summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c
blob: 346d310914df17791018108d5ddd67715b04ce92 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
/* Copyright (c) 2013-2017, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 *
 * RMNET Data virtual network driver
 *
 */

#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <net/pkt_sched.h>
#include "rmnet_config.h"
#include "rmnet_handlers.h"
#include "rmnet_private.h"
#include "rmnet_map.h"
#include "rmnet_vnd.h"

/* RX/TX Fixup */

void rmnet_vnd_rx_fixup(struct sk_buff *skb, struct net_device *dev)
{
	struct rmnet_priv *priv = netdev_priv(dev);
	struct rmnet_pcpu_stats *pcpu_ptr;

	pcpu_ptr = this_cpu_ptr(priv->pcpu_stats);

	u64_stats_update_begin(&pcpu_ptr->syncp);
	pcpu_ptr->stats.rx_pkts++;
	pcpu_ptr->stats.rx_bytes += skb->len;
	u64_stats_update_end(&pcpu_ptr->syncp);
}

void rmnet_vnd_tx_fixup(struct sk_buff *skb, struct net_device *dev)
{
	struct rmnet_priv *priv = netdev_priv(dev);
	struct rmnet_pcpu_stats *pcpu_ptr;

	pcpu_ptr = this_cpu_ptr(priv->pcpu_stats);

	u64_stats_update_begin(&pcpu_ptr->syncp);
	pcpu_ptr->stats.tx_pkts++;
	pcpu_ptr->stats.tx_bytes += skb->len;
	u64_stats_update_end(&pcpu_ptr->syncp);
}

/* Network Device Operations */

static netdev_tx_t rmnet_vnd_start_xmit(struct sk_buff *skb,
					struct net_device *dev)
{
	struct rmnet_priv *priv;

	priv = netdev_priv(dev);
	if (priv->real_dev) {
		rmnet_egress_handler(skb);
	} else {
		this_cpu_inc(priv->pcpu_stats->stats.tx_drops);
		kfree_skb(skb);
	}
	return NETDEV_TX_OK;
}

static int rmnet_vnd_change_mtu(struct net_device *rmnet_dev, int new_mtu)
{
	if (new_mtu < 0 || new_mtu > RMNET_MAX_PACKET_SIZE)
		return -EINVAL;

	rmnet_dev->mtu = new_mtu;
	return 0;
}

static int rmnet_vnd_get_iflink(const struct net_device *dev)
{
	struct rmnet_priv *priv = netdev_priv(dev);

	return priv->real_dev->ifindex;
}

static int rmnet_vnd_init(struct net_device *dev)
{
	struct rmnet_priv *priv = netdev_priv(dev);
	int err;

	priv->pcpu_stats = alloc_percpu(struct rmnet_pcpu_stats);
	if (!priv->pcpu_stats)
		return -ENOMEM;

	err = gro_cells_init(&priv->gro_cells, dev);
	if (err) {
		free_percpu(priv->pcpu_stats);
		return err;
	}

	return 0;
}

static void rmnet_vnd_uninit(struct net_device *dev)
{
	struct rmnet_priv *priv = netdev_priv(dev);

	gro_cells_destroy(&priv->gro_cells);
	free_percpu(priv->pcpu_stats);
}

static void rmnet_get_stats64(struct net_device *dev,
			      struct rtnl_link_stats64 *s)
{
	struct rmnet_priv *priv = netdev_priv(dev);
	struct rmnet_vnd_stats total_stats;
	struct rmnet_pcpu_stats *pcpu_ptr;
	unsigned int cpu, start;

	memset(&total_stats, 0, sizeof(struct rmnet_vnd_stats));

	for_each_possible_cpu(cpu) {
		pcpu_ptr = per_cpu_ptr(priv->pcpu_stats, cpu);

		do {
			start = u64_stats_fetch_begin_irq(&pcpu_ptr->syncp);
			total_stats.rx_pkts += pcpu_ptr->stats.rx_pkts;
			total_stats.rx_bytes += pcpu_ptr->stats.rx_bytes;
			total_stats.tx_pkts += pcpu_ptr->stats.tx_pkts;
			total_stats.tx_bytes += pcpu_ptr->stats.tx_bytes;
		} while (u64_stats_fetch_retry_irq(&pcpu_ptr->syncp, start));

		total_stats.tx_drops += pcpu_ptr->stats.tx_drops;
	}

	s->rx_packets = total_stats.rx_pkts;
	s->rx_bytes = total_stats.rx_bytes;
	s->tx_packets = total_stats.tx_pkts;
	s->tx_bytes = total_stats.tx_bytes;
	s->tx_dropped = total_stats.tx_drops;
}

static const struct net_device_ops rmnet_vnd_ops = {
	.ndo_start_xmit = rmnet_vnd_start_xmit,
	.ndo_change_mtu = rmnet_vnd_change_mtu,
	.ndo_get_iflink = rmnet_vnd_get_iflink,
	.ndo_add_slave  = rmnet_add_bridge,
	.ndo_del_slave  = rmnet_del_bridge,
	.ndo_init       = rmnet_vnd_init,
	.ndo_uninit     = rmnet_vnd_uninit,
	.ndo_get_stats64 = rmnet_get_stats64,
};

/* Called by kernel whenever a new rmnet<n> device is created. Sets MTU,
 * flags, ARP type, needed headroom, etc...
 */
void rmnet_vnd_setup(struct net_device *rmnet_dev)
{
	rmnet_dev->netdev_ops = &rmnet_vnd_ops;
	rmnet_dev->mtu = RMNET_DFLT_PACKET_SIZE;
	rmnet_dev->needed_headroom = RMNET_NEEDED_HEADROOM;
	random_ether_addr(rmnet_dev->dev_addr);
	rmnet_dev->tx_queue_len = RMNET_TX_QUEUE_LEN;

	/* Raw IP mode */
	rmnet_dev->header_ops = NULL;  /* No header */
	rmnet_dev->type = ARPHRD_RAWIP;
	rmnet_dev->hard_header_len = 0;
	rmnet_dev->flags &= ~(IFF_BROADCAST | IFF_MULTICAST);

	rmnet_dev->needs_free_netdev = true;
}

/* Exposed API */

int rmnet_vnd_newlink(u8 id, struct net_device *rmnet_dev,
		      struct rmnet_port *port,
		      struct net_device *real_dev,
		      struct rmnet_endpoint *ep)
{
	struct rmnet_priv *priv;
	int rc;

	if (ep->egress_dev)
		return -EINVAL;

	if (rmnet_get_endpoint(port, id))
		return -EBUSY;

	rmnet_dev->hw_features = NETIF_F_RXCSUM;
	rmnet_dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
	rmnet_dev->hw_features |= NETIF_F_SG;

	rc = register_netdevice(rmnet_dev);
	if (!rc) {
		ep->egress_dev = rmnet_dev;
		ep->mux_id = id;
		port->nr_rmnet_devs++;

		rmnet_dev->rtnl_link_ops = &rmnet_link_ops;

		priv = netdev_priv(rmnet_dev);
		priv->mux_id = id;
		priv->real_dev = real_dev;

		netdev_dbg(rmnet_dev, "rmnet dev created\n");
	}

	return rc;
}

int rmnet_vnd_dellink(u8 id, struct rmnet_port *port,
		      struct rmnet_endpoint *ep)
{
	if (id >= RMNET_MAX_LOGICAL_EP || !ep->egress_dev)
		return -EINVAL;

	ep->egress_dev = NULL;
	port->nr_rmnet_devs--;
	return 0;
}

u8 rmnet_vnd_get_mux(struct net_device *rmnet_dev)
{
	struct rmnet_priv *priv;

	priv = netdev_priv(rmnet_dev);
	return priv->mux_id;
}

int rmnet_vnd_do_flow_control(struct net_device *rmnet_dev, int enable)
{
	netdev_dbg(rmnet_dev, "Setting VND TX queue state to %d\n", enable);
	/* Although we expect similar number of enable/disable
	 * commands, optimize for the disable. That is more
	 * latency sensitive than enable
	 */
	if (unlikely(enable))
		netif_wake_queue(rmnet_dev);
	else
		netif_stop_queue(rmnet_dev);

	return 0;
}