staging/rdma/hfi1: Consider VL15 MTU also when calculating the maximum VL MTU

Currently, only MTUs of VLs 0-7 are checked when calculating the maximum VL
MTU which is used to set the port MTU capability in DCC_CFG_PORT_CONFIG CSR
This can cause a port MTU capability to be set to 0 if MTUs of VLs 0-7 is 0
This would affect the VL15 traffic.
Reviewed-by: Dean Luick <dean.luick@intel.com>
Reviewed-by: Arthur Kepner <arthur.kepner@intel.com>
Signed-off-by: Harish Chegondi <harish.chegondi@intel.com>
Signed-off-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rdma/hfi1/chip.c

@@ -9407,7 +9407,8 @@ u32 lrh_max_header_bytes(struct hfi1_devdata *dd)
 static void set_send_length(struct hfi1_pportdata *ppd)
 {
 	struct hfi1_devdata *dd = ppd->dd;
-	u32 max_hb = lrh_max_header_bytes(dd), maxvlmtu = 0, dcmtu;
+	u32 max_hb = lrh_max_header_bytes(dd), dcmtu;
+	u32 maxvlmtu = dd->vld[15].mtu;
 	u64 len1 = 0, len2 = (((dd->vld[15].mtu + max_hb) >> 2)
 			      & SEND_LEN_CHECK1_LEN_VL15_MASK) <<
 		SEND_LEN_CHECK1_LEN_VL15_SHIFT;