netdev - Re: [PATCH] TX_RING and packet mmap

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Date:	Tue, 21 Apr 2009 23:00:51 +0200
From:	Johann Baudy <johann.baudy@...-log.net>
To:	Christoph Lameter <cl@...ux.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] TX_RING and packet mmap

> Duh. So I cannot concurrently operate with multiple threads on the
> structure.
Except if you can ensure that multiple threads will not use the same buffer.

> The kernel synchronizes with itself via the socket?
Not sure to understand?
Both below rules + cache/mem flushing synchronize User and Kernel spaces
TP_STATUS_KERNEL => TP_STATUS_SEND_REQUEST: only performed by user.
TP_STATUS_SENDING => TP_STATUS_KERNEL  only performed by kernel.
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