From 684901a6df1fb91fc9a2bdb89ffbebb241428d78 Mon Sep 17 00:00:00 2001 From: Deepak Sikri Date: Sun, 8 Jul 2012 21:14:46 +0000 Subject: [PATCH] stmmac: Fix for higher mtu size handling For the higher mtu sizes requiring the buffer size greater than 8192, the buffers are sent or received using multiple dma descriptors/ same descriptor with option of multi buffer handling. It was observed during tests that the driver was missing on data packets during the normal ping operations if the data buffers being used catered to jumbo frame handling. The memory barrriers are added in between preparation of dma descriptors in the jumbo frame handling path to ensure all instructions before enabling the dma are complete. Signed-off-by: Deepak Sikri Signed-off-by: David S. Miller --- drivers/net/ethernet/stmicro/stmmac/ring_mode.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/ring_mode.c b/drivers/net/ethernet/stmicro/stmmac/ring_mode.c index fb8377da1687..4b785e10f2ed 100644 --- a/drivers/net/ethernet/stmicro/stmmac/ring_mode.c +++ b/drivers/net/ethernet/stmicro/stmmac/ring_mode.c @@ -51,7 +51,7 @@ static unsigned int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum) desc->des3 = desc->des2 + BUF_SIZE_4KiB; priv->hw->desc->prepare_tx_desc(desc, 1, bmax, csum); - + wmb(); entry = (++priv->cur_tx) % txsize; desc = priv->dma_tx + entry; @@ -59,6 +59,7 @@ static unsigned int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum) len, DMA_TO_DEVICE); desc->des3 = desc->des2 + BUF_SIZE_4KiB; priv->hw->desc->prepare_tx_desc(desc, 0, len, csum); + wmb(); priv->hw->desc->set_tx_owner(desc); priv->tx_skbuff[entry] = NULL; } else {