[dpdk-dev] [RFC PATCH 5/8] lib/librte_vhost:dequeue vhost TSO offload

[Ouyang, Changchun]

> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Jijiang Liu
> Sent: Monday, August 31, 2015 5:42 PM
> To: dev at dpdk.org
> Subject: [dpdk-dev] [RFC PATCH 5/8] lib/librte_vhost:dequeue vhost TSO
> offload
> 
> Dequeue vhost TSO offload
> 
> Signed-off-by: Jijiang Liu <jijiang.liu at intel.com>
> ---
>  lib/librte_vhost/vhost_rxtx.c |   29 ++++++++++++++++++++++++++++-
>  1 files changed, 28 insertions(+), 1 deletions(-)
> 
> diff --git a/lib/librte_vhost/vhost_rxtx.c b/lib/librte_vhost/vhost_rxtx.c
> index 0d07338..9adfdb1 100644
> --- a/lib/librte_vhost/vhost_rxtx.c
> +++ b/lib/librte_vhost/vhost_rxtx.c
> @@ -545,6 +545,30 @@ rte_vhost_enqueue_burst(struct virtio_net *dev,
> uint16_t queue_id,
>  		return virtio_dev_rx(dev, queue_id, pkts, count);  }
> 
> +static inline void __attribute__((always_inline))
> +vhost_dequeue_offload(uint64_t addr, struct rte_mbuf *m) {
> +	struct virtio_net_hdr *hdr =
> +		(struct virtio_net_hdr *)((uintptr_t)addr);
> +
> +	if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
> +		switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
> +		case VIRTIO_NET_HDR_GSO_TCPV4:
> +			m->ol_flags |= (PKT_TX_IPV4 | PKT_TX_TCP_SEG);
> +			m->tso_segsz = hdr->gso_size;
> +			break;
> +		case VIRTIO_NET_HDR_GSO_TCPV6:
> +			m->ol_flags |= (PKT_TX_IPV6 | PKT_TX_TCP_SEG);
> +			m->tso_segsz = hdr->gso_size;
> +			break;
> +		default:
> +			RTE_LOG(ERR, VHOST_DATA,
> +				"bad gso type %u.\n", hdr->gso_type);
> +			break;

Do we need special handling for the bad gso type? 

> +		}
> +	}
> +}
> +
>  uint16_t
>  rte_vhost_dequeue_burst(struct virtio_net *dev, uint16_t queue_id,
>  	struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t
> count) @@ -553,6 +577,7 @@ rte_vhost_dequeue_burst(struct virtio_net
> *dev, uint16_t queue_id,
>  	struct vhost_virtqueue *vq;
>  	struct vring_desc *desc;
>  	uint64_t vb_addr = 0;
> +	uint64_t vb_net_hdr_addr = 0;
>  	uint32_t head[MAX_PKT_BURST];
>  	uint32_t used_idx;
>  	uint32_t i;
> @@ -604,6 +629,8 @@ rte_vhost_dequeue_burst(struct virtio_net *dev,
> uint16_t queue_id,
> 
>  		desc = &vq->desc[head[entry_success]];
> 
> +		vb_net_hdr_addr = gpa_to_vva(dev, desc->addr);
> +
>  		/* Discard first buffer as it is the virtio header */
>  		if (desc->flags & VRING_DESC_F_NEXT) {
>  			desc = &vq->desc[desc->next];
> @@ -742,7 +769,7 @@ rte_vhost_dequeue_burst(struct virtio_net *dev,
> uint16_t queue_id,
>  			break;
> 
>  		m->nb_segs = seg_num;
> -
> +		vhost_dequeue_offload(vb_net_hdr_addr, m);
>  		pkts[entry_success] = m;
>  		vq->last_used_idx++;
>  		entry_success++;
> --
> 1.7.7.6