Messages in this thread | | | Subject | Re: [PATCH 11/11] net: xilinx: Show csum in bootlog | From | Ben Hutchings <> | Date | Fri, 5 Oct 2012 14:51:02 +0100 |
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On Fri, 2012-10-05 at 11:35 +0200, Michal Simek wrote: > On 10/04/2012 09:15 PM, Ben Hutchings wrote: > > On Thu, 2012-10-04 at 20:14 +0200, Michal Simek wrote: > >> Just show current setting in bootlog. > > [...] > >> --- a/drivers/net/ethernet/xilinx/ll_temac_main.c > >> +++ b/drivers/net/ethernet/xilinx/ll_temac_main.c > >> @@ -1052,12 +1052,14 @@ static int __devinit temac_of_probe(struct platform_device *op) > >> /* Setup checksum offload, but default to off if not specified */ > >> lp->temac_features = 0; > >> p = (__be32 *)of_get_property(op->dev.of_node, "xlnx,txcsum", NULL); > >> + dev_info(&op->dev, "TX_CSUM %d\n", be32_to_cpup(p)); > >> if (p && be32_to_cpu(*p)) { > >> lp->temac_features |= TEMAC_FEATURE_TX_CSUM; > >> /* Can checksum TCP/UDP over IPv4. */ > >> ndev->features |= NETIF_F_IP_CSUM; > >> } > >> p = (__be32 *)of_get_property(op->dev.of_node, "xlnx,rxcsum", NULL); > >> + dev_info(&op->dev, "RX_CSUM %d\n", be32_to_cpup(p)); > > [...] > > > > Is there any particular reason you think this needs to be logged by > > default, rather than letting users run ethtool -k? I suggest using > > dev_dbg() instead. > > Ok. I have looked at it and there are missing some bits in ndev->features. > > Can you please check that my setting is correct? > > It is SG DMA ip/driver. > ndev->features = NETIF_F_FRAGLIST | NETIF_F_SG
NETIF_F_SG only; NETIF_F_FRAGLIST means you can handle skbs chained through the frag_list pointer.
> With two options for csum on RX/TX. They can be selected independently. > tx Partial csum over IPv4. -> NETIF_F_IP_CSUM > tx Full csum. -> NETIF_F_HW_CSUM
NETIF_F_IP_CSUM means you have hardware checksum generation for TCP/IPv4 and UDP/IPv4 only (XAE_FEATURE_FULL_TX_CSUM).
NETIF_F_HW_CSUM means you have generic TCP-style checksum generation using the csum_start and csum_offset fields of the skb (XAE_FEATURE_PARTIAL_TX_CSUM). By the way, you're actually testing XAE_FEATURE_PARTIAL_RX_CSUM in axienet_start_xmit()...
> rx Full csum -> NETIF_F_RXCSUM > > Is there any option to support partial csum?
There is no need to differentiate these in the device features. For TX the stack needs to know whether to use a software fallback before passing the skb to you, but on RX it looks at the ip_summed field of each skb you pass up.
Ben.
-- Ben Hutchings, Staff Engineer, Solarflare Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked.
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