From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F30381D0B8E; Mon, 13 Jan 2025 21:15:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736802910; cv=none; b=i9pF/LgwuD+iVZbaxk4J73QmOxOFu6dhFo9wFHG2sGsgMSespPj5j8nO9eVYJo4vfQF07dOPNrDuVHo8OIqWmgF/zvBZCxb28SxTH8153Tu6BHW4ZJo87Y7zKXm+JmQlW6sp1o1ZZ45SdiuLQ9VGScasYQCiD9lXxRkgfGO558M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736802910; c=relaxed/simple; bh=d/vrrZJ1Rj5cvhFMT7x8wSnldOnMUjnIQVlF0v9aVmY=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=gPK6aDDjuG1lbEd3PP+sR6ZQR+sC+lRVjHqvt34rxuzI3qqKK+mGQRWD4+IjnFJUbsOpvZyZifQUpG9BSR5Pu5spxPzCW4vRfyyg9x2ZnhF84yEtZb/xJ5V18jV8wXyo4yM43HUCnNONMsPoGRz0Gx82JTaMIxM3HykHb+S+OOs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PCXqmAp/; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="PCXqmAp/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9E2A0C4CED6; Mon, 13 Jan 2025 21:15:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1736802909; bh=d/vrrZJ1Rj5cvhFMT7x8wSnldOnMUjnIQVlF0v9aVmY=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=PCXqmAp/GgADfQuDRU2PZU2Vam9624HBwmuXVwnBo/6sTmVW2DkYSIL1a+2qxSXpF osnBebS2bnCgyXGCYqJEz4R9KU92MaIwzqjUWkJ7R92rHec1yMW1hAYueY69kwksq6 wOLCqHxwRmJa+N9uFeEmVZiFffSMkBwQ1q9xGDs1HIW3tQsIWc0hSCP4qnEAFBYwlS ZRpstr8zeIlJgaAkaySplVA8sRwkIEjW/nmiXgJFznQ1+c+MwJPJDYUx/Cjbym9+U5 Opif4f5K+9siWjqtfZhzNNCL2k559YXE7ijyfmB7A93qWiZWyIN2PXVIm8t0zOlG+k 0suTvB9l25idQ== Date: Mon, 13 Jan 2025 13:15:08 -0800 From: Jakub Kicinski To: Daniel Sedlak Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, intel-wired-lan@lists.osuosl.org Subject: Re: [Question] Generic way to retrieve IRQ number of Tx/Rx queue Message-ID: <20250113131508.79c8511a@kernel.org> In-Reply-To: References: Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Fri, 10 Jan 2025 10:07:18 +0100 Daniel Sedlak wrote: > Hello, > I am writing an affinity scheduler in the userspace for network cards's > Tx/Rx queues. Is there a generic way to retrieve all IRQ numbers for > those queues for each interface? > > My goal is to get all Tx/Rx queues for a given interface, get the IRQ > number of the individual queues, and set an affinity hint for each > queue. I have tried to loop over /proc/interrupts to retrieve all queues > for an interface in a hope that the last column would contain the > interface name however this does not work since the naming is not > unified across drivers. My second attempt was to retrieve all registered > interrupts by network interface from > /sys/class/net/{interface_name}/device/msi_irqs/, but this attempt was > also without luck because some drivers request more IRQs than the number > of queues (for example i40e driver). We do have an API for that https://docs.kernel.org/next/networking/netlink_spec/netdev.html#napi but unfortunately the driver needs to support it, and i40e currently doesn't: $ git grep --files-with-matches netif_napi_set_irq drivers/net/ethernet/amazon/ena/ena_netdev.c drivers/net/ethernet/broadcom/bnxt/bnxt.c drivers/net/ethernet/broadcom/tg3.c drivers/net/ethernet/google/gve/gve_utils.c drivers/net/ethernet/intel/e1000/e1000_main.c drivers/net/ethernet/intel/e1000e/netdev.c drivers/net/ethernet/intel/ice/ice_lib.c drivers/net/ethernet/intel/igc/igc_main.c drivers/net/ethernet/mellanox/mlx4/en_cq.c drivers/net/ethernet/mellanox/mlx5/core/en_main.c drivers/net/ethernet/meta/fbnic/fbnic_txrx.c Should be easy to add. Let me CC the Intel list in case they already have a relevant change queued for i40e..