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bh=ZpIqGV3FZABzIvwPIJ5wx08SyD5BMrHZo4Js9GlnC54=; b=XNFspYlioZsgZddnrxGs0PI4T2EM6GhW1kvaym/ivzoAGUyjWZm91IPy6KSuszl8vAPU0I ciNVLtnKOz/v3TBQ== X-Mailman-Original-Authentication-Results: smtp1.osuosl.org; dmarc=pass (p=none dis=none) header.from=linutronix.de X-Mailman-Original-Authentication-Results: smtp1.osuosl.org; dkim=pass (2048-bit key, unprotected) header.d=linutronix.de header.i=@linutronix.de header.a=rsa-sha256 header.s=2020 header.b=B0/fQViY; dkim=pass header.d=linutronix.de header.i=@linutronix.de header.a=ed25519-sha256 header.s=2020e header.b=XNFspYli Subject: Re: [Intel-wired-lan] [RFC net-next v2 2/2] igc: Link queues to NAPI instances X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jesper Dangaard Brouer , Daniel Borkmann , vinicius.gomes@intel.com, Przemek Kitszel , Joe Damato , John Fastabend , Alexei Starovoitov , open list , Eric Dumazet , Tony Nguyen , "moderated list:INTEL ETHERNET DRIVERS" , Jakub Kicinski , "open list:XDP \(eXpress Data Path\)" , Paolo Abeni , "David S. Miller" Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" --=-=-= Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Mon Oct 14 2024, Joe Damato wrote: > Link queues to NAPI instances via netdev-genl API so that users can > query this information with netlink. Handle a few cases in the driver: > 1. Link/unlink the NAPIs when XDP is enabled/disabled > 2. Handle IGC_FLAG_QUEUE_PAIRS enabled and disabled > > Example output when IGC_FLAG_QUEUE_PAIRS is enabled: > > $ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \ > --dump queue-get --json=3D'{"ifindex": 2}' > > [{'id': 0, 'ifindex': 2, 'napi-id': 8193, 'type': 'rx'}, > {'id': 1, 'ifindex': 2, 'napi-id': 8194, 'type': 'rx'}, > {'id': 2, 'ifindex': 2, 'napi-id': 8195, 'type': 'rx'}, > {'id': 3, 'ifindex': 2, 'napi-id': 8196, 'type': 'rx'}, > {'id': 0, 'ifindex': 2, 'napi-id': 8193, 'type': 'tx'}, > {'id': 1, 'ifindex': 2, 'napi-id': 8194, 'type': 'tx'}, > {'id': 2, 'ifindex': 2, 'napi-id': 8195, 'type': 'tx'}, > {'id': 3, 'ifindex': 2, 'napi-id': 8196, 'type': 'tx'}] > > Since IGC_FLAG_QUEUE_PAIRS is enabled, you'll note that the same NAPI ID > is present for both rx and tx queues at the same index, for example > index 0: > > {'id': 0, 'ifindex': 2, 'napi-id': 8193, 'type': 'rx'}, > {'id': 0, 'ifindex': 2, 'napi-id': 8193, 'type': 'tx'}, > > To test IGC_FLAG_QUEUE_PAIRS disabled, a test system was booted using > the grub command line option "maxcpus=3D2" to force > igc_set_interrupt_capability to disable IGC_FLAG_QUEUE_PAIRS. > > Example output when IGC_FLAG_QUEUE_PAIRS is disabled: > > $ lscpu | grep "On-line CPU" > On-line CPU(s) list: 0,2 > > $ ethtool -l enp86s0 | tail -5 > Current hardware settings: > RX: n/a > TX: n/a > Other: 1 > Combined: 2 > > $ cat /proc/interrupts | grep enp > 144: [...] enp86s0 > 145: [...] enp86s0-rx-0 > 146: [...] enp86s0-rx-1 > 147: [...] enp86s0-tx-0 > 148: [...] enp86s0-tx-1 > > 1 "other" IRQ, and 2 IRQs for each of RX and Tx, so we expect netlink to > report 4 IRQs with unique NAPI IDs: > > $ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \ > --dump napi-get --json=3D'{"ifindex": 2}' > [{'id': 8196, 'ifindex': 2, 'irq': 148}, > {'id': 8195, 'ifindex': 2, 'irq': 147}, > {'id': 8194, 'ifindex': 2, 'irq': 146}, > {'id': 8193, 'ifindex': 2, 'irq': 145}] > > Now we examine which queues these NAPIs are associated with, expecting > that since IGC_FLAG_QUEUE_PAIRS is disabled each RX and TX queue will > have its own NAPI instance: > > $ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \ > --dump queue-get --json=3D'{"ifindex": 2}' > [{'id': 0, 'ifindex': 2, 'napi-id': 8193, 'type': 'rx'}, > {'id': 1, 'ifindex': 2, 'napi-id': 8194, 'type': 'rx'}, > {'id': 0, 'ifindex': 2, 'napi-id': 8195, 'type': 'tx'}, > {'id': 1, 'ifindex': 2, 'napi-id': 8196, 'type': 'tx'}] > > Signed-off-by: Joe Damato > --- > v2: > - Update commit message to include tests for IGC_FLAG_QUEUE_PAIRS > disabled > - Refactored code to move napi queue mapping and unmapping to helper > functions igc_set_queue_napi and igc_unset_queue_napi > - Adjust the code to handle IGC_FLAG_QUEUE_PAIRS disabled > - Call helpers to map/unmap queues to NAPIs in igc_up, __igc_open, > igc_xdp_enable_pool, and igc_xdp_disable_pool > > drivers/net/ethernet/intel/igc/igc.h | 3 ++ > drivers/net/ethernet/intel/igc/igc_main.c | 58 +++++++++++++++++++++-- > drivers/net/ethernet/intel/igc/igc_xdp.c | 2 + > 3 files changed, 59 insertions(+), 4 deletions(-) > > diff --git a/drivers/net/ethernet/intel/igc/igc.h b/drivers/net/ethernet/= intel/igc/igc.h > index eac0f966e0e4..7b1c9ea60056 100644 > --- a/drivers/net/ethernet/intel/igc/igc.h > +++ b/drivers/net/ethernet/intel/igc/igc.h > @@ -337,6 +337,9 @@ struct igc_adapter { > struct igc_led_classdev *leds; > }; >=20=20 > +void igc_set_queue_napi(struct igc_adapter *adapter, int q_idx, > + struct napi_struct *napi); > +void igc_unset_queue_napi(struct igc_adapter *adapter, int q_idx); > void igc_up(struct igc_adapter *adapter); > void igc_down(struct igc_adapter *adapter); > int igc_open(struct net_device *netdev); > diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethe= rnet/intel/igc/igc_main.c > index 7964bbedb16c..59c00acfa0ed 100644 > --- a/drivers/net/ethernet/intel/igc/igc_main.c > +++ b/drivers/net/ethernet/intel/igc/igc_main.c > @@ -4948,6 +4948,47 @@ static int igc_sw_init(struct igc_adapter *adapter) > return 0; > } >=20=20 > +void igc_set_queue_napi(struct igc_adapter *adapter, int q_idx, > + struct napi_struct *napi) > +{ > + if (adapter->flags & IGC_FLAG_QUEUE_PAIRS) { > + netif_queue_set_napi(adapter->netdev, q_idx, > + NETDEV_QUEUE_TYPE_RX, napi); > + netif_queue_set_napi(adapter->netdev, q_idx, > + NETDEV_QUEUE_TYPE_TX, napi); > + } else { > + if (q_idx < adapter->num_rx_queues) { > + netif_queue_set_napi(adapter->netdev, q_idx, > + NETDEV_QUEUE_TYPE_RX, napi); > + } else { > + q_idx -=3D adapter->num_rx_queues; > + netif_queue_set_napi(adapter->netdev, q_idx, > + NETDEV_QUEUE_TYPE_TX, napi); > + } > + } > +} In addition, to what Vinicius said. I think this can be done simpler. Something like this? void igc_set_queue_napi(struct igc_adapter *adapter, int vector, struct napi_struct *napi) { struct igc_q_vector *q_vector =3D adapter->q_vector[vector]; if (q_vector->rx.ring) netif_queue_set_napi(adapter->netdev, vector, NETDEV_QUEUE_TYPE_RX, napi); if (q_vector->tx.ring) netif_queue_set_napi(adapter->netdev, vector, NETDEV_QUEUE_TYPE_TX, napi); } Thanks, Kurt --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQJHBAEBCgAxFiEEvLm/ssjDfdPf21mSwZPR8qpGc4IFAmcOQ3UTHGt1cnRAbGlu dXRyb25peC5kZQAKCRDBk9HyqkZzggP+EACbgGaNTWYbIcp1ENi3SQd4VQWHfX4P NLZHtOiG+aBHjfLRpW+pHulbwJ4+fn/XOIoWc1HyoS3IjF95CKAiwK8SNPBivGb9 5zRmEqoz0yUZHJjdhZIboVwAZ9/1O92eE3gwtE++LW0oEoBcE4TqItDeZgQJ/jb8 zdmXp0pxQns7TEfFv5cDPTnnxZJgbbyDBHr9Le0jA27/hMwDzclgHqgpqyzoypdD +B99POsjugofhiOVmzvWVYtTQ2Km/7Yt4pc45IAJG7M5sfqly8hfAmvutTuCeE0p NGjW43qgpzCThQCWRL6QgiEqlDHndYAkLjrRxUNBEy2RwMvtZPJCFw54h3XrzfXB /JXen5j1+gaFuFS/tF743VvLprsYPsKnKOa9sYU6ji7uKd6yKml8Rw8XUrWnPwjS hpgzkewBeZVBYOJ/x+odtVMPBiFxhpoSmbhPnPNGs7P5SESJgPAtdkiQNqGzI81Z mFgkNkRTkeyBiJ6NN43diLanEFeH5pGbFs8m7hrXBrAHxQP/c6A09KmCR5XS3Hra dzG7EB+tvIrYfsQiEWwhZEC+j9m2MGT190NusYPX+Gv7d5RgL80vw7XGly5t91el /SO30QNj8yItov0R//NqlZKx76hugTbW4NO+hJLqNCpU0woBG56v5N8y2VSuS4Fh jQrQCDjVYZqMyg== =yqMd -----END PGP SIGNATURE----- --=-=-=--