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IB/hfi1: Move QOS decision logic into its own function

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The decision to use QOS affects other resource allocation.
Move the QOS decision logic into its own function so it can
be called by other interested parties.

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Dean Luick 2016-04-12 11:31:11 -07:00 committed by Doug Ledford
parent 372cc85a13
commit 4a818bedf7
1 changed files with 50 additions and 17 deletions
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67
drivers/staging/rdma/hfi1/chip.c
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@ -13466,6 +13466,50 @@ static void complete_rsm_map_table(struct hfi1_devdata *dd,
}
}
/* return the number of RSM map table entries that will be used for QOS */
static int qos_rmt_entries(struct hfi1_devdata *dd, unsigned int *mp,
unsigned int *np)
{
int i;
unsigned int m, n;
u8 max_by_vl = 0;
/* is QOS active at all? */
if (dd->n_krcv_queues <= MIN_KERNEL_KCTXTS ||
num_vls == 1 ||
krcvqsset <= 1)
goto no_qos;
/* determine bits for qpn */
for (i = 0; i < min_t(unsigned int, num_vls, krcvqsset); i++)
if (krcvqs[i] > max_by_vl)
max_by_vl = krcvqs[i];
if (max_by_vl > 32)
goto no_qos;
m = ilog2(__roundup_pow_of_two(max_by_vl));
/* determine bits for vl */
n = ilog2(__roundup_pow_of_two(num_vls));
/* reject if too much is used */
if ((m + n) > 7)
goto no_qos;
if (mp)
*mp = m;
if (np)
*np = n;
return 1 << (m + n);
no_qos:
if (mp)
*mp = 0;
if (np)
*np = 0;
return 0;
}
/**
* init_qos - init RX qos
* @dd - device data
@ -13482,33 +13526,22 @@ static void complete_rsm_map_table(struct hfi1_devdata *dd,
*/
static void init_qos(struct hfi1_devdata *dd, struct rsm_map_table *rmt)
{
u8 max_by_vl = 0;
unsigned qpns_per_vl, ctxt, i, qpn, n = 1, m;
unsigned int rmt_entries;
u64 reg;
/* validate */
if (!rmt ||
dd->n_krcv_queues <= MIN_KERNEL_KCTXTS ||
num_vls == 1 ||
krcvqsset <= 1)
if (!rmt)
goto bail;
for (i = 0; i < min_t(unsigned, num_vls, krcvqsset); i++)
if (krcvqs[i] > max_by_vl)
max_by_vl = krcvqs[i];
if (max_by_vl > 32)
goto bail;
qpns_per_vl = __roundup_pow_of_two(max_by_vl);
/* determine bits vl */
n = ilog2(__roundup_pow_of_two(num_vls));
/* determine bits for qpn */
m = ilog2(qpns_per_vl);
if ((m + n) > 7)
rmt_entries = qos_rmt_entries(dd, &m, &n);
if (rmt_entries == 0)
goto bail;
qpns_per_vl = 1 << m;
/* enough room in the map table? */
rmt_entries = 1 << (m + n);
if (rmt->used + rmt_entries >= NUM_MAP_ENTRIES)
goto bail;
/* add qos entries to the the RSM map table */
for (i = 0, ctxt = FIRST_KERNEL_KCTXT; i < num_vls; i++) {
unsigned tctxt;