idpf: add XSk pool initialization

Add functionality to setup an XSk buffer pool, including ability to
stop, reconfig and start only selected queues, not the whole device.
Pool DMA mapping is managed by libeth_xdp.

Signed-off-by: Michal Kubiak <michal.kubiak@intel.com>
Signed-off-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Tested-by: Ramu R <ramu.r@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 57 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/idpf/xsk.c b/drivers/net/ethernet/intel/idpf/xsk.c
new file mode 100644
index 000000000000..2098bf160df7
--- /dev/null
+++ b/drivers/net/ethernet/intel/idpf/xsk.c
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (C) 2025 Intel Corporation */
+
+#include <net/libeth/xsk.h>
+
+#include "idpf.h"
+#include "xsk.h"
+
+int idpf_xsk_pool_setup(struct idpf_vport *vport, struct netdev_bpf *bpf)
+{
+	struct xsk_buff_pool *pool = bpf->xsk.pool;
+	u32 qid = bpf->xsk.queue_id;
+	bool restart;
+	int ret;
+
+	restart = idpf_xdp_enabled(vport) && netif_running(vport->netdev);
+	if (!restart)
+		goto pool;
+
+	ret = idpf_qp_switch(vport, qid, false);
+	if (ret) {
+		NL_SET_ERR_MSG_FMT_MOD(bpf->extack,
+				       "%s: failed to disable queue pair %u: %pe",
+				       netdev_name(vport->netdev), qid,
+				       ERR_PTR(ret));
+		return ret;
+	}
+
+pool:
+	ret = libeth_xsk_setup_pool(vport->netdev, qid, pool);
+	if (ret) {
+		NL_SET_ERR_MSG_FMT_MOD(bpf->extack,
+				       "%s: failed to configure XSk pool for pair %u: %pe",
+				       netdev_name(vport->netdev), qid,
+				       ERR_PTR(ret));
+		return ret;
+	}
+
+	if (!restart)
+		return 0;
+
+	ret = idpf_qp_switch(vport, qid, true);
+	if (ret) {
+		NL_SET_ERR_MSG_FMT_MOD(bpf->extack,
+				       "%s: failed to enable queue pair %u: %pe",
+				       netdev_name(vport->netdev), qid,
+				       ERR_PTR(ret));
+		goto err_dis;
+	}
+
+	return 0;
+
+err_dis:
+	libeth_xsk_setup_pool(vport->netdev, qid, false);
+
+	return ret;
+}