6.6-stable review patch. If anyone has any objections, please let me know.
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From: Jacob Keller jacob.e.keller@intel.com
[ Upstream commit 82617b9a04649e83ee8731918aeadbb6e6d7cbc7 ]
The ice_vsi_add_vlan() function is used to add a VLAN filter for the target VSI. This function prepares a filter in the switch table for the given VSI. If it succeeds, the vsi->num_vlan counter is incremented.
It is not considered an error to add a VLAN which already exists in the switch table, so the function explicitly checks and ignores -EEXIST. The vsi->num_vlan counter is still incremented.
This seems incorrect, as it means we can double-count in the case where the same VLAN is added twice by the caller. The actual table will have one less filter than the count.
The ice_vsi_del_vlan() function similarly checks and handles the -ENOENT condition for when deleting a filter that doesn't exist. This flow only decrements the vsi->num_vlan if it actually deleted a filter.
The vsi->num_vlan counter is used only in a few places, primarily related to tracking the number of non-zero VLANs. If the vsi->num_vlans gets out of sync, then ice_vsi_num_non_zero_vlans() will incorrectly report more VLANs than are present, and ice_vsi_has_non_zero_vlans() could return true potentially in cases where there are only VLAN 0 filters left.
Fix this by only incrementing the vsi->num_vlan in the case where we actually added an entry, and not in the case where the entry already existed.
Fixes: a1ffafb0b4a4 ("ice: Support configuring the device to Double VLAN Mode") Signed-off-by: Jacob Keller jacob.e.keller@intel.com Tested-by: Pucha Himasekhar Reddy himasekharx.reddy.pucha@intel.com Reviewed-by: Simon Horman horms@kernel.org Link: https://lore.kernel.org/r/20240523-net-2024-05-23-intel-net-fixes-v1-2-17a92... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/intel/ice/ice_vsi_vlan_lib.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/intel/ice/ice_vsi_vlan_lib.c b/drivers/net/ethernet/intel/ice/ice_vsi_vlan_lib.c index 8307902115ff2..3ecab12baea33 100644 --- a/drivers/net/ethernet/intel/ice/ice_vsi_vlan_lib.c +++ b/drivers/net/ethernet/intel/ice/ice_vsi_vlan_lib.c @@ -45,14 +45,15 @@ int ice_vsi_add_vlan(struct ice_vsi *vsi, struct ice_vlan *vlan) return -EINVAL;
err = ice_fltr_add_vlan(vsi, vlan); - if (err && err != -EEXIST) { + if (!err) + vsi->num_vlan++; + else if (err == -EEXIST) + err = 0; + else dev_err(ice_pf_to_dev(vsi->back), "Failure Adding VLAN %d on VSI %i, status %d\n", vlan->vid, vsi->vsi_num, err); - return err; - }
- vsi->num_vlan++; - return 0; + return err; }
/**