1 /*
2 * Copyright(c) 2017 Intel Corporation.
3 *
4 * This file is provided under a dual BSD/GPLv2 license. When using or
5 * redistributing this file, you may do so under either license.
6 *
7 * GPL LICENSE SUMMARY
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of version 2 of the GNU General Public License as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * BSD LICENSE
19 *
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
22 * are met:
23 *
24 * - Redistributions of source code must retain the above copyright
25 * notice, this list of conditions and the following disclaimer.
26 * - Redistributions in binary form must reproduce the above copyright
27 * notice, this list of conditions and the following disclaimer in
28 * the documentation and/or other materials provided with the
29 * distribution.
30 * - Neither the name of Intel Corporation nor the names of its
31 * contributors may be used to endorse or promote products derived
32 * from this software without specific prior written permission.
33 *
34 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
35 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
36 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
37 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
38 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
39 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
40 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
41 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
42 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
43 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
45 *
46 */
47
48 /*
49 * This file contains OPA Virtual Network Interface Controller (VNIC) driver
50 * netdev functionality.
51 */
52
53 #include <linux/if_vlan.h>
54 #include <linux/crc32.h>
55
56 #include "opa_vnic_internal.h"
57
58 #define OPA_TX_TIMEOUT_MS 1000
59
60 #define OPA_VNIC_SKB_HEADROOM \
61 ALIGN((OPA_VNIC_HDR_LEN + OPA_VNIC_SKB_MDATA_LEN), 8)
62
63 /* This function is overloaded for opa_vnic specific implementation */
opa_vnic_get_stats64(struct net_device * netdev,struct rtnl_link_stats64 * stats)64 static void opa_vnic_get_stats64(struct net_device *netdev,
65 struct rtnl_link_stats64 *stats)
66 {
67 struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
68 struct opa_vnic_stats vstats;
69
70 memset(&vstats, 0, sizeof(vstats));
71 spin_lock(&adapter->stats_lock);
72 adapter->rn_ops->ndo_get_stats64(netdev, &vstats.netstats);
73 spin_unlock(&adapter->stats_lock);
74 memcpy(stats, &vstats.netstats, sizeof(*stats));
75 }
76
77 /* opa_netdev_start_xmit - transmit function */
opa_netdev_start_xmit(struct sk_buff * skb,struct net_device * netdev)78 static netdev_tx_t opa_netdev_start_xmit(struct sk_buff *skb,
79 struct net_device *netdev)
80 {
81 struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
82
83 v_dbg("xmit: queue %d skb len %d\n", skb->queue_mapping, skb->len);
84 /* pad to ensure mininum ethernet packet length */
85 if (unlikely(skb->len < ETH_ZLEN)) {
86 if (skb_padto(skb, ETH_ZLEN))
87 return NETDEV_TX_OK;
88
89 skb_put(skb, ETH_ZLEN - skb->len);
90 }
91
92 opa_vnic_encap_skb(adapter, skb);
93 return adapter->rn_ops->ndo_start_xmit(skb, netdev);
94 }
95
opa_vnic_select_queue(struct net_device * netdev,struct sk_buff * skb,struct net_device * sb_dev)96 static u16 opa_vnic_select_queue(struct net_device *netdev, struct sk_buff *skb,
97 struct net_device *sb_dev)
98 {
99 struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
100 struct opa_vnic_skb_mdata *mdata;
101 int rc;
102
103 /* pass entropy and vl as metadata in skb */
104 mdata = skb_push(skb, sizeof(*mdata));
105 mdata->entropy = opa_vnic_calc_entropy(skb);
106 mdata->vl = opa_vnic_get_vl(adapter, skb);
107 rc = adapter->rn_ops->ndo_select_queue(netdev, skb, sb_dev);
108 skb_pull(skb, sizeof(*mdata));
109 return rc;
110 }
111
opa_vnic_update_state(struct opa_vnic_adapter * adapter,bool up)112 static void opa_vnic_update_state(struct opa_vnic_adapter *adapter, bool up)
113 {
114 struct __opa_veswport_info *info = &adapter->info;
115
116 mutex_lock(&adapter->lock);
117 /* Operational state can only be DROP_ALL or FORWARDING */
118 if ((info->vport.config_state == OPA_VNIC_STATE_FORWARDING) && up) {
119 info->vport.oper_state = OPA_VNIC_STATE_FORWARDING;
120 info->vport.eth_link_status = OPA_VNIC_ETH_LINK_UP;
121 } else {
122 info->vport.oper_state = OPA_VNIC_STATE_DROP_ALL;
123 info->vport.eth_link_status = OPA_VNIC_ETH_LINK_DOWN;
124 }
125
126 if (info->vport.config_state == OPA_VNIC_STATE_FORWARDING)
127 netif_dormant_off(adapter->netdev);
128 else
129 netif_dormant_on(adapter->netdev);
130 mutex_unlock(&adapter->lock);
131 }
132
133 /* opa_vnic_process_vema_config - process vema configuration updates */
opa_vnic_process_vema_config(struct opa_vnic_adapter * adapter)134 void opa_vnic_process_vema_config(struct opa_vnic_adapter *adapter)
135 {
136 struct __opa_veswport_info *info = &adapter->info;
137 struct rdma_netdev *rn = netdev_priv(adapter->netdev);
138 u8 port_num[OPA_VESW_MAX_NUM_DEF_PORT] = { 0 };
139 struct net_device *netdev = adapter->netdev;
140 u8 i, port_count = 0;
141 u16 port_mask;
142
143 /* If the base_mac_addr is changed, update the interface mac address */
144 if (memcmp(info->vport.base_mac_addr, adapter->vema_mac_addr,
145 ARRAY_SIZE(info->vport.base_mac_addr))) {
146 struct sockaddr saddr;
147
148 memcpy(saddr.sa_data, info->vport.base_mac_addr,
149 ARRAY_SIZE(info->vport.base_mac_addr));
150 mutex_lock(&adapter->lock);
151 eth_commit_mac_addr_change(netdev, &saddr);
152 memcpy(adapter->vema_mac_addr,
153 info->vport.base_mac_addr, ETH_ALEN);
154 mutex_unlock(&adapter->lock);
155 }
156
157 rn->set_id(netdev, info->vesw.vesw_id);
158
159 /* Handle MTU limit change */
160 rtnl_lock();
161 netdev->max_mtu = max_t(unsigned int, info->vesw.eth_mtu,
162 netdev->min_mtu);
163 if (netdev->mtu > netdev->max_mtu)
164 dev_set_mtu(netdev, netdev->max_mtu);
165 rtnl_unlock();
166
167 /* Update flow to default port redirection table */
168 port_mask = info->vesw.def_port_mask;
169 for (i = 0; i < OPA_VESW_MAX_NUM_DEF_PORT; i++) {
170 if (port_mask & 1)
171 port_num[port_count++] = i;
172 port_mask >>= 1;
173 }
174
175 /*
176 * Build the flow table. Flow table is required when destination LID
177 * is not available. Up to OPA_VNIC_FLOW_TBL_SIZE flows supported.
178 * Each flow need a default port number to get its dlid from the
179 * u_ucast_dlid array.
180 */
181 for (i = 0; i < OPA_VNIC_FLOW_TBL_SIZE; i++)
182 adapter->flow_tbl[i] = port_count ? port_num[i % port_count] :
183 OPA_VNIC_INVALID_PORT;
184
185 /* update state */
186 opa_vnic_update_state(adapter, !!(netdev->flags & IFF_UP));
187 }
188
189 /*
190 * Set the power on default values in adapter's vema interface structure.
191 */
opa_vnic_set_pod_values(struct opa_vnic_adapter * adapter)192 static inline void opa_vnic_set_pod_values(struct opa_vnic_adapter *adapter)
193 {
194 adapter->info.vport.max_mac_tbl_ent = OPA_VNIC_MAC_TBL_MAX_ENTRIES;
195 adapter->info.vport.max_smac_ent = OPA_VNIC_MAX_SMAC_LIMIT;
196 adapter->info.vport.config_state = OPA_VNIC_STATE_DROP_ALL;
197 adapter->info.vport.eth_link_status = OPA_VNIC_ETH_LINK_DOWN;
198 adapter->info.vesw.eth_mtu = ETH_DATA_LEN;
199 }
200
201 /* opa_vnic_set_mac_addr - change mac address */
opa_vnic_set_mac_addr(struct net_device * netdev,void * addr)202 static int opa_vnic_set_mac_addr(struct net_device *netdev, void *addr)
203 {
204 struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
205 struct sockaddr *sa = addr;
206 int rc;
207
208 if (!memcmp(netdev->dev_addr, sa->sa_data, ETH_ALEN))
209 return 0;
210
211 mutex_lock(&adapter->lock);
212 rc = eth_mac_addr(netdev, addr);
213 mutex_unlock(&adapter->lock);
214 if (rc)
215 return rc;
216
217 adapter->info.vport.uc_macs_gen_count++;
218 opa_vnic_vema_report_event(adapter,
219 OPA_VESWPORT_TRAP_IFACE_UCAST_MAC_CHANGE);
220 return 0;
221 }
222
223 /*
224 * opa_vnic_mac_send_event - post event on possible mac list exchange
225 * Send trap when digest from uc/mc mac list differs from previous run.
226 * Digest is evaluated similar to how cksum does.
227 */
opa_vnic_mac_send_event(struct net_device * netdev,u8 event)228 static void opa_vnic_mac_send_event(struct net_device *netdev, u8 event)
229 {
230 struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
231 struct netdev_hw_addr *ha;
232 struct netdev_hw_addr_list *hw_list;
233 u32 *ref_crc;
234 u32 l, crc = 0;
235
236 switch (event) {
237 case OPA_VESWPORT_TRAP_IFACE_UCAST_MAC_CHANGE:
238 hw_list = &netdev->uc;
239 adapter->info.vport.uc_macs_gen_count++;
240 ref_crc = &adapter->umac_hash;
241 break;
242 case OPA_VESWPORT_TRAP_IFACE_MCAST_MAC_CHANGE:
243 hw_list = &netdev->mc;
244 adapter->info.vport.mc_macs_gen_count++;
245 ref_crc = &adapter->mmac_hash;
246 break;
247 default:
248 return;
249 }
250 netdev_hw_addr_list_for_each(ha, hw_list) {
251 crc = crc32_le(crc, ha->addr, ETH_ALEN);
252 }
253 l = netdev_hw_addr_list_count(hw_list) * ETH_ALEN;
254 crc = ~crc32_le(crc, (void *)&l, sizeof(l));
255
256 if (crc != *ref_crc) {
257 *ref_crc = crc;
258 opa_vnic_vema_report_event(adapter, event);
259 }
260 }
261
262 /* opa_vnic_set_rx_mode - handle uc/mc mac list change */
opa_vnic_set_rx_mode(struct net_device * netdev)263 static void opa_vnic_set_rx_mode(struct net_device *netdev)
264 {
265 opa_vnic_mac_send_event(netdev,
266 OPA_VESWPORT_TRAP_IFACE_UCAST_MAC_CHANGE);
267
268 opa_vnic_mac_send_event(netdev,
269 OPA_VESWPORT_TRAP_IFACE_MCAST_MAC_CHANGE);
270 }
271
272 /* opa_netdev_open - activate network interface */
opa_netdev_open(struct net_device * netdev)273 static int opa_netdev_open(struct net_device *netdev)
274 {
275 struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
276 int rc;
277
278 rc = adapter->rn_ops->ndo_open(adapter->netdev);
279 if (rc) {
280 v_dbg("open failed %d\n", rc);
281 return rc;
282 }
283
284 /* Update status and send trap */
285 opa_vnic_update_state(adapter, true);
286 opa_vnic_vema_report_event(adapter,
287 OPA_VESWPORT_TRAP_ETH_LINK_STATUS_CHANGE);
288 return 0;
289 }
290
291 /* opa_netdev_close - disable network interface */
opa_netdev_close(struct net_device * netdev)292 static int opa_netdev_close(struct net_device *netdev)
293 {
294 struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
295 int rc;
296
297 rc = adapter->rn_ops->ndo_stop(adapter->netdev);
298 if (rc) {
299 v_dbg("close failed %d\n", rc);
300 return rc;
301 }
302
303 /* Update status and send trap */
304 opa_vnic_update_state(adapter, false);
305 opa_vnic_vema_report_event(adapter,
306 OPA_VESWPORT_TRAP_ETH_LINK_STATUS_CHANGE);
307 return 0;
308 }
309
310 /* netdev ops */
311 static const struct net_device_ops opa_netdev_ops = {
312 .ndo_open = opa_netdev_open,
313 .ndo_stop = opa_netdev_close,
314 .ndo_start_xmit = opa_netdev_start_xmit,
315 .ndo_get_stats64 = opa_vnic_get_stats64,
316 .ndo_set_rx_mode = opa_vnic_set_rx_mode,
317 .ndo_select_queue = opa_vnic_select_queue,
318 .ndo_set_mac_address = opa_vnic_set_mac_addr,
319 };
320
321 /* opa_vnic_add_netdev - create vnic netdev interface */
opa_vnic_add_netdev(struct ib_device * ibdev,u8 port_num,u8 vport_num)322 struct opa_vnic_adapter *opa_vnic_add_netdev(struct ib_device *ibdev,
323 u8 port_num, u8 vport_num)
324 {
325 struct opa_vnic_adapter *adapter;
326 struct net_device *netdev;
327 struct rdma_netdev *rn;
328 int rc;
329
330 netdev = ibdev->ops.alloc_rdma_netdev(ibdev, port_num,
331 RDMA_NETDEV_OPA_VNIC,
332 "veth%d", NET_NAME_UNKNOWN,
333 ether_setup);
334 if (!netdev)
335 return ERR_PTR(-ENOMEM);
336 else if (IS_ERR(netdev))
337 return ERR_CAST(netdev);
338
339 rn = netdev_priv(netdev);
340 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
341 if (!adapter) {
342 rc = -ENOMEM;
343 goto adapter_err;
344 }
345
346 rn->clnt_priv = adapter;
347 rn->hca = ibdev;
348 rn->port_num = port_num;
349 adapter->netdev = netdev;
350 adapter->ibdev = ibdev;
351 adapter->port_num = port_num;
352 adapter->vport_num = vport_num;
353 adapter->rn_ops = netdev->netdev_ops;
354
355 netdev->netdev_ops = &opa_netdev_ops;
356 netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
357 netdev->hard_header_len += OPA_VNIC_SKB_HEADROOM;
358 mutex_init(&adapter->lock);
359 mutex_init(&adapter->mactbl_lock);
360 spin_lock_init(&adapter->stats_lock);
361
362 SET_NETDEV_DEV(netdev, ibdev->dev.parent);
363
364 opa_vnic_set_ethtool_ops(netdev);
365
366 opa_vnic_set_pod_values(adapter);
367
368 rc = register_netdev(netdev);
369 if (rc)
370 goto netdev_err;
371
372 netif_carrier_off(netdev);
373 netif_dormant_on(netdev);
374 v_info("initialized\n");
375
376 return adapter;
377 netdev_err:
378 mutex_destroy(&adapter->lock);
379 mutex_destroy(&adapter->mactbl_lock);
380 kfree(adapter);
381 adapter_err:
382 rn->free_rdma_netdev(netdev);
383
384 return ERR_PTR(rc);
385 }
386
387 /* opa_vnic_rem_netdev - remove vnic netdev interface */
opa_vnic_rem_netdev(struct opa_vnic_adapter * adapter)388 void opa_vnic_rem_netdev(struct opa_vnic_adapter *adapter)
389 {
390 struct net_device *netdev = adapter->netdev;
391 struct rdma_netdev *rn = netdev_priv(netdev);
392
393 v_info("removing\n");
394 unregister_netdev(netdev);
395 opa_vnic_release_mac_tbl(adapter);
396 mutex_destroy(&adapter->lock);
397 mutex_destroy(&adapter->mactbl_lock);
398 kfree(adapter);
399 rn->free_rdma_netdev(netdev);
400 }
401