1 /* 2 * Copyright (C) 2015-2017 Netronome Systems, Inc. 3 * 4 * This software is dual licensed under the GNU General License Version 2, 5 * June 1991 as shown in the file COPYING in the top-level directory of this 6 * source tree or the BSD 2-Clause License provided below. You have the 7 * option to license this software under the complete terms of either license. 8 * 9 * The BSD 2-Clause License: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * 1. Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 19 * 2. Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials 22 * provided with the distribution. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 31 * SOFTWARE. 32 */ 33 34 #include <linux/bitfield.h> 35 #include <linux/netdevice.h> 36 #include <linux/skbuff.h> 37 #include <linux/workqueue.h> 38 #include <net/dst_metadata.h> 39 40 #include "main.h" 41 #include "../nfp_net.h" 42 #include "../nfp_net_repr.h" 43 #include "./cmsg.h" 44 45 static struct nfp_flower_cmsg_hdr * 46 nfp_flower_cmsg_get_hdr(struct sk_buff *skb) 47 { 48 return (struct nfp_flower_cmsg_hdr *)skb->data; 49 } 50 51 struct sk_buff * 52 nfp_flower_cmsg_alloc(struct nfp_app *app, unsigned int size, 53 enum nfp_flower_cmsg_type_port type, gfp_t flag) 54 { 55 struct nfp_flower_cmsg_hdr *ch; 56 struct sk_buff *skb; 57 58 size += NFP_FLOWER_CMSG_HLEN; 59 60 skb = nfp_app_ctrl_msg_alloc(app, size, flag); 61 if (!skb) 62 return NULL; 63 64 ch = nfp_flower_cmsg_get_hdr(skb); 65 ch->pad = 0; 66 ch->version = NFP_FLOWER_CMSG_VER1; 67 ch->type = type; 68 skb_put(skb, size); 69 70 return skb; 71 } 72 73 struct sk_buff * 74 nfp_flower_cmsg_mac_repr_start(struct nfp_app *app, unsigned int num_ports) 75 { 76 struct nfp_flower_cmsg_mac_repr *msg; 77 struct sk_buff *skb; 78 unsigned int size; 79 80 size = sizeof(*msg) + num_ports * sizeof(msg->ports[0]); 81 skb = nfp_flower_cmsg_alloc(app, size, NFP_FLOWER_CMSG_TYPE_MAC_REPR, 82 GFP_KERNEL); 83 if (!skb) 84 return NULL; 85 86 msg = nfp_flower_cmsg_get_data(skb); 87 memset(msg->reserved, 0, sizeof(msg->reserved)); 88 msg->num_ports = num_ports; 89 90 return skb; 91 } 92 93 void 94 nfp_flower_cmsg_mac_repr_add(struct sk_buff *skb, unsigned int idx, 95 unsigned int nbi, unsigned int nbi_port, 96 unsigned int phys_port) 97 { 98 struct nfp_flower_cmsg_mac_repr *msg; 99 100 msg = nfp_flower_cmsg_get_data(skb); 101 msg->ports[idx].idx = idx; 102 msg->ports[idx].info = nbi & NFP_FLOWER_CMSG_MAC_REPR_NBI; 103 msg->ports[idx].nbi_port = nbi_port; 104 msg->ports[idx].phys_port = phys_port; 105 } 106 107 int nfp_flower_cmsg_portmod(struct nfp_repr *repr, bool carrier_ok, 108 unsigned int mtu, bool mtu_only) 109 { 110 struct nfp_flower_cmsg_portmod *msg; 111 struct sk_buff *skb; 112 113 skb = nfp_flower_cmsg_alloc(repr->app, sizeof(*msg), 114 NFP_FLOWER_CMSG_TYPE_PORT_MOD, GFP_KERNEL); 115 if (!skb) 116 return -ENOMEM; 117 118 msg = nfp_flower_cmsg_get_data(skb); 119 msg->portnum = cpu_to_be32(repr->dst->u.port_info.port_id); 120 msg->reserved = 0; 121 msg->info = carrier_ok; 122 123 if (mtu_only) 124 msg->info |= NFP_FLOWER_CMSG_PORTMOD_MTU_CHANGE_ONLY; 125 126 msg->mtu = cpu_to_be16(mtu); 127 128 nfp_ctrl_tx(repr->app->ctrl, skb); 129 130 return 0; 131 } 132 133 int nfp_flower_cmsg_portreify(struct nfp_repr *repr, bool exists) 134 { 135 struct nfp_flower_cmsg_portreify *msg; 136 struct sk_buff *skb; 137 138 skb = nfp_flower_cmsg_alloc(repr->app, sizeof(*msg), 139 NFP_FLOWER_CMSG_TYPE_PORT_REIFY, 140 GFP_KERNEL); 141 if (!skb) 142 return -ENOMEM; 143 144 msg = nfp_flower_cmsg_get_data(skb); 145 msg->portnum = cpu_to_be32(repr->dst->u.port_info.port_id); 146 msg->reserved = 0; 147 msg->info = cpu_to_be16(exists); 148 149 nfp_ctrl_tx(repr->app->ctrl, skb); 150 151 return 0; 152 } 153 154 static bool 155 nfp_flower_process_mtu_ack(struct nfp_app *app, struct sk_buff *skb) 156 { 157 struct nfp_flower_priv *app_priv = app->priv; 158 struct nfp_flower_cmsg_portmod *msg; 159 160 msg = nfp_flower_cmsg_get_data(skb); 161 162 if (!(msg->info & NFP_FLOWER_CMSG_PORTMOD_MTU_CHANGE_ONLY)) 163 return false; 164 165 spin_lock_bh(&app_priv->mtu_conf.lock); 166 if (!app_priv->mtu_conf.requested_val || 167 app_priv->mtu_conf.portnum != be32_to_cpu(msg->portnum) || 168 be16_to_cpu(msg->mtu) != app_priv->mtu_conf.requested_val) { 169 /* Not an ack for requested MTU change. */ 170 spin_unlock_bh(&app_priv->mtu_conf.lock); 171 return false; 172 } 173 174 app_priv->mtu_conf.ack = true; 175 app_priv->mtu_conf.requested_val = 0; 176 wake_up(&app_priv->mtu_conf.wait_q); 177 spin_unlock_bh(&app_priv->mtu_conf.lock); 178 179 return true; 180 } 181 182 static void 183 nfp_flower_cmsg_portmod_rx(struct nfp_app *app, struct sk_buff *skb) 184 { 185 struct nfp_flower_cmsg_portmod *msg; 186 struct net_device *netdev; 187 bool link; 188 189 msg = nfp_flower_cmsg_get_data(skb); 190 link = msg->info & NFP_FLOWER_CMSG_PORTMOD_INFO_LINK; 191 192 rtnl_lock(); 193 rcu_read_lock(); 194 netdev = nfp_app_repr_get(app, be32_to_cpu(msg->portnum)); 195 rcu_read_unlock(); 196 if (!netdev) { 197 nfp_flower_cmsg_warn(app, "ctrl msg for unknown port 0x%08x\n", 198 be32_to_cpu(msg->portnum)); 199 rtnl_unlock(); 200 return; 201 } 202 203 if (link) { 204 u16 mtu = be16_to_cpu(msg->mtu); 205 206 netif_carrier_on(netdev); 207 208 /* An MTU of 0 from the firmware should be ignored */ 209 if (mtu) 210 dev_set_mtu(netdev, mtu); 211 } else { 212 netif_carrier_off(netdev); 213 } 214 rtnl_unlock(); 215 } 216 217 static void 218 nfp_flower_cmsg_portreify_rx(struct nfp_app *app, struct sk_buff *skb) 219 { 220 struct nfp_flower_priv *priv = app->priv; 221 struct nfp_flower_cmsg_portreify *msg; 222 bool exists; 223 224 msg = nfp_flower_cmsg_get_data(skb); 225 226 rcu_read_lock(); 227 exists = !!nfp_app_repr_get(app, be32_to_cpu(msg->portnum)); 228 rcu_read_unlock(); 229 if (!exists) { 230 nfp_flower_cmsg_warn(app, "ctrl msg for unknown port 0x%08x\n", 231 be32_to_cpu(msg->portnum)); 232 return; 233 } 234 235 atomic_inc(&priv->reify_replies); 236 wake_up_interruptible(&priv->reify_wait_queue); 237 } 238 239 static void 240 nfp_flower_cmsg_process_one_rx(struct nfp_app *app, struct sk_buff *skb) 241 { 242 struct nfp_flower_cmsg_hdr *cmsg_hdr; 243 enum nfp_flower_cmsg_type_port type; 244 245 cmsg_hdr = nfp_flower_cmsg_get_hdr(skb); 246 247 type = cmsg_hdr->type; 248 switch (type) { 249 case NFP_FLOWER_CMSG_TYPE_PORT_REIFY: 250 nfp_flower_cmsg_portreify_rx(app, skb); 251 break; 252 case NFP_FLOWER_CMSG_TYPE_PORT_MOD: 253 nfp_flower_cmsg_portmod_rx(app, skb); 254 break; 255 case NFP_FLOWER_CMSG_TYPE_NO_NEIGH: 256 nfp_tunnel_request_route(app, skb); 257 break; 258 case NFP_FLOWER_CMSG_TYPE_ACTIVE_TUNS: 259 nfp_tunnel_keep_alive(app, skb); 260 break; 261 case NFP_FLOWER_CMSG_TYPE_TUN_NEIGH: 262 /* Acks from the NFP that the route is added - ignore. */ 263 break; 264 default: 265 nfp_flower_cmsg_warn(app, "Cannot handle invalid repr control type %u\n", 266 type); 267 goto out; 268 } 269 270 dev_consume_skb_any(skb); 271 return; 272 out: 273 dev_kfree_skb_any(skb); 274 } 275 276 void nfp_flower_cmsg_process_rx(struct work_struct *work) 277 { 278 struct nfp_flower_priv *priv; 279 struct sk_buff *skb; 280 281 priv = container_of(work, struct nfp_flower_priv, cmsg_work); 282 283 while ((skb = skb_dequeue(&priv->cmsg_skbs))) 284 nfp_flower_cmsg_process_one_rx(priv->app, skb); 285 } 286 287 void nfp_flower_cmsg_rx(struct nfp_app *app, struct sk_buff *skb) 288 { 289 struct nfp_flower_priv *priv = app->priv; 290 struct nfp_flower_cmsg_hdr *cmsg_hdr; 291 292 cmsg_hdr = nfp_flower_cmsg_get_hdr(skb); 293 294 if (unlikely(cmsg_hdr->version != NFP_FLOWER_CMSG_VER1)) { 295 nfp_flower_cmsg_warn(app, "Cannot handle repr control version %u\n", 296 cmsg_hdr->version); 297 dev_kfree_skb_any(skb); 298 return; 299 } 300 301 if (cmsg_hdr->type == NFP_FLOWER_CMSG_TYPE_FLOW_STATS) { 302 /* We need to deal with stats updates from HW asap */ 303 nfp_flower_rx_flow_stats(app, skb); 304 dev_consume_skb_any(skb); 305 } else if (cmsg_hdr->type == NFP_FLOWER_CMSG_TYPE_PORT_MOD && 306 nfp_flower_process_mtu_ack(app, skb)) { 307 /* Handle MTU acks outside wq to prevent RTNL conflict. */ 308 dev_consume_skb_any(skb); 309 } else { 310 skb_queue_tail(&priv->cmsg_skbs, skb); 311 schedule_work(&priv->cmsg_work); 312 } 313 } 314