From: Joe Perches <joe@perches.com>
To: David Daney <ddaney.cavm@gmail.com>
Cc: netdev@vger.kernel.org, "David S. Miller" <davem@davemloft.net>,
linux-mips@linux-mips.org, David Daney <david.daney@cavium.com>
Subject: Re: [PATCH 1/2] netdev: octeon_mgmt: Correct tx IFG workaround.
Date: Wed, 19 Jun 2013 18:08:07 -0700 [thread overview]
Message-ID: <1371690487.2146.5.camel@joe-AO722> (raw)
In-Reply-To: <1371688820-4585-2-git-send-email-ddaney.cavm@gmail.com>
On Wed, 2013-06-19 at 17:40 -0700, David Daney wrote:
> From: David Daney <david.daney@cavium.com>
>
> The previous fix was still too agressive to meet ieee specs. Increase
> to (14, 10).
[]
> diff --git a/drivers/net/ethernet/octeon/octeon_mgmt.c b/drivers/net/ethernet/octeon/octeon_mgmt.c
[]
> @@ -1141,10 +1141,13 @@ static int octeon_mgmt_open(struct net_device *netdev)
> /* For compensation state to lock. */
> ndelay(1040 * NS_PER_PHY_CLK);
>
> - /* Some Ethernet switches cannot handle standard
> - * Interframe Gap, increase to 16 bytes.
> + /* Default Interframe Gaps are too small. Recommended
> + * workaround is.
> + *
> + * AGL_GMX_TX_IFG[IFG1]=14
> + * AGL_GMX_TX_IFG[IFG2]=10
Why isn't the TX IFG just 96 bit times?
I'm also confused a bit here by the difference between the
bsd implementation and yours.
http://fxr.watson.org/fxr/source/contrib/octeon-sdk/cvmx-csr-typedefs.h?v=FREEBSD8
2628 * * Programming IFG1 and IFG2.
2629 *
2630 * For half-duplex systems that require IEEE 802.3 compatibility, IFG1 must
2631 * be in the range of 1-8, IFG2 must be in the range of 4-12, and the
2632 * IFG1+IFG2 sum must be 12.
2633 *
2634 * For full-duplex systems that require IEEE 802.3 compatibility, IFG1 must
2635 * be in the range of 1-11, IFG2 must be in the range of 1-11, and the
2636 * IFG1+IFG2 sum must be 12.
2637 *
2638 * For all other systems, IFG1 and IFG2 can be any value in the range of
2639 * 1-15. Allowing for a total possible IFG sum of 2-30.
2640 *
2641 * Additionally reset when both MIX0/1_CTL[RESET] are set to 1.
> */
> - cvmx_write_csr(CVMX_AGL_GMX_TX_IFG, 0x88);
> + cvmx_write_csr(CVMX_AGL_GMX_TX_IFG, 0xae);
> }
>
> octeon_mgmt_rx_fill_ring(netdev);
I don't have a datasheet. Is one available?
next prev parent reply other threads:[~2013-06-20 1:08 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-20 0:40 [PATCH 0/2] netdev: octeon_mgmt minor fixes David Daney
2013-06-20 0:40 ` [PATCH 1/2] netdev: octeon_mgmt: Correct tx IFG workaround David Daney
2013-06-20 1:08 ` Joe Perches [this message]
2013-06-20 1:28 ` David Daney
2013-06-20 1:37 ` Joe Perches
2013-06-20 1:47 ` David Daney
2013-06-20 0:40 ` [PATCH 2/2] netdev: octeon_mgmt: Fix structure layout for little-endian David Daney
2013-06-20 9:47 ` David Laight
2013-06-27 10:40 ` Ralf Baechle
2013-06-20 5:13 ` [PATCH 0/2] netdev: octeon_mgmt minor fixes David Miller
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