nfp: flower: implement host cmsg handler for LAG

Adds the control message handler to synchronize offloaded group config
with that of the kernel. Such messages are sent from fw to driver and
feature the following 3 flags:

- Data: an attached cmsg could not be processed - store for retransmission
- Xon: FW can accept new messages - retransmit any stored cmsgs
- Sync: full sync requested so retransmit all kernel LAG group info

Signed-off-by: John Hurley <john.hurley@netronome.com>
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/net/ethernet/netronome/nfp/flower/cmsg.c b/drivers/net/ethernet/netronome/nfp/flower/cmsg.c
index 03aae2ed9983..cb8565222621 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/cmsg.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/cmsg.c
@@ -242,6 +242,7 @@ nfp_flower_cmsg_process_one_rx(struct nfp_app *app, struct sk_buff *skb)
 	struct nfp_flower_priv *app_priv = app->priv;
 	struct nfp_flower_cmsg_hdr *cmsg_hdr;
 	enum nfp_flower_cmsg_type_port type;
+	bool skb_stored = false;
 
 	cmsg_hdr = nfp_flower_cmsg_get_hdr(skb);
 
@@ -260,8 +261,10 @@ nfp_flower_cmsg_process_one_rx(struct nfp_app *app, struct sk_buff *skb)
 		nfp_tunnel_keep_alive(app, skb);
 		break;
 	case NFP_FLOWER_CMSG_TYPE_LAG_CONFIG:
-		if (app_priv->flower_ext_feats & NFP_FL_FEATS_LAG)
+		if (app_priv->flower_ext_feats & NFP_FL_FEATS_LAG) {
+			skb_stored = nfp_flower_lag_unprocessed_msg(app, skb);
 			break;
+		}
 		/* fall through */
 	default:
 		nfp_flower_cmsg_warn(app, "Cannot handle invalid repr control type %u\n",
@@ -269,7 +272,8 @@ nfp_flower_cmsg_process_one_rx(struct nfp_app *app, struct sk_buff *skb)
 		goto out;
 	}
 
-	dev_consume_skb_any(skb);
+	if (!skb_stored)
+		dev_consume_skb_any(skb);
 	return;
 out:
 	dev_kfree_skb_any(skb);