linux-kernel - [PATCH] RDMA/irdma: fix building without IPv6

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Date:   Tue, 18 Jul 2023 21:38:09 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Mustafa Ismail <mustafa.ismail@...el.com>,
        Shiraz Saleem <shiraz.saleem@...el.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Sindhu Devale <sindhu.devale@...el.com>,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] RDMA/irdma: fix building without IPv6

From: Arnd Bergmann <arnd@...db.de>

The new irdma_iw_get_vlan_prio() function requires IPv6 support to build:

x86_64-linux-ld: drivers/infiniband/hw/irdma/cm.o: in function `irdma_iw_get_vlan_prio':
cm.c:(.text+0x2832): undefined reference to `ipv6_chk_addr'

Add a compile-time check in the same way as elsewhere in this file to avoid
this by conditionally leaving out the ipv6 specific bits.

Fixes: f877f22ac1e9b ("RDMA/irdma: Implement egress VLAN priority")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/infiniband/hw/irdma/cm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/irdma/cm.c b/drivers/infiniband/hw/irdma/cm.c
index 6b71b67ce9ff0..8ea55c6a3fba5 100644
--- a/drivers/infiniband/hw/irdma/cm.c
+++ b/drivers/infiniband/hw/irdma/cm.c
@@ -1562,7 +1562,7 @@ static u8 irdma_iw_get_vlan_prio(u32 *loc_addr, u8 prio, bool ipv4)
 	rcu_read_lock();
 	if (ipv4) {
 		ndev = ip_dev_find(&init_net, htonl(loc_addr[0]));
-	} else {
+	} else if (IS_ENABLED(CONFIG_IPV6)) {
 		struct net_device *ip_dev;
 		struct in6_addr laddr6;
 
-- 
2.39.2