target/linux/layerscape/patches-5.4/701-net-0032-sdk_dpaa-ls1043a-errata-restrict-the-max-mtu.patch

   1 From b204d76e9a64ec99f0151b7ca018f3b6df2bb1b7 Mon Sep 17 00:00:00 2001
   2 From: Camelia Groza <camelia.groza@nxp.com>
   3 Date: Tue, 19 Sep 2017 11:30:50 +0300
   4 Subject: [PATCH] sdk_dpaa: ls1043a errata: restrict the max mtu
   5
   6 We can not allow for Jumbo frames and large MTU values on LS1043A due to
   7 the A-010022 FMan errata. All outgoing frames larger than 4K bytes are dropped.
   8
   9 Signed-off-by: Camelia Groza <camelia.groza@nxp.com>
  10 ---
  11  drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_common.c | 11 ++++++++++-
  12  1 file changed, 10 insertions(+), 1 deletion(-)
  13
  14 --- a/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_common.c
  15 +++ b/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_common.c
  16 @@ -263,7 +263,16 @@ EXPORT_SYMBOL(dpa_get_stats64);
  17
  18  int dpa_change_mtu(struct net_device *net_dev, int new_mtu)
  19  {
  20 -       const int max_mtu = dpa_get_max_mtu();
  21 +       int max_mtu = dpa_get_max_mtu();
  22 +
  23 +#ifndef CONFIG_PPC
  24 +       /* Due to the A010022 FMan errata, we can not use contig frames larger
  25 +        * than 4K, nor S/G frames. We need to prevent the user from setting a
  26 +        * large MTU.
  27 +        */
  28 +       if (unlikely(dpaa_errata_a010022))
  29 +               max_mtu = DPA_BP_RAW_SIZE;
  30 +#endif
  31
  32         /* Make sure we don't exceed the Ethernet controller's MAXFRM */
  33         if (new_mtu < 68 || new_mtu > max_mtu) {