[PATCH net-next 2/8] net: bcmgenet: enable NETIF_F_HW_CSUM feature

Doug Berger
2019-12-17T21:04:50Z

The GENET hardware should be capable of generating IP checksums
using the NETIF_F_HW_CSUM feature, so switch to using that feature
instead of the depricated NETIF_F_IP_CSUM and NETIF_F_IPV6_CSUM.

Signed-off-by: Doug Berger <opendmb@gmail.com>
---
drivers/net/ethernet/broadcom/genet/bcmgenet.c | 29 +++++++++++---------------
1 file changed, 12 insertions(+), 17 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index d9defb8b1e5f..cd07b3ad1d53 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -549,7 +549,7 @@ static int bcmgenet_set_tx_csum(struct net_device *dev,
tbuf_ctrl = bcmgenet_tbuf_ctrl_get(priv);
rbuf_ctrl = bcmgenet_rbuf_readl(priv, RBUF_CTRL);

- desc_64b_en = !!(wanted & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM));
+ desc_64b_en = !!(wanted & NETIF_F_HW_CSUM);

/* enable 64 bytes descriptor in both directions (RBUF and TBUF) */
if (desc_64b_en) {
@@ -574,7 +574,7 @@ static int bcmgenet_set_features(struct net_device *dev,
netdev_features_t wanted = dev->wanted_features;
int ret = 0;

- if (changed & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM))
+ if (changed & NETIF_F_HW_CSUM)
ret = bcmgenet_set_tx_csum(dev, wanted);
if (changed & (NETIF_F_RXCSUM))
ret = bcmgenet_set_rx_csum(dev, wanted);
@@ -1516,24 +1516,19 @@ static struct sk_buff *bcmgenet_put_tx_csum(struct net_device *dev,
ip_proto = ipv6_hdr(skb)->nexthdr;
break;
default:
- return skb;
+ /* don't use UDP flag */
+ ip_proto = 0;
+ break;
}

offset = skb_checksum_start_offset(skb) - sizeof(*status);
tx_csum_info = (offset << STATUS_TX_CSUM_START_SHIFT) |
- (offset + skb->csum_offset);
+ (offset + skb->csum_offset) |
+ STATUS_TX_CSUM_LV;

- /* Set the length valid bit for TCP and UDP and just set
- * the special UDP flag for IPv4, else just set to 0.
- */
- if (ip_proto == IPPROTO_TCP || ip_proto == IPPROTO_UDP) {
- tx_csum_info |= STATUS_TX_CSUM_LV;
- if (ip_proto == IPPROTO_UDP &&
- ip_ver == htons(ETH_P_IP))
- tx_csum_info |= STATUS_TX_CSUM_PROTO_UDP;
- } else {
- tx_csum_info = 0;
- }
+ /* Set the special UDP flag for UDP */
+ if (ip_proto == IPPROTO_UDP)
+ tx_csum_info |= STATUS_TX_CSUM_PROTO_UDP;

status->tx_csum_info = tx_csum_info;
}
@@ -3536,8 +3531,8 @@ static int bcmgenet_probe(struct platform_device *pdev)
priv->msg_enable = netif_msg_init(-1, GENET_MSG_DEFAULT);

/* Set hardware features */
- dev->hw_features |= NETIF_F_SG | NETIF_F_IP_CSUM |
- NETIF_F_IPV6_CSUM | NETIF_F_HIGHDMA | NETIF_F_RXCSUM;
+ dev->hw_features |= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_HW_CSUM |
+ NETIF_F_RXCSUM;

/* Request the WOL interrupt and advertise suspend if available */
priv->wol_irq_disabled = true;
--
2.7.4