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ethtool: Define and apply a default policy for RX flow hash indirection

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All drivers that support modification of the RX flow hash indirection
table initialise it in the same way: RX rings are assigned to table
entries in rotation.  Make that default policy explicit by having them
call a ethtool_rxfh_indir_default() function.

In the ethtool core, add support for a zero size value for
ETHTOOL_SRXFHINDIR, which resets the table to this default.

Partly-suggested-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Acked-by: Shreyas N Bhatewara <sbhatewara@vmware.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings
2011-12-15 13:56:49 +00:00
committed by David S. Miller
parent 7850f63f16
commit 278bc4296b
6 changed files with 47 additions and 20 deletions
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23
include/linux/ethtool.h
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@@ -543,10 +543,15 @@ struct compat_ethtool_rxnfc {
/**
* struct ethtool_rxfh_indir - command to get or set RX flow hash indirection
* @cmd: Specific command number - %ETHTOOL_GRXFHINDIR or %ETHTOOL_SRXFHINDIR
* @size: On entry, the array size of the user buffer, which may be zero
* for %ETHTOOL_GRXFHINDIR. On return from %ETHTOOL_GRXFHINDIR, the
* array size of the hardware indirection table.
* @size: On entry, the array size of the user buffer, which may be zero.
* On return from %ETHTOOL_GRXFHINDIR, the array size of the hardware
* indirection table.
* @ring_index: RX ring/queue index for each hash value
*
* For %ETHTOOL_GRXFHINDIR, a @size of zero means that only the size
* should be returned. For %ETHTOOL_SRXFHINDIR, a @size of zero means
* the table should be reset to default values. This last feature
* is not supported by the original implementations.
*/
struct ethtool_rxfh_indir {
__u32 cmd;
@@ -749,6 +754,18 @@ struct net_device;
/* Some generic methods drivers may use in their ethtool_ops */
u32 ethtool_op_get_link(struct net_device *dev);
/**
* ethtool_rxfh_indir_default - get default value for RX flow hash indirection
* @index: Index in RX flow hash indirection table
* @n_rx_rings: Number of RX rings to use
*
* This function provides the default policy for RX flow hash indirection.
*/
static inline u32 ethtool_rxfh_indir_default(u32 index, u32 n_rx_rings)
{
return index % n_rx_rings;
}
/**
* struct ethtool_ops - optional netdev operations
* @get_settings: Get various device settings including Ethernet link