netdev - [PATCH net-next 1/2] net: enetc: don't depend on system endianness in enetc_set_vlan_ht

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Date:   Wed, 24 Mar 2021 17:44:54 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Claudiu Manoil <claudiu.manoil@....com>,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: [PATCH net-next 1/2] net: enetc: don't depend on system endianness in enetc_set_vlan_ht_filter

From: Vladimir Oltean <vladimir.oltean@....com>

ENETC has a 64-entry hash table for VLAN RX filtering per Station
Interface, which is accessed through two 32-bit registers: VHFR0 holding
the low portion, and VHFR1 holding the high portion.

The enetc_set_vlan_ht_filter function looks at the pf->vlan_ht_filter
bitmap, which is fundamentally an unsigned long variable, and casts it
to a u32 array of two elements. It puts the first u32 element into VHFR0
and the second u32 element into VHFR1.

It is easy to imagine that this will not work on big endian systems
(although, yes, we have bigger problems, because currently enetc assumes
that the CPU endianness is equal to the controller endianness, aka
little endian - but let's assume that we could add a cpu_to_le32 in
enetc_wd_reg and a le32_to_cpu in enetc_rd_reg).

Let's use lower_32_bits and upper_32_bits which are designed to work
regardless of endianness.

Tested that both the old and the new method produce the same results:

$ ethtool -K eth1 rx-vlan-filter on
$ ip link add link eth1 name eth1.100 type vlan id 100
enetc_set_vlan_ht_filter: method 1: si_idx 0 VHFR0 0x0 VHFR1 0x20
enetc_set_vlan_ht_filter: method 2: si_idx 0 VHFR0 0x0 VHFR1 0x20
$ ip link add link eth1 name eth1.101 type vlan id 101
enetc_set_vlan_ht_filter: method 1: si_idx 0 VHFR0 0x0 VHFR1 0x30
enetc_set_vlan_ht_filter: method 2: si_idx 0 VHFR0 0x0 VHFR1 0x30
$ ip link add link eth1 name eth1.34 type vlan id 34
enetc_set_vlan_ht_filter: method 1: si_idx 0 VHFR0 0x0 VHFR1 0x34
enetc_set_vlan_ht_filter: method 2: si_idx 0 VHFR0 0x0 VHFR1 0x34
$ ip link add link eth1 name eth1.1024 type vlan id 1024
enetc_set_vlan_ht_filter: method 1: si_idx 0 VHFR0 0x1 VHFR1 0x34
enetc_set_vlan_ht_filter: method 2: si_idx 0 VHFR0 0x1 VHFR1 0x34

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/ethernet/freescale/enetc/enetc_pf.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc_pf.c b/drivers/net/ethernet/freescale/enetc/enetc_pf.c
index 3a7a9102eccb..9c69ca516192 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_pf.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_pf.c
@@ -248,10 +248,10 @@ static void enetc_pf_set_rx_mode(struct net_device *ndev)
 }
 
 static void enetc_set_vlan_ht_filter(struct enetc_hw *hw, int si_idx,
-				     u32 *hash)
+				     unsigned long hash)
 {
-	enetc_port_wr(hw, ENETC_PSIVHFR0(si_idx), *hash);
-	enetc_port_wr(hw, ENETC_PSIVHFR1(si_idx), *(hash + 1));
+	enetc_port_wr(hw, ENETC_PSIVHFR0(si_idx), lower_32_bits(hash));
+	enetc_port_wr(hw, ENETC_PSIVHFR1(si_idx), upper_32_bits(hash));
 }
 
 static int enetc_vid_hash_idx(unsigned int vid)
@@ -279,7 +279,7 @@ static void enetc_sync_vlan_ht_filter(struct enetc_pf *pf, bool rehash)
 		}
 	}
 
-	enetc_set_vlan_ht_filter(&pf->si->hw, 0, (u32 *)pf->vlan_ht_filter);
+	enetc_set_vlan_ht_filter(&pf->si->hw, 0, *pf->vlan_ht_filter);
 }
 
 static int enetc_vlan_rx_add_vid(struct net_device *ndev, __be16 prot, u16 vid)
-- 
2.25.1