target/linux/layerscape/patches-5.4/701-net-0035-sdk_dpaa-accept-frames-on-RX-even-if-larger-than-MTU.patch

   1 From ab1371fec54bdd16b5f6c56c76d817404c696d4b Mon Sep 17 00:00:00 2001
   2 From: Camelia Groza <camelia.groza@nxp.com>
   3 Date: Wed, 18 Oct 2017 16:38:30 +0300
   4 Subject: [PATCH] sdk_dpaa: accept frames on RX even if larger than MTU
   5
   6 Documentation/networking/netdevices.txt mentions that interfaces must
   7 be able to receive frames at least the size of the configured MTU. The
   8 behavior for received frames larger than the MTU is unspecified. We have
   9 been dropping these frames in software. Remove this behavior and accept
  10 them.
  11
  12 Signed-off-by: Camelia Groza <camelia.groza@nxp.com>
  13 ---
  14  drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth.h    | 11 -----------
  15  drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_sg.c | 11 -----------
  16  2 files changed, 22 deletions(-)
  17
  18 --- a/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth.h
  19 +++ b/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth.h
  20 @@ -514,17 +514,6 @@ dpa_fd_offset(const struct qm_fd *fd)
  21         return fd->offset;
  22  }
  23
  24 -/* Verifies if the skb length is below the interface MTU */
  25 -static inline int dpa_check_rx_mtu(struct sk_buff *skb, int mtu)
  26 -{
  27 -       if (unlikely(skb->len > mtu))
  28 -               if ((skb->protocol != htons(ETH_P_8021Q))
  29 -                               || (skb->len > mtu + 4))
  30 -                       return -1;
  31 -
  32 -       return 0;
  33 -}
  34 -
  35  static inline uint16_t dpa_get_headroom(struct dpa_buffer_layout_s *bl)
  36  {
  37         uint16_t headroom;
  38 --- a/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_sg.c
  39 +++ b/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_sg.c
  40 @@ -616,13 +616,6 @@ void __hot _dpa_rx(struct net_device *ne
  41         (*count_ptr)--;
  42         skb->protocol = eth_type_trans(skb, net_dev);
  43
  44 -       /* IP Reassembled frames are allowed to be larger than MTU */
  45 -       if (unlikely(dpa_check_rx_mtu(skb, net_dev->mtu) &&
  46 -               !(fd_status & FM_FD_IPR))) {
  47 -               percpu_stats->rx_dropped++;
  48 -               goto drop_bad_frame;
  49 -       }
  50 -
  51         skb_len = skb->len;
  52
  53  #ifdef CONFIG_FSL_DPAA_DBG_LOOP
  54 @@ -655,10 +648,6 @@ void __hot _dpa_rx(struct net_device *ne
  55  packet_dropped:
  56         return;
  57
  58 -drop_bad_frame:
  59 -       dev_kfree_skb(skb);
  60 -       return;
  61 -
  62  _release_frame:
  63         dpa_fd_release(net_dev, fd);
  64  }