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Thu, 30 Apr 2026 09:22:58 -0700 (PDT) Received: from [192.168.88.32] ([150.228.93.27]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-5103b71c304sm1685121cf.29.2026.04.30.09.22.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 30 Apr 2026 09:22:57 -0700 (PDT) Message-ID: <40a6d40e-4312-4a1b-bf90-9e009b29de68@redhat.com> Date: Thu, 30 Apr 2026 18:22:54 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH net-next v6 1/2] net: pppoe: implement GRO/GSO support To: Pablo Neira Ayuso , Qingfang Deng Cc: Felix Fietkau , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , David Ahern , Simon Horman , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-ppp@vger.kernel.org References: <20260326081127.61229-1-dqfext@gmail.com> <9d7f1bbc-155d-4c18-bcf7-732ebe4cbf67@redhat.com> Content-Language: en-US From: Paolo Abeni In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 4/30/26 5:57 PM, Pablo Neira Ayuso wrote: > On Thu, Apr 30, 2026 at 11:47:57PM +0800, Qingfang Deng wrote: >> On Thu, Apr 30, 2026 at 5:34 PM Paolo Abeni wrote: >>> >>> AFAICS, when the computed len is >= 64K, and the above min() will >>> truncate it, later pppoe_rcv() will drop the packet. >> >> pppoe_rcv() does _not_ drop such packets. >> The drop condition is "skb->len < ntohs(ph->length)", not the other way around. >> >>>> + skb = segs; >>>> + do { >>>> + phdr = (struct pppoe_hdr *)(skb_mac_header(skb) + nhoff); >>>> + len = skb->len - (nhoff + sizeof(*phdr)); >>>> + phdr->length = cpu_to_be16(len); >>>> + skb->network_header = (u8 *)phdr - skb->head; >>> >>> I understand is quite late for the following question, but... >>> The network headers points to the pppoe hdr. Should it point to the >>> actual IP hdr? > > This is the same with double-tagged-vlan, the network header also > points to the inner vlan in the skb payload. Changing this would > require to revisit all users in the tree that are already assuming > this. Ah right, the relevant GRO stage is running on top of an ethernet device and the RX path there resets the NH just after the ethernet one. I got lost in the relevant hooking. This patch (and v7) LGTM, thanks. Paolo