target/linux/generic/backport-5.15/776-v6.1-02-net-dsa-qca8k-fix-ethtool-autocast-mib-for-big-endia.patch

   1 From 0d4636f7d72df3179b20a2d32b647881917a5e2a Mon Sep 17 00:00:00 2001
   2 From: Christian Marangi <ansuelsmth@gmail.com>
   3 Date: Wed, 12 Oct 2022 19:18:37 +0200
   4 Subject: [PATCH 2/2] net: dsa: qca8k: fix ethtool autocast mib for big-endian
   5  systems
   6
   7 The switch sends autocast mib in little-endian. This is problematic for
   8 big-endian system as the values needs to be converted.
   9
  10 Fix this by converting each mib value to cpu byte order.
  11
  12 Fixes: 5c957c7ca78c ("net: dsa: qca8k: add support for mib autocast in Ethernet packet")
  13 Tested-by: Pawel Dembicki <paweldembicki@gmail.com>
  14 Tested-by: Lech Perczak <lech.perczak@gmail.com>
  15 Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
  16 Signed-off-by: David S. Miller <davem@davemloft.net>
  17 ---
  18  drivers/net/dsa/qca/qca8k-8xxx.c | 20 ++++++++------------
  19  include/linux/dsa/tag_qca.h      |  2 +-
  20  2 files changed, 9 insertions(+), 13 deletions(-)
  21
  22 --- a/drivers/net/dsa/qca/qca8k-8xxx.c
  23 +++ b/drivers/net/dsa/qca/qca8k-8xxx.c
  24 @@ -1668,9 +1668,9 @@ static void qca8k_mib_autocast_handler(s
  25         struct qca8k_priv *priv = ds->priv;
  26         const struct qca8k_mib_desc *mib;
  27         struct mib_ethhdr *mib_ethhdr;
  28 -       int i, mib_len, offset = 0;
  29 -       u64 *data;
  30 +       __le32 *data2;
  31         u8 port;
  32 +       int i;
  33
  34         mib_ethhdr = (struct mib_ethhdr *)skb_mac_header(skb);
  35         mib_eth_data = &priv->mib_eth_data;
  36 @@ -1682,28 +1682,24 @@ static void qca8k_mib_autocast_handler(s
  37         if (port != mib_eth_data->req_port)
  38                 goto exit;
  39
  40 -       data = mib_eth_data->data;
  41 +       data2 = (__le32 *)skb->data;
  42
  43         for (i = 0; i < priv->info->mib_count; i++) {
  44                 mib = &ar8327_mib[i];
  45
  46                 /* First 3 mib are present in the skb head */
  47                 if (i < 3) {
  48 -                       data[i] = mib_ethhdr->data[i];
  49 +                       mib_eth_data->data[i] = get_unaligned_le32(mib_ethhdr->data + i);
  50                         continue;
  51                 }
  52
  53 -               mib_len = sizeof(uint32_t);
  54 -
  55                 /* Some mib are 64 bit wide */
  56                 if (mib->size == 2)
  57 -                       mib_len = sizeof(uint64_t);
  58 -
  59 -               /* Copy the mib value from packet to the */
  60 -               memcpy(data + i, skb->data + offset, mib_len);
  61 +                       mib_eth_data->data[i] = get_unaligned_le64((__le64 *)data2);
  62 +               else
  63 +                       mib_eth_data->data[i] = get_unaligned_le32(data2);
  64
  65 -               /* Set the offset for the next mib */
  66 -               offset += mib_len;
  67 +               data2 += mib->size;
  68         }
  69
  70  exit:
  71 --- a/include/linux/dsa/tag_qca.h
  72 +++ b/include/linux/dsa/tag_qca.h
  73 @@ -68,7 +68,7 @@ enum mdio_cmd {
  74  };
  75
  76  struct mib_ethhdr {
  77 -       u32 data[3];            /* first 3 mib counter */
  78 +       __le32 data[3];         /* first 3 mib counter */
  79         __be16 hdr;             /* qca hdr */
  80  } __packed;
  81