lkml.org 
[lkml]   [2016]   [Jun]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH V2 09/11] net: mediatek: fix off by one in the TX ring allocation
Date
The TX ring setup has an off by one error causing it to not utilise all
descriptors. This has the side effect that we need to reset the next
pointer at runtime to make it work. Fix the off by one and remove the
code fixing the ring at runtime.

Signed-off-by: John Crispin <john@phrozen.org>
---
drivers/net/ethernet/mediatek/mtk_eth_soc.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 24714ab..6daf48b 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -903,7 +903,6 @@ static int mtk_poll_tx(struct mtk_eth *eth, int budget, bool *tx_again)
}
mtk_tx_unmap(eth->dev, tx_buf);

- ring->last_free->txd2 = next_cpu;
ring->last_free = desc;
atomic_inc(&ring->free_count);

@@ -1011,7 +1010,7 @@ static int mtk_tx_alloc(struct mtk_eth *eth)

atomic_set(&ring->free_count, MTK_DMA_SIZE - 2);
ring->next_free = &ring->dma[0];
- ring->last_free = &ring->dma[MTK_DMA_SIZE - 2];
+ ring->last_free = &ring->dma[MTK_DMA_SIZE - 1];
ring->thresh = MAX_SKB_FRAGS;

/* make sure that all changes to the dma ring are flushed before we
--
1.7.10.4
\
 
 \ /
  Last update: 2016-06-10 14:21    [W:0.877 / U:1.200 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site