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mvpp2: sync only the received frame 

In the RX path we always sync against the maximum frame size for that pool.
Do the DMA sync and the unmap separately, so we can only sync by the
size of the received frame.

Signed-off-by: Matteo Croce <mcroce@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Matteo Croce 2019-10-24 19:24:57 +02:00 committed by David S. Miller
parent 7f7183af44
commit e1921168bb
1 changed files with 7 additions and 2 deletions
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9
drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
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@ -2959,6 +2959,10 @@ static int mvpp2_rx(struct mvpp2_port *port, struct napi_struct *napi,
if (rx_status & MVPP2_RXD_ERR_SUMMARY)
goto err_drop_frame;
dma_sync_single_for_cpu(dev->dev.parent, dma_addr,
rx_bytes + MVPP2_MH_SIZE,
DMA_FROM_DEVICE);
if (bm_pool->frag_size > PAGE_SIZE)
frag_size = 0;
else
@ -2976,8 +2980,9 @@ static int mvpp2_rx(struct mvpp2_port *port, struct napi_struct *napi,
goto err_drop_frame;
}
dma_unmap_single(dev->dev.parent, dma_addr,
bm_pool->buf_size, DMA_FROM_DEVICE);
dma_unmap_single_attrs(dev->dev.parent, dma_addr,
bm_pool->buf_size, DMA_FROM_DEVICE,
DMA_ATTR_SKIP_CPU_SYNC);
rcvd_pkts++;
rcvd_bytes += rx_bytes;