[PATCH iwl-next v5 04/13] idpf: link NAPIs to queues
From: Alexander Lobakin <aleksander.lobakin@intel.com>
Date: 2025-08-26 16:13:44
Also in:
bpf, intel-wired-lan, lkml
Subsystem:
intel ethernet drivers, networking drivers, the rest · Maintainers:
Tony Nguyen, Przemek Kitszel, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Add the missing linking of NAPIs to netdev queues when enabling
interrupt vectors in order to support NAPI configuration and
interfaces requiring get_rx_queue()->napi to be set (like XSk
busy polling).
As currently, idpf_vport_{start,stop}() is called from several flows
with inconsistent RTNL locking, we need to synchronize them to avoid
runtime assertions. Notably:
* idpf_{open,stop}() -- regular NDOs, RTNL is always taken;
* idpf_initiate_soft_reset() -- usually called under RTNL;
* idpf_init_task -- called from the init work, needs RTNL;
* idpf_vport_dealloc -- called without RTNL taken, needs it.
Expand common idpf_vport_{start,stop}() to take an additional bool
telling whether we need to manually take the RTNL lock.
Suggested-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> # helper
Signed-off-by: Alexander Lobakin <aleksander.lobakin@intel.com>
---
drivers/net/ethernet/intel/idpf/idpf_lib.c | 38 +++++++++++++++------
drivers/net/ethernet/intel/idpf/idpf_txrx.c | 17 +++++++++
2 files changed, 45 insertions(+), 10 deletions(-)
diff --git a/drivers/net/ethernet/intel/idpf/idpf_lib.c b/drivers/net/ethernet/intel/idpf/idpf_lib.c
index 67236a68f6be..b5a7215488b9 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_lib.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_lib.c@@ -884,14 +884,18 @@ static void idpf_remove_features(struct idpf_vport *vport) /** * idpf_vport_stop - Disable a vport * @vport: vport to disable + * @rtnl: whether to take RTNL lock */ -static void idpf_vport_stop(struct idpf_vport *vport) +static void idpf_vport_stop(struct idpf_vport *vport, bool rtnl) { struct idpf_netdev_priv *np = netdev_priv(vport->netdev); if (np->state <= __IDPF_VPORT_DOWN) return; + if (rtnl) + rtnl_lock(); + netif_carrier_off(vport->netdev); netif_tx_disable(vport->netdev);
@@ -913,6 +917,9 @@ static void idpf_vport_stop(struct idpf_vport *vport) idpf_vport_queues_rel(vport); idpf_vport_intr_rel(vport); np->state = __IDPF_VPORT_DOWN; + + if (rtnl) + rtnl_unlock(); } /**
@@ -936,7 +943,7 @@ static int idpf_stop(struct net_device *netdev) idpf_vport_ctrl_lock(netdev); vport = idpf_netdev_to_vport(netdev); - idpf_vport_stop(vport); + idpf_vport_stop(vport, false); idpf_vport_ctrl_unlock(netdev);
@@ -1029,7 +1036,7 @@ static void idpf_vport_dealloc(struct idpf_vport *vport) idpf_idc_deinit_vport_aux_device(vport->vdev_info); idpf_deinit_mac_addr(vport); - idpf_vport_stop(vport); + idpf_vport_stop(vport, true); if (!test_bit(IDPF_HR_RESET_IN_PROG, adapter->flags)) idpf_decfg_netdev(vport);
@@ -1370,8 +1377,9 @@ static void idpf_rx_init_buf_tail(struct idpf_vport *vport) /** * idpf_vport_open - Bring up a vport * @vport: vport to bring up + * @rtnl: whether to take RTNL lock */ -static int idpf_vport_open(struct idpf_vport *vport) +static int idpf_vport_open(struct idpf_vport *vport, bool rtnl) { struct idpf_netdev_priv *np = netdev_priv(vport->netdev); struct idpf_adapter *adapter = vport->adapter;
@@ -1381,6 +1389,9 @@ static int idpf_vport_open(struct idpf_vport *vport) if (np->state != __IDPF_VPORT_DOWN) return -EBUSY; + if (rtnl) + rtnl_lock(); + /* we do not allow interface up just yet */ netif_carrier_off(vport->netdev);
@@ -1388,7 +1399,7 @@ static int idpf_vport_open(struct idpf_vport *vport) if (err) { dev_err(&adapter->pdev->dev, "Failed to allocate interrupts for vport %u: %d\n", vport->vport_id, err); - return err; + goto err_rtnl_unlock; } err = idpf_vport_queues_alloc(vport);
@@ -1475,6 +1486,9 @@ static int idpf_vport_open(struct idpf_vport *vport) goto deinit_rss; } + if (rtnl) + rtnl_unlock(); + return 0; deinit_rss:
@@ -1492,6 +1506,10 @@ static int idpf_vport_open(struct idpf_vport *vport) intr_rel: idpf_vport_intr_rel(vport); +err_rtnl_unlock: + if (rtnl) + rtnl_unlock(); + return err; }
@@ -1572,7 +1590,7 @@ void idpf_init_task(struct work_struct *work) np = netdev_priv(vport->netdev); np->state = __IDPF_VPORT_DOWN; if (test_and_clear_bit(IDPF_VPORT_UP_REQUESTED, vport_config->flags)) - idpf_vport_open(vport); + idpf_vport_open(vport, true); /* Spawn and return 'idpf_init_task' work queue until all the * default vports are created
@@ -1962,7 +1980,7 @@ int idpf_initiate_soft_reset(struct idpf_vport *vport, idpf_send_delete_queues_msg(vport); } else { set_bit(IDPF_VPORT_DEL_QUEUES, vport->flags); - idpf_vport_stop(vport); + idpf_vport_stop(vport, false); } idpf_deinit_rss(vport);
@@ -1992,7 +2010,7 @@ int idpf_initiate_soft_reset(struct idpf_vport *vport, goto err_open; if (current_state == __IDPF_VPORT_UP) - err = idpf_vport_open(vport); + err = idpf_vport_open(vport, false); goto free_vport;
@@ -2002,7 +2020,7 @@ int idpf_initiate_soft_reset(struct idpf_vport *vport, err_open: if (current_state == __IDPF_VPORT_UP) - idpf_vport_open(vport); + idpf_vport_open(vport, false); free_vport: kfree(new_vport);
@@ -2240,7 +2258,7 @@ static int idpf_open(struct net_device *netdev) if (err) goto unlock; - err = idpf_vport_open(vport); + err = idpf_vport_open(vport, false); unlock: idpf_vport_ctrl_unlock(netdev);
diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.c b/drivers/net/ethernet/intel/idpf/idpf_txrx.c
index f49791eab07d..0a2a2b21d1ef 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_txrx.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.c@@ -3423,6 +3423,20 @@ void idpf_vport_intr_rel(struct idpf_vport *vport) vport->q_vectors = NULL; } +static void idpf_q_vector_set_napi(struct idpf_q_vector *q_vector, bool link) +{ + struct napi_struct *napi = link ? &q_vector->napi : NULL; + struct net_device *dev = q_vector->vport->netdev; + + for (u32 i = 0; i < q_vector->num_rxq; i++) + netif_queue_set_napi(dev, q_vector->rx[i]->idx, + NETDEV_QUEUE_TYPE_RX, napi); + + for (u32 i = 0; i < q_vector->num_txq; i++) + netif_queue_set_napi(dev, q_vector->tx[i]->idx, + NETDEV_QUEUE_TYPE_TX, napi); +} + /** * idpf_vport_intr_rel_irq - Free the IRQ association with the OS * @vport: main vport structure
@@ -3443,6 +3457,7 @@ static void idpf_vport_intr_rel_irq(struct idpf_vport *vport) vidx = vport->q_vector_idxs[vector]; irq_num = adapter->msix_entries[vidx].vector; + idpf_q_vector_set_napi(q_vector, false); kfree(free_irq(irq_num, q_vector)); } }
@@ -3630,6 +3645,8 @@ static int idpf_vport_intr_req_irq(struct idpf_vport *vport) "Request_irq failed, error: %d\n", err); goto free_q_irqs; } + + idpf_q_vector_set_napi(q_vector, true); } return 0;
--
2.51.0