From: Michael Chan <michael.chan@broadcom.com>
Date: Sat, 31 Mar 2018 13:54:14 -0400
Subject: bnxt_en: Improve resource accounting for SRIOV.
Patch-mainline: v4.17-rc1
Git-commit: 596f9d55feebdf31c03172fcc82cdec62bb969ea
References: bsc#1086282 FATE#324873

When VFs are created, the current code subtracts the maximum VF
resources from the PF's pool.  This under-estimates the resources
remaining in the PF pool.  Instead, we should subtract the minimum
VF resources.  The VF minimum resources are guaranteed to the VFs
and only these should be subtracted from the PF's pool.

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_sriov.c |   18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c
@@ -510,18 +510,16 @@ static int bnxt_hwrm_func_vf_resc_cfg(st
 	}
 	mutex_unlock(&bp->hwrm_cmd_lock);
 	if (pf->active_vfs) {
-		u16 n = 1;
+		u16 n = pf->active_vfs;
 
-		if (pf->vf_resv_strategy != BNXT_VF_RESV_STRATEGY_MINIMAL)
-			n = pf->active_vfs;
-
-		hw_resc->max_tx_rings -= vf_tx_rings * n;
-		hw_resc->max_rx_rings -= vf_rx_rings * n;
-		hw_resc->max_hw_ring_grps -= vf_ring_grps * n;
-		hw_resc->max_cp_rings -= vf_cp_rings * n;
+		hw_resc->max_tx_rings -= le16_to_cpu(req.min_tx_rings) * n;
+		hw_resc->max_rx_rings -= le16_to_cpu(req.min_rx_rings) * n;
+		hw_resc->max_hw_ring_grps -= le16_to_cpu(req.min_hw_ring_grps) *
+					     n;
+		hw_resc->max_cp_rings -= le16_to_cpu(req.min_cmpl_rings) * n;
 		hw_resc->max_rsscos_ctxs -= pf->active_vfs;
-		hw_resc->max_stat_ctxs -= vf_stat_ctx * n;
-		hw_resc->max_vnics -= vf_vnics * n;
+		hw_resc->max_stat_ctxs -= le16_to_cpu(req.min_stat_ctx) * n;
+		hw_resc->max_vnics -= le16_to_cpu(req.min_vnics) * n;
 
 		rc = pf->active_vfs;
 	}