netdev - [PATCH net 3/4] bnxt_en: Fix NQ/CP rings accounting on the new 57500 chips.

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Message-Id: <1544356862-3462-4-git-send-email-michael.chan@broadcom.com>
Date:   Sun,  9 Dec 2018 07:01:01 -0500
From:   Michael Chan <michael.chan@...adcom.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org
Subject: [PATCH net 3/4] bnxt_en: Fix NQ/CP rings accounting on the new 57500 chips.

The new 57500 chips have introduced the NQ structure in addition to
the existing CP rings in all chips.  We need to introduce a new
bnxt_nq_rings_in_use().  On legacy chips, the 2 functions are the
same and one will just call the other.  On the new chips, they
refer to the 2 separate ring structures.  The new function is now
called to determine the resource (NQ or CP rings) associated with
MSIX that are in use.

On 57500 chips, the RDMA driver does not use the CP rings so
we don't need to do the subtraction adjustment.

Fixes: 41e8d7983752 ("bnxt_en: Modify the ring reservation functions for 57500 series chips.")
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index c39820b..2e90d98 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -5354,7 +5354,7 @@ static int bnxt_hwrm_reserve_rings(struct bnxt *bp, int tx, int rx, int grp,
 		return bnxt_hwrm_reserve_vf_rings(bp, tx, rx, grp, cp, vnic);
 }
 
-static int bnxt_cp_rings_in_use(struct bnxt *bp)
+static int bnxt_nq_rings_in_use(struct bnxt *bp)
 {
 	int cp = bp->cp_nr_rings;
 	int ulp_msix, ulp_base;
@@ -5369,10 +5369,22 @@ static int bnxt_cp_rings_in_use(struct bnxt *bp)
 	return cp;
 }
 
+static int bnxt_cp_rings_in_use(struct bnxt *bp)
+{
+	int cp;
+
+	if (!(bp->flags & BNXT_FLAG_CHIP_P5))
+		return bnxt_nq_rings_in_use(bp);
+
+	cp = bp->tx_nr_rings + bp->rx_nr_rings;
+	return cp;
+}
+
 static bool bnxt_need_reserve_rings(struct bnxt *bp)
 {
 	struct bnxt_hw_resc *hw_resc = &bp->hw_resc;
 	int cp = bnxt_cp_rings_in_use(bp);
+	int nq = bnxt_nq_rings_in_use(bp);
 	int rx = bp->rx_nr_rings;
 	int vnic = 1, grp = rx;
 
@@ -5388,7 +5400,7 @@ static bool bnxt_need_reserve_rings(struct bnxt *bp)
 		rx <<= 1;
 	if (BNXT_NEW_RM(bp) &&
 	    (hw_resc->resv_rx_rings != rx || hw_resc->resv_cp_rings != cp ||
-	     hw_resc->resv_vnics != vnic ||
+	     hw_resc->resv_irqs < nq || hw_resc->resv_vnics != vnic ||
 	     (hw_resc->resv_hw_ring_grps != grp &&
 	      !(bp->flags & BNXT_FLAG_CHIP_P5))))
 		return true;
@@ -5398,7 +5410,7 @@ static bool bnxt_need_reserve_rings(struct bnxt *bp)
 static int __bnxt_reserve_rings(struct bnxt *bp)
 {
 	struct bnxt_hw_resc *hw_resc = &bp->hw_resc;
-	int cp = bnxt_cp_rings_in_use(bp);
+	int cp = bnxt_nq_rings_in_use(bp);
 	int tx = bp->tx_nr_rings;
 	int rx = bp->rx_nr_rings;
 	int grp, rx_rings, rc;
@@ -5423,7 +5435,7 @@ static int __bnxt_reserve_rings(struct bnxt *bp)
 	tx = hw_resc->resv_tx_rings;
 	if (BNXT_NEW_RM(bp)) {
 		rx = hw_resc->resv_rx_rings;
-		cp = hw_resc->resv_cp_rings;
+		cp = hw_resc->resv_irqs;
 		grp = hw_resc->resv_hw_ring_grps;
 		vnic = hw_resc->resv_vnics;
 	}
@@ -7034,7 +7046,12 @@ unsigned int bnxt_get_max_func_cp_rings(struct bnxt *bp)
 
 unsigned int bnxt_get_max_func_cp_rings_for_en(struct bnxt *bp)
 {
-	return bp->hw_resc.max_cp_rings - bnxt_get_ulp_msix_num(bp);
+	unsigned int cp = bp->hw_resc.max_cp_rings;
+
+	if (!(bp->flags & BNXT_FLAG_CHIP_P5))
+		cp -= bnxt_get_ulp_msix_num(bp);
+
+	return cp;
 }
 
 static unsigned int bnxt_get_max_func_irqs(struct bnxt *bp)
@@ -7076,7 +7093,7 @@ static int bnxt_get_num_msix(struct bnxt *bp)
 	if (!BNXT_NEW_RM(bp))
 		return bnxt_get_max_func_irqs(bp);
 
-	return bnxt_cp_rings_in_use(bp);
+	return bnxt_nq_rings_in_use(bp);
 }
 
 static int bnxt_init_msix(struct bnxt *bp)
-- 
2.5.1