net/mlx4_core: Add helper function to translate B0 steering rules to DMFS

A pre-step for supporting guests that use B0 steering over a hypervisor
that runs in DMFS (device managed flow steering mode). Add helper function
which allows to translate L2 attachments / detachments provided in B0 mode
to DMFS rules.

Signed-off-by: Hadar Hen Zion <hadarh@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 33 insertions, 22 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx4/mcg.c b/drivers/net/ethernet/mellanox/mlx4/mcg.c
index 52685524708d..ffc78d2cb0cf 100644
--- a/drivers/net/ethernet/mellanox/mlx4/mcg.c
+++ b/drivers/net/ethernet/mellanox/mlx4/mcg.c
@@ -1125,28 +1125,11 @@ static int mlx4_QP_ATTACH(struct mlx4_dev *dev, struct mlx4_qp *qp,
         return err;
 }
 
-int mlx4_multicast_attach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
-                          u8 port, int block_mcast_loopback,
-                          enum mlx4_protocol prot, u64 *reg_id)
+int mlx4_trans_to_dmfs_attach(struct mlx4_dev *dev, struct mlx4_qp *qp,
+                              u8 gid[16], u8 port,
+                              int block_mcast_loopback,
+                              enum mlx4_protocol prot, u64 *reg_id)
 {
-
-        switch (dev->caps.steering_mode) {
-        case MLX4_STEERING_MODE_A0:
-                if (prot == MLX4_PROT_ETH)
-                        return 0;
-
-        case MLX4_STEERING_MODE_B0:
-                if (prot == MLX4_PROT_ETH)
-                        gid[7] |= (MLX4_MC_STEER << 1);
-
-                if (mlx4_is_mfunc(dev))
-                        return mlx4_QP_ATTACH(dev, qp, gid, 1,
-                                              block_mcast_loopback, prot);
-                return mlx4_qp_attach_common(dev, qp, gid,
-                                             block_mcast_loopback, prot,
-                                             MLX4_MC_STEER);
-
-        case MLX4_STEERING_MODE_DEVICE_MANAGED: {
                 struct mlx4_spec_list spec = { {NULL} };
                 __be64 mac_mask = cpu_to_be64(MLX4_MAC_MASK << 16);
 
@@ -1180,8 +1163,32 @@ int mlx4_multicast_attach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
                 list_add_tail(&spec.list, &rule.list);
 
                 return mlx4_flow_attach(dev, &rule, reg_id);
-        }
+}
 
+int mlx4_multicast_attach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
+                          u8 port, int block_mcast_loopback,
+                          enum mlx4_protocol prot, u64 *reg_id)
+{
+        switch (dev->caps.steering_mode) {
+        case MLX4_STEERING_MODE_A0:
+                if (prot == MLX4_PROT_ETH)
+                        return 0;
+
+        case MLX4_STEERING_MODE_B0:
+                if (prot == MLX4_PROT_ETH)
+                        gid[7] |= (MLX4_MC_STEER << 1);
+
+                if (mlx4_is_mfunc(dev))
+                        return mlx4_QP_ATTACH(dev, qp, gid, 1,
+                                              block_mcast_loopback, prot);
+                return mlx4_qp_attach_common(dev, qp, gid,
+                                             block_mcast_loopback, prot,
+                                             MLX4_MC_STEER);
+
+        case MLX4_STEERING_MODE_DEVICE_MANAGED:
+                return mlx4_trans_to_dmfs_attach(dev, qp, gid, port,
+                                                 block_mcast_loopback,
+                                                 prot, reg_id);
         default:
                 return -EINVAL;
         }
diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4.h b/drivers/net/ethernet/mellanox/mlx4/mlx4.h
index d738454116a0..252f4ba7f32c 100644
--- a/drivers/net/ethernet/mellanox/mlx4/mlx4.h
+++ b/drivers/net/ethernet/mellanox/mlx4/mlx4.h
@@ -1190,6 +1190,10 @@ int mlx4_qp_detach_common(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
 int mlx4_qp_attach_common(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
                           int block_mcast_loopback, enum mlx4_protocol prot,
                           enum mlx4_steer_type steer);
+int mlx4_trans_to_dmfs_attach(struct mlx4_dev *dev, struct mlx4_qp *qp,
+                              u8 gid[16], u8 port,
+                              int block_mcast_loopback,
+                              enum mlx4_protocol prot, u64 *reg_id);
 int mlx4_SET_MCAST_FLTR_wrapper(struct mlx4_dev *dev, int slave,
                                 struct mlx4_vhcr *vhcr,
                                 struct mlx4_cmd_mailbox *inbox,