package/kernel/mac80211/patches/351-0014-brcmfmac-use-ndev-needed_headroom-to-reserve-additio.patch

   1 From: Wright Feng <wright.feng@broadcom.com>
   2 Date: Fri, 3 Jun 2016 23:31:09 +0200
   3 Subject: [PATCH] brcmfmac: use ndev->needed_headroom to reserve additional
   4  header space
   5
   6 When using nmap tool with FMAC, the nmap packets were be dropped by kernel
   7 because the size was too short. The kernel message showed like
   8 "nmap: packet size is too short (42 <= 50)". It is caused by the packet
   9 length is shorter than ndev->hard_header_len. According to definition of
  10 LL_RESERVED_SPACE() and hard_header_len, we should use hard_header_len
  11 to reserve for L2 header, like ethernet header(ETH_HLEN) in our case and
  12 use needed_headroom for the additional headroom needed by hardware.
  13
  14 Reviewed-by: Arend Van Spriel <arend@broadcom.com>
  15 Signed-off-by: Wright Feng <wright.feng@broadcom.com>
  16 Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
  17 Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
  18 ---
  19
  20 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
  21 +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
  22 @@ -516,7 +516,7 @@ int brcmf_net_attach(struct brcmf_if *if
  23         /* set appropriate operations */
  24         ndev->netdev_ops = &brcmf_netdev_ops_pri;
  25
  26 -       ndev->hard_header_len += drvr->hdrlen;
  27 +       ndev->needed_headroom += drvr->hdrlen;
  28         ndev->ethtool_ops = &brcmf_ethtool_ops;
  29
  30         drvr->rxsz = ndev->mtu + ndev->hard_header_len +