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Tue, 24 Feb 2026 04:18:06 -0800 (PST) Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Tue, 24 Feb 2026 09:18:04 -0300 Message-Id: Subject: Re: [PATCH stable 6.12 0/5] Backport selftest for "bpf: Check skb->transport_header is set in bpf_skb_check_mtu" Cc: =?utf-8?b?UmljYXJkbyBCLiBNYXJsacOocmU=?= To: "Harshit Mogalapalli" , "Shung-Hsi Yu" , From: =?utf-8?b?UmljYXJkbyBCLiBNYXJsacOocmU=?= X-Mailer: aerc 0.21.0-120-ge2f19458bd3f References: <20260224073810.85945-1-shung-hsi.yu@suse.com> In-Reply-To: On Tue Feb 24, 2026 at 4:53 AM -03, Harshit Mogalapalli wrote: > Hi, > > On 24/02/26 13:08, Shung-Hsi Yu wrote: >> This patchset backport the corresponding BPF selftests for commit >> d946f3c98328 ("bpf: Check skb->transport_header is set in >> bpf_skb_check_mtu"), which has already been included since 6.12.63. >>=20 >> The BPF selftest added in commit 6cc73f35406c ("selftests/bpf: Test >> bpf_skb_check_mtu(BPF_MTU_CHK_SEGS) when transport_header is not set") >> additionally depends on network namespace support for BPF selftests >> added by Bastien, otherwise the MTU in root networking namespace will be >> set to 10, causing other BPF selftests to fail. Credit goes to Ricardo >> Marli=C3=A8re for figuring out the dependency. >>=20 > > Note: > I have recently learnt that ideally we are supposed to run upstream=20 > latest kselftests on stable kernels as well. If a feature is not=20 > supported the kselftests are meant to be skipped. That is not true for BPF, from my (limited) experience. > > https://lore.kernel.org/all/a45eaddb-9e17-4e82-8a78-a1d1f6e3d735@linuxfou= ndation.org/ > > Thanks, > Harshit >> Bastien Curutchet (eBPF Foundation) (4): >> selftests/bpf: ns_current_pid_tgid: Rename the test function >> selftests/bpf: Optionally open a dedicated namespace to run test in i= t >> selftests/bpf: tc_links/tc_opts: Unserialize tests >> selftests/bpf: ns_current_pid_tgid: Use test_progs's ns_ feature >>=20 >> Martin KaFai Lau (1): >> selftests/bpf: Test bpf_skb_check_mtu(BPF_MTU_CHK_SEGS) when >> transport_header is not set >>=20 >> .../selftests/bpf/prog_tests/check_mtu.c | 23 ++++++++- >> .../bpf/prog_tests/ns_current_pid_tgid.c | 49 +++++++------------ >> .../selftests/bpf/prog_tests/tc_links.c | 28 +++++------ >> .../selftests/bpf/prog_tests/tc_opts.c | 40 +++++++-------- >> .../selftests/bpf/progs/test_check_mtu.c | 12 +++++ >> tools/testing/selftests/bpf/test_progs.c | 12 +++++ >> 6 files changed, 98 insertions(+), 66 deletions(-) >>=20