From: "Hu, Jiayu" <jiayu.hu@intel.com>
To: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>,
"Kavanagh, Mark B" <mark.b.kavanagh@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>, "Tan, Jianfeng" <jianfeng.tan@intel.com>
Subject: Re: [dpdk-dev] [PATCH v3 2/5] gso: add TCP/IPv4 GSO support
Date: Thu, 14 Sep 2017 00:59:58 +0000 [thread overview]
Message-ID: <ED946F0BEFE0A141B63BABBD629A2A9B387CD0EE@SHSMSX151.ccr.corp.intel.com> (raw)
In-Reply-To: <2601191342CEEE43887BDE71AB9772584F24A843@irsmsx105.ger.corp.intel.com>
Hi Konstantin,
> -----Original Message-----
> From: Ananyev, Konstantin
> Sent: Wednesday, September 13, 2017 11:13 PM
> To: Kavanagh, Mark B <mark.b.kavanagh@intel.com>; Hu, Jiayu
> <jiayu.hu@intel.com>
> Cc: dev@dpdk.org; Tan, Jianfeng <jianfeng.tan@intel.com>
> Subject: RE: [PATCH v3 2/5] gso: add TCP/IPv4 GSO support
>
> Hi Mark,
>
> > -----Original Message-----
> > From: Kavanagh, Mark B
> > Sent: Wednesday, September 13, 2017 3:52 PM
> > To: Ananyev, Konstantin <konstantin.ananyev@intel.com>; Hu, Jiayu
> <jiayu.hu@intel.com>
> > Cc: dev@dpdk.org; Tan, Jianfeng <jianfeng.tan@intel.com>
> > Subject: RE: [PATCH v3 2/5] gso: add TCP/IPv4 GSO support
> >
> > >From: Ananyev, Konstantin
> > >Sent: Wednesday, September 13, 2017 10:38 AM
> > >To: Hu, Jiayu <jiayu.hu@intel.com>
> > >Cc: dev@dpdk.org; Kavanagh, Mark B <mark.b.kavanagh@intel.com>;
> Tan, Jianfeng
> > ><jianfeng.tan@intel.com>
> > >Subject: RE: [PATCH v3 2/5] gso: add TCP/IPv4 GSO support
> > >
> > >
> > >
> > >> > > +
> > >> > > +int
> > >> > > +gso_tcp4_segment(struct rte_mbuf *pkt,
> > >> > > + uint16_t gso_size,
> > >> > > + uint8_t ipid_delta,
> > >> > > + struct rte_mempool *direct_pool,
> > >> > > + struct rte_mempool *indirect_pool,
> > >> > > + struct rte_mbuf **pkts_out,
> > >> > > + uint16_t nb_pkts_out)
> > >> > > +{
> > >> > > + struct ipv4_hdr *ipv4_hdr;
> > >> > > + uint16_t tcp_dl;
> > >> > > + uint16_t pyld_unit_size;
> > >> > > + uint16_t hdr_offset;
> > >> > > + int ret = 1;
> > >> > > +
> > >> > > + ipv4_hdr = (struct ipv4_hdr *)(rte_pktmbuf_mtod(pkt, char *)
> +
> > >> > > + pkt->l2_len);
> > >> > > + /* Don't process the fragmented packet */
> > >> > > + if (unlikely((ipv4_hdr->fragment_offset & rte_cpu_to_be_16(
> > >> > > +
> IPV4_HDR_DF_MASK)) == 0)) {
> > >> >
> > >> >
> > >> > It is not a check for fragmented packet - it is a check that
> fragmentation
> > >is allowed for that packet.
> > >> > Should be IPV4_HDR_DF_MASK - 1, I think.
> > >
> > >DF bit doesn't indicate is packet fragmented or not.
> > >It forbids to fragment packet any further.
> > >To check is packet already fragmented or not, you have to check MF bit
> and
> > >frag_offset.
> > >Both have to be zero for un-fragmented packets.
> > >
> > >>
> > >> IMO, IPV4_HDR_DF_MASK whose value is (1 << 14) is used to get DF bit.
> It's a
> > >> little-endian value. But ipv4_hdr->fragment_offset is big-endian order.
> > >> So the value of DF bit should be "ipv4_hdr->fragment_offset &
> > >rte_cpu_to_be_16(
> > >> IPV4_HDR_DF_MASK)". If this value is 0, the input packet is fragmented.
> > >>
> > >> >
> > >> > > + pkts_out[0] = pkt;
> > >> > > + return ret;
> > >> > > + }
> > >> > > +
> > >> > > + tcp_dl = rte_be_to_cpu_16(ipv4_hdr->total_length) - pkt-
> >l3_len -
> > >> > > + pkt->l4_len;
> > >> >
> > >> > Why not use pkt->pkt_len - pkt->l2_len -pkt_l3_len - pkt_l4_len?
> > >>
> > >> Yes, we can use pkt->pkt_len - pkt->l2_len -pkt_l3_len - pkt_l4_len here.
> > >>
> > >> >
> > >> > > + /* Don't process the packet without data */
> > >> > > + if (unlikely(tcp_dl == 0)) {
> > >> > > + pkts_out[0] = pkt;
> > >> > > + return ret;
> > >> > > + }
> > >> > > +
> > >> > > + hdr_offset = pkt->l2_len + pkt->l3_len + pkt->l4_len;
> > >> > > + pyld_unit_size = gso_size - hdr_offset - ETHER_CRC_LEN;
> > >> >
> > >> > Hmm, why do we need to count CRC_LEN here?
> > >>
> > >> Yes, we shouldn't count ETHER_CRC_LEN here. Its length should be
> > >> included in gso_size.
> > >
> > >Why?
> > >What is the point to account crc len into this computation?
> > >Why not just assume that gso_size is already a max_frame_size - crc_len
> > >As I remember, when we RX packet crc bytes will be already stripped,
> > >when user populates the packet, he doesn't care about crc bytes too.
> >
> > Hi Konstantin,
> >
> > When packet is tx'd, the 4B for CRC are added back into the packet; if the
> payload is already at max capacity, then the actual segment size
> > will be 4B larger than expected (e.g. 1522B, as opposed to 1518B).
> > To prevent that from happening, we account for the CRC len in this
> calculation.
>
>
> Ok, and what prevents you to set gso_ctx.gso_size = 1514; /*ether frame
> size without crc bytes */
> ?
Exactly, applications can set 1514 to gso_segsz instead of 1518, if the lower layer
will add CRC to the packet.
Jiayu
> Konstantin
>
> >
> > If I've missed anything, please do let me know!
> >
> > Thanks,
> > Mark
> >
> > >
> > >Konstantin
next prev parent reply other threads:[~2017-09-14 1:00 UTC|newest]
Thread overview: 157+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-24 14:15 [dpdk-dev] [PATCH 0/5] Support TCP/IPv4, VxLAN and GRE GSO in DPDK Jiayu Hu
2017-08-24 14:15 ` [dpdk-dev] [PATCH 1/5] lib: add Generic Segmentation Offload API framework Jiayu Hu
2017-08-30 1:38 ` Ananyev, Konstantin
2017-08-30 7:57 ` Jiayu Hu
2017-08-24 14:15 ` [dpdk-dev] [PATCH 2/5] gso/lib: add TCP/IPv4 GSO support Jiayu Hu
2017-08-30 1:38 ` Ananyev, Konstantin
2017-08-30 2:55 ` Jiayu Hu
2017-08-30 9:25 ` Kavanagh, Mark B
2017-08-30 9:39 ` Ananyev, Konstantin
2017-08-30 9:59 ` Ananyev, Konstantin
2017-08-30 13:27 ` Kavanagh, Mark B
2017-08-30 9:03 ` Jiayu Hu
2017-09-04 3:31 ` Jiayu Hu
2017-09-04 9:54 ` Ananyev, Konstantin
2017-09-05 1:09 ` Hu, Jiayu
2017-09-11 13:04 ` Ananyev, Konstantin
2017-08-24 14:15 ` [dpdk-dev] [PATCH 3/5] lib/gso: add VxLAN " Jiayu Hu
2017-08-24 14:15 ` [dpdk-dev] [PATCH 4/5] lib/gso: add GRE " Jiayu Hu
2017-08-24 14:15 ` [dpdk-dev] [PATCH 5/5] app/testpmd: enable TCP/IPv4, VxLAN and GRE GSO Jiayu Hu
2017-08-30 1:37 ` [dpdk-dev] [PATCH 0/5] Support TCP/IPv4, VxLAN and GRE GSO in DPDK Ananyev, Konstantin
2017-08-30 7:36 ` Jiayu Hu
2017-08-30 10:49 ` Ananyev, Konstantin
2017-08-30 13:32 ` Kavanagh, Mark B
2017-09-05 7:57 ` [dpdk-dev] [PATCH v2 " Jiayu Hu
2017-09-05 7:57 ` [dpdk-dev] [PATCH v2 1/5] gso: add Generic Segmentation Offload API framework Jiayu Hu
2017-09-05 7:57 ` [dpdk-dev] [PATCH v2 2/5] gso: add TCP/IPv4 GSO support Jiayu Hu
2017-09-05 7:57 ` [dpdk-dev] [PATCH v2 3/5] gso: add VxLAN " Jiayu Hu
2017-09-05 7:57 ` [dpdk-dev] [PATCH v2 4/5] gso: add GRE " Jiayu Hu
2017-09-05 7:57 ` [dpdk-dev] [PATCH v2 5/5] app/testpmd: enable TCP/IPv4, VxLAN and GRE GSO Jiayu Hu
2017-09-12 2:43 ` [dpdk-dev] [PATCH v3 0/5] Support TCP/IPv4, VxLAN and GRE GSO in DPDK Jiayu Hu
2017-09-12 2:43 ` [dpdk-dev] [PATCH v3 1/5] gso: add Generic Segmentation Offload API framework Jiayu Hu
2017-09-12 10:36 ` Ananyev, Konstantin
2017-09-13 2:11 ` Jiayu Hu
2017-09-14 18:33 ` Ferruh Yigit
2017-09-15 1:12 ` Hu, Jiayu
2017-09-12 2:43 ` [dpdk-dev] [PATCH v3 2/5] gso: add TCP/IPv4 GSO support Jiayu Hu
2017-09-12 11:17 ` Ananyev, Konstantin
2017-09-13 2:48 ` Jiayu Hu
2017-09-13 9:38 ` Ananyev, Konstantin
2017-09-13 10:23 ` Hu, Jiayu
2017-09-13 14:52 ` Kavanagh, Mark B
2017-09-13 15:13 ` Ananyev, Konstantin
2017-09-14 0:59 ` Hu, Jiayu [this message]
2017-09-14 8:35 ` Kavanagh, Mark B
2017-09-14 8:39 ` Ananyev, Konstantin
2017-09-14 9:00 ` Kavanagh, Mark B
2017-09-14 9:10 ` Ananyev, Konstantin
2017-09-14 9:35 ` Kavanagh, Mark B
2017-09-12 14:17 ` Ananyev, Konstantin
2017-09-13 10:44 ` Jiayu Hu
2017-09-13 22:10 ` Ananyev, Konstantin
2017-09-14 6:07 ` Jiayu Hu
2017-09-14 8:47 ` Ananyev, Konstantin
2017-09-14 9:29 ` Hu, Jiayu
2017-09-14 9:35 ` Ananyev, Konstantin
2017-09-14 10:01 ` Hu, Jiayu
2017-09-14 15:42 ` Kavanagh, Mark B
2017-09-14 18:38 ` Ananyev, Konstantin
2017-09-15 7:54 ` Hu, Jiayu
2017-09-15 8:15 ` Ananyev, Konstantin
2017-09-15 8:17 ` Ananyev, Konstantin
2017-09-15 8:38 ` Hu, Jiayu
2017-09-14 8:51 ` Kavanagh, Mark B
2017-09-14 9:45 ` Hu, Jiayu
2017-09-12 2:43 ` [dpdk-dev] [PATCH v3 3/5] gso: add VxLAN " Jiayu Hu
2017-09-12 2:43 ` [dpdk-dev] [PATCH v3 4/5] gso: add GRE " Jiayu Hu
2017-09-12 2:43 ` [dpdk-dev] [PATCH v3 5/5] app/testpmd: enable TCP/IPv4, VxLAN and GRE GSO Jiayu Hu
2017-09-14 18:33 ` Ferruh Yigit
2017-09-15 1:13 ` Hu, Jiayu
2017-09-19 7:32 ` [dpdk-dev] [PATCH v4 0/5] Support TCP/IPv4, VxLAN and GRE GSO in DPDK Jiayu Hu
2017-09-19 7:32 ` [dpdk-dev] [PATCH v4 1/5] gso: add Generic Segmentation Offload API framework Jiayu Hu
2017-09-19 7:32 ` [dpdk-dev] [PATCH v4 2/5] gso: add TCP/IPv4 GSO support Jiayu Hu
2017-09-20 7:03 ` Yao, Lei A
2017-09-19 7:32 ` [dpdk-dev] [PATCH v4 3/5] gso: add VxLAN " Jiayu Hu
2017-09-20 3:11 ` Tan, Jianfeng
2017-09-20 3:17 ` Hu, Jiayu
2017-09-19 7:32 ` [dpdk-dev] [PATCH v4 4/5] gso: add GRE " Jiayu Hu
2017-09-20 2:53 ` Tan, Jianfeng
2017-09-20 6:01 ` Hu, Jiayu
2017-09-19 7:32 ` [dpdk-dev] [PATCH v4 5/5] app/testpmd: enable TCP/IPv4, VxLAN and GRE GSO Jiayu Hu
2017-09-28 22:13 ` [dpdk-dev] [PATCH v5 0/6] Support TCP/IPv4, VxLAN and GRE GSO in DPDK Mark Kavanagh
2017-10-02 16:45 ` [dpdk-dev] [PATCH v6 0/6] Support TCP/IPv4, VxLAN, " Mark Kavanagh
2017-10-02 16:45 ` [dpdk-dev] [PATCH v6 1/6] gso: add Generic Segmentation Offload API framework Mark Kavanagh
2017-10-04 13:11 ` Ananyev, Konstantin
2017-10-04 13:21 ` Kavanagh, Mark B
2017-10-02 16:45 ` [dpdk-dev] [PATCH v6 2/6] gso: add TCP/IPv4 GSO support Mark Kavanagh
2017-10-04 13:32 ` Ananyev, Konstantin
2017-10-04 14:30 ` Kavanagh, Mark B
2017-10-04 14:49 ` Ananyev, Konstantin
2017-10-04 14:59 ` Kavanagh, Mark B
2017-10-04 13:35 ` Ananyev, Konstantin
2017-10-04 14:22 ` Kavanagh, Mark B
2017-10-02 16:45 ` [dpdk-dev] [PATCH v6 3/6] gso: add VxLAN " Mark Kavanagh
2017-10-04 14:12 ` Ananyev, Konstantin
2017-10-04 14:35 ` Kavanagh, Mark B
2017-10-04 16:13 ` Kavanagh, Mark B
2017-10-04 16:17 ` Ananyev, Konstantin
2017-10-02 16:45 ` [dpdk-dev] [PATCH v6 4/6] gso: add GRE " Mark Kavanagh
2017-10-04 14:15 ` Ananyev, Konstantin
2017-10-04 14:36 ` Kavanagh, Mark B
2017-10-02 16:45 ` [dpdk-dev] [PATCH v6 5/6] app/testpmd: enable TCP/IPv4, VxLAN and GRE GSO Mark Kavanagh
2017-10-04 15:08 ` Ananyev, Konstantin
2017-10-04 16:23 ` Kavanagh, Mark B
2017-10-04 16:26 ` Ananyev, Konstantin
2017-10-04 16:51 ` Kavanagh, Mark B
2017-10-02 16:45 ` [dpdk-dev] [PATCH v6 6/6] doc: add GSO programmer's guide Mark Kavanagh
2017-10-04 13:51 ` Mcnamara, John
2017-10-05 11:02 ` [dpdk-dev] [PATCH v7 0/6] Support TCP/IPv4, VxLAN, and GRE GSO in DPDK Mark Kavanagh
2017-10-05 11:02 ` [dpdk-dev] [PATCH v7 1/6] gso: add Generic Segmentation Offload API framework Mark Kavanagh
2017-10-05 11:02 ` [dpdk-dev] [PATCH v7 2/6] gso: add TCP/IPv4 GSO support Mark Kavanagh
2017-10-05 11:02 ` [dpdk-dev] [PATCH v7 3/6] gso: add VxLAN " Mark Kavanagh
2017-10-05 11:02 ` [dpdk-dev] [PATCH v7 4/6] gso: add GRE " Mark Kavanagh
2017-10-05 11:02 ` [dpdk-dev] [PATCH v7 5/6] app/testpmd: enable TCP/IPv4, VxLAN and GRE GSO Mark Kavanagh
2017-10-05 11:02 ` [dpdk-dev] [PATCH v7 6/6] doc: add GSO programmer's guide Mark Kavanagh
2017-10-05 13:22 ` [dpdk-dev] [PATCH v7 0/6] Support TCP/IPv4, VxLAN, and GRE GSO in DPDK Ananyev, Konstantin
2017-10-05 14:39 ` Kavanagh, Mark B
2017-10-05 15:43 ` [dpdk-dev] [PATCH v8 " Mark Kavanagh
2017-10-05 17:12 ` Ananyev, Konstantin
2017-10-05 20:16 ` Kavanagh, Mark B
2017-10-05 20:36 ` [dpdk-dev] [PATCH v9 " Mark Kavanagh
2017-10-05 22:24 ` Ananyev, Konstantin
2017-10-06 8:24 ` [dpdk-dev] FW: " Kavanagh, Mark B
2017-10-06 10:35 ` [dpdk-dev] " Kavanagh, Mark B
2017-10-06 23:32 ` Ferruh Yigit
2017-10-06 23:34 ` Ferruh Yigit
2017-10-07 14:56 ` [dpdk-dev] [PATCH v10 " Jiayu Hu
2017-10-07 14:56 ` [dpdk-dev] [PATCH v10 1/6] gso: add Generic Segmentation Offload API framework Jiayu Hu
2017-10-07 14:56 ` [dpdk-dev] [PATCH v10 2/6] gso: add TCP/IPv4 GSO support Jiayu Hu
2017-10-07 14:56 ` [dpdk-dev] [PATCH v10 3/6] gso: add VxLAN " Jiayu Hu
2017-10-07 14:56 ` [dpdk-dev] [PATCH v10 4/6] gso: add GRE " Jiayu Hu
2017-10-07 14:56 ` [dpdk-dev] [PATCH v10 5/6] app/testpmd: enable TCP/IPv4, VxLAN and GRE GSO Jiayu Hu
2017-10-07 14:56 ` [dpdk-dev] [PATCH v10 6/6] doc: add GSO programmer's guide Jiayu Hu
2017-10-08 3:40 ` [dpdk-dev] [PATCH v10 0/6] Support TCP/IPv4, VxLAN, and GRE GSO in DPDK Ferruh Yigit
2017-10-05 20:36 ` [dpdk-dev] [PATCH v9 1/6] gso: add Generic Segmentation Offload API framework Mark Kavanagh
2017-10-05 20:36 ` [dpdk-dev] [PATCH v9 2/6] gso: add TCP/IPv4 GSO support Mark Kavanagh
2017-10-05 20:36 ` [dpdk-dev] [PATCH v9 3/6] gso: add VxLAN " Mark Kavanagh
2017-10-05 20:36 ` [dpdk-dev] [PATCH v9 4/6] gso: add GRE " Mark Kavanagh
2017-10-05 20:36 ` [dpdk-dev] [PATCH v9 5/6] app/testpmd: enable TCP/IPv4, VxLAN and GRE GSO Mark Kavanagh
2017-10-05 20:36 ` [dpdk-dev] [PATCH v9 6/6] doc: add GSO programmer's guide Mark Kavanagh
2017-10-06 13:34 ` Mcnamara, John
2017-10-06 13:41 ` Kavanagh, Mark B
2017-10-05 15:43 ` [dpdk-dev] [PATCH v8 1/6] gso: add Generic Segmentation Offload API framework Mark Kavanagh
2017-10-05 15:44 ` [dpdk-dev] [PATCH v8 2/6] gso: add TCP/IPv4 GSO support Mark Kavanagh
2017-10-05 15:44 ` [dpdk-dev] [PATCH v8 3/6] gso: add VxLAN " Mark Kavanagh
2017-10-05 15:44 ` [dpdk-dev] [PATCH v8 4/6] gso: add GRE " Mark Kavanagh
2017-10-05 15:44 ` [dpdk-dev] [PATCH v8 5/6] app/testpmd: enable TCP/IPv4, VxLAN and GRE GSO Mark Kavanagh
2017-10-05 15:44 ` [dpdk-dev] [PATCH v8 6/6] doc: add GSO programmer's guide Mark Kavanagh
2017-10-05 17:57 ` Mcnamara, John
2017-09-28 22:13 ` [dpdk-dev] [PATCH v5 1/6] gso: add Generic Segmentation Offload API framework Mark Kavanagh
2017-09-28 22:13 ` [dpdk-dev] [PATCH v5 2/6] gso: add TCP/IPv4 GSO support Mark Kavanagh
2017-09-29 3:12 ` Jiayu Hu
2017-09-29 9:05 ` Kavanagh, Mark B
2017-09-28 22:13 ` [dpdk-dev] [PATCH v5 3/6] gso: add VxLAN " Mark Kavanagh
2017-09-28 22:13 ` [dpdk-dev] [PATCH v5 4/6] gso: add GRE " Mark Kavanagh
2017-09-28 22:13 ` [dpdk-dev] [PATCH v5 5/6] app/testpmd: enable TCP/IPv4, VxLAN and GRE GSO Mark Kavanagh
2017-09-28 22:13 ` [dpdk-dev] [PATCH v5 6/6] doc: add GSO programmer's guide Mark Kavanagh
2017-09-28 22:18 ` [dpdk-dev] [PATCH v5 2/6] gso: add TCP/IPv4 GSO support Mark Kavanagh
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