virtio: add VIRTIO_RING_NO_LEGACY

Add macro to disable legacy vring functions.

Matej Genci committed 7 years ago

Commit e7c8cc31 parent 3d77e6a2 files · +5 −0Browse files

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include/uapi/linux/virtio_ring.h+4−0

@@ -135,6 +135,8 @@ struct vring { · 134 unmodified lines
135	135	#define VRING_USED_ALIGN_SIZE 4
136	136	#define VRING_DESC_ALIGN_SIZE 16
137	137
	138	+#ifndef VIRTIO_RING_NO_LEGACY
	139	+
138	140	/* The standard layout for the ring is a continuous chunk of memory which looks
139	141	* like this. We assume num is a power of 2.
140	142	*
@@ -181,6 +183,8 @@ static inline unsigned vring_size(unsigned int num, unsigned long align) · 40 unmodified lines
181	183	+ sizeof(__virtio16) * 3 + sizeof(struct vring_used_elem) * num;
182	184	}
183	185
	186	+#endif /* VIRTIO_RING_NO_LEGACY */
	187	+
184	188	/* The following is used with USED_EVENT_IDX and AVAIL_EVENT_IDX */
185	189	/* Assuming a given event_idx value from the other side, if
186	190	* we have just incremented index from old to new_idx,