2 * Copyright (c) 2011, Bryan Venteicher <bryanv@FreeBSD.org>
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 unmodified, this list of conditions, and the following
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #ifndef _IF_VTNETVAR_H
30 #define _IF_VTNETVAR_H
32 struct vtnet_statistics {
33 unsigned long mbuf_alloc_failed;
35 unsigned long rx_frame_too_large;
36 unsigned long rx_enq_replacement_failed;
37 unsigned long rx_mergeable_failed;
38 unsigned long rx_csum_bad_ethtype;
39 unsigned long rx_csum_bad_start;
40 unsigned long rx_csum_bad_ipproto;
41 unsigned long rx_csum_bad_offset;
42 unsigned long rx_csum_failed;
43 unsigned long rx_csum_offloaded;
44 unsigned long rx_task_rescheduled;
46 unsigned long tx_csum_offloaded;
47 unsigned long tx_tso_offloaded;
48 unsigned long tx_csum_bad_ethtype;
49 unsigned long tx_tso_bad_ethtype;
50 unsigned long tx_task_rescheduled;
55 struct ifnet *vtnet_ifp;
59 #define VTNET_FLAG_LINK 0x0001
60 #define VTNET_FLAG_SUSPENDED 0x0002
61 #define VTNET_FLAG_CTRL_VQ 0x0004
62 #define VTNET_FLAG_CTRL_RX 0x0008
63 #define VTNET_FLAG_VLAN_FILTER 0x0010
64 #define VTNET_FLAG_TSO_ECN 0x0020
65 #define VTNET_FLAG_MRG_RXBUFS 0x0040
66 #define VTNET_FLAG_LRO_NOMRG 0x0080
68 struct virtqueue *vtnet_rx_vq;
69 struct virtqueue *vtnet_tx_vq;
70 struct virtqueue *vtnet_ctrl_vq;
75 int vtnet_rx_process_limit;
76 int vtnet_rx_mbuf_size;
77 int vtnet_rx_mbuf_count;
79 int vtnet_watchdog_timer;
80 uint64_t vtnet_features;
82 struct vtnet_statistics vtnet_stats;
84 struct callout vtnet_tick_ch;
86 eventhandler_tag vtnet_vlan_attach;
87 eventhandler_tag vtnet_vlan_detach;
89 struct ifmedia vtnet_media;
91 * Fake media type; the host does not provide us with
92 * any real media information.
94 #define VTNET_MEDIATYPE (IFM_ETHER | IFM_1000_T | IFM_FDX)
95 char vtnet_hwaddr[ETHER_ADDR_LEN];
97 struct vtnet_mac_filter *vtnet_mac_filter;
99 * During reset, the host's VLAN filtering table is lost. The
100 * array below is used to restore all the VLANs configured on
101 * this interface after a reset.
103 #define VTNET_VLAN_SHADOW_SIZE (4096 / 32)
105 uint32_t vtnet_vlan_shadow[VTNET_VLAN_SHADOW_SIZE];
107 char vtnet_mtx_name[16];
111 * When mergeable buffers are not negotiated, the vtnet_rx_header structure
112 * below is placed at the beginning of the mbuf data. Use 4 bytes of pad to
113 * both keep the VirtIO header and the data non-contiguous and to keep the
114 * frame's payload 4 byte aligned.
116 * When mergeable buffers are negotiated, the host puts the VirtIO header in
117 * the beginning of the first mbuf's data.
119 #define VTNET_RX_HEADER_PAD 4
120 struct vtnet_rx_header {
121 struct virtio_net_hdr vrh_hdr;
122 char vrh_pad[VTNET_RX_HEADER_PAD];
126 * For each outgoing frame, the vtnet_tx_header below is allocated from
127 * the vtnet_tx_header_zone.
129 struct vtnet_tx_header {
131 struct virtio_net_hdr hdr;
132 struct virtio_net_hdr_mrg_rxbuf mhdr;
135 struct mbuf *vth_mbuf;
139 * The VirtIO specification does not place a limit on the number of MAC
140 * addresses the guest driver may request to be filtered. In practice,
141 * the host is constrained by available resources. To simplify this driver,
142 * impose a reasonably high limit of MAC addresses we will filter before
143 * falling back to promiscuous or all-multicast modes.
145 #define VTNET_MAX_MAC_ENTRIES 128
147 struct vtnet_mac_table {
149 uint8_t macs[VTNET_MAX_MAC_ENTRIES][ETHER_ADDR_LEN];
152 struct vtnet_mac_filter {
153 struct vtnet_mac_table vmf_unicast;
154 uint32_t vmf_pad; /* Make tables non-contiguous. */
155 struct vtnet_mac_table vmf_multicast;
159 * The MAC filter table is malloc(9)'d when needed. Ensure it will
160 * always fit in one segment.
162 CTASSERT(sizeof(struct vtnet_mac_filter) <= PAGE_SIZE);
164 #define VTNET_WATCHDOG_TIMEOUT 5
165 #define VTNET_CSUM_OFFLOAD (CSUM_TCP | CSUM_UDP | CSUM_SCTP)
167 /* Features desired/implemented by this driver. */
168 #define VTNET_FEATURES \
169 (VIRTIO_NET_F_MAC | \
170 VIRTIO_NET_F_STATUS | \
171 VIRTIO_NET_F_CTRL_VQ | \
172 VIRTIO_NET_F_CTRL_RX | \
173 VIRTIO_NET_F_CTRL_VLAN | \
174 VIRTIO_NET_F_CSUM | \
175 VIRTIO_NET_F_HOST_TSO4 | \
176 VIRTIO_NET_F_HOST_TSO6 | \
177 VIRTIO_NET_F_HOST_ECN | \
178 VIRTIO_NET_F_GUEST_CSUM | \
179 VIRTIO_NET_F_GUEST_TSO4 | \
180 VIRTIO_NET_F_GUEST_TSO6 | \
181 VIRTIO_NET_F_GUEST_ECN | \
182 VIRTIO_NET_F_MRG_RXBUF | \
183 VIRTIO_RING_F_INDIRECT_DESC)
186 * The VIRTIO_NET_F_GUEST_TSO[46] features permit the host to send us
187 * frames larger than 1514 bytes. We do not yet support software LRO
190 #define VTNET_LRO_FEATURES (VIRTIO_NET_F_GUEST_TSO4 | \
191 VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN)
193 #define VTNET_MAX_MTU 65536
194 #define VTNET_MAX_RX_SIZE 65550
197 * Used to preallocate the Vq indirect descriptors. The first segment
198 * is reserved for the header.
200 #define VTNET_MIN_RX_SEGS 2
201 #define VTNET_MAX_RX_SEGS 34
202 #define VTNET_MAX_TX_SEGS 34
205 * Assert we can receive and transmit the maximum with regular
208 CTASSERT(((VTNET_MAX_RX_SEGS - 1) * MCLBYTES) >= VTNET_MAX_RX_SIZE);
209 CTASSERT(((VTNET_MAX_TX_SEGS - 1) * MCLBYTES) >= VTNET_MAX_MTU);
212 * Determine how many mbufs are in each receive buffer. For LRO without
213 * mergeable descriptors, we must allocate an mbuf chain large enough to
214 * hold both the vtnet_rx_header and the maximum receivable data.
216 #define VTNET_NEEDED_RX_MBUFS(_sc) \
217 ((_sc)->vtnet_flags & VTNET_FLAG_LRO_NOMRG) == 0 ? 1 : \
218 howmany(sizeof(struct vtnet_rx_header) + VTNET_MAX_RX_SIZE, \
219 (_sc)->vtnet_rx_mbuf_size)
221 #define VTNET_MTX(_sc) &(_sc)->vtnet_mtx
222 #define VTNET_LOCK(_sc) mtx_lock(VTNET_MTX((_sc)))
223 #define VTNET_UNLOCK(_sc) mtx_unlock(VTNET_MTX((_sc)))
224 #define VTNET_LOCK_DESTROY(_sc) mtx_destroy(VTNET_MTX((_sc)))
225 #define VTNET_LOCK_ASSERT(_sc) mtx_assert(VTNET_MTX((_sc)), MA_OWNED)
226 #define VTNET_LOCK_ASSERT_NOTOWNED(_sc) \
227 mtx_assert(VTNET_MTX((_sc)), MA_NOTOWNED)
229 #define VTNET_LOCK_INIT(_sc) do { \
230 snprintf((_sc)->vtnet_mtx_name, sizeof((_sc)->vtnet_mtx_name), \
231 "%s", device_get_nameunit((_sc)->vtnet_dev)); \
232 mtx_init(VTNET_MTX((_sc)), (_sc)->vtnet_mtx_name, \
233 "VTNET Core Lock", MTX_DEF); \
236 #endif /* _IF_VTNETVAR_H */