netdev - [PATCH net-next 08/14] bnxt_en: Reserve resources for RFS.

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Message-Id: <1516177276-9722-9-git-send-email-michael.chan@broadcom.com>
Date:   Wed, 17 Jan 2018 03:21:10 -0500
From:   Michael Chan <michael.chan@...adcom.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org
Subject: [PATCH net-next 08/14] bnxt_en: Reserve resources for RFS.

In bnxt_rfs_capable(), add call to reserve vnic resources to support
NTUPLE.  Return true if we can successfully reserve enough vnics.
Otherwise, reserve the minimum 1 VNIC for normal operations not
supporting NTUPLE and return false.

Also, suppress warning message about not enough resources for NTUPLE when
only 1 RX ring is in use.  NTUPLE filters by definition require multiple
RX rings.

Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 6fc324f..8b74e6e 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -7064,13 +7064,26 @@ static bool bnxt_rfs_capable(struct bnxt *bp)
 	if (bp->flags & BNXT_FLAG_NEW_RSS_CAP)
 		max_rss_ctxs = max_vnics;
 	if (vnics > max_vnics || vnics > max_rss_ctxs) {
-		netdev_warn(bp->dev,
-			    "Not enough resources to support NTUPLE filters, enough resources for up to %d rx rings\n",
-			    min(max_rss_ctxs - 1, max_vnics - 1));
+		if (bp->rx_nr_rings > 1)
+			netdev_warn(bp->dev,
+				    "Not enough resources to support NTUPLE filters, enough resources for up to %d rx rings\n",
+				    min(max_rss_ctxs - 1, max_vnics - 1));
 		return false;
 	}

-	return true;
+	if (!(bp->flags & BNXT_FLAG_NEW_RM))
+		return true;
+
+	if (vnics == bp->hw_resc.resv_vnics)
+		return true;
+
+	bnxt_hwrm_reserve_rings(bp, 0, 0, 0, 0, vnics);
+	if (vnics <= bp->hw_resc.resv_vnics)
+		return true;
+
+	netdev_warn(bp->dev, "Unable to reserve resources to support NTUPLE filters.\n");
+	bnxt_hwrm_reserve_rings(bp, 0, 0, 0, 0, 1);
+	return false;
 #else
 	return false;
 #endif
-- 
1.8.3.1