IB/hfi1: Add functions to receive accelerated ipoib packets

Ipoib netdev will share receive contexts with existing VNIC netdev.
To achieve that, a dummy netdev is allocated with hfi1_devdata to
own the receive contexts, and ipoib and VNIC netdevs will be put
on top of it. Each receive context is associated with a single
NAPI object.

This patch adds the functions to receive incoming packets for
accelerated ipoib.

Link: https://lore.kernel.org/r/20200511160631.173205.54184.stgit@awfm-01.aw.intel.com
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Sadanand Warrier <sadanand.warrier@intel.com>
Signed-off-by: Grzegorz Andrejczuk <grzegorz.andrejczuk@intel.com>
Signed-off-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

1 files changed, 79 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/hfi1/netdev_rx.c b/drivers/infiniband/hw/hfi1/netdev_rx.c
new file mode 100644
index 000000000000..3e286cbaa8c6
--- /dev/null
+++ b/drivers/infiniband/hw/hfi1/netdev_rx.c
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
+/*
+ * Copyright(c) 2020 Intel Corporation.
+ *
+ */
+
+/*
+ * This file contains HFI1 support for netdev RX functionality
+ */
+
+#include "sdma.h"
+#include "verbs.h"
+#include "netdev.h"
+#include "hfi.h"
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <rdma/ib_verbs.h>
+
+/**
+ * hfi1_netdev_add_data - Registers data with unique identifier
+ * to be requested later this is needed for VNIC and IPoIB VLANs
+ * implementations.
+ * This call is protected by mutex idr_lock.
+ *
+ * @dd: hfi1 dev data
+ * @id: requested integer id up to INT_MAX
+ * @data: data to be associated with index
+ */
+int hfi1_netdev_add_data(struct hfi1_devdata *dd, int id, void *data)
+{
+	struct hfi1_netdev_priv *priv = hfi1_netdev_priv(dd->dummy_netdev);
+
+	return xa_insert(&priv->dev_tbl, id, data, GFP_NOWAIT);
+}
+
+/**
+ * hfi1_netdev_remove_data - Removes data with previously given id.
+ * Returns the reference to removed entry.
+ *
+ * @dd: hfi1 dev data
+ * @id: requested integer id up to INT_MAX
+ */
+void *hfi1_netdev_remove_data(struct hfi1_devdata *dd, int id)
+{
+	struct hfi1_netdev_priv *priv = hfi1_netdev_priv(dd->dummy_netdev);
+
+	return xa_erase(&priv->dev_tbl, id);
+}
+
+/**
+ * hfi1_netdev_get_data - Gets data with given id
+ *
+ * @dd: hfi1 dev data
+ * @id: requested integer id up to INT_MAX
+ */
+void *hfi1_netdev_get_data(struct hfi1_devdata *dd, int id)
+{
+	struct hfi1_netdev_priv *priv = hfi1_netdev_priv(dd->dummy_netdev);
+
+	return xa_load(&priv->dev_tbl, id);
+}
+
+/**
+ * hfi1_netdev_get_first_dat - Gets first entry with greater or equal id.
+ *
+ * @dd: hfi1 dev data
+ * @id: requested integer id up to INT_MAX
+ */
+void *hfi1_netdev_get_first_data(struct hfi1_devdata *dd, int *start_id)
+{
+	struct hfi1_netdev_priv *priv = hfi1_netdev_priv(dd->dummy_netdev);
+	unsigned long index = *start_id;
+	void *ret;
+
+	ret = xa_find(&priv->dev_tbl, &index, UINT_MAX, XA_PRESENT);
+	*start_id = (int)index;
+	return ret;
+}