net/mlx5: SD, keep netdev resources on same PF in switchdev mode

In SD switchdev mode, network device resources such as channels and
completion vectors must remain on the same PF rather than being
distributed across SD group members.

Modify mlx5_sd_ch_ix_get_dev_ix() to return 0 and
mlx5_sd_ch_ix_get_vec_ix() to return the channel index directly when
in switchdev mode, keeping resources local to the requesting PF.

Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20260531113954.395443-11-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c
index 8991db3a19cf343ec3c47dca72faeae487c706b1..ec606851feb86a3405073f4782cd2da3948c6906 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c
@@ -6,6 +6,7 @@
 #include "mlx5_core.h"
 #include "lib/mlx5.h"
 #include "fs_cmd.h"
+#include <linux/mlx5/eswitch.h>
 #include <linux/mlx5/vport.h>
 #include <linux/debugfs.h>
 
@@ -85,11 +86,17 @@ mlx5_sd_primary_get_peer(struct mlx5_core_dev *primary, int idx)
 
 int mlx5_sd_ch_ix_get_dev_ix(struct mlx5_core_dev *dev, int ch_ix)
 {
+       if (is_mdev_switchdev_mode(dev))
+               return 0;
+
        return ch_ix % mlx5_sd_get_host_buses(dev);
 }
 
 int mlx5_sd_ch_ix_get_vec_ix(struct mlx5_core_dev *dev, int ch_ix)
 {
+       if (is_mdev_switchdev_mode(dev))
+               return ch_ix;
+
        return ch_ix / mlx5_sd_get_host_buses(dev);
 }