1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright 2023 Bootlin
  4 *
  5 */
  6#include "common.h"
  7#include "netlink.h"
  8
  9#include <linux/phy.h>
 10#include <linux/phy_link_topology.h>
 11#include <linux/sfp.h>
 12
 13struct phy_req_info {
 14	struct ethnl_req_info		base;
 15	struct phy_device_node		*pdn;
 16};
 17
 18#define PHY_REQINFO(__req_base) \
 19	container_of(__req_base, struct phy_req_info, base)
 20
 21const struct nla_policy ethnl_phy_get_policy[ETHTOOL_A_PHY_HEADER + 1] = {
 22	[ETHTOOL_A_PHY_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy),
 23};
 24
 25/* Caller holds rtnl */
 26static ssize_t
 27ethnl_phy_reply_size(const struct ethnl_req_info *req_base,
 28		     struct netlink_ext_ack *extack)
 29{
 30	struct phy_req_info *req_info = PHY_REQINFO(req_base);
 31	struct phy_device_node *pdn = req_info->pdn;
 32	struct phy_device *phydev = pdn->phy;
 33	size_t size = 0;
 34
 35	ASSERT_RTNL();
 36
 37	/* ETHTOOL_A_PHY_INDEX */
 38	size += nla_total_size(sizeof(u32));
 39
 40	/* ETHTOOL_A_DRVNAME */
 41	if (phydev->drv)
 42		size += nla_total_size(strlen(phydev->drv->name) + 1);
 43
 44	/* ETHTOOL_A_NAME */
 45	size += nla_total_size(strlen(dev_name(&phydev->mdio.dev)) + 1);
 46
 47	/* ETHTOOL_A_PHY_UPSTREAM_TYPE */
 48	size += nla_total_size(sizeof(u32));
 49
 50	if (phy_on_sfp(phydev)) {
 51		const char *upstream_sfp_name = sfp_get_name(pdn->parent_sfp_bus);
 52
 53		/* ETHTOOL_A_PHY_UPSTREAM_SFP_NAME */
 54		if (upstream_sfp_name)
 55			size += nla_total_size(strlen(upstream_sfp_name) + 1);
 56
 57		/* ETHTOOL_A_PHY_UPSTREAM_INDEX */
 58		size += nla_total_size(sizeof(u32));
 59	}
 60
 61	/* ETHTOOL_A_PHY_DOWNSTREAM_SFP_NAME */
 62	if (phydev->sfp_bus) {
 63		const char *sfp_name = sfp_get_name(phydev->sfp_bus);
 64
 65		if (sfp_name)
 66			size += nla_total_size(strlen(sfp_name) + 1);
 67	}
 68
 69	return size;
 70}
 71
 72static int
 73ethnl_phy_fill_reply(const struct ethnl_req_info *req_base, struct sk_buff *skb)
 74{
 75	struct phy_req_info *req_info = PHY_REQINFO(req_base);
 76	struct phy_device_node *pdn = req_info->pdn;
 77	struct phy_device *phydev = pdn->phy;
 78	enum phy_upstream ptype;
 79
 80	ptype = pdn->upstream_type;
 81
 82	if (nla_put_u32(skb, ETHTOOL_A_PHY_INDEX, phydev->phyindex) ||
 83	    nla_put_string(skb, ETHTOOL_A_PHY_NAME, dev_name(&phydev->mdio.dev)) ||
 84	    nla_put_u32(skb, ETHTOOL_A_PHY_UPSTREAM_TYPE, ptype))
 85		return -EMSGSIZE;
 86
 87	if (phydev->drv &&
 88	    nla_put_string(skb, ETHTOOL_A_PHY_DRVNAME, phydev->drv->name))
 89		return -EMSGSIZE;
 90
 91	if (ptype == PHY_UPSTREAM_PHY) {
 92		struct phy_device *upstream = pdn->upstream.phydev;
 93		const char *sfp_upstream_name;
 94
 95		/* Parent index */
 96		if (nla_put_u32(skb, ETHTOOL_A_PHY_UPSTREAM_INDEX, upstream->phyindex))
 97			return -EMSGSIZE;
 98
 99		if (pdn->parent_sfp_bus) {
100			sfp_upstream_name = sfp_get_name(pdn->parent_sfp_bus);
101			if (sfp_upstream_name &&
102			    nla_put_string(skb, ETHTOOL_A_PHY_UPSTREAM_SFP_NAME,
103					   sfp_upstream_name))
104				return -EMSGSIZE;
105		}
106	}
107
108	if (phydev->sfp_bus) {
109		const char *sfp_name = sfp_get_name(phydev->sfp_bus);
110
111		if (sfp_name &&
112		    nla_put_string(skb, ETHTOOL_A_PHY_DOWNSTREAM_SFP_NAME,
113				   sfp_name))
114			return -EMSGSIZE;
115	}
116
117	return 0;
118}
119
120static int ethnl_phy_parse_request(struct ethnl_req_info *req_base,
121				   struct nlattr **tb,
122				   struct netlink_ext_ack *extack)
123{
124	struct phy_link_topology *topo = req_base->dev->link_topo;
125	struct phy_req_info *req_info = PHY_REQINFO(req_base);
126	struct phy_device *phydev;
127
128	phydev = ethnl_req_get_phydev(req_base, tb, ETHTOOL_A_PHY_HEADER,
129				      extack);
130	if (!phydev)
131		return 0;
132
133	if (IS_ERR(phydev))
134		return PTR_ERR(phydev);
135
136	if (!topo)
137		return 0;
138
139	req_info->pdn = xa_load(&topo->phys, phydev->phyindex);
140
141	return 0;
142}
143
144int ethnl_phy_doit(struct sk_buff *skb, struct genl_info *info)
145{
146	struct phy_req_info req_info = {};
147	struct nlattr **tb = info->attrs;
148	struct sk_buff *rskb;
149	void *reply_payload;
150	int reply_len;
151	int ret;
152
153	ret = ethnl_parse_header_dev_get(&req_info.base,
154					 tb[ETHTOOL_A_PHY_HEADER],
155					 genl_info_net(info), info->extack,
156					 true);
157	if (ret < 0)
158		return ret;
159
160	rtnl_lock();
161
162	ret = ethnl_phy_parse_request(&req_info.base, tb, info->extack);
163	if (ret < 0)
164		goto err_unlock_rtnl;
165
166	/* No PHY, return early */
167	if (!req_info.pdn)
168		goto err_unlock_rtnl;
169
170	ret = ethnl_phy_reply_size(&req_info.base, info->extack);
171	if (ret < 0)
172		goto err_unlock_rtnl;
173	reply_len = ret + ethnl_reply_header_size();
174
175	rskb = ethnl_reply_init(reply_len, req_info.base.dev,
176				ETHTOOL_MSG_PHY_GET_REPLY,
177				ETHTOOL_A_PHY_HEADER,
178				info, &reply_payload);
179	if (!rskb) {
180		ret = -ENOMEM;
181		goto err_unlock_rtnl;
182	}
183
184	ret = ethnl_phy_fill_reply(&req_info.base, rskb);
185	if (ret)
186		goto err_free_msg;
187
188	rtnl_unlock();
189	ethnl_parse_header_dev_put(&req_info.base);
190	genlmsg_end(rskb, reply_payload);
191
192	return genlmsg_reply(rskb, info);
193
194err_free_msg:
195	nlmsg_free(rskb);
196err_unlock_rtnl:
197	rtnl_unlock();
198	ethnl_parse_header_dev_put(&req_info.base);
199	return ret;
200}
201
202struct ethnl_phy_dump_ctx {
203	struct phy_req_info	*phy_req_info;
204	unsigned long ifindex;
205	unsigned long phy_index;
206};
207
208int ethnl_phy_start(struct netlink_callback *cb)
209{
210	const struct genl_info *info = genl_info_dump(cb);
211	struct ethnl_phy_dump_ctx *ctx = (void *)cb->ctx;
212	int ret;
213
214	BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
215
216	ctx->phy_req_info = kzalloc(sizeof(*ctx->phy_req_info), GFP_KERNEL);
217	if (!ctx->phy_req_info)
218		return -ENOMEM;
219
220	ret = ethnl_parse_header_dev_get(&ctx->phy_req_info->base,
221					 info->attrs[ETHTOOL_A_PHY_HEADER],
222					 sock_net(cb->skb->sk), cb->extack,
223					 false);
224	ctx->ifindex = 0;
225	ctx->phy_index = 0;
226
227	if (ret)
228		kfree(ctx->phy_req_info);
229
230	return ret;
231}
232
233int ethnl_phy_done(struct netlink_callback *cb)
234{
235	struct ethnl_phy_dump_ctx *ctx = (void *)cb->ctx;
236
237	if (ctx->phy_req_info->base.dev)
238		ethnl_parse_header_dev_put(&ctx->phy_req_info->base);
239
240	kfree(ctx->phy_req_info);
241
242	return 0;
243}
244
245static int ethnl_phy_dump_one_dev(struct sk_buff *skb, struct net_device *dev,
246				  struct netlink_callback *cb)
247{
248	struct ethnl_phy_dump_ctx *ctx = (void *)cb->ctx;
249	struct phy_req_info *pri = ctx->phy_req_info;
250	struct phy_device_node *pdn;
251	int ret = 0;
252	void *ehdr;
253
254	if (!dev->link_topo)
255		return 0;
256
257	xa_for_each_start(&dev->link_topo->phys, ctx->phy_index, pdn, ctx->phy_index) {
258		ehdr = ethnl_dump_put(skb, cb, ETHTOOL_MSG_PHY_GET_REPLY);
259		if (!ehdr) {
260			ret = -EMSGSIZE;
261			break;
262		}
263
264		ret = ethnl_fill_reply_header(skb, dev, ETHTOOL_A_PHY_HEADER);
265		if (ret < 0) {
266			genlmsg_cancel(skb, ehdr);
267			break;
268		}
269
270		pri->pdn = pdn;
271		ret = ethnl_phy_fill_reply(&pri->base, skb);
272		if (ret < 0) {
273			genlmsg_cancel(skb, ehdr);
274			break;
275		}
276
277		genlmsg_end(skb, ehdr);
278	}
279
280	return ret;
281}
282
283int ethnl_phy_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
284{
285	struct ethnl_phy_dump_ctx *ctx = (void *)cb->ctx;
286	struct net *net = sock_net(skb->sk);
287	struct net_device *dev;
288	int ret = 0;
289
290	rtnl_lock();
291
292	if (ctx->phy_req_info->base.dev) {
293		ret = ethnl_phy_dump_one_dev(skb, ctx->phy_req_info->base.dev, cb);
294	} else {
295		for_each_netdev_dump(net, dev, ctx->ifindex) {
296			ret = ethnl_phy_dump_one_dev(skb, dev, cb);
297			if (ret)
298				break;
299
300			ctx->phy_index = 0;
301		}
302	}
303	rtnl_unlock();
304
305	return ret;
306}