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authorBen Hutchings <bhutchings@solarflare.com>2012-01-03 12:04:51 +0000
committerDavid S. Miller <davem@davemloft.net>2012-01-04 14:09:10 -0500
commit55664f324c2a1a6386dc88492c5c94aa3d336b93 (patch)
treea1859e049a47b3bb207882e4b9db126987f2ead9 /include/linux/ethtool.h
parent3a73e49caa75928149ea54f570f8afb5f6f4774d (diff)
downloadop-kernel-dev-55664f324c2a1a6386dc88492c5c94aa3d336b93.zip
op-kernel-dev-55664f324c2a1a6386dc88492c5c94aa3d336b93.tar.gz
ethtool: Allow drivers to select RX NFC rule locations
Define special location values for RX NFC that request the driver to select the actual rule location. This allows for implementation on devices that use hash-based filter lookup, whereas currently the API is more suited to devices with TCAM lookup or linear search. In ethtool_set_rxnfc() and the compat wrapper ethtool_ioctl(), copy the structure back to user-space after insertion so that the actual location is returned. Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/ethtool.h')
-rw-r--r--include/linux/ethtool.h26
1 files changed, 24 insertions, 2 deletions
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index b38bf69..d901714 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -489,7 +489,10 @@ struct ethtool_rx_flow_spec {
* on return.
*
* For %ETHTOOL_GRXCLSRLCNT, @rule_cnt is set to the number of defined
- * rules on return.
+ * rules on return. If @data is non-zero on return then it is the
+ * size of the rule table, plus the flag %RX_CLS_LOC_SPECIAL if the
+ * driver supports any special location values. If that flag is not
+ * set in @data then special location values should not be used.
*
* For %ETHTOOL_GRXCLSRULE, @fs.@location specifies the location of an
* existing rule on entry and @fs contains the rule on return.
@@ -501,10 +504,23 @@ struct ethtool_rx_flow_spec {
* must use the second parameter to get_rxnfc() instead of @rule_locs.
*
* For %ETHTOOL_SRXCLSRLINS, @fs specifies the rule to add or update.
- * @fs.@location specifies the location to use and must not be ignored.
+ * @fs.@location either specifies the location to use or is a special
+ * location value with %RX_CLS_LOC_SPECIAL flag set. On return,
+ * @fs.@location is the actual rule location.
*
* For %ETHTOOL_SRXCLSRLDEL, @fs.@location specifies the location of an
* existing rule on entry.
+ *
+ * A driver supporting the special location values for
+ * %ETHTOOL_SRXCLSRLINS may add the rule at any suitable unused
+ * location, and may remove a rule at a later location (lower
+ * priority) that matches exactly the same set of flows. The special
+ * values are: %RX_CLS_LOC_ANY, selecting any location;
+ * %RX_CLS_LOC_FIRST, selecting the first suitable location (maximum
+ * priority); and %RX_CLS_LOC_LAST, selecting the last suitable
+ * location (minimum priority). Additional special values may be
+ * defined in future and drivers must return -%EINVAL for any
+ * unrecognised value.
*/
struct ethtool_rxnfc {
__u32 cmd;
@@ -1141,6 +1157,12 @@ struct ethtool_ops {
#define RX_CLS_FLOW_DISC 0xffffffffffffffffULL
+/* Special RX classification rule insert location values */
+#define RX_CLS_LOC_SPECIAL 0x80000000 /* flag */
+#define RX_CLS_LOC_ANY 0xffffffff
+#define RX_CLS_LOC_FIRST 0xfffffffe
+#define RX_CLS_LOC_LAST 0xfffffffd
+
/* Reset flags */
/* The reset() operation must clear the flags for the components which
* were actually reset. On successful return, the flags indicate the
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