From: Avinash Dayanand <avinash.dayanand@intel.com>
Date: Wed, 27 Dec 2017 08:22:11 -0500
Subject: i40e: Fix kdump failure
Patch-mainline: v4.16-rc1
Git-commit: 69399873b6b50b1e40c1e35f75572e079759b020
References: bsc#1101816 FATE#325147 FATE#325149

kdump fails in the system when used in conjunction with Ethernet driver
X722/X710. This is mainly because when we are resource constrained i.e.
when we have just one online_cpus, we are enabling VMDq and iWARP. It
doesn't make sense to enable them with just one CPU and starve kdump
for lack of IRQs.

So don't enable VMDq or iWARP when we just have a single CPU.

Signed-off-by: Avinash Dayanand <avinash.dayanand@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/intel/i40e/i40e_main.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -9737,13 +9737,13 @@ static int i40e_sw_init(struct i40e_pf *
 	    pf->hw.aq.fw_maj_ver >= 6)
 		pf->hw_features |= I40E_HW_PTP_L4_CAPABLE;
 
-	if (pf->hw.func_caps.vmdq) {
+	if (pf->hw.func_caps.vmdq && num_online_cpus() != 1) {
 		pf->num_vmdq_vsis = I40E_DEFAULT_NUM_VMDQ_VSI;
 		pf->flags |= I40E_FLAG_VMDQ_ENABLED;
 		pf->num_vmdq_qps = i40e_default_queues_per_vmdq(pf);
 	}
 
-	if (pf->hw.func_caps.iwarp) {
+	if (pf->hw.func_caps.iwarp && num_online_cpus() != 1) {
 		pf->flags |= I40E_FLAG_IWARP_ENABLED;
 		/* IWARP needs one extra vector for CQP just like MISC.*/
 		pf->num_iwarp_msix = (int)num_online_cpus() + 1;