netdev - Re: [PATCH] net: NEWEMAC: Support for Pause packets in EMAC driver

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Date:	Mon, 17 Mar 2008 08:08:35 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Stefan Roese <sr@...x.de>
CC:	netdev@...r.kernel.org, linuxppc-dev@...abs.org,
	benh@...nel.crashing.org, jwboyer@...ux.vnet.ibm.com
Subject: Re: [PATCH] net: NEWEMAC: Support for Pause packets in EMAC driver

Stefan Roese wrote:
> From: Pravin M. Bathija <pbathija@...c.com>
> 
> Problem Description and Fix
> ---------------------------
> When a pause packet(with destination as reserved Multicast address) is
> received by the EMAC hardware to control the flow of frames being
> transmitted by it, it is dropped by the hardware unless the reserved
> Multicast address is hashed in to the GAHT[1-4] registers. This code fix
> adds the default reserved multicast address to the GAHT[1-4] registers
> in the EMAC(s) present on the chip. The flow control with Pause packets
> will only work if the following register bits are programmed in EMAC:
> EMACx_MR1[APP] = 1
> EMACx_RMR[BAE] = 1
> EMACx_RMR[MAE] = 1
> 
> Behavior that may be observed in a running system
> -------------------------------------------------
> A host transferring data from a PPC based system may send a Pause packet
> to the PPC EMAC requesting it to slow down the flow of packets. If the
> default reserved multicast MAC address is not programmed into the
> GAHT[1-4] registers this Pause packet will be dropped by PPC EMAC and no
> Flow Control will be done.
> 
> Signed-off-by: Pravin M. Bathija <pbathija@...c.com>
> Signed-off-by: Stefan Roese <sr@...x.de>
> ---
>  drivers/net/ibm_newemac/core.c |    7 +++++++
>  1 files changed, 7 insertions(+), 0 deletions(-)

applied


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