From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Monjalon Subject: Re: [PATCH] librte_pmd_packet: add PMD for AF_PACKET-based virtual devices Date: Fri, 11 Jul 2014 15:26:39 +0200 Message-ID: <140509179.juH2PgJsn9@xps13> References: <1405024369-30058-1-git-send-email-linville@tuxdriver.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Cc: dev-VfR2kkLFssw@public.gmane.org To: "John W. Linville" Return-path: In-Reply-To: <1405024369-30058-1-git-send-email-linville-2XuSBdqkA4R54TAoqtyWWQ@public.gmane.org> List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces-VfR2kkLFssw@public.gmane.org Sender: "dev" 2014-07-10 16:32, John W. Linville: > This is a Linux-specific virtual PMD driver backed by an AF_PACKET > socket. This implementation uses mmap'ed ring buffers to limit copying > and user/kernel transitions. The PACKET_FANOUT_HASH behavior of > AF_PACKET is used for frame reception. In the current implementation, > Tx and Rx queues are always paired, and therefore are always equal > in number -- changing this would be a Simple Matter Of Programming. > > Interfaces of this type are created with a command line option like > "--vdev=eth_packet0,iface=...". There are a number of options availabe > as arguments: > > - Interface is chosen by "iface" (required) > - Number of queue pairs set by "qpairs" (optional, default: 16) > - AF_PACKET MMAP block size set by "blocksz" (optional, default: 4096) > - AF_PACKET MMAP frame size set by "framesz" (optional, default: 2048) > - AF_PACKET MMAP frame count set by "framecnt" (optional, default: 512) > > Signed-off-by: John W. Linville > --- > This PMD is intended to provide a means for using DPDK on a broad > range of hardware without hardware-specific PMDs and (hopefully) > with better performance than what PCAP offers in Linux. This might > be useful as a development platform for DPDK applications when > DPDK-supported hardware is expensive or unavailable. Thank you for this nice work. I think it would be well suited to host this PMD as an external one in order to make it work also with DPDK 1.7.0. -- Thomas