1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 /* Copyright (C) 2018 Netronome Systems, Inc */
3 /* Copyright (C) 2021 Corigine, Inc */
4 
5 #include <net/xfrm.h>
6 
7 #include "../nfp_net.h"
8 #include "nfd3.h"
9 
nfp_nfd3_ipsec_tx(struct nfp_nfd3_tx_desc * txd,struct sk_buff * skb)10 void nfp_nfd3_ipsec_tx(struct nfp_nfd3_tx_desc *txd, struct sk_buff *skb)
11 {
12 	struct xfrm_state *x = xfrm_input_state(skb);
13 	struct xfrm_offload *xo = xfrm_offload(skb);
14 	struct iphdr *iph = ip_hdr(skb);
15 	int l4_proto;
16 
17 	if (x->xso.dev && (x->xso.dev->features & NETIF_F_HW_ESP_TX_CSUM)) {
18 		txd->flags |= NFD3_DESC_TX_CSUM;
19 
20 		if (iph->version == 4)
21 			txd->flags |= NFD3_DESC_TX_IP4_CSUM;
22 
23 		if (x->props.mode == XFRM_MODE_TRANSPORT)
24 			l4_proto = xo->proto;
25 		else if (x->props.mode == XFRM_MODE_TUNNEL)
26 			l4_proto = xo->inner_ipproto;
27 		else
28 			return;
29 
30 		switch (l4_proto) {
31 		case IPPROTO_UDP:
32 			txd->flags |= NFD3_DESC_TX_UDP_CSUM;
33 			return;
34 		case IPPROTO_TCP:
35 			txd->flags |= NFD3_DESC_TX_TCP_CSUM;
36 			return;
37 		}
38 	}
39 }
40