target/linux/layerscape/patches-5.4/701-net-0182-staging-dpaa2-evb-Update-MTU-update-procedure.patch

   1 From e9c0434a55a0ddf28b1e7868890eb7557b2c28f9 Mon Sep 17 00:00:00 2001
   2 From: Razvan Stefanescu <razvan.stefanescu@nxp.com>
   3 Date: Thu, 17 Aug 2017 19:47:22 +0300
   4 Subject: [PATCH] staging: dpaa2-evb: Update MTU update procedure
   5
   6 Set limits on the MTU to accommodate netdevice update. There is no need to
   7 check the limits before setting the new value.
   8
   9 Signed-off-by: Razvan Stefanescu <razvan.stefanescu@nxp.com>
  10 ---
  11  drivers/staging/fsl-dpaa2/evb/evb.c | 18 ++++++++----------
  12  1 file changed, 8 insertions(+), 10 deletions(-)
  13
  14 --- a/drivers/staging/fsl-dpaa2/evb/evb.c
  15 +++ b/drivers/staging/fsl-dpaa2/evb/evb.c
  16 @@ -53,9 +53,9 @@ static const char evb_drv_version[] = "0
  17  #define DPDMUX_MAX_IRQ_NUM                     2
  18
  19  /* MAX FRAME LENGTH (currently 10k) */
  20 -#define EVB_MAX_FRAME_LENGTH                   (10 * 1024)
  21 -/* MIN FRAME LENGTH (64 bytes + 4 bytes CRC) */
  22 -#define EVB_MIN_FRAME_LENGTH                   68
  23 +#define EVB_MAX_FRAME_LENGTH           (10 * 1024)
  24 +#define EVB_MAX_MTU                    (EVB_MAX_FRAME_LENGTH - VLAN_ETH_HLEN)
  25 +#define EVB_MIN_MTU                    68
  26
  27  struct evb_port_priv {
  28         struct net_device       *netdev;
  29 @@ -457,16 +457,10 @@ static int evb_change_mtu(struct net_dev
  30         if (port_priv->port_index > 0)
  31                 return -EPERM;
  32
  33 -       if (mtu < EVB_MIN_FRAME_LENGTH || mtu > EVB_MAX_FRAME_LENGTH) {
  34 -               netdev_err(netdev, "Invalid MTU %d. Valid range is: %d..%d\n",
  35 -                          mtu, EVB_MIN_FRAME_LENGTH, EVB_MAX_FRAME_LENGTH);
  36 -               return -EINVAL;
  37 -       }
  38 -
  39         err = dpdmux_set_max_frame_length(evb_priv->mc_io,
  40                                           0,
  41                                           evb_priv->mux_handle,
  42 -                                         (uint16_t)mtu);
  43 +                                         (uint16_t)(mtu + VLAN_ETH_HLEN));
  44
  45         if (unlikely(err)) {
  46                 netdev_err(netdev, "dpdmux_ul_set_max_frame_length err %d\n",
  47 @@ -1291,6 +1285,10 @@ static int evb_probe(struct fsl_mc_devic
  48
  49                         list_add(&port_priv->list, &priv->port_list);
  50                 } else {
  51 +                       /* Set MTU limits only on uplink */
  52 +                       port_netdev->min_mtu = EVB_MIN_MTU;
  53 +                       port_netdev->max_mtu = EVB_MAX_MTU;
  54 +
  55                         err = register_netdev(netdev);
  56
  57                         if (err < 0) {