From mboxrd@z Thu Jan  1 00:00:00 1970
From: michi1@michaelblizek.twilightparadox.com (michi1 at michaelblizek.twilightparadox.com)
Date: Thu, 4 Apr 2013 19:26:42 +0200
Subject: Can anyone plz explain me the fields
In-Reply-To: <CAALD5izPo0uK9OykZy0SfQjs24GGDDkuopvtJA6OKPhHW1hNFA@mail.gmail.com>
References: <CAALD5izPo0uK9OykZy0SfQjs24GGDDkuopvtJA6OKPhHW1hNFA@mail.gmail.com>
Message-ID: <20130404172642.GC2256@grml>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

Hi!

On 17:38 Thu 04 Apr     , Tarun Batra wrote:
> Can anyone plz explain me the fields
> 
> 
>  skb = kmem_cache_alloc(skbuff_head_cache, gfp_mask & ~_ _GFP_DMA);
>     ... ... ...
>     size = SKB_DATA_ALIGN(size);

size of data buffer (the bytes you send over the wire not the overhead of
everything you need in ram to process the packets)

>     data = kmalloc(size + sizeof(struct skb_shared_info), gfp_mask);

data is the actual buffer (+skb_shared_info at the end of it)

	-Michi
-- 
programing a layer 3+4 network protocol for mesh networks
see http://michaelblizek.twilightparadox.com