644
--- a/include/net/busy_poll.h
+++ b/include/net/busy_poll.h
@@ -61,7 +61,11 @@ static inline bool sk_can_busy_loop(const struct sock *sk)
        return sk->sk_ll_usec && !signal_pending(current);
 }
 
-void sk_busy_loop(struct sock *sk, int nonblock);
+bool sk_busy_loop_end(void *p, unsigned long start_time);
+
+void napi_busy_loop(unsigned int napi_id,
+                   bool (*loop_end)(void *, unsigned long),
+                   void *loop_end_arg);
 
 #else /* CONFIG_NET_RX_BUSY_POLL */
 static inline unsigned long net_busy_loop_on(void)
@@ -74,10 +78,6 @@ static inline bool sk_can_busy_loop(struct sock *sk)
        return false;
 }
 
-static inline void sk_busy_loop(struct sock *sk, int nonblock)
-{
-}
-
 #endif /* CONFIG_NET_RX_BUSY_POLL */
 
 static inline unsigned long busy_loop_current_time(void)
@@ -121,6 +121,16 @@ static inline bool sk_busy_loop_timeout(struct sock *sk,
        return true;
 }
 
+static inline void sk_busy_loop(struct sock *sk, int nonblock)
+{
+#ifdef CONFIG_NET_RX_BUSY_POLL
+       unsigned int napi_id = READ_ONCE(sk->sk_napi_id);
+
+       if (napi_id >= MIN_NAPI_ID)
+               napi_busy_loop(napi_id, nonblock ? NULL : sk_busy_loop_end, sk);
+#endif
+}
+
 /* used in the NIC receive handler to mark the skb */
 static inline void skb_mark_napi_id(struct sk_buff *skb,
                                    struct napi_struct *napi)
diff --git a/net/core/dev.c b/net/core/dev.c
index 73ebf2f5600e..b082f70e50c5 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5060,20 +5060,17 @@ static void busy_poll_stop(struct napi_struct *napi, 
void *have_poll_lock)
                do_softirq();
 }
 
-void sk_busy_loop(struct sock *sk, int nonblock)
+void napi_busy_loop(unsigned int napi_id,
+                   bool (*loop_end)(void *, unsigned long),
+                   void *loop_end_arg)
 {
-       unsigned long start_time = nonblock ? 0 : busy_loop_current_time();
+       unsigned long start_time = loop_end ? busy_loop_current_time() : 0;
        int (*napi_poll)(struct napi_struct *napi, int budget);
        void *have_poll_lock = NULL;
        struct napi_struct *napi;
-       unsigned int napi_id;
        int work;
 
 restart:
-       napi_id = READ_ONCE(sk->sk_napi_id);
-       if (napi_id < MIN_NAPI_ID)
-               return;
-
        work = 0;
        napi_poll = NULL;
 
@@ -5107,12 +5104,11 @@ void sk_busy_loop(struct sock *sk, int nonblock)
                trace_napi_poll(napi, work, BUSY_POLL_BUDGET);
 count:
                if (work > 0)
-                       __NET_ADD_STATS(sock_net(sk),
+                       __NET_ADD_STATS(dev_net(napi->dev),
                                        LINUX_MIB_BUSYPOLLRXPACKETS, work);
                local_bh_enable();
 
-               if (nonblock || !skb_queue_empty(&sk->sk_receive_queue) ||
-                   sk_busy_loop_timeout(sk, start_time))
+               if (!loop_end || loop_end(loop_end_arg, start_time))
                        break;
 
                if (unlikely(need_resched())) {
@@ -5121,8 +5117,7 @@ void sk_busy_loop(struct sock *sk, int nonblock)
                        preempt_enable();
                        rcu_read_unlock();
                        cond_resched();
-                       if (!skb_queue_empty(&sk->sk_receive_queue) ||
-                           sk_busy_loop_timeout(sk, start_time))
+                       if (loop_end(loop_end_arg, start_time))
                                return;
                        goto restart;
                }
@@ -5134,7 +5129,7 @@ void sk_busy_loop(struct sock *sk, int nonblock)
 out:
        rcu_read_unlock();
 }
-EXPORT_SYMBOL(sk_busy_loop);
+EXPORT_SYMBOL(napi_busy_loop);
 
 #endif /* CONFIG_NET_RX_BUSY_POLL */
 
diff --git a/net/core/sock.c b/net/core/sock.c
index f8c0373a3a74..0aa725cb3dd6 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -3231,3 +3231,14 @@ static int __init proto_init(void)
 subsys_initcall(proto_init);
 
 #endif /* PROC_FS */
+
+#ifdef CONFIG_NET_RX_BUSY_POLL
+bool sk_busy_loop_end(void *p, unsigned long start_time)
+{
+       struct sock *sk = p;
+
+       return !skb_queue_empty(&sk->sk_receive_queue) ||
+              sk_busy_loop_timeout(sk, start_time);
+}
+EXPORT_SYMBOL(sk_busy_loop_end);
+#endif /* CONFIG_NET_RX_BUSY_POLL */