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authorMichael S. Tsirkin <mst@redhat.com>2016-02-07 23:27:55 +0200
committerDavid S. Miller <davem@davemloft.net>2016-02-11 09:52:12 -0500
commit4456ed04ea44b800d691b18c14a68ec9894d2aca (patch)
treec29ff1cde178f4ea26f4648d30d6a5863d1eb089 /include/uapi/linux/ethtool.h
parent809dc75e9b82fcae9c3c48b4eec4708c005259f3 (diff)
ethtool: future-proof interface for speed extensions
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>
Diffstat (limited to 'include/uapi/linux/ethtool.h')
-rw-r--r--include/uapi/linux/ethtool.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
index 5e0940dcbfe8..4345f80a2e33 100644
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h
@@ -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