[dpdk-dev] [PATCH v4 4/7] virtio: fill RX avail ring with blank mbufs

Tan, Jianfeng jianfeng.tan at intel.com
Fri Oct 23 07:56:56 CEST 2015


On 10/23/2015 1:51 PM, Jianfeng wrote:

> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Huawei Xie
> Sent: Thursday, October 22, 2015 8:10 PM
> To: dev at dpdk.org
> Subject: [dpdk-dev] [PATCH v4 4/7] virtio: fill RX avail ring with blank mbufs
> +int __attribute__((cold))
> +virtqueue_enqueue_recv_refill_simple(struct virtqueue *vq,
> +	struct rte_mbuf *cookie)
> +{
> +	struct vq_desc_extra *dxp;
> +	struct vring_desc *start_dp;
> +	uint16_t desc_idx;
> +
> +	desc_idx = vq->vq_avail_idx & (vq->vq_nentries - 1);
> +	dxp = &vq->vq_descx[desc_idx];
> +	dxp->cookie = (void *)cookie;
> +	vq->sw_ring[desc_idx] = cookie;
> +
> +	start_dp = vq->vq_ring.desc;
> +	start_dp[desc_idx].addr = (uint64_t)((uintptr_t)cookie-
> >buf_physaddr +
> +		RTE_PKTMBUF_HEADROOM - sizeof(struct virtio_net_hdr));

Please use RTE_MBUF_DATA_DMA_ADDR instead of "buf_physaddr + RTE_PKTMBUF_HEADROOM".

> +	start_dp[desc_idx].len = cookie->buf_len -
> +		RTE_PKTMBUF_HEADROOM + sizeof(struct virtio_net_hdr);
> +
> +	vq->vq_free_cnt--;
> +	vq->vq_avail_idx++;
> +
> +	return 0;
> +}
> --
> 1.8.1.4



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