xgbe-dcb.c

  1// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-3-Clause)
  2/*
  3 * Copyright (c) 2014-2025, Advanced Micro Devices, Inc.
  4 * Copyright (c) 2014, Synopsys, Inc.
  5 * All rights reserved
  6 */
  7
  8#include <linux/netdevice.h>
  9#include <net/dcbnl.h>
 10
 11#include "xgbe.h"
 12#include "xgbe-common.h"
 13
 14static int xgbe_dcb_ieee_getets(struct net_device *netdev,
 15				struct ieee_ets *ets)
 16{
 17	struct xgbe_prv_data *pdata = netdev_priv(netdev);
 18
 19	/* Set number of supported traffic classes */
 20	ets->ets_cap = pdata->hw_feat.tc_cnt;
 21
 22	if (pdata->ets) {
 23		ets->cbs = pdata->ets->cbs;
 24		memcpy(ets->tc_tx_bw, pdata->ets->tc_tx_bw,
 25		       sizeof(ets->tc_tx_bw));
 26		memcpy(ets->tc_tsa, pdata->ets->tc_tsa,
 27		       sizeof(ets->tc_tsa));
 28		memcpy(ets->prio_tc, pdata->ets->prio_tc,
 29		       sizeof(ets->prio_tc));
 30	}
 31
 32	return 0;
 33}
 34
 35static int xgbe_dcb_ieee_setets(struct net_device *netdev,
 36				struct ieee_ets *ets)
 37{
 38	struct xgbe_prv_data *pdata = netdev_priv(netdev);
 39	unsigned int i, tc_ets, tc_ets_weight;
 40	u8 max_tc = 0;
 41
 42	tc_ets = 0;
 43	tc_ets_weight = 0;
 44	for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
 45		netif_dbg(pdata, drv, netdev,
 46			  "TC%u: tx_bw=%hhu, rx_bw=%hhu, tsa=%hhu\n", i,
 47			  ets->tc_tx_bw[i], ets->tc_rx_bw[i],
 48			  ets->tc_tsa[i]);
 49		netif_dbg(pdata, drv, netdev, "PRIO%u: TC=%hhu\n", i,
 50			  ets->prio_tc[i]);
 51
 52		max_tc = max_t(u8, max_tc, ets->prio_tc[i]);
 53		if ((ets->tc_tx_bw[i] || ets->tc_tsa[i]))
 54			max_tc = max_t(u8, max_tc, i);
 55
 56		switch (ets->tc_tsa[i]) {
 57		case IEEE_8021QAZ_TSA_STRICT:
 58			break;
 59		case IEEE_8021QAZ_TSA_ETS:
 60			tc_ets = 1;
 61			tc_ets_weight += ets->tc_tx_bw[i];
 62			break;
 63		default:
 64			netif_err(pdata, drv, netdev,
 65				  "unsupported TSA algorithm (%hhu)\n",
 66				  ets->tc_tsa[i]);
 67			return -EINVAL;
 68		}
 69	}
 70
 71	/* Check maximum traffic class requested */
 72	if (max_tc >= pdata->hw_feat.tc_cnt) {
 73		netif_err(pdata, drv, netdev,
 74			  "exceeded number of supported traffic classes\n");
 75		return -EINVAL;
 76	}
 77
 78	/* Weights must add up to 100% */
 79	if (tc_ets && (tc_ets_weight != 100)) {
 80		netif_err(pdata, drv, netdev,
 81			  "sum of ETS algorithm weights is not 100 (%u)\n",
 82			  tc_ets_weight);
 83		return -EINVAL;
 84	}
 85
 86	if (!pdata->ets) {
 87		pdata->ets = devm_kzalloc(pdata->dev, sizeof(*pdata->ets),
 88					  GFP_KERNEL);
 89		if (!pdata->ets)
 90			return -ENOMEM;
 91	}
 92
 93	pdata->num_tcs = max_tc + 1;
 94	memcpy(pdata->ets, ets, sizeof(*pdata->ets));
 95
 96	pdata->hw_if.config_dcb_tc(pdata);
 97
 98	return 0;
 99}
100
101static int xgbe_dcb_ieee_getpfc(struct net_device *netdev,
102				struct ieee_pfc *pfc)
103{
104	struct xgbe_prv_data *pdata = netdev_priv(netdev);
105
106	/* Set number of supported PFC traffic classes */
107	pfc->pfc_cap = pdata->hw_feat.tc_cnt;
108
109	if (pdata->pfc) {
110		pfc->pfc_en = pdata->pfc->pfc_en;
111		pfc->mbc = pdata->pfc->mbc;
112		pfc->delay = pdata->pfc->delay;
113	}
114
115	return 0;
116}
117
118static int xgbe_dcb_ieee_setpfc(struct net_device *netdev,
119				struct ieee_pfc *pfc)
120{
121	struct xgbe_prv_data *pdata = netdev_priv(netdev);
122
123	netif_dbg(pdata, drv, netdev,
124		  "cap=%d, en=%#x, mbc=%d, delay=%d\n",
125		  pfc->pfc_cap, pfc->pfc_en, pfc->mbc, pfc->delay);
126
127	/* Check PFC for supported number of traffic classes */
128	if (pfc->pfc_en & ~((1 << pdata->hw_feat.tc_cnt) - 1)) {
129		netif_err(pdata, drv, netdev,
130			  "PFC requested for unsupported traffic class\n");
131		return -EINVAL;
132	}
133
134	if (!pdata->pfc) {
135		pdata->pfc = devm_kzalloc(pdata->dev, sizeof(*pdata->pfc),
136					  GFP_KERNEL);
137		if (!pdata->pfc)
138			return -ENOMEM;
139	}
140
141	memcpy(pdata->pfc, pfc, sizeof(*pdata->pfc));
142
143	pdata->hw_if.config_dcb_pfc(pdata);
144
145	return 0;
146}
147
148static u8 xgbe_dcb_getdcbx(struct net_device *netdev)
149{
150	return DCB_CAP_DCBX_HOST | DCB_CAP_DCBX_VER_IEEE;
151}
152
153static u8 xgbe_dcb_setdcbx(struct net_device *netdev, u8 dcbx)
154{
155	struct xgbe_prv_data *pdata = netdev_priv(netdev);
156	u8 support = xgbe_dcb_getdcbx(netdev);
157
158	netif_dbg(pdata, drv, netdev, "DCBX=%#hhx\n", dcbx);
159
160	if (dcbx & ~support)
161		return 1;
162
163	if ((dcbx & support) != support)
164		return 1;
165
166	return 0;
167}
168
169static const struct dcbnl_rtnl_ops xgbe_dcbnl_ops = {
170	/* IEEE 802.1Qaz std */
171	.ieee_getets = xgbe_dcb_ieee_getets,
172	.ieee_setets = xgbe_dcb_ieee_setets,
173	.ieee_getpfc = xgbe_dcb_ieee_getpfc,
174	.ieee_setpfc = xgbe_dcb_ieee_setpfc,
175
176	/* DCBX configuration */
177	.getdcbx     = xgbe_dcb_getdcbx,
178	.setdcbx     = xgbe_dcb_setdcbx,
179};
180
181const struct dcbnl_rtnl_ops *xgbe_get_dcbnl_ops(void)
182{
183	return &xgbe_dcbnl_ops;
184}