From: John Hurley Date: Tue, 27 Nov 2018 22:04:12 +0000 (-0800) Subject: nfp: flower: prevent offload if rhashtable insert fails X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=b5f0cf08340090d1503dbdbfd797e32264974100;p=openwrt%2Fstaging%2Fblogic.git nfp: flower: prevent offload if rhashtable insert fails For flow offload adds, if the rhash insert code fails, the flow will still have been offloaded but the reference to it in the driver freed. Re-order the offload setup calls to ensure that a flow will only be written to FW if a kernel reference is held and stored in the rhashtable. Remove this hashtable entry if the offload fails. Fixes: c01d0efa5136 ("nfp: flower: use rhashtable for flow caching") Signed-off-by: John Hurley Reviewed-by: Pieter Jansen van Vuuren Reviewed-by: Jakub Kicinski Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/netronome/nfp/flower/offload.c b/drivers/net/ethernet/netronome/nfp/flower/offload.c index c3ad8d737cf0..2f49eb75f3cc 100644 --- a/drivers/net/ethernet/netronome/nfp/flower/offload.c +++ b/drivers/net/ethernet/netronome/nfp/flower/offload.c @@ -476,17 +476,17 @@ nfp_flower_add_offload(struct nfp_app *app, struct net_device *netdev, if (err) goto err_destroy_flow; - err = nfp_flower_xmit_flow(netdev, flow_pay, - NFP_FLOWER_CMSG_TYPE_FLOW_ADD); - if (err) - goto err_release_metadata; - flow_pay->tc_flower_cookie = flow->cookie; err = rhashtable_insert_fast(&priv->flow_table, &flow_pay->fl_node, nfp_flower_table_params); if (err) goto err_release_metadata; + err = nfp_flower_xmit_flow(netdev, flow_pay, + NFP_FLOWER_CMSG_TYPE_FLOW_ADD); + if (err) + goto err_remove_rhash; + port->tc_offload_cnt++; /* Deallocate flow payload when flower rule has been destroyed. */ @@ -494,6 +494,10 @@ nfp_flower_add_offload(struct nfp_app *app, struct net_device *netdev, return 0; +err_remove_rhash: + WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table, + &flow_pay->fl_node, + nfp_flower_table_params)); err_release_metadata: nfp_modify_flow_metadata(app, flow_pay); err_destroy_flow: