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Diffstat (limited to 'src/dpdk_lib18/librte_pmd_virtio/virtio_ring.h')
| -rwxr-xr-x | src/dpdk_lib18/librte_pmd_virtio/virtio_ring.h | 163 |
1 files changed, 0 insertions, 163 deletions
diff --git a/src/dpdk_lib18/librte_pmd_virtio/virtio_ring.h b/src/dpdk_lib18/librte_pmd_virtio/virtio_ring.h deleted file mode 100755 index a16c4991..00000000 --- a/src/dpdk_lib18/librte_pmd_virtio/virtio_ring.h +++ /dev/null @@ -1,163 +0,0 @@ -/*- - * BSD LICENSE - * - * Copyright(c) 2010-2014 Intel Corporation. All rights reserved. - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * * Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * * Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * * Neither the name of Intel Corporation nor the names of its - * contributors may be used to endorse or promote products derived - * from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#ifndef _VIRTIO_RING_H_ -#define _VIRTIO_RING_H_ - -#include <stdint.h> - -#include <rte_common.h> - -/* This marks a buffer as continuing via the next field. */ -#define VRING_DESC_F_NEXT 1 -/* This marks a buffer as write-only (otherwise read-only). */ -#define VRING_DESC_F_WRITE 2 -/* This means the buffer contains a list of buffer descriptors. */ -#define VRING_DESC_F_INDIRECT 4 - -/* The Host uses this in used->flags to advise the Guest: don't kick me - * when you add a buffer. It's unreliable, so it's simply an - * optimization. Guest will still kick if it's out of buffers. */ -#define VRING_USED_F_NO_NOTIFY 1 -/* The Guest uses this in avail->flags to advise the Host: don't - * interrupt me when you consume a buffer. It's unreliable, so it's - * simply an optimization. */ -#define VRING_AVAIL_F_NO_INTERRUPT 1 - -/* VirtIO ring descriptors: 16 bytes. - * These can chain together via "next". */ -struct vring_desc { - uint64_t addr; /* Address (guest-physical). */ - uint32_t len; /* Length. */ - uint16_t flags; /* The flags as indicated above. */ - uint16_t next; /* We chain unused descriptors via this. */ -}; - -struct vring_avail { - uint16_t flags; - uint16_t idx; - uint16_t ring[0]; -}; - -/* id is a 16bit index. uint32_t is used here for ids for padding reasons. */ -struct vring_used_elem { - /* Index of start of used descriptor chain. */ - uint32_t id; - /* Total length of the descriptor chain which was written to. */ - uint32_t len; -}; - -struct vring_used { - uint16_t flags; - uint16_t idx; - struct vring_used_elem ring[0]; -}; - -struct vring { - unsigned int num; - struct vring_desc *desc; - struct vring_avail *avail; - struct vring_used *used; -}; - -/* The standard layout for the ring is a continuous chunk of memory which - * looks like this. We assume num is a power of 2. - * - * struct vring { - * // The actual descriptors (16 bytes each) - * struct vring_desc desc[num]; - * - * // A ring of available descriptor heads with free-running index. - * __u16 avail_flags; - * __u16 avail_idx; - * __u16 available[num]; - * __u16 used_event_idx; - * - * // Padding to the next align boundary. - * char pad[]; - * - * // A ring of used descriptor heads with free-running index. - * __u16 used_flags; - * __u16 used_idx; - * struct vring_used_elem used[num]; - * __u16 avail_event_idx; - * }; - * - * NOTE: for VirtIO PCI, align is 4096. - */ - -/* - * We publish the used event index at the end of the available ring, and vice - * versa. They are at the end for backwards compatibility. - */ -#define vring_used_event(vr) ((vr)->avail->ring[(vr)->num]) -#define vring_avail_event(vr) (*(uint16_t *)&(vr)->used->ring[(vr)->num]) - -static inline int -vring_size(unsigned int num, unsigned long align) -{ - int size; - - size = num * sizeof(struct vring_desc); - size += sizeof(struct vring_avail) + (num * sizeof(uint16_t)); - size = RTE_ALIGN_CEIL(size, align); - size += sizeof(struct vring_used) + - (num * sizeof(struct vring_used_elem)); - return size; -} - -static inline void -vring_init(struct vring *vr, unsigned int num, uint8_t *p, - unsigned long align) -{ - vr->num = num; - vr->desc = (struct vring_desc *) p; - vr->avail = (struct vring_avail *) (p + - num * sizeof(struct vring_desc)); - vr->used = (void *) - RTE_ALIGN_CEIL((uintptr_t)(&vr->avail->ring[num]), align); -} - -/* - * The following is used with VIRTIO_RING_F_EVENT_IDX. - * Assuming a given event_idx value from the other size, if we have - * just incremented index from old to new_idx, should we trigger an - * event? - */ -static inline int -vring_need_event(uint16_t event_idx, uint16_t new_idx, uint16_t old) -{ - return (uint16_t)(new_idx - event_idx - 1) < (uint16_t)(new_idx - old); -} - -#endif /* _VIRTIO_RING_H_ */ |