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[34.85.165.172]) by smtp.gmail.com with ESMTPSA id 00721157ae682-7b9ee9b1e55sm47723417b3.37.2026.04.20.12.46.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Apr 2026 12:46:02 -0700 (PDT) Date: Mon, 20 Apr 2026 15:46:01 -0400 From: Willem de Bruijn To: Nick Hudson , bpf@vger.kernel.org, netdev@vger.kernel.org, Willem de Bruijn , Martin KaFai Lau Cc: Nick Hudson , Max Tottenham , Anna Glasgall , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , linux-kernel@vger.kernel.org Message-ID: In-Reply-To: <20260420104051.1528843-6-nhudson@akamai.com> References: <20260420104051.1528843-1-nhudson@akamai.com> <20260420104051.1528843-6-nhudson@akamai.com> Subject: Re: [PATCH v5 5/6] bpf: clear decap tunnel GSO state in skb_adjust_room Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Nick Hudson wrote: > On shrink in bpf_skb_adjust_room(), clear tunnel-specific GSO flags > according to the decapsulation flags: > > - BPF_F_ADJ_ROOM_DECAP_L4_UDP clears SKB_GSO_UDP_TUNNEL{,_CSUM} > - BPF_F_ADJ_ROOM_DECAP_L4_GRE clears SKB_GSO_GRE{,_CSUM} > - BPF_F_ADJ_ROOM_DECAP_IPXIP4 clears SKB_GSO_IPXIP4 > - BPF_F_ADJ_ROOM_DECAP_IPXIP6 clears SKB_GSO_IPXIP6 > > When all tunnel-related GSO bits are cleared, also clear > skb->encapsulation. > > Handle the ESP inside a UDP tunnel case where encapsulation should remain > set. > > Co-developed-by: Max Tottenham > Signed-off-by: Max Tottenham > Co-developed-by: Anna Glasgall > Signed-off-by: Anna Glasgall > Signed-off-by: Nick Hudson Reviewed-by: Willem de Bruijn