igb: Introduce XSK data structures and helpers

Add the following ring flag:
- IGB_RING_FLAG_TX_DISABLED (when xsk pool is being setup)

Add a xdp_buff array for use with XSK receive batch API, and a pointer
to xsk_pool in igb_adapter.

Add enable/disable functions for TX and RX rings.
Add enable/disable functions for XSK pool.
Add xsk wakeup function.

None of the above functionality will be active until
NETDEV_XDP_ACT_XSK_ZEROCOPY is advertised in netdev->xdp_features.

Signed-off-by: Sriram Yagnaraman <sriram.yagnaraman@est.tech>
[Kurt: Add READ/WRITE_ONCE(), synchronize_net(),
       remove IGB_RING_FLAG_AF_XDP_ZC]
Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Tested-by: George Kuruvinakunnel <george.kuruvinakunnel@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Link: https://patch.msgid.link/20250106221929.956999-4-anthony.l.nguyen@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index fef58c55eb43..8329096af8ef 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -2908,9 +2908,14 @@ static int igb_xdp_setup(struct net_device *dev, struct netdev_bpf *bpf)
 
 static int igb_xdp(struct net_device *dev, struct netdev_bpf *xdp)
 {
+	struct igb_adapter *adapter = netdev_priv(dev);
+
 	switch (xdp->command) {
 	case XDP_SETUP_PROG:
 		return igb_xdp_setup(dev, xdp);
+	case XDP_SETUP_XSK_POOL:
+		return igb_xsk_pool_setup(adapter, xdp->xsk.pool,
+					  xdp->xsk.queue_id);
 	default:
 		return -EINVAL;
 	}
@@ -3019,6 +3024,7 @@ static const struct net_device_ops igb_netdev_ops = {
 	.ndo_setup_tc		= igb_setup_tc,
 	.ndo_bpf		= igb_xdp,
 	.ndo_xdp_xmit		= igb_xdp_xmit,
+	.ndo_xsk_wakeup         = igb_xsk_wakeup,
 };
 
 /**
@@ -4341,6 +4347,8 @@ void igb_configure_tx_ring(struct igb_adapter *adapter,
 	u64 tdba = ring->dma;
 	int reg_idx = ring->reg_idx;
 
+	WRITE_ONCE(ring->xsk_pool, igb_xsk_pool(adapter, ring));
+
 	wr32(E1000_TDLEN(reg_idx),
 	     ring->count * sizeof(union e1000_adv_tx_desc));
 	wr32(E1000_TDBAL(reg_idx),
@@ -4736,6 +4744,7 @@ void igb_configure_rx_ring(struct igb_adapter *adapter,
 	xdp_rxq_info_unreg_mem_model(&ring->xdp_rxq);
 	WARN_ON(xdp_rxq_info_reg_mem_model(&ring->xdp_rxq,
 					   MEM_TYPE_PAGE_SHARED, NULL));
+	WRITE_ONCE(ring->xsk_pool, igb_xsk_pool(adapter, ring));
 
 	/* disable the queue */
 	wr32(E1000_RXDCTL(reg_idx), 0);