netdev - Re: [net-next PATCH 07/11] net: introduce napi_alloc_skb

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Date:	Wed, 3 Feb 2016 06:29:00 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
Cc:	kbuild-all@...org, netdev@...r.kernel.org,
	Christoph Lameter <cl@...ux.com>, tom@...bertland.com,
	Alexander Duyck <alexander.duyck@...il.com>,
	alexei.starovoitov@...il.com,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	ogerlitz@...lanox.com, gerlitz.or@...il.com
Subject: Re: [net-next PATCH 07/11] net: introduce napi_alloc_skb_hint() for
 more use-cases

Hi Jesper,

[auto build test WARNING on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Jesper-Dangaard-Brouer/net-mitigating-kmem_cache-slowpath-and-BoF-discussion-patches/20160203-051706
reproduce: make htmldocs

All warnings (new ones prefixed by >>):

   include/linux/skbuff.h:922: warning: No description found for parameter 'sk'
>> net/core/skbuff.c:482: warning: No description found for parameter 'bulk_hint'
   net/core/gen_stats.c:155: warning: No description found for parameter 'cpu'
   net/core/gen_estimator.c:212: warning: No description found for parameter 'cpu_bstats'
   net/core/gen_estimator.c:303: warning: No description found for parameter 'cpu_bstats'
   net/core/dev.c:6450: warning: No description found for parameter 'len'
   include/linux/netdevice.h:1321: warning: Enum value 'IFF_XMIT_DST_RELEASE_PERM' not described in enum 'netdev_priv_flags'
   include/linux/netdevice.h:1321: warning: Enum value 'IFF_IPVLAN_MASTER' not described in enum 'netdev_priv_flags'
   include/linux/netdevice.h:1321: warning: Enum value 'IFF_IPVLAN_SLAVE' not described in enum 'netdev_priv_flags'
   include/linux/netdevice.h:1826: warning: No description found for parameter 'ptype_all'
   include/linux/netdevice.h:1826: warning: No description found for parameter 'ptype_specific'

vim +/bulk_hint +482 net/core/skbuff.c

^1da177e Linus Torvalds         2005-04-16  466  
fd11a83d Alexander Duyck        2014-12-09  467  /**
fd11a83d Alexander Duyck        2014-12-09  468   *	__napi_alloc_skb - allocate skbuff for rx in a specific NAPI instance
fd11a83d Alexander Duyck        2014-12-09  469   *	@napi: napi instance this buffer was allocated for
d7499160 Masanari Iida          2015-08-24  470   *	@len: length to allocate
fd11a83d Alexander Duyck        2014-12-09  471   *	@gfp_mask: get_free_pages mask, passed to alloc_skb and alloc_pages
fd11a83d Alexander Duyck        2014-12-09  472   *
fd11a83d Alexander Duyck        2014-12-09  473   *	Allocate a new sk_buff for use in NAPI receive.  This buffer will
fd11a83d Alexander Duyck        2014-12-09  474   *	attempt to allocate the head from a special reserved region used
fd11a83d Alexander Duyck        2014-12-09  475   *	only for NAPI Rx allocation.  By doing this we can save several
fd11a83d Alexander Duyck        2014-12-09  476   *	CPU cycles by avoiding having to disable and re-enable IRQs.
fd11a83d Alexander Duyck        2014-12-09  477   *
fd11a83d Alexander Duyck        2014-12-09  478   *	%NULL is returned if there is no free memory.
fd11a83d Alexander Duyck        2014-12-09  479   */
9451980a Alexander Duyck        2015-05-06  480  struct sk_buff *__napi_alloc_skb(struct napi_struct *napi, unsigned int len,
c24f01ac Jesper Dangaard Brouer 2016-02-02  481  				 unsigned int bulk_hint, gfp_t gfp_mask)
fd11a83d Alexander Duyck        2014-12-09 @482  {
1ec46e92 Jesper Dangaard Brouer 2016-02-02  483  	struct napi_alloc_cache *nc = this_cpu_ptr(&napi_alloc_cache);
c24f01ac Jesper Dangaard Brouer 2016-02-02  484  	unsigned int bulk_sz = min(bulk_hint, NAPI_SKB_CACHE_SIZE);
fc755a89 Jesper Dangaard Brouer 2016-02-02  485  	struct skb_shared_info *shinfo;
fd11a83d Alexander Duyck        2014-12-09  486  	struct sk_buff *skb;
9451980a Alexander Duyck        2015-05-06  487  	void *data;
fd11a83d Alexander Duyck        2014-12-09  488  
9451980a Alexander Duyck        2015-05-06  489  	len += NET_SKB_PAD + NET_IP_ALIGN;
9451980a Alexander Duyck        2015-05-06  490  

:::::: The code at line 482 was first introduced by commit
:::::: fd11a83dd3630ec6a60f8a702446532c5c7e1991 net: Pull out core bits of __netdev_alloc_skb and add __napi_alloc_skb

:::::: TO: Alexander Duyck <alexander.h.duyck@...hat.com>
:::::: CC: David S. Miller <davem@...emloft.net>

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