[PATCH v2 net-next] netdevsim: Fix build error without CONFIG_INET

[YueHaibing]

If CONFIG_INET is not set, building fails:

drivers/net/netdevsim/dev.o: In function `nsim_dev_trap_report_work':
dev.c:(.text+0x67b): undefined reference to `ip_send_check'

Use ip_fast_csum instead of ip_send_check to avoid
dependencies on CONFIG_INET.

Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Fixes: da58f90f11f5 ("netdevsim: Add devlink-trap support")
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
v2: use ip_fast_csum instead of ip_send_check
---
 drivers/net/netdevsim/dev.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
index c5b0261..39cdb6c 100644
--- a/drivers/net/netdevsim/dev.c
+++ b/drivers/net/netdevsim/dev.c
@@ -389,7 +389,8 @@ static struct sk_buff *nsim_dev_trap_skb_build(void)
 	iph->ihl = 0x5;
 	iph->tot_len = htons(tot_len);
 	iph->ttl = 100;
-	ip_send_check(iph);
+	iph->check = 0;
+	iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
 
 	udph = skb_put_zero(skb, sizeof(struct udphdr) + data_len);
 	get_random_bytes(&udph->source, sizeof(u16));
-- 
2.7.4