[PATCH net-next 3/3] idpf: fix undefined reference to tcp_gro_complete() when !CONFIG_INET

[Alexander Lobakin]

When CONFIG_INET is not set, tcp_gro_complete is not compiled, although
the drivers using it may still be compiled (spotted by Randy):

aarch64-linux-ld: drivers/net/ethernet/intel/idpf/idpf_txrx.o:
in function `idpf_rx_rsc.isra.0':
drivers/net/ethernet/intel/idpf/idpf_txrx.c:2909:(.text+0x40cc):
undefined reference to `tcp_gro_complete'

The drivers need to guard the calls to it manually.
Return early from the RSC completion function if !CONFIG_INET, it won't
work properly either way. This effectively makes it be compiled-out
almost entirely on such builds.

Fixes: 3a8845af66ed ("idpf: add RX splitq napi poll support")
Reported-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Closes: https://lore.kernel.org/linux-next/4c84eb7b-3dec-467b-934b-8a0240f7fb12@xxxxxxxxxxxxx
Signed-off-by: Alexander Lobakin <aleksander.lobakin@xxxxxxxxx>
---
 drivers/net/ethernet/intel/idpf/idpf_txrx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.c b/drivers/net/ethernet/intel/idpf/idpf_txrx.c
index 6fa79898c42c..aa45afeb6496 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_txrx.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.c
@@ -2876,6 +2876,9 @@ static int idpf_rx_rsc(struct idpf_queue *rxq, struct sk_buff *skb,
 	if (unlikely(!(ipv4 ^ ipv6)))
 		return -EINVAL;
 
+	if (!IS_ENABLED(CONFIG_INET))
+		return 0;
+
 	rsc_segments = DIV_ROUND_UP(skb->data_len, rsc_seg_len);
 	if (unlikely(rsc_segments == 1))
 		return 0;
-- 
2.41.0