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dpaa_eth: enable Rx checksum offload 

Use the FMan HW parser L4CV flag to offload Rx checksumming.

Signed-off-by: Madalin Bucur <madalin.bucur@nxp.com>
This commit is contained in:
Madalin Bucur 2017-01-26 14:34:02 +02:00
parent 4529da5b7f
commit 5accb28241
1 changed files with 27 additions and 2 deletions
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29
drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
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@ -137,6 +137,13 @@ MODULE_PARM_DESC(tx_timeout, "The Tx timeout in ms");
/* L4 Type field: TCP */
#define FM_L4_PARSE_RESULT_TCP 0x20
/* FD status field indicating whether the FM Parser has attempted to validate
* the L4 csum of the frame.
* Note that having this bit set doesn't necessarily imply that the checksum
* is valid. One would have to check the parse results to find that out.
*/
#define FM_FD_STAT_L4CV 0x00000004
#define DPAA_SGT_MAX_ENTRIES 16 /* maximum number of entries in SG Table */
#define DPAA_BUFF_RELEASE_MAX 8 /* maximum number of buffers released at once */
@ -235,6 +242,7 @@ static int dpaa_netdev_init(struct net_device *net_dev,
* For conformity, we'll still declare GSO explicitly.
*/
net_dev->features |= NETIF_F_GSO;
net_dev->features |= NETIF_F_RXCSUM;
net_dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
/* we do not want shared skbs on TX */
@ -1526,6 +1534,23 @@ static struct sk_buff *dpaa_cleanup_tx_fd(const struct dpaa_priv *priv,
return skb;
}
static u8 rx_csum_offload(const struct dpaa_priv *priv, const struct qm_fd *fd)
{
/* The parser has run and performed L4 checksum validation.
* We know there were no parser errors (and implicitly no
* L4 csum error), otherwise we wouldn't be here.
*/
if ((priv->net_dev->features & NETIF_F_RXCSUM) &&
(be32_to_cpu(fd->status) & FM_FD_STAT_L4CV))
return CHECKSUM_UNNECESSARY;
/* We're here because either the parser didn't run or the L4 checksum
* was not verified. This may include the case of a UDP frame with
* checksum zero or an L4 proto other than TCP/UDP
*/
return CHECKSUM_NONE;
}
/* Build a linear skb around the received buffer.
* We are guaranteed there is enough room at the end of the data buffer to
* accommodate the shared info area of the skb.
@ -1556,7 +1581,7 @@ static struct sk_buff *contig_fd_to_skb(const struct dpaa_priv *priv,
skb_reserve(skb, fd_off);
skb_put(skb, qm_fd_get_length(fd));
skb->ip_summed = CHECKSUM_NONE;
skb->ip_summed = rx_csum_offload(priv, fd);
return skb;
@ -1616,7 +1641,7 @@ static struct sk_buff *sg_fd_to_skb(const struct dpaa_priv *priv,
if (WARN_ON(unlikely(!skb)))
goto free_buffers;
skb->ip_summed = CHECKSUM_NONE;
skb->ip_summed = rx_csum_offload(priv, fd);
/* Make sure forwarded skbs will have enough space
* on Tx, if extra headers are added.