[PATCH] net: macb: dma_sync_* receive buffers
From: Ladislav Michl <hidden>
Date: 2018-11-15 00:38:22
Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Receive buffers are properly synchronized only if Cadence is GEM. Fix it for MACB as well. Fixes: 86dc5259e25d (net: macb: no need for coherent memory for receive buffer) Signed-off-by: Ladislav Michl <redacted> --- Hi Sascha, I'm unsure this is proper fix, but works for me (as well as reverting 86dc5259e25d) drivers/net/macb.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/net/macb.c b/drivers/net/macb.c
index 1c5752d10..2bd5b62a4 100644
--- a/drivers/net/macb.c
+++ b/drivers/net/macb.c@@ -216,9 +216,11 @@ static int macb_recv(struct eth_device *edev) dev_dbg(macb->dev, "%s\n", __func__); for (;;) { + barrier(); if (!(macb->rx_ring[rx_tail].addr & MACB_BIT(RX_USED))) return -1; + barrier(); status = macb->rx_ring[rx_tail].ctrl; if (status & MACB_BIT(RX_SOF)) { if (rx_tail != macb->rx_tail)
@@ -229,6 +231,8 @@ static int macb_recv(struct eth_device *edev) if (status & MACB_BIT(RX_EOF)) { buffer = macb->rx_buffer + macb->rx_buffer_size * macb->rx_tail; length = MACB_BFEXT(RX_FRMLEN, status); + dma_sync_single_for_cpu((unsigned long)buffer, length, + DMA_FROM_DEVICE); if (wrapped) { unsigned int headlen, taillen;
@@ -237,12 +241,17 @@ static int macb_recv(struct eth_device *edev) taillen = length - headlen; memcpy((void *)NetRxPackets[0], buffer, headlen); + dma_sync_single_for_cpu((unsigned long)macb->rx_buffer, + taillen, DMA_FROM_DEVICE); memcpy((void *)NetRxPackets[0] + headlen, macb->rx_buffer, taillen); buffer = (void *)NetRxPackets[0]; } net_receive(edev, buffer, length); + dma_sync_single_for_device((unsigned long)buffer, length, + DMA_FROM_DEVICE); + barrier(); if (++rx_tail >= macb->rx_ring_size) rx_tail = 0; reclaim_rx_buffers(macb, rx_tail);
@@ -252,7 +261,6 @@ static int macb_recv(struct eth_device *edev) rx_tail = 0; } } - barrier(); } return 0;
--
2.19.1
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