/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2010 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* * MAC Hybrid I/O related code. */ #include <sys/types.h> #include <sys/sdt.h> #include <sys/mac.h> #include <sys/mac_impl.h> #include <sys/mac_client_impl.h> #include <sys/mac_client_priv.h> #include <sys/mac_soft_ring.h> /* * Return the number of shares supported by the specified MAC. */ int mac_share_capable(mac_handle_t mh) { mac_impl_t *mip = (mac_impl_t *)mh; return (mip->mi_share_capab.ms_snum); } /* * Allocate a share to the specified MAC client. Invoked when * mac_client_open() is invoked with MAC_OPEN_FLAGS_SHARES_DESIRED set. */ void i_mac_share_alloc(mac_client_impl_t *mcip) { mac_impl_t *mip = mcip->mci_mip; int rv; i_mac_perim_enter(mip); ASSERT(mcip->mci_share == NULL); if (mac_share_capable((mac_handle_t)mcip->mci_mip) == 0) { DTRACE_PROBE1(i__mac__share__alloc__not__sup, mac_client_impl_t *, mcip); i_mac_perim_exit(mip); return; } rv = mip->mi_share_capab.ms_salloc(mip->mi_share_capab.ms_handle, &mcip->mci_share); DTRACE_PROBE3(i__mac__share__alloc, mac_client_impl_t *, mcip, int, rv, mac_share_handle_t, mcip->mci_share); mcip->mci_state_flags &= ~MCIS_SHARE_BOUND; i_mac_perim_exit(mip); } /* * Free a share previously allocated through i_mac_share_alloc(). * Safely handles the case when no shares were allocated to the MAC client. */ void i_mac_share_free(mac_client_impl_t *mcip) { mac_impl_t *mip = mcip->mci_mip; i_mac_perim_enter(mip); /* MAC clients are required to unbind they shares before freeing them */ ASSERT((mcip->mci_state_flags & MCIS_SHARE_BOUND) == 0); if (mcip->mci_share == NULL) { i_mac_perim_exit(mip); return; } mip->mi_share_capab.ms_sfree(mcip->mci_share); i_mac_perim_exit(mip); } /* * Bind a share. After this operation the rings that were associated * with the MAC client are mapped directly into the corresponding * guest domain. */ int mac_share_bind(mac_client_handle_t mch, uint64_t cookie, uint64_t *rcookie) { mac_client_impl_t *mcip = (mac_client_impl_t *)mch; mac_impl_t *mip = mcip->mci_mip; int rv; i_mac_perim_enter(mip); if (mcip->mci_share == NULL) { i_mac_perim_exit(mip); return (ENOTSUP); } ASSERT((mcip->mci_state_flags & MCIS_SHARE_BOUND) == 0); /* * Temporarly suspend the TX traffic for that client to make sure * there are no in flight packets through a transmit ring * which is being bound to another domain. */ mac_tx_client_quiesce(mch); /* * For the receive path, no traffic will be sent up through * the rings to the IO domain. For TX, we need to ensure * that traffic sent by the MAC client are sent through * the default ring. * * For the transmit path we ensure that packets are sent through the * default ring if the share of the MAC client is bound, see MAC_TX(). */ rv = mip->mi_share_capab.ms_sbind(mcip->mci_share, cookie, rcookie); if (rv == 0) mcip->mci_state_flags |= MCIS_SHARE_BOUND; /* * Resume transmit traffic for the MAC client. */ mac_tx_client_restart(mch); i_mac_perim_exit(mip); return (rv); } /* * Unbind a share. */ void mac_share_unbind(mac_client_handle_t mch) { mac_client_impl_t *mcip = (mac_client_impl_t *)mch; mac_impl_t *mip = mcip->mci_mip; i_mac_perim_enter(mip); if (mcip->mci_share == NULL) { i_mac_perim_exit(mip); return; } mip->mi_share_capab.ms_sunbind(mcip->mci_share); mcip->mci_state_flags &= ~MCIS_SHARE_BOUND; /* * If the link state changed while the share was bound, the * soft rings fanout associated with the client would have not * been updated by mac_fanout_recompute(). Do the check here * now that the share has been unbound. */ mac_fanout_recompute_client(mcip, NULL); i_mac_perim_exit(mip); }