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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM4PR11MB5534.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 5ed0402e-e26b-4527-b580-08d991e5b87b X-MS-Exchange-CrossTenant-originalarrivaltime: 18 Oct 2021 03:16:47.7164 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: ccuxb/S6writa+DlmvSnBZknQpTO5qhTaF6DZLvp4KlmkeytU4eExOLoLRlg8iV9JnjyCFbaWNngYreY3k4G8A== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR11MB1899 X-OriginatorOrg: intel.com Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH] app/testpmd: fix l4 sw csum over multi segments X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: stable-bounces@dpdk.org Sender: "stable" Hi > -----Original Message----- > From: Stephen Hemminger > Sent: Monday, October 18, 2021 11:00 > To: Li, Xiaoyun > Cc: Yigit, Ferruh ; dev@dpdk.org; stable@dpdk.org > Subject: Re: [dpdk-dev] [PATCH] app/testpmd: fix l4 sw csum over multi > segments >=20 > On Fri, 15 Oct 2021 13:13:06 +0800 > Xiaoyun Li wrote: >=20 > > + /* When sw csum is needed, multi-segs needs a buf to contain > > + * the whole packet for later UDP/TCP csum calculation. > > + */ > > + if (m->nb_segs > 1 && !(tx_ol_flags & PKT_TX_TCP_SEG) && > > + !(tx_offloads & UDP_TCP_CSUM)) { > > + l3_buf =3D rte_zmalloc("csum l3_buf", > > + info.pkt_len - info.l2_len, > > + RTE_CACHE_LINE_SIZE); > > + rte_pktmbuf_read(m, info.l2_len, > > + info.pkt_len - info.l2_len, l3_buf); > > + l3_hdr =3D l3_buf; > > + } else > > + l3_hdr =3D (char *)eth_hdr + info.l2_len; > > >=20 > Rather than copying whole packet, make the code handle checksum streaming= . Copying is the easiest way to do this. The problem of handling checksum streaming is that in the first segment, l2= and l3 hdr len is 14 bytes when checksum takes 4 bytes each time. If the datalen of the first segment is 4 bytes aligned (usual case), for th= e second segment and the following segments, they may need to add a special= 2 bytes 0x0 at the start. Also, mbuf is not passed down to process_inner/outer_chksum so the change w= ill be a lot.