From: Jens Freimann Date: Mon, 17 Dec 2018 21:31:34 +0000 (+0100) Subject: net/virtio: implement Tx path for packed queues X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=892dc798fa9c;p=dpdk.git net/virtio: implement Tx path for packed queues This implements the transmit path for devices with support for packed virtqueues. Signed-off-by: Jens Freimann Signed-off-by: Tiwei Bie Reviewed-by: Maxime Coquelin --- diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c index e6ba1282be..53dcbb75f0 100644 --- a/drivers/net/virtio/virtio_ethdev.c +++ b/drivers/net/virtio/virtio_ethdev.c @@ -390,6 +390,9 @@ virtio_init_queue(struct rte_eth_dev *dev, uint16_t vtpci_queue_idx) if (vtpci_packed_queue(hw)) { vq->avail_wrap_counter = 1; vq->used_wrap_counter = 1; + vq->avail_used_flags = + VRING_DESC_F_AVAIL(vq->avail_wrap_counter) | + VRING_DESC_F_USED(!vq->avail_wrap_counter); } /* @@ -497,17 +500,26 @@ virtio_init_queue(struct rte_eth_dev *dev, uint16_t vtpci_queue_idx) memset(txr, 0, vq_size * sizeof(*txr)); for (i = 0; i < vq_size; i++) { struct vring_desc *start_dp = txr[i].tx_indir; - - vring_desc_init_split(start_dp, - RTE_DIM(txr[i].tx_indir)); + struct vring_packed_desc *start_dp_packed = + txr[i].tx_indir_pq; /* first indirect descriptor is always the tx header */ - start_dp->addr = txvq->virtio_net_hdr_mem - + i * sizeof(*txr) - + offsetof(struct virtio_tx_region, tx_hdr); - - start_dp->len = hw->vtnet_hdr_size; - start_dp->flags = VRING_DESC_F_NEXT; + if (vtpci_packed_queue(hw)) { + start_dp_packed->addr = txvq->virtio_net_hdr_mem + + i * sizeof(*txr) + + offsetof(struct virtio_tx_region, + tx_hdr); + start_dp_packed->len = hw->vtnet_hdr_size; + } else { + vring_desc_init_split(start_dp, + RTE_DIM(txr[i].tx_indir)); + start_dp->addr = txvq->virtio_net_hdr_mem + + i * sizeof(*txr) + + offsetof(struct virtio_tx_region, + tx_hdr); + start_dp->len = hw->vtnet_hdr_size; + start_dp->flags = VRING_DESC_F_NEXT; + } } } @@ -1336,6 +1348,23 @@ set_rxtx_funcs(struct rte_eth_dev *eth_dev) { struct virtio_hw *hw = eth_dev->data->dev_private; + if (vtpci_packed_queue(hw)) { + PMD_INIT_LOG(INFO, + "virtio: using packed ring standard Tx path on port %u", + eth_dev->data->port_id); + eth_dev->tx_pkt_burst = virtio_xmit_pkts_packed; + } else { + if (hw->use_inorder_tx) { + PMD_INIT_LOG(INFO, "virtio: using inorder Tx path on port %u", + eth_dev->data->port_id); + eth_dev->tx_pkt_burst = virtio_xmit_pkts_inorder; + } else { + PMD_INIT_LOG(INFO, "virtio: using standard Tx path on port %u", + eth_dev->data->port_id); + eth_dev->tx_pkt_burst = virtio_xmit_pkts; + } + } + if (hw->use_simple_rx) { PMD_INIT_LOG(INFO, "virtio: using simple Rx path on port %u", eth_dev->data->port_id); @@ -1356,15 +1385,6 @@ set_rxtx_funcs(struct rte_eth_dev *eth_dev) eth_dev->rx_pkt_burst = &virtio_recv_pkts; } - if (hw->use_inorder_tx) { - PMD_INIT_LOG(INFO, "virtio: using inorder Tx path on port %u", - eth_dev->data->port_id); - eth_dev->tx_pkt_burst = virtio_xmit_pkts_inorder; - } else { - PMD_INIT_LOG(INFO, "virtio: using standard Tx path on port %u", - eth_dev->data->port_id); - eth_dev->tx_pkt_burst = virtio_xmit_pkts; - } } /* Only support 1:1 queue/interrupt mapping so far. diff --git a/drivers/net/virtio/virtio_ethdev.h b/drivers/net/virtio/virtio_ethdev.h index e0f80e5a48..05d3551804 100644 --- a/drivers/net/virtio/virtio_ethdev.h +++ b/drivers/net/virtio/virtio_ethdev.h @@ -82,6 +82,8 @@ uint16_t virtio_recv_mergeable_pkts_inorder(void *rx_queue, uint16_t virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts); +uint16_t virtio_xmit_pkts_packed(void *tx_queue, struct rte_mbuf **tx_pkts, + uint16_t nb_pkts); uint16_t virtio_xmit_pkts_inorder(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts); diff --git a/drivers/net/virtio/virtio_rxtx.c b/drivers/net/virtio/virtio_rxtx.c index cb8f89f185..9cc7ad2d0c 100644 --- a/drivers/net/virtio/virtio_rxtx.c +++ b/drivers/net/virtio/virtio_rxtx.c @@ -88,6 +88,23 @@ vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx) dp->next = VQ_RING_DESC_CHAIN_END; } +static void +vq_ring_free_id_packed(struct virtqueue *vq, uint16_t id) +{ + struct vq_desc_extra *dxp; + + dxp = &vq->vq_descx[id]; + vq->vq_free_cnt += dxp->ndescs; + + if (vq->vq_desc_tail_idx == VQ_RING_DESC_CHAIN_END) + vq->vq_desc_head_idx = id; + else + vq->vq_descx[vq->vq_desc_tail_idx].next = id; + + vq->vq_desc_tail_idx = id; + dxp->next = VQ_RING_DESC_CHAIN_END; +} + static uint16_t virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts, uint32_t *len, uint16_t num) @@ -165,6 +182,33 @@ virtqueue_dequeue_rx_inorder(struct virtqueue *vq, #endif /* Cleanup from completed transmits. */ +static void +virtio_xmit_cleanup_packed(struct virtqueue *vq, int num) +{ + uint16_t used_idx, id; + uint16_t size = vq->vq_nentries; + struct vring_packed_desc *desc = vq->ring_packed.desc_packed; + struct vq_desc_extra *dxp; + + used_idx = vq->vq_used_cons_idx; + while (num-- && desc_is_used(&desc[used_idx], vq)) { + used_idx = vq->vq_used_cons_idx; + id = desc[used_idx].id; + dxp = &vq->vq_descx[id]; + vq->vq_used_cons_idx += dxp->ndescs; + if (vq->vq_used_cons_idx >= size) { + vq->vq_used_cons_idx -= size; + vq->used_wrap_counter ^= 1; + } + vq_ring_free_id_packed(vq, id); + if (dxp->cookie != NULL) { + rte_pktmbuf_free(dxp->cookie); + dxp->cookie = NULL; + } + used_idx = vq->vq_used_cons_idx; + } +} + static void virtio_xmit_cleanup(struct virtqueue *vq, uint16_t num) { @@ -456,6 +500,107 @@ virtqueue_enqueue_xmit_inorder(struct virtnet_tx *txvq, vq->vq_desc_head_idx = idx & (vq->vq_nentries - 1); } +static inline void +virtqueue_enqueue_xmit_packed(struct virtnet_tx *txvq, struct rte_mbuf *cookie, + uint16_t needed, int can_push) +{ + struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr; + struct vq_desc_extra *dxp; + struct virtqueue *vq = txvq->vq; + struct vring_packed_desc *start_dp, *head_dp; + uint16_t idx, id, head_idx, head_flags; + uint16_t head_size = vq->hw->vtnet_hdr_size; + struct virtio_net_hdr *hdr; + uint16_t prev; + + id = vq->vq_desc_head_idx; + + dxp = &vq->vq_descx[id]; + dxp->ndescs = needed; + dxp->cookie = cookie; + + head_idx = vq->vq_avail_idx; + idx = head_idx; + prev = head_idx; + start_dp = vq->ring_packed.desc_packed; + + head_dp = &vq->ring_packed.desc_packed[idx]; + head_flags = cookie->next ? VRING_DESC_F_NEXT : 0; + head_flags |= vq->avail_used_flags; + + if (can_push) { + /* prepend cannot fail, checked by caller */ + hdr = (struct virtio_net_hdr *) + rte_pktmbuf_prepend(cookie, head_size); + /* rte_pktmbuf_prepend() counts the hdr size to the pkt length, + * which is wrong. Below subtract restores correct pkt size. + */ + cookie->pkt_len -= head_size; + + /* if offload disabled, it is not zeroed below, do it now */ + if (!vq->hw->has_tx_offload) { + ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0); + ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0); + ASSIGN_UNLESS_EQUAL(hdr->flags, 0); + ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0); + ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0); + ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0); + } + } else { + /* setup first tx ring slot to point to header + * stored in reserved region. + */ + start_dp[idx].addr = txvq->virtio_net_hdr_mem + + RTE_PTR_DIFF(&txr[idx].tx_hdr, txr); + start_dp[idx].len = vq->hw->vtnet_hdr_size; + hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr; + idx++; + if (idx >= vq->vq_nentries) { + idx -= vq->vq_nentries; + vq->avail_wrap_counter ^= 1; + vq->avail_used_flags = + VRING_DESC_F_AVAIL(vq->avail_wrap_counter) | + VRING_DESC_F_USED(!vq->avail_wrap_counter); + } + } + + virtqueue_xmit_offload(hdr, cookie, vq->hw->has_tx_offload); + + do { + uint16_t flags; + + start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq); + start_dp[idx].len = cookie->data_len; + if (likely(idx != head_idx)) { + flags = cookie->next ? VRING_DESC_F_NEXT : 0; + flags |= vq->avail_used_flags; + start_dp[idx].flags = flags; + } + prev = idx; + idx++; + if (idx >= vq->vq_nentries) { + idx -= vq->vq_nentries; + vq->avail_wrap_counter ^= 1; + vq->avail_used_flags = + VRING_DESC_F_AVAIL(vq->avail_wrap_counter) | + VRING_DESC_F_USED(!vq->avail_wrap_counter); + } + } while ((cookie = cookie->next) != NULL); + + start_dp[prev].id = id; + + vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed); + + vq->vq_desc_head_idx = dxp->next; + if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END) + vq->vq_desc_tail_idx = VQ_RING_DESC_CHAIN_END; + + vq->vq_avail_idx = idx; + + rte_smp_wmb(); + head_dp->flags = head_flags; +} + static inline void virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie, uint16_t needed, int use_indirect, int can_push, @@ -733,8 +878,10 @@ virtio_dev_tx_queue_setup_finish(struct rte_eth_dev *dev, PMD_INIT_FUNC_TRACE(); - if (hw->use_inorder_tx) - vq->vq_ring.desc[vq->vq_nentries - 1].next = 0; + if (!vtpci_packed_queue(hw)) { + if (hw->use_inorder_tx) + vq->vq_ring.desc[vq->vq_nentries - 1].next = 0; + } VIRTQUEUE_DUMP(vq); @@ -1346,6 +1493,91 @@ virtio_recv_mergeable_pkts(void *rx_queue, return nb_rx; } +uint16_t +virtio_xmit_pkts_packed(void *tx_queue, struct rte_mbuf **tx_pkts, + uint16_t nb_pkts) +{ + struct virtnet_tx *txvq = tx_queue; + struct virtqueue *vq = txvq->vq; + struct virtio_hw *hw = vq->hw; + uint16_t hdr_size = hw->vtnet_hdr_size; + uint16_t nb_tx = 0; + int error; + + if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts)) + return nb_tx; + + if (unlikely(nb_pkts < 1)) + return nb_pkts; + + PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts); + + if (nb_pkts > vq->vq_free_cnt) + virtio_xmit_cleanup_packed(vq, nb_pkts - vq->vq_free_cnt); + + for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) { + struct rte_mbuf *txm = tx_pkts[nb_tx]; + int can_push = 0, slots, need; + + /* Do VLAN tag insertion */ + if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) { + error = rte_vlan_insert(&txm); + if (unlikely(error)) { + rte_pktmbuf_free(txm); + continue; + } + } + + /* optimize ring usage */ + if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) || + vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) && + rte_mbuf_refcnt_read(txm) == 1 && + RTE_MBUF_DIRECT(txm) && + txm->nb_segs == 1 && + rte_pktmbuf_headroom(txm) >= hdr_size && + rte_is_aligned(rte_pktmbuf_mtod(txm, char *), + __alignof__(struct virtio_net_hdr_mrg_rxbuf))) + can_push = 1; + + /* How many main ring entries are needed to this Tx? + * any_layout => number of segments + * default => number of segments + 1 + */ + slots = txm->nb_segs + !can_push; + need = slots - vq->vq_free_cnt; + + /* Positive value indicates it need free vring descriptors */ + if (unlikely(need > 0)) { + virtio_rmb(); + need = RTE_MIN(need, (int)nb_pkts); + virtio_xmit_cleanup_packed(vq, need); + need = slots - vq->vq_free_cnt; + if (unlikely(need > 0)) { + PMD_TX_LOG(ERR, + "No free tx descriptors to transmit"); + break; + } + } + + /* Enqueue Packet buffers */ + virtqueue_enqueue_xmit_packed(txvq, txm, slots, can_push); + + txvq->stats.bytes += txm->pkt_len; + virtio_update_packet_stats(&txvq->stats, txm); + } + + txvq->stats.packets += nb_tx; + + if (likely(nb_tx)) { + if (unlikely(virtqueue_kick_prepare_packed(vq))) { + virtqueue_notify(vq); + PMD_TX_LOG(DEBUG, "Notified backend after xmit"); + } + } + + return nb_tx; +} + uint16_t virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts) { diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h index ed99dfef26..d8ae5cdec4 100644 --- a/drivers/net/virtio/virtqueue.h +++ b/drivers/net/virtio/virtqueue.h @@ -247,8 +247,12 @@ struct virtio_net_hdr_mrg_rxbuf { #define VIRTIO_MAX_TX_INDIRECT 8 struct virtio_tx_region { struct virtio_net_hdr_mrg_rxbuf tx_hdr; - struct vring_desc tx_indir[VIRTIO_MAX_TX_INDIRECT] - __attribute__((__aligned__(16))); + union { + struct vring_desc tx_indir[VIRTIO_MAX_TX_INDIRECT] + __attribute__((__aligned__(16))); + struct vring_packed_desc tx_indir_pq[VIRTIO_MAX_TX_INDIRECT] + __attribute__((__aligned__(16))); + }; }; static inline int @@ -380,6 +384,7 @@ virtio_get_queue_type(struct virtio_hw *hw, uint16_t vtpci_queue_idx) #define VIRTQUEUE_NUSED(vq) ((uint16_t)((vq)->vq_ring.used->idx - (vq)->vq_used_cons_idx)) void vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx); +void vq_ring_free_chain_packed(struct virtqueue *vq, uint16_t used_idx); void vq_ring_free_inorder(struct virtqueue *vq, uint16_t desc_idx, uint16_t num); @@ -413,6 +418,17 @@ virtqueue_kick_prepare(struct virtqueue *vq) return !(vq->vq_ring.used->flags & VRING_USED_F_NO_NOTIFY); } +static inline int +virtqueue_kick_prepare_packed(struct virtqueue *vq) +{ + uint16_t flags; + + virtio_mb(); + flags = vq->ring_packed.device_event->desc_event_flags; + + return flags != RING_EVENT_FLAGS_DISABLE; +} + static inline void virtqueue_notify(struct virtqueue *vq) {