From: "Liu, Jijiang" <jijiang.liu@intel.com>
To: Thomas Monjalon <thomas.monjalon@6wind.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>, "Michael S. Tsirkin" <mst@redhat.com>
Subject: Re: [dpdk-dev] [PATCH v3 6/8] driver/virtio:enqueue vhost TX offload
Date: Wed, 4 Nov 2015 13:06:04 +0000 [thread overview]
Message-ID: <1ED644BD7E0A5F4091CF203DAFB8E4CC22BCFE5B@SHSMSX101.ccr.corp.intel.com> (raw)
In-Reply-To: <2611781.I9AKvK5K3K@xps13>
Hi Thomas,
> -----Original Message-----
> From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> Sent: Wednesday, November 4, 2015 7:18 PM
> To: Liu, Jijiang
> Cc: dev@dpdk.org; Michael S. Tsirkin
> Subject: Re: [dpdk-dev] [PATCH v3 6/8] driver/virtio:enqueue vhost TX
> offload
>
> 2015-11-04 18:54, Jijiang Liu:
> > + /* if vhost TX checksum offload is required */
> > + if (m->ol_flags & PKT_TX_IP_CKSUM) {
> > + hdr->csum_start = m->l2_len;
> > + hdr->csum_offset = offsetof(struct ipv4_hdr, hdr_checksum);
> > + } else if (m->ol_flags & PKT_TX_L4_MASK) {
> > + hdr->csum_start = m->l2_len + m->l3_len;
> > + switch (m->ol_flags & PKT_TX_L4_MASK) {
> > + case PKT_TX_TCP_CKSUM:
> > + hdr->csum_offset = offsetof(struct tcp_hdr, cksum);
> > + break;
> > + case PKT_TX_UDP_CKSUM:
> > + hdr->csum_offset = offsetof(struct udp_hdr,
> > + dgram_cksum);
> > + break;
> > + case PKT_TX_SCTP_CKSUM:
> > + hdr->csum_offset = offsetof(struct sctp_hdr, cksum);
> > + break;
> > + default:
> > + break;
> > + }
>
> The header checksum to offload is deduced from csum_offset.
> Your vhost implementation do some parsing to deduce it:
>
The ol_flag is set in application, we have to fill 'csum_start' and 'csum_offset' based on these offload flags.
As long as the 'csum_start' and 'csum_offset' fileds are set correctly, and it can work well with a vanilla linux with vhost.
But in DPDK vhost lib, we need to parse the 'csum_start' and 'csum_offset' filed to get the which offload flags should be set, and the l2_len, l3_len and l3_len also should be filled.
So I think it is necessary to do this in both side.
We can continue discuss this if you have further comments. Thanks
--Jijiang Liu
next prev parent reply other threads:[~2015-11-04 13:07 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-04 10:54 [dpdk-dev] [PATCH v3 0/8] add vhost TX offload support Jijiang Liu
2015-11-04 10:54 ` [dpdk-dev] [PATCH v3 1/8] driver/virtio:add virtual addr for virtio net header Jijiang Liu
2015-11-04 10:54 ` [dpdk-dev] [PATCH v3 2/8] driver/virtio: record virtual address of " Jijiang Liu
2015-11-04 10:54 ` [dpdk-dev] [PATCH v3 3/8] driver/virtio:add vhost TX checksum support capability in virtio-net Jijiang Liu
2015-11-04 10:54 ` [dpdk-dev] [PATCH v3 4/8] driver/virtio:fill virtio device info for TX offload Jijiang Liu
2015-11-04 10:54 ` [dpdk-dev] [PATCH v3 5/8] driver/virtio:enqueue vhost " Jijiang Liu
2015-11-04 10:54 ` [dpdk-dev] [PATCH v3 6/8] " Jijiang Liu
2015-11-04 11:17 ` Thomas Monjalon
2015-11-04 12:52 ` Liu, Jijiang
2015-11-04 13:18 ` Thomas Monjalon
2015-11-05 8:49 ` Xu, Qian Q
2015-11-05 9:02 ` Thomas Monjalon
2015-11-05 10:44 ` Xu, Qian Q
2015-11-06 8:24 ` Xu, Qian Q
2015-11-04 13:06 ` Liu, Jijiang [this message]
2015-11-04 13:08 ` Liu, Jijiang
2015-11-04 13:15 ` Liu, Jijiang
2015-11-04 10:54 ` [dpdk-dev] [PATCH v3 7/8] lib/librte_vhost:dequeue " Jijiang Liu
2015-11-09 4:00 ` Yuanhan Liu
2015-11-09 5:27 ` Liu, Jijiang
2015-11-04 10:54 ` [dpdk-dev] [PATCH v3 8/8] examples/vhost:support TX offload in vhost sample Jijiang Liu
2015-11-09 4:17 ` Yuanhan Liu
2015-11-09 8:17 ` Liu, Jijiang
2015-11-09 8:51 ` Yuanhan Liu
2015-11-09 8:18 ` Liu, Jijiang
2015-11-11 6:47 ` Liu, Jijiang
2015-11-04 11:14 ` [dpdk-dev] [PATCH v3 0/8] add vhost TX offload support Tan, Jianfeng
2015-11-05 14:24 ` Glynn, Michael J
-- strict thread matches above, loose matches on Subject: below --
2015-11-04 8:35 Jijiang Liu
2015-11-04 8:35 ` [dpdk-dev] [PATCH v3 6/8] driver/virtio:enqueue vhost TX offload Jijiang Liu
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