linux-kernel - [PATCH 5.13 064/113] net: hns3: fix get wrong pfc

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Date:   Wed,  1 Sep 2021 14:28:19 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Guangbin Huang <huangguangbin2@...wei.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.13 064/113] net: hns3: fix get wrong pfc_en when query PFC configuration

From: Guangbin Huang <huangguangbin2@...wei.com>

[ Upstream commit 8c1671e0d13d4a0ba4fb3a0da932bf3736d7ff73 ]

Currently, when query PFC configuration by dcbtool, driver will return
PFC enable status based on TC. As all priorities are mapped to TC0 by
default, if TC0 is enabled, then all priorities mapped to TC0 will be
shown as enabled status when query PFC setting, even though some
priorities have never been set.

for example:
$ dcb pfc show dev eth0
pfc-cap 4 macsec-bypass off delay 0
prio-pfc 0:off 1:off 2:off 3:off 4:off 5:off 6:off 7:off
$ dcb pfc set dev eth0 prio-pfc 0:on 1:on 2:on 3:on
$ dcb pfc show dev eth0
pfc-cap 4 macsec-bypass off delay 0
prio-pfc 0:on 1:on 2:on 3:on 4:on 5:on 6:on 7:on

To fix this problem, just returns user's PFC config parameter saved in
driver.

Fixes: cacde272dd00 ("net: hns3: Add hclge_dcb module for the support of DCB feature")
Signed-off-by: Guangbin Huang <huangguangbin2@...wei.com>
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 .../net/ethernet/hisilicon/hns3/hns3pf/hclge_dcb.c  | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_dcb.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_dcb.c
index 5bf5db91d16c..39f56f245d84 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_dcb.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_dcb.c
@@ -255,21 +255,12 @@ static int hclge_ieee_getpfc(struct hnae3_handle *h, struct ieee_pfc *pfc)
 	u64 requests[HNAE3_MAX_TC], indications[HNAE3_MAX_TC];
 	struct hclge_vport *vport = hclge_get_vport(h);
 	struct hclge_dev *hdev = vport->back;
-	u8 i, j, pfc_map, *prio_tc;
 	int ret;
+	u8 i;
 
 	memset(pfc, 0, sizeof(*pfc));
 	pfc->pfc_cap = hdev->pfc_max;
-	prio_tc = hdev->tm_info.prio_tc;
-	pfc_map = hdev->tm_info.hw_pfc_map;
-
-	/* Pfc setting is based on TC */
-	for (i = 0; i < hdev->tm_info.num_tc; i++) {
-		for (j = 0; j < HNAE3_MAX_USER_PRIO; j++) {
-			if ((prio_tc[j] == i) && (pfc_map & BIT(i)))
-				pfc->pfc_en |= BIT(j);
-		}
-	}
+	pfc->pfc_en = hdev->tm_info.pfc_en;
 
 	ret = hclge_pfc_tx_stats_get(hdev, requests);
 	if (ret)
-- 
2.30.2