1 /* 2 * Copyright (C) 2013 Universita` di Pisa. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 */ 25 26 #include <sys/types.h> 27 #include <sys/module.h> 28 #include <sys/errno.h> 29 #include <sys/param.h> /* defines used in kernel.h */ 30 #include <sys/kernel.h> /* types used in module initialization */ 31 #include <sys/conf.h> /* DEV_MODULE */ 32 33 #include <sys/devfs.h> 34 35 #include <vm/vm.h> /* vtophys */ 36 #include <vm/pmap.h> /* vtophys */ 37 #include <vm/vm_param.h> 38 #include <vm/vm_object.h> 39 #include <vm/vm_page.h> 40 #include <vm/vm_page2.h> 41 #include <vm/vm_pager.h> 42 43 44 #include <sys/malloc.h> 45 #include <sys/socket.h> /* sockaddrs */ 46 #include <sys/event.h> 47 #include <net/if.h> 48 #include <net/if_var.h> 49 #include <sys/bus.h> /* bus_dmamap_* */ 50 51 #include <net/netmap.h> 52 #include <net/netmap/netmap_kern.h> 53 #include <net/netmap/netmap_mem2.h> 54 55 56 /* ======================== FREEBSD-SPECIFIC ROUTINES ================== */ 57 58 /* 59 * Intercept the rx routine in the standard device driver. 60 * Second argument is non-zero to intercept, 0 to restore 61 */ 62 int 63 netmap_catch_rx(struct netmap_adapter *na, int intercept) 64 { 65 struct netmap_generic_adapter *gna = (struct netmap_generic_adapter *)na; 66 struct ifnet *ifp = na->ifp; 67 68 if (intercept) { 69 if (gna->save_if_input) { 70 D("cannot intercept again"); 71 return EINVAL; /* already set */ 72 } 73 gna->save_if_input = ifp->if_input; 74 ifp->if_input = generic_rx_handler; 75 } else { 76 if (!gna->save_if_input){ 77 D("cannot restore"); 78 return EINVAL; /* not saved */ 79 } 80 ifp->if_input = gna->save_if_input; 81 gna->save_if_input = NULL; 82 } 83 84 return 0; 85 } 86 87 /* 88 * Intercept the packet steering routine in the tx path, 89 * so that we can decide which queue is used for an mbuf. 90 * Second argument is non-zero to intercept, 0 to restore. 91 * 92 * XXX see if FreeBSD has such a mechanism 93 */ 94 void 95 netmap_catch_packet_steering(struct netmap_generic_adapter *na, int enable) 96 { 97 if (enable) { 98 } else { 99 } 100 } 101 102 /* Transmit routine used by generic_netmap_txsync(). Returns 0 on success 103 * and non-zero on error (which may be packet drops or other errors). 104 * addr and len identify the netmap buffer, m is the (preallocated) 105 * mbuf to use for transmissions. 106 * 107 * We should add a reference to the mbuf so the m_freem() at the end 108 * of the transmission does not consume resources. 109 * 110 * On FreeBSD, and on multiqueue cards, we can force the queue using 111 * if ((m->m_flags & M_FLOWID) != 0) 112 * i = m->m_pkthdr.flowid % adapter->num_queues; 113 * else 114 * i = curcpu % adapter->num_queues; 115 * 116 */ 117 int 118 generic_xmit_frame(struct ifnet *ifp, struct mbuf *m, 119 void *addr, u_int len, u_int ring_nr) 120 { 121 int ret; 122 123 m->m_len = m->m_pkthdr.len = 0; 124 125 // copy data to the mbuf 126 m_copyback(m, 0, len, addr); 127 128 #if 0 129 // inc refcount. We are alone, so we can skip the atomic 130 atomic_fetchadd_int(m->m_ext.ref_cnt, 1); 131 m->m_flags |= M_FLOWID; 132 #endif 133 m->m_pkthdr.hash = ring_nr; /* XXX probably not accurate */ 134 m->m_pkthdr.rcvif = ifp; /* used for tx notification */ 135 ret = ifp->if_transmit(ifp, m); 136 return ret; 137 } 138 139 /* 140 * The following two functions are empty until we have a generic 141 * way to extract the info from the ifp 142 */ 143 int 144 generic_find_num_desc(struct ifnet *ifp, unsigned int *tx, unsigned int *rx) 145 { 146 D("called"); 147 return 0; 148 } 149 150 void 151 generic_find_num_queues(struct ifnet *ifp, u_int *txq, u_int *rxq) 152 { 153 D("called"); 154 *txq = 1; 155 *rxq = 1; 156 } 157 158 void netmap_mitigation_init(struct netmap_generic_adapter *na) 159 { 160 ND("called"); 161 na->mit_pending = 0; 162 } 163 164 165 void netmap_mitigation_start(struct netmap_generic_adapter *na) 166 { 167 ND("called"); 168 } 169 170 void netmap_mitigation_restart(struct netmap_generic_adapter *na) 171 { 172 ND("called"); 173 } 174 175 int netmap_mitigation_active(struct netmap_generic_adapter *na) 176 { 177 ND("called"); 178 return 0; 179 } 180 181 void netmap_mitigation_cleanup(struct netmap_generic_adapter *na) 182 { 183 ND("called"); 184 } 185 186 187 /* 188 * In order to track whether pages are still mapped, we hook into 189 * the standard cdev_pager and intercept the constructor and 190 * destructor. 191 */ 192 193 struct netmap_vm_handle_t { 194 struct cdev *dev; 195 struct netmap_priv_d *priv; 196 }; 197 198 static int 199 netmap_dev_pager_ctor(void *handle, vm_ooffset_t size, vm_prot_t prot, 200 vm_ooffset_t foff, struct ucred *cred, u_short *color) 201 { 202 struct netmap_vm_handle_t *vmh = handle; 203 (void)vmh; 204 D("handle %p size %jd prot %d foff %jd", 205 handle, (intmax_t)size, prot, (intmax_t)foff); 206 #if 0 207 dev_ref(vmh->dev); 208 #endif 209 return 0; 210 } 211 212 213 static void 214 netmap_dev_pager_dtor(void *handle) 215 { 216 struct netmap_vm_handle_t *vmh = handle; 217 struct cdev *dev = vmh->dev; 218 struct netmap_priv_d *priv = vmh->priv; 219 (void)dev; 220 D("handle %p", handle); 221 netmap_dtor(priv); 222 kfree(vmh, M_DEVBUF); 223 #if 0 224 dev_rel(dev); 225 #endif 226 } 227 228 MALLOC_DEFINE(M_FICT_PAGES, "", ""); 229 230 static inline vm_page_t 231 vm_page_getfake(vm_paddr_t paddr, vm_memattr_t memattr) 232 { 233 vm_page_t m; 234 235 m = kmalloc(sizeof(struct vm_page), M_FICT_PAGES, 236 M_WAITOK | M_ZERO); 237 vm_page_initfake(m, paddr, memattr); 238 return (m); 239 } 240 241 static inline void 242 vm_page_updatefake(vm_page_t m, vm_paddr_t paddr, vm_memattr_t memattr) 243 { 244 KASSERT((m->flags & PG_FICTITIOUS) != 0, 245 ("vm_page_updatefake: bad page %p", m)); 246 m->phys_addr = paddr; 247 pmap_page_set_memattr(m, memattr); 248 } 249 250 static int 251 netmap_dev_pager_fault(vm_object_t object, vm_ooffset_t offset, 252 int prot, vm_page_t *mres) 253 { 254 struct netmap_vm_handle_t *vmh = object->handle; 255 struct netmap_priv_d *priv = vmh->priv; 256 vm_paddr_t paddr; 257 vm_page_t page; 258 vm_memattr_t memattr; 259 vm_pindex_t pidx; 260 261 ND("object %p offset %jd prot %d mres %p", 262 object, (intmax_t)offset, prot, mres); 263 memattr = object->memattr; 264 pidx = OFF_TO_IDX(offset); 265 paddr = netmap_mem_ofstophys(priv->np_mref, offset); 266 if (paddr == 0) 267 return VM_PAGER_FAIL; 268 269 if (((*mres)->flags & PG_FICTITIOUS) != 0) { 270 /* 271 * If the passed in result page is a fake page, update it with 272 * the new physical address. 273 */ 274 page = *mres; 275 vm_page_updatefake(page, paddr, memattr); 276 } else { 277 /* 278 * Replace the passed in reqpage page with our own fake page and 279 * free up the all of the original pages. 280 */ 281 #ifndef VM_OBJECT_WUNLOCK /* FreeBSD < 10.x */ 282 #define VM_OBJECT_WUNLOCK VM_OBJECT_UNLOCK 283 #define VM_OBJECT_WLOCK VM_OBJECT_LOCK 284 #endif /* VM_OBJECT_WUNLOCK */ 285 286 VM_OBJECT_WUNLOCK(object); 287 page = vm_page_getfake(paddr, memattr); 288 VM_OBJECT_WLOCK(object); 289 vm_page_free(*mres); 290 *mres = page; 291 vm_page_insert(page, object, pidx); 292 } 293 page->valid = VM_PAGE_BITS_ALL; 294 return (VM_PAGER_OK); 295 } 296 297 298 static struct cdev_pager_ops netmap_cdev_pager_ops = { 299 .cdev_pg_ctor = netmap_dev_pager_ctor, 300 .cdev_pg_dtor = netmap_dev_pager_dtor, 301 .cdev_pg_fault = netmap_dev_pager_fault, 302 }; 303 304 305 static int 306 netmap_mmap_single(struct dev_mmap_single_args *ap) 307 { 308 int error; 309 struct cdev *cdev = ap->a_head.a_dev; 310 vm_ooffset_t *foff = ap->a_offset; 311 vm_object_t *objp = ap->a_object; 312 vm_size_t objsize = ap->a_size; 313 struct netmap_vm_handle_t *vmh; 314 struct netmap_priv_d *priv; 315 int prot = ap->a_nprot; 316 vm_object_t obj; 317 318 D("cdev %p foff %jd size %jd objp %p prot %d", cdev, 319 (intmax_t )*foff, (intmax_t )objsize, objp, prot); 320 321 vmh = kmalloc(sizeof(struct netmap_vm_handle_t), M_DEVBUF, 322 M_NOWAIT | M_ZERO); 323 if (vmh == NULL) 324 return ENOMEM; 325 vmh->dev = cdev; 326 327 NMG_LOCK(); 328 error = devfs_get_cdevpriv(ap->a_fp, (void**)&priv); 329 if (error) 330 goto err_unlock; 331 vmh->priv = priv; 332 priv->np_refcount++; 333 NMG_UNLOCK(); 334 335 error = netmap_get_memory(priv); 336 if (error) 337 goto err_deref; 338 339 obj = cdev_pager_allocate(vmh, OBJT_DEVICE, 340 &netmap_cdev_pager_ops, objsize, prot, 341 *foff, NULL); 342 if (obj == NULL) { 343 D("cdev_pager_allocate failed"); 344 error = EINVAL; 345 goto err_deref; 346 } 347 348 *objp = obj; 349 return 0; 350 351 err_deref: 352 NMG_LOCK(); 353 priv->np_refcount--; 354 err_unlock: 355 NMG_UNLOCK(); 356 // err: 357 kfree(vmh, M_DEVBUF); 358 return error; 359 } 360 361 362 // XXX can we remove this ? 363 static int 364 netmap_close(struct dev_close_args *ap) 365 { 366 if (netmap_verbose) 367 D("dev %p fflag 0x%x devtype %d", 368 ap->a_head.a_dev, ap->a_fflag, ap->a_devtype); 369 return 0; 370 } 371 372 373 static int 374 netmap_open(struct dev_open_args *ap) 375 { 376 struct netmap_priv_d *priv; 377 int error; 378 379 // XXX wait or nowait ? 380 priv = kmalloc(sizeof(struct netmap_priv_d), M_DEVBUF, 381 M_NOWAIT | M_ZERO); 382 if (priv == NULL) 383 return ENOMEM; 384 385 error = devfs_set_cdevpriv(ap->a_fp, priv, netmap_dtor); 386 if (error) 387 return error; 388 389 priv->np_refcount = 1; 390 391 return 0; 392 } 393 394 395 struct dev_ops netmap_cdevsw = { 396 { "netmap", 0, 0 }, 397 .d_open = netmap_open, 398 .d_mmap_single = netmap_mmap_single, 399 .d_ioctl = netmap_ioctl, 400 .d_kqfilter = netmap_kqfilter, 401 .d_close = netmap_close, 402 }; 403 404 405 /* 406 * Kernel entry point. 407 * 408 * Initialize/finalize the module and return. 409 * 410 * Return 0 on success, errno on failure. 411 */ 412 static int 413 netmap_loader(__unused struct module *module, int event, __unused void *arg) 414 { 415 int error = 0; 416 417 switch (event) { 418 case MOD_LOAD: 419 error = netmap_init(); 420 break; 421 422 case MOD_UNLOAD: 423 netmap_fini(); 424 break; 425 426 default: 427 error = EOPNOTSUPP; 428 break; 429 } 430 431 return (error); 432 } 433 434 435 DEV_MODULE(netmap, netmap_loader, NULL); 436