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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2018 HUAWEI TECHNOLOGIES CO., LTD.
*/
#ifndef _VIRTQUEUE_H_
#define _VIRTQUEUE_H_
#include <stdint.h>
#include <rte_atomic.h>
#include <rte_memory.h>
#include <rte_memzone.h>
#include <rte_mempool.h>
#include "virtio_pci.h"
#include "virtio_ring.h"
#include "virtio_logs.h"
#include "virtio_crypto.h"
struct rte_mbuf;
/*
* Per virtio_config.h in Linux.
* For virtio_pci on SMP, we don't need to order with respect to MMIO
* accesses through relaxed memory I/O windows, so smp_mb() et al are
* sufficient.
*
*/
#define virtio_mb() rte_smp_mb()
#define virtio_rmb() rte_smp_rmb()
#define virtio_wmb() rte_smp_wmb()
#define VIRTQUEUE_MAX_NAME_SZ 32
enum { VTCRYPTO_DATAQ = 0, VTCRYPTO_CTRLQ = 1 };
/**
* The maximum virtqueue size is 2^15. Use that value as the end of
* descriptor chain terminator since it will never be a valid index
* in the descriptor table. This is used to verify we are correctly
* handling vq_free_cnt.
*/
#define VQ_RING_DESC_CHAIN_END 32768
struct vq_desc_extra {
void *crypto_op;
void *cookie;
uint16_t ndescs;
};
struct virtqueue {
/**< virtio_crypto_hw structure pointer. */
struct virtio_crypto_hw *hw;
/**< mem zone to populate RX ring. */
const struct rte_memzone *mz;
/**< memzone to populate hdr and request. */
struct rte_mempool *mpool;
uint8_t dev_id; /**< Device identifier. */
uint16_t vq_queue_index; /**< PCI queue index */
void *vq_ring_virt_mem; /**< linear address of vring*/
unsigned int vq_ring_size;
phys_addr_t vq_ring_mem; /**< physical address of vring */
struct vring vq_ring; /**< vring keeping desc, used and avail */
uint16_t vq_free_cnt; /**< num of desc available */
uint16_t vq_nentries; /**< vring desc numbers */
/**
* Head of the free chain in the descriptor table. If
* there are no free descriptors, this will be set to
* VQ_RING_DESC_CHAIN_END.
*/
uint16_t vq_desc_head_idx;
uint16_t vq_desc_tail_idx;
/**
* Last consumed descriptor in the used table,
* trails vq_ring.used->idx.
*/
uint16_t vq_used_cons_idx;
uint16_t vq_avail_idx;
/* Statistics */
uint64_t packets_sent_total;
uint64_t packets_sent_failed;
uint64_t packets_received_total;
uint64_t packets_received_failed;
uint16_t *notify_addr;
struct vq_desc_extra vq_descx[0];
};
/**
* Tell the backend not to interrupt us.
*/
void virtqueue_disable_intr(struct virtqueue *vq);
/**
* Get all mbufs to be freed.
*/
void virtqueue_detatch_unused(struct virtqueue *vq);
static inline int
virtqueue_full(const struct virtqueue *vq)
{
return vq->vq_free_cnt == 0;
}
#define VIRTQUEUE_NUSED(vq) \
((uint16_t)((vq)->vq_ring.used->idx - (vq)->vq_used_cons_idx))
static inline void
vq_update_avail_idx(struct virtqueue *vq)
{
virtio_wmb();
vq->vq_ring.avail->idx = vq->vq_avail_idx;
}
static inline void
vq_update_avail_ring(struct virtqueue *vq, uint16_t desc_idx)
{
uint16_t avail_idx;
/*
* Place the head of the descriptor chain into the next slot and make
* it usable to the host. The chain is made available now rather than
* deferring to virtqueue_notify() in the hopes that if the host is
* currently running on another CPU, we can keep it processing the new
* descriptor.
*/
avail_idx = (uint16_t)(vq->vq_avail_idx & (vq->vq_nentries - 1));
if (unlikely(vq->vq_ring.avail->ring[avail_idx] != desc_idx))
vq->vq_ring.avail->ring[avail_idx] = desc_idx;
vq->vq_avail_idx++;
}
static inline int
virtqueue_kick_prepare(struct virtqueue *vq)
{
return !(vq->vq_ring.used->flags & VRING_USED_F_NO_NOTIFY);
}
static inline void
virtqueue_notify(struct virtqueue *vq)
{
/*
* Ensure updated avail->idx is visible to host.
* For virtio on IA, the notificaiton is through io port operation
* which is a serialization instruction itself.
*/
VTPCI_OPS(vq->hw)->notify_queue(vq->hw, vq);
}
/**
* Dump virtqueue internal structures, for debug purpose only.
*/
#define VIRTQUEUE_DUMP(vq) do { \
uint16_t used_idx, nused; \
used_idx = (vq)->vq_ring.used->idx; \
nused = (uint16_t)(used_idx - (vq)->vq_used_cons_idx); \
VIRTIO_CRYPTO_INIT_LOG_DBG(\
"VQ: - size=%d; free=%d; used=%d; desc_head_idx=%d;" \
" avail.idx=%d; used_cons_idx=%d; used.idx=%d;" \
" avail.flags=0x%x; used.flags=0x%x", \
(vq)->vq_nentries, (vq)->vq_free_cnt, nused, \
(vq)->vq_desc_head_idx, (vq)->vq_ring.avail->idx, \
(vq)->vq_used_cons_idx, (vq)->vq_ring.used->idx, \
(vq)->vq_ring.avail->flags, (vq)->vq_ring.used->flags); \
} while (0)
#endif /* _VIRTQUEUE_H_ */
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