2bbab0af6d
Currently the only reason of refcounting rtentries is the need to report the rtable operation details immediately after the execution. Delaying rtentry reclamation allows to stop refcounting and simplify the code. Additionally, this change allows to reimplement rib_lookup_info(), which is used by some of the customers to get the matching prefix along with nexthops, in more efficient way. The change keeps per-vnet rtzone uma zone. It adds nh_vnet field to nhop_priv to be able to reliably set curvnet even during vnet teardown. Rest of the reference counting code will be removed in the D24867 . Differential Revision: https://reviews.freebsd.org/D24866
98 lines
3.8 KiB
C
98 lines
3.8 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2020 Alexander V. Chernikov
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* This header file contains private definitions for nexthop routing.
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*
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* Header is not intended to be included by the code external to the
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* routing subsystem.
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*/
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#ifndef _NET_ROUTE_NHOP_VAR_H_
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#define _NET_ROUTE_NHOP_VAR_H_
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/* define nhop hash table */
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struct nhop_priv;
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CHT_SLIST_DEFINE(nhops, struct nhop_priv);
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/* produce hash value for an object */
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#define nhops_hash_obj(_obj) hash_priv(_obj)
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/* compare two objects */
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#define nhops_cmp(_one, _two) cmp_priv(_one, _two)
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/* next object accessor */
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#define nhops_next(_obj) (_obj)->nh_next
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struct nh_control {
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struct nhops_head nh_head; /* hash table head */
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struct bitmask_head nh_idx_head; /* nhop index head */
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struct rwlock ctl_lock; /* overall ctl lock */
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struct rib_head *ctl_rh; /* pointer back to rnh */
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struct epoch_context ctl_epoch_ctx; /* epoch ctl helper */
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};
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#define NHOPS_WLOCK(ctl) rw_wlock(&(ctl)->ctl_lock)
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#define NHOPS_RLOCK(ctl) rw_rlock(&(ctl)->ctl_lock)
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#define NHOPS_WUNLOCK(ctl) rw_wunlock(&(ctl)->ctl_lock)
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#define NHOPS_RUNLOCK(ctl) rw_runlock(&(ctl)->ctl_lock)
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#define NHOPS_LOCK_INIT(ctl) rw_init(&(ctl)->ctl_lock, "nhop_ctl")
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#define NHOPS_LOCK_DESTROY(ctl) rw_destroy(&(ctl)->ctl_lock)
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#define NHOPS_WLOCK_ASSERT(ctl) rw_assert(&(ctl)->ctl_lock, RA_WLOCKED)
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/* Control plane-only nhop data */
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struct nhop_object;
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struct nhop_priv {
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uint32_t nh_idx; /* nexthop index */
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uint8_t nh_family; /* address family of the lookup */
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uint16_t nh_type; /* nexthop type */
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void *cb_func; /* function handling additional rewrite caps */
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u_int nh_refcnt; /* number of references, refcount(9) */
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u_int nh_linked; /* refcount(9), == 2 if linked to the list */
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int rt_flags; /* routing flags for the control plane */
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struct nhop_object *nh; /* backreference to the dataplane nhop */
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struct nh_control *nh_control; /* backreference to the rnh */
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struct nhop_priv *nh_next; /* hash table membership */
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struct vnet *nh_vnet; /* vnet nhop belongs to */
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struct epoch_context nh_epoch_ctx; /* epoch data for nhop */
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};
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#define NH_IS_PINNED(_nh) ((_nh)->nh_priv->rt_flags & RTF_PINNED)
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/* nhop.c */
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struct nhop_priv *find_nhop(struct nh_control *ctl,
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const struct nhop_priv *nh_priv);
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int link_nhop(struct nh_control *ctl, struct nhop_priv *nh_priv);
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struct nhop_priv *unlink_nhop(struct nh_control *ctl, struct nhop_priv *nh_priv);
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/* nhop_ctl.c */
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int cmp_priv(const struct nhop_priv *_one, const struct nhop_priv *_two);
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#endif
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