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ethtool: provide ring sizes with RINGS_GET request

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Implement RINGS_GET request to get ring sizes of a network device. These
are traditionally available via ETHTOOL_GRINGPARAM ioctl request.

Omit attributes for ring types which are not supported by driver or device
(zero reported for maximum).

v2: (all suggested by Jakub Kicinski)
  - minor cleanup in rings_prepare_data()
  - more descriptive rings_reply_size()
  - omit attributes with zero max size

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michal Kubecek
2020-03-12 21:08:23 +01:00
committed by David S. Miller
parent 111dcba3c6
commit e4a1717b67
6 changed files with 168 additions and 2 deletions
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21
include/uapi/linux/ethtool_netlink.h
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@@ -28,6 +28,7 @@ enum {
ETHTOOL_MSG_FEATURES_SET,
ETHTOOL_MSG_PRIVFLAGS_GET,
ETHTOOL_MSG_PRIVFLAGS_SET,
ETHTOOL_MSG_RINGS_GET,
/* add new constants above here */
__ETHTOOL_MSG_USER_CNT,
@@ -52,6 +53,7 @@ enum {
ETHTOOL_MSG_FEATURES_NTF,
ETHTOOL_MSG_PRIVFLAGS_GET_REPLY,
ETHTOOL_MSG_PRIVFLAGS_NTF,
ETHTOOL_MSG_RINGS_GET_REPLY,
/* add new constants above here */
__ETHTOOL_MSG_KERNEL_CNT,
@@ -264,6 +266,25 @@ enum {
ETHTOOL_A_PRIVFLAGS_MAX = __ETHTOOL_A_PRIVFLAGS_CNT - 1
};
/* RINGS */
enum {
ETHTOOL_A_RINGS_UNSPEC,
ETHTOOL_A_RINGS_HEADER, /* nest - _A_HEADER_* */
ETHTOOL_A_RINGS_RX_MAX, /* u32 */
ETHTOOL_A_RINGS_RX_MINI_MAX, /* u32 */
ETHTOOL_A_RINGS_RX_JUMBO_MAX, /* u32 */
ETHTOOL_A_RINGS_TX_MAX, /* u32 */
ETHTOOL_A_RINGS_RX, /* u32 */
ETHTOOL_A_RINGS_RX_MINI, /* u32 */
ETHTOOL_A_RINGS_RX_JUMBO, /* u32 */
ETHTOOL_A_RINGS_TX, /* u32 */
/* add new constants above here */
__ETHTOOL_A_RINGS_CNT,
ETHTOOL_A_RINGS_MAX = (__ETHTOOL_A_RINGS_CNT - 1)
};
/* generic netlink info */
#define ETHTOOL_GENL_NAME "ethtool"
#define ETHTOOL_GENL_VERSION 1