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mlxsw: spectrum_router: Avoid potential packets loss

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am: 8f4db60c7f

Change-Id: I8f963c33b6f672e06fa25e49efe80df9ffa9eb2e
This commit is contained in:
Ido Schimmel
2017-03-22 11:57:21 +00:00
committed by android-build-merger
parent acd63a918d 8f4db60c7f
commit 965f701bbc
1 changed files with 20 additions and 10 deletions
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30
drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
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@@ -500,30 +500,40 @@ static int
mlxsw_sp_vr_lpm_tree_check(struct mlxsw_sp *mlxsw_sp, struct mlxsw_sp_vr *vr,
struct mlxsw_sp_prefix_usage *req_prefix_usage)
{
struct mlxsw_sp_lpm_tree *lpm_tree;
struct mlxsw_sp_lpm_tree *lpm_tree = vr->lpm_tree;
struct mlxsw_sp_lpm_tree *new_tree;
int err;
if (mlxsw_sp_prefix_usage_eq(req_prefix_usage,
&vr->lpm_tree->prefix_usage))
if (mlxsw_sp_prefix_usage_eq(req_prefix_usage, &lpm_tree->prefix_usage))
return 0;
lpm_tree = mlxsw_sp_lpm_tree_get(mlxsw_sp, req_prefix_usage,
new_tree = mlxsw_sp_lpm_tree_get(mlxsw_sp, req_prefix_usage,
vr->proto, false);
if (IS_ERR(lpm_tree)) {
if (IS_ERR(new_tree)) {
/* We failed to get a tree according to the required
* prefix usage. However, the current tree might be still good
* for us if our requirement is subset of the prefixes used
* in the tree.
*/
if (mlxsw_sp_prefix_usage_subset(req_prefix_usage,
&vr->lpm_tree->prefix_usage))
&lpm_tree->prefix_usage))
return 0;
return PTR_ERR(lpm_tree);
return PTR_ERR(new_tree);
}
mlxsw_sp_vr_lpm_tree_unbind(mlxsw_sp, vr);
mlxsw_sp_lpm_tree_put(mlxsw_sp, vr->lpm_tree);
/* Prevent packet loss by overwriting existing binding */
vr->lpm_tree = new_tree;
err = mlxsw_sp_vr_lpm_tree_bind(mlxsw_sp, vr);
if (err)
goto err_tree_bind;
mlxsw_sp_lpm_tree_put(mlxsw_sp, lpm_tree);
return 0;
err_tree_bind:
vr->lpm_tree = lpm_tree;
return mlxsw_sp_vr_lpm_tree_bind(mlxsw_sp, vr);
mlxsw_sp_lpm_tree_put(mlxsw_sp, new_tree);
return err;
}
static struct mlxsw_sp_vr *mlxsw_sp_vr_get(struct mlxsw_sp *mlxsw_sp,