net: fec: add dma_wmb to ensure correct descriptor values

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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>

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Shenwei Wang 2023-05-18 10:02:02 -05:00 • committed by David S. Miller

parent 3be5f6cd4a

commit 9025944fdd

1 changed files with 11 additions and 6 deletions

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17

drivers/net/ethernet/freescale/fec_main.c

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