[PATCH net-next 3/4] mlxsw: spectrum_acl: Remove failed_rollback dead end

[Ido Schimmel]

From: Jiri Pirko <j...@mellanox.com>

Currently if a rollback ends with error, the vregion is in a zombie
state until end of the existence. Instead of that, rather try to
continue where rollback ended later on (after rehash interval).

Signed-off-by: Jiri Pirko <j...@mellanox.com>
Signed-off-by: Ido Schimmel <ido...@mellanox.com>
---
 .../mellanox/mlxsw/spectrum_acl_tcam.c        | 20 +++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c 
b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c
index a2af385bcd63..2f0b61b87c99 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c
@@ -216,7 +216,6 @@ struct mlxsw_sp_acl_tcam_vregion {
                struct mlxsw_sp_acl_tcam_rehash_ctx ctx;
        } rehash;
        struct mlxsw_sp *mlxsw_sp;
-       bool failed_rollback; /* Indicates failed rollback during migration */
        unsigned int ref_count;
 };
 
@@ -1315,8 +1314,13 @@ mlxsw_sp_acl_tcam_vchunk_migrate_one(struct mlxsw_sp 
*mlxsw_sp,
                err = mlxsw_sp_acl_tcam_ventry_migrate(mlxsw_sp, ventry,
                                                       vchunk->chunk, credits);
                if (err) {
-                       if (ctx->this_is_rollback)
+                       if (ctx->this_is_rollback) {
+                               /* Save the ventry which we ended with and try
+                                * to continue later on.
+                                */
+                               ctx->start_ventry = ventry;
                                return err;
+                       }
                        /* Swap the chunk and chunk2 pointers so the follow-up
                         * rollback call will see the original chunk pointer
                         * in vchunk->chunk.
@@ -1395,10 +1399,10 @@ mlxsw_sp_acl_tcam_vregion_migrate(struct mlxsw_sp 
*mlxsw_sp,
                err2 = mlxsw_sp_acl_tcam_vchunk_migrate_all(mlxsw_sp, vregion,
                                                            ctx, credits);
                if (err2) {
-                       vregion->failed_rollback = true;
                        trace_mlxsw_sp_acl_tcam_vregion_rehash_dis(mlxsw_sp,
                                                                   vregion);
                        dev_err(mlxsw_sp->bus_info->dev, "Failed to rollback 
during vregion migration fail\n");
+                       /* Let the rollback to be continued later on. */
                }
        }
        mutex_unlock(&vregion->lock);
@@ -1424,8 +1428,6 @@ mlxsw_sp_acl_tcam_vregion_rehash_start(struct mlxsw_sp 
*mlxsw_sp,
        int err;
 
        trace_mlxsw_sp_acl_tcam_vregion_rehash(mlxsw_sp, vregion);
-       if (vregion->failed_rollback)
-               return -EBUSY;
 
        hints_priv = ops->region_rehash_hints_get(vregion->region->priv);
        if (IS_ERR(hints_priv))
@@ -1472,11 +1474,9 @@ mlxsw_sp_acl_tcam_vregion_rehash_end(struct mlxsw_sp 
*mlxsw_sp,
        struct mlxsw_sp_acl_tcam_region *unused_region = vregion->region2;
        const struct mlxsw_sp_acl_tcam_ops *ops = mlxsw_sp->acl_tcam_ops;
 
-       if (!vregion->failed_rollback) {
-               vregion->region2 = NULL;
-               mlxsw_sp_acl_tcam_group_region_detach(mlxsw_sp, unused_region);
-               mlxsw_sp_acl_tcam_region_destroy(mlxsw_sp, unused_region);
-       }
+       vregion->region2 = NULL;
+       mlxsw_sp_acl_tcam_group_region_detach(mlxsw_sp, unused_region);
+       mlxsw_sp_acl_tcam_region_destroy(mlxsw_sp, unused_region);
        ops->region_rehash_hints_put(ctx->hints_priv);
        ctx->hints_priv = NULL;
 }
-- 
2.20.1