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Date: Mon, 16 Jun 2008 22:39:19 +0200 From: Patrick McHardy <kaber@...sh.net> To: Amar Mudrankit <amar.mudrankit@...gic.com> CC: netdev@...r.kernel.org, rdreier@...co.com, general@...ts.openfabrics.org, poornima.kamath@...gic.com Subject: Re: [ofa-general] Re: [PATCH v4 14/14] QLogic VNIC: sysfs Documentation Amar Mudrankit wrote: >>> I was looking at latest release of iproute2, in which I could not >>> locate fill_xstats. Can you help me to locate this? >> ->fill_xstats is in the kernel, in iproute its ->print_xstats. > > I was looking at kernel code net/8021q/vlan_netlink.c on which I have > following queries: > > a. Is it a correct file in kernel I m referring to? Yes. > b. vlan_fill_info is a function to send parameters back to user > level. What is the role of skb as an argument to function? Is some > network operation expected? netlink is a (local) networking protocol, this is the message sent to userspace. > c. How exactly the kernel API ops->get_size comes into play? I guess > user prog should first get the size of parameters that will be > returned by driver before calling ops->fill_info. No, its used internally for skb allocation. It should return the size of all encapsulated netlink attributes that will be dumped by ->fill_info (in most cases, just a constant value). > d. Can somebody briefly introduce struct nlattr? It looks like all > parameters flow through this structure. Not much to say about it, nla_type contains the numerical attribute type, nla_len the length without padding. Data follows the attribute, followed by padding to a multiple of four. The netlink construction functions and macros from include/net/netlink.h take care of all of this for you. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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