From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: "Liu, Yong" <yong.liu@intel.com>, "Bie, Tiwei" <tiwei.bie@intel.com>
Cc: "Wang, Zhihong" <zhihong.wang@intel.com>, "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH v2 6/8] net/virtio: support IN_ORDER Rx and Tx
Date: Wed, 27 Jun 2018 16:32:44 +0200 [thread overview]
Message-ID: <3cadd00b-8cb3-697d-22d0-571591094ffa@redhat.com> (raw)
In-Reply-To: <86228AFD5BCD8E4EBFD2B90117B5E81E630CBF12@SHSMSX103.ccr.corp.intel.com>
On 06/27/2018 04:27 PM, Liu, Yong wrote:
>
>
>> -----Original Message-----
>> From: Maxime Coquelin [mailto:maxime.coquelin@redhat.com]
>> Sent: Wednesday, June 27, 2018 4:18 PM
>> To: Liu, Yong <yong.liu@intel.com>; Bie, Tiwei <tiwei.bie@intel.com>
>> Cc: Wang, Zhihong <zhihong.wang@intel.com>; dev@dpdk.org
>> Subject: Re: [PATCH v2 6/8] net/virtio: support IN_ORDER Rx and Tx
>>
>>
>>
>> On 06/25/2018 05:17 PM, Marvin Liu wrote:
>>> IN_ORDER Rx function can support merge-able feature. Descriptors
>> My understanding of the code is that IN_ORDER Rx function only supports
>> mergeable feature (and it seems to be confirmed by patch 7).
>>
>> So maybe change the text to:
>> "IN_ORDER Rx function requires merge-able feature."
>
> Thanks for point out this, Rx function choice was depended on merge-able feature. Will change comment in next release.
>
>>
>>> 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 can't be
>> s/can support/supports/
>>
>>> transmitted by IN_ORDER Tx will be handled by normal Tx.
>>
>> Can you clarify why some packets can't be transmitted by IN_ORDER Tx?
>
> My previous description may not clear, all Tx descriptors will be saved to avail ring in-order.
> For making code clean, packets which matched "can_push" option will be handled by simple xmit inorder function.
> Those packets can't match "can_push" will be handled one by one by previous xmit function.
Thanks! Sounds good with above clarification.
Maxime
> Thanks,
> Marvin
>
>>
>>> 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 with normal xmit
>>> }
>>> }
>>> if (inorder burst list not empty) {
>>> xmit inorder burst list
>>> }
>>> update_avail_ring()
>>>
>>> Signed-off-by: Marvin Liu <yong.liu@intel.com>
>>>
>>
>>
>> Other than above clarification needed, the code looks good to me.
>>
>> Thanks,
>> Maxime
next prev parent reply other threads:[~2018-06-27 14:32 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-25 15:17 [dpdk-dev] [PATCH v2 0/8] support VIRTIO_F_IN_ORDER feature Marvin Liu
2018-06-25 15:17 ` [dpdk-dev] [PATCH v2 1/8] vhost: announce VIRTIO_F_IN_ORDER support Marvin Liu
2018-06-26 7:54 ` Maxime Coquelin
2018-06-25 15:17 ` [dpdk-dev] [PATCH v2 2/8] net/virtio: add VIRTIO_F_IN_ORDER definition Marvin Liu
2018-06-26 7:58 ` Maxime Coquelin
2018-06-25 15:17 ` [dpdk-dev] [PATCH v2 3/8] net/virtio-user: add mrg_rxbuf and in_order vdev parameters Marvin Liu
2018-06-27 6:53 ` Maxime Coquelin
2018-06-25 15:17 ` [dpdk-dev] [PATCH v2 4/8] net/virtio: free IN_ORDER descriptors before device start Marvin Liu
2018-06-27 6:58 ` Maxime Coquelin
2018-06-25 15:17 ` [dpdk-dev] [PATCH v2 5/8] net/virtio: extract common part for IN_ORDER functions Marvin Liu
2018-06-27 6:59 ` Maxime Coquelin
2018-06-25 15:17 ` [dpdk-dev] [PATCH v2 6/8] net/virtio: support IN_ORDER Rx and Tx Marvin Liu
2018-06-27 8:18 ` Maxime Coquelin
2018-06-27 14:27 ` Liu, Yong
2018-06-27 14:32 ` Maxime Coquelin [this message]
2018-06-25 15:17 ` [dpdk-dev] [PATCH v2 7/8] net/virtio: add IN_ORDER Rx/Tx into selection Marvin Liu
2018-06-27 8:19 ` Maxime Coquelin
2018-06-28 14:11 ` Liu, Yong
2018-06-25 15:17 ` [dpdk-dev] [PATCH v2 8/8] net/virtio: annouce VIRTIO_F_IN_ORDER support Marvin Liu
2018-06-27 8:20 ` Maxime Coquelin
2018-06-26 7:56 ` [dpdk-dev] [PATCH v2 0/8] support VIRTIO_F_IN_ORDER feature Maxime Coquelin
2018-06-26 8:01 ` Liu, Yong
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