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Commit 5accb282 authored by Madalin Bucur's avatar Madalin Bucur
Browse files

dpaa_eth: enable Rx checksum offload 



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

Signed-off-by: default avatarMadalin Bucur <madalin.bucur@nxp.com>
parent 4529da5b

drivers/net/ethernet/freescale/dpaa/dpaa_eth.c

+27 −2
Original line number Diff line number Diff line
@@ -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.