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ethtool: future-proof interface for speed extensions

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Many virtual and not quite virtual devices allow any speed to be set
through ethtool. In particular, this applies to the virtio-net devices.
Document this fact to make sure people don't assume the enum lists all
possible values.  Reserve values greater than INT_MAX for future
extension and to avoid conflict with SPEED_UNKNOWN.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael S. Tsirkin 2016-02-07 23:27:55 +02:00 committed by David S. Miller
parent 809dc75e9b
commit 4456ed04ea
1 changed files with 3 additions and 3 deletions
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6
include/uapi/linux/ethtool.h
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@ -31,7 +31,7 @@
* physical connectors and other link features that are
* advertised through autonegotiation or enabled for
* auto-detection.
* @speed: Low bits of the speed
* @speed: Low bits of the speed, 1Mb units, 0 to INT_MAX or SPEED_UNKNOWN
* @duplex: Duplex mode; one of %DUPLEX_*
* @port: Physical connector type; one of %PORT_*
* @phy_address: MDIO address of PHY (transceiver); 0 or 255 if not
@ -47,7 +47,7 @@
* obsoleted by &struct ethtool_coalesce. Read-only; deprecated.
* @maxrxpkt: Historically used to report RX IRQ coalescing; now
* obsoleted by &struct ethtool_coalesce. Read-only; deprecated.
* @speed_hi: High bits of the speed
* @speed_hi: High bits of the speed, 1Mb units, 0 to INT_MAX or SPEED_UNKNOWN
* @eth_tp_mdix: Ethernet twisted-pair MDI(-X) status; one of
* %ETH_TP_MDI_*. If the status is unknown or not applicable, the
* value will be %ETH_TP_MDI_INVALID. Read-only.
@ -1359,7 +1359,7 @@ enum ethtool_sfeatures_retval_bits {
* it was forced up into this mode or autonegotiated.
*/
/* The forced speed, 10Mb, 100Mb, gigabit, [2.5|5|10|20|25|40|50|56|100]GbE. */
/* The forced speed, in units of 1Mb. All values 0 to INT_MAX are legal. */
#define SPEED_10 10
#define SPEED_100 100
#define SPEED_1000 1000