From 12746fd21e9fe1bf9103a28f15abbf343a3a66d0 Mon Sep 17 00:00:00 2001 From: Amritha Nambiar Date: Mon, 16 May 2016 18:33:20 -0700 Subject: [PATCH] ixgbe: Error handler for duplicate filter locations in hardware for cls_u32 offloads For u32 classifier filters, avoid overwriting existing filter in a hardware location without removing it first, to clean up inconsistencies due to duplicate values for filter location. Verified with the following filters: Create child hash tables: handle 1: u32 divisor 1 handle 2: u32 divisor 1 Link to the child hash table from parent hash table: handle 800:0:11 u32 ht 800: link 1: \ offset at 0 mask 0f00 shift 6 plus 0 eat \ match ip protocol 6 ff match ip dst 15.0.0.1/32 handle 800:0:12 u32 ht 800: link 2: \ offset at 0 mask 0f00 shift 6 plus 0 eat \ match ip protocol 17 ff match ip dst 16.0.0.1/32 Add filter into child hash table: handle 1:0:3 u32 ht 1: \ match tcp src 22 ffff action drop Add another filter to the same location: handle 2:0:3 u32 ht 2: \ match tcp src 33 ffff action drop Signed-off-by: Amritha Nambiar Tested-by: Andrew Bowers Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 41 +++++++++++-------- 1 file changed, 25 insertions(+), 16 deletions(-) diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c index 75e6855e2c13..fd5a761c68f3 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c @@ -8315,8 +8315,11 @@ static int ixgbe_delete_clsu32(struct ixgbe_adapter *adapter, /* Clear this filter in the link data it is associated with */ if (uhtid != 0x800) { jump = adapter->jump_tables[uhtid]; - if (jump) - clear_bit(loc - 1, jump->child_loc_map); + if (!jump) + return -EINVAL; + if (!test_bit(loc - 1, jump->child_loc_map)) + return -EINVAL; + clear_bit(loc - 1, jump->child_loc_map); } /* Check if the filter being deleted is a link */ @@ -8606,7 +8609,7 @@ static int ixgbe_configure_clsu32(struct ixgbe_adapter *adapter, mask = kzalloc(sizeof(*mask), GFP_KERNEL); if (!mask) { err = -ENOMEM; - goto err_out; + goto free_input; } jump->input = input; jump->mask = mask; @@ -8629,7 +8632,7 @@ static int ixgbe_configure_clsu32(struct ixgbe_adapter *adapter, mask = kzalloc(sizeof(*mask), GFP_KERNEL); if (!mask) { err = -ENOMEM; - goto err_out; + goto free_input; } if ((uhtid != 0x800) && (adapter->jump_tables[uhtid])) { @@ -8639,6 +8642,20 @@ static int ixgbe_configure_clsu32(struct ixgbe_adapter *adapter, if ((adapter->jump_tables[uhtid])->mask) memcpy(mask, (adapter->jump_tables[uhtid])->mask, sizeof(*mask)); + + /* Lookup in all child hash tables if this location is already + * filled with a filter + */ + for (i = 1; i < IXGBE_MAX_LINK_HANDLE; i++) { + struct ixgbe_jump_table *link = adapter->jump_tables[i]; + + if (link && (test_bit(loc - 1, link->child_loc_map))) { + e_err(drv, "Filter exists in location: %x\n", + loc); + err = -EINVAL; + goto err_out; + } + } } err = ixgbe_clsu32_build_input(input, mask, cls, field_ptr, NULL); if (err) @@ -8670,25 +8687,17 @@ static int ixgbe_configure_clsu32(struct ixgbe_adapter *adapter, ixgbe_update_ethtool_fdir_entry(adapter, input, input->sw_idx); spin_unlock(&adapter->fdir_perfect_lock); - if ((uhtid != 0x800) && (adapter->jump_tables[uhtid])) { - struct ixgbe_jump_table *link = adapter->jump_tables[uhtid]; + if ((uhtid != 0x800) && (adapter->jump_tables[uhtid])) + set_bit(loc - 1, (adapter->jump_tables[uhtid])->child_loc_map); - if (test_bit(loc - 1, link->child_loc_map)) { - e_err(drv, "Filter: %x exists in hash table: %x\n", - loc, uhtid); - err = -EINVAL; - goto free_mask; - } - set_bit(loc - 1, link->child_loc_map); - } kfree(mask); return err; err_out_w_lock: spin_unlock(&adapter->fdir_perfect_lock); err_out: - kfree(input); -free_mask: kfree(mask); +free_input: + kfree(input); free_jump: kfree(jump); return err; -- 2.20.1