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ftgmac100: Cleanup rx checksum handling 

Read the descriptor field only once and check for IP header
checksum errors as well

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Benjamin Herrenschmidt 2017-04-06 11:02:46 +10:00 committed by David S. Miller
parent d72e01a043
commit 672021943c
1 changed files with 25 additions and 38 deletions
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59
drivers/net/ethernet/faraday/ftgmac100.c
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@ -352,31 +352,11 @@ static dma_addr_t ftgmac100_rxdes_get_dma_addr(struct ftgmac100_rxdes *rxdes)
return le32_to_cpu(rxdes->rxdes3);
}
static bool ftgmac100_rxdes_is_tcp(struct ftgmac100_rxdes *rxdes)
static inline bool ftgmac100_rxdes_csum_err(struct ftgmac100_rxdes *rxdes)
{
return (rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_PROT_MASK)) ==
cpu_to_le32(FTGMAC100_RXDES1_PROT_TCPIP);
}
static bool ftgmac100_rxdes_is_udp(struct ftgmac100_rxdes *rxdes)
{
return (rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_PROT_MASK)) ==
cpu_to_le32(FTGMAC100_RXDES1_PROT_UDPIP);
}
static bool ftgmac100_rxdes_tcpcs_err(struct ftgmac100_rxdes *rxdes)
{
return rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_TCP_CHKSUM_ERR);
}
static bool ftgmac100_rxdes_udpcs_err(struct ftgmac100_rxdes *rxdes)
{
return rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_UDP_CHKSUM_ERR);
}
static bool ftgmac100_rxdes_ipcs_err(struct ftgmac100_rxdes *rxdes)
{
return rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_IP_CHKSUM_ERR);
return !!(rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_TCP_CHKSUM_ERR |
FTGMAC100_RXDES1_UDP_CHKSUM_ERR |
FTGMAC100_RXDES1_IP_CHKSUM_ERR));
}
static inline struct page **ftgmac100_rxdes_page_slot(struct ftgmac100 *priv,
@ -486,11 +466,6 @@ static bool ftgmac100_rx_packet_error(struct ftgmac100 *priv,
netdev->stats.rx_crc_errors++;
error = true;
} else if (unlikely(ftgmac100_rxdes_ipcs_err(rxdes))) {
if (net_ratelimit())
netdev_info(netdev, "rx IP checksum err\n");
error = true;
}
if (unlikely(ftgmac100_rxdes_frame_too_long(rxdes))) {
@ -582,14 +557,23 @@ static bool ftgmac100_rx_packet(struct ftgmac100 *priv, int *processed)
if (unlikely(ftgmac100_rxdes_multicast(rxdes)))
netdev->stats.multicast++;
/*
* It seems that HW does checksum incorrectly with fragmented packets,
* so we are conservative here - if HW checksum error, let software do
* the checksum again.
/* If the HW found checksum errors, bounce it to software.
*
* If we didn't, we need to see if the packet was recognized
* by HW as one of the supported checksummed protocols before
* we accept the HW test results.
*/
if ((ftgmac100_rxdes_is_tcp(rxdes) && !ftgmac100_rxdes_tcpcs_err(rxdes)) ||
(ftgmac100_rxdes_is_udp(rxdes) && !ftgmac100_rxdes_udpcs_err(rxdes)))
if (netdev->features & NETIF_F_RXCSUM) {
__le32 csum_vlan = rxdes->rxdes1;
__le32 err_bits = cpu_to_le32(FTGMAC100_RXDES1_TCP_CHKSUM_ERR |
FTGMAC100_RXDES1_UDP_CHKSUM_ERR |
FTGMAC100_RXDES1_IP_CHKSUM_ERR);
if ((csum_vlan & err_bits) ||
!(csum_vlan & cpu_to_le32(FTGMAC100_RXDES1_PROT_MASK)))
skb->ip_summed = CHECKSUM_NONE;
else
skb->ip_summed = CHECKSUM_UNNECESSARY;
}
map = ftgmac100_rxdes_get_dma_addr(rxdes);
@ -621,6 +605,9 @@ static bool ftgmac100_rx_packet(struct ftgmac100 *priv, int *processed)
netdev->stats.rx_bytes += skb->len;
/* push packet to protocol stack */
if (skb->ip_summed == CHECKSUM_NONE)
netif_receive_skb(skb);
else
napi_gro_receive(&priv->napi, skb);
(*processed)++;
@ -1575,7 +1562,7 @@ static int ftgmac100_probe(struct platform_device *pdev)
* when NCSI is enabled on the interface. It doesn't work
* in that case.
*/
netdev->features = NETIF_F_IP_CSUM | NETIF_F_GRO;
netdev->features = NETIF_F_RXCSUM | NETIF_F_IP_CSUM | NETIF_F_GRO;
if (priv->use_ncsi &&
of_get_property(pdev->dev.of_node, "no-hw-checksum", NULL))
netdev->features &= ~NETIF_F_IP_CSUM;