diff options
Diffstat (limited to 'drivers/crypto/virtio/virtqueue.h')
| -rw-r--r-- | drivers/crypto/virtio/virtqueue.h | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/drivers/crypto/virtio/virtqueue.h b/drivers/crypto/virtio/virtqueue.h new file mode 100644 index 00000000..bf10c657 --- /dev/null +++ b/drivers/crypto/virtio/virtqueue.h @@ -0,0 +1,171 @@ +/* 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_ */ |