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Date: Wed, 13 Sep 2023 09:12:40 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: netdev@...r.kernel.org
Cc: kuba@...nel.org,
pabeni@...hat.com,
davem@...emloft.net,
edumazet@...gle.com,
idosch@...dia.com,
petrm@...dia.com,
jacob.e.keller@...el.com,
moshe@...dia.com,
shayd@...dia.com,
saeedm@...dia.com,
horms@...nel.org
Subject: [patch net-next v2 09/12] net/mlx5: SF, Implement peer devlink set for SF representor devlink port
From: Jiri Pirko <jiri@...dia.com>
Benefit from the existence of internal mlx5 notifier and extend it by
event MLX5_DRIVER_EVENT_SF_PEER_DEVLINK. Use this event from SF
auxiliary device probe/remove functions to pass the registered SF
devlink instance to the SF representor.
Process the new event in SF representor code and call
devl_port_fn_devlink_set() to do the assignments. Implement this in work
to avoid possible deadlock when probe/remove function of SF may be
called with devlink instance lock held during devlink reload.
Signed-off-by: Jiri Pirko <jiri@...dia.com>
---
v1->v2:
- rebased on top of net-next
- removed work code as devl_port_fn_devlink_set() could be called
without instance lock
- propagate return code newly returned by devl_port_fn_devlink_set()
---
.../ethernet/mellanox/mlx5/core/sf/dev/dev.h | 6 ++++
.../mellanox/mlx5/core/sf/dev/driver.c | 26 ++++++++++++++
.../ethernet/mellanox/mlx5/core/sf/devlink.c | 34 +++++++++++++++++++
include/linux/mlx5/device.h | 1 +
4 files changed, 67 insertions(+)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/dev.h b/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/dev.h
index 2a66a427ef15..b99131e95e37 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/dev.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/dev.h
@@ -19,6 +19,12 @@ struct mlx5_sf_dev {
u16 fn_id;
};
+struct mlx5_sf_peer_devlink_event_ctx {
+ u16 fn_id;
+ struct devlink *devlink;
+ int err;
+};
+
void mlx5_sf_dev_table_create(struct mlx5_core_dev *dev);
void mlx5_sf_dev_table_destroy(struct mlx5_core_dev *dev);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/driver.c b/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/driver.c
index 8fe82f1191bb..169c2c68ed5c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/driver.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/driver.c
@@ -8,6 +8,20 @@
#include "dev.h"
#include "devlink.h"
+static int mlx5_core_peer_devlink_set(struct mlx5_sf_dev *sf_dev, struct devlink *devlink)
+{
+ struct mlx5_sf_peer_devlink_event_ctx event_ctx = {
+ .fn_id = sf_dev->fn_id,
+ .devlink = devlink,
+ };
+ int ret;
+
+ ret = mlx5_blocking_notifier_call_chain(sf_dev->parent_mdev,
+ MLX5_DRIVER_EVENT_SF_PEER_DEVLINK,
+ &event_ctx);
+ return ret == NOTIFY_OK ? event_ctx.err : 0;
+}
+
static int mlx5_sf_dev_probe(struct auxiliary_device *adev, const struct auxiliary_device_id *id)
{
struct mlx5_sf_dev *sf_dev = container_of(adev, struct mlx5_sf_dev, adev);
@@ -54,9 +68,21 @@ static int mlx5_sf_dev_probe(struct auxiliary_device *adev, const struct auxilia
mlx5_core_warn(mdev, "mlx5_init_one err=%d\n", err);
goto init_one_err;
}
+
+ err = mlx5_core_peer_devlink_set(sf_dev, devlink);
+ if (err) {
+ mlx5_core_warn(mdev, "mlx5_core_peer_devlink_set err=%d\n", err);
+ goto peer_devlink_set_err;
+ }
+
devlink_register(devlink);
return 0;
+peer_devlink_set_err:
+ if (mlx5_dev_is_lightweight(sf_dev->mdev))
+ mlx5_uninit_one_light(sf_dev->mdev);
+ else
+ mlx5_uninit_one(sf_dev->mdev);
init_one_err:
iounmap(mdev->iseg);
remap_err:
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/sf/devlink.c b/drivers/net/ethernet/mellanox/mlx5/core/sf/devlink.c
index e34a8f88c518..964a5b1876f3 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/sf/devlink.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/sf/devlink.c
@@ -28,6 +28,7 @@ struct mlx5_sf_table {
struct mutex sf_state_lock; /* Serializes sf state among user cmds & vhca event handler. */
struct notifier_block esw_nb;
struct notifier_block vhca_nb;
+ struct notifier_block mdev_nb;
};
static struct mlx5_sf *
@@ -511,6 +512,35 @@ static int mlx5_sf_esw_event(struct notifier_block *nb, unsigned long event, voi
return 0;
}
+static int mlx5_sf_mdev_event(struct notifier_block *nb, unsigned long event, void *data)
+{
+ struct mlx5_sf_table *table = container_of(nb, struct mlx5_sf_table, mdev_nb);
+ struct mlx5_sf_peer_devlink_event_ctx *event_ctx = data;
+ int ret = NOTIFY_DONE;
+ struct mlx5_sf *sf;
+
+ if (event != MLX5_DRIVER_EVENT_SF_PEER_DEVLINK)
+ return NOTIFY_DONE;
+
+ table = mlx5_sf_table_try_get(table->dev);
+ if (!table)
+ return NOTIFY_DONE;
+
+ mutex_lock(&table->sf_state_lock);
+ sf = mlx5_sf_lookup_by_function_id(table, event_ctx->fn_id);
+ if (!sf)
+ goto out;
+
+ event_ctx->err = devl_port_fn_devlink_set(&sf->dl_port.dl_port,
+ event_ctx->devlink);
+
+ ret = NOTIFY_OK;
+out:
+ mutex_unlock(&table->sf_state_lock);
+ mlx5_sf_table_put(table);
+ return ret;
+}
+
static bool mlx5_sf_table_supported(const struct mlx5_core_dev *dev)
{
return dev->priv.eswitch && MLX5_ESWITCH_MANAGER(dev) &&
@@ -544,6 +574,9 @@ int mlx5_sf_table_init(struct mlx5_core_dev *dev)
if (err)
goto vhca_err;
+ table->mdev_nb.notifier_call = mlx5_sf_mdev_event;
+ mlx5_blocking_notifier_register(dev, &table->mdev_nb);
+
return 0;
vhca_err:
@@ -562,6 +595,7 @@ void mlx5_sf_table_cleanup(struct mlx5_core_dev *dev)
if (!table)
return;
+ mlx5_blocking_notifier_unregister(dev, &table->mdev_nb);
mlx5_vhca_event_notifier_unregister(table->dev, &table->vhca_nb);
mlx5_esw_event_notifier_unregister(dev->priv.eswitch, &table->esw_nb);
WARN_ON(refcount_read(&table->refcount));
diff --git a/include/linux/mlx5/device.h b/include/linux/mlx5/device.h
index 4d5be378fa8c..8fbe22de16ef 100644
--- a/include/linux/mlx5/device.h
+++ b/include/linux/mlx5/device.h
@@ -366,6 +366,7 @@ enum mlx5_driver_event {
MLX5_DRIVER_EVENT_UPLINK_NETDEV,
MLX5_DRIVER_EVENT_MACSEC_SA_ADDED,
MLX5_DRIVER_EVENT_MACSEC_SA_DELETED,
+ MLX5_DRIVER_EVENT_SF_PEER_DEVLINK,
};
enum {
--
2.41.0
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