[PATCH v3 08/10] mlx5: Create an auxiliary device for fwctl_mlx5

Jason Gunthorpe
2024-08-21T18:11:14Z

From: Saeed Mahameed <saeedm@nvidia.com>

If the device supports User Context then it can support fwctl. Create an
auxiliary device to allow fwctl to bind to it.

Create a sysfs like:

$ ls /sys/devices/pci0000:00/0000:00:0a.0/mlx5_core.fwctl.0/driver -l
lrwxrwxrwx 1 root root 0 Apr 25 19:46 /sys/devices/pci0000:00/0000:00:0a.0/mlx5_core.fwctl.0/driver -> ../../../../bus/auxiliary/drivers/mlx5_fwctl.mlx5_fwctl

Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
drivers/net/ethernet/mellanox/mlx5/core/dev.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/dev.c b/drivers/net/ethernet/mellanox/mlx5/core/dev.c
index 9a79674d27f15a..0786b011a8bc29 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/dev.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/dev.c
@@ -228,8 +228,14 @@ enum {
MLX5_INTERFACE_PROTOCOL_VNET,

MLX5_INTERFACE_PROTOCOL_DPLL,
+ MLX5_INTERFACE_PROTOCOL_FWCTL,
};

+static bool is_fwctl_supported(struct mlx5_core_dev *dev)
+{
+ return MLX5_CAP_GEN(dev, uctx_cap);
+}
+
static const struct mlx5_adev_device {
const char *suffix;
bool (*is_supported)(struct mlx5_core_dev *dev);
@@ -252,6 +258,8 @@ static const struct mlx5_adev_device {
.is_supported = &is_mp_supported },
[MLX5_INTERFACE_PROTOCOL_DPLL] = { .suffix = "dpll",
.is_supported = &is_dpll_supported },
+ [MLX5_INTERFACE_PROTOCOL_FWCTL] = { .suffix = "fwctl",
+ .is_supported = &is_fwctl_supported },
};

int mlx5_adev_idx_alloc(void)
--
2.46.0