Re: [dpdk-dev] [PATCH 07/17] net/virtio: implement transmit path for packed queues

[Jens Freimann <jfreimann@redhat.com>]

On Mon, Mar 19, 2018 at 05:04:43PM +0800, Tiwei Bie wrote:
>On Fri, Mar 16, 2018 at 04:21:10PM +0100, Jens Freimann wrote:
>[...]
>> diff --git a/drivers/net/virtio/Makefile b/drivers/net/virtio/Makefile
>> index 6c2c996..aa1e600 100644
>> --- a/drivers/net/virtio/Makefile
>> +++ b/drivers/net/virtio/Makefile
>> @@ -28,6 +28,7 @@ LIBABIVER := 1
>>  SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtqueue.c
>>  SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_pci.c
>>  SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_rxtx.c
>> +SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_rxtx_1.1.c
>
>There is no need to introduce this file just for Tx.

I agree, this is a leftover from the prototype. I'll merge it into
virtio_rxtx.c
>
>>  SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_ethdev.c
>>  SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_rxtx_simple.c
>[...]
>> @@ -603,7 +605,8 @@ struct rte_virtio_xstats_name_off {
>>  	}
>>
>>  	vtpci_reset(hw);
>> -	virtio_dev_free_mbufs(dev);
>> +	if (!vtpci_packed_queue(hw))
>> +		virtio_dev_free_mbufs(dev);
>
>I think we also need to free mbufs for packed ring.

yes, will fix

>
>>  	virtio_free_queues(hw);
>>  }
>[...]
>> +/* Cleanup from completed transmits. */
>> +static void
>> +virtio_xmit_cleanup(struct virtqueue *vq)
>> +{
>> +	uint16_t idx;
>> +	uint16_t size = vq->vq_nentries;
>> +	struct vring_desc_packed *desc = vq->vq_ring.desc_packed;
>> +
>> +	idx = vq->vq_used_cons_idx & (size - 1);
>> +	while (desc_is_used(&desc[idx]) &&
>> +	       vq->vq_free_cnt < size) {
>> +		while (desc[idx].flags & VRING_DESC_F_NEXT) {
>
>We can't use VRING_DESC_F_NEXT when handling used
>descriptors.

Already fixes this but must have been lost in a rebase. Will send it
in v3. 

thanks for the review!

regards,
Jens
>
>Thanks