Commit 5a6cd6de authored by Alan Brady's avatar Alan Brady Committed by Jeff Kirsher
Browse files

ethtool: add ethtool_intersect_link_masks 



This function provides a way to intersect two link masks together to
find the common ground between them.  For example in i40e, the driver
first generates link masks for what is supported by the PHY type.  The
driver then gets the link masks for what the NVM supports.  The
resulting intersection between them yields what can truly be supported.

Signed-off-by: default avatarAlan Brady <alan.brady@intel.com>
Tested-by: default avatarAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent 211b4c14

include/linux/ethtool.h

+10 −0
Original line number Diff line number Diff line
@@ -163,6 +163,16 @@ extern int 
__ethtool_get_link_ksettings(struct net_device *dev,

			     struct ethtool_link_ksettings *link_ksettings);



/**

 * ethtool_intersect_link_masks - Given two link masks, AND them together

 * @dst: first mask and where result is stored

 * @src: second mask to intersect with

 *

 * Given two link mode masks, AND them together and save the result in dst.

 */

void ethtool_intersect_link_masks(struct ethtool_link_ksettings *dst,

				  struct ethtool_link_ksettings *src);



void ethtool_convert_legacy_u32_to_link_mode(unsigned long *dst,

					     u32 legacy_u32);

net/core/ethtool.c

+16 −0
Original line number Diff line number Diff line
@@ -403,6 +403,22 @@ static int __ethtool_set_flags(struct net_device *dev, u32 data) 
	return 0;

}



/* Given two link masks, AND them together and save the result in dst. */

void ethtool_intersect_link_masks(struct ethtool_link_ksettings *dst,

				  struct ethtool_link_ksettings *src)

{

	unsigned int size = BITS_TO_LONGS(__ETHTOOL_LINK_MODE_MASK_NBITS);

	unsigned int idx = 0;



	for (; idx < size; idx++) {

		dst->link_modes.supported[idx] &=

			src->link_modes.supported[idx];

		dst->link_modes.advertising[idx] &=

			src->link_modes.advertising[idx];

	}

}

EXPORT_SYMBOL(ethtool_intersect_link_masks);



void ethtool_convert_legacy_u32_to_link_mode(unsigned long *dst,

					     u32 legacy_u32)

{

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