Merge branch 'ethtool-forced-speed'

Paul Greenwalt says:

====================
ethtool: Add link mode maps for forced speeds

The following patch set was initially a part of [1]. As the purpose of the
original series was to add the support of the new hardware to the intel ice
driver, the refactoring of advertised link modes mapping was extracted to a
new set.

The patch set adds a common mechanism for mapping Ethtool forced speeds
with Ethtool supported link modes, which can be used in drivers code.

[1] https://lore.kernel.org/netdev/20230823180633.2450617-1-pawel.chmielewski@intel.com

Changelog:
v4->v5:
Separated ethtool and qede changes into two patches, fixed indentation,
and moved ethtool_forced_speed_maps_init() from ioctl.c to ethtool.h

v3->v4:
Moved the macro for setting fields into the common header file

v2->v3:
Fixed whitespaces, added missing line at end of file

v1->v2:
Fixed formatting, typo, moved declaration of iterator to loop line.
====================

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

2 files changed, 52 insertions, 14 deletions

diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 62b61527bcc4..8e91e8b8a693 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -13,6 +13,7 @@
 #ifndef _LINUX_ETHTOOL_H
 #define _LINUX_ETHTOOL_H
 
+#include <linux/linkmode.h>
 #include <linux/bitmap.h>
 #include <linux/compat.h>
 #include <linux/if_ether.h>
@@ -1052,4 +1053,40 @@ static inline int ethtool_mm_frag_size_min_to_add(u32 val_min, u32 *val_add,
  * next string.
  */
 extern __printf(2, 3) void ethtool_sprintf(u8 **data, const char *fmt, ...);
+
+/* Link mode to forced speed capabilities maps */
+struct ethtool_forced_speed_map {
+	u32		speed;
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(caps);
+
+	const u32	*cap_arr;
+	u32		arr_size;
+};
+
+#define ETHTOOL_FORCED_SPEED_MAP(prefix, value)				\
+{									\
+	.speed		= SPEED_##value,				\
+	.cap_arr	= prefix##_##value,				\
+	.arr_size	= ARRAY_SIZE(prefix##_##value),			\
+}
+
+/**
+ * ethtool_forced_speed_maps_init
+ * @maps: Pointer to an array of Ethtool forced speed map
+ * @size: Array size
+ *
+ * Initialize an array of Ethtool forced speed map to Ethtool link modes. This
+ * should be called during driver module init.
+ */
+static inline void
+ethtool_forced_speed_maps_init(struct ethtool_forced_speed_map *maps, u32 size)
+{
+	for (u32 i = 0; i < size; i++) {
+		struct ethtool_forced_speed_map *map = &maps[i];
+
+		linkmode_set_bit_array(map->cap_arr, map->arr_size, map->caps);
+		map->cap_arr = NULL;
+		map->arr_size = 0;
+	}
+}
 #endif /* _LINUX_ETHTOOL_H */
diff --git a/include/linux/linkmode.h b/include/linux/linkmode.h
index 15e0e0209da4..cd38f89553e6 100644
--- a/include/linux/linkmode.h
+++ b/include/linux/linkmode.h
@@ -2,6 +2,21 @@
 #define __LINKMODE_H
 
 #include <linux/bitmap.h>
+
+static inline void linkmode_set_bit(int nr, volatile unsigned long *addr)
+{
+	__set_bit(nr, addr);
+}
+
+static inline void linkmode_set_bit_array(const int *array, int array_size,
+					  unsigned long *addr)
+{
+	int i;
+
+	for (i = 0; i < array_size; i++)
+		linkmode_set_bit(array[i], addr);
+}
+
 #include <linux/ethtool.h>
 #include <uapi/linux/ethtool.h>
 
@@ -38,20 +53,6 @@ static inline int linkmode_andnot(unsigned long *dst, const unsigned long *src1,
 	return bitmap_andnot(dst, src1, src2,  __ETHTOOL_LINK_MODE_MASK_NBITS);
 }
 
-static inline void linkmode_set_bit(int nr, volatile unsigned long *addr)
-{
-	__set_bit(nr, addr);
-}
-
-static inline void linkmode_set_bit_array(const int *array, int array_size,
-					  unsigned long *addr)
-{
-	int i;
-
-	for (i = 0; i < array_size; i++)
-		linkmode_set_bit(array[i], addr);
-}
-
 static inline void linkmode_clear_bit(int nr, volatile unsigned long *addr)
 {
 	__clear_bit(nr, addr);