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Commit 15cbc70e authored by Alexander Duyck's avatar Alexander Duyck Committed by Jeff Kirsher
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ixgbe: Simplify logic for getting traffic class from user priority 



This patch is meant to help simplify the logic for getting traffic classes
from user priorities. To do this I am adding a function named
ixgbe_dcb_get_tc_from_up that will go through the traffic classes in
reverse order in order to determine which traffic class contains a bit for
a given user priority.

Adding a declaration for this new function to the header so that
we have a centralized means for sorting out traffic classes belonging to
features such as FCoE.

Signed-off-by: default avatarAlexander Duyck <alexander.h.duyck@intel.com>
Tested-by: default avatarPhil Schmitt <phillip.j.schmitt@intel.com>
Tested-by: default avatarRoss Brattain <ross.b.brattain@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent 22a4cca2

drivers/net/ethernet/intel/ixgbe/ixgbe_dcb.c

+23 −7
Original line number Original line Diff line number Diff line
@@ -231,16 +231,32 @@ void ixgbe_dcb_unpack_prio(struct ixgbe_dcb_config *cfg, int direction, 
	}

	}

}

}





void ixgbe_dcb_unpack_map(struct ixgbe_dcb_config *cfg, int direction, u8 *map)

static u8 ixgbe_dcb_get_tc_from_up(struct ixgbe_dcb_config *cfg,

				   int direction, u8 up)

{

{

	int i, up;

	struct tc_configuration *tc_config = &cfg->tc_config[0];

	unsigned long bitmap;

	u8 prio_mask = 1 << up;

	u8 tc;





	for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {

	/*

		bitmap = cfg->tc_config[i].path[direction].up_to_tc_bitmap;

	 * Test for TCs 7 through 1 and report the first match we find.  If

		for_each_set_bit(up, &bitmap, MAX_USER_PRIORITY)

	 * we find no match we can assume that the TC is 0 since the TC must

			map[up] = i;

	 * be set for all user priorities

	 */

	for (tc = MAX_TRAFFIC_CLASS - 1; tc; tc--) {

		if (prio_mask & tc_config[tc].path[direction].up_to_tc_bitmap)

			break;

	}

	}



	return tc;

}



void ixgbe_dcb_unpack_map(struct ixgbe_dcb_config *cfg, int direction, u8 *map)

{

	u8 up;



	for (up = 0; up < MAX_USER_PRIORITY; up++)

		map[up] = ixgbe_dcb_get_tc_from_up(cfg, direction, up);

}

}





/**

/**