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ethtool: Note common alternate exit condition for interrupt coalescing

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Many implementations ignore the value of max_frames and do not
treat usecs == 0 as special.  Document this as deprecated.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings
2011-08-15 14:09:22 +00:00
committed by David S. Miller
parent acf42a2a57
commit a27fc96b03
1 changed files with 6 additions and 0 deletions
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6
include/linux/ethtool.h
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@ -173,6 +173,12 @@ struct ethtool_eeprom {
* would cause interrupts to never be generated. To disable * would cause interrupts to never be generated. To disable
* coalescing, set usecs = 0 and max_frames = 1. * coalescing, set usecs = 0 and max_frames = 1.
* *
* Some implementations ignore the value of max_frames and use the
* condition:
* time_since_first_completion >= usecs
* This is deprecated. Drivers for hardware that does not support
* counting completions should validate that max_frames == !rx_usecs.
*
* Adaptive RX/TX coalescing is an algorithm implemented by some * Adaptive RX/TX coalescing is an algorithm implemented by some
* drivers to improve latency under low packet rates and improve * drivers to improve latency under low packet rates and improve
* throughput under high packet rates. Some drivers only implement * throughput under high packet rates. Some drivers only implement