lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:	Tue, 17 Jul 2007 10:20:58 -0700 (PDT)
From:	vinay ravuri <vinaynyc@...oo.com>
To:	netdev@...r.kernel.org
Subject: Socket Buffers and Memory Managment

Hi,

I am fairly new to linux socket buffers and have the
following questions!

I am working with a custom ethernet MAC that does not
allow me to specify a particular memory location for
the h/w to DMA the packet into (Rx side).  Instead, it
has a pool of fixed size buffers with some h/w
specific headers around each buffer that are managed
by h/w and will pick a free buffer and DMA the packet.
 It appears dev_alloc_skb() actually allocates the
physical memory and doesn't allow the user to specify
the skb.data to something specific to what I want
which is a problem for me.  First is my assumption
correct that I am cannot pick an arbitrary skb.data
location in struct sk_buff?  I want to avoid copying
the dma'ed data into a new socket buffer as it is
expense.  Is there any ways around this problem?

Also, if the h/w gives me a single packet in multiple
locations (i.e. non-contiguous chunks of memory), can
socket buffers handle chains of buffers?  I am looking
for a facility like mbuf's in netbsd where one can
chain multiple buffers together to make construct a
single packet.

Please e-mail me responses to vinay_nyc@...oo.com

Thanks,
Vinay


 
____________________________________________________________________________________
Bored stiff? Loosen up... 
Download and play hundreds of games for free on Yahoo! Games.
http://games.yahoo.com/games/front
-
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

Powered by blists - more mailing lists