target/linux/mediatek/patches-4.4/0069-net-mediatek-do-not-set-the-QID-field-in-the-TX-DMA-.patch

   1 From 4742349c1595d38b3e3b463e66cf21af4217c869 Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Thu, 7 Apr 2016 17:36:23 +0200
   4 Subject: [PATCH 069/102] net: mediatek: do not set the QID field in the TX
   5  DMA descriptors
   6
   7 The QID field gets set to the mac id. This made the DMA linked list queue
   8 the traffic of each MAC on a different internal queue. However during long
   9 term testing we found that this will cause traffic stalls as the multi
  10 queue setup requires a more complete initialisation which is not part of
  11 the upstream driver yet.
  12
  13 This patch removes the code setting the QID field, resulting in all
  14 traffic ending up in queue 0 which works without any special setup.
  15
  16 Signed-off-by: John Crispin <blogic@openwrt.org>
  17 ---
  18  drivers/net/ethernet/mediatek/mtk_eth_soc.c |    3 +--
  19  1 file changed, 1 insertion(+), 2 deletions(-)
  20
  21 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  22 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  23 @@ -603,8 +603,7 @@ static int mtk_tx_map(struct sk_buff *sk
  24                         WRITE_ONCE(txd->txd1, mapped_addr);
  25                         WRITE_ONCE(txd->txd3, (TX_DMA_SWC |
  26                                                TX_DMA_PLEN0(frag_map_size) |
  27 -                                              last_frag * TX_DMA_LS0) |
  28 -                                              mac->id);
  29 +                                              last_frag * TX_DMA_LS0));
  30                         WRITE_ONCE(txd->txd4, 0);
  31
  32                         tx_buf->skb = (struct sk_buff *)MTK_DMA_DUMMY_DESC;