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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , intel-wired-lan@lists.osuosl.org (moderated list:INTEL ETHERNET DRIVERS), linux-kernel@vger.kernel.org (open list) Subject: [RFC net-next v2 1/2] igc: Link IRQs to NAPI instances Date: Mon, 14 Oct 2024 21:30:10 +0000 Message-Id: <20241014213012.187976-2-jdamato@fastly.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20241014213012.187976-1-jdamato@fastly.com> References: <20241014213012.187976-1-jdamato@fastly.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org X-Patchwork-State: RFC Link IRQs to NAPI instances via netdev-genl API so that users can query this information with netlink. Compare the output of /proc/interrupts (noting that IRQ 144 is the "other" IRQ which does not appear to have a NAPI instance): $ cat /proc/interrupts | grep enp86s0 | cut --delimiter=":" -f1 144 145 146 147 148 The output from netlink shows the mapping of NAPI IDs to IRQs (again noting that 144 is absent as it is the "other" IRQ): $ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \ --dump napi-get --json='{"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}] Signed-off-by: Joe Damato --- v2: - Line wrap at 80 characters drivers/net/ethernet/intel/igc/igc_main.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c index 6e70bca15db1..7964bbedb16c 100644 --- a/drivers/net/ethernet/intel/igc/igc_main.c +++ b/drivers/net/ethernet/intel/igc/igc_main.c @@ -5576,6 +5576,9 @@ static int igc_request_msix(struct igc_adapter *adapter) q_vector); 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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , intel-wired-lan@lists.osuosl.org (moderated list:INTEL ETHERNET DRIVERS), linux-kernel@vger.kernel.org (open list), bpf@vger.kernel.org (open list:XDP (eXpress Data Path)) Subject: [RFC net-next v2 2/2] igc: Link queues to NAPI instances Date: Mon, 14 Oct 2024 21:30:11 +0000 Message-Id: <20241014213012.187976-3-jdamato@fastly.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20241014213012.187976-1-jdamato@fastly.com> References: <20241014213012.187976-1-jdamato@fastly.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org X-Patchwork-State: RFC 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='{"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=2" 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='{"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='{"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; }; +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/ethernet/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; } +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 -= adapter->num_rx_queues; + netif_queue_set_napi(adapter->netdev, q_idx, + NETDEV_QUEUE_TYPE_TX, napi); + } + } +} + +void igc_unset_queue_napi(struct igc_adapter *adapter, int q_idx) +{ + struct net_device *netdev = adapter->netdev; + + if (adapter->flags & IGC_FLAG_QUEUE_PAIRS) { + netif_queue_set_napi(netdev, q_idx, NETDEV_QUEUE_TYPE_RX, + NULL); + netif_queue_set_napi(netdev, q_idx, NETDEV_QUEUE_TYPE_TX, + NULL); + } else { + if (q_idx < adapter->num_rx_queues) { + netif_queue_set_napi(adapter->netdev, q_idx, + NETDEV_QUEUE_TYPE_RX, NULL); + } else { + q_idx -= adapter->num_rx_queues; + netif_queue_set_napi(adapter->netdev, q_idx, + NETDEV_QUEUE_TYPE_TX, NULL); + } + } +} + /** * igc_up - Open the interface and prepare it to handle traffic * @adapter: board private structure @@ -4955,6 +4996,7 @@ static int igc_sw_init(struct igc_adapter *adapter) void igc_up(struct igc_adapter *adapter) { struct igc_hw *hw = &adapter->hw; + struct napi_struct *napi; int i = 0; /* hardware has been reset, we need to reload some things */ @@ -4962,8 +5004,11 @@ void igc_up(struct igc_adapter *adapter) clear_bit(__IGC_DOWN, &adapter->state); - for (i = 0; i < adapter->num_q_vectors; i++) - napi_enable(&adapter->q_vector[i]->napi); + for (i = 0; i < adapter->num_q_vectors; i++) { + napi = &adapter->q_vector[i]->napi; + napi_enable(napi); + igc_set_queue_napi(adapter, i, napi); + } if (adapter->msix_entries) igc_configure_msix(adapter); @@ -5192,6 +5237,7 @@ void igc_down(struct igc_adapter *adapter) for (i = 0; i < adapter->num_q_vectors; i++) { if (adapter->q_vector[i]) { napi_synchronize(&adapter->q_vector[i]->napi); + igc_unset_queue_napi(adapter, i); napi_disable(&adapter->q_vector[i]->napi); } } @@ -6021,6 +6067,7 @@ static int __igc_open(struct net_device *netdev, bool resuming) struct igc_adapter *adapter = netdev_priv(netdev); struct pci_dev *pdev = adapter->pdev; struct igc_hw *hw = &adapter->hw; + struct napi_struct *napi; int err = 0; int i = 0; @@ -6056,8 +6103,11 @@ static int __igc_open(struct net_device *netdev, bool resuming) clear_bit(__IGC_DOWN, &adapter->state); - for (i = 0; i < adapter->num_q_vectors; i++) - napi_enable(&adapter->q_vector[i]->napi); + for (i = 0; i < adapter->num_q_vectors; i++) { + napi = &adapter->q_vector[i]->napi; + napi_enable(napi); + igc_set_queue_napi(adapter, i, napi); + } /* Clear any pending interrupts. */ rd32(IGC_ICR); diff --git a/drivers/net/ethernet/intel/igc/igc_xdp.c b/drivers/net/ethernet/intel/igc/igc_xdp.c index e27af72aada8..886f04b8c394 100644 --- a/drivers/net/ethernet/intel/igc/igc_xdp.c +++ b/drivers/net/ethernet/intel/igc/igc_xdp.c @@ -84,6 +84,7 @@ static int igc_xdp_enable_pool(struct igc_adapter *adapter, napi_disable(napi); } + igc_unset_queue_napi(adapter, queue_id); set_bit(IGC_RING_FLAG_AF_XDP_ZC, &rx_ring->flags); set_bit(IGC_RING_FLAG_AF_XDP_ZC, &tx_ring->flags); @@ -133,6 +134,7 @@ static int igc_xdp_disable_pool(struct igc_adapter *adapter, u16 queue_id) xsk_pool_dma_unmap(pool, IGC_RX_DMA_ATTR); clear_bit(IGC_RING_FLAG_AF_XDP_ZC, &rx_ring->flags); clear_bit(IGC_RING_FLAG_AF_XDP_ZC, &tx_ring->flags); + igc_set_queue_napi(adapter, queue_id, napi); if (needs_reset) { napi_enable(napi);