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Commit 14596f7006297b67516e2b6a2b26bcb11fe08fb3

Authored by Ben Hutchings
Committed by David S. Miller
1 parent 5d531aaa64
Exists in master and in 6 other branches imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga, smarc-l5.0.0_1.0.0-ga

ethtool: Clarify use of size field for ETHTOOL_GRXFHINDIR 

In order to find out the device's RX flow hash table size, ethtool
initially uses ETHTOOL_GRXFHINDIR with a buffer size of zero.  This
must be supported, but it is not necessary to support any other user
buffer size less than the device table size.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Showing 1 changed file with 3 additions and 2 deletions Side-by-side Diff

include/linux/ethtool.h
Diff comments   View file @ 14596f7
... ... @@ -543,8 +543,9 @@
543 543 /**
544 544 * struct ethtool_rxfh_indir - command to get or set RX flow hash indirection
545 545 * @cmd: Specific command number - %ETHTOOL_GRXFHINDIR or %ETHTOOL_SRXFHINDIR
546   - * @size: On entry, the array size of the user buffer. On return from
547   - * %ETHTOOL_GRXFHINDIR, the array size of the hardware indirection table.
  546 + * @size: On entry, the array size of the user buffer, which may be zero
  547 + * for %ETHTOOL_GRXFHINDIR. On return from %ETHTOOL_GRXFHINDIR, the
  548 + * array size of the hardware indirection table.
548 549 * @ring_index: RX ring/queue index for each hash value
549 550 */
550 551 struct ethtool_rxfh_indir {