crypto/chtls: Enable tcp window scaling option

Enable tcp window scaling option in hw based on sysctl settings
and option in connection request.

v1->v2:
- Set window scale option based on option in connection request.
Signed-off-by: NVinay Kumar Yadav <vinay.yadav@chelsio.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/crypto/chelsio/chtls/chtls_cm.c

@@ -1056,6 +1056,7 @@ static void chtls_pass_accept_rpl(struct sk_buff *skb,
 	opt2 |= CONG_CNTRL_V(CONG_ALG_NEWRENO);
 	opt2 |= T5_ISS_F;
 	opt2 |= T5_OPT_2_VALID_F;
+	opt2 |= WND_SCALE_EN_V(WSCALE_OK(tp));
 	rpl5->opt0 = cpu_to_be64(opt0);
 	rpl5->opt2 = cpu_to_be32(opt2);
 	rpl5->iss = cpu_to_be32((prandom_u32() & ~7UL) - 1);