[PATCH] cxbgb4: Fix build failure when CHELSIO_TLS_DEVICE=n

[Tom Seewald]

After commit 9d2e5e9eeb59 ("cxgb4/ch_ktls: decrypted bit is not enough")
building the kernel with CHELSIO_T4=y and CHELSIO_TLS_DEVICE=n results
in the following error:

ld: drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.o: in function
`cxgb_select_queue':
cxgb4_main.c:(.text+0x2dac): undefined reference to `tls_validate_xmit_skb'

This is caused by cxgb_select_queue() calling cxgb4_is_ktls_skb() without
checking if CHELSIO_TLS_DEVICE=y. Fix this by calling cxgb4_is_ktls_skb()
only when this config option is enabled.

Fixes: 9d2e5e9eeb59 ("cxgb4/ch_ktls: decrypted bit is not enough")
Signed-off-by: Tom Seewald <tseew...@gmail.com>
---
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c 
b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
index 7fd264a6d085..8e8783afd6df 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
@@ -1176,7 +1176,9 @@ static u16 cxgb_select_queue(struct net_device *dev, 
struct sk_buff *skb,
                txq = netdev_pick_tx(dev, skb, sb_dev);
                if (xfrm_offload(skb) || is_ptp_enabled(skb, dev) ||
                    skb->encapsulation ||
-                   cxgb4_is_ktls_skb(skb) ||
+#if IS_ENABLED(CONFIG_CHELSIO_TLS_DEVICE)
+               cxgb4_is_ktls_skb(skb) ||
+#endif /* CHELSIO_TLS_DEVICE */
                    (proto != IPPROTO_TCP && proto != IPPROTO_UDP))
                        txq = txq % pi->nqsets;
 
-- 
2.20.1