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[128.12.123.100]) by smtp.gmail.com with ESMTPSA id l4sm17949526pfc.121.2021.11.01.12.16.15 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 01 Nov 2021 12:16:15 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 15.0 \(3693.20.0.1.32\)) Subject: Re: Enable RX interrupts From: Jack Humphries In-Reply-To: <20211101082006.168c25ea@hermes.local> Date: Mon, 1 Nov 2021 12:16:14 -0700 Cc: users@dpdk.org Content-Transfer-Encoding: quoted-printable Message-Id: References: <73CAB2FD-77CD-4C84-BE8B-F100A1CA55F3@chillysky.com> <20211101082006.168c25ea@hermes.local> To: Stephen Hemminger X-Mailer: Apple Mail (2.3693.20.0.1.32) X-BeenThere: users@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK usage discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: users-bounces@dpdk.org Archived-At: List-Archive: Thanks Stephen. I am just using one RX queue from the NIC. I assume that = since I don=E2=80=99t need per-queue interrupts here since there is only = one queue, I should be good using ixgbe+igb_uio? Thanks, Jack > On Nov 1, 2021, at 8:20 AM, Stephen Hemminger = wrote: >=20 > On Sun, 31 Oct 2021 22:50:40 -0700 > Jack Humphries wrote: >=20 >> Hi folks, >>=20 >> Hope all are well. I=E2=80=99m trying to enable interrupts in DPDK so = that my network receive thread can sleep on an epoll until packets = arrive. I am using the ixgbe kernel driver and igb_uio userspace driver = with an Intel 82599ES 10Gbps NIC. >>=20 >> I'm doing roughly the following to enable the interrupts, but the = epoll never indicates that packets have arrived. The thread only handles = packets when the epoll times out. I don't even see interrupts arrive = from the device when monitoring /proc/interrupts. >>=20 >> port_conf.intr_conf.rxq =3D 1; >>=20 >> ... >>=20 >> CHECK_EQ(rte_eth_dev_rx_intr_ctl_q(kPort, kQueue, = RTE_EPOLL_PER_THREAD, >> RTE_INTR_EVENT_ADD, nullptr), >> 0);=20 >> CHECK_EQ(rte_eth_dev_rx_intr_enable(kPort, kQueue), 0); >>=20 >> ... >>=20 >> rte_epoll_event event; >> while (true) { >> int n =3D rte_epoll_wait(RTE_EPOLL_PER_THREAD, &event, = /*maxevents=3D*/1, >> /*timeout=3D*/1000); >> if (n =3D=3D 0) { >> // Timeout expired. >> } else { >> // Received RX interrupt. >> } >> } >>=20 >> Given that I don't see anything coming through in /proc/interrupts, I = am going to start digging through the ixgbe driver. However, I wanted to = ask here first to see if my setup is missing anything obvious. I based = it closely on the l3fwd-power example, though I haven't been able to get = that example up and running yet since my NIC only has one port plugged = in right now and the example requires two (COVID building restrictions). >=20 > If you are going to use interrupts you need to have MSI-X to get = per-queue interrupts. > The igb_uio driver doesn't support this; you need to use vfio-pci in = kernel to get queue interrupts.