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-rw-r--r--include/net/busy_poll.h183
1 files changed, 183 insertions, 0 deletions
diff --git a/include/net/busy_poll.h b/include/net/busy_poll.h
new file mode 100644
index 000000000000..76f034087743
--- /dev/null
+++ b/include/net/busy_poll.h
@@ -0,0 +1,183 @@
+/*
+ * Low Latency Sockets
+ * Copyright(c) 2013 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Author: Eliezer Tamir
+ *
+ * Contact Information:
+ * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
+ */
+
+#ifndef _LINUX_NET_LL_POLL_H
+#define _LINUX_NET_LL_POLL_H
+
+#include <linux/netdevice.h>
+#include <net/ip.h>
+
+#ifdef CONFIG_NET_LL_RX_POLL
+
+struct napi_struct;
+extern unsigned int sysctl_net_ll_read __read_mostly;
+extern unsigned int sysctl_net_ll_poll __read_mostly;
+
+/* return values from ndo_ll_poll */
+#define LL_FLUSH_FAILED -1
+#define LL_FLUSH_BUSY -2
+
+static inline bool net_busy_loop_on(void)
+{
+ return sysctl_net_ll_poll;
+}
+
+/* a wrapper to make debug_smp_processor_id() happy
+ * we can use sched_clock() because we don't care much about precision
+ * we only care that the average is bounded
+ */
+#ifdef CONFIG_DEBUG_PREEMPT
+static inline u64 busy_loop_us_clock(void)
+{
+ u64 rc;
+
+ preempt_disable_notrace();
+ rc = sched_clock();
+ preempt_enable_no_resched_notrace();
+
+ return rc >> 10;
+}
+#else /* CONFIG_DEBUG_PREEMPT */
+static inline u64 busy_loop_us_clock(void)
+{
+ return sched_clock() >> 10;
+}
+#endif /* CONFIG_DEBUG_PREEMPT */
+
+static inline unsigned long sk_busy_loop_end_time(struct sock *sk)
+{
+ return busy_loop_us_clock() + ACCESS_ONCE(sk->sk_ll_usec);
+}
+
+/* in poll/select we use the global sysctl_net_ll_poll value */
+static inline unsigned long busy_loop_end_time(void)
+{
+ return busy_loop_us_clock() + ACCESS_ONCE(sysctl_net_ll_poll);
+}
+
+static inline bool sk_can_busy_loop(struct sock *sk)
+{
+ return sk->sk_ll_usec && sk->sk_napi_id &&
+ !need_resched() && !signal_pending(current);
+}
+
+
+static inline bool busy_loop_timeout(unsigned long end_time)
+{
+ unsigned long now = busy_loop_us_clock();
+
+ return time_after(now, end_time);
+}
+
+/* when used in sock_poll() nonblock is known at compile time to be true
+ * so the loop and end_time will be optimized out
+ */
+static inline bool sk_busy_loop(struct sock *sk, int nonblock)
+{
+ unsigned long end_time = !nonblock ? sk_busy_loop_end_time(sk) : 0;
+ const struct net_device_ops *ops;
+ struct napi_struct *napi;
+ int rc = false;
+
+ /*
+ * rcu read lock for napi hash
+ * bh so we don't race with net_rx_action
+ */
+ rcu_read_lock_bh();
+
+ napi = napi_by_id(sk->sk_napi_id);
+ if (!napi)
+ goto out;
+
+ ops = napi->dev->netdev_ops;
+ if (!ops->ndo_ll_poll)
+ goto out;
+
+ do {
+ rc = ops->ndo_ll_poll(napi);
+
+ if (rc == LL_FLUSH_FAILED)
+ break; /* permanent failure */
+
+ if (rc > 0)
+ /* local bh are disabled so it is ok to use _BH */
+ NET_ADD_STATS_BH(sock_net(sk),
+ LINUX_MIB_LOWLATENCYRXPACKETS, rc);
+
+ } while (!nonblock && skb_queue_empty(&sk->sk_receive_queue) &&
+ !need_resched() && !busy_loop_timeout(end_time));
+
+ rc = !skb_queue_empty(&sk->sk_receive_queue);
+out:
+ rcu_read_unlock_bh();
+ return rc;
+}
+
+/* used in the NIC receive handler to mark the skb */
+static inline void skb_mark_ll(struct sk_buff *skb, struct napi_struct *napi)
+{
+ skb->napi_id = napi->napi_id;
+}
+
+/* used in the protocol hanlder to propagate the napi_id to the socket */
+static inline void sk_mark_ll(struct sock *sk, struct sk_buff *skb)
+{
+ sk->sk_napi_id = skb->napi_id;
+}
+
+#else /* CONFIG_NET_LL_RX_POLL */
+static inline unsigned long net_busy_loop_on(void)
+{
+ return 0;
+}
+
+static inline unsigned long busy_loop_end_time(void)
+{
+ return 0;
+}
+
+static inline bool sk_can_busy_loop(struct sock *sk)
+{
+ return false;
+}
+
+static inline bool sk_busy_poll(struct sock *sk, int nonblock)
+{
+ return false;
+}
+
+static inline void skb_mark_ll(struct sk_buff *skb, struct napi_struct *napi)
+{
+}
+
+static inline void sk_mark_ll(struct sock *sk, struct sk_buff *skb)
+{
+}
+
+static inline bool busy_loop_timeout(unsigned long end_time)
+{
+ return true;
+}
+
+#endif /* CONFIG_NET_LL_RX_POLL */
+#endif /* _LINUX_NET_LL_POLL_H */