From: Michael Chan <michael.chan@broadcom.com>
Date: Wed, 17 Jan 2018 03:21:05 -0500
Subject: bnxt_en: Restore MSIX after disabling SRIOV.
Patch-mainline: v4.16-rc1
Git-commit: 80fcaf46c09262a71f32bb577c976814c922f864
References: bsc#1086282 FATE#324873

After SRIOV has been enabled and disabled, the MSIX vectors assigned to
the VFs have to be re-initialized.  Otherwise they cannot be re-used by
the PF.  For example, increasing the number of PF rings after disabling
SRIOV may fail if the PF uses MSIX vectors previously assigned to the VFs.

To fix this, we add logic in bnxt_restore_pf_fw_resources() to close the
NIC, clear and re-init MSIX, and re-open the NIC.

Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c |   16 ++++++++++++++--
 drivers/net/ethernet/broadcom/bnxt/bnxt.h |    2 +-
 2 files changed, 15 insertions(+), 3 deletions(-)

--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -7977,11 +7977,23 @@ static int bnxt_set_dflt_rings(struct bn
 	return rc;
 }
 
-void bnxt_restore_pf_fw_resources(struct bnxt *bp)
+int bnxt_restore_pf_fw_resources(struct bnxt *bp)
 {
+	int rc;
+
 	ASSERT_RTNL();
+	if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP))
+		return 0;
+
 	bnxt_hwrm_func_qcaps(bp);
-	bnxt_subtract_ulp_resources(bp, BNXT_ROCE_ULP);
+	__bnxt_close_nic(bp, true, false);
+	bnxt_clear_int_mode(bp);
+	rc = bnxt_init_int_mode(bp);
+	if (rc)
+		dev_close(bp->dev);
+	else
+		rc = bnxt_open_nic(bp, true, false);
+	return rc;
 }
 
 static int bnxt_init_mac_addr(struct bnxt *bp)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -1421,6 +1421,6 @@ int bnxt_check_rings(struct bnxt *bp, in
 		     int tx_xdp);
 int bnxt_setup_mq_tc(struct net_device *dev, u8 tc);
 int bnxt_get_max_rings(struct bnxt *, int *, int *, bool);
-void bnxt_restore_pf_fw_resources(struct bnxt *bp);
+int bnxt_restore_pf_fw_resources(struct bnxt *bp);
 int bnxt_port_attr_get(struct bnxt *bp, struct switchdev_attr *attr);
 #endif