netdev - Re: [PATCH] TX_RING and packet mmap

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Message-ID: <7e0dd21a0904120423v4296898fl7ce82ec8c3e42d3a@mail.gmail.com>
Date:	Sun, 12 Apr 2009 13:23:30 +0200
From:	Johann Baudy <johann.baudy@...-log.net>
To:	Evgeniy Polyakov <zbr@...emap.net>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Patrick McHardy <kaber@...sh.net>, jamal <hadi@...erus.ca>
Subject: Re: [PATCH] TX_RING and packet mmap

Thanks Evgeniy,

> Page itself will live until destruction time, when skb is linearized
> page is freed, so your own destructor will find that given page is no
> longer used, and appropriate memory area can be overwritten.
Ok, so if my understanding is correct, fragment data is copied, frags
info (page, offset, size ...) of  skb_shinfo(skb) remain available and
skb->data_len is equal to 0 (to tag it as linear).
Then I can use address of skb_shinfo(n)->frags[0].page to derive my
header whatever sending path.
Is it correct?

Best regards,
Johann





-- 
Johann Baudy
johaahn@...il.com
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