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dpaa_eth: perform DMA unmapping before read 

DMA unmapping is required before accessing the HW provided timestamping
information.

Fixes: 4664856e9c ("dpaa_eth: add support for hardware timestamping")
Signed-off-by: Madalin Bucur <madalin.bucur@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Madalin Bucur 2019-10-31 16:37:49 +02:00 committed by David S. Miller
parent 8151ee88ba
commit c70fd3182c
1 changed files with 17 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
View File

@ -1591,18 +1591,6 @@ static struct sk_buff *dpaa_cleanup_tx_fd(const struct dpaa_priv *priv,
skbh = (struct sk_buff **)phys_to_virt(addr);
skb = *skbh;
if (priv->tx_tstamp && skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) {
memset(&shhwtstamps, 0, sizeof(shhwtstamps));
if (!fman_port_get_tstamp(priv->mac_dev->port[TX], (void *)skbh,
&ns)) {
shhwtstamps.hwtstamp = ns_to_ktime(ns);
skb_tstamp_tx(skb, &shhwtstamps);
} else {
dev_warn(dev, "fman_port_get_tstamp failed!\n");
}
}
if (unlikely(qm_fd_get_format(fd) == qm_fd_sg)) {
nr_frags = skb_shinfo(skb)->nr_frags;
dma_unmap_single(priv->tx_dma_dev, addr,
@ -1625,14 +1613,28 @@ static struct sk_buff *dpaa_cleanup_tx_fd(const struct dpaa_priv *priv,
dma_unmap_page(priv->tx_dma_dev, qm_sg_addr(&sgt[i]),
qm_sg_entry_get_len(&sgt[i]), dma_dir);
}
/* Free the page frag that we allocated on Tx */
skb_free_frag(phys_to_virt(addr));
} else {
dma_unmap_single(priv->tx_dma_dev, addr,
skb_tail_pointer(skb) - (u8 *)skbh, dma_dir);
}
/* DMA unmapping is required before accessing the HW provided info */
if (priv->tx_tstamp && skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) {
memset(&shhwtstamps, 0, sizeof(shhwtstamps));
if (!fman_port_get_tstamp(priv->mac_dev->port[TX], (void *)skbh,
&ns)) {
shhwtstamps.hwtstamp = ns_to_ktime(ns);
skb_tstamp_tx(skb, &shhwtstamps);
} else {
dev_warn(dev, "fman_port_get_tstamp failed!\n");
}
}
if (qm_fd_get_format(fd) == qm_fd_sg)
/* Free the page frag that we allocated on Tx */
skb_free_frag(phys_to_virt(addr));
return skb;
}