From: Ioana Ciornei ioana.ciornei@nxp.com
[ Upstream commit e12be9139cca26d689fe1a9257054b76752f725b ]
If xdp_do_redirect() fails, the calling driver should handle recycling or freeing of the page associated with the frame. The dpaa2-eth driver didn't do either of them and just incremented a counter. Fix this by trying to DMA map back the page and recycle it or, if the mapping fails, just free it.
Fixes: d678be1dc1ec ("dpaa2-eth: add XDP_REDIRECT support") Signed-off-by: Ioana Ciornei ioana.ciornei@nxp.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c index fb0bcd18ec0c1..f1c2b3c7f7e99 100644 --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c @@ -399,10 +399,20 @@ static u32 dpaa2_eth_run_xdp(struct dpaa2_eth_priv *priv, xdp.frame_sz = DPAA2_ETH_RX_BUF_RAW_SIZE;
err = xdp_do_redirect(priv->net_dev, &xdp, xdp_prog); - if (unlikely(err)) + if (unlikely(err)) { + addr = dma_map_page(priv->net_dev->dev.parent, + virt_to_page(vaddr), 0, + priv->rx_buf_size, DMA_BIDIRECTIONAL); + if (unlikely(dma_mapping_error(priv->net_dev->dev.parent, addr))) { + free_pages((unsigned long)vaddr, 0); + } else { + ch->buf_count++; + dpaa2_eth_xdp_release_buf(priv, ch, addr); + } ch->stats.xdp_drop++; - else + } else { ch->stats.xdp_redirect++; + } break; }