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/devfs.h>
34 #include <vm/vm.h> /* vtophys */
35 #include <vm/pmap.h> /* vtophys */
36 #include <vm/vm_param.h>
37 #include <vm/vm_object.h>
38 #include <vm/vm_page.h>
39 #include <vm/vm_page2.h>
40 #include <vm/vm_pager.h>
43 #include <sys/malloc.h>
44 #include <sys/socket.h> /* sockaddrs */
45 #include <sys/event.h>
47 #include <net/if_var.h>
48 #include <sys/bus.h> /* bus_dmamap_* */
50 #include <net/netmap.h>
51 #include "netmap_kern.h"
52 #include "netmap_mem2.h"
55 /* ======================== FREEBSD-SPECIFIC ROUTINES ================== */
58 * Intercept the rx routine in the standard device driver.
59 * Second argument is non-zero to intercept, 0 to restore
62 netmap_catch_rx(struct netmap_adapter *na, int intercept)
64 struct netmap_generic_adapter *gna = (struct netmap_generic_adapter *)na;
65 struct ifnet *ifp = na->ifp;
68 if (gna->save_if_input) {
69 D("cannot intercept again");
70 return EINVAL; /* already set */
72 gna->save_if_input = ifp->if_input;
73 ifp->if_input = generic_rx_handler;
75 if (!gna->save_if_input){
77 return EINVAL; /* not saved */
79 ifp->if_input = gna->save_if_input;
80 gna->save_if_input = NULL;
87 * Intercept the packet steering routine in the tx path,
88 * so that we can decide which queue is used for an mbuf.
89 * Second argument is non-zero to intercept, 0 to restore.
91 * XXX see if FreeBSD has such a mechanism
94 netmap_catch_packet_steering(struct netmap_generic_adapter *na, int enable)
101 /* Transmit routine used by generic_netmap_txsync(). Returns 0 on success
102 * and non-zero on error (which may be packet drops or other errors).
103 * addr and len identify the netmap buffer, m is the (preallocated)
104 * mbuf to use for transmissions.
106 * We should add a reference to the mbuf so the m_freem() at the end
107 * of the transmission does not consume resources.
109 * On FreeBSD, and on multiqueue cards, we can force the queue using
110 * if ((m->m_flags & M_FLOWID) != 0)
111 * i = m->m_pkthdr.flowid % adapter->num_queues;
113 * i = curcpu % adapter->num_queues;
117 generic_xmit_frame(struct ifnet *ifp, struct mbuf *m,
118 void *addr, u_int len, u_int ring_nr)
122 m->m_len = m->m_pkthdr.len = 0;
124 // copy data to the mbuf
125 m_copyback(m, 0, len, addr);
128 // inc refcount. We are alone, so we can skip the atomic
129 atomic_fetchadd_int(m->m_ext.ref_cnt, 1);
130 m->m_flags |= M_FLOWID;
132 m->m_pkthdr.hash = ring_nr; /* XXX probably not accurate */
133 m->m_pkthdr.rcvif = ifp; /* used for tx notification */
134 ret = ifp->if_transmit(ifp, m);
139 * The following two functions are empty until we have a generic
140 * way to extract the info from the ifp
143 generic_find_num_desc(struct ifnet *ifp, unsigned int *tx, unsigned int *rx)
150 generic_find_num_queues(struct ifnet *ifp, u_int *txq, u_int *rxq)
157 void netmap_mitigation_init(struct netmap_generic_adapter *na)
164 void netmap_mitigation_start(struct netmap_generic_adapter *na)
169 void netmap_mitigation_restart(struct netmap_generic_adapter *na)
174 int netmap_mitigation_active(struct netmap_generic_adapter *na)
180 void netmap_mitigation_cleanup(struct netmap_generic_adapter *na)
187 * In order to track whether pages are still mapped, we hook into
188 * the standard cdev_pager and intercept the constructor and
192 struct netmap_vm_handle_t {
194 struct netmap_priv_d *priv;
198 netmap_dev_pager_ctor(void *handle, vm_ooffset_t size, vm_prot_t prot,
199 vm_ooffset_t foff, struct ucred *cred, u_short *color)
201 struct netmap_vm_handle_t *vmh = handle;
203 D("handle %p size %jd prot %d foff %jd",
204 handle, (intmax_t)size, prot, (intmax_t)foff);
213 netmap_dev_pager_dtor(void *handle)
215 struct netmap_vm_handle_t *vmh = handle;
216 struct cdev *dev = vmh->dev;
217 struct netmap_priv_d *priv = vmh->priv;
219 D("handle %p", handle);
221 kfree(vmh, M_DEVBUF);
228 netmap_dev_pager_fault(vm_object_t object, vm_ooffset_t offset,
229 int prot, vm_page_t *mres)
231 struct netmap_vm_handle_t *vmh = object->handle;
232 struct netmap_priv_d *priv = vmh->priv;
235 vm_memattr_t memattr;
238 ND("object %p offset %jd prot %d mres %p",
239 object, (intmax_t)offset, prot, mres);
240 memattr = object->memattr;
241 pidx = OFF_TO_IDX(offset);
242 paddr = netmap_mem_ofstophys(priv->np_mref, offset);
244 return VM_PAGER_FAIL;
246 if (((*mres)->flags & PG_FICTITIOUS) != 0) {
248 * If the passed in result page is a fake page, update it with
249 * the new physical address.
252 vm_page_updatefake(page, paddr, memattr);
255 * Replace the passed in reqpage page with our own fake page and
256 * free up the all of the original pages.
258 #ifndef VM_OBJECT_WUNLOCK /* FreeBSD < 10.x */
259 #define VM_OBJECT_WUNLOCK VM_OBJECT_UNLOCK
260 #define VM_OBJECT_WLOCK VM_OBJECT_LOCK
261 #endif /* VM_OBJECT_WUNLOCK */
263 VM_OBJECT_WUNLOCK(object);
264 page = vm_page_getfake(paddr, memattr);
265 VM_OBJECT_WLOCK(object);
268 vm_page_insert(page, object, pidx);
270 page->valid = VM_PAGE_BITS_ALL;
271 return (VM_PAGER_OK);
275 static struct cdev_pager_ops netmap_cdev_pager_ops = {
276 .cdev_pg_ctor = netmap_dev_pager_ctor,
277 .cdev_pg_dtor = netmap_dev_pager_dtor,
278 .cdev_pg_fault = netmap_dev_pager_fault,
283 netmap_mmap_single(struct dev_mmap_single_args *ap)
286 struct cdev *cdev = ap->a_head.a_dev;
287 vm_ooffset_t *foff = ap->a_offset;
288 vm_object_t *objp = ap->a_object;
289 vm_size_t objsize = ap->a_size;
290 struct netmap_vm_handle_t *vmh;
291 struct netmap_priv_d *priv;
292 int prot = ap->a_nprot;
295 D("cdev %p foff %jd size %jd objp %p prot %d", cdev,
296 (intmax_t )*foff, (intmax_t )objsize, objp, prot);
298 vmh = kmalloc(sizeof(struct netmap_vm_handle_t), M_DEVBUF,
306 error = devfs_get_cdevpriv((void**)&priv);
314 error = netmap_get_memory(priv);
318 obj = cdev_pager_allocate(vmh, OBJT_DEVICE,
319 &netmap_cdev_pager_ops, objsize, prot,
322 D("cdev_pager_allocate failed");
338 kfree(vmh, M_DEVBUF);
343 // XXX can we remove this ?
345 netmap_close(struct dev_close_args *ap)
348 D("dev %p fflag 0x%x devtype %d",
349 ap->a_head.a_dev, ap->a_fflag, ap->a_devtype);
355 netmap_open(struct dev_open_args *ap)
357 struct netmap_priv_d *priv;
364 // XXX wait or nowait ?
365 priv = kmalloc(sizeof(struct netmap_priv_d), M_DEVBUF,
371 error = devfs_set_cdevpriv(priv, netmap_dtor);
376 priv->np_refcount = 1;
382 struct dev_ops netmap_cdevsw = {
384 .d_open = netmap_open,
385 .d_mmap_single = netmap_mmap_single,
386 .d_ioctl = netmap_ioctl,
388 .d_poll = netmap_poll,
390 .d_close = netmap_close,
395 * Kernel entry point.
397 * Initialize/finalize the module and return.
399 * Return 0 on success, errno on failure.
402 netmap_loader(__unused struct module *module, int event, __unused void *arg)
408 error = netmap_init();
424 DEV_MODULE(netmap, netmap_loader, NULL);