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Message-Id: <1551418672-12822-9-git-send-email-parav@mellanox.com>
Date: Thu, 28 Feb 2019 23:37:52 -0600
From: Parav Pandit <parav@...lanox.com>
To: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
michal.lkml@...kovi.net, davem@...emloft.net,
gregkh@...uxfoundation.org, jiri@...lanox.com
Cc: parav@...lanox.com
Subject: [RFC net-next 8/8] net/mlx5: Add subdev driver to bind to subdev devices
Add a subdev driver to probe the subdev devices and create fake
netdevice for it.
Signed-off-by: Parav Pandit <parav@...lanox.com>
---
drivers/net/ethernet/mellanox/mlx5/core/Makefile | 2 +-
drivers/net/ethernet/mellanox/mlx5/core/main.c | 8 +-
.../net/ethernet/mellanox/mlx5/core/mlx5_core.h | 3 +
.../ethernet/mellanox/mlx5/core/subdev_driver.c | 93 ++++++++++++++++++++++
4 files changed, 104 insertions(+), 2 deletions(-)
create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/subdev_driver.c
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/Makefile b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
index f218789..c8aeaf1 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/Makefile
+++ b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
@@ -16,7 +16,7 @@ mlx5_core-y := main.o cmd.o debugfs.o fw.o eq.o uar.o pagealloc.o \
transobj.o vport.o sriov.o fs_cmd.o fs_core.o \
fs_counters.o rl.o lag.o dev.o events.o wq.o lib/gid.o \
lib/devcom.o diag/fs_tracepoint.o diag/fw_tracer.o
-mlx5_core-$(CONFIG_SUBDEV) += subdev.o
+mlx5_core-$(CONFIG_SUBDEV) += subdev.o subdev_driver.o
#
# Netdev basic
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
index 5f8cf0d..7dfa8c4 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
@@ -1548,7 +1548,11 @@ static int __init init(void)
mlx5e_init();
#endif
- return 0;
+ err = subdev_register_driver(&mlx5_subdev_driver);
+ if (err)
+ pci_unregister_driver(&mlx5_core_driver);
+
+ return err;
err_debug:
mlx5_unregister_debugfs();
@@ -1557,6 +1561,8 @@ static int __init init(void)
static void __exit cleanup(void)
{
+ subdev_unregister_driver(&mlx5_subdev_driver);
+
#ifdef CONFIG_MLX5_CORE_EN
mlx5e_cleanup();
#endif
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
index 2a54148..1b733c7 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
@@ -41,12 +41,15 @@
#include <linux/ptp_clock_kernel.h>
#include <linux/mlx5/cq.h>
#include <linux/mlx5/fs.h>
+#include <linux/subdev_bus.h>
#define DRIVER_NAME "mlx5_core"
#define DRIVER_VERSION "5.0-0"
extern uint mlx5_core_debug_mask;
+extern struct subdev_driver mlx5_subdev_driver;
+
#define mlx5_core_dbg(__dev, format, ...) \
dev_dbg(&(__dev)->pdev->dev, "%s:%d:(pid %d): " format, \
__func__, __LINE__, current->pid, \
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/subdev_driver.c b/drivers/net/ethernet/mellanox/mlx5/core/subdev_driver.c
new file mode 100644
index 0000000..880aa4f
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/subdev_driver.c
@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2018-19 Mellanox Technologies
+
+#include <linux/module.h>
+#include <linux/dma-mapping.h>
+#include <linux/subdev_bus.h>
+#include <linux/subdev_ids.h>
+#include <linux/etherdevice.h>
+
+struct mlx5_subdev_ndev {
+ struct net_device ndev;
+};
+
+static void mlx5_dma_test(struct device *dev)
+{
+ dma_addr_t pa;
+ void *va;
+
+ va = dma_alloc_coherent(dev, 4096, &pa, GFP_KERNEL);
+ if (va)
+ dma_free_coherent(dev, 4096, va, pa);
+}
+
+static struct net_device *ndev;
+
+static int mlx5e_subdev_open(struct net_device *netdev)
+{
+ return 0;
+}
+
+static int mlx5e_subdev_close(struct net_device *netdev)
+{
+ return 0;
+}
+
+static netdev_tx_t
+mlx5e_subdev_xmit(struct sk_buff *skb, struct net_device *netdev)
+{
+ return NETDEV_TX_BUSY;
+}
+
+const struct net_device_ops mlx5e_subdev_netdev_ops = {
+ .ndo_open = mlx5e_subdev_open,
+ .ndo_stop = mlx5e_subdev_close,
+ .ndo_start_xmit = mlx5e_subdev_xmit,
+};
+
+static int mlx5_subdev_probe(struct device *dev)
+{
+ int err;
+
+ mlx5_dma_test(dev);
+ /* Only one device supported in rfc */
+ if (ndev)
+ return 0;
+
+ ndev = alloc_etherdev_mqs(sizeof(struct mlx5_subdev_ndev), 1, 1);
+ if (!ndev)
+ return -ENOMEM;
+
+ SET_NETDEV_DEV(ndev, dev);
+ ndev->netdev_ops = &mlx5e_subdev_netdev_ops;
+ err = register_netdev(ndev);
+ if (err) {
+ free_netdev(ndev);
+ ndev = NULL;
+ }
+ return err;
+}
+
+static int mlx5_subdev_remove(struct device *dev)
+{
+ if (ndev) {
+ unregister_netdev(ndev);
+ free_netdev(ndev);
+ ndev = NULL;
+ }
+ return 0;
+}
+
+static const struct subdev_id mlx5_subdev_id_table[] = {
+ { .vendor_id = SUBDEV_VENDOR_ID_MELLANOX,
+ .device_id = SUBDEV_DEVICE_ID_MELLANOX_SF },
+ { 0, }
+};
+MODULE_DEVICE_TABLE(subdev, mlx5_subdev_id_table);
+
+struct subdev_driver mlx5_subdev_driver = {
+ .id_table = mlx5_subdev_id_table,
+ .driver.name = "mlx5_subdev_driver",
+ .driver.probe = mlx5_subdev_probe,
+ .driver.remove = mlx5_subdev_remove,
+};
--
1.8.3.1
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