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ixgbe: Simplify logic for getting traffic class from user priority

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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: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Alexander Duyck 2012-05-17 05:14:34 +00:00 committed by Jeff Kirsher
parent 22a4cca2f4
commit 15cbc70ea2
1 changed files with 23 additions and 7 deletions
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30
drivers/net/ethernet/intel/ixgbe/ixgbe_dcb.c
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@ -231,16 +231,32 @@ void ixgbe_dcb_unpack_prio(struct ixgbe_dcb_config *cfg, int direction,
}
}
static u8 ixgbe_dcb_get_tc_from_up(struct ixgbe_dcb_config *cfg,
int direction, u8 up)
{
struct tc_configuration *tc_config = &cfg->tc_config[0];
u8 prio_mask = 1 << up;
u8 tc;
/*
* Test for TCs 7 through 1 and report the first match we find. If
* we find no match we can assume that the TC is 0 since the TC must
* 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)
{
int i, up;
unsigned long bitmap;
u8 up;
for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
bitmap = cfg->tc_config[i].path[direction].up_to_tc_bitmap;
for_each_set_bit(up, &bitmap, MAX_USER_PRIORITY)
map[up] = i;
}
for (up = 0; up < MAX_USER_PRIORITY; up++)
map[up] = ixgbe_dcb_get_tc_from_up(cfg, direction, up);
}
/**