diff options
| -rw-r--r-- | include/linux/ethtool.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h index 6746dee5a3fd..6a8253d3fea8 100644 --- a/include/linux/ethtool.h +++ b/include/linux/ethtool.h @@ -15,6 +15,7 @@ #include <linux/bitmap.h> #include <linux/compat.h> +#include <linux/if_ether.h> #include <linux/netlink.h> #include <uapi/linux/ethtool.h> @@ -1002,6 +1003,47 @@ void ethtool_aggregate_rmon_stats(struct net_device *dev, struct ethtool_rmon_stats *rmon_stats); /** + * ethtool_mm_frag_size_add_to_min - Translate (standard) additional fragment + * size expressed as multiplier into (absolute) minimum fragment size + * value expressed in octets + * @val_add: Value of addFragSize multiplier + */ +static inline u32 ethtool_mm_frag_size_add_to_min(u32 val_add) +{ + return (ETH_ZLEN + ETH_FCS_LEN) * (1 + val_add) - ETH_FCS_LEN; +} + +/** + * ethtool_mm_frag_size_min_to_add - Translate (absolute) minimum fragment size + * expressed in octets into (standard) additional fragment size expressed + * as multiplier + * @val_min: Value of addFragSize variable in octets + * @val_add: Pointer where the standard addFragSize value is to be returned + * @extack: Netlink extended ack + * + * Translate a value in octets to one of 0, 1, 2, 3 according to the reverse + * application of the 802.3 formula 64 * (1 + addFragSize) - 4. To be called + * by drivers which do not support programming the minimum fragment size to a + * continuous range. Returns error on other fragment length values. + */ +static inline int ethtool_mm_frag_size_min_to_add(u32 val_min, u32 *val_add, + struct netlink_ext_ack *extack) +{ + u32 add_frag_size; + + for (add_frag_size = 0; add_frag_size < 4; add_frag_size++) { + if (ethtool_mm_frag_size_add_to_min(add_frag_size) == val_min) { + *val_add = add_frag_size; + return 0; + } + } + + NL_SET_ERR_MSG_MOD(extack, + "minFragSize required to be one of 60, 124, 188 or 252"); + return -EINVAL; +} + +/** * ethtool_sprintf - Write formatted string to ethtool string data * @data: Pointer to start of string to update * @fmt: Format of string to write |