1 /* Broadcom NetXtreme-C/E network driver. 2 * 3 * Copyright (c) 2016 Broadcom Limited 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation. 8 */ 9 10 #include <linux/module.h> 11 12 #include <linux/kernel.h> 13 #include <linux/errno.h> 14 #include <linux/interrupt.h> 15 #include <linux/pci.h> 16 #include <linux/netdevice.h> 17 #include <linux/rtnetlink.h> 18 #include <linux/bitops.h> 19 #include <linux/irq.h> 20 #include <asm/byteorder.h> 21 #include <linux/bitmap.h> 22 23 #include "bnxt_hsi.h" 24 #include "bnxt.h" 25 #include "bnxt_ulp.h" 26 27 static int bnxt_register_dev(struct bnxt_en_dev *edev, int ulp_id, 28 struct bnxt_ulp_ops *ulp_ops, void *handle) 29 { 30 struct net_device *dev = edev->net; 31 struct bnxt *bp = netdev_priv(dev); 32 struct bnxt_ulp *ulp; 33 34 ASSERT_RTNL(); 35 if (ulp_id >= BNXT_MAX_ULP) 36 return -EINVAL; 37 38 ulp = &edev->ulp_tbl[ulp_id]; 39 if (rcu_access_pointer(ulp->ulp_ops)) { 40 netdev_err(bp->dev, "ulp id %d already registered\n", ulp_id); 41 return -EBUSY; 42 } 43 if (ulp_id == BNXT_ROCE_ULP) { 44 unsigned int max_stat_ctxs; 45 46 max_stat_ctxs = bnxt_get_max_func_stat_ctxs(bp); 47 if (max_stat_ctxs <= BNXT_MIN_ROCE_STAT_CTXS || 48 bp->num_stat_ctxs == max_stat_ctxs) 49 return -ENOMEM; 50 bnxt_set_max_func_stat_ctxs(bp, max_stat_ctxs - 51 BNXT_MIN_ROCE_STAT_CTXS); 52 } 53 54 atomic_set(&ulp->ref_count, 0); 55 ulp->handle = handle; 56 rcu_assign_pointer(ulp->ulp_ops, ulp_ops); 57 58 if (ulp_id == BNXT_ROCE_ULP) { 59 if (test_bit(BNXT_STATE_OPEN, &bp->state)) 60 bnxt_hwrm_vnic_cfg(bp, 0); 61 } 62 63 return 0; 64 } 65 66 static int bnxt_unregister_dev(struct bnxt_en_dev *edev, int ulp_id) 67 { 68 struct net_device *dev = edev->net; 69 struct bnxt *bp = netdev_priv(dev); 70 struct bnxt_ulp *ulp; 71 int i = 0; 72 73 ASSERT_RTNL(); 74 if (ulp_id >= BNXT_MAX_ULP) 75 return -EINVAL; 76 77 ulp = &edev->ulp_tbl[ulp_id]; 78 if (!rcu_access_pointer(ulp->ulp_ops)) { 79 netdev_err(bp->dev, "ulp id %d not registered\n", ulp_id); 80 return -EINVAL; 81 } 82 if (ulp_id == BNXT_ROCE_ULP) { 83 unsigned int max_stat_ctxs; 84 85 max_stat_ctxs = bnxt_get_max_func_stat_ctxs(bp); 86 bnxt_set_max_func_stat_ctxs(bp, max_stat_ctxs + 1); 87 if (ulp->msix_requested) 88 edev->en_ops->bnxt_free_msix(edev, ulp_id); 89 } 90 if (ulp->max_async_event_id) 91 bnxt_hwrm_func_rgtr_async_events(bp, NULL, 0); 92 93 RCU_INIT_POINTER(ulp->ulp_ops, NULL); 94 synchronize_rcu(); 95 ulp->max_async_event_id = 0; 96 ulp->async_events_bmap = NULL; 97 while (atomic_read(&ulp->ref_count) != 0 && i < 10) { 98 msleep(100); 99 i++; 100 } 101 return 0; 102 } 103 104 static int bnxt_req_msix_vecs(struct bnxt_en_dev *edev, int ulp_id, 105 struct bnxt_msix_entry *ent, int num_msix) 106 { 107 struct net_device *dev = edev->net; 108 struct bnxt *bp = netdev_priv(dev); 109 int max_idx, max_cp_rings; 110 int avail_msix, i, idx; 111 112 ASSERT_RTNL(); 113 if (ulp_id != BNXT_ROCE_ULP) 114 return -EINVAL; 115 116 if (!(bp->flags & BNXT_FLAG_USING_MSIX)) 117 return -ENODEV; 118 119 max_cp_rings = bnxt_get_max_func_cp_rings(bp); 120 max_idx = min_t(int, bp->total_irqs, max_cp_rings); 121 avail_msix = max_idx - bp->cp_nr_rings; 122 if (!avail_msix) 123 return -ENOMEM; 124 if (avail_msix > num_msix) 125 avail_msix = num_msix; 126 127 idx = max_idx - avail_msix; 128 for (i = 0; i < avail_msix; i++) { 129 ent[i].vector = bp->irq_tbl[idx + i].vector; 130 ent[i].ring_idx = idx + i; 131 ent[i].db_offset = (idx + i) * 0x80; 132 } 133 bnxt_set_max_func_irqs(bp, max_idx - avail_msix); 134 bnxt_set_max_func_cp_rings(bp, max_cp_rings - avail_msix); 135 edev->ulp_tbl[ulp_id].msix_requested = avail_msix; 136 return avail_msix; 137 } 138 139 static int bnxt_free_msix_vecs(struct bnxt_en_dev *edev, int ulp_id) 140 { 141 struct net_device *dev = edev->net; 142 struct bnxt *bp = netdev_priv(dev); 143 int max_cp_rings, msix_requested; 144 145 ASSERT_RTNL(); 146 if (ulp_id != BNXT_ROCE_ULP) 147 return -EINVAL; 148 149 max_cp_rings = bnxt_get_max_func_cp_rings(bp); 150 msix_requested = edev->ulp_tbl[ulp_id].msix_requested; 151 bnxt_set_max_func_cp_rings(bp, max_cp_rings + msix_requested); 152 edev->ulp_tbl[ulp_id].msix_requested = 0; 153 bnxt_set_max_func_irqs(bp, bp->total_irqs); 154 return 0; 155 } 156 157 void bnxt_subtract_ulp_resources(struct bnxt *bp, int ulp_id) 158 { 159 ASSERT_RTNL(); 160 if (bnxt_ulp_registered(bp->edev, ulp_id)) { 161 struct bnxt_en_dev *edev = bp->edev; 162 unsigned int msix_req, max; 163 164 msix_req = edev->ulp_tbl[ulp_id].msix_requested; 165 max = bnxt_get_max_func_cp_rings(bp); 166 bnxt_set_max_func_cp_rings(bp, max - msix_req); 167 max = bnxt_get_max_func_stat_ctxs(bp); 168 bnxt_set_max_func_stat_ctxs(bp, max - 1); 169 } 170 } 171 172 static int bnxt_send_msg(struct bnxt_en_dev *edev, int ulp_id, 173 struct bnxt_fw_msg *fw_msg) 174 { 175 struct net_device *dev = edev->net; 176 struct bnxt *bp = netdev_priv(dev); 177 struct input *req; 178 int rc; 179 180 mutex_lock(&bp->hwrm_cmd_lock); 181 req = fw_msg->msg; 182 req->resp_addr = cpu_to_le64(bp->hwrm_cmd_resp_dma_addr); 183 rc = _hwrm_send_message(bp, fw_msg->msg, fw_msg->msg_len, 184 fw_msg->timeout); 185 if (!rc) { 186 struct output *resp = bp->hwrm_cmd_resp_addr; 187 u32 len = le16_to_cpu(resp->resp_len); 188 189 if (fw_msg->resp_max_len < len) 190 len = fw_msg->resp_max_len; 191 192 memcpy(fw_msg->resp, resp, len); 193 } 194 mutex_unlock(&bp->hwrm_cmd_lock); 195 return rc; 196 } 197 198 static void bnxt_ulp_get(struct bnxt_ulp *ulp) 199 { 200 atomic_inc(&ulp->ref_count); 201 } 202 203 static void bnxt_ulp_put(struct bnxt_ulp *ulp) 204 { 205 atomic_dec(&ulp->ref_count); 206 } 207 208 void bnxt_ulp_stop(struct bnxt *bp) 209 { 210 struct bnxt_en_dev *edev = bp->edev; 211 struct bnxt_ulp_ops *ops; 212 int i; 213 214 if (!edev) 215 return; 216 217 for (i = 0; i < BNXT_MAX_ULP; i++) { 218 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 219 220 ops = rtnl_dereference(ulp->ulp_ops); 221 if (!ops || !ops->ulp_stop) 222 continue; 223 ops->ulp_stop(ulp->handle); 224 } 225 } 226 227 void bnxt_ulp_start(struct bnxt *bp) 228 { 229 struct bnxt_en_dev *edev = bp->edev; 230 struct bnxt_ulp_ops *ops; 231 int i; 232 233 if (!edev) 234 return; 235 236 for (i = 0; i < BNXT_MAX_ULP; i++) { 237 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 238 239 ops = rtnl_dereference(ulp->ulp_ops); 240 if (!ops || !ops->ulp_start) 241 continue; 242 ops->ulp_start(ulp->handle); 243 } 244 } 245 246 void bnxt_ulp_sriov_cfg(struct bnxt *bp, int num_vfs) 247 { 248 struct bnxt_en_dev *edev = bp->edev; 249 struct bnxt_ulp_ops *ops; 250 int i; 251 252 if (!edev) 253 return; 254 255 for (i = 0; i < BNXT_MAX_ULP; i++) { 256 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 257 258 rcu_read_lock(); 259 ops = rcu_dereference(ulp->ulp_ops); 260 if (!ops || !ops->ulp_sriov_config) { 261 rcu_read_unlock(); 262 continue; 263 } 264 bnxt_ulp_get(ulp); 265 rcu_read_unlock(); 266 ops->ulp_sriov_config(ulp->handle, num_vfs); 267 bnxt_ulp_put(ulp); 268 } 269 } 270 271 void bnxt_ulp_shutdown(struct bnxt *bp) 272 { 273 struct bnxt_en_dev *edev = bp->edev; 274 struct bnxt_ulp_ops *ops; 275 int i; 276 277 if (!edev) 278 return; 279 280 for (i = 0; i < BNXT_MAX_ULP; i++) { 281 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 282 283 ops = rtnl_dereference(ulp->ulp_ops); 284 if (!ops || !ops->ulp_shutdown) 285 continue; 286 ops->ulp_shutdown(ulp->handle); 287 } 288 } 289 290 void bnxt_ulp_async_events(struct bnxt *bp, struct hwrm_async_event_cmpl *cmpl) 291 { 292 u16 event_id = le16_to_cpu(cmpl->event_id); 293 struct bnxt_en_dev *edev = bp->edev; 294 struct bnxt_ulp_ops *ops; 295 int i; 296 297 if (!edev) 298 return; 299 300 rcu_read_lock(); 301 for (i = 0; i < BNXT_MAX_ULP; i++) { 302 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 303 304 ops = rcu_dereference(ulp->ulp_ops); 305 if (!ops || !ops->ulp_async_notifier) 306 continue; 307 if (!ulp->async_events_bmap || 308 event_id > ulp->max_async_event_id) 309 continue; 310 311 /* Read max_async_event_id first before testing the bitmap. */ 312 smp_rmb(); 313 if (test_bit(event_id, ulp->async_events_bmap)) 314 ops->ulp_async_notifier(ulp->handle, cmpl); 315 } 316 rcu_read_unlock(); 317 } 318 319 static int bnxt_register_async_events(struct bnxt_en_dev *edev, int ulp_id, 320 unsigned long *events_bmap, u16 max_id) 321 { 322 struct net_device *dev = edev->net; 323 struct bnxt *bp = netdev_priv(dev); 324 struct bnxt_ulp *ulp; 325 326 if (ulp_id >= BNXT_MAX_ULP) 327 return -EINVAL; 328 329 ulp = &edev->ulp_tbl[ulp_id]; 330 ulp->async_events_bmap = events_bmap; 331 /* Make sure bnxt_ulp_async_events() sees this order */ 332 smp_wmb(); 333 ulp->max_async_event_id = max_id; 334 bnxt_hwrm_func_rgtr_async_events(bp, events_bmap, max_id + 1); 335 return 0; 336 } 337 338 static const struct bnxt_en_ops bnxt_en_ops_tbl = { 339 .bnxt_register_device = bnxt_register_dev, 340 .bnxt_unregister_device = bnxt_unregister_dev, 341 .bnxt_request_msix = bnxt_req_msix_vecs, 342 .bnxt_free_msix = bnxt_free_msix_vecs, 343 .bnxt_send_fw_msg = bnxt_send_msg, 344 .bnxt_register_fw_async_events = bnxt_register_async_events, 345 }; 346 347 struct bnxt_en_dev *bnxt_ulp_probe(struct net_device *dev) 348 { 349 struct bnxt *bp = netdev_priv(dev); 350 struct bnxt_en_dev *edev; 351 352 edev = bp->edev; 353 if (!edev) { 354 edev = kzalloc(sizeof(*edev), GFP_KERNEL); 355 if (!edev) 356 return ERR_PTR(-ENOMEM); 357 edev->en_ops = &bnxt_en_ops_tbl; 358 if (bp->flags & BNXT_FLAG_ROCEV1_CAP) 359 edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP; 360 if (bp->flags & BNXT_FLAG_ROCEV2_CAP) 361 edev->flags |= BNXT_EN_FLAG_ROCEV2_CAP; 362 edev->net = dev; 363 edev->pdev = bp->pdev; 364 bp->edev = edev; 365 } 366 return bp->edev; 367 } 368