linux/drivers/net/ethernet/marvell/octeontx2/nic/otx2_dcbnl.c

// SPDX-License-Identifier: GPL-2.0
/* Marvell RVU Ethernet driver
 *
 * Copyright (C) 2021 Marvell.
 *
 */

#include "otx2_common.h"

static int otx2_check_pfc_config(struct otx2_nic *pfvf)
{
	u8 tx_queues = pfvf->hw.tx_queues, prio;
	u8 pfc_en = pfvf->pfc_en;

	for (prio = 0; prio < NIX_PF_PFC_PRIO_MAX; prio++) {
		if ((pfc_en & (1 << prio)) &&
		    prio > tx_queues - 1) {
			dev_warn(pfvf->dev,
				 "Increase number of tx queues from %d to %d to support PFC.\n",
				 tx_queues, prio + 1);
			return -EINVAL;
		}
	}

	return 0;
}

int otx2_pfc_txschq_config(struct otx2_nic *pfvf)
{
	u8 pfc_en, pfc_bit_set;
	int prio, lvl, err;

	pfc_en = pfvf->pfc_en;
	for (prio = 0; prio < NIX_PF_PFC_PRIO_MAX; prio++) {
		pfc_bit_set = pfc_en & (1 << prio);

		/* Either PFC bit is not set
		 * or tx scheduler is not allocated for the priority
		 */
		if (!pfc_bit_set || !pfvf->pfc_alloc_status[prio])
			continue;

		/* configure the scheduler for the tls*/
		for (lvl = 0; lvl < NIX_TXSCH_LVL_CNT; lvl++) {
			err = otx2_txschq_config(pfvf, lvl, prio, true);
			if (err) {
				dev_err(pfvf->dev,
					"%s configure PFC tx schq for lvl:%d, prio:%d failed!\n",
					__func__, lvl, prio);
				return err;
			}
		}
	}

	return 0;
}

static int otx2_pfc_txschq_alloc_one(struct otx2_nic *pfvf, u8 prio)
{
	struct nix_txsch_alloc_req *req;
	struct nix_txsch_alloc_rsp *rsp;
	int lvl, rc;

	/* Get memory to put this msg */
	req = otx2_mbox_alloc_msg_nix_txsch_alloc(&pfvf->mbox);
	if (!req)
		return -ENOMEM;

	/* Request one schq per level upto max level as configured
	 * link config level. These rest of the scheduler can be
	 * same as hw.txschq_list.
	 */
	for (lvl = 0; lvl < pfvf->hw.txschq_link_cfg_lvl; lvl++)
		req->schq[lvl] = 1;

	rc = otx2_sync_mbox_msg(&pfvf->mbox);
	if (rc)
		return rc;

	rsp = (struct nix_txsch_alloc_rsp *)
	      otx2_mbox_get_rsp(&pfvf->mbox.mbox, 0, &req->hdr);
	if (IS_ERR(rsp))
		return PTR_ERR(rsp);

	/* Setup transmit scheduler list */
	for (lvl = 0; lvl < pfvf->hw.txschq_link_cfg_lvl; lvl++) {
		if (!rsp->schq[lvl])
			return -ENOSPC;

		pfvf->pfc_schq_list[lvl][prio] = rsp->schq_list[lvl][0];
	}

	/* Set the Tx schedulers for rest of the levels same as
	 * hw.txschq_list as those will be common for all.
	 */
	for (; lvl < NIX_TXSCH_LVL_CNT; lvl++)
		pfvf->pfc_schq_list[lvl][prio] = pfvf->hw.txschq_list[lvl][0];

	pfvf->pfc_alloc_status[prio] = true;
	return 0;
}

int otx2_pfc_txschq_alloc(struct otx2_nic *pfvf)
{
	u8 pfc_en = pfvf->pfc_en;
	u8 pfc_bit_set;
	int err, prio;

	for (prio = 0; prio < NIX_PF_PFC_PRIO_MAX; prio++) {
		pfc_bit_set = pfc_en & (1 << prio);

		if (!pfc_bit_set || pfvf->pfc_alloc_status[prio])
			continue;

		/* Add new scheduler to the priority */
		err = otx2_pfc_txschq_alloc_one(pfvf, prio);
		if (err) {
			dev_err(pfvf->dev, "%s failed to allocate PFC TX schedulers\n", __func__);
			return err;
		}
	}

	return 0;
}

static int otx2_pfc_txschq_stop_one(struct otx2_nic *pfvf, u8 prio)
{
	struct nix_txsch_free_req *free_req;

	mutex_lock(&pfvf->mbox.lock);
	/* free PFC TLx nodes */
	free_req = otx2_mbox_alloc_msg_nix_txsch_free(&pfvf->mbox);
	if (!free_req) {
		mutex_unlock(&pfvf->mbox.lock);
		return -ENOMEM;
	}

	free_req->flags = TXSCHQ_FREE_ALL;
	otx2_sync_mbox_msg(&pfvf->mbox);
	mutex_unlock(&pfvf->mbox.lock);

	pfvf->pfc_alloc_status[prio] = false;
	return 0;
}

static int otx2_pfc_update_sq_smq_mapping(struct otx2_nic *pfvf, int prio)
{
	struct nix_cn10k_aq_enq_req *cn10k_sq_aq;
	struct net_device *dev = pfvf->netdev;
	bool if_up = netif_running(dev);
	struct nix_aq_enq_req *sq_aq;

	if (if_up) {
		if (pfvf->pfc_alloc_status[prio])
			netif_tx_stop_all_queues(pfvf->netdev);
		else
			netif_tx_stop_queue(netdev_get_tx_queue(dev, prio));
	}

	if (test_bit(CN10K_LMTST, &pfvf->hw.cap_flag)) {
		cn10k_sq_aq = otx2_mbox_alloc_msg_nix_cn10k_aq_enq(&pfvf->mbox);
		if (!cn10k_sq_aq)
			return -ENOMEM;

		/* Fill AQ info */
		cn10k_sq_aq->qidx = prio;
		cn10k_sq_aq->ctype = NIX_AQ_CTYPE_SQ;
		cn10k_sq_aq->op = NIX_AQ_INSTOP_WRITE;

		/* Fill fields to update */
		cn10k_sq_aq->sq.ena = 1;
		cn10k_sq_aq->sq_mask.ena = 1;
		cn10k_sq_aq->sq_mask.smq = GENMASK(9, 0);
		cn10k_sq_aq->sq.smq = otx2_get_smq_idx(pfvf, prio);
	} else {
		sq_aq = otx2_mbox_alloc_msg_nix_aq_enq(&pfvf->mbox);
		if (!sq_aq)
			return -ENOMEM;

		/* Fill AQ info */
		sq_aq->qidx = prio;
		sq_aq->ctype = NIX_AQ_CTYPE_SQ;
		sq_aq->op = NIX_AQ_INSTOP_WRITE;

		/* Fill fields to update */
		sq_aq->sq.ena = 1;
		sq_aq->sq_mask.ena = 1;
		sq_aq->sq_mask.smq = GENMASK(8, 0);
		sq_aq->sq.smq = otx2_get_smq_idx(pfvf, prio);
	}

	otx2_sync_mbox_msg(&pfvf->mbox);

	if (if_up) {
		if (pfvf->pfc_alloc_status[prio])
			netif_tx_start_all_queues(pfvf->netdev);
		else
			netif_tx_start_queue(netdev_get_tx_queue(dev, prio));
	}

	return 0;
}

int otx2_pfc_txschq_update(struct otx2_nic *pfvf)
{
	bool if_up = netif_running(pfvf->netdev);
	u8 pfc_en = pfvf->pfc_en, pfc_bit_set;
	struct mbox *mbox = &pfvf->mbox;
	int err, prio;

	mutex_lock(&mbox->lock);
	for (prio = 0; prio < NIX_PF_PFC_PRIO_MAX; prio++) {
		pfc_bit_set = pfc_en & (1 << prio);

		/* tx scheduler was created but user wants to disable now */
		if (!pfc_bit_set && pfvf->pfc_alloc_status[prio]) {
			mutex_unlock(&mbox->lock);
			if (if_up)
				netif_tx_stop_all_queues(pfvf->netdev);

			otx2_smq_flush(pfvf, pfvf->pfc_schq_list[NIX_TXSCH_LVL_SMQ][prio]);
			if (if_up)
				netif_tx_start_all_queues(pfvf->netdev);

			/* delete the schq */
			err = otx2_pfc_txschq_stop_one(pfvf, prio);
			if (err) {
				dev_err(pfvf->dev,
					"%s failed to stop PFC tx schedulers for priority: %d\n",
					__func__, prio);
				return err;
			}

			mutex_lock(&mbox->lock);
			goto update_sq_smq_map;
		}

		/* Either PFC bit is not set
		 * or Tx scheduler is already mapped for the priority
		 */
		if (!pfc_bit_set || pfvf->pfc_alloc_status[prio])
			continue;

		/* Add new scheduler to the priority */
		err = otx2_pfc_txschq_alloc_one(pfvf, prio);
		if (err) {
			mutex_unlock(&mbox->lock);
			dev_err(pfvf->dev,
				"%s failed to allocate PFC tx schedulers for priority: %d\n",
				__func__, prio);
			return err;
		}

update_sq_smq_map:
		err = otx2_pfc_update_sq_smq_mapping(pfvf, prio);
		if (err) {
			mutex_unlock(&mbox->lock);
			dev_err(pfvf->dev, "%s failed PFC Tx schq sq:%d mapping", __func__, prio);
			return err;
		}
	}

	err = otx2_pfc_txschq_config(pfvf);
	mutex_unlock(&mbox->lock);
	if (err)
		return err;

	return 0;
}

int otx2_pfc_txschq_stop(struct otx2_nic *pfvf)
{
	u8 pfc_en, pfc_bit_set;
	int prio, err;

	pfc_en = pfvf->pfc_en;
	for (prio = 0; prio < NIX_PF_PFC_PRIO_MAX; prio++) {
		pfc_bit_set = pfc_en & (1 << prio);
		if (!pfc_bit_set || !pfvf->pfc_alloc_status[prio])
			continue;

		/* Delete the existing scheduler */
		err = otx2_pfc_txschq_stop_one(pfvf, prio);
		if (err) {
			dev_err(pfvf->dev, "%s failed to stop PFC TX schedulers\n", __func__);
			return err;
		}
	}

	return 0;
}

int otx2_config_priority_flow_ctrl(struct otx2_nic *pfvf)
{
	struct cgx_pfc_cfg *req;
	struct cgx_pfc_rsp *rsp;
	int err = 0;

	if (is_otx2_lbkvf(pfvf->pdev))
		return 0;

	mutex_lock(&pfvf->mbox.lock);
	req = otx2_mbox_alloc_msg_cgx_prio_flow_ctrl_cfg(&pfvf->mbox);
	if (!req) {
		err = -ENOMEM;
		goto unlock;
	}

	if (pfvf->pfc_en) {
		req->rx_pause = true;
		req->tx_pause = true;
	} else {
		req->rx_pause = false;
		req->tx_pause = false;
	}
	req->pfc_en = pfvf->pfc_en;

	if (!otx2_sync_mbox_msg(&pfvf->mbox)) {
		rsp = (struct cgx_pfc_rsp *)
		       otx2_mbox_get_rsp(&pfvf->mbox.mbox, 0, &req->hdr);
		if (req->rx_pause != rsp->rx_pause || req->tx_pause != rsp->tx_pause) {
			dev_warn(pfvf->dev,
				 "Failed to config PFC\n");
			err = -EPERM;
		}
	}
unlock:
	mutex_unlock(&pfvf->mbox.lock);
	return err;
}

void otx2_update_bpid_in_rqctx(struct otx2_nic *pfvf, int vlan_prio, int qidx,
			       bool pfc_enable)
{
	bool if_up = netif_running(pfvf->netdev);
	struct npa_aq_enq_req *npa_aq;
	struct nix_aq_enq_req *aq;
	int err = 0;

	if (pfvf->queue_to_pfc_map[qidx] && pfc_enable) {
		dev_warn(pfvf->dev,
			 "PFC enable not permitted as Priority %d already mapped to Queue %d\n",
			 pfvf->queue_to_pfc_map[qidx], qidx);
		return;
	}

	if (if_up) {
		netif_tx_stop_all_queues(pfvf->netdev);
		netif_carrier_off(pfvf->netdev);
	}

	pfvf->queue_to_pfc_map[qidx] = vlan_prio;

	aq = otx2_mbox_alloc_msg_nix_aq_enq(&pfvf->mbox);
	if (!aq) {
		err = -ENOMEM;
		goto out;
	}

	aq->cq.bpid = pfvf->bpid[vlan_prio];
	aq->cq_mask.bpid = GENMASK(8, 0);

	/* Fill AQ info */
	aq->qidx = qidx;
	aq->ctype = NIX_AQ_CTYPE_CQ;
	aq->op = NIX_AQ_INSTOP_WRITE;

	otx2_sync_mbox_msg(&pfvf->mbox);

	npa_aq = otx2_mbox_alloc_msg_npa_aq_enq(&pfvf->mbox);
	if (!npa_aq) {
		err = -ENOMEM;
		goto out;
	}
	npa_aq->aura.nix0_bpid = pfvf->bpid[vlan_prio];
	npa_aq->aura_mask.nix0_bpid = GENMASK(8, 0);

	/* Fill NPA AQ info */
	npa_aq->aura_id = qidx;
	npa_aq->ctype = NPA_AQ_CTYPE_AURA;
	npa_aq->op = NPA_AQ_INSTOP_WRITE;
	otx2_sync_mbox_msg(&pfvf->mbox);

out:
	if (if_up) {
		netif_carrier_on(pfvf->netdev);
		netif_tx_start_all_queues(pfvf->netdev);
	}

	if (err)
		dev_warn(pfvf->dev,
			 "Updating BPIDs in CQ and Aura contexts of RQ%d failed with err %d\n",
			 qidx, err);
}

static int otx2_dcbnl_ieee_getpfc(struct net_device *dev, struct ieee_pfc *pfc)
{
	struct otx2_nic *pfvf = netdev_priv(dev);

	pfc->pfc_cap = IEEE_8021QAZ_MAX_TCS;
	pfc->pfc_en = pfvf->pfc_en;

	return 0;
}

static int otx2_dcbnl_ieee_setpfc(struct net_device *dev, struct ieee_pfc *pfc)
{
	struct otx2_nic *pfvf = netdev_priv(dev);
	int err;

	/* Save PFC configuration to interface */
	pfvf->pfc_en = pfc->pfc_en;

	if (pfvf->hw.tx_queues >= NIX_PF_PFC_PRIO_MAX)
		goto process_pfc;

	/* Check if the PFC configuration can be
	 * supported by the tx queue configuration
	 */
	err = otx2_check_pfc_config(pfvf);
	if (err)
		return err;

process_pfc:
	err = otx2_config_priority_flow_ctrl(pfvf);
	if (err)
		return err;

	/* Request Per channel Bpids */
	if (pfc->pfc_en)
		otx2_nix_config_bp(pfvf, true);

	err = otx2_pfc_txschq_update(pfvf);
	if (err) {
		dev_err(pfvf->dev, "%s failed to update TX schedulers\n", __func__);
		return err;
	}

	return 0;
}

static u8 otx2_dcbnl_getdcbx(struct net_device __always_unused *dev)
{
	return DCB_CAP_DCBX_HOST | DCB_CAP_DCBX_VER_IEEE;
}

static u8 otx2_dcbnl_setdcbx(struct net_device __always_unused *dev, u8 mode)
{
	return (mode != (DCB_CAP_DCBX_HOST | DCB_CAP_DCBX_VER_IEEE)) ? 1 : 0;
}

static const struct dcbnl_rtnl_ops otx2_dcbnl_ops = {
	.ieee_getpfc	= otx2_dcbnl_ieee_getpfc,
	.ieee_setpfc	= otx2_dcbnl_ieee_setpfc,
	.getdcbx	= otx2_dcbnl_getdcbx,
	.setdcbx	= otx2_dcbnl_setdcbx,
};

int otx2_dcbnl_set_ops(struct net_device *dev)
{
	struct otx2_nic *pfvf = netdev_priv(dev);

	pfvf->queue_to_pfc_map = devm_kzalloc(pfvf->dev, pfvf->hw.rx_queues,
					      GFP_KERNEL);
	if (!pfvf->queue_to_pfc_map)
		return -ENOMEM;
	dev->dcbnl_ops = &otx2_dcbnl_ops;

	return 0;
}