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b=K/MxXuElcNxoRExrTA1OCA974ne0Oychp+P7MVYeVhTXA2ZS8/YCAPtoYZ1he/xdQ093Y+BITwfJbtBfIOLeYIievVeNFt8IL9voa5tfxhpHwqK5TL48CurywZz8i6dds7JbsSj9pLhkP3dKMryALJLvnV9DWTUFe3kbfk0AFNTRBJvT+XkadGdll777f+zK2pacfgv+mUMwufSdrdyfPfb3Ueq8fLIEBTYeafaDsauDhrGdZ64cTXIQdtn9AWch3Hmc7HHRTqHsKl83dWlQ3MfMJkH9yKi0cHyc/hGqCLFVDQkrAEdl8Dh2OxgI4tMmHsh749iNVDnd4+5TVyWmMQ== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=digi.com; Received: from CO1PR10MB4561.namprd10.prod.outlook.com (2603:10b6:303:9d::15) by IA0PR10MB6698.namprd10.prod.outlook.com (2603:10b6:208:442::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8251.15; Wed, 11 Dec 2024 14:43:00 +0000 Received: from CO1PR10MB4561.namprd10.prod.outlook.com ([fe80::ecc0:e020:de02:c448]) by CO1PR10MB4561.namprd10.prod.outlook.com ([fe80::ecc0:e020:de02:c448%4]) with mapi id 15.20.8251.008; Wed, 11 Dec 2024 14:43:00 +0000 Message-ID: <31d2a9eb-958f-43b6-84ef-d687e52cea08@digi.com> Date: Wed, 11 Dec 2024 15:42:54 +0100 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] net: dsa: tag_ocelot_8021q: fix broken reception To: Vladimir Oltean Cc: netdev@vger.kernel.org, claudiu.manoil@nxp.com, alexandre.belloni@bootlin.com, UNGLinuxDriver@microchip.com, andrew@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org References: <20241211124657.1357330-1-robert.hodaszi@digi.com> <20241211143734.d3motemj7kwao4td@skbuf> Content-Language: en-US From: Robert Hodaszi In-Reply-To: <20241211143734.d3motemj7kwao4td@skbuf> Content-Type: text/plain; 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This email originated outside of the organization! Do not click links or open attachments unless you recognize the sender and know the content is safe. > > > > On Wed, Dec 11, 2024 at 01:46:56PM +0100, Robert Hodaszi wrote: >> Commit dcfe7673787b4bfea2c213df443d312aa754757b ("net: dsa: tag_sja1105: >> absorb logic for not overwriting precise info into dsa_8021q_rcv()") >> added support to let the DSA switch driver set source_port and >> switch_id. tag_8021q's logic overrides the previously set source_port >> and switch_id only if they are marked as "invalid" (-1). sja1105 and >> vsc73xx drivers are doing that properly, but ocelot_8021q driver doesn't >> initialize those variables. That causes dsa_8021q_rcv() doesn't set >> them, and they remain unassigned. >> >> Initialize them as invalid to so dsa_8021q_rcv() can return with the >> proper values. >> >> Signed-off-by: Robert Hodaszi >> Cc: stable@vger.kernel.org >> --- > Thank you for the patch, and sorry for the breakage. I suggest the > following alternative commit message: > > The blamed commit changed the dsa_8021q_rcv() calling convention to > accept pre-populated source_port and switch_id arguments. If those are > not available, as in the case of tag_ocelot_8021q, the arguments must > be preinitialized with -1. > > Due to the bug of passing uninitialized arguments, dsa_8021q_rcv() > does not detect that it needs to populate the source_port and > switch_id, and this makes dsa_conduit_find_user() fail, and leads to > packet loss on reception. > > Fixes: dcfe7673787b ("net: dsa: tag_sja1105: absorb logic for not overwriting precise info into dsa_8021q_rcv()") > Signed-off-by: Robert Hodaszi > Cc: stable@vger.kernel.org Yes, that commit message makes much more sense than mine. Unfortunately, I already sent out the new patch. I rewrite it, and send out a v2 then. Robert