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[95.168.203.222]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ab2c95b299dsm597600166b.160.2025.01.14.00.32.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 14 Jan 2025 00:32:27 -0800 (PST) Message-ID: Date: Tue, 14 Jan 2025 09:32:26 +0100 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [Question] Generic way to retrieve IRQ number of Tx/Rx queue To: Jakub Kicinski Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, intel-wired-lan@lists.osuosl.org References: <20250113131508.79c8511a@kernel.org> Content-Language: en-US From: Daniel Sedlak In-Reply-To: <20250113131508.79c8511a@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 1/13/25 10:15 PM, Jakub Kicinski wrote: > 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: Thank you for the link, I somehow missed that part of netlink… > $ 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.. Thank you for directions, will check Intel's mailing list and poke around with implementing that. Daniel