1 /* 2 * Copyright (c) 2007, 2014 Mellanox Technologies. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 * 32 */ 33 34 #define LINUXKPI_PARAM_PREFIX mlx4_ 35 36 #include <linux/module.h> 37 #include <linux/delay.h> 38 #include <linux/netdevice.h> 39 #include <linux/slab.h> 40 41 #include <dev/mlx4/driver.h> 42 #include <dev/mlx4/device.h> 43 #include <dev/mlx4/cmd.h> 44 45 #include "en.h" 46 47 /* Mellanox ConnectX HCA Ethernet driver */ 48 49 #define MLX4_EN_PARM_INT(X, def_val, desc) \ 50 static unsigned int X = def_val;\ 51 module_param(X , uint, 0444); \ 52 MODULE_PARM_DESC(X, desc); 53 54 55 /* 56 * Device scope module parameters 57 */ 58 59 /* Enable RSS UDP traffic */ 60 MLX4_EN_PARM_INT(udp_rss, 1, 61 "Enable RSS for incoming UDP traffic"); 62 63 /* Priority pausing */ 64 MLX4_EN_PARM_INT(pfctx, 0, "Priority based Flow Control policy on TX[7:0]." 65 " Per priority bit mask"); 66 MLX4_EN_PARM_INT(pfcrx, 0, "Priority based Flow Control policy on RX[7:0]." 67 " Per priority bit mask"); 68 69 #define MAX_PFC_TX 0xff 70 #define MAX_PFC_RX 0xff 71 72 73 static int mlx4_en_get_profile(struct mlx4_en_dev *mdev) 74 { 75 struct mlx4_en_profile *params = &mdev->profile; 76 int i; 77 78 params->udp_rss = udp_rss; 79 params->num_tx_rings_p_up = min_t(int, mp_ncpus, 80 MLX4_EN_MAX_TX_RING_P_UP); 81 if (params->udp_rss && !(mdev->dev->caps.flags 82 & MLX4_DEV_CAP_FLAG_UDP_RSS)) { 83 mlx4_warn(mdev, "UDP RSS is not supported on this device.\n"); 84 params->udp_rss = 0; 85 } 86 for (i = 1; i <= MLX4_MAX_PORTS; i++) { 87 params->prof[i].rx_pause = 1; 88 params->prof[i].rx_ppp = pfcrx; 89 params->prof[i].tx_pause = 1; 90 params->prof[i].tx_ppp = pfctx; 91 params->prof[i].tx_ring_size = MLX4_EN_DEF_TX_RING_SIZE; 92 params->prof[i].rx_ring_size = MLX4_EN_DEF_RX_RING_SIZE; 93 params->prof[i].tx_ring_num = params->num_tx_rings_p_up * 94 MLX4_EN_NUM_UP; 95 params->prof[i].rss_rings = 0; 96 } 97 98 return 0; 99 } 100 101 static void *mlx4_en_get_netdev(struct mlx4_dev *dev, void *ctx, u8 port) 102 { 103 struct mlx4_en_dev *endev = ctx; 104 105 return endev->pndev[port]; 106 } 107 108 static void mlx4_en_event(struct mlx4_dev *dev, void *endev_ptr, 109 enum mlx4_dev_event event, unsigned long port) 110 { 111 struct mlx4_en_dev *mdev = (struct mlx4_en_dev *) endev_ptr; 112 struct mlx4_en_priv *priv; 113 114 switch (event) { 115 case MLX4_DEV_EVENT_PORT_UP: 116 case MLX4_DEV_EVENT_PORT_DOWN: 117 if (!mdev->pndev[port]) 118 return; 119 priv = netdev_priv(mdev->pndev[port]); 120 /* To prevent races, we poll the link state in a separate 121 task rather than changing it here */ 122 priv->link_state = event; 123 queue_work(mdev->workqueue, &priv->linkstate_task); 124 break; 125 126 case MLX4_DEV_EVENT_CATASTROPHIC_ERROR: 127 mlx4_err(mdev, "Internal error detected, restarting device\n"); 128 break; 129 130 case MLX4_DEV_EVENT_SLAVE_INIT: 131 case MLX4_DEV_EVENT_SLAVE_SHUTDOWN: 132 break; 133 default: 134 if (port < 1 || port > dev->caps.num_ports || 135 !mdev->pndev[port]) 136 return; 137 mlx4_warn(mdev, "Unhandled event %d for port %d\n", event, 138 (int) port); 139 } 140 } 141 142 static void mlx4_en_remove(struct mlx4_dev *dev, void *endev_ptr) 143 { 144 struct mlx4_en_dev *mdev = endev_ptr; 145 int i, ret; 146 147 mutex_lock(&mdev->state_lock); 148 mdev->device_up = false; 149 mutex_unlock(&mdev->state_lock); 150 151 mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) 152 if (mdev->pndev[i]) 153 mlx4_en_destroy_netdev(mdev->pndev[i]); 154 155 flush_workqueue(mdev->workqueue); 156 destroy_workqueue(mdev->workqueue); 157 ret = mlx4_mr_free(dev, &mdev->mr); 158 if (ret) 159 mlx4_err(mdev, "Error deregistering MR. The system may have become unstable."); 160 iounmap(mdev->uar_map); 161 mlx4_uar_free(dev, &mdev->priv_uar); 162 mlx4_pd_free(dev, mdev->priv_pdn); 163 kfree(mdev); 164 } 165 166 static void *mlx4_en_add(struct mlx4_dev *dev) 167 { 168 struct mlx4_en_dev *mdev; 169 int i; 170 int err; 171 172 mdev = kzalloc(sizeof *mdev, GFP_KERNEL); 173 if (!mdev) { 174 dev_err(&dev->pdev->dev, "Device struct alloc failed, " 175 "aborting.\n"); 176 err = -ENOMEM; 177 goto err_free_res; 178 } 179 180 if (mlx4_pd_alloc(dev, &mdev->priv_pdn)) 181 goto err_free_dev; 182 183 if (mlx4_uar_alloc(dev, &mdev->priv_uar)) 184 goto err_pd; 185 186 mdev->uar_map = ioremap((phys_addr_t) mdev->priv_uar.pfn << PAGE_SHIFT, 187 PAGE_SIZE); 188 if (!mdev->uar_map) 189 goto err_uar; 190 spin_lock_init(&mdev->uar_lock); 191 192 mdev->dev = dev; 193 mdev->dma_device = &(dev->pdev->dev); 194 mdev->pdev = dev->pdev; 195 mdev->device_up = false; 196 197 mdev->LSO_support = !!(dev->caps.flags & (1 << 15)); 198 if (!mdev->LSO_support) 199 mlx4_warn(mdev, "LSO not supported, please upgrade to later " 200 "FW version to enable LSO\n"); 201 202 if (mlx4_mr_alloc(mdev->dev, mdev->priv_pdn, 0, ~0ull, 203 MLX4_PERM_LOCAL_WRITE | MLX4_PERM_LOCAL_READ, 204 0, 0, &mdev->mr)) { 205 mlx4_err(mdev, "Failed allocating memory region\n"); 206 goto err_map; 207 } 208 if (mlx4_mr_enable(mdev->dev, &mdev->mr)) { 209 mlx4_err(mdev, "Failed enabling memory region\n"); 210 goto err_mr; 211 } 212 213 /* Build device profile according to supplied module parameters */ 214 err = mlx4_en_get_profile(mdev); 215 if (err) { 216 mlx4_err(mdev, "Bad module parameters, aborting.\n"); 217 goto err_mr; 218 } 219 220 /* Configure which ports to start according to module parameters */ 221 mdev->port_cnt = 0; 222 mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) 223 mdev->port_cnt++; 224 225 226 mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) { 227 if (!dev->caps.comp_pool) { 228 mdev->profile.prof[i].rx_ring_num = 229 rounddown_pow_of_two(max_t(int, MIN_RX_RINGS, 230 min_t(int, 231 dev->caps.num_comp_vectors, 232 DEF_RX_RINGS))); 233 } else { 234 mdev->profile.prof[i].rx_ring_num = rounddown_pow_of_two( 235 min_t(int, dev->caps.comp_pool / 236 dev->caps.num_ports, MAX_MSIX_P_PORT)); 237 } 238 } 239 240 /* Create our own workqueue for reset/multicast tasks 241 * Note: we cannot use the shared workqueue because of deadlocks caused 242 * by the rtnl lock */ 243 mdev->workqueue = create_singlethread_workqueue("mlx4_en"); 244 if (!mdev->workqueue) { 245 err = -ENOMEM; 246 goto err_mr; 247 } 248 249 /* At this stage all non-port specific tasks are complete: 250 * mark the card state as up */ 251 mutex_init(&mdev->state_lock); 252 mdev->device_up = true; 253 254 /* Setup ports */ 255 256 /* Create a netdev for each port */ 257 mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) { 258 mlx4_info(mdev, "Activating port:%d\n", i); 259 if (mlx4_en_init_netdev(mdev, i, &mdev->profile.prof[i])) 260 mdev->pndev[i] = NULL; 261 } 262 263 return mdev; 264 265 err_mr: 266 err = mlx4_mr_free(dev, &mdev->mr); 267 if (err) 268 mlx4_err(mdev, "Error deregistering MR. The system may have become unstable."); 269 err_map: 270 if (mdev->uar_map) 271 iounmap(mdev->uar_map); 272 err_uar: 273 mlx4_uar_free(dev, &mdev->priv_uar); 274 err_pd: 275 mlx4_pd_free(dev, mdev->priv_pdn); 276 err_free_dev: 277 kfree(mdev); 278 err_free_res: 279 return NULL; 280 } 281 282 static struct mlx4_interface mlx4_en_interface = { 283 .add = mlx4_en_add, 284 .remove = mlx4_en_remove, 285 .event = mlx4_en_event, 286 .get_dev = mlx4_en_get_netdev, 287 .protocol = MLX4_PROT_ETH, 288 }; 289 290 static void mlx4_en_verify_params(void) 291 { 292 if (pfctx > MAX_PFC_TX) { 293 pr_warn("mlx4_en: WARNING: illegal module parameter pfctx 0x%x - " 294 "should be in range 0-0x%x, will be changed to default (0)\n", 295 pfctx, MAX_PFC_TX); 296 pfctx = 0; 297 } 298 299 if (pfcrx > MAX_PFC_RX) { 300 pr_warn("mlx4_en: WARNING: illegal module parameter pfcrx 0x%x - " 301 "should be in range 0-0x%x, will be changed to default (0)\n", 302 pfcrx, MAX_PFC_RX); 303 pfcrx = 0; 304 } 305 } 306 307 308 static int __init mlx4_en_init(void) 309 { 310 mlx4_en_verify_params(); 311 312 #ifdef CONFIG_DEBUG_FS 313 int err = 0; 314 err = mlx4_en_register_debugfs(); 315 if (err) 316 pr_err(KERN_ERR "Failed to register debugfs\n"); 317 #endif 318 return mlx4_register_interface(&mlx4_en_interface); 319 } 320 321 static void __exit mlx4_en_cleanup(void) 322 { 323 mlx4_unregister_interface(&mlx4_en_interface); 324 #ifdef CONFIG_DEBUG_FS 325 mlx4_en_unregister_debugfs(); 326 #endif 327 } 328 329 module_init(mlx4_en_init); 330 module_exit(mlx4_en_cleanup); 331 332 static int 333 mlx4en_evhand(module_t mod, int event, void *arg) 334 { 335 return (0); 336 } 337 static moduledata_t mlx4en_mod = { 338 .name = "mlx4en", 339 .evhand = mlx4en_evhand, 340 }; 341 DECLARE_MODULE(mlx4en, mlx4en_mod, SI_SUB_OFED_PREINIT, SI_ORDER_ANY); 342 MODULE_DEPEND(mlx4en, mlx4, 1, 1, 1); 343 MODULE_DEPEND(mlx4en, linuxkpi, 1, 1, 1); 344