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Thu, 30 Apr 2026 02:34:20 -0700 (PDT) Received: from [192.168.88.32] ([150.228.93.27]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-447b76e5c0csm11853942f8f.29.2026.04.30.02.34.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 30 Apr 2026 02:34:19 -0700 (PDT) Message-ID: <9d7f1bbc-155d-4c18-bcf7-732ebe4cbf67@redhat.com> Date: Thu, 30 Apr 2026 11:34:17 +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: Qingfang Deng , Michal Ostrowski , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , David Ahern , Simon Horman , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: linux-ppp@vger.kernel.org, Felix Fietkau References: <20260326081127.61229-1-dqfext@gmail.com> Content-Language: en-US From: Paolo Abeni In-Reply-To: <20260326081127.61229-1-dqfext@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 3/26/26 9:11 AM, Qingfang Deng wrote: > +static int pppoe_gro_complete(struct sk_buff *skb, int nhoff) > +{ > + struct pppoe_hdr *phdr = (struct pppoe_hdr *)(skb->data + nhoff); > + __be16 type = pppoe_hdr_proto(phdr); > + struct packet_offload *ptype; > + unsigned int len; > + > + ptype = gro_find_complete_by_type(type); > + if (!ptype) > + return -ENOENT; > + > + len = skb->len - (nhoff + sizeof(*phdr)); > + len = min(len, 0xFFFFU); AFAICS, when the computed len is >= 64K, and the above min() will truncate it, later pppoe_rcv() will drop the packet. I think you should prevent such case at GRO time, flushing the chain when it grows too big. > + phdr->length = cpu_to_be16(len); > + > + return INDIRECT_CALL_INET(ptype->callbacks.gro_complete, > + ipv6_gro_complete, inet_gro_complete, > + skb, nhoff + PPPOE_SES_HLEN); > +} > + > +static struct sk_buff *pppoe_gso_segment(struct sk_buff *skb, > + netdev_features_t features) > +{ > + unsigned int pppoe_hlen = sizeof(struct pppoe_hdr) + 2; > + struct sk_buff *segs = ERR_PTR(-EINVAL); > + u16 mac_offset = skb->mac_header; > + struct packet_offload *ptype; > + u16 mac_len = skb->mac_len; > + struct pppoe_hdr *phdr; > + __be16 orig_type, type; > + int len, nhoff; > + > + skb_reset_network_header(skb); > + nhoff = skb_network_header(skb) - skb_mac_header(skb); > + > + if (unlikely(!pskb_may_pull(skb, pppoe_hlen))) > + goto out; > + > + phdr = (struct pppoe_hdr *)skb_network_header(skb); > + type = pppoe_hdr_proto(phdr); > + ptype = gro_find_complete_by_type(type); > + if (!ptype) > + goto out; > + > + orig_type = skb->protocol; > + __skb_pull(skb, pppoe_hlen); > + segs = ptype->callbacks.gso_segment(skb, features); > + if (IS_ERR_OR_NULL(segs)) { > + skb_gso_error_unwind(skb, orig_type, pppoe_hlen, mac_offset, > + mac_len); > + goto out; > + } > + > + 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? Why not? A comment in the code or in the commit message would be appreciated. /P