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c782ea8bb5
Move the type and function pointers for operations on existing send tags (modify, query, next, free) out of 'struct ifnet' and into a new 'struct if_snd_tag_sw'. A pointer to this structure is added to the generic part of send tags and is initialized by m_snd_tag_init() (which now accepts a switch structure as a new argument in place of the type). Previously, device driver ifnet methods switched on the type to call type-specific functions. Now, those type-specific functions are saved in the switch structure and invoked directly. In addition, this more gracefully permits multiple implementations of the same tag within a driver. In particular, NIC TLS for future Chelsio adapters will use a different implementation than the existing NIC TLS support for T6 adapters. Reviewed by: gallatin, hselasky, kib (older version) Sponsored by: Chelsio Communications Differential Revision: https://reviews.freebsd.org/D31572
144 lines
3.4 KiB
C
144 lines
3.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2009 Robert N. M. Watson
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* All rights reserved.
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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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/*
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* When an interface has been detached but not yet freed, we set the various
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* ifnet function pointers to "ifdead" versions. This prevents unexpected
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* calls from the network stack into the device driver after if_detach() has
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* returned.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <net/if_var.h>
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static int
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ifdead_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa,
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struct route *ro)
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{
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m_freem(m);
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return (ENXIO);
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}
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static void
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ifdead_input(struct ifnet *ifp, struct mbuf *m)
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{
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m_freem(m);
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}
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static void
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ifdead_start(struct ifnet *ifp)
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{
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}
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static int
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ifdead_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
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{
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return (ENXIO);
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}
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static int
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ifdead_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
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struct sockaddr *sa)
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{
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*llsa = NULL;
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return (ENXIO);
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}
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static void
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ifdead_qflush(struct ifnet *ifp)
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{
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}
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static int
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ifdead_transmit(struct ifnet *ifp, struct mbuf *m)
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{
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m_freem(m);
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return (ENXIO);
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}
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static uint64_t
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ifdead_get_counter(struct ifnet *ifp, ift_counter cnt)
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{
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return (0);
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}
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static int
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ifdead_snd_tag_alloc(struct ifnet *ifp, union if_snd_tag_alloc_params *params,
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struct m_snd_tag **ppmt)
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{
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return (EOPNOTSUPP);
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}
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static void
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ifdead_ratelimit_query(struct ifnet *ifp __unused,
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struct if_ratelimit_query_results *q)
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{
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/*
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* This guy does not support
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* this interface. Not sure
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* why we would specify a
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* flag on the interface
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* that says we do.
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*/
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q->rate_table = NULL;
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q->flags = RT_NOSUPPORT;
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q->max_flows = 0;
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q->number_of_rates = 0;
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}
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void
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if_dead(struct ifnet *ifp)
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{
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ifp->if_output = ifdead_output;
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ifp->if_input = ifdead_input;
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ifp->if_start = ifdead_start;
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ifp->if_ioctl = ifdead_ioctl;
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ifp->if_resolvemulti = ifdead_resolvemulti;
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ifp->if_qflush = ifdead_qflush;
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ifp->if_transmit = ifdead_transmit;
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ifp->if_get_counter = ifdead_get_counter;
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ifp->if_snd_tag_alloc = ifdead_snd_tag_alloc;
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ifp->if_ratelimit_query = ifdead_ratelimit_query;
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}
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