| Message ID | 20241014213012.187976-3-jdamato@fastly.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | igc: Link IRQs and queues to NAPIs | expand |
Joe Damato <jdamato@fastly.com> writes: > 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 <jdamato@fastly.com> > --- > 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); > + } > + } > +} It seems that igc_unset_queue_napi() is igc_set_queue_napi(x, y, NULL), so I would suggest either implementing "unset" in terms of "set", or using igc_set_queue_napi(x, y, NULL) directly in the "unlink" case (I have a slight preference for the second option). > + > /** > * 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); > -- > 2.25.1 > Cheers,
On Mon, Oct 14, 2024 at 06:51:57PM -0700, Vinicius Costa Gomes wrote: > Joe Damato <jdamato@fastly.com> writes: [...] > > +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); > > + } > > + } > > +} > > It seems that igc_unset_queue_napi() is igc_set_queue_napi(x, y, NULL), > so I would suggest either implementing "unset" in terms of "set", or > using igc_set_queue_napi(x, y, NULL) directly in the "unlink" case (I > have a slight preference for the second option). Ah, yes, of course. That is much simpler; I'll go with the second option for the v3. Thank you for catching that in your review. Unless any other significant feedback comes in, I'll likely send the v3 as a PATCH instead of an RFC later this week.
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='{"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 <jdamato@fastly.com> > --- > 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); > + } > + } > +} 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 = 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
On Tue, Oct 15, 2024 at 12:27:01PM +0200, Kurt Kanzenbach wrote: > 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='{"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 <jdamato@fastly.com> > > --- > > 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); > > + } > > + } > > +} > > 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 = 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); > } Ah, yes, that is much simpler. Thanks for the suggestion. I'll do that for the v3.
On Tue, Oct 15, 2024 at 12:27:01PM +0200, Kurt Kanzenbach wrote: > On Mon Oct 14 2024, Joe Damato wrote: [...] > > 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); > > + } > > + } > > +} > > 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 = 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); > } I tried this suggestion but this does not result in correct output in the case where IGC_FLAG_QUEUE_PAIRS is disabled. The output from netlink: $ ./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, 'type': 'tx'}, {'id': 1, 'ifindex': 2, 'type': 'tx'}] Note the lack of a napi-id for the TX queues. This typically happens when the linking is not done correctly; netif_queue_set_napi should take a queue id as the second parameter. I believe the suggested code above should be modified to be as follows to use ring->queue_index: if (q_vector->rx.ring) netif_queue_set_napi(adapter->netdev, q_vector->rx.ring->queue_index, NETDEV_QUEUE_TYPE_RX, napi); if (q_vector->tx.ring) netif_queue_set_napi(adapter->netdev, q_vector->tx.ring->queue_index, NETDEV_QUEUE_TYPE_TX, napi); Which produces correct output: $ ./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'}] I wanted to send you a note about this before I post the v3 so that if/when you review it you'll have the context as to why the v3 code is slightly different than what was suggested.
On Fri Oct 18 2024, Joe Damato wrote: > On Tue, Oct 15, 2024 at 12:27:01PM +0200, Kurt Kanzenbach wrote: >> On Mon Oct 14 2024, Joe Damato wrote: > > [...] > >> > 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); >> > + } >> > + } >> > +} >> >> 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 = 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); >> } > > I tried this suggestion but this does not result in correct output > in the case where IGC_FLAG_QUEUE_PAIRS is disabled. > > The output from netlink: > > $ ./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, 'type': 'tx'}, > {'id': 1, 'ifindex': 2, 'type': 'tx'}] > > Note the lack of a napi-id for the TX queues. This typically happens > when the linking is not done correctly; netif_queue_set_napi should > take a queue id as the second parameter. > > I believe the suggested code above should be modified to be as > follows to use ring->queue_index: > > if (q_vector->rx.ring) > netif_queue_set_napi(adapter->netdev, > q_vector->rx.ring->queue_index, > NETDEV_QUEUE_TYPE_RX, napi); > > if (q_vector->tx.ring) > netif_queue_set_napi(adapter->netdev, > q_vector->tx.ring->queue_index, > NETDEV_QUEUE_TYPE_TX, napi); LGTM. Thanks.
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);
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 <jdamato@fastly.com> --- 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(-)