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Mon, 19 Oct 2026 14:31:39 +0000 Message-ID: <7f5447ed-19d4-4e11-813b-d74489a6a723@intel.com> Date: Mon, 19 Oct 2026 17:31:25 +0300 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH iwl-net v3] e1000e: restore jumbo config after DMoff exit To: "Loktionov, Aleksandr" , "Craig I. Hagan" , "Nguyen, Anthony L" , "Kitszel, Przemyslaw" CC: Andrew Lunn , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , "intel-wired-lan@lists.osuosl.org" , "netdev@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" , Fabio Sabai , Matt Vollrath References: <20260928210552.13266-1-hagan@amazon.com> Content-Language: en-US From: "Kadosh, MoriyaX" Organization: Intel Israel (74) Limited In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: TL0P290CA0015.ISRP290.PROD.OUTLOOK.COM (2603:1096:950:5::7) To MN2PR11MB4645.namprd11.prod.outlook.com (2603:10b6:208:269::20) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MN2PR11MB4645:EE_|IA3PR11MB9301:EE_ X-MS-Office365-Filtering-Correlation-Id: b9232fd1-4127-4b6b-89da-08df2dedafaf X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|366016|23010399003|1800799024|261009223027099003|10067099003|56012099006|6133799003|22082099003|18002099003|11063799006|4143699003; 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Hagan >> Sent: Monday, September 28, 2026 11:06 PM >> To: Nguyen, Anthony L ; Kitszel, >> Przemyslaw >> Cc: Andrew Lunn ; David S . Miller >> ; Eric Dumazet ; Jakub >> Kicinski ; Paolo Abeni ; intel- >> wired-lan@lists.osuosl.org; netdev@vger.kernel.org; linux- >> kernel@vger.kernel.org; stable@vger.kernel.org; Fabio Sabai >> ; Matt Vollrath >> Subject: [PATCH iwl-net v3] e1000e: restore jumbo config after DMoff >> exit >> >> On an I219 (pch_spt+) at jumbo MTU, after a link partner reset (e.g. a >> switch reboot) the interface can come back up unable to pass traffic >> until it is manually reset. Observed on I219-LM (8086:15b7) at MTU >> 9000. >> >> When the MAC exits the DMoff state on link-up, the watchdog resets >> only the PHY. A bare PHY reset does not re-run the jumbo-frame >> workaround (e1000_lv_jumbo_workaround_ich8lan), so the jumbo >> configuration is left unapplied and traffic stalls. This was seen with >> NIC runtime PM disabled; if runtime PM were enabled, the device should >> go through a full reset on resume, avoiding this issue. >> >> Request a full reset (FLAG_RESTART_NOW) instead of the bare PHY reset >> when the MAC exits DMoff, so the normal reset path re-applies the >> jumbo-frame configuration. >> >> Fixes: def4ec6dce39 ("e1000e: PCIm function state support") >> Cc: stable@vger.kernel.org >> Reported-by: Fabio Sabai >> Closes: https://github.com/systemd/systemd/issues/25925 >> Suggested-by: Matt Vollrath >> Reviewed-by: Matt Vollrath >> Tested-by: Matt Vollrath >> Assisted-by: LLM >> Signed-off-by: Craig I. Hagan >> --- >> v3: Correct the Fixes: tag to def4ec6dce39 ("e1000e: PCIm function >> state support"), which introduced the DMoff-exit bare PHY reset; >> 2e7256f12cdb only added a pre-condition. This lets stable reach >> the affected trees (v5.3+, including 5.4/5.10). Add Reviewed-by/ >> Tested-by from Matt Vollrath. >> v2: Rework per review: request a full reset on DMoff exit so the >> jumbo-frame workaround is re-applied (root cause identified by >> Matt Vollrath); drop the diagnostic e_info. v1: >> https://lore.kernel.org/netdev/20260923235832.473-1- >> hagan@amazon.com/ >> >> drivers/net/ethernet/intel/e1000e/netdev.c | 8 +++++--- >> 1 file changed, 5 insertions(+), 3 deletions(-) >> >> diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c >> b/drivers/net/ethernet/intel/e1000e/netdev.c >> index 844f31ab3..df7da86a8 100644 >> --- a/drivers/net/ethernet/intel/e1000e/netdev.c >> +++ b/drivers/net/ethernet/intel/e1000e/netdev.c >> @@ -5264,9 +5264,11 @@ static void e1000_watchdog_task(struct >> work_struct *work) >> usleep_range(10000, 20000); >> pcim_state = er32(STATUS); >> >> - /* Checking if MAC exited DMoff >> state */ >> - if (!(pcim_state & >> E1000_STATUS_PCIM_STATE)) >> - e1000_phy_hw_reset(&adapter- >>> hw); >> + /* MAC exited DMoff; do a full >> reset. */ >> + if (!(pcim_state & >> E1000_STATUS_PCIM_STATE)) { >> + adapter->flags |= >> FLAG_RESTART_NOW; >> + goto link_up; >> + } >> } >> } >> >> -- >> 2.47.3 > > Reviewed-by: Aleksandr Loktionov Tested-by: Moriya Kadosh