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Mon, 14 Apr 2025 08:18:27 -0400 (EDT) Date: Mon, 14 Apr 2025 14:18:25 +0200 From: Marek =?utf-8?Q?Marczykowski-G=C3=B3recki?= To: Vitaly Lifshits , Jesse Brandeburg , Tony Nguyen , netdev@vger.kernel.org, intel-wired-lan@lists.osuosl.org Cc: regressions@lists.linux.dev, stable@vger.kernel.org, Sasha Levin Subject: [REGRESSION] e1000e heavy packet loss on Meteor Lake - 6.14.2 Message-ID: Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="5JPjsqyE+gD2u5U8" Content-Disposition: inline --5JPjsqyE+gD2u5U8 Content-Type: text/plain; protected-headers=v1; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Date: Mon, 14 Apr 2025 14:18:25 +0200 From: Marek =?utf-8?Q?Marczykowski-G=C3=B3recki?= To: Vitaly Lifshits , Jesse Brandeburg , Tony Nguyen , netdev@vger.kernel.org, intel-wired-lan@lists.osuosl.org Cc: regressions@lists.linux.dev, stable@vger.kernel.org, Sasha Levin Subject: [REGRESSION] e1000e heavy packet loss on Meteor Lake - 6.14.2 Hi, After updating to 6.14.2, the ethernet adapter is almost unusable, I get over 30% packet loss. Bisect says it's this commit: commit 85f6414167da39e0da30bf370f1ecda5a58c6f7b Author: Vitaly Lifshits Date: Thu Mar 13 16:05:56 2025 +0200 e1000e: change k1 configuration on MTP and later platforms =20 [ Upstream commit efaaf344bc2917cbfa5997633bc18a05d3aed27f ] =20 Starting from Meteor Lake, the Kumeran interface between the integr= ated MAC and the I219 PHY works at a different frequency. This causes sp= oradic MDI errors when accessing the PHY, and in rare circumstances could = lead to packet corruption. =20 To overcome this, introduce minor changes to the Kumeran idle state (K1) parameters during device initialization. Hardware reset reverts this configuration, therefore it needs to be applied in a f= ew places. =20 Fixes: cc23f4f0b6b9 ("e1000e: Add support for Meteor Lake") Signed-off-by: Vitaly Lifshits Tested-by: Avigail Dahan Signed-off-by: Tony Nguyen Signed-off-by: Sasha Levin drivers/net/ethernet/intel/e1000e/defines.h | 3 ++ drivers/net/ethernet/intel/e1000e/ich8lan.c | 80 +++++++++++++++++++++= ++++++-- drivers/net/ethernet/intel/e1000e/ich8lan.h | 4 ++ 3 files changed, 82 insertions(+), 5 deletions(-) My system is Novacustom V540TU laptop with Intel Core Ultra 5 125H. And the e1000e driver is running in a Xen HVM (with PCI passthrough). Interestingly, I have also another one with Intel Core Ultra 7 155H where the issue does not happen. I don't see what is different about network adapter there, they look identical on lspci (but there are differences about other devices)... I see the commit above was already backported to other stable branches too... #regzbot introduced: 85f6414167da39e0da30bf370f1ecda5a58c6f7b --=20 Best Regards, Marek Marczykowski-G=C3=B3recki Invisible Things Lab --5JPjsqyE+gD2u5U8 Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEhrpukzGPukRmQqkK24/THMrX1ywFAmf8/REACgkQ24/THMrX 1yypfAf+N7oPT/p3gMa3SFQmHBMe2BJBSC+RhLh+KBD8CpszZRO4TGw6f5u6ss0f wRDbgw5f2w2SGumk/BABv0ghWH//T+PwC2IoEjjjUtUYzXM6BENGTPqk+XArMnlB S5MPYyFcIaraR12oVMm+gUpHnO0OH/eNN6eXh1CUr8sxZ+wvRkDOZQccEfSBiAE5 yC3GGmAyAK+XcQDdVZsQe1h7d6nOuZGNLVe3yLdUcESZlUetRH6HLVuE+yM3O+IA A/kW5vVHO07FhNwdNsgh9n/XdUmt2t1B7yvg7GRT+EHXP+mTco/UeYYq/HkGodEt uIX8rA3eaDdORKHQU8tqIf2Lekbcyg== =3xGN -----END PGP SIGNATURE----- --5JPjsqyE+gD2u5U8--