nfp: flower-ct: remove callback delete deadlock

The current location of the callback delete can lead to a race
condition where deleting the callback requires a write_lock on
the nf_table, but at the same time another thread from netfilter
could have taken a read lock on the table before trying to offload.
Since the driver is taking a rtnl_lock this can lead into a deadlock
situation, where the netfilter offload will wait for the cls_flower
rtnl_lock to be released, but this cannot happen since this is
waiting for the nf_table read_lock to be released before it can
delete the callback.

Solve this by completely removing the nf_flow_table_offload_del_cb
call, as this will now be cleaned up by act_ct itself when cleaning
up the specific nf_table.

Fixes: 62268e78145f ("nfp: flower-ct: add nft callback stubs")
Signed-off-by: Louis Peens <louis.peens@corigine.com>
Signed-off-by: Yinjun Zhang <yinjun.zhang@corigine.com>
Signed-off-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/netronome/nfp/flower/conntrack.c b/drivers/net/ethernet/netronome/nfp/flower/conntrack.c
index 273d529..128020b 100644 (file)
--- a/drivers/net/ethernet/netronome/nfp/flower/conntrack.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/conntrack.c
@@ -1141,20 +1141,7 @@ int nfp_fl_ct_del_flow(struct nfp_fl_ct_map_entry *ct_map_ent)
                nfp_fl_ct_clean_flow_entry(ct_entry);
                kfree(ct_map_ent);
 
-               /* If this is the last pre_ct_rule it means that it is
-                * very likely that the nft table will be cleaned up next,
-                * as this happens on the removal of the last act_ct flow.
-                * However we cannot deregister the callback on the removal
-                * of the last nft flow as this runs into a deadlock situation.
-                * So deregister the callback on removal of the last pre_ct flow
-                * and remove any remaining nft flow entries. We also cannot
-                * save this state and delete the callback later since the
-                * nft table would already have been freed at that time.
-                */
                if (!zt->pre_ct_count) {
-                       nf_flow_table_offload_del_cb(zt->nft,
-                                                    nfp_fl_ct_handle_nft_flow,
-                                                    zt);
                        zt->nft = NULL;
                        nfp_fl_ct_clean_nft_entries(zt);
                }