linux-toradex.git/include/linux/ptr_ring.h, branch v4.8-rc1

ptr_ring: support resizing multiple queues

2016-07-01T09:32:17+00:00

Sometimes, we need support resizing multiple queues at once. This is
because it was not easy to recover to recover from a partial failure
of multiple queues resizing.

Signed-off-by: Michael S. Tsirkin 
Signed-off-by: Jason Wang 
Signed-off-by: David S. Miller

ptr_ring: support zero length ring

2016-07-01T09:32:16+00:00

Sometimes, we need zero length ring. But current code will crash since
we don't do any check before accessing the ring. This patch fixes this.

Signed-off-by: Jason Wang 
Signed-off-by: David S. Miller

ptr_ring: resize support

2016-06-15T20:58:27+00:00

This adds ring resize support. Seems to be necessary as
users such as tun allow userspace control over queue size.

If resize is used, this costs us ability to peek at queue without
consumer lock - should not be a big deal as peek and consumer are
usually run on the same CPU.

If ring is made bigger, ring contents is preserved.  If ring is made
smaller, extra pointers are passed to an optional destructor callback.

Cleanup function also gains destructor callback such that
all pointers in queue can be cleaned up.

This changes some APIs but we don't have any users yet,
so it won't break bisect.

Signed-off-by: Michael S. Tsirkin 
Acked-by: Jesper Dangaard Brouer 
Signed-off-by: David S. Miller

ptr_ring: array based FIFO for pointers

2016-06-15T20:57:21+00:00

A simple array based FIFO of pointers.  Intended for net stack which
commonly has a single consumer/producer.

Signed-off-by: Michael S. Tsirkin 
Acked-by: Jesper Dangaard Brouer 
Signed-off-by: David S. Miller