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Message-Id: <20250210-igb_irq-v1-2-bde078cdb9df@linutronix.de>
Date: Mon, 10 Feb 2025 10:19:36 +0100
From: Kurt Kanzenbach <kurt@...utronix.de>
To: Tony Nguyen <anthony.l.nguyen@...el.com>,
Przemek Kitszel <przemyslaw.kitszel@...el.com>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
Joe Damato <jdamato@...tly.com>, intel-wired-lan@...ts.osuosl.org,
netdev@...r.kernel.org, Kurt Kanzenbach <kurt@...utronix.de>
Subject: [PATCH 2/3] igb: Link queues to NAPI instances
Link queues to NAPI instances via netdev-genl API. This is required to use
XDP/ZC busy polling. See commit 5ef44b3cb43b ("xsk: Bring back busy polling
support") for details.
This also allows users to query the info with netlink:
|$ ./tools/net/ynl/pyynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
| --dump queue-get --json='{"ifindex": 2}'
|[{'id': 0, 'ifindex': 2, 'napi-id': 8201, 'type': 'rx'},
| {'id': 1, 'ifindex': 2, 'napi-id': 8202, 'type': 'rx'},
| {'id': 2, 'ifindex': 2, 'napi-id': 8203, 'type': 'rx'},
| {'id': 3, 'ifindex': 2, 'napi-id': 8204, 'type': 'rx'},
| {'id': 0, 'ifindex': 2, 'napi-id': 8201, 'type': 'tx'},
| {'id': 1, 'ifindex': 2, 'napi-id': 8202, 'type': 'tx'},
| {'id': 2, 'ifindex': 2, 'napi-id': 8203, 'type': 'tx'},
| {'id': 3, 'ifindex': 2, 'napi-id': 8204, 'type': 'tx'}]
While at __igb_open() use RCT coding style.
Signed-off-by: Kurt Kanzenbach <kurt@...utronix.de>
---
drivers/net/ethernet/intel/igb/igb.h | 2 ++
drivers/net/ethernet/intel/igb/igb_main.c | 35 ++++++++++++++++++++++++++-----
drivers/net/ethernet/intel/igb/igb_xsk.c | 2 ++
3 files changed, 34 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/intel/igb/igb.h b/drivers/net/ethernet/intel/igb/igb.h
index 02f340280d20a6f7e32bbd3dfcbb9c1c7b4c6662..79eca385a751bfdafdf384928b6cc1b350b22560 100644
--- a/drivers/net/ethernet/intel/igb/igb.h
+++ b/drivers/net/ethernet/intel/igb/igb.h
@@ -722,6 +722,8 @@ enum igb_boards {
extern char igb_driver_name[];
+void igb_set_queue_napi(struct igb_adapter *adapter, int q_idx,
+ struct napi_struct *napi);
int igb_xmit_xdp_ring(struct igb_adapter *adapter,
struct igb_ring *ring,
struct xdp_frame *xdpf);
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index d4128d19cc08f62f95682069bb5ed9b8bbbf10cb..8e964484f4c9854e4e3e0b4f3e8785fe93bd1207 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -2099,6 +2099,22 @@ static void igb_check_swap_media(struct igb_adapter *adapter)
wr32(E1000_CTRL_EXT, ctrl_ext);
}
+void igb_set_queue_napi(struct igb_adapter *adapter, int vector,
+ struct napi_struct *napi)
+{
+ struct igb_q_vector *q_vector = adapter->q_vector[vector];
+
+ 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);
+}
+
/**
* igb_up - Open the interface and prepare it to handle traffic
* @adapter: board private structure
@@ -2106,6 +2122,7 @@ static void igb_check_swap_media(struct igb_adapter *adapter)
int igb_up(struct igb_adapter *adapter)
{
struct e1000_hw *hw = &adapter->hw;
+ struct napi_struct *napi;
int i;
/* hardware has been reset, we need to reload some things */
@@ -2113,8 +2130,11 @@ int igb_up(struct igb_adapter *adapter)
clear_bit(__IGB_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);
+ igb_set_queue_napi(adapter, i, napi);
+ }
if (adapter->flags & IGB_FLAG_HAS_MSIX)
igb_configure_msix(adapter);
@@ -2184,6 +2204,7 @@ void igb_down(struct igb_adapter *adapter)
for (i = 0; i < adapter->num_q_vectors; i++) {
if (adapter->q_vector[i]) {
napi_synchronize(&adapter->q_vector[i]->napi);
+ igb_set_queue_napi(adapter, i, NULL);
napi_disable(&adapter->q_vector[i]->napi);
}
}
@@ -4116,8 +4137,9 @@ static int igb_sw_init(struct igb_adapter *adapter)
static int __igb_open(struct net_device *netdev, bool resuming)
{
struct igb_adapter *adapter = netdev_priv(netdev);
- struct e1000_hw *hw = &adapter->hw;
struct pci_dev *pdev = adapter->pdev;
+ struct e1000_hw *hw = &adapter->hw;
+ struct napi_struct *napi;
int err;
int i;
@@ -4169,8 +4191,11 @@ static int __igb_open(struct net_device *netdev, bool resuming)
/* From here on the code is the same as igb_up() */
clear_bit(__IGB_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);
+ igb_set_queue_napi(adapter, i, napi);
+ }
/* Clear any pending interrupts. */
rd32(E1000_TSICR);
diff --git a/drivers/net/ethernet/intel/igb/igb_xsk.c b/drivers/net/ethernet/intel/igb/igb_xsk.c
index 157d43787fa0b55a74714f69e9e7903b695fcf0a..a5ad090dfe94b6afc8194fe39d28cdd51c7067b0 100644
--- a/drivers/net/ethernet/intel/igb/igb_xsk.c
+++ b/drivers/net/ethernet/intel/igb/igb_xsk.c
@@ -45,6 +45,7 @@ static void igb_txrx_ring_disable(struct igb_adapter *adapter, u16 qid)
synchronize_net();
/* Rx/Tx share the same napi context. */
+ igb_set_queue_napi(adapter, qid, NULL);
napi_disable(&rx_ring->q_vector->napi);
igb_clean_tx_ring(tx_ring);
@@ -78,6 +79,7 @@ static void igb_txrx_ring_enable(struct igb_adapter *adapter, u16 qid)
/* Rx/Tx share the same napi context. */
napi_enable(&rx_ring->q_vector->napi);
+ igb_set_queue_napi(adapter, qid, &rx_ring->q_vector->napi);
}
struct xsk_buff_pool *igb_xsk_pool(struct igb_adapter *adapter,
--
2.39.5
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