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crypto: hisilicon/qm - simplified the calculation of qos shaper parameters 

Some optimize for the calculation of qos shaper parameters.
and modify the comments.

Signed-off-by: Kai Ye <yekai13@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Kai Ye 2021-11-20 12:47:39 +08:00 committed by Herbert Xu
parent 488f30d4b8
commit 13389403fe
1 changed files with 55 additions and 29 deletions
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84
drivers/crypto/hisilicon/qm.c
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@ -501,10 +501,30 @@ static const char * const qp_s[] = {
"none", "init", "start", "stop", "close",
};
static const u32 typical_qos_val[QM_QOS_TYPICAL_NUM] = {100, 250, 500, 1000,
10000, 25000, 50000, 100000};
static const u32 typical_qos_cbs_s[QM_QOS_TYPICAL_NUM] = {9, 10, 11, 12, 16,
17, 18, 19};
struct qm_typical_qos_table {
u32 start;
u32 end;
u32 val;
};
/* the qos step is 100 */
static struct qm_typical_qos_table shaper_cir_s[] = {
{100, 100, 4},
{200, 200, 3},
{300, 500, 2},
{600, 1000, 1},
{1100, 100000, 0},
};
static struct qm_typical_qos_table shaper_cbs_s[] = {
{100, 200, 9},
{300, 500, 11},
{600, 1000, 12},
{1100, 10000, 16},
{10100, 25000, 17},
{25100, 50000, 18},
{50100, 100000, 19}
};
static bool qm_avail_state(struct hisi_qm *qm, enum qm_state new)
{
@ -988,12 +1008,14 @@ static void qm_init_prefetch(struct hisi_qm *qm)
}
/*
* acc_shaper_para_calc() Get the IR value by the qos formula, the return value
* is the expected qos calculated.
* the formula:
* IR = X Mbps if ir = 1 means IR = 100 Mbps, if ir = 10000 means = 10Gbps
*
* IR_b * (2 ^ IR_u) * 8
* IR(Mbps) * 10 ^ -3 = -------------------------
* Tick * (2 ^ IR_s)
* IR_b * (2 ^ IR_u) * 8000
* IR(Mbps) = -------------------------
* Tick * (2 ^ IR_s)
*/
static u32 acc_shaper_para_calc(u64 cir_b, u64 cir_u, u64 cir_s)
{
@ -1003,17 +1025,28 @@ static u32 acc_shaper_para_calc(u64 cir_b, u64 cir_u, u64 cir_s)
static u32 acc_shaper_calc_cbs_s(u32 ir)
{
int table_size = ARRAY_SIZE(shaper_cbs_s);
int i;
if (ir < typical_qos_val[0])
return QM_SHAPER_MIN_CBS_S;
for (i = 1; i < QM_QOS_TYPICAL_NUM; i++) {
if (ir >= typical_qos_val[i - 1] && ir < typical_qos_val[i])
return typical_qos_cbs_s[i - 1];
for (i = 0; i < table_size; i++) {
if (ir >= shaper_cbs_s[i].start && ir <= shaper_cbs_s[i].end)
return shaper_cbs_s[i].val;
}
return typical_qos_cbs_s[QM_QOS_TYPICAL_NUM - 1];
return QM_SHAPER_MIN_CBS_S;
}
static u32 acc_shaper_calc_cir_s(u32 ir)
{
int table_size = ARRAY_SIZE(shaper_cir_s);
int i;
for (i = 0; i < table_size; i++) {
if (ir >= shaper_cir_s[i].start && ir <= shaper_cir_s[i].end)
return shaper_cir_s[i].val;
}
return 0;
}
static int qm_get_shaper_para(u32 ir, struct qm_shaper_factor *factor)
@ -1022,25 +1055,18 @@ static int qm_get_shaper_para(u32 ir, struct qm_shaper_factor *factor)
u32 error_rate;
factor->cbs_s = acc_shaper_calc_cbs_s(ir);
cir_s = acc_shaper_calc_cir_s(ir);
for (cir_b = QM_QOS_MIN_CIR_B; cir_b <= QM_QOS_MAX_CIR_B; cir_b++) {
for (cir_u = 0; cir_u <= QM_QOS_MAX_CIR_U; cir_u++) {
for (cir_s = 0; cir_s <= QM_QOS_MAX_CIR_S; cir_s++) {
/** the formula is changed to:
* IR_b * (2 ^ IR_u) * DIVISOR_CLK
* IR(Mbps) = -------------------------
* 768 * (2 ^ IR_s)
*/
ir_calc = acc_shaper_para_calc(cir_b, cir_u,
cir_s);
error_rate = QM_QOS_EXPAND_RATE * (u32)abs(ir_calc - ir) / ir;
if (error_rate <= QM_QOS_MIN_ERROR_RATE) {
factor->cir_b = cir_b;
factor->cir_u = cir_u;
factor->cir_s = cir_s;
ir_calc = acc_shaper_para_calc(cir_b, cir_u, cir_s);
return 0;
}
error_rate = QM_QOS_EXPAND_RATE * (u32)abs(ir_calc - ir) / ir;
if (error_rate <= QM_QOS_MIN_ERROR_RATE) {
factor->cir_b = cir_b;
factor->cir_u = cir_u;
factor->cir_s = cir_s;
return 0;
}
}
}