1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2013-2018, The Linux Foundation. All rights reserved.
4 * RMNET Data virtual network driver
7 #include <linux/etherdevice.h>
8 #include <linux/ethtool.h>
9 #include <linux/if_arp.h>
10 #include <net/pkt_sched.h>
11 #include "rmnet_config.h"
12 #include "rmnet_handlers.h"
13 #include "rmnet_private.h"
14 #include "rmnet_map.h"
15 #include "rmnet_vnd.h"
19 void rmnet_vnd_rx_fixup(struct sk_buff *skb, struct net_device *dev)
21 struct rmnet_priv *priv = netdev_priv(dev);
22 struct rmnet_pcpu_stats *pcpu_ptr;
24 pcpu_ptr = this_cpu_ptr(priv->pcpu_stats);
26 u64_stats_update_begin(&pcpu_ptr->syncp);
27 pcpu_ptr->stats.rx_pkts++;
28 pcpu_ptr->stats.rx_bytes += skb->len;
29 u64_stats_update_end(&pcpu_ptr->syncp);
32 void rmnet_vnd_tx_fixup_len(unsigned int len, struct net_device *dev)
34 struct rmnet_priv *priv = netdev_priv(dev);
35 struct rmnet_pcpu_stats *pcpu_ptr;
37 pcpu_ptr = this_cpu_ptr(priv->pcpu_stats);
39 u64_stats_update_begin(&pcpu_ptr->syncp);
40 pcpu_ptr->stats.tx_pkts++;
41 pcpu_ptr->stats.tx_bytes += len;
42 u64_stats_update_end(&pcpu_ptr->syncp);
45 void rmnet_vnd_tx_fixup(struct sk_buff *skb, struct net_device *dev)
47 rmnet_vnd_tx_fixup_len(skb->len, dev);
50 /* Network Device Operations */
52 static netdev_tx_t rmnet_vnd_start_xmit(struct sk_buff *skb,
53 struct net_device *dev)
55 struct rmnet_priv *priv;
57 priv = netdev_priv(dev);
59 rmnet_egress_handler(skb);
61 this_cpu_inc(priv->pcpu_stats->stats.tx_drops);
67 static int rmnet_vnd_headroom(struct rmnet_port *port)
71 headroom = sizeof(struct rmnet_map_header);
73 if (port->data_format & RMNET_FLAGS_EGRESS_MAP_CKSUMV4)
74 headroom += sizeof(struct rmnet_map_ul_csum_header);
79 static int rmnet_vnd_change_mtu(struct net_device *rmnet_dev, int new_mtu)
81 struct rmnet_priv *priv = netdev_priv(rmnet_dev);
82 struct rmnet_port *port;
85 port = rmnet_get_port_rtnl(priv->real_dev);
87 headroom = rmnet_vnd_headroom(port);
89 if (new_mtu < 0 || new_mtu > RMNET_MAX_PACKET_SIZE ||
90 new_mtu > (priv->real_dev->mtu - headroom))
93 rmnet_dev->mtu = new_mtu;
97 static int rmnet_vnd_get_iflink(const struct net_device *dev)
99 struct rmnet_priv *priv = netdev_priv(dev);
101 return priv->real_dev->ifindex;
104 static int rmnet_vnd_init(struct net_device *dev)
106 struct rmnet_priv *priv = netdev_priv(dev);
109 priv->pcpu_stats = alloc_percpu(struct rmnet_pcpu_stats);
110 if (!priv->pcpu_stats)
113 err = gro_cells_init(&priv->gro_cells, dev);
115 free_percpu(priv->pcpu_stats);
122 static void rmnet_vnd_uninit(struct net_device *dev)
124 struct rmnet_priv *priv = netdev_priv(dev);
126 gro_cells_destroy(&priv->gro_cells);
127 free_percpu(priv->pcpu_stats);
130 static void rmnet_get_stats64(struct net_device *dev,
131 struct rtnl_link_stats64 *s)
133 struct rmnet_priv *priv = netdev_priv(dev);
134 struct rmnet_vnd_stats total_stats = { };
135 struct rmnet_pcpu_stats *pcpu_ptr;
136 struct rmnet_vnd_stats snapshot;
137 unsigned int cpu, start;
139 for_each_possible_cpu(cpu) {
140 pcpu_ptr = per_cpu_ptr(priv->pcpu_stats, cpu);
143 start = u64_stats_fetch_begin(&pcpu_ptr->syncp);
144 snapshot = pcpu_ptr->stats; /* struct assignment */
145 } while (u64_stats_fetch_retry(&pcpu_ptr->syncp, start));
147 total_stats.rx_pkts += snapshot.rx_pkts;
148 total_stats.rx_bytes += snapshot.rx_bytes;
149 total_stats.tx_pkts += snapshot.tx_pkts;
150 total_stats.tx_bytes += snapshot.tx_bytes;
151 total_stats.tx_drops += snapshot.tx_drops;
154 s->rx_packets = total_stats.rx_pkts;
155 s->rx_bytes = total_stats.rx_bytes;
156 s->tx_packets = total_stats.tx_pkts;
157 s->tx_bytes = total_stats.tx_bytes;
158 s->tx_dropped = total_stats.tx_drops;
161 static const struct net_device_ops rmnet_vnd_ops = {
162 .ndo_start_xmit = rmnet_vnd_start_xmit,
163 .ndo_change_mtu = rmnet_vnd_change_mtu,
164 .ndo_get_iflink = rmnet_vnd_get_iflink,
165 .ndo_add_slave = rmnet_add_bridge,
166 .ndo_del_slave = rmnet_del_bridge,
167 .ndo_init = rmnet_vnd_init,
168 .ndo_uninit = rmnet_vnd_uninit,
169 .ndo_get_stats64 = rmnet_get_stats64,
172 static const char rmnet_gstrings_stats[][ETH_GSTRING_LEN] = {
174 "Bad IPv4 header checksum",
175 "Checksum valid bit not set",
176 "Checksum validation failed",
177 "Checksum error bad buffer",
178 "Checksum error bad ip version",
179 "Checksum error bad transport",
180 "Checksum skipped on ip fragment",
182 "Checksum computed in software",
183 "Checksum computed in hardware",
186 static void rmnet_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
190 memcpy(buf, &rmnet_gstrings_stats,
191 sizeof(rmnet_gstrings_stats));
196 static int rmnet_get_sset_count(struct net_device *dev, int sset)
200 return ARRAY_SIZE(rmnet_gstrings_stats);
206 static void rmnet_get_ethtool_stats(struct net_device *dev,
207 struct ethtool_stats *stats, u64 *data)
209 struct rmnet_priv *priv = netdev_priv(dev);
210 struct rmnet_priv_stats *st = &priv->stats;
215 memcpy(data, st, ARRAY_SIZE(rmnet_gstrings_stats) * sizeof(u64));
218 static int rmnet_get_coalesce(struct net_device *dev,
219 struct ethtool_coalesce *coal,
220 struct kernel_ethtool_coalesce *kernel_coal,
221 struct netlink_ext_ack *extack)
223 struct rmnet_priv *priv = netdev_priv(dev);
224 struct rmnet_port *port;
226 port = rmnet_get_port_rtnl(priv->real_dev);
228 memset(kernel_coal, 0, sizeof(*kernel_coal));
229 kernel_coal->tx_aggr_max_bytes = port->egress_agg_params.bytes;
230 kernel_coal->tx_aggr_max_frames = port->egress_agg_params.count;
231 kernel_coal->tx_aggr_time_usecs = div_u64(port->egress_agg_params.time_nsec,
237 static int rmnet_set_coalesce(struct net_device *dev,
238 struct ethtool_coalesce *coal,
239 struct kernel_ethtool_coalesce *kernel_coal,
240 struct netlink_ext_ack *extack)
242 struct rmnet_priv *priv = netdev_priv(dev);
243 struct rmnet_port *port;
245 port = rmnet_get_port_rtnl(priv->real_dev);
247 if (kernel_coal->tx_aggr_max_frames < 1 || kernel_coal->tx_aggr_max_frames > 64)
250 if (kernel_coal->tx_aggr_max_bytes > 32768)
253 rmnet_map_update_ul_agg_config(port, kernel_coal->tx_aggr_max_bytes,
254 kernel_coal->tx_aggr_max_frames,
255 kernel_coal->tx_aggr_time_usecs);
260 static const struct ethtool_ops rmnet_ethtool_ops = {
261 .supported_coalesce_params = ETHTOOL_COALESCE_TX_AGGR,
262 .get_coalesce = rmnet_get_coalesce,
263 .set_coalesce = rmnet_set_coalesce,
264 .get_ethtool_stats = rmnet_get_ethtool_stats,
265 .get_strings = rmnet_get_strings,
266 .get_sset_count = rmnet_get_sset_count,
269 /* Called by kernel whenever a new rmnet<n> device is created. Sets MTU,
270 * flags, ARP type, needed headroom, etc...
272 void rmnet_vnd_setup(struct net_device *rmnet_dev)
274 rmnet_dev->netdev_ops = &rmnet_vnd_ops;
275 rmnet_dev->mtu = RMNET_DFLT_PACKET_SIZE;
276 rmnet_dev->needed_headroom = RMNET_NEEDED_HEADROOM;
277 eth_hw_addr_random(rmnet_dev);
278 rmnet_dev->tx_queue_len = RMNET_TX_QUEUE_LEN;
281 rmnet_dev->header_ops = NULL; /* No header */
282 rmnet_dev->type = ARPHRD_RAWIP;
283 rmnet_dev->hard_header_len = 0;
284 rmnet_dev->flags &= ~(IFF_BROADCAST | IFF_MULTICAST);
286 rmnet_dev->needs_free_netdev = true;
287 rmnet_dev->ethtool_ops = &rmnet_ethtool_ops;
289 rmnet_dev->features |= NETIF_F_LLTX;
291 /* This perm addr will be used as interface identifier by IPv6 */
292 rmnet_dev->addr_assign_type = NET_ADDR_RANDOM;
293 eth_random_addr(rmnet_dev->perm_addr);
298 int rmnet_vnd_newlink(u8 id, struct net_device *rmnet_dev,
299 struct rmnet_port *port,
300 struct net_device *real_dev,
301 struct rmnet_endpoint *ep,
302 struct netlink_ext_ack *extack)
305 struct rmnet_priv *priv = netdev_priv(rmnet_dev);
309 if (rmnet_get_endpoint(port, id)) {
310 NL_SET_ERR_MSG_MOD(extack, "MUX ID already exists");
314 rmnet_dev->hw_features = NETIF_F_RXCSUM;
315 rmnet_dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
316 rmnet_dev->hw_features |= NETIF_F_SG;
318 priv->real_dev = real_dev;
320 headroom = rmnet_vnd_headroom(port);
322 if (rmnet_vnd_change_mtu(rmnet_dev, real_dev->mtu - headroom)) {
323 NL_SET_ERR_MSG_MOD(extack, "Invalid MTU on real dev");
327 rc = register_netdevice(rmnet_dev);
329 ep->egress_dev = rmnet_dev;
331 port->nr_rmnet_devs++;
333 rmnet_dev->rtnl_link_ops = &rmnet_link_ops;
337 netdev_dbg(rmnet_dev, "rmnet dev created\n");
343 int rmnet_vnd_dellink(u8 id, struct rmnet_port *port,
344 struct rmnet_endpoint *ep)
346 if (id >= RMNET_MAX_LOGICAL_EP || !ep->egress_dev)
349 ep->egress_dev = NULL;
350 port->nr_rmnet_devs--;
354 int rmnet_vnd_do_flow_control(struct net_device *rmnet_dev, int enable)
356 netdev_dbg(rmnet_dev, "Setting VND TX queue state to %d\n", enable);
357 /* Although we expect similar number of enable/disable
358 * commands, optimize for the disable. That is more
359 * latency sensitive than enable
361 if (unlikely(enable))
362 netif_wake_queue(rmnet_dev);
364 netif_stop_queue(rmnet_dev);
369 int rmnet_vnd_validate_real_dev_mtu(struct net_device *real_dev)
371 struct hlist_node *tmp_ep;
372 struct rmnet_endpoint *ep;
373 struct rmnet_port *port;
374 unsigned long bkt_ep;
377 port = rmnet_get_port_rtnl(real_dev);
379 headroom = rmnet_vnd_headroom(port);
381 hash_for_each_safe(port->muxed_ep, bkt_ep, tmp_ep, ep, hlnode) {
382 if (ep->egress_dev->mtu > (real_dev->mtu - headroom))
389 int rmnet_vnd_update_dev_mtu(struct rmnet_port *port,
390 struct net_device *real_dev)
392 struct hlist_node *tmp_ep;
393 struct rmnet_endpoint *ep;
394 unsigned long bkt_ep;
397 headroom = rmnet_vnd_headroom(port);
399 hash_for_each_safe(port->muxed_ep, bkt_ep, tmp_ep, ep, hlnode) {
400 if (ep->egress_dev->mtu <= (real_dev->mtu - headroom))
403 if (rmnet_vnd_change_mtu(ep->egress_dev,
404 real_dev->mtu - headroom))