[net-next,v0,3/5] net: add fdb generic dump routine

This adds a generic dump routine drivers can call. It
should be sufficient to handle any bridging model that
uses the unicast address list. This should be most SR-IOV
enabled NICs.

Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
---

 net/core/rtnetlink.c |   56 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 56 insertions(+), 0 deletions(-)


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On 3/18/12 11:52 PM, "John Fastabend" <john.r.fastabend@intel.com> wrote:

> This adds a generic dump routine drivers can call. It
> should be sufficient to handle any bridging model that
> uses the unicast address list. This should be most SR-IOV
> enabled NICs.
> 
> Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
> ---
> 
>  net/core/rtnetlink.c |   56
> ++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 56 insertions(+), 0 deletions(-)
> 
> diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
> index 8c3278a..35ee2d6 100644
> --- a/net/core/rtnetlink.c
> +++ b/net/core/rtnetlink.c
> @@ -2082,6 +2082,62 @@ static int rtnl_fdb_del(struct sk_buff *skb, struct
> nlmsghdr *nlh, void *arg)
> return err;
>  }
>  
> +/**
> + * ndo_dflt_fdb_dump: default netdevice operation to dump an FDB table.
> + * @nlh: netlink message header
> + * @dev: netdevice
> + *
> + * Default netdevice operation to dump the existing unicast address list.
> + * Returns zero on success.
> + */
> +int ndo_dflt_fdb_dump(struct sk_buff *skb,
> +        struct netlink_callback *cb,
> +        struct net_device *dev,
> +        int idx)
> +{
> + struct netdev_hw_addr *ha;
> + struct nlmsghdr *nlh;
> + struct ndmsg *ndm;
> + u32 pid, seq;
> +
> + pid = NETLINK_CB(cb->skb).pid;
> + seq = cb->nlh->nlmsg_seq;
> +
> + netif_addr_lock_bh(dev);
> + list_for_each_entry(ha, &dev->uc.list, list) {
> +  if (idx < cb->args[0])
> +   goto skip;

Any reason why its only uc ?. What about mc ?

> +
> +  nlh = nlmsg_put(skb, pid, seq,
> +    RTM_NEWNEIGH, sizeof(*ndm), NLM_F_MULTI);
> +  if (!nlh)
> +   break;
> +
> +  ndm = nlmsg_data(nlh);
> +  ndm->ndm_family  = AF_BRIDGE;
> +  ndm->ndm_pad1  = 0;
> +  ndm->ndm_pad2    = 0;
> +  ndm->ndm_flags  = NTF_LOWERDEV;
> +  ndm->ndm_type  = 0;
> +  ndm->ndm_ifindex = dev->ifindex;
> +  ndm->ndm_state   = NUD_PERMANENT;
> +
> +  NLA_PUT(skb, NDA_LLADDR, ETH_ALEN, ha->addr);
> +
> +  nlmsg_end(skb, nlh);
> +skip:
> +  ++idx;
> + }
> + netif_addr_unlock_bh(dev);
> +
> + return idx;
> +nla_put_failure:
> + netif_addr_unlock_bh(dev);
> + nlmsg_cancel(skb, nlh);
> + return idx;
> +}
> +EXPORT_SYMBOL(ndo_dflt_fdb_dump);
> +
>  static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
>  {
> int idx = 0;
> 

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On 3/25/2012 6:09 AM, Roopa Prabhu wrote:
> 
> 
> 
> On 3/18/12 11:52 PM, "John Fastabend" <john.r.fastabend@intel.com> wrote:
> 
>> This adds a generic dump routine drivers can call. It
>> should be sufficient to handle any bridging model that
>> uses the unicast address list. This should be most SR-IOV
>> enabled NICs.
>>
>> Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
>> ---
>>

[...]

>> +/**
>> + * ndo_dflt_fdb_dump: default netdevice operation to dump an FDB table.
>> + * @nlh: netlink message header
>> + * @dev: netdevice
>> + *
>> + * Default netdevice operation to dump the existing unicast address list.
>> + * Returns zero on success.
>> + */
>> +int ndo_dflt_fdb_dump(struct sk_buff *skb,
>> +        struct netlink_callback *cb,
>> +        struct net_device *dev,
>> +        int idx)
>> +{
>> + struct netdev_hw_addr *ha;
>> + struct nlmsghdr *nlh;
>> + struct ndmsg *ndm;
>> + u32 pid, seq;
>> +
>> + pid = NETLINK_CB(cb->skb).pid;
>> + seq = cb->nlh->nlmsg_seq;
>> +
>> + netif_addr_lock_bh(dev);
>> + list_for_each_entry(ha, &dev->uc.list, list) {
>> +  if (idx < cb->args[0])
>> +   goto skip;
> 
> Any reason why its only uc ?. What about mc ?

Sure this might be useful to know for embedded devices
and likely more useful for the macvlan driver. I'll add
it in the next version.

Thanks,
John


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