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44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
49 * This file contains OPA Virtual Network Interface Controller (VNIC) driver
50 * netdev functionality.
53 #include <linux/module.h>
54 #include <linux/if_vlan.h>
55 #include <linux/crc32.h>
57 #include "opa_vnic_internal.h"
59 #define OPA_TX_TIMEOUT_MS 1000
61 #define OPA_VNIC_SKB_HEADROOM \
62 ALIGN((OPA_VNIC_HDR_LEN + OPA_VNIC_SKB_MDATA_LEN), 8)
64 /* This function is overloaded for opa_vnic specific implementation */
65 static void opa_vnic_get_stats64(struct net_device *netdev,
66 struct rtnl_link_stats64 *stats)
68 struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
69 struct opa_vnic_stats vstats;
71 memset(&vstats, 0, sizeof(vstats));
72 spin_lock(&adapter->stats_lock);
73 adapter->rn_ops->ndo_get_stats64(netdev, &vstats.netstats);
74 spin_unlock(&adapter->stats_lock);
75 memcpy(stats, &vstats.netstats, sizeof(*stats));
78 /* opa_netdev_start_xmit - transmit function */
79 static netdev_tx_t opa_netdev_start_xmit(struct sk_buff *skb,
80 struct net_device *netdev)
82 struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
84 v_dbg("xmit: queue %d skb len %d\n", skb->queue_mapping, skb->len);
85 /* pad to ensure mininum ethernet packet length */
86 if (unlikely(skb->len < ETH_ZLEN)) {
87 if (skb_padto(skb, ETH_ZLEN))
90 skb_put(skb, ETH_ZLEN - skb->len);
93 opa_vnic_encap_skb(adapter, skb);
94 return adapter->rn_ops->ndo_start_xmit(skb, netdev);
97 static u16 opa_vnic_select_queue(struct net_device *netdev, struct sk_buff *skb,
99 select_queue_fallback_t fallback)
101 struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
102 struct opa_vnic_skb_mdata *mdata;
105 /* pass entropy and vl as metadata in skb */
106 mdata = skb_push(skb, sizeof(*mdata));
107 mdata->entropy = opa_vnic_calc_entropy(adapter, skb);
108 mdata->vl = opa_vnic_get_vl(adapter, skb);
109 rc = adapter->rn_ops->ndo_select_queue(netdev, skb,
110 accel_priv, fallback);
111 skb_pull(skb, sizeof(*mdata));
115 /* opa_vnic_process_vema_config - process vema configuration updates */
116 void opa_vnic_process_vema_config(struct opa_vnic_adapter *adapter)
118 struct __opa_veswport_info *info = &adapter->info;
119 struct rdma_netdev *rn = netdev_priv(adapter->netdev);
120 u8 port_num[OPA_VESW_MAX_NUM_DEF_PORT] = { 0 };
121 struct net_device *netdev = adapter->netdev;
122 u8 i, port_count = 0;
125 /* If the base_mac_addr is changed, update the interface mac address */
126 if (memcmp(info->vport.base_mac_addr, adapter->vema_mac_addr,
127 ARRAY_SIZE(info->vport.base_mac_addr))) {
128 struct sockaddr saddr;
130 memcpy(saddr.sa_data, info->vport.base_mac_addr,
131 ARRAY_SIZE(info->vport.base_mac_addr));
132 mutex_lock(&adapter->lock);
133 eth_mac_addr(netdev, &saddr);
134 memcpy(adapter->vema_mac_addr,
135 info->vport.base_mac_addr, ETH_ALEN);
136 mutex_unlock(&adapter->lock);
139 rn->set_id(netdev, info->vesw.vesw_id);
141 /* Handle MTU limit change */
143 netdev->max_mtu = max_t(unsigned int, info->vesw.eth_mtu_non_vlan,
145 if (netdev->mtu > netdev->max_mtu)
146 dev_set_mtu(netdev, netdev->max_mtu);
149 /* Update flow to default port redirection table */
150 port_mask = info->vesw.def_port_mask;
151 for (i = 0; i < OPA_VESW_MAX_NUM_DEF_PORT; i++) {
153 port_num[port_count++] = i;
158 * Build the flow table. Flow table is required when destination LID
159 * is not available. Up to OPA_VNIC_FLOW_TBL_SIZE flows supported.
160 * Each flow need a default port number to get its dlid from the
161 * u_ucast_dlid array.
163 for (i = 0; i < OPA_VNIC_FLOW_TBL_SIZE; i++)
164 adapter->flow_tbl[i] = port_count ? port_num[i % port_count] :
165 OPA_VNIC_INVALID_PORT;
167 /* Operational state can only be DROP_ALL or FORWARDING */
168 if (info->vport.config_state == OPA_VNIC_STATE_FORWARDING) {
169 info->vport.oper_state = OPA_VNIC_STATE_FORWARDING;
170 netif_dormant_off(netdev);
172 info->vport.oper_state = OPA_VNIC_STATE_DROP_ALL;
173 netif_dormant_on(netdev);
178 * Set the power on default values in adapter's vema interface structure.
180 static inline void opa_vnic_set_pod_values(struct opa_vnic_adapter *adapter)
182 adapter->info.vport.max_mac_tbl_ent = OPA_VNIC_MAC_TBL_MAX_ENTRIES;
183 adapter->info.vport.max_smac_ent = OPA_VNIC_MAX_SMAC_LIMIT;
184 adapter->info.vport.config_state = OPA_VNIC_STATE_DROP_ALL;
185 adapter->info.vport.eth_link_status = OPA_VNIC_ETH_LINK_DOWN;
188 /* opa_vnic_set_mac_addr - change mac address */
189 static int opa_vnic_set_mac_addr(struct net_device *netdev, void *addr)
191 struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
192 struct sockaddr *sa = addr;
195 if (!memcmp(netdev->dev_addr, sa->sa_data, ETH_ALEN))
198 mutex_lock(&adapter->lock);
199 rc = eth_mac_addr(netdev, addr);
200 mutex_unlock(&adapter->lock);
204 adapter->info.vport.uc_macs_gen_count++;
205 opa_vnic_vema_report_event(adapter,
206 OPA_VESWPORT_TRAP_IFACE_UCAST_MAC_CHANGE);
211 * opa_vnic_mac_send_event - post event on possible mac list exchange
212 * Send trap when digest from uc/mc mac list differs from previous run.
213 * Digest is evaluated similar to how cksum does.
215 static void opa_vnic_mac_send_event(struct net_device *netdev, u8 event)
217 struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
218 struct netdev_hw_addr *ha;
219 struct netdev_hw_addr_list *hw_list;
224 case OPA_VESWPORT_TRAP_IFACE_UCAST_MAC_CHANGE:
225 hw_list = &netdev->uc;
226 adapter->info.vport.uc_macs_gen_count++;
227 ref_crc = &adapter->umac_hash;
229 case OPA_VESWPORT_TRAP_IFACE_MCAST_MAC_CHANGE:
230 hw_list = &netdev->mc;
231 adapter->info.vport.mc_macs_gen_count++;
232 ref_crc = &adapter->mmac_hash;
237 netdev_hw_addr_list_for_each(ha, hw_list) {
238 crc = crc32_le(crc, ha->addr, ETH_ALEN);
240 l = netdev_hw_addr_list_count(hw_list) * ETH_ALEN;
241 crc = ~crc32_le(crc, (void *)&l, sizeof(l));
243 if (crc != *ref_crc) {
245 opa_vnic_vema_report_event(adapter, event);
249 /* opa_vnic_set_rx_mode - handle uc/mc mac list change */
250 static void opa_vnic_set_rx_mode(struct net_device *netdev)
252 opa_vnic_mac_send_event(netdev,
253 OPA_VESWPORT_TRAP_IFACE_UCAST_MAC_CHANGE);
255 opa_vnic_mac_send_event(netdev,
256 OPA_VESWPORT_TRAP_IFACE_MCAST_MAC_CHANGE);
259 /* opa_netdev_open - activate network interface */
260 static int opa_netdev_open(struct net_device *netdev)
262 struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
265 rc = adapter->rn_ops->ndo_open(adapter->netdev);
267 v_dbg("open failed %d\n", rc);
271 /* Update eth link status and send trap */
272 adapter->info.vport.eth_link_status = OPA_VNIC_ETH_LINK_UP;
273 opa_vnic_vema_report_event(adapter,
274 OPA_VESWPORT_TRAP_ETH_LINK_STATUS_CHANGE);
278 /* opa_netdev_close - disable network interface */
279 static int opa_netdev_close(struct net_device *netdev)
281 struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
284 rc = adapter->rn_ops->ndo_stop(adapter->netdev);
286 v_dbg("close failed %d\n", rc);
290 /* Update eth link status and send trap */
291 adapter->info.vport.eth_link_status = OPA_VNIC_ETH_LINK_DOWN;
292 opa_vnic_vema_report_event(adapter,
293 OPA_VESWPORT_TRAP_ETH_LINK_STATUS_CHANGE);
298 static const struct net_device_ops opa_netdev_ops = {
299 .ndo_open = opa_netdev_open,
300 .ndo_stop = opa_netdev_close,
301 .ndo_start_xmit = opa_netdev_start_xmit,
302 .ndo_get_stats64 = opa_vnic_get_stats64,
303 .ndo_set_rx_mode = opa_vnic_set_rx_mode,
304 .ndo_select_queue = opa_vnic_select_queue,
305 .ndo_set_mac_address = opa_vnic_set_mac_addr,
308 /* opa_vnic_add_netdev - create vnic netdev interface */
309 struct opa_vnic_adapter *opa_vnic_add_netdev(struct ib_device *ibdev,
310 u8 port_num, u8 vport_num)
312 struct opa_vnic_adapter *adapter;
313 struct net_device *netdev;
314 struct rdma_netdev *rn;
317 netdev = ibdev->alloc_rdma_netdev(ibdev, port_num,
318 RDMA_NETDEV_OPA_VNIC,
319 "veth%d", NET_NAME_UNKNOWN,
322 return ERR_PTR(-ENOMEM);
323 else if (IS_ERR(netdev))
324 return ERR_CAST(netdev);
326 rn = netdev_priv(netdev);
327 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
333 rn->clnt_priv = adapter;
335 rn->port_num = port_num;
336 adapter->netdev = netdev;
337 adapter->ibdev = ibdev;
338 adapter->port_num = port_num;
339 adapter->vport_num = vport_num;
340 adapter->rn_ops = netdev->netdev_ops;
342 netdev->netdev_ops = &opa_netdev_ops;
343 netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
344 netdev->hard_header_len += OPA_VNIC_SKB_HEADROOM;
345 mutex_init(&adapter->lock);
346 mutex_init(&adapter->mactbl_lock);
347 spin_lock_init(&adapter->stats_lock);
349 SET_NETDEV_DEV(netdev, ibdev->dev.parent);
351 opa_vnic_set_ethtool_ops(netdev);
353 opa_vnic_set_pod_values(adapter);
355 rc = register_netdev(netdev);
359 netif_carrier_off(netdev);
360 netif_dormant_on(netdev);
361 v_info("initialized\n");
365 mutex_destroy(&adapter->lock);
366 mutex_destroy(&adapter->mactbl_lock);
369 rn->free_rdma_netdev(netdev);
374 /* opa_vnic_rem_netdev - remove vnic netdev interface */
375 void opa_vnic_rem_netdev(struct opa_vnic_adapter *adapter)
377 struct net_device *netdev = adapter->netdev;
378 struct rdma_netdev *rn = netdev_priv(netdev);
380 v_info("removing\n");
381 unregister_netdev(netdev);
382 opa_vnic_release_mac_tbl(adapter);
383 mutex_destroy(&adapter->lock);
384 mutex_destroy(&adapter->mactbl_lock);
386 rn->free_rdma_netdev(netdev);