From f044948d45ef54c286f6d7c966d11308bd0340f8 Mon Sep 17 00:00:00 2001 From: Hernan Vargas Date: Thu, 3 Nov 2022 20:08:53 -0700 Subject: [PATCH] baseband/acc100: detect deRM corner cases Add function to detect if de-ratematch pre-processing is recommended for SW corner cases. Some specific 5GUL FEC corner cases may cause unintended back pressure and in some cases a potential stability issue on the ACC100. The PMD can detect such code block configuration and issue an info message to the user. Signed-off-by: Hernan Vargas Reviewed-by: Maxime Coquelin --- drivers/baseband/acc/acc_common.h | 8 +++++ drivers/baseband/acc/rte_acc100_pmd.c | 48 ++++++++++++++++++++++++++- 2 files changed, 55 insertions(+), 1 deletion(-) diff --git a/drivers/baseband/acc/acc_common.h b/drivers/baseband/acc/acc_common.h index 5cfa2b64ba..c076dc72cc 100644 --- a/drivers/baseband/acc/acc_common.h +++ b/drivers/baseband/acc/acc_common.h @@ -123,6 +123,14 @@ #define ACC_HARQ_ALIGN_64B 64 #define ACC_MAX_ZC 384 +/* De-ratematch code rate limitation for recommended operation */ +#define ACC_LIM_03 2 /* 0.03 */ +#define ACC_LIM_09 6 /* 0.09 */ +#define ACC_LIM_14 9 /* 0.14 */ +#define ACC_LIM_21 14 /* 0.21 */ +#define ACC_LIM_31 20 /* 0.31 */ +#define ACC_MAX_E (128 * 1024 - 2) + /* Helper macro for logging */ #define rte_acc_log(level, fmt, ...) \ rte_log(RTE_LOG_ ## level, RTE_LOG_NOTICE, fmt "\n", \ diff --git a/drivers/baseband/acc/rte_acc100_pmd.c b/drivers/baseband/acc/rte_acc100_pmd.c index 31076d382f..96daef87bc 100644 --- a/drivers/baseband/acc/rte_acc100_pmd.c +++ b/drivers/baseband/acc/rte_acc100_pmd.c @@ -761,6 +761,14 @@ acc100_queue_setup(struct rte_bbdev *dev, uint16_t queue_id, ret = -ENOMEM; goto free_lb_out; } + q->derm_buffer = rte_zmalloc_socket(dev->device->driver->name, + RTE_BBDEV_TURBO_MAX_CB_SIZE * 10, + RTE_CACHE_LINE_SIZE, conf->socket); + if (q->derm_buffer == NULL) { + rte_bbdev_log(ERR, "Failed to allocate derm_buffer memory"); + ret = -ENOMEM; + goto free_companion_ring_addr; + } /* * Software queue ring wraps synchronously with the HW when it reaches @@ -781,7 +789,7 @@ acc100_queue_setup(struct rte_bbdev *dev, uint16_t queue_id, q_idx = acc100_find_free_queue_idx(dev, conf); if (q_idx == -1) { ret = -EINVAL; - goto free_companion_ring_addr; + goto free_derm_buffer; } q->qgrp_id = (q_idx >> ACC100_GRP_ID_SHIFT) & 0xF; @@ -809,6 +817,9 @@ acc100_queue_setup(struct rte_bbdev *dev, uint16_t queue_id, dev->data->queues[queue_id].queue_private = q; return 0; +free_derm_buffer: + rte_free(q->derm_buffer); + q->derm_buffer = NULL; free_companion_ring_addr: rte_free(q->companion_ring_addr); q->companion_ring_addr = NULL; @@ -894,6 +905,7 @@ acc100_queue_release(struct rte_bbdev *dev, uint16_t q_id) if (q != NULL) { /* Mark the Queue as un-assigned */ d->q_assigned_bit_map[q->qgrp_id] &= (~0ULL - (1 << (uint64_t) q->aq_id)); + rte_free(q->derm_buffer); rte_free(q->companion_ring_addr); rte_free(q->lb_in); rte_free(q->lb_out); @@ -3026,6 +3038,36 @@ harq_loopback(struct acc_queue *q, struct rte_bbdev_dec_op *op, return 1; } +/* Assess whether a work around is recommended for the deRM corner cases */ +static inline bool +derm_workaround_recommended(struct rte_bbdev_op_ldpc_dec *ldpc_dec, struct acc_queue *q) +{ + if (!is_acc100(q)) + return false; + int32_t e = ldpc_dec->cb_params.e; + int q_m = ldpc_dec->q_m; + int z_c = ldpc_dec->z_c; + int K = (ldpc_dec->basegraph == 1 ? ACC_K_ZC_1 : ACC_K_ZC_2) * z_c; + bool recommended = false; + + if (ldpc_dec->basegraph == 1) { + if ((q_m == 4) && (z_c >= 320) && (e * ACC_LIM_31 > K * 64)) + recommended = true; + else if ((e * ACC_LIM_21 > K * 64)) + recommended = true; + } else { + if (q_m <= 2) { + if ((z_c >= 208) && (e * ACC_LIM_09 > K * 64)) + recommended = true; + else if ((z_c < 208) && (e * ACC_LIM_03 > K * 64)) + recommended = true; + } else if (e * ACC_LIM_14 > K * 64) + recommended = true; + } + + return recommended; +} + /** Enqueue one decode operations for ACC100 device in CB mode */ static inline int enqueue_ldpc_dec_one_op_cb(struct acc_queue *q, struct rte_bbdev_dec_op *op, @@ -3083,6 +3125,10 @@ enqueue_ldpc_dec_one_op_cb(struct acc_queue *q, struct rte_bbdev_dec_op *op, } else { struct acc_fcw_ld *fcw; uint32_t seg_total_left; + + if (derm_workaround_recommended(&op->ldpc_dec, q)) + rte_bbdev_log(INFO, "Corner case may require deRM pre-processing"); + fcw = &desc->req.fcw_ld; q->d->fcw_ld_fill(op, fcw, harq_layout);