net/mlx5e: IPoIB, Add netdevice profile skeleton

Create mlx5e IPoIB netdevice profile skeleton in the new ipoib.c
file with empty implementation.

Downstream patches will provide the full mlx5 rdma netdevice acceleration
support for IPoIB into this new file, by using the mlx5e netdevice
profile and new mlx5_channels APIs and infrastructures.
Same as already done in mlx5e NIC netdevice and switchdev mode VF
representors.

Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Reviewed-by: Erez Shitrit <erezsh@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 181 insertions, 0 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/ipoib.c b/drivers/net/ethernet/mellanox/mlx5/core/ipoib.c
new file mode 100644
index 000000000000..2f65927a8d03
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/ipoib.c
@@ -0,0 +1,181 @@
+/*
+ * Copyright (c) 2017, Mellanox Technologies. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/mlx5/fs.h>
+#include "en.h"
+#include "ipoib.h"
+
+/* IPoIB mlx5 netdev profile */
+
+/* Called directly after IPoIB netdevice was created to initialize SW structs */
+static void mlx5i_init(struct mlx5_core_dev *mdev,
+		       struct net_device *netdev,
+		       const struct mlx5e_profile *profile,
+		       void *ppriv)
+{
+	struct mlx5e_priv *priv  = mlx5i_epriv(netdev);
+
+	priv->ppriv = ppriv;
+	/*  TODO: init netdev and mlx5e_params here */
+}
+
+/* Called directly before IPoIB netdevice is destroyed to cleanup SW structs */
+static void mlx5i_cleanup(struct mlx5e_priv *priv)
+{
+	/* Do nothing .. */
+}
+
+static int mlx5i_init_tx(struct mlx5e_priv *priv)
+{
+	/* TODO: Create IPoIB underlay QP */
+	/* TODO: create IPoIB TX HW TIS */
+	return 0;
+}
+
+static void mlx5i_cleanup_tx(struct mlx5e_priv *priv)
+{
+}
+
+static int mlx5i_init_rx(struct mlx5e_priv *priv)
+{
+	/* TODO: create IPoIB RX HW steering contexts */
+	return 0;
+}
+
+static void mlx5i_cleanup_rx(struct mlx5e_priv *priv)
+{
+}
+
+static const struct mlx5e_profile mlx5i_nic_profile = {
+	.init		   = mlx5i_init,
+	.cleanup	   = mlx5i_cleanup,
+	.init_tx	   = mlx5i_init_tx,
+	.cleanup_tx	   = mlx5i_cleanup_tx,
+	.init_rx	   = mlx5i_init_rx,
+	.cleanup_rx	   = mlx5i_cleanup_rx,
+	.enable		   = NULL, /* mlx5i_enable */
+	.disable	   = NULL, /* mlx5i_disable */
+	.update_stats	   = NULL, /* mlx5i_update_stats */
+	.max_nch	   = mlx5e_get_max_num_channels,
+	.max_tc		   = MLX5I_MAX_NUM_TC,
+};
+
+/* IPoIB RDMA netdev callbacks */
+
+static int mlx5i_check_required_hca_cap(struct mlx5_core_dev *mdev)
+{
+	if (MLX5_CAP_GEN(mdev, port_type) != MLX5_CAP_PORT_TYPE_IB)
+		return -EOPNOTSUPP;
+
+	if (!MLX5_CAP_GEN(mdev, ipoib_enhanced_offloads)) {
+		mlx5_core_warn(mdev, "IPoIB enhanced offloads are not supported\n");
+		return -ENOTSUPP;
+	}
+
+	return 0;
+}
+
+struct net_device *mlx5_rdma_netdev_alloc(struct mlx5_core_dev *mdev,
+					  struct ib_device *ibdev,
+					  const char *name,
+					  void (*setup)(struct net_device *))
+{
+	const struct mlx5e_profile *profile = &mlx5i_nic_profile;
+	int nch = profile->max_nch(mdev);
+	struct net_device *netdev;
+	struct mlx5i_priv *ipriv;
+	struct mlx5e_priv *epriv;
+	int err;
+
+	if (mlx5i_check_required_hca_cap(mdev)) {
+		mlx5_core_warn(mdev, "Accelerated mode is not supported\n");
+		return ERR_PTR(-EOPNOTSUPP);
+	}
+
+	/* This function should only be called once per mdev */
+	err = mlx5e_create_mdev_resources(mdev);
+	if (err)
+		return NULL;
+
+	netdev = alloc_netdev_mqs(sizeof(struct mlx5i_priv) + sizeof(struct mlx5e_priv),
+				  name, NET_NAME_UNKNOWN,
+				  setup,
+				  nch * MLX5E_MAX_NUM_TC,
+				  nch);
+	if (!netdev) {
+		mlx5_core_warn(mdev, "alloc_netdev_mqs failed\n");
+		goto free_mdev_resources;
+	}
+
+	ipriv = netdev_priv(netdev);
+	epriv = mlx5i_epriv(netdev);
+
+	epriv->wq = create_singlethread_workqueue("mlx5i");
+	if (!epriv->wq)
+		goto err_free_netdev;
+
+	profile->init(mdev, netdev, profile, ipriv);
+
+	mlx5e_attach_netdev(epriv);
+	netif_carrier_off(netdev);
+
+	/* TODO: set rdma_netdev func pointers
+	 * rn = &ipriv->rn;
+	 * rn->hca  = ibdev;
+	 * rn->send = mlx5i_xmit;
+	 * rn->attach_mcast = mlx5i_attach_mcast;
+	 * rn->detach_mcast = mlx5i_detach_mcast;
+	 */
+	return netdev;
+
+free_mdev_resources:
+	mlx5e_destroy_mdev_resources(mdev);
+err_free_netdev:
+	free_netdev(netdev);
+	return NULL;
+}
+EXPORT_SYMBOL(mlx5_rdma_netdev_alloc);
+
+void mlx5_rdma_netdev_free(struct net_device *netdev)
+{
+	struct mlx5e_priv          *priv    = mlx5i_epriv(netdev);
+	const struct mlx5e_profile *profile = priv->profile;
+
+	mlx5e_detach_netdev(priv);
+	profile->cleanup(priv);
+	destroy_workqueue(priv->wq);
+	free_netdev(netdev);
+
+	mlx5e_destroy_mdev_resources(priv->mdev);
+}
+EXPORT_SYMBOL(mlx5_rdma_netdev_free);
+