1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 /*
27 * MAC Hybrid I/O related code.
28 */
29
30 #include <sys/types.h>
31 #include <sys/sdt.h>
32 #include <sys/mac.h>
33 #include <sys/mac_impl.h>
34 #include <sys/mac_client_impl.h>
35 #include <sys/mac_client_priv.h>
36 #include <sys/mac_soft_ring.h>
37
38
39 /*
40 * Return the number of shares supported by the specified MAC.
41 */
42 int
mac_share_capable(mac_handle_t mh)43 mac_share_capable(mac_handle_t mh)
44 {
45 mac_impl_t *mip = (mac_impl_t *)mh;
46
47 return (mip->mi_share_capab.ms_snum);
48 }
49
50
51 /*
52 * Allocate a share to the specified MAC client. Invoked when
53 * mac_client_open() is invoked with MAC_OPEN_FLAGS_SHARES_DESIRED set.
54 */
55 void
i_mac_share_alloc(mac_client_impl_t * mcip)56 i_mac_share_alloc(mac_client_impl_t *mcip)
57 {
58 mac_impl_t *mip = mcip->mci_mip;
59 int rv;
60
61 i_mac_perim_enter(mip);
62
63 ASSERT(mcip->mci_share == 0);
64
65 if (mac_share_capable((mac_handle_t)mcip->mci_mip) == 0) {
66 DTRACE_PROBE1(i__mac__share__alloc__not__sup,
67 mac_client_impl_t *, mcip);
68 i_mac_perim_exit(mip);
69 return;
70 }
71
72 rv = mip->mi_share_capab.ms_salloc(mip->mi_share_capab.ms_handle,
73 &mcip->mci_share);
74 DTRACE_PROBE3(i__mac__share__alloc, mac_client_impl_t *, mcip,
75 int, rv, mac_share_handle_t, mcip->mci_share);
76
77 mcip->mci_state_flags &= ~MCIS_SHARE_BOUND;
78
79 i_mac_perim_exit(mip);
80 }
81
82
83 /*
84 * Free a share previously allocated through i_mac_share_alloc().
85 * Safely handles the case when no shares were allocated to the MAC client.
86 */
87 void
i_mac_share_free(mac_client_impl_t * mcip)88 i_mac_share_free(mac_client_impl_t *mcip)
89 {
90 mac_impl_t *mip = mcip->mci_mip;
91
92 i_mac_perim_enter(mip);
93
94 /* MAC clients are required to unbind they shares before freeing them */
95 ASSERT((mcip->mci_state_flags & MCIS_SHARE_BOUND) == 0);
96
97 if (mcip->mci_share == 0) {
98 i_mac_perim_exit(mip);
99 return;
100 }
101
102 mip->mi_share_capab.ms_sfree(mcip->mci_share);
103 i_mac_perim_exit(mip);
104 }
105
106
107 /*
108 * Bind a share. After this operation the rings that were associated
109 * with the MAC client are mapped directly into the corresponding
110 * guest domain.
111 */
112 int
mac_share_bind(mac_client_handle_t mch,uint64_t cookie,uint64_t * rcookie)113 mac_share_bind(mac_client_handle_t mch, uint64_t cookie, uint64_t *rcookie)
114 {
115 mac_client_impl_t *mcip = (mac_client_impl_t *)mch;
116 mac_impl_t *mip = mcip->mci_mip;
117 int rv;
118
119 i_mac_perim_enter(mip);
120
121 if (mcip->mci_share == 0) {
122 i_mac_perim_exit(mip);
123 return (ENOTSUP);
124 }
125
126 ASSERT((mcip->mci_state_flags & MCIS_SHARE_BOUND) == 0);
127
128 /*
129 * Temporarly suspend the TX traffic for that client to make sure
130 * there are no in flight packets through a transmit ring
131 * which is being bound to another domain.
132 */
133 mac_tx_client_quiesce(mch);
134
135 /*
136 * For the receive path, no traffic will be sent up through
137 * the rings to the IO domain. For TX, we need to ensure
138 * that traffic sent by the MAC client are sent through
139 * the default ring.
140 *
141 * For the transmit path we ensure that packets are sent through the
142 * default ring if the share of the MAC client is bound, see MAC_TX().
143 */
144
145 rv = mip->mi_share_capab.ms_sbind(mcip->mci_share, cookie, rcookie);
146 if (rv == 0)
147 mcip->mci_state_flags |= MCIS_SHARE_BOUND;
148
149 /*
150 * Resume transmit traffic for the MAC client.
151 */
152 mac_tx_client_restart(mch);
153
154 i_mac_perim_exit(mip);
155
156 return (rv);
157 }
158
159
160 /*
161 * Unbind a share.
162 */
163 void
mac_share_unbind(mac_client_handle_t mch)164 mac_share_unbind(mac_client_handle_t mch)
165 {
166 mac_client_impl_t *mcip = (mac_client_impl_t *)mch;
167 mac_impl_t *mip = mcip->mci_mip;
168
169 i_mac_perim_enter(mip);
170
171 if (mcip->mci_share == 0) {
172 i_mac_perim_exit(mip);
173 return;
174 }
175
176 mip->mi_share_capab.ms_sunbind(mcip->mci_share);
177
178 mcip->mci_state_flags &= ~MCIS_SHARE_BOUND;
179
180 /*
181 * If the link state changed while the share was bound, the
182 * soft rings fanout associated with the client would have not
183 * been updated by mac_fanout_recompute(). Do the check here
184 * now that the share has been unbound.
185 */
186 mac_fanout_recompute_client(mcip, NULL);
187
188 i_mac_perim_exit(mip);
189 }
190