netdev - [PATCH v2 net-next 04/10] s390/qeth: extract helpers for next-hop lookup

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Message-Id: <20200506080949.3915-5-jwi@linux.ibm.com>
Date:   Wed,  6 May 2020 10:09:43 +0200
From:   Julian Wiedmann <jwi@...ux.ibm.com>
To:     David Miller <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Ursula Braun <ubraun@...ux.ibm.com>,
        Julian Wiedmann <jwi@...ux.ibm.com>
Subject: [PATCH v2 net-next 04/10] s390/qeth: extract helpers for next-hop lookup

These will be used in a subsequent patch.

Signed-off-by: Julian Wiedmann <jwi@...ux.ibm.com>
---
 drivers/s390/net/qeth_core.h    | 29 ++++++++++++++++++++++-------
 drivers/s390/net/qeth_l3_main.c | 18 +++++-------------
 2 files changed, 27 insertions(+), 20 deletions(-)

diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index 3d8b8e0f2438..6b0d37d2c638 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -34,6 +34,7 @@
 #include <net/ipv6.h>
 #include <net/if_inet6.h>
 #include <net/addrconf.h>
+#include <net/route.h>
 #include <net/sch_generic.h>
 #include <net/tcp.h>
 
@@ -234,11 +235,7 @@ struct qeth_hdr_layer3 {
 	__u16 frame_offset;
 	union {
 		/* TX: */
-		struct in6_addr ipv6_addr;
-		struct ipv4 {
-			u8 res[12];
-			u32 addr;
-		} ipv4;
+		struct in6_addr addr;
 		/* RX: */
 		struct rx {
 			u8 res1[2];
@@ -355,8 +352,7 @@ static inline bool qeth_l3_same_next_hop(struct qeth_hdr_layer3 *h1,
 					 struct qeth_hdr_layer3 *h2)
 {
 	return !((h1->flags ^ h2->flags) & QETH_HDR_IPV6) &&
-	       ipv6_addr_equal(&h1->next_hop.ipv6_addr,
-			       &h2->next_hop.ipv6_addr);
+	       ipv6_addr_equal(&h1->next_hop.addr, &h2->next_hop.addr);
 }
 
 struct qeth_local_addr {
@@ -945,6 +941,25 @@ static inline struct dst_entry *qeth_dst_check_rcu(struct sk_buff *skb, int ipv)
 	return dst;
 }
 
+static inline __be32 qeth_next_hop_v4_rcu(struct sk_buff *skb,
+					  struct dst_entry *dst)
+{
+	struct rtable *rt = (struct rtable *) dst;
+
+	return (rt) ? rt_nexthop(rt, ip_hdr(skb)->daddr) : ip_hdr(skb)->daddr;
+}
+
+static inline struct in6_addr *qeth_next_hop_v6_rcu(struct sk_buff *skb,
+						    struct dst_entry *dst)
+{
+	struct rt6_info *rt = (struct rt6_info *) dst;
+
+	if (rt && !ipv6_addr_any(&rt->rt6i_gateway))
+		return &rt->rt6i_gateway;
+	else
+		return &ipv6_hdr(skb)->daddr;
+}
+
 static inline void qeth_tx_csum(struct sk_buff *skb, u8 *flags, int ipv)
 {
 	*flags |= QETH_HDR_EXT_CSUM_TRANSP_REQ;
diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index fec4ac41e946..1e50aa0297a3 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -1694,8 +1694,8 @@ static void qeth_l3_fill_header(struct qeth_qdio_out_q *queue,
 
 		if (skb->protocol == htons(ETH_P_AF_IUCV)) {
 			l3_hdr->flags = QETH_HDR_IPV6 | QETH_CAST_UNICAST;
-			l3_hdr->next_hop.ipv6_addr.s6_addr16[0] = htons(0xfe80);
-			memcpy(&l3_hdr->next_hop.ipv6_addr.s6_addr32[2],
+			l3_hdr->next_hop.addr.s6_addr16[0] = htons(0xfe80);
+			memcpy(&l3_hdr->next_hop.addr.s6_addr32[2],
 			       iucv_trans_hdr(skb)->destUserID, 8);
 			return;
 		}
@@ -1729,18 +1729,10 @@ static void qeth_l3_fill_header(struct qeth_qdio_out_q *queue,
 	l3_hdr->flags |= qeth_l3_cast_type_to_flag(cast_type);
 
 	if (ipv == 4) {
-		struct rtable *rt = (struct rtable *) dst;
-
-		*((__be32 *) &hdr->hdr.l3.next_hop.ipv4.addr) = (rt) ?
-				rt_nexthop(rt, ip_hdr(skb)->daddr) :
-				ip_hdr(skb)->daddr;
+		l3_hdr->next_hop.addr.s6_addr32[3] =
+					qeth_next_hop_v4_rcu(skb, dst);
 	} else if (ipv == 6) {
-		struct rt6_info *rt = (struct rt6_info *) dst;
-
-		if (rt && !ipv6_addr_any(&rt->rt6i_gateway))
-			l3_hdr->next_hop.ipv6_addr = rt->rt6i_gateway;
-		else
-			l3_hdr->next_hop.ipv6_addr = ipv6_hdr(skb)->daddr;
+		l3_hdr->next_hop.addr = *qeth_next_hop_v6_rcu(skb, dst);
 
 		hdr->hdr.l3.flags |= QETH_HDR_IPV6;
 		if (!IS_IQD(card))
-- 
2.17.1