1 files changed, 144 insertions, 0 deletions
diff --git a/include/net/busy_poll.h b/include/net/busy_poll.h
new file mode 100644
index 000000000..36e5e75e7
--- /dev/null
+++ b/include/net/busy_poll.h
@@ -0,0 +1,144 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * net busy poll support
+ * Copyright(c) 2013 Intel Corporation.
+ *
+ * Author: Eliezer Tamir
+ *
+ * Contact Information:
+ * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
+ */
+
+#ifndef _LINUX_NET_BUSY_POLL_H
+#define _LINUX_NET_BUSY_POLL_H
+
+#include <linux/netdevice.h>
+#include <linux/sched/clock.h>
+#include <linux/sched/signal.h>
+#include <net/ip.h>
+
+/*		0 - Reserved to indicate value not set
+ *     1..NR_CPUS - Reserved for sender_cpu
+ *  NR_CPUS+1..~0 - Region available for NAPI IDs
+ */
+#define MIN_NAPI_ID ((unsigned int)(NR_CPUS + 1))
+
+#ifdef CONFIG_NET_RX_BUSY_POLL
+
+struct napi_struct;
+extern unsigned int sysctl_net_busy_read __read_mostly;
+extern unsigned int sysctl_net_busy_poll __read_mostly;
+
+static inline bool net_busy_loop_on(void)
+{
+	return READ_ONCE(sysctl_net_busy_poll);
+}
+
+static inline bool sk_can_busy_loop(const struct sock *sk)
+{
+	return READ_ONCE(sk->sk_ll_usec) && !signal_pending(current);
+}
+
+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)
+{
+	return 0;
+}
+
+static inline bool sk_can_busy_loop(struct sock *sk)
+{
+	return false;
+}
+
+#endif /* CONFIG_NET_RX_BUSY_POLL */
+
+static inline unsigned long busy_loop_current_time(void)
+{
+#ifdef CONFIG_NET_RX_BUSY_POLL
+	return (unsigned long)(local_clock() >> 10);
+#else
+	return 0;
+#endif
+}
+
+/* in poll/select we use the global sysctl_net_ll_poll value */
+static inline bool busy_loop_timeout(unsigned long start_time)
+{
+#ifdef CONFIG_NET_RX_BUSY_POLL
+	unsigned long bp_usec = READ_ONCE(sysctl_net_busy_poll);
+
+	if (bp_usec) {
+		unsigned long end_time = start_time + bp_usec;
+		unsigned long now = busy_loop_current_time();
+
+		return time_after(now, end_time);
+	}
+#endif
+	return true;
+}
+
+static inline bool sk_busy_loop_timeout(struct sock *sk,
+					unsigned long start_time)
+{
+#ifdef CONFIG_NET_RX_BUSY_POLL
+	unsigned long bp_usec = READ_ONCE(sk->sk_ll_usec);
+
+	if (bp_usec) {
+		unsigned long end_time = start_time + bp_usec;
+		unsigned long now = busy_loop_current_time();
+
+		return time_after(now, end_time);
+	}
+#endif
+	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)
+{
+#ifdef CONFIG_NET_RX_BUSY_POLL
+	/* If the skb was already marked with a valid NAPI ID, avoid overwriting
+	 * it.
+	 */
+	if (skb->napi_id < MIN_NAPI_ID)
+		skb->napi_id = napi->napi_id;
+#endif
+}
+
+/* used in the protocol hanlder to propagate the napi_id to the socket */
+static inline void sk_mark_napi_id(struct sock *sk, const struct sk_buff *skb)
+{
+#ifdef CONFIG_NET_RX_BUSY_POLL
+	WRITE_ONCE(sk->sk_napi_id, skb->napi_id);
+#endif
+	sk_rx_queue_set(sk, skb);
+}
+
+/* variant used for unconnected sockets */
+static inline void sk_mark_napi_id_once(struct sock *sk,
+					const struct sk_buff *skb)
+{
+#ifdef CONFIG_NET_RX_BUSY_POLL
+	if (!READ_ONCE(sk->sk_napi_id))
+		WRITE_ONCE(sk->sk_napi_id, skb->napi_id);
+#endif
+}
+
+#endif /* _LINUX_NET_BUSY_POLL_H */