[{"id":3676645,"web_url":"http://patchwork.ozlabs.org/comment/3676645/","msgid":"<20260413105228.GM469338@kernel.org>","list_archive_url":null,"date":"2026-04-13T10:52:28","subject":"Re: [Intel-wired-lan] [PATCH iwl-net v2 1/6] ixgbe: fix SWFW\n semaphore timeout for X550 family","submitter":{"id":82748,"url":"http://patchwork.ozlabs.org/api/people/82748/","name":"Simon Horman","email":"horms@kernel.org"},"content":"On Wed, Apr 08, 2026 at 03:11:49PM +0200, Aleksandr Loktionov wrote:\n> According to FW documentation, the most time-consuming FW operation is\n> Shadow RAM (SR) dump which takes up to 3.2 seconds. For X550 family\n> devices the module-update FW command can take over 4.5 s. The default\n> semaphore loop runs 200 iterations with a 5 ms sleep each, giving a\n> maximum wait of 1 s -- not \"200 ms\" as previously stated in error.\n> This is insufficient for X550 family FW update operations and causes\n> spurious EBUSY failures.\n> \n> Extend the SW/FW semaphore timeout from 1 s to 5 s (1000 iterations x\n> 5 ms) for all three X550 variants: ixgbe_mac_X550, ixgbe_mac_X550EM_x,\n> and ixgbe_mac_x550em_a. All three share the same FW and exhibit the\n> same worst-case latency. Use three explicit mac.type comparisons rather\n> than a range check so future MAC additions are not inadvertently\n> captured.\n> \n> The timeout variable is set immediately before the loop so the intent\n> is clear, with an inline comment stating the resulting maximum delay.\n> \n> Suggested-by: Soumen Karmakar \n> Cc: stable@vger.kernel.org\n> Suggested-by: Marta Plantykow \n> Signed-off-by: Aleksandr Loktionov \n> ---\n> v1 -> v2:\n> - Squash with 0015 (X550EM extension); fix commit message (\"200ms\" was\n> wrong, actual default is 1 s); replace >= / <= range check with three\n> explicit mac.type == comparisons per Tony Nguyen.\n\nReviewed-by: Simon Horman ","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=osuosl.org header.i=@osuosl.org header.a=rsa-sha256\n header.s=default header.b=fL/7mW2S;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=osuosl.org\n (client-ip=2605:bc80:3010::136; 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receiver=","DMARC-Filter":"OpenDMARC Filter v1.4.2 smtp4.osuosl.org C819242112","Date":"Mon, 13 Apr 2026 11:52:28 +0100","From":"Simon Horman ","To":"Aleksandr Loktionov ","Cc":"intel-wired-lan@lists.osuosl.org, anthony.l.nguyen@intel.com,\n netdev@vger.kernel.org","Message-ID":"<20260413105228.GM469338@kernel.org>","References":"<20260408131154.2661818-1-aleksandr.loktionov@intel.com>\n <20260408131154.2661818-2-aleksandr.loktionov@intel.com>","MIME-Version":"1.0","Content-Type":"text/plain; charset=us-ascii","Content-Disposition":"inline","In-Reply-To":"<20260408131154.2661818-2-aleksandr.loktionov@intel.com>","X-Mailman-Original-DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple;\n d=kernel.org; s=k20201202; t=1776077551;\n bh=/59Z2nIxca4BWCGm41Q6Vv1qVELMXteJ1TzzUL0CZBs=;\n h=Date:From:To:Cc:Subject:References:In-Reply-To:From;\n b=Aa9qG/FtFR8PilwlAVTGc2cfRcP/xOxcrUt8dNlp7948fgaf/zaAqfG5vsj5x6EVf\n keI7k+eYVk6wSRpo/Bj7K4sqjh36TCDmdfoFg2nKtOChlfUzXxt9LEH7AneAM6FKsJ\n uV6ywKoThT00sSA6HZ8G65p9xRm++NQQI1aGCzP5N+gF8UwnUYsiJ1BHeWgXXV6RLO\n S0TosDCcHNT/0T/xf/D7x8Cm7aFKHW53Ucde4CW7pQnzeOqa8JicFVZxOq2eG8dB0z\n y992Opoqf8AYFdS177QYXhKHmseDoUXE0eAsA9IOAbway64CDdOczMjrP2OL2mu+ag\n lZAG68Czz7Irg==","X-Mailman-Original-Authentication-Results":["smtp4.osuosl.org;\n dmarc=pass (p=quarantine dis=none)\n header.from=kernel.org","smtp4.osuosl.org;\n dkim=pass (2048-bit key,\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=Aa9qG/Ft"],"Subject":"Re: [Intel-wired-lan] [PATCH iwl-net v2 1/6] ixgbe: fix SWFW\n semaphore timeout for X550 family","X-BeenThere":"intel-wired-lan@osuosl.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Intel Wired Ethernet Linux Kernel Driver Development\n ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"intel-wired-lan-bounces@osuosl.org","Sender":"\"Intel-wired-lan\" "}},{"id":3676995,"web_url":"http://patchwork.ozlabs.org/comment/3676995/","msgid":"<704b3b28-cd38-4672-975a-52a36250e793@intel.com>","list_archive_url":null,"date":"2026-04-14T00:56:45","subject":"Re: [Intel-wired-lan] [PATCH iwl-net v2 1/6] ixgbe: fix SWFW\n semaphore timeout for X550 family","submitter":{"id":9784,"url":"http://patchwork.ozlabs.org/api/people/9784/","name":"Jacob Keller","email":"jacob.e.keller@intel.com"},"content":"On 4/8/2026 6:11 AM, Aleksandr Loktionov wrote:\n> According to FW documentation, the most time-consuming FW operation is\n> Shadow RAM (SR) dump which takes up to 3.2 seconds. For X550 family\n> devices the module-update FW command can take over 4.5 s. The default\n> semaphore loop runs 200 iterations with a 5 ms sleep each, giving a\n> maximum wait of 1 s -- not \"200 ms\" as previously stated in error.\n> This is insufficient for X550 family FW update operations and causes\n> spurious EBUSY failures.\n> \n> Extend the SW/FW semaphore timeout from 1 s to 5 s (1000 iterations x\n> 5 ms) for all three X550 variants: ixgbe_mac_X550, ixgbe_mac_X550EM_x,\n> and ixgbe_mac_x550em_a. All three share the same FW and exhibit the\n> same worst-case latency. Use three explicit mac.type comparisons rather\n> than a range check so future MAC additions are not inadvertently\n> captured.\n> \n> The timeout variable is set immediately before the loop so the intent\n> is clear, with an inline comment stating the resulting maximum delay.\n> \n> Suggested-by: Soumen Karmakar \n> Cc: stable@vger.kernel.org\n> Suggested-by: Marta Plantykow \n> Signed-off-by: Aleksandr Loktionov \n> ---\n> v1 -> v2:\n> - Squash with 0015 (X550EM extension); fix commit message (\"200ms\" was\n> wrong, actual default is 1 s); replace >= / <= range check with three\n> explicit mac.type == comparisons per Tony Nguyen.\n> \n> drivers/net/ethernet/intel/ixgbe/ixgbe_x540.c | 8 ++++++++\n> 1 file changed, 8 insertions(+)\n> \n> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_x540.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_x540.c\n> index e67e2fe..a3c8f51 100644\n> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_x540.c\n> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_x540.c\n> @@ -577,6 +577,15 @@ int ixgbe_acquire_swfw_sync_X540(struct ixgbe_hw *hw, u32 mask)\n> \n> \tswmask |= swi2c_mask;\n> \tfwmask |= swi2c_mask << 2;\n> +\t/* Extend to 5 s (1000 x 5 ms) for X550 family; default is 1 s\n> +\t * (200 x 5 ms). FW SR-dump takes up to 3.2 s; module-update up\n> +\t * to 4.5 s.\n> +\t */\n> +\tif (hw->mac.type == ixgbe_mac_X550 ||\n> +\t hw->mac.type == ixgbe_mac_X550EM_x ||\n> +\t hw->mac.type == ixgbe_mac_x550em_a)\n> +\t\ttimeout = 1000;\n> +\n\nTypically, I would request and prefer if we would refactor timeout loops\nlike this to use read_poll_timeout() instead of open coding the loop\nlike we do here. The current loop is somewhat complicated so I can\nunderstand it might be tricky to refactor.\n\nThe issue with open coded loops like this is that usleep_range has\nvariable length waiting time, so we sleep for anywhere between 5 and 6\nmilliseconds in this case. This makes the total amount of time waiting\ncap at 6 seconds and not the expected 5, with the actual amount of time\nwaiting being variable based on when the usleep_range wakes up.\n\nPerhaps this specific loop is a bit more complicated and not worth the\neffort to refactor to read_poll_timeout, but its something I've been\ntrying to get us to cleanup (both inside Intel drivers and in other\nplaces in the kernel) when modifying such open-coded timeout loops.\n\nSince this loop body is a bit more complicated (it has to take and\nrelease the semaphore to check the condition) I can accept it doesn't\nmake sense to modify it here for net.\n\nReviewed-by: Jacob Keller \n\nThanks,\nJake\n\n> \tfor (i = 0; i < timeout; i++) {\n> \t\t/* SW NVM semaphore bit is used for access to all\n> \t\t * SW_FW_SYNC bits (not just NVM)","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=osuosl.org header.i=@osuosl.org header.a=rsa-sha256\n header.s=default header.b=mWwbRsrm;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=osuosl.org\n (client-ip=2605:bc80:3010::137; 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