diff options
author | 2017-11-08 14:15:11 +0000 | |
---|---|---|
committer | 2017-11-08 14:45:54 +0000 | |
commit | 055c52583a2794da8ba1e85a48cce3832372b12f (patch) | |
tree | 8ceb1cb78fbb46a0f341f8ee24feb3c6b5540013 /drivers/net/xenvirt/virtqueue.h | |
parent | f239aed5e674965691846e8ce3f187dd47523689 (diff) |
New upstream version 17.11-rc3
Change-Id: I6a5baa40612fe0c20f30b5fa773a6cbbac63a685
Signed-off-by: Luca Boccassi <luca.boccassi@gmail.com>
Diffstat (limited to 'drivers/net/xenvirt/virtqueue.h')
-rw-r--r-- | drivers/net/xenvirt/virtqueue.h | 273 |
1 files changed, 0 insertions, 273 deletions
diff --git a/drivers/net/xenvirt/virtqueue.h b/drivers/net/xenvirt/virtqueue.h deleted file mode 100644 index 1bb6877c..00000000 --- a/drivers/net/xenvirt/virtqueue.h +++ /dev/null @@ -1,273 +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 _VIRTQUEUE_H_ -#define _VIRTQUEUE_H_ - -#include <stdint.h> -#include <linux/virtio_ring.h> -#include <linux/virtio_net.h> - -#include <rte_atomic.h> -#include <rte_memory.h> -#include <rte_memzone.h> -#include <rte_mempool.h> - -#include "virtio_logs.h" - -struct rte_mbuf; - -/* The alignment to use between consumer and producer parts of vring. */ -#define VIRTIO_PCI_VRING_ALIGN 4096 - -enum { VTNET_RQ = 0, VTNET_TQ = 1, VTNET_CQ = 2 }; - -/** - * 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 - -#define VIRTQUEUE_MAX_NAME_SZ 32 - -struct pmd_internals { - struct rte_eth_stats eth_stats; - int port_id; - int virtio_idx; -}; - - -struct virtqueue { - char vq_name[VIRTQUEUE_MAX_NAME_SZ]; - struct rte_mempool *mpool; /**< mempool for mbuf allocation */ - uint16_t queue_id; /**< DPDK queue index. */ - uint16_t vq_queue_index; /**< PCI queue index */ - uint8_t port_id; /**< Device port identifier. */ - - void *vq_ring_virt_mem; /**< virtual address of vring*/ - int vq_alignment; - int vq_ring_size; - - struct vring vq_ring; /**< vring keeping desc, used and avail */ - struct pmd_internals *internals; /**< virtio device internal info. */ - uint16_t vq_nentries; /**< vring desc numbers */ - uint16_t vq_desc_head_idx; - uint16_t vq_free_cnt; /**< num of desc available */ - uint16_t vq_used_cons_idx; /**< Last consumed desc in used table, trails vq_ring.used->idx*/ - - struct vq_desc_extra { - void *cookie; - uint16_t ndescs; - } vq_descx[0] __rte_cache_aligned; -}; - - -#ifdef RTE_LIBRTE_XENVIRT_DEBUG_DUMP -#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); \ - PMD_INIT_LOG(DEBUG, \ - "VQ: %s - 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\n", \ - (vq)->vq_name, (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) -#else -#define VIRTQUEUE_DUMP(vq) do { } while (0) -#endif - - -/** - * Dump virtqueue internal structures, for debug purpose only. - */ -void virtqueue_dump(struct virtqueue *vq); - -/** - * Get all mbufs to be freed. - */ -struct rte_mbuf * virtqueue_detatch_unused(struct virtqueue *vq); - -static __rte_always_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 __rte_always_inline void -vq_ring_update_avail(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_ring.avail->idx & (vq->vq_nentries - 1)); - vq->vq_ring.avail->ring[avail_idx] = desc_idx; - rte_smp_wmb(); - vq->vq_ring.avail->idx++; -} - -static __rte_always_inline void -vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx) -{ - struct vring_desc *dp; - struct vq_desc_extra *dxp; - - dp = &vq->vq_ring.desc[desc_idx]; - dxp = &vq->vq_descx[desc_idx]; - vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt + dxp->ndescs); - while (dp->flags & VRING_DESC_F_NEXT) { - dp = &vq->vq_ring.desc[dp->next]; - } - dxp->ndescs = 0; - - /* - * We must append the existing free chain, if any, to the end of - * newly freed chain. If the virtqueue was completely used, then - * head would be VQ_RING_DESC_CHAIN_END (ASSERTed above). - */ - dp->next = vq->vq_desc_head_idx; - vq->vq_desc_head_idx = desc_idx; -} - -static __rte_always_inline int -virtqueue_enqueue_recv_refill(struct virtqueue *rxvq, struct rte_mbuf *cookie) -{ - const uint16_t needed = 1; - const uint16_t head_idx = rxvq->vq_desc_head_idx; - struct vring_desc *start_dp = rxvq->vq_ring.desc; - struct vq_desc_extra *dxp; - - if (unlikely(rxvq->vq_free_cnt == 0)) - return -ENOSPC; - if (unlikely(rxvq->vq_free_cnt < needed)) - return -EMSGSIZE; - if (unlikely(head_idx >= rxvq->vq_nentries)) - return -EFAULT; - - dxp = &rxvq->vq_descx[head_idx]; - dxp->cookie = (void *)cookie; - dxp->ndescs = needed; - - start_dp[head_idx].addr = - (uint64_t) ((uintptr_t)cookie->buf_addr + RTE_PKTMBUF_HEADROOM - sizeof(struct virtio_net_hdr)); - start_dp[head_idx].len = cookie->buf_len - RTE_PKTMBUF_HEADROOM + sizeof(struct virtio_net_hdr); - start_dp[head_idx].flags = VRING_DESC_F_WRITE; - rxvq->vq_desc_head_idx = start_dp[head_idx].next; - rxvq->vq_free_cnt = (uint16_t)(rxvq->vq_free_cnt - needed); - vq_ring_update_avail(rxvq, head_idx); - - return 0; -} - -static __rte_always_inline int -virtqueue_enqueue_xmit(struct virtqueue *txvq, struct rte_mbuf *cookie) -{ - - const uint16_t needed = 2; - struct vring_desc *start_dp = txvq->vq_ring.desc; - uint16_t head_idx = txvq->vq_desc_head_idx; - uint16_t idx = head_idx; - struct vq_desc_extra *dxp; - - if (unlikely(txvq->vq_free_cnt == 0)) - return -ENOSPC; - if (unlikely(txvq->vq_free_cnt < needed)) - return -EMSGSIZE; - if (unlikely(head_idx >= txvq->vq_nentries)) - return -EFAULT; - - dxp = &txvq->vq_descx[idx]; - dxp->cookie = (void *)cookie; - dxp->ndescs = needed; - - start_dp = txvq->vq_ring.desc; - start_dp[idx].addr = 0; -/* - * TODO: save one desc here? - */ - start_dp[idx].len = sizeof(struct virtio_net_hdr); - start_dp[idx].flags = VRING_DESC_F_NEXT; - start_dp[idx].addr = (uintptr_t)NULL; - idx = start_dp[idx].next; - start_dp[idx].addr = (uint64_t)rte_pktmbuf_mtod(cookie, uintptr_t); - start_dp[idx].len = cookie->data_len; - start_dp[idx].flags = 0; - idx = start_dp[idx].next; - txvq->vq_desc_head_idx = idx; - txvq->vq_free_cnt = (uint16_t)(txvq->vq_free_cnt - needed); - vq_ring_update_avail(txvq, head_idx); - - return 0; -} - -static __rte_always_inline uint16_t -virtqueue_dequeue_burst(struct virtqueue *vq, struct rte_mbuf **rx_pkts, uint32_t *len, uint16_t num) -{ - struct vring_used_elem *uep; - struct rte_mbuf *cookie; - uint16_t used_idx, desc_idx; - uint16_t i; - /* Caller does the check */ - for (i = 0; i < num ; i ++) { - used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1)); - uep = &vq->vq_ring.used->ring[used_idx]; - desc_idx = (uint16_t) uep->id; - cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie; - if (unlikely(cookie == NULL)) { - PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u\n", - vq->vq_used_cons_idx); - RTE_LOG(ERR, PMD, "%s: inconsistent (%u, %u)\n", __func__, used_idx , desc_idx); - break; - } - len[i] = uep->len; - rx_pkts[i] = cookie; - vq->vq_used_cons_idx++; - vq_ring_free_chain(vq, desc_idx); - vq->vq_descx[desc_idx].cookie = NULL; - } - return i; -} - -#endif /* _VIRTQUEUE_H_ */ |