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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: e705d33f-e6d5-4cb1-c0a3-08d992a353a8 X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Oct 2021 01:54:02.9991 (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: n0TLMpmdt4p6Ny3GBY46RU045aNuZhp4D9ruiSW5/IQvuWHWUm6Rs2RdqmSZvjCyid559KwA2Sq/TKqfphon0g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR11MB1898 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" > -----Original Message----- > From: Ananyev, Konstantin > Sent: Monday, October 18, 2021 18:16 > To: Li, Xiaoyun ; Stephen Hemminger > > Cc: Yigit, Ferruh ; dev@dpdk.org; stable@dpdk.org > Subject: RE: [dpdk-dev] [PATCH] app/testpmd: fix l4 sw csum over multi > segments >=20 >=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; > > > > > > > > > > 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 the second segment and the following segments, they may need to add= a > special 2 bytes 0x0 at the start. >=20 > Didn't understand that one... > Why you suddenly need to pad non-first segments with zeroes? > Why simply rte_raw_cksum() can't be used for multi-seg case? Normal udp/tcp packets: The first segment: eth hdr + ip hdr + udp/tcp packet (The total length of t= his is mbuf data len so like 2048, 4 bytes aligned) The second segment: continue udp/tcp packet Now, udp/tcp checksum is calculated. It will take the whole udp/tcp packet.= 4 bytes + 4 bytes + 4 bytes... Then 1st segment: udp/tcp packet (size =3D 2048 - 14 =3D 2034, not 4 bytes align= ed, 2 bytes left, if use rte_raw_cksum(), the last 2 bytes will be combined= with 2 bytes zeros) 2nd segment: continue udp/tcp packet (size =3D data_len) For 2nd segment, if don't add 2 bytes zeros first, the checksum value will = be wrong. Because it should be for example 0x1234 (0x12 is left in 1st, 0x34 is in 2n= d), 0x1200+0x0034 is correct but 0x1200+0x3400 is not correct. That's why I think all of the following segments needs zero padding first. And above is only the usual case of normal tcp/udp packets. The issue also = exists for tunnel packets which will calculate outer udp and inner udp/tcp = checksum. >=20 > > Also, mbuf is not passed down to process_inner/outer_chksum so the chan= ge > will be a lot. >=20 > I also think that copying whole packet just to calculate a checksum - way= too > much overhead. Yes. I agree. But it only happens when users don't enable checksum offload,= don't enable TSO and the packet crosses multi-segments.