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From 0d4636f7d72df3179b20a2d32b647881917a5e2a Mon Sep 17 00:00:00 2001
From: Christian Marangi <ansuelsmth@gmail.com>
Date: Wed, 12 Oct 2022 19:18:37 +0200
Subject: [PATCH 2/2] net: dsa: qca8k: fix ethtool autocast mib for big-endian
systems
The switch sends autocast mib in little-endian. This is problematic for
big-endian system as the values needs to be converted.
Fix this by converting each mib value to cpu byte order.
Fixes: 5c957c7ca78c ("net: dsa: qca8k: add support for mib autocast in Ethernet packet")
Tested-by: Pawel Dembicki <paweldembicki@gmail.com>
Tested-by: Lech Perczak <lech.perczak@gmail.com>
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/dsa/qca/qca8k-8xxx.c | 20 ++++++++------------
include/linux/dsa/tag_qca.h | 2 +-
2 files changed, 9 insertions(+), 13 deletions(-)
--- a/drivers/net/dsa/qca/qca8k-8xxx.c
+++ b/drivers/net/dsa/qca/qca8k-8xxx.c
@@ -1668,9 +1668,9 @@ static void qca8k_mib_autocast_handler(s
struct qca8k_priv *priv = ds->priv;
const struct qca8k_mib_desc *mib;
struct mib_ethhdr *mib_ethhdr;
- int i, mib_len, offset = 0;
- u64 *data;
+ __le32 *data2;
u8 port;
+ int i;
mib_ethhdr = (struct mib_ethhdr *)skb_mac_header(skb);
mib_eth_data = &priv->mib_eth_data;
@@ -1682,28 +1682,24 @@ static void qca8k_mib_autocast_handler(s
if (port != mib_eth_data->req_port)
goto exit;
- data = mib_eth_data->data;
+ data2 = (__le32 *)skb->data;
for (i = 0; i < priv->info->mib_count; i++) {
mib = &ar8327_mib[i];
/* First 3 mib are present in the skb head */
if (i < 3) {
- data[i] = mib_ethhdr->data[i];
+ mib_eth_data->data[i] = get_unaligned_le32(mib_ethhdr->data + i);
continue;
}
- mib_len = sizeof(uint32_t);
-
/* Some mib are 64 bit wide */
if (mib->size == 2)
- mib_len = sizeof(uint64_t);
-
- /* Copy the mib value from packet to the */
- memcpy(data + i, skb->data + offset, mib_len);
+ mib_eth_data->data[i] = get_unaligned_le64((__le64 *)data2);
+ else
+ mib_eth_data->data[i] = get_unaligned_le32(data2);
- /* Set the offset for the next mib */
- offset += mib_len;
+ data2 += mib->size;
}
exit:
--- a/include/linux/dsa/tag_qca.h
+++ b/include/linux/dsa/tag_qca.h
@@ -68,7 +68,7 @@ enum mdio_cmd {
};
struct mib_ethhdr {
- u32 data[3]; /* first 3 mib counter */
+ __le32 data[3]; /* first 3 mib counter */
__be16 hdr; /* qca hdr */
} __packed;
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