2 * Copyright (c) 2004-2006 Kip Macy
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
31 #include "opt_inet6.h"
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/sockio.h>
36 #include <sys/limits.h>
38 #include <sys/malloc.h>
39 #include <sys/module.h>
40 #include <sys/kernel.h>
41 #include <sys/socket.h>
42 #include <sys/sysctl.h>
43 #include <sys/queue.h>
48 #include <net/if_var.h>
49 #include <net/if_arp.h>
50 #include <net/ethernet.h>
51 #include <net/if_dl.h>
52 #include <net/if_media.h>
56 #include <net/if_types.h>
58 #include <netinet/in_systm.h>
59 #include <netinet/in.h>
60 #include <netinet/ip.h>
61 #include <netinet/if_ether.h>
62 #if __FreeBSD_version >= 700000
63 #include <netinet/tcp.h>
64 #include <netinet/tcp_lro.h>
70 #include <machine/clock.h> /* for DELAY */
71 #include <machine/bus.h>
72 #include <machine/resource.h>
73 #include <machine/frame.h>
74 #include <machine/vmparam.h>
79 #include <machine/intr_machdep.h>
81 #include <xen/xen-os.h>
82 #include <xen/hypervisor.h>
83 #include <xen/xen_intr.h>
84 #include <xen/gnttab.h>
85 #include <xen/interface/memory.h>
86 #include <xen/interface/io/netif.h>
87 #include <xen/xenbus/xenbusvar.h>
89 #include <machine/xen/xenvar.h>
91 #include "xenbus_if.h"
93 /* Features supported by all backends. TSO and LRO can be negotiated */
94 #define XN_CSUM_FEATURES (CSUM_TCP | CSUM_UDP)
96 #define NET_TX_RING_SIZE __RING_SIZE((netif_tx_sring_t *)0, PAGE_SIZE)
97 #define NET_RX_RING_SIZE __RING_SIZE((netif_rx_sring_t *)0, PAGE_SIZE)
99 #if __FreeBSD_version >= 700000
101 * Should the driver do LRO on the RX end
102 * this can be toggled on the fly, but the
103 * interface must be reset (down/up) for it
106 static int xn_enable_lro = 1;
107 TUNABLE_INT("hw.xn.enable_lro", &xn_enable_lro);
116 static int MODPARM_rx_copy = 0;
117 module_param_named(rx_copy, MODPARM_rx_copy, bool, 0);
118 MODULE_PARM_DESC(rx_copy, "Copy packets from network card (rather than flip)");
119 static int MODPARM_rx_flip = 0;
120 module_param_named(rx_flip, MODPARM_rx_flip, bool, 0);
121 MODULE_PARM_DESC(rx_flip, "Flip packets from network card (rather than copy)");
123 static const int MODPARM_rx_copy = 1;
124 static const int MODPARM_rx_flip = 0;
128 * \brief The maximum allowed data fragments in a single transmit
131 * This limit is imposed by the backend driver. We assume here that
132 * we are dealing with a Linux driver domain and have set our limit
133 * to mirror the Linux MAX_SKB_FRAGS constant.
135 #define MAX_TX_REQ_FRAGS (65536 / PAGE_SIZE + 2)
137 #define RX_COPY_THRESHOLD 256
139 #define net_ratelimit() 0
141 struct netfront_info;
142 struct netfront_rx_info;
144 static void xn_txeof(struct netfront_info *);
145 static void xn_rxeof(struct netfront_info *);
146 static void network_alloc_rx_buffers(struct netfront_info *);
148 static void xn_tick_locked(struct netfront_info *);
149 static void xn_tick(void *);
151 static void xn_intr(void *);
152 static inline int xn_count_frags(struct mbuf *m);
153 static int xn_assemble_tx_request(struct netfront_info *sc,
154 struct mbuf *m_head);
155 static void xn_start_locked(struct ifnet *);
156 static void xn_start(struct ifnet *);
157 static int xn_ioctl(struct ifnet *, u_long, caddr_t);
158 static void xn_ifinit_locked(struct netfront_info *);
159 static void xn_ifinit(void *);
160 static void xn_stop(struct netfront_info *);
161 static void xn_query_features(struct netfront_info *np);
162 static int xn_configure_features(struct netfront_info *np);
164 static void xn_watchdog(struct ifnet *);
168 static void netfront_closing(device_t dev);
170 static void netif_free(struct netfront_info *info);
171 static int netfront_detach(device_t dev);
173 static int talk_to_backend(device_t dev, struct netfront_info *info);
174 static int create_netdev(device_t dev);
175 static void netif_disconnect_backend(struct netfront_info *info);
176 static int setup_device(device_t dev, struct netfront_info *info);
177 static void free_ring(int *ref, void *ring_ptr_ref);
179 static int xn_ifmedia_upd(struct ifnet *ifp);
180 static void xn_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr);
182 /* Xenolinux helper functions */
183 int network_connect(struct netfront_info *);
185 static void xn_free_rx_ring(struct netfront_info *);
187 static void xn_free_tx_ring(struct netfront_info *);
189 static int xennet_get_responses(struct netfront_info *np,
190 struct netfront_rx_info *rinfo, RING_IDX rp, RING_IDX *cons,
191 struct mbuf **list, int *pages_flipped_p);
193 #define virt_to_mfn(x) (vtomach(x) >> PAGE_SHIFT)
195 #define INVALID_P2M_ENTRY (~0UL)
198 * Mbuf pointers. We need these to keep track of the virtual addresses
199 * of our mbuf chains since we can only convert from virtual to physical,
200 * not the other way around. The size must track the free index arrays.
202 struct xn_chain_data {
203 struct mbuf *xn_tx_chain[NET_TX_RING_SIZE+1];
205 struct mbuf *xn_rx_chain[NET_RX_RING_SIZE+1];
208 struct net_device_stats
210 u_long rx_packets; /* total packets received */
211 u_long tx_packets; /* total packets transmitted */
212 u_long rx_bytes; /* total bytes received */
213 u_long tx_bytes; /* total bytes transmitted */
214 u_long rx_errors; /* bad packets received */
215 u_long tx_errors; /* packet transmit problems */
216 u_long rx_dropped; /* no space in linux buffers */
217 u_long tx_dropped; /* no space available in linux */
218 u_long multicast; /* multicast packets received */
221 /* detailed rx_errors: */
222 u_long rx_length_errors;
223 u_long rx_over_errors; /* receiver ring buff overflow */
224 u_long rx_crc_errors; /* recved pkt with crc error */
225 u_long rx_frame_errors; /* recv'd frame alignment error */
226 u_long rx_fifo_errors; /* recv'r fifo overrun */
227 u_long rx_missed_errors; /* receiver missed packet */
229 /* detailed tx_errors */
230 u_long tx_aborted_errors;
231 u_long tx_carrier_errors;
232 u_long tx_fifo_errors;
233 u_long tx_heartbeat_errors;
234 u_long tx_window_errors;
237 u_long rx_compressed;
238 u_long tx_compressed;
241 struct netfront_info {
242 struct ifnet *xn_ifp;
243 #if __FreeBSD_version >= 700000
244 struct lro_ctrl xn_lro;
247 struct net_device_stats stats;
250 netif_tx_front_ring_t tx;
251 netif_rx_front_ring_t rx;
257 xen_intr_handle_t xen_intr_handle;
258 u_int copying_receiver;
262 /* Receive-ring batched refills. */
263 #define RX_MIN_TARGET 32
264 #define RX_MAX_TARGET NET_RX_RING_SIZE
269 grant_ref_t gref_tx_head;
270 grant_ref_t grant_tx_ref[NET_TX_RING_SIZE + 1];
271 grant_ref_t gref_rx_head;
272 grant_ref_t grant_rx_ref[NET_TX_RING_SIZE + 1];
277 uint8_t mac[ETHER_ADDR_LEN];
278 struct xn_chain_data xn_cdata; /* mbufs */
279 struct mbufq xn_rx_batch; /* batch queue */
282 struct callout xn_stat_ch;
284 u_long rx_pfn_array[NET_RX_RING_SIZE];
285 multicall_entry_t rx_mcl[NET_RX_RING_SIZE+1];
286 mmu_update_t rx_mmu[NET_RX_RING_SIZE];
287 struct ifmedia sc_media;
292 #define rx_mbufs xn_cdata.xn_rx_chain
293 #define tx_mbufs xn_cdata.xn_tx_chain
295 #define XN_LOCK_INIT(_sc, _name) \
296 mtx_init(&(_sc)->tx_lock, #_name"_tx", "network transmit lock", MTX_DEF); \
297 mtx_init(&(_sc)->rx_lock, #_name"_rx", "network receive lock", MTX_DEF); \
298 mtx_init(&(_sc)->sc_lock, #_name"_sc", "netfront softc lock", MTX_DEF)
300 #define XN_RX_LOCK(_sc) mtx_lock(&(_sc)->rx_lock)
301 #define XN_RX_UNLOCK(_sc) mtx_unlock(&(_sc)->rx_lock)
303 #define XN_TX_LOCK(_sc) mtx_lock(&(_sc)->tx_lock)
304 #define XN_TX_UNLOCK(_sc) mtx_unlock(&(_sc)->tx_lock)
306 #define XN_LOCK(_sc) mtx_lock(&(_sc)->sc_lock);
307 #define XN_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_lock);
309 #define XN_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->sc_lock, MA_OWNED);
310 #define XN_RX_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->rx_lock, MA_OWNED);
311 #define XN_TX_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->tx_lock, MA_OWNED);
312 #define XN_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->rx_lock); \
313 mtx_destroy(&(_sc)->tx_lock); \
314 mtx_destroy(&(_sc)->sc_lock);
316 struct netfront_rx_info {
317 struct netif_rx_response rx;
318 struct netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1];
321 #define netfront_carrier_on(netif) ((netif)->carrier = 1)
322 #define netfront_carrier_off(netif) ((netif)->carrier = 0)
323 #define netfront_carrier_ok(netif) ((netif)->carrier)
325 /* Access macros for acquiring freeing slots in xn_free_{tx,rx}_idxs[]. */
328 add_id_to_freelist(struct mbuf **list, uintptr_t id)
331 ("%s: the head item (0) must always be free.", __func__));
333 list[0] = (struct mbuf *)id;
336 static inline unsigned short
337 get_id_from_freelist(struct mbuf **list)
341 id = (uintptr_t)list[0];
343 ("%s: the head item (0) must always remain free.", __func__));
349 xennet_rxidx(RING_IDX idx)
351 return idx & (NET_RX_RING_SIZE - 1);
354 static inline struct mbuf *
355 xennet_get_rx_mbuf(struct netfront_info *np, RING_IDX ri)
357 int i = xennet_rxidx(ri);
361 np->rx_mbufs[i] = NULL;
365 static inline grant_ref_t
366 xennet_get_rx_ref(struct netfront_info *np, RING_IDX ri)
368 int i = xennet_rxidx(ri);
369 grant_ref_t ref = np->grant_rx_ref[i];
370 KASSERT(ref != GRANT_REF_INVALID, ("Invalid grant reference!\n"));
371 np->grant_rx_ref[i] = GRANT_REF_INVALID;
375 #define IPRINTK(fmt, args...) \
376 printf("[XEN] " fmt, ##args)
378 #define WPRINTK(fmt, args...) \
379 printf("[XEN] " fmt, ##args)
381 #define WPRINTK(fmt, args...)
384 #define DPRINTK(fmt, args...) \
385 printf("[XEN] %s: " fmt, __func__, ##args)
387 #define DPRINTK(fmt, args...)
391 * Read the 'mac' node at the given device's node in the store, and parse that
392 * as colon-separated octets, placing result the given mac array. mac must be
393 * a preallocated array of length ETH_ALEN (as declared in linux/if_ether.h).
394 * Return 0 on success, or errno on error.
397 xen_net_read_mac(device_t dev, uint8_t mac[])
400 char *s, *e, *macstr;
403 path = xenbus_get_node(dev);
404 error = xs_read(XST_NIL, path, "mac", NULL, (void **) &macstr);
405 if (error == ENOENT) {
407 * Deal with missing mac XenStore nodes on devices with
408 * HVM emulation (the 'ioemu' configuration attribute)
411 * The HVM emulator may execute in a stub device model
412 * domain which lacks the permission, only given to Dom0,
413 * to update the guest's XenStore tree. For this reason,
414 * the HVM emulator doesn't even attempt to write the
415 * front-side mac node, even when operating in Dom0.
416 * However, there should always be a mac listed in the
417 * backend tree. Fallback to this version if our query
418 * of the front side XenStore location doesn't find
421 path = xenbus_get_otherend_path(dev);
422 error = xs_read(XST_NIL, path, "mac", NULL, (void **) &macstr);
425 xenbus_dev_fatal(dev, error, "parsing %s/mac", path);
430 for (i = 0; i < ETHER_ADDR_LEN; i++) {
431 mac[i] = strtoul(s, &e, 16);
432 if (s == e || (e[0] != ':' && e[0] != 0)) {
433 free(macstr, M_XENBUS);
438 free(macstr, M_XENBUS);
443 * Entry point to this code when a new device is created. Allocate the basic
444 * structures and the ring buffers for communication with the backend, and
445 * inform the backend of the appropriate details for those. Switch to
449 netfront_probe(device_t dev)
452 if (!strcmp(xenbus_get_type(dev), "vif")) {
453 device_set_desc(dev, "Virtual Network Interface");
461 netfront_attach(device_t dev)
465 err = create_netdev(dev);
467 xenbus_dev_fatal(dev, err, "creating netdev");
471 #if __FreeBSD_version >= 700000
472 SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
473 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
474 OID_AUTO, "enable_lro", CTLFLAG_RW,
475 &xn_enable_lro, 0, "Large Receive Offload");
482 netfront_suspend(device_t dev)
484 struct netfront_info *info = device_get_softc(dev);
488 netfront_carrier_off(info);
495 * We are reconnecting to the backend, due to a suspend/resume, or a backend
496 * driver restart. We tear down our netif structure and recreate it, but
497 * leave the device-layer structures intact so that this is transparent to the
498 * rest of the kernel.
501 netfront_resume(device_t dev)
503 struct netfront_info *info = device_get_softc(dev);
505 info->xn_resume = true;
506 netif_disconnect_backend(info);
510 /* Common code used when first setting up, and when resuming. */
512 talk_to_backend(device_t dev, struct netfront_info *info)
515 struct xs_transaction xst;
516 const char *node = xenbus_get_node(dev);
519 err = xen_net_read_mac(dev, info->mac);
521 xenbus_dev_fatal(dev, err, "parsing %s/mac", node);
525 /* Create shared ring, alloc event channel. */
526 err = setup_device(dev, info);
531 err = xs_transaction_start(&xst);
533 xenbus_dev_fatal(dev, err, "starting transaction");
536 err = xs_printf(xst, node, "tx-ring-ref","%u",
539 message = "writing tx ring-ref";
540 goto abort_transaction;
542 err = xs_printf(xst, node, "rx-ring-ref","%u",
545 message = "writing rx ring-ref";
546 goto abort_transaction;
548 err = xs_printf(xst, node,
549 "event-channel", "%u",
550 xen_intr_port(info->xen_intr_handle));
552 message = "writing event-channel";
553 goto abort_transaction;
555 err = xs_printf(xst, node, "request-rx-copy", "%u",
556 info->copying_receiver);
558 message = "writing request-rx-copy";
559 goto abort_transaction;
561 err = xs_printf(xst, node, "feature-rx-notify", "%d", 1);
563 message = "writing feature-rx-notify";
564 goto abort_transaction;
566 err = xs_printf(xst, node, "feature-sg", "%d", 1);
568 message = "writing feature-sg";
569 goto abort_transaction;
571 #if __FreeBSD_version >= 700000
572 err = xs_printf(xst, node, "feature-gso-tcpv4", "%d", 1);
574 message = "writing feature-gso-tcpv4";
575 goto abort_transaction;
579 err = xs_transaction_end(xst, 0);
583 xenbus_dev_fatal(dev, err, "completing transaction");
590 xs_transaction_end(xst, 1);
591 xenbus_dev_fatal(dev, err, "%s", message);
599 setup_device(device_t dev, struct netfront_info *info)
601 netif_tx_sring_t *txs;
602 netif_rx_sring_t *rxs;
608 info->tx_ring_ref = GRANT_REF_INVALID;
609 info->rx_ring_ref = GRANT_REF_INVALID;
610 info->rx.sring = NULL;
611 info->tx.sring = NULL;
613 txs = (netif_tx_sring_t *)malloc(PAGE_SIZE, M_DEVBUF, M_NOWAIT|M_ZERO);
616 xenbus_dev_fatal(dev, error, "allocating tx ring page");
619 SHARED_RING_INIT(txs);
620 FRONT_RING_INIT(&info->tx, txs, PAGE_SIZE);
621 error = xenbus_grant_ring(dev, virt_to_mfn(txs), &info->tx_ring_ref);
625 rxs = (netif_rx_sring_t *)malloc(PAGE_SIZE, M_DEVBUF, M_NOWAIT|M_ZERO);
628 xenbus_dev_fatal(dev, error, "allocating rx ring page");
631 SHARED_RING_INIT(rxs);
632 FRONT_RING_INIT(&info->rx, rxs, PAGE_SIZE);
634 error = xenbus_grant_ring(dev, virt_to_mfn(rxs), &info->rx_ring_ref);
638 error = xen_intr_alloc_and_bind_local_port(dev,
639 xenbus_get_otherend_id(dev), /*filter*/NULL, xn_intr, info,
640 INTR_TYPE_NET | INTR_MPSAFE | INTR_ENTROPY, &info->xen_intr_handle);
643 xenbus_dev_fatal(dev, error,
644 "xen_intr_alloc_and_bind_local_port failed");
657 * If this interface has an ipv4 address, send an arp for it. This
658 * helps to get the network going again after migrating hosts.
661 netfront_send_fake_arp(device_t dev, struct netfront_info *info)
667 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
668 if (ifa->ifa_addr->sa_family == AF_INET) {
669 arp_ifinit(ifp, ifa);
676 * Callback received when the backend's state changes.
679 netfront_backend_changed(device_t dev, XenbusState newstate)
681 struct netfront_info *sc = device_get_softc(dev);
683 DPRINTK("newstate=%d\n", newstate);
686 case XenbusStateInitialising:
687 case XenbusStateInitialised:
688 case XenbusStateUnknown:
689 case XenbusStateClosed:
690 case XenbusStateReconfigured:
691 case XenbusStateReconfiguring:
693 case XenbusStateInitWait:
694 if (xenbus_get_state(dev) != XenbusStateInitialising)
696 if (network_connect(sc) != 0)
698 xenbus_set_state(dev, XenbusStateConnected);
700 case XenbusStateClosing:
701 xenbus_set_state(dev, XenbusStateClosed);
703 case XenbusStateConnected:
705 netfront_send_fake_arp(dev, sc);
712 xn_free_rx_ring(struct netfront_info *sc)
717 for (i = 0; i < NET_RX_RING_SIZE; i++) {
718 if (sc->xn_cdata.rx_mbufs[i] != NULL) {
719 m_freem(sc->rx_mbufs[i]);
720 sc->rx_mbufs[i] = NULL;
725 sc->xn_rx_if->req_prod = 0;
726 sc->xn_rx_if->event = sc->rx.rsp_cons ;
731 xn_free_tx_ring(struct netfront_info *sc)
736 for (i = 0; i < NET_TX_RING_SIZE; i++) {
737 if (sc->tx_mbufs[i] != NULL) {
738 m_freem(sc->tx_mbufs[i]);
739 sc->xn_cdata.xn_tx_chain[i] = NULL;
748 * \brief Verify that there is sufficient space in the Tx ring
749 * buffer for a maximally sized request to be enqueued.
751 * A transmit request requires a transmit descriptor for each packet
752 * fragment, plus up to 2 entries for "options" (e.g. TSO).
755 xn_tx_slot_available(struct netfront_info *np)
757 return (RING_FREE_REQUESTS(&np->tx) > (MAX_TX_REQ_FRAGS + 2));
761 netif_release_tx_bufs(struct netfront_info *np)
765 for (i = 1; i <= NET_TX_RING_SIZE; i++) {
771 * We assume that no kernel addresses are
772 * less than NET_TX_RING_SIZE. Any entry
773 * in the table that is below this number
774 * must be an index from free-list tracking.
776 if (((uintptr_t)m) <= NET_TX_RING_SIZE)
778 gnttab_end_foreign_access_ref(np->grant_tx_ref[i]);
779 gnttab_release_grant_reference(&np->gref_tx_head,
780 np->grant_tx_ref[i]);
781 np->grant_tx_ref[i] = GRANT_REF_INVALID;
782 add_id_to_freelist(np->tx_mbufs, i);
783 np->xn_cdata.xn_tx_chain_cnt--;
784 if (np->xn_cdata.xn_tx_chain_cnt < 0) {
785 panic("%s: tx_chain_cnt must be >= 0", __func__);
792 network_alloc_rx_buffers(struct netfront_info *sc)
794 int otherend_id = xenbus_get_otherend_id(sc->xbdev);
797 int i, batch_target, notify;
799 struct xen_memory_reservation reservation;
802 netif_rx_request_t *req;
806 req_prod = sc->rx.req_prod_pvt;
808 if (__predict_false(sc->carrier == 0))
812 * Allocate mbufs greedily, even though we batch updates to the
813 * receive ring. This creates a less bursty demand on the memory
814 * allocator, and so should reduce the chance of failed allocation
815 * requests both for ourself and for other kernel subsystems.
817 * Here we attempt to maintain rx_target buffers in flight, counting
818 * buffers that we have yet to process in the receive ring.
820 batch_target = sc->rx_target - (req_prod - sc->rx.rsp_cons);
821 for (i = mbufq_len(&sc->xn_rx_batch); i < batch_target; i++) {
822 m_new = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, MJUMPAGESIZE);
831 m_new->m_len = m_new->m_pkthdr.len = MJUMPAGESIZE;
833 /* queue the mbufs allocated */
834 (void )mbufq_enqueue(&sc->xn_rx_batch, m_new);
838 * If we've allocated at least half of our target number of entries,
839 * submit them to the backend - we have enough to make the overhead
840 * of submission worthwhile. Otherwise wait for more mbufs and
841 * request entries to become available.
843 if (i < (sc->rx_target/2)) {
844 if (req_prod >sc->rx.sring->req_prod)
850 * Double floating fill target if we risked having the backend
851 * run out of empty buffers for receive traffic. We define "running
852 * low" as having less than a fourth of our target buffers free
853 * at the time we refilled the queue.
855 if ((req_prod - sc->rx.sring->rsp_prod) < (sc->rx_target / 4)) {
857 if (sc->rx_target > sc->rx_max_target)
858 sc->rx_target = sc->rx_max_target;
862 for (nr_flips = i = 0; ; i++) {
863 if ((m_new = mbufq_dequeue(&sc->xn_rx_batch)) == NULL)
866 m_new->m_ext.ext_arg1 = (vm_paddr_t *)(uintptr_t)(
867 vtophys(m_new->m_ext.ext_buf) >> PAGE_SHIFT);
869 id = xennet_rxidx(req_prod + i);
871 KASSERT(sc->rx_mbufs[id] == NULL, ("non-NULL xm_rx_chain"));
872 sc->rx_mbufs[id] = m_new;
874 ref = gnttab_claim_grant_reference(&sc->gref_rx_head);
875 KASSERT(ref != GNTTAB_LIST_END,
876 ("reserved grant references exhuasted"));
877 sc->grant_rx_ref[id] = ref;
879 vaddr = mtod(m_new, vm_offset_t);
880 pfn = vtophys(vaddr) >> PAGE_SHIFT;
881 req = RING_GET_REQUEST(&sc->rx, req_prod + i);
883 if (sc->copying_receiver == 0) {
884 gnttab_grant_foreign_transfer_ref(ref,
886 sc->rx_pfn_array[nr_flips] = pfn;
887 if (!xen_feature(XENFEAT_auto_translated_physmap)) {
888 /* Remove this page before passing
891 MULTI_update_va_mapping(&sc->rx_mcl[i],
896 gnttab_grant_foreign_access_ref(ref,
903 sc->rx_pfn_array[i] =
904 vtomach(mtod(m_new,vm_offset_t)) >> PAGE_SHIFT;
907 KASSERT(i, ("no mbufs processed")); /* should have returned earlier */
908 KASSERT(mbufq_len(&sc->xn_rx_batch) == 0, ("not all mbufs processed"));
910 * We may have allocated buffers which have entries outstanding
911 * in the page * update queue -- make sure we flush those first!
915 /* Tell the ballon driver what is going on. */
916 balloon_update_driver_allowance(i);
918 set_xen_guest_handle(reservation.extent_start, sc->rx_pfn_array);
919 reservation.nr_extents = i;
920 reservation.extent_order = 0;
921 reservation.address_bits = 0;
922 reservation.domid = DOMID_SELF;
924 if (!xen_feature(XENFEAT_auto_translated_physmap)) {
925 /* After all PTEs have been zapped, flush the TLB. */
926 sc->rx_mcl[i-1].args[MULTI_UVMFLAGS_INDEX] =
927 UVMF_TLB_FLUSH|UVMF_ALL;
929 /* Give away a batch of pages. */
930 sc->rx_mcl[i].op = __HYPERVISOR_memory_op;
931 sc->rx_mcl[i].args[0] = XENMEM_decrease_reservation;
932 sc->rx_mcl[i].args[1] = (u_long)&reservation;
933 /* Zap PTEs and give away pages in one big multicall. */
934 (void)HYPERVISOR_multicall(sc->rx_mcl, i+1);
936 if (__predict_false(sc->rx_mcl[i].result != i ||
937 HYPERVISOR_memory_op(XENMEM_decrease_reservation,
939 panic("%s: unable to reduce memory "
940 "reservation\n", __func__);
946 /* Above is a suitable barrier to ensure backend will see requests. */
947 sc->rx.req_prod_pvt = req_prod + i;
949 RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&sc->rx, notify);
951 xen_intr_signal(sc->xen_intr_handle);
955 xn_rxeof(struct netfront_info *np)
958 #if __FreeBSD_version >= 700000 && (defined(INET) || defined(INET6))
959 struct lro_ctrl *lro = &np->xn_lro;
960 struct lro_entry *queued;
962 struct netfront_rx_info rinfo;
963 struct netif_rx_response *rx = &rinfo.rx;
964 struct netif_extra_info *extras = rinfo.extras;
966 multicall_entry_t *mcl;
968 struct mbufq rxq, errq;
969 int err, pages_flipped = 0, work_to_do;
972 XN_RX_LOCK_ASSERT(np);
973 if (!netfront_carrier_ok(np))
976 /* XXX: there should be some sane limit. */
977 mbufq_init(&errq, INT_MAX);
978 mbufq_init(&rxq, INT_MAX);
982 rp = np->rx.sring->rsp_prod;
983 rmb(); /* Ensure we see queued responses up to 'rp'. */
987 memcpy(rx, RING_GET_RESPONSE(&np->rx, i), sizeof(*rx));
988 memset(extras, 0, sizeof(rinfo.extras));
991 err = xennet_get_responses(np, &rinfo, rp, &i, &m,
994 if (__predict_false(err)) {
996 (void )mbufq_enqueue(&errq, m);
997 np->stats.rx_errors++;
1001 m->m_pkthdr.rcvif = ifp;
1002 if ( rx->flags & NETRXF_data_validated ) {
1003 /* Tell the stack the checksums are okay */
1005 * XXX this isn't necessarily the case - need to add
1009 m->m_pkthdr.csum_flags |=
1010 (CSUM_IP_CHECKED | CSUM_IP_VALID | CSUM_DATA_VALID
1012 m->m_pkthdr.csum_data = 0xffff;
1015 np->stats.rx_packets++;
1016 np->stats.rx_bytes += m->m_pkthdr.len;
1018 (void )mbufq_enqueue(&rxq, m);
1019 np->rx.rsp_cons = i;
1022 if (pages_flipped) {
1023 /* Some pages are no longer absent... */
1025 balloon_update_driver_allowance(-pages_flipped);
1027 /* Do all the remapping work, and M->P updates, in one big
1030 if (!!xen_feature(XENFEAT_auto_translated_physmap)) {
1031 mcl = np->rx_mcl + pages_flipped;
1032 mcl->op = __HYPERVISOR_mmu_update;
1033 mcl->args[0] = (u_long)np->rx_mmu;
1034 mcl->args[1] = pages_flipped;
1036 mcl->args[3] = DOMID_SELF;
1037 (void)HYPERVISOR_multicall(np->rx_mcl,
1045 * Process all the mbufs after the remapping is complete.
1046 * Break the mbuf chain first though.
1048 while ((m = mbufq_dequeue(&rxq)) != NULL) {
1049 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
1052 * Do we really need to drop the rx lock?
1055 #if __FreeBSD_version >= 700000 && (defined(INET) || defined(INET6))
1056 /* Use LRO if possible */
1057 if ((ifp->if_capenable & IFCAP_LRO) == 0 ||
1058 lro->lro_cnt == 0 || tcp_lro_rx(lro, m, 0)) {
1060 * If LRO fails, pass up to the stack
1063 (*ifp->if_input)(ifp, m);
1066 (*ifp->if_input)(ifp, m);
1071 np->rx.rsp_cons = i;
1073 #if __FreeBSD_version >= 700000 && (defined(INET) || defined(INET6))
1075 * Flush any outstanding LRO work
1077 while (!SLIST_EMPTY(&lro->lro_active)) {
1078 queued = SLIST_FIRST(&lro->lro_active);
1079 SLIST_REMOVE_HEAD(&lro->lro_active, next);
1080 tcp_lro_flush(lro, queued);
1085 /* If we get a callback with very few responses, reduce fill target. */
1086 /* NB. Note exponential increase, linear decrease. */
1087 if (((np->rx.req_prod_pvt - np->rx.sring->rsp_prod) >
1088 ((3*np->rx_target) / 4)) && (--np->rx_target < np->rx_min_target))
1089 np->rx_target = np->rx_min_target;
1092 network_alloc_rx_buffers(np);
1094 RING_FINAL_CHECK_FOR_RESPONSES(&np->rx, work_to_do);
1095 } while (work_to_do);
1099 xn_txeof(struct netfront_info *np)
1104 netif_tx_response_t *txr;
1107 XN_TX_LOCK_ASSERT(np);
1109 if (!netfront_carrier_ok(np))
1115 prod = np->tx.sring->rsp_prod;
1116 rmb(); /* Ensure we see responses up to 'rp'. */
1118 for (i = np->tx.rsp_cons; i != prod; i++) {
1119 txr = RING_GET_RESPONSE(&np->tx, i);
1120 if (txr->status == NETIF_RSP_NULL)
1123 if (txr->status != NETIF_RSP_OKAY) {
1124 printf("%s: WARNING: response is %d!\n",
1125 __func__, txr->status);
1128 m = np->tx_mbufs[id];
1129 KASSERT(m != NULL, ("mbuf not found in xn_tx_chain"));
1130 KASSERT((uintptr_t)m > NET_TX_RING_SIZE,
1131 ("mbuf already on the free list, but we're "
1132 "trying to free it again!"));
1136 * Increment packet count if this is the last
1137 * mbuf of the chain.
1140 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
1141 if (__predict_false(gnttab_query_foreign_access(
1142 np->grant_tx_ref[id]) != 0)) {
1143 panic("%s: grant id %u still in use by the "
1144 "backend", __func__, id);
1146 gnttab_end_foreign_access_ref(
1147 np->grant_tx_ref[id]);
1148 gnttab_release_grant_reference(
1149 &np->gref_tx_head, np->grant_tx_ref[id]);
1150 np->grant_tx_ref[id] = GRANT_REF_INVALID;
1152 np->tx_mbufs[id] = NULL;
1153 add_id_to_freelist(np->tx_mbufs, id);
1154 np->xn_cdata.xn_tx_chain_cnt--;
1156 /* Only mark the queue active if we've freed up at least one slot to try */
1157 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
1159 np->tx.rsp_cons = prod;
1162 * Set a new event, then check for race with update of
1163 * tx_cons. Note that it is essential to schedule a
1164 * callback, no matter how few buffers are pending. Even if
1165 * there is space in the transmit ring, higher layers may
1166 * be blocked because too much data is outstanding: in such
1167 * cases notification from Xen is likely to be the only kick
1170 np->tx.sring->rsp_event =
1171 prod + ((np->tx.sring->req_prod - prod) >> 1) + 1;
1174 } while (prod != np->tx.sring->rsp_prod);
1177 ((np->tx.sring->req_prod - prod) < NET_TX_RING_SIZE)) {
1180 if (np->user_state == UST_OPEN)
1181 netif_wake_queue(dev);
1189 struct netfront_info *np = xsc;
1190 struct ifnet *ifp = np->xn_ifp;
1193 if (!(np->rx.rsp_cons != np->rx.sring->rsp_prod &&
1194 likely(netfront_carrier_ok(np)) &&
1195 ifp->if_drv_flags & IFF_DRV_RUNNING))
1198 if (RING_HAS_UNCONSUMED_RESPONSES(&np->tx)) {
1208 if (ifp->if_drv_flags & IFF_DRV_RUNNING &&
1209 !IFQ_DRV_IS_EMPTY(&ifp->if_snd))
1214 xennet_move_rx_slot(struct netfront_info *np, struct mbuf *m,
1217 int new = xennet_rxidx(np->rx.req_prod_pvt);
1219 KASSERT(np->rx_mbufs[new] == NULL, ("rx_mbufs != NULL"));
1220 np->rx_mbufs[new] = m;
1221 np->grant_rx_ref[new] = ref;
1222 RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->id = new;
1223 RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->gref = ref;
1224 np->rx.req_prod_pvt++;
1228 xennet_get_extras(struct netfront_info *np,
1229 struct netif_extra_info *extras, RING_IDX rp, RING_IDX *cons)
1231 struct netif_extra_info *extra;
1239 if (__predict_false(*cons + 1 == rp)) {
1241 if (net_ratelimit())
1242 WPRINTK("Missing extra info\n");
1248 extra = (struct netif_extra_info *)
1249 RING_GET_RESPONSE(&np->rx, ++(*cons));
1251 if (__predict_false(!extra->type ||
1252 extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) {
1254 if (net_ratelimit())
1255 WPRINTK("Invalid extra type: %d\n",
1260 memcpy(&extras[extra->type - 1], extra, sizeof(*extra));
1263 m = xennet_get_rx_mbuf(np, *cons);
1264 ref = xennet_get_rx_ref(np, *cons);
1265 xennet_move_rx_slot(np, m, ref);
1266 } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE);
1272 xennet_get_responses(struct netfront_info *np,
1273 struct netfront_rx_info *rinfo, RING_IDX rp, RING_IDX *cons,
1275 int *pages_flipped_p)
1277 int pages_flipped = *pages_flipped_p;
1278 struct mmu_update *mmu;
1279 struct multicall_entry *mcl;
1280 struct netif_rx_response *rx = &rinfo->rx;
1281 struct netif_extra_info *extras = rinfo->extras;
1282 struct mbuf *m, *m0, *m_prev;
1283 grant_ref_t ref = xennet_get_rx_ref(np, *cons);
1284 RING_IDX ref_cons = *cons;
1289 m0 = m = m_prev = xennet_get_rx_mbuf(np, *cons);
1291 if (rx->flags & NETRXF_extra_info) {
1292 err = xennet_get_extras(np, extras, rp, cons);
1296 m0->m_pkthdr.len = 0;
1304 DPRINTK("rx->status=%hd rx->offset=%hu frags=%u\n",
1305 rx->status, rx->offset, frags);
1307 if (__predict_false(rx->status < 0 ||
1308 rx->offset + rx->status > PAGE_SIZE)) {
1311 if (net_ratelimit())
1312 WPRINTK("rx->offset: %x, size: %u\n",
1313 rx->offset, rx->status);
1315 xennet_move_rx_slot(np, m, ref);
1320 goto next_skip_queue;
1324 * This definitely indicates a bug, either in this driver or in
1325 * the backend driver. In future this should flag the bad
1326 * situation to the system controller to reboot the backed.
1328 if (ref == GRANT_REF_INVALID) {
1331 if (net_ratelimit())
1332 WPRINTK("Bad rx response id %d.\n", rx->id);
1334 printf("%s: Bad rx response id %d.\n", __func__,rx->id);
1339 if (!np->copying_receiver) {
1340 /* Memory pressure, insufficient buffer
1343 if (!(mfn = gnttab_end_foreign_transfer_ref(ref))) {
1344 WPRINTK("Unfulfilled rx req (id=%d, st=%d).\n",
1345 rx->id, rx->status);
1346 xennet_move_rx_slot(np, m, ref);
1351 if (!xen_feature( XENFEAT_auto_translated_physmap)) {
1352 /* Remap the page. */
1353 void *vaddr = mtod(m, void *);
1356 mcl = np->rx_mcl + pages_flipped;
1357 mmu = np->rx_mmu + pages_flipped;
1359 MULTI_update_va_mapping(mcl, (u_long)vaddr,
1360 (((vm_paddr_t)mfn) << PAGE_SHIFT) | PG_RW |
1361 PG_V | PG_M | PG_A, 0);
1362 pfn = (uintptr_t)m->m_ext.ext_arg1;
1363 mmu->ptr = ((vm_paddr_t)mfn << PAGE_SHIFT) |
1364 MMU_MACHPHYS_UPDATE;
1369 ret = gnttab_end_foreign_access_ref(ref);
1370 KASSERT(ret, ("ret != 0"));
1373 gnttab_release_grant_reference(&np->gref_rx_head, ref);
1379 m->m_len = rx->status;
1380 m->m_data += rx->offset;
1381 m0->m_pkthdr.len += rx->status;
1384 if (!(rx->flags & NETRXF_more_data))
1387 if (*cons + frags == rp) {
1388 if (net_ratelimit())
1389 WPRINTK("Need more frags\n");
1391 printf("%s: cons %u frags %u rp %u, not enough frags\n",
1392 __func__, *cons, frags, rp);
1396 * Note that m can be NULL, if rx->status < 0 or if
1397 * rx->offset + rx->status > PAGE_SIZE above.
1401 rx = RING_GET_RESPONSE(&np->rx, *cons + frags);
1402 m = xennet_get_rx_mbuf(np, *cons + frags);
1405 * m_prev == NULL can happen if rx->status < 0 or if
1406 * rx->offset + * rx->status > PAGE_SIZE above.
1412 * m0 can be NULL if rx->status < 0 or if * rx->offset +
1413 * rx->status > PAGE_SIZE above.
1418 ref = xennet_get_rx_ref(np, *cons + frags);
1419 ref_cons = *cons + frags;
1424 *pages_flipped_p = pages_flipped;
1430 xn_tick_locked(struct netfront_info *sc)
1432 XN_RX_LOCK_ASSERT(sc);
1433 callout_reset(&sc->xn_stat_ch, hz, xn_tick, sc);
1435 /* XXX placeholder for printing debug information */
1441 struct netfront_info *sc;
1450 * \brief Count the number of fragments in an mbuf chain.
1452 * Surprisingly, there isn't an M* macro for this.
1455 xn_count_frags(struct mbuf *m)
1459 for (nfrags = 0; m != NULL; m = m->m_next)
1466 * Given an mbuf chain, make sure we have enough room and then push
1467 * it onto the transmit ring.
1470 xn_assemble_tx_request(struct netfront_info *sc, struct mbuf *m_head)
1480 * Defragment the mbuf if necessary.
1482 nfrags = xn_count_frags(m_head);
1485 * Check to see whether this request is longer than netback
1486 * can handle, and try to defrag it.
1489 * It is a bit lame, but the netback driver in Linux can't
1490 * deal with nfrags > MAX_TX_REQ_FRAGS, which is a quirk of
1491 * the Linux network stack.
1493 if (nfrags > sc->maxfrags) {
1494 m = m_defrag(m_head, M_NOWAIT);
1497 * Defrag failed, so free the mbuf and
1498 * therefore drop the packet.
1506 /* Determine how many fragments now exist */
1507 nfrags = xn_count_frags(m_head);
1510 * Check to see whether the defragmented packet has too many
1511 * segments for the Linux netback driver.
1514 * The FreeBSD TCP stack, with TSO enabled, can produce a chain
1515 * of mbufs longer than Linux can handle. Make sure we don't
1516 * pass a too-long chain over to the other side by dropping the
1517 * packet. It doesn't look like there is currently a way to
1518 * tell the TCP stack to generate a shorter chain of packets.
1520 if (nfrags > MAX_TX_REQ_FRAGS) {
1522 printf("%s: nfrags %d > MAX_TX_REQ_FRAGS %d, netback "
1523 "won't be able to handle it, dropping\n",
1524 __func__, nfrags, MAX_TX_REQ_FRAGS);
1531 * This check should be redundant. We've already verified that we
1532 * have enough slots in the ring to handle a packet of maximum
1533 * size, and that our packet is less than the maximum size. Keep
1534 * it in here as an assert for now just to make certain that
1535 * xn_tx_chain_cnt is accurate.
1537 KASSERT((sc->xn_cdata.xn_tx_chain_cnt + nfrags) <= NET_TX_RING_SIZE,
1538 ("%s: xn_tx_chain_cnt (%d) + nfrags (%d) > NET_TX_RING_SIZE "
1539 "(%d)!", __func__, (int) sc->xn_cdata.xn_tx_chain_cnt,
1540 (int) nfrags, (int) NET_TX_RING_SIZE));
1543 * Start packing the mbufs in this chain into
1544 * the fragment pointers. Stop when we run out
1545 * of fragments or hit the end of the mbuf chain.
1548 otherend_id = xenbus_get_otherend_id(sc->xbdev);
1549 for (m = m_head; m; m = m->m_next) {
1550 netif_tx_request_t *tx;
1553 u_long mfn; /* XXX Wrong type? */
1555 tx = RING_GET_REQUEST(&sc->tx, sc->tx.req_prod_pvt);
1556 id = get_id_from_freelist(sc->tx_mbufs);
1558 panic("%s: was allocated the freelist head!\n",
1560 sc->xn_cdata.xn_tx_chain_cnt++;
1561 if (sc->xn_cdata.xn_tx_chain_cnt > NET_TX_RING_SIZE)
1562 panic("%s: tx_chain_cnt must be <= NET_TX_RING_SIZE\n",
1564 sc->tx_mbufs[id] = m;
1566 ref = gnttab_claim_grant_reference(&sc->gref_tx_head);
1567 KASSERT((short)ref >= 0, ("Negative ref"));
1568 mfn = virt_to_mfn(mtod(m, vm_offset_t));
1569 gnttab_grant_foreign_access_ref(ref, otherend_id,
1570 mfn, GNTMAP_readonly);
1571 tx->gref = sc->grant_tx_ref[id] = ref;
1572 tx->offset = mtod(m, vm_offset_t) & (PAGE_SIZE - 1);
1576 * The first fragment has the entire packet
1577 * size, subsequent fragments have just the
1578 * fragment size. The backend works out the
1579 * true size of the first fragment by
1580 * subtracting the sizes of the other
1583 tx->size = m->m_pkthdr.len;
1586 * The first fragment contains the checksum flags
1587 * and is optionally followed by extra data for
1591 * CSUM_TSO requires checksum offloading.
1592 * Some versions of FreeBSD fail to
1593 * set CSUM_TCP in the CSUM_TSO case,
1594 * so we have to test for CSUM_TSO
1597 if (m->m_pkthdr.csum_flags
1598 & (CSUM_DELAY_DATA | CSUM_TSO)) {
1599 tx->flags |= (NETTXF_csum_blank
1600 | NETTXF_data_validated);
1602 #if __FreeBSD_version >= 700000
1603 if (m->m_pkthdr.csum_flags & CSUM_TSO) {
1604 struct netif_extra_info *gso =
1605 (struct netif_extra_info *)
1606 RING_GET_REQUEST(&sc->tx,
1607 ++sc->tx.req_prod_pvt);
1609 tx->flags |= NETTXF_extra_info;
1611 gso->u.gso.size = m->m_pkthdr.tso_segsz;
1613 XEN_NETIF_GSO_TYPE_TCPV4;
1615 gso->u.gso.features = 0;
1617 gso->type = XEN_NETIF_EXTRA_TYPE_GSO;
1622 tx->size = m->m_len;
1625 tx->flags |= NETTXF_more_data;
1627 sc->tx.req_prod_pvt++;
1629 BPF_MTAP(ifp, m_head);
1631 sc->stats.tx_bytes += m_head->m_pkthdr.len;
1632 sc->stats.tx_packets++;
1638 xn_start_locked(struct ifnet *ifp)
1640 struct netfront_info *sc;
1641 struct mbuf *m_head;
1646 if (!netfront_carrier_ok(sc))
1650 * While we have enough transmit slots available for at least one
1651 * maximum-sized packet, pull mbufs off the queue and put them on
1652 * the transmit ring.
1654 while (xn_tx_slot_available(sc)) {
1655 IF_DEQUEUE(&ifp->if_snd, m_head);
1659 if (xn_assemble_tx_request(sc, m_head) != 0)
1663 RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&sc->tx, notify);
1665 xen_intr_signal(sc->xen_intr_handle);
1667 if (RING_FULL(&sc->tx)) {
1670 netif_stop_queue(dev);
1676 xn_start(struct ifnet *ifp)
1678 struct netfront_info *sc;
1681 xn_start_locked(ifp);
1685 /* equivalent of network_open() in Linux */
1687 xn_ifinit_locked(struct netfront_info *sc)
1695 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1700 network_alloc_rx_buffers(sc);
1701 sc->rx.sring->rsp_event = sc->rx.rsp_cons + 1;
1703 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1704 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
1705 if_link_state_change(ifp, LINK_STATE_UP);
1707 callout_reset(&sc->xn_stat_ch, hz, xn_tick, sc);
1711 xn_ifinit(void *xsc)
1713 struct netfront_info *sc = xsc;
1716 xn_ifinit_locked(sc);
1721 xn_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
1723 struct netfront_info *sc = ifp->if_softc;
1724 struct ifreq *ifr = (struct ifreq *) data;
1726 struct ifaddr *ifa = (struct ifaddr *)data;
1729 int mask, error = 0;
1734 if (ifa->ifa_addr->sa_family == AF_INET) {
1735 ifp->if_flags |= IFF_UP;
1736 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING))
1737 xn_ifinit_locked(sc);
1738 arp_ifinit(ifp, ifa);
1743 error = ether_ioctl(ifp, cmd, data);
1749 /* XXX can we alter the MTU on a VN ?*/
1751 if (ifr->ifr_mtu > XN_JUMBO_MTU)
1756 ifp->if_mtu = ifr->ifr_mtu;
1757 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1763 if (ifp->if_flags & IFF_UP) {
1765 * If only the state of the PROMISC flag changed,
1766 * then just use the 'set promisc mode' command
1767 * instead of reinitializing the entire NIC. Doing
1768 * a full re-init means reloading the firmware and
1769 * waiting for it to start up, which may take a
1773 /* No promiscuous mode with Xen */
1774 if (ifp->if_drv_flags & IFF_DRV_RUNNING &&
1775 ifp->if_flags & IFF_PROMISC &&
1776 !(sc->xn_if_flags & IFF_PROMISC)) {
1777 XN_SETBIT(sc, XN_RX_MODE,
1778 XN_RXMODE_RX_PROMISC);
1779 } else if (ifp->if_drv_flags & IFF_DRV_RUNNING &&
1780 !(ifp->if_flags & IFF_PROMISC) &&
1781 sc->xn_if_flags & IFF_PROMISC) {
1782 XN_CLRBIT(sc, XN_RX_MODE,
1783 XN_RXMODE_RX_PROMISC);
1786 xn_ifinit_locked(sc);
1788 if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
1792 sc->xn_if_flags = ifp->if_flags;
1797 mask = ifr->ifr_reqcap ^ ifp->if_capenable;
1798 if (mask & IFCAP_TXCSUM) {
1799 if (IFCAP_TXCSUM & ifp->if_capenable) {
1800 ifp->if_capenable &= ~(IFCAP_TXCSUM|IFCAP_TSO4);
1801 ifp->if_hwassist &= ~(CSUM_TCP | CSUM_UDP
1802 | CSUM_IP | CSUM_TSO);
1804 ifp->if_capenable |= IFCAP_TXCSUM;
1805 ifp->if_hwassist |= (CSUM_TCP | CSUM_UDP
1809 if (mask & IFCAP_RXCSUM) {
1810 ifp->if_capenable ^= IFCAP_RXCSUM;
1812 #if __FreeBSD_version >= 700000
1813 if (mask & IFCAP_TSO4) {
1814 if (IFCAP_TSO4 & ifp->if_capenable) {
1815 ifp->if_capenable &= ~IFCAP_TSO4;
1816 ifp->if_hwassist &= ~CSUM_TSO;
1817 } else if (IFCAP_TXCSUM & ifp->if_capenable) {
1818 ifp->if_capenable |= IFCAP_TSO4;
1819 ifp->if_hwassist |= CSUM_TSO;
1821 IPRINTK("Xen requires tx checksum offload"
1822 " be enabled to use TSO\n");
1826 if (mask & IFCAP_LRO) {
1827 ifp->if_capenable ^= IFCAP_LRO;
1836 if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
1846 error = ifmedia_ioctl(ifp, ifr, &sc->sc_media, cmd);
1849 error = ether_ioctl(ifp, cmd, data);
1856 xn_stop(struct netfront_info *sc)
1864 callout_stop(&sc->xn_stat_ch);
1866 xn_free_rx_ring(sc);
1867 xn_free_tx_ring(sc);
1869 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
1870 if_link_state_change(ifp, LINK_STATE_DOWN);
1873 /* START of Xenolinux helper functions adapted to FreeBSD */
1875 network_connect(struct netfront_info *np)
1877 int i, requeue_idx, error;
1879 netif_rx_request_t *req;
1880 u_int feature_rx_copy, feature_rx_flip;
1882 error = xs_scanf(XST_NIL, xenbus_get_otherend_path(np->xbdev),
1883 "feature-rx-copy", NULL, "%u", &feature_rx_copy);
1885 feature_rx_copy = 0;
1886 error = xs_scanf(XST_NIL, xenbus_get_otherend_path(np->xbdev),
1887 "feature-rx-flip", NULL, "%u", &feature_rx_flip);
1889 feature_rx_flip = 1;
1892 * Copy packets on receive path if:
1893 * (a) This was requested by user, and the backend supports it; or
1894 * (b) Flipping was requested, but this is unsupported by the backend.
1896 np->copying_receiver = ((MODPARM_rx_copy && feature_rx_copy) ||
1897 (MODPARM_rx_flip && !feature_rx_flip));
1899 /* Recovery procedure: */
1900 error = talk_to_backend(np->xbdev, np);
1904 /* Step 1: Reinitialise variables. */
1905 xn_query_features(np);
1906 xn_configure_features(np);
1907 netif_release_tx_bufs(np);
1909 /* Step 2: Rebuild the RX buffer freelist and the RX ring itself. */
1910 for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) {
1914 if (np->rx_mbufs[i] == NULL)
1917 m = np->rx_mbufs[requeue_idx] = xennet_get_rx_mbuf(np, i);
1918 ref = np->grant_rx_ref[requeue_idx] = xennet_get_rx_ref(np, i);
1920 req = RING_GET_REQUEST(&np->rx, requeue_idx);
1921 pfn = vtophys(mtod(m, vm_offset_t)) >> PAGE_SHIFT;
1923 if (!np->copying_receiver) {
1924 gnttab_grant_foreign_transfer_ref(ref,
1925 xenbus_get_otherend_id(np->xbdev),
1928 gnttab_grant_foreign_access_ref(ref,
1929 xenbus_get_otherend_id(np->xbdev),
1933 req->id = requeue_idx;
1938 np->rx.req_prod_pvt = requeue_idx;
1940 /* Step 3: All public and private state should now be sane. Get
1941 * ready to start sending and receiving packets and give the driver
1942 * domain a kick because we've probably just requeued some
1945 netfront_carrier_on(np);
1946 xen_intr_signal(np->xen_intr_handle);
1950 network_alloc_rx_buffers(np);
1956 xn_query_features(struct netfront_info *np)
1960 device_printf(np->xbdev, "backend features:");
1962 if (xs_scanf(XST_NIL, xenbus_get_otherend_path(np->xbdev),
1963 "feature-sg", NULL, "%d", &val) < 0)
1968 np->maxfrags = MAX_TX_REQ_FRAGS;
1969 printf(" feature-sg");
1972 if (xs_scanf(XST_NIL, xenbus_get_otherend_path(np->xbdev),
1973 "feature-gso-tcpv4", NULL, "%d", &val) < 0)
1976 np->xn_ifp->if_capabilities &= ~(IFCAP_TSO4|IFCAP_LRO);
1978 np->xn_ifp->if_capabilities |= IFCAP_TSO4|IFCAP_LRO;
1979 printf(" feature-gso-tcp4");
1986 xn_configure_features(struct netfront_info *np)
1988 int err, cap_enabled;
1992 if (np->xn_resume &&
1993 ((np->xn_ifp->if_capenable & np->xn_ifp->if_capabilities)
1994 == np->xn_ifp->if_capenable)) {
1995 /* Current options are available, no need to do anything. */
1999 /* Try to preserve as many options as possible. */
2001 cap_enabled = np->xn_ifp->if_capenable;
2003 cap_enabled = UINT_MAX;
2005 #if __FreeBSD_version >= 700000 && (defined(INET) || defined(INET6))
2006 if ((np->xn_ifp->if_capenable & IFCAP_LRO) == (cap_enabled & IFCAP_LRO))
2007 tcp_lro_free(&np->xn_lro);
2009 np->xn_ifp->if_capenable =
2010 np->xn_ifp->if_capabilities & ~(IFCAP_LRO|IFCAP_TSO4) & cap_enabled;
2011 np->xn_ifp->if_hwassist &= ~CSUM_TSO;
2012 #if __FreeBSD_version >= 700000 && (defined(INET) || defined(INET6))
2013 if (xn_enable_lro && (np->xn_ifp->if_capabilities & IFCAP_LRO) ==
2014 (cap_enabled & IFCAP_LRO)) {
2015 err = tcp_lro_init(&np->xn_lro);
2017 device_printf(np->xbdev, "LRO initialization failed\n");
2019 np->xn_lro.ifp = np->xn_ifp;
2020 np->xn_ifp->if_capenable |= IFCAP_LRO;
2023 if ((np->xn_ifp->if_capabilities & IFCAP_TSO4) ==
2024 (cap_enabled & IFCAP_TSO4)) {
2025 np->xn_ifp->if_capenable |= IFCAP_TSO4;
2026 np->xn_ifp->if_hwassist |= CSUM_TSO;
2033 * Create a network device.
2034 * @param dev Newbus device representing this virtual NIC.
2037 create_netdev(device_t dev)
2040 struct netfront_info *np;
2044 np = device_get_softc(dev);
2048 XN_LOCK_INIT(np, xennetif);
2050 ifmedia_init(&np->sc_media, 0, xn_ifmedia_upd, xn_ifmedia_sts);
2051 ifmedia_add(&np->sc_media, IFM_ETHER|IFM_MANUAL, 0, NULL);
2052 ifmedia_set(&np->sc_media, IFM_ETHER|IFM_MANUAL);
2054 np->rx_target = RX_MIN_TARGET;
2055 np->rx_min_target = RX_MIN_TARGET;
2056 np->rx_max_target = RX_MAX_TARGET;
2058 /* Initialise {tx,rx}_skbs to be a free chain containing every entry. */
2059 for (i = 0; i <= NET_TX_RING_SIZE; i++) {
2060 np->tx_mbufs[i] = (void *) ((u_long) i+1);
2061 np->grant_tx_ref[i] = GRANT_REF_INVALID;
2063 np->tx_mbufs[NET_TX_RING_SIZE] = (void *)0;
2065 for (i = 0; i <= NET_RX_RING_SIZE; i++) {
2067 np->rx_mbufs[i] = NULL;
2068 np->grant_rx_ref[i] = GRANT_REF_INVALID;
2071 mbufq_init(&np->xn_rx_batch, INT_MAX);
2073 /* A grant for every tx ring slot */
2074 if (gnttab_alloc_grant_references(NET_TX_RING_SIZE,
2075 &np->gref_tx_head) != 0) {
2076 IPRINTK("#### netfront can't alloc tx grant refs\n");
2080 /* A grant for every rx ring slot */
2081 if (gnttab_alloc_grant_references(RX_MAX_TARGET,
2082 &np->gref_rx_head) != 0) {
2083 WPRINTK("#### netfront can't alloc rx grant refs\n");
2084 gnttab_free_grant_references(np->gref_tx_head);
2089 err = xen_net_read_mac(dev, np->mac);
2093 /* Set up ifnet structure */
2094 ifp = np->xn_ifp = if_alloc(IFT_ETHER);
2096 if_initname(ifp, "xn", device_get_unit(dev));
2097 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
2098 ifp->if_ioctl = xn_ioctl;
2099 ifp->if_output = ether_output;
2100 ifp->if_start = xn_start;
2102 ifp->if_watchdog = xn_watchdog;
2104 ifp->if_init = xn_ifinit;
2105 ifp->if_snd.ifq_maxlen = NET_TX_RING_SIZE - 1;
2107 ifp->if_hwassist = XN_CSUM_FEATURES;
2108 ifp->if_capabilities = IFCAP_HWCSUM;
2109 ifp->if_hw_tsomax = 65536 - (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN);
2110 ifp->if_hw_tsomaxsegcount = MAX_TX_REQ_FRAGS;
2111 ifp->if_hw_tsomaxsegsize = PAGE_SIZE;
2113 ether_ifattach(ifp, np->mac);
2114 callout_init(&np->xn_stat_ch, 1);
2115 netfront_carrier_off(np);
2120 gnttab_free_grant_references(np->gref_tx_head);
2126 * Handle the change of state of the backend to Closing. We must delete our
2127 * device-layer structures now, to ensure that writes are flushed through to
2128 * the backend. Once is this done, we can switch to Closed in
2133 netfront_closing(device_t dev)
2136 struct netfront_info *info = dev->dev_driver_data;
2138 DPRINTK("netfront_closing: %s removed\n", dev->nodename);
2142 xenbus_switch_state(dev, XenbusStateClosed);
2147 netfront_detach(device_t dev)
2149 struct netfront_info *info = device_get_softc(dev);
2151 DPRINTK("%s\n", xenbus_get_node(dev));
2159 netif_free(struct netfront_info *info)
2164 callout_drain(&info->xn_stat_ch);
2165 netif_disconnect_backend(info);
2166 if (info->xn_ifp != NULL) {
2167 ether_ifdetach(info->xn_ifp);
2168 if_free(info->xn_ifp);
2169 info->xn_ifp = NULL;
2171 ifmedia_removeall(&info->sc_media);
2175 netif_disconnect_backend(struct netfront_info *info)
2179 netfront_carrier_off(info);
2183 free_ring(&info->tx_ring_ref, &info->tx.sring);
2184 free_ring(&info->rx_ring_ref, &info->rx.sring);
2186 xen_intr_unbind(&info->xen_intr_handle);
2190 free_ring(int *ref, void *ring_ptr_ref)
2192 void **ring_ptr_ptr = ring_ptr_ref;
2194 if (*ref != GRANT_REF_INVALID) {
2195 /* This API frees the associated storage. */
2196 gnttab_end_foreign_access(*ref, *ring_ptr_ptr);
2197 *ref = GRANT_REF_INVALID;
2199 *ring_ptr_ptr = NULL;
2203 xn_ifmedia_upd(struct ifnet *ifp)
2209 xn_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr)
2211 ifmr->ifm_status = IFM_AVALID|IFM_ACTIVE;
2212 ifmr->ifm_active = IFM_ETHER|IFM_MANUAL;
2215 /* ** Driver registration ** */
2216 static device_method_t netfront_methods[] = {
2217 /* Device interface */
2218 DEVMETHOD(device_probe, netfront_probe),
2219 DEVMETHOD(device_attach, netfront_attach),
2220 DEVMETHOD(device_detach, netfront_detach),
2221 DEVMETHOD(device_shutdown, bus_generic_shutdown),
2222 DEVMETHOD(device_suspend, netfront_suspend),
2223 DEVMETHOD(device_resume, netfront_resume),
2225 /* Xenbus interface */
2226 DEVMETHOD(xenbus_otherend_changed, netfront_backend_changed),
2231 static driver_t netfront_driver = {
2234 sizeof(struct netfront_info),
2236 devclass_t netfront_devclass;
2238 DRIVER_MODULE(xe, xenbusb_front, netfront_driver, netfront_devclass, NULL,