[dpdk-dev] [PATCH v6 13/15] vhost: add Tx support for packed ring

Maxime Coquelin maxime.coquelin at redhat.com
Wed Jul 4 18:09:53 CEST 2018



On 07/04/2018 07:45 AM, Tiwei Bie wrote:
> On Mon, Jul 02, 2018 at 10:16:27AM +0200, Maxime Coquelin wrote:
>> Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
>> ---
>>   lib/librte_vhost/vhost.h      |   1 +
>>   lib/librte_vhost/virtio_net.c | 121 +++++++++++++++++++++++++++++++++++++++++-
>>   2 files changed, 121 insertions(+), 1 deletion(-)
>>
>> diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
>> index a7320469a..6ea8fb896 100644
>> --- a/lib/librte_vhost/vhost.h
>> +++ b/lib/librte_vhost/vhost.h
>> @@ -56,6 +56,7 @@ struct buf_vector {
>>   struct zcopy_mbuf {
>>   	struct rte_mbuf *mbuf;
>>   	uint32_t desc_idx;
>> +	uint16_t desc_count;
>>   	uint16_t in_use;
>>   
>>   	TAILQ_ENTRY(zcopy_mbuf) next;
>> diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
>> index 2e286e228..03dd38235 100644
>> --- a/lib/librte_vhost/virtio_net.c
>> +++ b/lib/librte_vhost/virtio_net.c
>> @@ -1445,6 +1445,122 @@ virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
>>   	return i;
>>   }
>>   
>> +static __rte_always_inline uint16_t
>> +virtio_dev_tx_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
>> +	struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count)
>> +{
>> +	uint16_t i;
>> +
>> +	rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
>> +
>> +	if (unlikely(dev->dequeue_zero_copy)) {
>> +		struct zcopy_mbuf *zmbuf, *next;
>> +		int nr_updated = 0;
>> +
>> +		for (zmbuf = TAILQ_FIRST(&vq->zmbuf_list);
>> +		     zmbuf != NULL; zmbuf = next) {
>> +			next = TAILQ_NEXT(zmbuf, next);
>> +
>> +			if (mbuf_is_consumed(zmbuf->mbuf)) {
>> +				update_shadow_used_ring_packed(vq,
>> +						zmbuf->desc_idx,
>> +						0,
>> +						zmbuf->desc_count);
>> +				nr_updated += 1;
> 
> nr_updated isn't really used.

Right, it seems it should be removed in the _split version too, but I'll 
do that in a separate patch.

Thanks,
Maxime
>> +
>> +				TAILQ_REMOVE(&vq->zmbuf_list, zmbuf, next);
>> +				restore_mbuf(zmbuf->mbuf);
>> +				rte_pktmbuf_free(zmbuf->mbuf);
>> +				put_zmbuf(zmbuf);
>> +				vq->nr_zmbuf -= 1;
>> +			}
>> +		}
>> +
>> +		flush_shadow_used_ring_packed(dev, vq);
>> +		vhost_vring_call(dev, vq);
>> +	}
>> +
> [...]
> 


More information about the dev mailing list