[PATCH mlx5-next 05/11] net/mlx5: Register mlx5 devices to auxiliary virtual bus
From: Leon Romanovsky
Date: Mon Oct 26 2020 - 07:20:12 EST
From: Leon Romanovsky <leonro@xxxxxxxxxx>
Create auxiliary devices under new virtual bus. This will replace
the custom-made mlx5 ->add()/->remove() interfaces and next patches
will fill the missing callback and remove the old interface logic.
The attachment of auxiliary drivers to the devices is possible in
1-to-1 manner only and it requires us to create device for every protocol,
so that device (module) will be able to connect to it.
System with 2 IB and 1 RoCE cards:
[leonro@vm ~]$ lspci |grep nox
00:09.0 Ethernet controller: Mellanox Technologies MT27800 Family [ConnectX-5]
00:0a.0 Ethernet controller: Mellanox Technologies MT28908 Family [ConnectX-6]
00:0b.0 Ethernet controller: Mellanox Technologies MT2910 Family [ConnectX-7]
[leonro@vm ~]$ ls -l /sys/bus/auxiliary/devices/
mlx5_core.eth.2 -> ../../../devices/pci0000:00/0000:00:0b.0/mlx5_core.eth.2
mlx5_core.rdma.0 -> ../../../devices/pci0000:00/0000:00:09.0/mlx5_core.rdma.0
mlx5_core.rdma.1 -> ../../../devices/pci0000:00/0000:00:0a.0/mlx5_core.rdma.1
mlx5_core.rdma.2 -> ../../../devices/pci0000:00/0000:00:0b.0/mlx5_core.rdma.2
[leonro@vm ~]$ rdma dev
0: ibp0s9: node_type ca fw 4.6.9999 node_guid 5254:00c0:fe12:3455 sys_image_guid 5254:00c0:fe12:3455
1: ibp0s10: node_type ca fw 4.6.9999 node_guid 5254:00c0:fe12:3456 sys_image_guid 5254:00c0:fe12:3456
2: rdmap0s11: node_type ca fw 4.6.9999 node_guid 5254:00c0:fe12:3457 sys_image_guid 5254:00c0:fe12:3457
System with RoCE SR-IOV card with 4 VFs:
[leonro@vm ~]$ lspci |grep nox
01:00.0 Ethernet controller: Mellanox Technologies MT28908 Family [ConnectX-6]
01:00.1 Ethernet controller: Mellanox Technologies MT28908 Family [ConnectX-6 Virtual Function]
01:00.2 Ethernet controller: Mellanox Technologies MT28908 Family [ConnectX-6 Virtual Function]
01:00.3 Ethernet controller: Mellanox Technologies MT28908 Family [ConnectX-6 Virtual Function]
01:00.4 Ethernet controller: Mellanox Technologies MT28908 Family [ConnectX-6 Virtual Function]
[leonro@vm ~]$ ls -l /sys/bus/auxiliary/devices/
mlx5_core.eth.0 -> ../../../devices/pci0000:00/0000:00:09.0/0000:01:00.0/mlx5_core.eth.0
mlx5_core.eth.1 -> ../../../devices/pci0000:00/0000:00:09.0/0000:01:00.1/mlx5_core.eth.1
mlx5_core.eth.2 -> ../../../devices/pci0000:00/0000:00:09.0/0000:01:00.2/mlx5_core.eth.2
mlx5_core.eth.3 -> ../../../devices/pci0000:00/0000:00:09.0/0000:01:00.3/mlx5_core.eth.3
mlx5_core.eth.4 -> ../../../devices/pci0000:00/0000:00:09.0/0000:01:00.4/mlx5_core.eth.4
mlx5_core.rdma.0 -> ../../../devices/pci0000:00/0000:00:09.0/0000:01:00.0/mlx5_core.rdma.0
mlx5_core.rdma.1 -> ../../../devices/pci0000:00/0000:00:09.0/0000:01:00.1/mlx5_core.rdma.1
mlx5_core.rdma.2 -> ../../../devices/pci0000:00/0000:00:09.0/0000:01:00.2/mlx5_core.rdma.2
mlx5_core.rdma.3 -> ../../../devices/pci0000:00/0000:00:09.0/0000:01:00.3/mlx5_core.rdma.3
mlx5_core.rdma.4 -> ../../../devices/pci0000:00/0000:00:09.0/0000:01:00.4/mlx5_core.rdma.4
[leonro@vm ~]$ rdma dev
0: rocep1s0f0: node_type ca fw 4.6.9999 node_guid 5254:00c0:fe12:3455 sys_image_guid 5254:00c0:fe12:3455
1: rocep1s0f0v0: node_type ca fw 4.6.9999 node_guid 0000:0000:0000:0000 sys_image_guid 5254:00c0:fe12:3456
2: rocep1s0f0v1: node_type ca fw 4.6.9999 node_guid 0000:0000:0000:0000 sys_image_guid 5254:00c0:fe12:3457
3: rocep1s0f0v2: node_type ca fw 4.6.9999 node_guid 0000:0000:0000:0000 sys_image_guid 5254:00c0:fe12:3458
4: rocep1s0f0v3: node_type ca fw 4.6.9999 node_guid 0000:0000:0000:0000 sys_image_guid 5254:00c0:fe12:3459
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxx>
---
.../net/ethernet/mellanox/mlx5/core/Kconfig | 1 +
drivers/net/ethernet/mellanox/mlx5/core/dev.c | 193 +++++++++++++++++-
.../net/ethernet/mellanox/mlx5/core/main.c | 13 +-
.../ethernet/mellanox/mlx5/core/mlx5_core.h | 13 +-
include/linux/mlx5/driver.h | 28 ++-
5 files changed, 239 insertions(+), 9 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/Kconfig b/drivers/net/ethernet/mellanox/mlx5/core/Kconfig
index 99f1ec3b2575..485478979b1a 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/Kconfig
+++ b/drivers/net/ethernet/mellanox/mlx5/core/Kconfig
@@ -6,6 +6,7 @@
config MLX5_CORE
tristate "Mellanox 5th generation network adapters (ConnectX series) core driver"
depends on PCI
+ select AUXILIARY_BUS
select NET_DEVLINK
depends on VXLAN || !VXLAN
depends on MLXFW || !MLXFW
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/dev.c b/drivers/net/ethernet/mellanox/mlx5/core/dev.c
index 1972ddd12704..d57b549a358c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/dev.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/dev.c
@@ -37,6 +37,7 @@ static LIST_HEAD(intf_list);
static LIST_HEAD(mlx5_dev_list);
/* intf dev list mutex */
static DEFINE_MUTEX(mlx5_intf_mutex);
+static DEFINE_IDA(mlx5_adev_ida);
struct mlx5_device_context {
struct list_head list;
@@ -50,6 +51,36 @@ enum {
MLX5_INTERFACE_ATTACHED,
};
+static const struct mlx5_adev_device {
+ const char *suffix;
+ bool (*is_supported)(struct mlx5_core_dev *dev);
+} mlx5_adev_devices[1] = {};
+
+int mlx5_adev_init(struct mlx5_core_dev *dev)
+{
+ struct mlx5_priv *priv = &dev->priv;
+
+ priv->adev = kcalloc(ARRAY_SIZE(mlx5_adev_devices),
+ sizeof(struct mlx5_adev *), GFP_KERNEL);
+ if (!priv->adev)
+ return -ENOMEM;
+
+ dev->priv.adev_idx = ida_alloc(&mlx5_adev_ida, GFP_KERNEL);
+ if (dev->priv.adev_idx < 0) {
+ kfree(priv->adev);
+ return dev->priv.adev_idx;
+ }
+
+ return 0;
+}
+
+void mlx5_adev_cleanup(struct mlx5_core_dev *dev)
+{
+ struct mlx5_priv *priv = &dev->priv;
+
+ ida_free(&mlx5_adev_ida, priv->adev_idx);
+ kfree(priv->adev);
+}
void mlx5_add_device(struct mlx5_interface *intf, struct mlx5_priv *priv)
{
@@ -193,16 +224,80 @@ bool mlx5_device_registered(struct mlx5_core_dev *dev)
return found;
}
-void mlx5_register_device(struct mlx5_core_dev *dev)
+static void adev_release(struct device *dev)
+{
+ struct mlx5_adev *mlx5_adev =
+ container_of(dev, struct mlx5_adev, adev.dev);
+ struct mlx5_priv *priv = &mlx5_adev->mdev->priv;
+ int idx = mlx5_adev->idx;
+
+ kfree(mlx5_adev);
+ priv->adev[idx] = NULL;
+}
+
+static struct mlx5_adev *add_adev(struct mlx5_core_dev *dev, int idx)
+{
+ const char *suffix = mlx5_adev_devices[idx].suffix;
+ struct auxiliary_device *adev;
+ struct mlx5_adev *madev;
+ int ret;
+
+ madev = kzalloc(sizeof(*madev), GFP_KERNEL);
+ if (!madev)
+ return ERR_PTR(-ENOMEM);
+
+ adev = &madev->adev;
+ adev->id = dev->priv.adev_idx;
+ adev->name = suffix;
+ adev->dev.parent = dev->device;
+ adev->dev.release = adev_release;
+ madev->mdev = dev;
+ madev->idx = idx;
+
+ ret = auxiliary_device_init(adev);
+ if (ret) {
+ kfree(madev);
+ return ERR_PTR(ret);
+ }
+
+ ret = auxiliary_device_add(adev);
+ if (ret) {
+ auxiliary_device_uninit(adev);
+ return ERR_PTR(ret);
+ }
+ return madev;
+}
+
+static void del_adev(struct auxiliary_device *adev)
+{
+ auxiliary_device_delete(adev);
+ auxiliary_device_uninit(adev);
+}
+
+int mlx5_register_device(struct mlx5_core_dev *dev)
{
struct mlx5_priv *priv = &dev->priv;
struct mlx5_interface *intf;
+ int ret;
+
+ mutex_lock(&mlx5_intf_mutex);
+ dev->priv.flags &= ~MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV;
+ ret = _mlx5_rescan_drivers(dev);
+ mutex_unlock(&mlx5_intf_mutex);
+ if (ret)
+ goto add_err;
mutex_lock(&mlx5_intf_mutex);
list_add_tail(&priv->dev_list, &mlx5_dev_list);
list_for_each_entry(intf, &intf_list, list)
mlx5_add_device(intf, priv);
mutex_unlock(&mlx5_intf_mutex);
+
+ return 0;
+
+add_err:
+ mlx5_unregister_device(dev);
+ return ret;
}
void mlx5_unregister_device(struct mlx5_core_dev *dev)
@@ -214,6 +309,9 @@ void mlx5_unregister_device(struct mlx5_core_dev *dev)
list_for_each_entry_reverse(intf, &intf_list, list)
mlx5_remove_device(intf, priv);
list_del(&priv->dev_list);
+
+ dev->priv.flags |= MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV;
+ _mlx5_rescan_drivers(dev);
mutex_unlock(&mlx5_intf_mutex);
}
@@ -246,6 +344,63 @@ void mlx5_unregister_interface(struct mlx5_interface *intf)
}
EXPORT_SYMBOL(mlx5_unregister_interface);
+/* This function is used after mlx5_core_dev is reconfigured.
+ */
+int _mlx5_rescan_drivers(struct mlx5_core_dev *dev)
+{
+ struct mlx5_priv *priv = &dev->priv;
+ bool delete_all;
+ int i, ret = 0;
+
+ lockdep_assert_held(&mlx5_intf_mutex);
+
+ delete_all = priv->flags & MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV;
+
+ for (i = ARRAY_SIZE(mlx5_adev_devices) - 1; i >= 0; i--) {
+ bool is_supported = false;
+
+ if (!priv->adev[i])
+ continue;
+
+ if (mlx5_adev_devices[i].is_supported && !delete_all)
+ is_supported = mlx5_adev_devices[i].is_supported(dev);
+
+ if (is_supported)
+ continue;
+
+ del_adev(&priv->adev[i]->adev);
+ priv->adev[i] = NULL;
+ }
+
+ if (delete_all)
+ return ret;
+
+ for (i = 0; i < ARRAY_SIZE(mlx5_adev_devices); i++) {
+ bool is_supported = false;
+
+ if (priv->adev[i])
+ continue;
+
+ if (mlx5_adev_devices[i].is_supported)
+ is_supported = mlx5_adev_devices[i].is_supported(dev);
+
+ if (!is_supported)
+ continue;
+
+ priv->adev[i] = add_adev(dev, i);
+ if (IS_ERR(priv->adev[i])) {
+ mlx5_core_warn(dev, "Device[%d] (%s) failed to load\n",
+ i, mlx5_adev_devices[i].suffix);
+ /* We continue to rescan drivers and leave to the caller
+ * to make decision if to release everything or continue.
+ */
+ ret = PTR_ERR(priv->adev[i]);
+ priv->adev[i] = NULL;
+ }
+ }
+ return ret;
+}
+
/* Must be called with intf_mutex held */
static bool mlx5_has_added_dev_by_protocol(struct mlx5_core_dev *mdev, int protocol)
{
@@ -299,24 +454,55 @@ void mlx5_remove_dev_by_protocol(struct mlx5_core_dev *dev, int protocol)
}
}
-static u32 mlx5_gen_pci_id(struct mlx5_core_dev *dev)
+static u32 mlx5_gen_pci_id(const struct mlx5_core_dev *dev)
{
return (u32)((pci_domain_nr(dev->pdev->bus) << 16) |
(dev->pdev->bus->number << 8) |
PCI_SLOT(dev->pdev->devfn));
}
-/* Must be called with intf_mutex held */
+static int next_phys_dev(struct device *dev, const void *data)
+{
+ struct mlx5_adev *madev = container_of(dev, struct mlx5_adev, adev.dev);
+ struct mlx5_core_dev *mdev = madev->mdev;
+ const struct mlx5_core_dev *curr = data;
+
+ if (!mlx5_core_is_pf(mdev))
+ return 0;
+
+ if (mdev == curr)
+ return 0;
+
+ if (mlx5_gen_pci_id(mdev) != mlx5_gen_pci_id(curr))
+ return 0;
+
+ return 1;
+}
+
+/* This function is called with two flows:
+ * 1. During initialization of mlx5_core_dev and we don't need to lock it.
+ * 2. During LAG configure stage and caller holds &mlx5_intf_mutex.
+ */
struct mlx5_core_dev *mlx5_get_next_phys_dev(struct mlx5_core_dev *dev)
{
struct mlx5_core_dev *res = NULL;
struct mlx5_core_dev *tmp_dev;
+ struct auxiliary_device *adev;
+ struct mlx5_adev *madev;
struct mlx5_priv *priv;
u32 pci_id;
if (!mlx5_core_is_pf(dev))
return NULL;
+ adev = auxiliary_find_device(NULL, dev, &next_phys_dev);
+ if (adev) {
+ madev = container_of(adev, struct mlx5_adev, adev);
+
+ put_device(&adev->dev);
+ return madev->mdev;
+ }
+
pci_id = mlx5_gen_pci_id(dev);
list_for_each_entry(priv, &mlx5_dev_list, dev_list) {
tmp_dev = container_of(priv, struct mlx5_core_dev, priv);
@@ -332,7 +518,6 @@ struct mlx5_core_dev *mlx5_get_next_phys_dev(struct mlx5_core_dev *dev)
return res;
}
-
void mlx5_dev_list_lock(void)
{
mutex_lock(&mlx5_intf_mutex);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
index 9827127cb674..b56a3c956283 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
@@ -1222,7 +1222,9 @@ int mlx5_load_one(struct mlx5_core_dev *dev, bool boot)
err = mlx5_devlink_register(priv_to_devlink(dev), dev->device);
if (err)
goto err_devlink_reg;
- mlx5_register_device(dev);
+ err = mlx5_register_device(dev);
+ if (err)
+ goto err_register;
} else {
mlx5_attach_device(dev);
}
@@ -1230,6 +1232,8 @@ int mlx5_load_one(struct mlx5_core_dev *dev, bool boot)
mutex_unlock(&dev->intf_state_mutex);
return 0;
+err_register:
+ mlx5_devlink_unregister(priv_to_devlink(dev));
err_devlink_reg:
clear_bit(MLX5_INTERFACE_STATE_UP, &dev->intf_state);
mlx5_unload(dev);
@@ -1306,8 +1310,14 @@ static int mlx5_mdev_init(struct mlx5_core_dev *dev, int profile_idx)
if (err)
goto err_pagealloc_init;
+ err = mlx5_adev_init(dev);
+ if (err)
+ goto err_adev_init;
+
return 0;
+err_adev_init:
+ mlx5_pagealloc_cleanup(dev);
err_pagealloc_init:
mlx5_health_cleanup(dev);
err_health_init:
@@ -1324,6 +1334,7 @@ static void mlx5_mdev_uninit(struct mlx5_core_dev *dev)
{
struct mlx5_priv *priv = &dev->priv;
+ mlx5_adev_cleanup(dev);
mlx5_pagealloc_cleanup(dev);
mlx5_health_cleanup(dev);
debugfs_remove_recursive(dev->priv.dbg_root);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
index b285f1515e4e..3bb7e5606d75 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
@@ -183,7 +183,7 @@ void mlx5_remove_device(struct mlx5_interface *intf, struct mlx5_priv *priv);
void mlx5_attach_device(struct mlx5_core_dev *dev);
void mlx5_detach_device(struct mlx5_core_dev *dev);
bool mlx5_device_registered(struct mlx5_core_dev *dev);
-void mlx5_register_device(struct mlx5_core_dev *dev);
+int mlx5_register_device(struct mlx5_core_dev *dev);
void mlx5_unregister_device(struct mlx5_core_dev *dev);
void mlx5_add_dev_by_protocol(struct mlx5_core_dev *dev, int protocol);
void mlx5_remove_dev_by_protocol(struct mlx5_core_dev *dev, int protocol);
@@ -232,6 +232,17 @@ static inline int mlx5_lag_is_lacp_owner(struct mlx5_core_dev *dev)
MLX5_CAP_GEN(dev, lag_master);
}
+int _mlx5_rescan_drivers(struct mlx5_core_dev *dev);
+static inline int mlx5_rescan_drivers(struct mlx5_core_dev *dev)
+{
+ int ret;
+
+ mlx5_dev_list_lock();
+ ret = _mlx5_rescan_drivers(dev);
+ mlx5_dev_list_unlock();
+ return ret;
+}
+
void mlx5_reload_interface(struct mlx5_core_dev *mdev, int protocol);
void mlx5_lag_update(struct mlx5_core_dev *dev);
diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h
index ed1d030658d2..b113023d242e 100644
--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -48,6 +48,7 @@
#include <linux/idr.h>
#include <linux/notifier.h>
#include <linux/refcount.h>
+#include <linux/auxiliary_bus.h>
#include <linux/mlx5/device.h>
#include <linux/mlx5/doorbell.h>
@@ -536,6 +537,17 @@ struct mlx5_core_roce {
struct mlx5_flow_handle *allow_rule;
};
+enum {
+ MLX5_PRIV_FLAGS_DISABLE_IB_ADEV = 1 << 0,
+ MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV = 1 << 1,
+};
+
+struct mlx5_adev {
+ struct auxiliary_device adev;
+ struct mlx5_core_dev *mdev;
+ int idx;
+};
+
struct mlx5_priv {
/* IRQ table valid only for real pci devices PF or VF */
struct mlx5_irq_table *irq_table;
@@ -573,6 +585,8 @@ struct mlx5_priv {
struct list_head dev_list;
struct list_head ctx_list;
spinlock_t ctx_lock;
+ struct mlx5_adev **adev;
+ int adev_idx;
struct mlx5_events *events;
struct mlx5_flow_steering *steering;
@@ -580,6 +594,7 @@ struct mlx5_priv {
struct mlx5_eswitch *eswitch;
struct mlx5_core_sriov sriov;
struct mlx5_lag *lag;
+ u32 flags;
struct mlx5_devcom *devcom;
struct mlx5_fw_reset *fw_reset;
struct mlx5_core_roce roce;
@@ -947,6 +962,8 @@ int mlx5_cmd_free_uar(struct mlx5_core_dev *dev, u32 uarn);
void mlx5_health_flush(struct mlx5_core_dev *dev);
void mlx5_health_cleanup(struct mlx5_core_dev *dev);
int mlx5_health_init(struct mlx5_core_dev *dev);
+void mlx5_adev_cleanup(struct mlx5_core_dev *dev);
+int mlx5_adev_init(struct mlx5_core_dev *dev);
void mlx5_start_health_poll(struct mlx5_core_dev *dev);
void mlx5_stop_health_poll(struct mlx5_core_dev *dev, bool disable_health);
void mlx5_drain_health_wq(struct mlx5_core_dev *dev);
@@ -1063,9 +1080,14 @@ enum {
};
enum {
- MLX5_INTERFACE_PROTOCOL_IB = 0,
- MLX5_INTERFACE_PROTOCOL_ETH = 1,
- MLX5_INTERFACE_PROTOCOL_VDPA = 2,
+ MLX5_INTERFACE_PROTOCOL_ETH_REP,
+ MLX5_INTERFACE_PROTOCOL_ETH,
+
+ MLX5_INTERFACE_PROTOCOL_IB_REP,
+ MLX5_INTERFACE_PROTOCOL_MPIB,
+ MLX5_INTERFACE_PROTOCOL_IB,
+
+ MLX5_INTERFACE_PROTOCOL_VDPA,
};
struct mlx5_interface {
--
2.26.2