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[PATCH V2 net-next 1/7] ptr_ring: introduce batch dequeuing

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This patch introduce a batched version of consuming, consumer can
dequeue more than one pointers from the ring at a time. We don't care
about the reorder of reading here so no need for compiler barrier.

Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 include/linux/ptr_ring.h | 65 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)

diff --git a/include/linux/ptr_ring.h b/include/linux/ptr_ring.h
index 6c70444..2be0f350 100644
--- a/include/linux/ptr_ring.h
+++ b/include/linux/ptr_ring.h
@@ -247,6 +247,22 @@ static inline void *__ptr_ring_consume(struct ptr_ring *r)
 	return ptr;
 }
 
+static inline int __ptr_ring_consume_batched(struct ptr_ring *r,
+					     void **array, int n)
+{
+	void *ptr;
+	int i;
+
+	for (i = 0; i < n; i++) {
+		ptr = __ptr_ring_consume(r);
+		if (!ptr)
+			break;
+		array[i] = ptr;
+	}
+
+	return i;
+}
+
 /*
  * Note: resize (below) nests producer lock within consumer lock, so if you
  * call this in interrupt or BH context, you must disable interrupts/BH when
@@ -297,6 +313,55 @@ static inline void *ptr_ring_consume_bh(struct ptr_ring *r)
 	return ptr;
 }
 
+static inline int ptr_ring_consume_batched(struct ptr_ring *r,
+					   void **array, int n)
+{
+	int ret;
+
+	spin_lock(&r->consumer_lock);
+	ret = __ptr_ring_consume_batched(r, array, n);
+	spin_unlock(&r->consumer_lock);
+
+	return ret;
+}
+
+static inline int ptr_ring_consume_batched_irq(struct ptr_ring *r,
+					       void **array, int n)
+{
+	int ret;
+
+	spin_lock_irq(&r->consumer_lock);
+	ret = __ptr_ring_consume_batched(r, array, n);
+	spin_unlock_irq(&r->consumer_lock);
+
+	return ret;
+}
+
+static inline int ptr_ring_consume_batched_any(struct ptr_ring *r,
+					       void **array, int n)
+{
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&r->consumer_lock, flags);
+	ret = __ptr_ring_consume_batched(r, array, n);
+	spin_unlock_irqrestore(&r->consumer_lock, flags);
+
+	return ret;
+}
+
+static inline int ptr_ring_consume_batched_bh(struct ptr_ring *r,
+					      void **array, int n)
+{
+	int ret;
+
+	spin_lock_bh(&r->consumer_lock);
+	ret = __ptr_ring_consume_batched(r, array, n);
+	spin_unlock_bh(&r->consumer_lock);
+
+	return ret;
+}
+
 /* Cast to structure type and call a function without discarding from FIFO.
  * Function must return a value.
  * Callers must take consumer_lock.
-- 
2.7.4

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[PATCH V2 net-next 0/7] vhost-net rx batching Jason Wang <jasowang@redhat.com> - 2017-03-30 09:30 +0200
  [PATCH V2 net-next 6/7] tap: support receiving skb from msg_control Jason Wang <jasowang@redhat.com> - 2017-03-30 09:30 +0200
    Re: [PATCH V2 net-next 6/7] tap: support receiving skb from  msg_control "Michael S. Tsirkin" <mst@redhat.com> - 2017-03-30 17:10 +0200
      Re: [PATCH V2 net-next 6/7] tap: support receiving skb from  msg_control Jason Wang <jasowang@redhat.com> - 2017-03-31 06:10 +0200
  [PATCH V2 net-next 1/7] ptr_ring: introduce batch dequeuing Jason Wang <jasowang@redhat.com> - 2017-03-30 09:30 +0200
    Re: [PATCH V2 net-next 1/7] ptr_ring: introduce batch dequeuing "Michael S. Tsirkin" <mst@redhat.com> - 2017-03-30 16:00 +0200
      Re: [PATCH V2 net-next 1/7] ptr_ring: introduce batch dequeuing Jason Wang <jasowang@redhat.com> - 2017-03-31 06:00 +0200
        Re: [PATCH V2 net-next 1/7] ptr_ring: introduce batch dequeuing "Michael S. Tsirkin" <mst@redhat.com> - 2017-03-31 16:40 +0200
          Re: [PATCH V2 net-next 1/7] ptr_ring: introduce batch dequeuing Jason Wang <jasowang@redhat.com> - 2017-04-01 07:20 +0200
  [PATCH V2 net-next 4/7] tap: export skb_array Jason Wang <jasowang@redhat.com> - 2017-03-30 09:30 +0200
  [PATCH V2 net-next 3/7] tun: export skb_array Jason Wang <jasowang@redhat.com> - 2017-03-30 09:30 +0200
  [PATCH V2 net-next 2/7] skb_array: introduce batch dequeuing Jason Wang <jasowang@redhat.com> - 2017-03-30 09:30 +0200
  [PATCH V2 net-next 7/7] vhost_net: try batch dequing from skb array Jason Wang <jasowang@redhat.com> - 2017-03-30 09:30 +0200
    Re: [PATCH V2 net-next 7/7] vhost_net: try batch dequing from skb  array "Michael S. Tsirkin" <mst@redhat.com> - 2017-03-30 16:30 +0200
      Re: [PATCH V2 net-next 7/7] vhost_net: try batch dequing from skb  array Jason Wang <jasowang@redhat.com> - 2017-03-31 06:10 +0200
        Re: [PATCH V2 net-next 7/7] vhost_net: try batch dequing from skb  array Jason Wang <jasowang@redhat.com> - 2017-03-31 08:50 +0200

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