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([2a01:e0a:b41:c160:6a1d:efff:fe52:1959]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4887e735532sm57095615e9.0.2026.03.31.09.01.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 31 Mar 2026 09:01:29 -0700 (PDT) Message-ID: Date: Tue, 31 Mar 2026 18:01:28 +0200 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Reply-To: nicolas.dichtel@6wind.com Subject: Re: [PATCH net 1/2] seg6: separate dst_cache for input and output paths in seg6 lwtunnel To: Andrea Mayer , netdev@vger.kernel.org Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, dsahern@kernel.org, david.lebrun@uclouvain.be, stefano.salsano@uniroma2.it, paolo.lungaroni@uniroma2.it, linux-kernel@vger.kernel.org, stable@vger.kernel.org References: <20260331110755.25042-1-andrea.mayer@uniroma2.it> <20260331110755.25042-2-andrea.mayer@uniroma2.it> From: Nicolas Dichtel Content-Language: en-US Organization: 6WIND In-Reply-To: <20260331110755.25042-2-andrea.mayer@uniroma2.it> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Le 31/03/2026 à 13:07, Andrea Mayer a écrit : > The seg6 lwtunnel uses a single dst_cache per encap route, shared > between seg6_input_core() and seg6_output_core(). These two paths > can perform the post-encap SID lookup in different routing contexts > (e.g., ip rules matching on the ingress interface, or VRF table > separation). Whichever path runs first populates the cache, and the > other reuses it blindly, bypassing its own lookup. > > Fix this by splitting the cache into cache_input and cache_output, > so each path maintains its own cached dst independently. > > Fixes: 6c8702c60b88 ("ipv6: sr: add support for SRH encapsulation and injection with lwtunnels") > Cc: stable@vger.kernel.org > Signed-off-by: Andrea Mayer Reviewed-by: Nicolas Dichtel Thanks, Nicolas