Merge branch 'ethtool-copybreak'

Guangbin Huang says:

====================
ethtool: add support to set/get tx copybreak buf size and rx buf len

This series add support to set/get tx copybreak buf size and rx buf len via
ethtool and hns3 driver implements them.

Tx copybreak buf size is used for tx copybreak feature which for small size
packet or frag. Use ethtool --get-tunable command to get it, and ethtool
--set-tunable command to set it, examples are as follow:

1. set tx spare buf size to 102400:
$ ethtool --set-tunable eth1 tx-buf-size 102400

2. get tx spare buf size:
$ ethtool --get-tunable eth1 tx-buf-size
tx-buf-size: 102400

Rx buf len is buffer length of each rx BD. Use ethtool -g command to get
it, and ethtool -G command to set it, examples are as follow:

1. set rx buf len to 4096
$ ethtool -G eth1 rx-buf-len 4096

2. get rx buf len
$ ethtool -g eth1
...
RX Buf Len:     4096

Change log:
V5 -> V6
1.Fix compile error for divers/s390.

V4 -> V5
1.Change struct ethtool_ringparam_ext to kernel_ethtool_ringparam.
2.change "__u32 rx_buf_len" to "u32 rx_buf_len".

V3 -> V4
1.Fix a few allmodconfig compile warning.
2.Add more '=' synbol to ethtool-netlink.rst to refine format.
3.Move definement of struct ethtool_ringparam_ext to include/linux/ethtool.h.
4.Move related modify of rings_fill_reply() from patch 4/6 to patch 3/6.

V2 -> V3
1.Remove documentation for tx copybreak buf size, there is description for
it in userspace ethtool.
2.Move extending parameters for get/set_ringparam function from patch3/6
to patch 4/6.

V1 -> V2
1.Add documentation for rx buf len and tx copybreak buf size.
2.Extend structure ringparam_ext for extenal ring params.
3.Change type of ETHTOOL_A_RINGS_RX_BUF_LEN from NLA_U32 to
  NLA_POLICY_MIN(NLA_U32, 1).
4.Add supported_ring_params in ethtool_ops to indicate if support external
  params.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 24 insertions, 2 deletions

diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 845a0ffc16ee..a26f37a27167 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -67,6 +67,22 @@ enum {
 	ETH_RSS_HASH_FUNCS_COUNT
 };
 
+/**
+ * struct kernel_ethtool_ringparam - RX/TX ring configuration
+ * @rx_buf_len: Current length of buffers on the rx ring.
+ */
+struct kernel_ethtool_ringparam {
+	u32	rx_buf_len;
+};
+
+/**
+ * enum ethtool_supported_ring_param - indicator caps for setting ring params
+ * @ETHTOOL_RING_USE_RX_BUF_LEN: capture for setting rx_buf_len
+ */
+enum ethtool_supported_ring_param {
+	ETHTOOL_RING_USE_RX_BUF_LEN = BIT(0),
+};
+
 #define __ETH_RSS_HASH_BIT(bit)	((u32)1 << (bit))
 #define __ETH_RSS_HASH(name)	__ETH_RSS_HASH_BIT(ETH_RSS_HASH_##name##_BIT)
 
@@ -432,6 +448,7 @@ struct ethtool_module_power_mode_params {
  * @cap_link_lanes_supported: indicates if the driver supports lanes
  *	parameter.
  * @supported_coalesce_params: supported types of interrupt coalescing.
+ * @supported_ring_params: supported ring params.
  * @get_drvinfo: Report driver/device information.  Should only set the
  *	@driver, @version, @fw_version and @bus_info fields.  If not
  *	implemented, the @driver and @bus_info fields will be filled in
@@ -613,6 +630,7 @@ struct ethtool_module_power_mode_params {
 struct ethtool_ops {
 	u32     cap_link_lanes_supported:1;
 	u32	supported_coalesce_params;
+	u32	supported_ring_params;
 	void	(*get_drvinfo)(struct net_device *, struct ethtool_drvinfo *);
 	int	(*get_regs_len)(struct net_device *);
 	void	(*get_regs)(struct net_device *, struct ethtool_regs *, void *);
@@ -638,9 +656,13 @@ struct ethtool_ops {
 				struct kernel_ethtool_coalesce *,
 				struct netlink_ext_ack *);
 	void	(*get_ringparam)(struct net_device *,
-				 struct ethtool_ringparam *);
+				 struct ethtool_ringparam *,
+				 struct kernel_ethtool_ringparam *,
+				 struct netlink_ext_ack *);
 	int	(*set_ringparam)(struct net_device *,
-				 struct ethtool_ringparam *);
+				 struct ethtool_ringparam *,
+				 struct kernel_ethtool_ringparam *,
+				 struct netlink_ext_ack *);
 	void	(*get_pause_stats)(struct net_device *dev,
 				   struct ethtool_pause_stats *pause_stats);
 	void	(*get_pauseparam)(struct net_device *,