2 * Copyright (C) 2013 Universita` di Pisa. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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.
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
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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 #include <sys/bus.h> /* bus_dmamap_* */
33 #include <sys/malloc.h>
34 #include <sys/socket.h> /* sockaddrs */
36 #include <vm/vm.h> /* vtophys */
37 #include <vm/pmap.h> /* vtophys */
38 #include <vm/vm_param.h>
39 #include <vm/vm_object.h>
40 #include <vm/vm_page.h>
41 #include <vm/vm_pager.h>
45 #include <net/if_var.h>
46 #include <net/netmap.h>
48 #include "netmap_kern.h"
49 #include "netmap_mem2.h"
52 /* ======================== FREEBSD-SPECIFIC ROUTINES ================== */
55 * Intercept the rx routine in the standard device driver.
56 * Second argument is non-zero to intercept, 0 to restore
59 netmap_catch_rx(struct netmap_adapter *na, int intercept)
61 struct netmap_generic_adapter *gna = (struct netmap_generic_adapter *)na;
62 struct ifnet *ifp = na->ifp;
65 if (gna->save_if_input) {
66 D("cannot intercept again");
67 return EINVAL; /* already set */
69 gna->save_if_input = ifp->if_input;
70 ifp->if_input = generic_rx_handler;
72 if (!gna->save_if_input){
74 return EINVAL; /* not saved */
76 ifp->if_input = gna->save_if_input;
77 gna->save_if_input = NULL;
84 * Intercept the packet steering routine in the tx path,
85 * so that we can decide which queue is used for an mbuf.
86 * Second argument is non-zero to intercept, 0 to restore.
88 * XXX see if FreeBSD has such a mechanism
91 netmap_catch_packet_steering(struct netmap_generic_adapter *na, int enable)
98 /* Transmit routine used by generic_netmap_txsync(). Returns 0 on success
99 * and non-zero on error (which may be packet drops or other errors).
100 * addr and len identify the netmap buffer, m is the (preallocated)
101 * mbuf to use for transmissions.
103 * We should add a reference to the mbuf so the m_freem() at the end
104 * of the transmission does not consume resources.
106 * On FreeBSD, and on multiqueue cards, we can force the queue using
107 * if ((m->m_flags & M_FLOWID) != 0)
108 * i = m->m_pkthdr.flowid % adapter->num_queues;
110 * i = curcpu % adapter->num_queues;
114 generic_xmit_frame(struct ifnet *ifp, struct mbuf *m,
115 void *addr, u_int len, u_int ring_nr)
119 m->m_len = m->m_pkthdr.len = 0;
121 // copy data to the mbuf
122 m_copyback(m, 0, len, addr);
124 // inc refcount. We are alone, so we can skip the atomic
125 atomic_fetchadd_int(m->m_ext.ref_cnt, 1);
126 m->m_flags |= M_FLOWID;
127 m->m_pkthdr.flowid = ring_nr;
128 m->m_pkthdr.rcvif = ifp; /* used for tx notification */
129 ret = ifp->if_transmit(ifp, m);
134 * The following two functions are empty until we have a generic
135 * way to extract the info from the ifp
138 generic_find_num_desc(struct ifnet *ifp, unsigned int *tx, unsigned int *rx)
145 generic_find_num_queues(struct ifnet *ifp, u_int *txq, u_int *rxq)
152 void netmap_mitigation_init(struct netmap_generic_adapter *na)
159 void netmap_mitigation_start(struct netmap_generic_adapter *na)
164 void netmap_mitigation_restart(struct netmap_generic_adapter *na)
169 int netmap_mitigation_active(struct netmap_generic_adapter *na)
175 void netmap_mitigation_cleanup(struct netmap_generic_adapter *na)
182 * In order to track whether pages are still mapped, we hook into
183 * the standard cdev_pager and intercept the constructor and
187 struct netmap_vm_handle_t {
189 struct netmap_priv_d *priv;
193 netmap_dev_pager_ctor(void *handle, vm_ooffset_t size, vm_prot_t prot,
194 vm_ooffset_t foff, struct ucred *cred, u_short *color)
196 struct netmap_vm_handle_t *vmh = handle;
197 D("handle %p size %jd prot %d foff %jd",
198 handle, (intmax_t)size, prot, (intmax_t)foff);
205 netmap_dev_pager_dtor(void *handle)
207 struct netmap_vm_handle_t *vmh = handle;
208 struct cdev *dev = vmh->dev;
209 struct netmap_priv_d *priv = vmh->priv;
210 D("handle %p", handle);
212 kfree(vmh, M_DEVBUF);
217 netmap_dev_pager_fault(vm_object_t object, vm_ooffset_t offset,
218 int prot, vm_page_t *mres)
220 struct netmap_vm_handle_t *vmh = object->handle;
221 struct netmap_priv_d *priv = vmh->priv;
224 vm_memattr_t memattr;
227 ND("object %p offset %jd prot %d mres %p",
228 object, (intmax_t)offset, prot, mres);
229 memattr = object->memattr;
230 pidx = OFF_TO_IDX(offset);
231 paddr = netmap_mem_ofstophys(priv->np_mref, offset);
233 return VM_PAGER_FAIL;
235 if (((*mres)->flags & PG_FICTITIOUS) != 0) {
237 * If the passed in result page is a fake page, update it with
238 * the new physical address.
241 vm_page_updatefake(page, paddr, memattr);
244 * Replace the passed in reqpage page with our own fake page and
245 * free up the all of the original pages.
247 #ifndef VM_OBJECT_WUNLOCK /* FreeBSD < 10.x */
248 #define VM_OBJECT_WUNLOCK VM_OBJECT_UNLOCK
249 #define VM_OBJECT_WLOCK VM_OBJECT_LOCK
250 #endif /* VM_OBJECT_WUNLOCK */
252 VM_OBJECT_WUNLOCK(object);
253 page = vm_page_getfake(paddr, memattr);
254 VM_OBJECT_WLOCK(object);
257 vm_page_unlock(*mres);
259 vm_page_insert(page, object, pidx);
261 page->valid = VM_PAGE_BITS_ALL;
262 return (VM_PAGER_OK);
266 static struct cdev_pager_ops netmap_cdev_pager_ops = {
267 .cdev_pg_ctor = netmap_dev_pager_ctor,
268 .cdev_pg_dtor = netmap_dev_pager_dtor,
269 .cdev_pg_fault = netmap_dev_pager_fault,
274 netmap_mmap_single(struct cdev *cdev, vm_ooffset_t *foff,
275 vm_size_t objsize, vm_object_t *objp, int prot)
278 struct netmap_vm_handle_t *vmh;
279 struct netmap_priv_d *priv;
282 D("cdev %p foff %jd size %jd objp %p prot %d", cdev,
283 (intmax_t )*foff, (intmax_t )objsize, objp, prot);
285 vmh = kmalloc(sizeof(struct netmap_vm_handle_t), M_DEVBUF,
292 error = devfs_get_cdevpriv((void**)&priv);
299 error = netmap_get_memory(priv);
303 obj = cdev_pager_allocate(vmh, OBJT_DEVICE,
304 &netmap_cdev_pager_ops, objsize, prot,
307 D("cdev_pager_allocate failed");
321 kfree(vmh, M_DEVBUF);
326 // XXX can we remove this ?
328 netmap_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
331 D("dev %p fflag 0x%x devtype %d td %p",
332 dev, fflag, devtype, td);
338 netmap_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
340 struct netmap_priv_d *priv;
348 // XXX wait or nowait ?
349 priv = kmalloc(sizeof(struct netmap_priv_d), M_DEVBUF,
354 error = devfs_set_cdevpriv(priv, netmap_dtor);
358 priv->np_refcount = 1;
364 struct cdevsw netmap_cdevsw = {
365 .d_version = D_VERSION,
367 .d_open = netmap_open,
368 .d_mmap_single = netmap_mmap_single,
369 .d_ioctl = netmap_ioctl,
370 .d_poll = netmap_poll,
371 .d_close = netmap_close,
376 * Kernel entry point.
378 * Initialize/finalize the module and return.
380 * Return 0 on success, errno on failure.
383 netmap_loader(__unused struct module *module, int event, __unused void *arg)
389 error = netmap_init();
405 DEV_MODULE(netmap, netmap_loader, NULL);