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| author |   Ben Hutchings <bhutchings@solarflare.com> | 2014-01-23 14:35:48 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2014-01-23 13:40:51 -0800 |
| commit | d9317aea16ecec7694271ef11fb7791a0f0d9cc5 (patch) | |
| tree | 9c1905eeb0c2a503acefcacf9743192da030dc6a /drivers/net/ethernet/sfc/mdio_10g.c | |
| parent | Add Shradha Shah as the sfc driver maintainer. (diff) | |
| download | linux-dev-d9317aea16ecec7694271ef11fb7791a0f0d9cc5.tar.xz linux-dev-d9317aea16ecec7694271ef11fb7791a0f0d9cc5.zip | |
sfc: Use the correct maximum TX DMA ring size for SFC9100
As part of a workaround for a hardware erratum in the SFC9100 family
(SF bug 35388), the TX_DESC_UPD_DWORD register address is also used
for communicating with the event block, and only descriptor pointer
values < 2048 are valid.
If the TX DMA ring size is increased to 4096 descriptors (which the
firmware still allows) then we may write a descriptor pointer
value >= 2048, which has entirely different and undesirable effects!
Limit the TX DMA ring size correctly when this workaround is in
effect.
Fixes: 8127d661e77f ('sfc: Add support for Solarflare SFC9100 family')
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Shradha Shah <sshah@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/sfc/mdio_10g.c')
0 files changed, 0 insertions, 0 deletions