[PATCH net-next v4 2/6] net: bcmgenet: register xdp_rxq_info for each RX ring

[Nicolai Buchwitz]

Register an xdp_rxq_info per RX ring and associate it with the ring's
page_pool via MEM_TYPE_PAGE_POOL. This is required infrastructure for
XDP program execution: the XDP framework needs to know the memory model
backing each RX queue for correct page lifecycle management.

No functional change - XDP programs are not yet attached or executed.

Signed-off-by: Nicolai Buchwitz <nb@xxxxxxxxxxx>
---
 drivers/net/ethernet/broadcom/genet/bcmgenet.c | 18 ++++++++++++++++++
 drivers/net/ethernet/broadcom/genet/bcmgenet.h |  2 ++
 2 files changed, 20 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index f32acacadcf0..9f81192d9e31 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -2780,7 +2780,23 @@ static int bcmgenet_rx_ring_create_pool(struct bcmgenet_priv *priv,
 		return err;
 	}
 
+	err = xdp_rxq_info_reg(&ring->xdp_rxq, priv->dev, ring->index, 0);
+	if (err)
+		goto err_free_pp;
+
+	err = xdp_rxq_info_reg_mem_model(&ring->xdp_rxq, MEM_TYPE_PAGE_POOL,
+					 ring->page_pool);
+	if (err)
+		goto err_unreg_rxq;
+
 	return 0;
+
+err_unreg_rxq:
+	xdp_rxq_info_unreg(&ring->xdp_rxq);
+err_free_pp:
+	page_pool_destroy(ring->page_pool);
+	ring->page_pool = NULL;
+	return err;
 }
 
 /* Initialize a RDMA ring */
@@ -2809,6 +2825,7 @@ static int bcmgenet_init_rx_ring(struct bcmgenet_priv *priv,
 	if (ret) {
 		for (i = 0; i < ring->size; i++)
 			bcmgenet_free_rx_cb(ring->cbs + i, ring->page_pool);
+		xdp_rxq_info_unreg(&ring->xdp_rxq);
 		page_pool_destroy(ring->page_pool);
 		ring->page_pool = NULL;
 		return ret;
@@ -3014,6 +3031,7 @@ static void bcmgenet_destroy_rx_page_pools(struct bcmgenet_priv *priv)
 	for (i = 0; i <= priv->hw_params->rx_queues; ++i) {
 		ring = &priv->rx_rings[i];
 		if (ring->page_pool) {
+			xdp_rxq_info_unreg(&ring->xdp_rxq);
 			page_pool_destroy(ring->page_pool);
 			ring->page_pool = NULL;
 		}
diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.h b/drivers/net/ethernet/broadcom/genet/bcmgenet.h
index 11a0ec563a89..82a6d29f481d 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.h
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.h
@@ -16,6 +16,7 @@
 #include <linux/dim.h>
 #include <linux/ethtool.h>
 #include <net/page_pool/helpers.h>
+#include <net/xdp.h>
 
 #include "../unimac.h"
 
@@ -579,6 +580,7 @@ struct bcmgenet_rx_ring {
 	u32		rx_max_coalesced_frames;
 	u32		rx_coalesce_usecs;
 	struct page_pool *page_pool;
+	struct xdp_rxq_info xdp_rxq;
 	struct bcmgenet_priv *priv;
 };
 
-- 
2.51.0