From 13389403fe8a978bfc0a866b6d598451feaca212 Mon Sep 17 00:00:00 2001 From: Kai Ye Date: Sat, 20 Nov 2021 12:47:39 +0800 Subject: 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 Signed-off-by: Herbert Xu --- drivers/crypto/hisilicon/qm.c | 84 ++++++++++++++++++++++++++++--------------- 1 file changed, 55 insertions(+), 29 deletions(-) (limited to 'drivers/crypto/hisilicon') diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c index be4e8597b452..ad706ccfe91a 100644 --- a/drivers/crypto/hisilicon/qm.c +++ b/drivers/crypto/hisilicon/qm.c @@ -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 = 0; i < table_size; i++) { + if (ir >= shaper_cbs_s[i].start && ir <= shaper_cbs_s[i].end) + return shaper_cbs_s[i].val; + } - 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]; + 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 typical_qos_cbs_s[QM_QOS_TYPICAL_NUM - 1]; + 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; - - return 0; - } + 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; + return 0; } } } -- cgit