From d88d40b01c5c0dad6a1dca3b18267849eef4a2a9 Mon Sep 17 00:00:00 2001 From: Jacob Keller Date: Fri, 2 Dec 2016 12:32:59 -0800 Subject: [PATCH] i40e: allow i40e_update_filter_state to skip broadcast filters Fix a bug where we modified the mac_filter_hash while outside a lock, when handling addition of broadcast filters. Normally, we add filters to firmware by batching the additions into lists and issuing 1 update for every few filters. Broadcast filters are handled differently, by instead setting the broadcast promiscuous mode flags. In order to make sure the 1<->1 mapping of filters in our addition array lined up with filters in the hlist tmp_add_list, we had to remove the filter and move it back to the main hash. However, we didn't do this under lock, which could cause consistency problems for the list. Fix this by updating i40e_update_filter_state logic so that it knows to avoid broadcast filters. This ensures that we don't have to remove the filter separately, and can put it back using the normal flow. Change-ID: Id288fade80b3e3a9a54b68cc249188cb95147518 Signed-off-by: Jacob Keller Tested-by: Andrew Bowers Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/i40e/i40e_main.c | 37 ++++++++++++++++----- 1 file changed, 29 insertions(+), 8 deletions(-) diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c index fa4a04da47b7..06c80d4162af 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_main.c +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c @@ -1842,6 +1842,31 @@ static void i40e_undo_filter_entries(struct i40e_vsi *vsi, } } +/** + * i40e_next_entry - Get the next non-broadcast filter from a list + * @f: pointer to filter in list + * + * Returns the next non-broadcast filter in the list. Required so that we + * ignore broadcast filters within the list, since these are not handled via + * the normal firmware update path. + */ +static struct i40e_mac_filter *i40e_next_filter(struct i40e_mac_filter *f) +{ + while (f) { + f = hlist_entry(f->hlist.next, + typeof(struct i40e_mac_filter), + hlist); + + /* keep going if we found a broadcast filter */ + if (f && is_broadcast_ether_addr(f->macaddr)) + continue; + + break; + } + + return f; +} + /** * i40e_update_filter_state - Update filter state based on return data * from firmware @@ -1874,9 +1899,9 @@ i40e_update_filter_state(int count, retval++; } - add_head = hlist_entry(add_head->hlist.next, - typeof(struct i40e_mac_filter), - hlist); + add_head = i40e_next_filter(add_head); + if (!add_head) + break; } return retval; @@ -2095,7 +2120,7 @@ int i40e_sync_vsi_filters(struct i40e_vsi *vsi) cmd_flags = 0; /* handle broadcast filters by updating the broadcast - * promiscuous flag instead of deleting a MAC filter. + * promiscuous flag and release filter list. */ if (is_broadcast_ether_addr(f->macaddr)) { i40e_aqc_broadcast_filter(vsi, vsi_name, f); @@ -2164,11 +2189,7 @@ int i40e_sync_vsi_filters(struct i40e_vsi *vsi) * promiscuous flag instead of adding a MAC filter. */ if (is_broadcast_ether_addr(f->macaddr)) { - u64 key = i40e_addr_to_hkey(f->macaddr); i40e_aqc_broadcast_filter(vsi, vsi_name, f); - - hlist_del(&f->hlist); - hash_add(vsi->mac_filter_hash, &f->hlist, key); continue; }