Shenwei Wang
9025944fdd
net: fec: add dma_wmb to ensure correct descriptor values
...
Two dma_wmb() are added in the XDP TX path to ensure proper ordering of
descriptor and buffer updates:
1. A dma_wmb() is added after updating the last BD to make sure
the updates to rest of the descriptor are visible before
transferring ownership to FEC.
2. A dma_wmb() is also added after updating the bdp to ensure these
updates are visible before updating txq->bd.cur.
3. Start the xmit of the frame immediately right after configuring the
tx descriptor.
Fixes: 6d6b39f180 ("net: fec: add initial XDP support")
Signed-off-by: Shenwei Wang <shenwei.wang@nxp.com >
Reviewed-by: Wei Fang <wei.fang@nxp.com >
Signed-off-by: David S. Miller <davem@davemloft.net >
2023-05-19 09:17:53 +01:00
..
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