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Thread-Topic: [External] : Re: [PATCH] net/tap: Modified TAP BPF program as per the new Kernel-version upgrade requirements. 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: 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 X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: SJ0PR10MB4798.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: b09af74c-9496-4b62-e83e-08dc0ea1974e X-MS-Exchange-CrossTenant-originalarrivaltime: 06 Jan 2024 10:23:57.0662 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: GA4hwgTz9Gsumpt1t2HEwv+mAlD7WIyNY25kGFneC+P7vBt9BRIN6fYfAryZxk/Jbsg+92bV7JdAZ6uE5CFOVFO2Bdlm8wtLYqiC5i72ICo= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR10MB5989 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-01-05_08,2024-01-05_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 spamscore=0 mlxlogscore=999 suspectscore=0 mlxscore=0 adultscore=0 phishscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2401060073 X-Proofpoint-ORIG-GUID: rCQAlaLTa_4E1tYnQn9nCjtD0DpA_vsi X-Proofpoint-GUID: rCQAlaLTa_4E1tYnQn9nCjtD0DpA_vsi X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions <dev.dpdk.org> List-Unsubscribe: <https://mails.dpdk.org/options/dev>, <mailto:dev-request@dpdk.org?subject=unsubscribe> List-Archive: <http://mails.dpdk.org/archives/dev/> List-Post: <mailto:dev@dpdk.org> List-Help: <mailto:dev-request@dpdk.org?subject=help> List-Subscribe: <https://mails.dpdk.org/listinfo/dev>, <mailto:dev-request@dpdk.org?subject=subscribe> Errors-To: dev-bounces@dpdk.org Hi Stephen, The new Kernel expects the BPF maps in BTF format: https://www.kernel.org/d= oc/html/v5.4/bpf/btf.html. So, we need to compile with "-g" option as follows: =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D clang -O2 -target bpf -c tap_bpf_program.c -g -o tap_bpf_program.o =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D I had cross check this functionality with DPDK-22.11 and as the BPF C-progr= am is same had modified just the C-program and submitted for review. I will update the Makefile changes also and will publish for code-review on= ce again w.r.t DPDK-23.11. Thanks, Madhuker. -----Original Message----- From: Madhuker Mythri=20 Sent: 06 January 2024 11:06 To: Stephen Hemminger <stephen@networkplumber.org> Cc: ferruh.yigit@amd.com; dev@dpdk.org Subject: RE: [External] : Re: [PATCH] net/tap: Modified TAP BPF program as = per the new Kernel-version upgrade requirements. The flow creation worked well for us on the Azure/Hyper-V platform using fa= ilsafe/tap PMD, using Kernel-5.15.0 and 5.4 versions. So, does the original/existing code works well on Kernel-6.5 version ? Thanks, Madhuker. -----Original Message----- From: Stephen Hemminger <stephen@networkplumber.org> Sent: 06 January 2024 01:01 To: Madhuker Mythri <madhuker.mythri@oracle.com> Cc: ferruh.yigit@amd.com; dev@dpdk.org Subject: [External] : Re: [PATCH] net/tap: Modified TAP BPF program as per = the new Kernel-version upgrade requirements. On Thu, 4 Jan 2024 22:57:56 +0530 madhuker.mythri@oracle.com wrote: > adhuker Mythri <madhuker.mythri@oracle.com> >=20 > When multiple queues configured, internally RSS will be enabled and thus = TAP BPF RSS byte-code will be loaded on to the Kernel using BPF system call= s. >=20 > Here, the problem is loading the existing BPF byte-code to the Kernel-5.1= 5 and above versions throws errors, i.e: Kernel BPF verifier not accepted t= his existing BPF byte-code and system calls return error code "-7" as follo= ws: > ------------------------ > rss_add_actions(): Failed to load BPF section l3_l4 (7): Argument list=20 > too long > ------------------------ >=20 > RCA: These errors started coming after from the Kernel-5.15 version, in = which lots of new BPF verification restrictions were added for safe executi= on of byte-code on to the Kernel, due to which existing BPF program verific= ation does not pass. > Here are the major BPF verifier restrictions observed: > 1) Need to use new BPF maps structure. > 2) Kernel SKB data pointer access not allowed. > 3) Undefined loops were not allowed(which are bounded by a variable value= ). > 4) unreachable instructions(like: undefined array access). >=20 > After addressing all these Kernel BPF verifier restrictions able to load = the BPF byte-code onto the Kernel successfully. >=20 > Note: This new BPF changes supports from Kernel:4.10 version. >=20 > Bugzilla Id: 1329 >=20 > Signed-off-by: Madhuker Mythri <madhuker.mythri@oracle.com> I tried this version on Debian testing which has: kernel 6.5.0-5-amd64 clang 16.0.6 If build and run with the pre-compiled BPF then it will load the example fl= ow (see https://urldefense.com/v3/__https://doc.dpdk.org/guides/nics/tap.h= tml__;!!ACWV5N9M2RV99hQ!I6LFEsrAnlW2WMQlCy7Sxw-9MxJ_Qtchg-aZdal53Np6QtmC1wW= sMdG_uT3zc57Yu7kvJANA-dQIirEUr-BWfaVXhGtd$ ) But if I recompile the bpf program by using make in the tap/bpf directory, = then the resulting bpf instructions will not make it past verifier. With modified tap_bpf_api can get the log message as: testpmd> flow create 0 priority 4 ingress pattern eth dst is=20 testpmd> 0a:0b:0c:0d:0e:0f / ipv4 / tcp / end actions rss queues 0 1 2 testpmd> 3 end / end rss_add_actions(): Failed to load BPF section l3_l4 (13): func#0 @0 0: R1=3Dctx(off=3D0,imm=3D0) R10=3Dfp0 0: (bf) r6 =3D r1 ; R1=3Dctx(off=3D0,imm=3D0) R6_w=3D= ctx(off=3D0,imm=3D0) 1: (18) r1 =3D 0x300 ; R1_w=3D768 3: (63) *(u32 *)(r10 -84) =3D r1 ; R1_w=3D768 R10=3Dfp0 fp-88=3Dmmmm= ???? 4: (bf) r2 =3D r10 ; R2_w=3Dfp0 R10=3Dfp0 5: (07) r2 +=3D -84 ; R2_w=3Dfp-84 6: (18) r1 =3D 0xfd ; R1_w=3D253 8: (85) call bpf_map_lookup_elem#1 R1 type=3Dscalar expected=3Dmap_ptr processed 7 insns (limit 1000000) max_states_per_insn 0 total_states 0 peak= _states 0 mark_read 0 port_flow_complain(): Caught PMD error type 16 (specific action): cause: 0x= 7ffcef37e678, action not supported: Operation not supported