[dpdk-dev] [PATCH v3 07/11] net/virtio: support in-order Rx and Tx

[Maxime Coquelin]

On 06/28/2018 11:52 PM, Marvin Liu wrote:
> IN_ORDER Rx function depends on merge-able feature. Descriptors
> allocation and free will be done in bulk.
> 
> Virtio dequeue logic:
>      dequeue_burst_rx(burst mbufs)
>      for (each mbuf b) {
>              if (b need merge) {
>                      merge remained mbufs
>                      add merged mbuf to return mbufs list
>              } else {
>                      add mbuf to return mbufs list
>              }
>      }
>      if (last mbuf c need merge) {
>              dequeue_burst_rx(required mbufs)
>              merge last mbuf c
>      }
>      refill_avail_ring_bulk()
>      update_avail_ring()
>      return mbufs list
> 
> IN_ORDER Tx function can support offloading features. Packets which
> matched "can_push" option will be handled by simple xmit function. Those
> packets can't match "can_push" will be handled by original xmit function
> with in-order flag.
> 
> Virtio enqueue logic:
>      xmit_cleanup(used descs)
>      for (each xmit mbuf b) {
>              if (b can inorder xmit) {
>                      add mbuf b to inorder burst list
>                      continue
>              } else {
>                      xmit inorder burst list
>                      xmit mbuf b by original function
>              }
>      }
>      if (inorder burst list not empty) {
>              xmit inorder burst list
>      }
>      update_avail_ring()
> 
> Signed-off-by: Marvin Liu <yong.liu at intel.com>
> 

Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>

Thanks,
Maxime