linux-kernel - [PATCH 4.14 079/246] net: hns3: Fixes the init of the VALID BD info in the descriptor

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Message-Id: <20180801165015.496886651@linuxfoundation.org>
Date:   Wed,  1 Aug 2018 18:49:49 +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, Fuyun Liang <liangfuyun1@...wei.com>,
        Peng Li <lipeng321@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 079/246] net: hns3: Fixes the init of the VALID BD info in the descriptor

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Fuyun Liang <liangfuyun1@...wei.com>

[ Upstream commit 7d0b130cbbfa4651cc1ab9268a2956c1b9d82ff9 ]

RX Buffer Descriptor contains a VALID bit which indicates if the BD
is valid and has some data. This field is set by HNS3 hardware to
intimate the driver of some valid data present in the BD. nd should
be reset by the driver when BD is being used again. In the existing
code this bit was not being (re-)initialized properly and hence was
causing problems.

Fixes: 76ad4f0ee747 ("net: hns3: Add support of HNS3 Ethernet Driver for hip08 SoC")
Signed-off-by: Fuyun Liang <liangfuyun1@...wei.com>
Signed-off-by: Peng Li <lipeng321@...wei.com>
Signed-off-by: Salil Mehta <salil.mehta@...wei.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c
@@ -1598,6 +1598,7 @@ static void hns3_replace_buffer(struct h
 	hns3_unmap_buffer(ring, &ring->desc_cb[i]);
 	ring->desc_cb[i] = *res_cb;
 	ring->desc[i].addr = cpu_to_le64(ring->desc_cb[i].dma);
+	ring->desc[i].rx.bd_base_info = 0;
 }
 
 static void hns3_reuse_buffer(struct hns3_enet_ring *ring, int i)
@@ -1605,6 +1606,7 @@ static void hns3_reuse_buffer(struct hns
 	ring->desc_cb[i].reuse_flag = 0;
 	ring->desc[i].addr = cpu_to_le64(ring->desc_cb[i].dma
 		+ ring->desc_cb[i].page_offset);
+	ring->desc[i].rx.bd_base_info = 0;
 }
 
 static void hns3_nic_reclaim_one_desc(struct hns3_enet_ring *ring, int *bytes,