a6d768d845
This feature enables applications to ask netmap to transmit or receive packets starting at a user-specified offset from the beginning of the netmap buffer. This is meant to ease those packet manipulation operations such as pushing or popping packet headers, that may be useful to implement software switches, routers and other packet processors. To use the feature, drivers (e.g., iflib, vtnet, etc.) must have explicit support. This change does not add support for any driver, but introduces the necessary kernel changes. However, offsets support is already included for VALE ports and pipes.
200 lines
7.5 KiB
C
200 lines
7.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (C) 2013-2018 Universita` di Pisa
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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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* $FreeBSD$
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*/
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#ifndef _NET_NETMAP_BDG_H_
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#define _NET_NETMAP_BDG_H_
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#if defined(__FreeBSD__)
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#define BDG_RWLOCK_T struct rwlock // struct rwlock
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#define BDG_RWINIT(b) \
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rw_init_flags(&(b)->bdg_lock, "bdg lock", RW_NOWITNESS)
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#define BDG_WLOCK(b) rw_wlock(&(b)->bdg_lock)
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#define BDG_WUNLOCK(b) rw_wunlock(&(b)->bdg_lock)
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#define BDG_RLOCK(b) rw_rlock(&(b)->bdg_lock)
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#define BDG_RTRYLOCK(b) rw_try_rlock(&(b)->bdg_lock)
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#define BDG_RUNLOCK(b) rw_runlock(&(b)->bdg_lock)
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#define BDG_RWDESTROY(b) rw_destroy(&(b)->bdg_lock)
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#endif /* __FreeBSD__ */
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/*
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* The following bridge-related functions are used by other
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* kernel modules.
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*
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* VALE only supports unicast or broadcast. The lookup
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* function can return 0 .. NM_BDG_MAXPORTS-1 for regular ports,
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* NM_BDG_MAXPORTS for broadcast, NM_BDG_MAXPORTS+1 to indicate
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* drop.
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*/
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typedef uint32_t (*bdg_lookup_fn_t)(struct nm_bdg_fwd *ft, uint8_t *ring_nr,
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struct netmap_vp_adapter *, void *private_data);
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typedef int (*bdg_config_fn_t)(struct nm_ifreq *);
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typedef void (*bdg_dtor_fn_t)(const struct netmap_vp_adapter *);
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typedef void *(*bdg_update_private_data_fn_t)(void *private_data, void *callback_data, int *error);
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typedef int (*bdg_vp_create_fn_t)(struct nmreq_header *hdr,
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struct ifnet *ifp, struct netmap_mem_d *nmd,
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struct netmap_vp_adapter **ret);
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typedef int (*bdg_bwrap_attach_fn_t)(const char *nr_name, struct netmap_adapter *hwna);
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struct netmap_bdg_ops {
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bdg_lookup_fn_t lookup;
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bdg_config_fn_t config;
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bdg_dtor_fn_t dtor;
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bdg_vp_create_fn_t vp_create;
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bdg_bwrap_attach_fn_t bwrap_attach;
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char name[IFNAMSIZ];
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};
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int netmap_bwrap_attach(const char *name, struct netmap_adapter *, struct netmap_bdg_ops *);
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int netmap_bdg_regops(const char *name, struct netmap_bdg_ops *bdg_ops, void *private_data, void *auth_token);
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#define NM_BRIDGES 8 /* number of bridges */
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#define NM_BDG_MAXPORTS 254 /* up to 254 */
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#define NM_BDG_BROADCAST NM_BDG_MAXPORTS
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#define NM_BDG_NOPORT (NM_BDG_MAXPORTS+1)
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/* XXX Should go away after fixing find_bridge() - Michio */
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#define NM_BDG_HASH 1024 /* forwarding table entries */
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/* XXX revise this */
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struct nm_hash_ent {
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uint64_t mac; /* the top 2 bytes are the epoch */
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uint64_t ports;
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};
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/* Default size for the Maximum Frame Size. */
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#define NM_BDG_MFS_DEFAULT 1514
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/*
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* nm_bridge is a descriptor for a VALE switch.
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* Interfaces for a bridge are all in bdg_ports[].
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* The array has fixed size, an empty entry does not terminate
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* the search, but lookups only occur on attach/detach so we
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* don't mind if they are slow.
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*
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* The bridge is non blocking on the transmit ports: excess
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* packets are dropped if there is no room on the output port.
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*
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* bdg_lock protects accesses to the bdg_ports array.
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* This is a rw lock (or equivalent).
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*/
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#define NM_BDG_IFNAMSIZ IFNAMSIZ
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struct nm_bridge {
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/* XXX what is the proper alignment/layout ? */
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BDG_RWLOCK_T bdg_lock; /* protects bdg_ports */
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int bdg_namelen;
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uint32_t bdg_active_ports;
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char bdg_basename[NM_BDG_IFNAMSIZ];
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/* Indexes of active ports (up to active_ports)
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* and all other remaining ports.
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*/
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uint32_t bdg_port_index[NM_BDG_MAXPORTS];
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/* used by netmap_bdg_detach_common() */
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uint32_t tmp_bdg_port_index[NM_BDG_MAXPORTS];
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struct netmap_vp_adapter *bdg_ports[NM_BDG_MAXPORTS];
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/*
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* Programmable lookup functions to figure out the destination port.
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* It returns either of an index of the destination port,
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* NM_BDG_BROADCAST to broadcast this packet, or NM_BDG_NOPORT not to
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* forward this packet. ring_nr is the source ring index, and the
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* function may overwrite this value to forward this packet to a
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* different ring index.
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* The function is set by netmap_bdg_regops().
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*/
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struct netmap_bdg_ops bdg_ops;
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struct netmap_bdg_ops bdg_saved_ops;
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/*
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* Contains the data structure used by the bdg_ops.lookup function.
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* By default points to *ht which is allocated on attach and used by the default lookup
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* otherwise will point to the data structure received by netmap_bdg_regops().
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*/
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void *private_data;
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struct nm_hash_ent *ht;
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/* Currently used to specify if the bridge is still in use while empty and
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* if it has been put in exclusive mode by an external module, see netmap_bdg_regops()
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* and netmap_bdg_create().
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*/
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#define NM_BDG_ACTIVE 1
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#define NM_BDG_EXCLUSIVE 2
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#define NM_BDG_NEED_BWRAP 4
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uint8_t bdg_flags;
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#ifdef CONFIG_NET_NS
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struct net *ns;
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#endif /* CONFIG_NET_NS */
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};
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static inline void *
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nm_bdg_get_auth_token(struct nm_bridge *b)
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{
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return b->ht;
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}
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/* bridge not in exclusive mode ==> always valid
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* bridge in exclusive mode (created through netmap_bdg_create()) ==> check authentication token
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*/
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static inline int
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nm_bdg_valid_auth_token(struct nm_bridge *b, void *auth_token)
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{
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return !(b->bdg_flags & NM_BDG_EXCLUSIVE) || b->ht == auth_token;
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}
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int netmap_get_bdg_na(struct nmreq_header *hdr, struct netmap_adapter **na,
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struct netmap_mem_d *nmd, int create, struct netmap_bdg_ops *ops);
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struct nm_bridge *nm_find_bridge(const char *name, int create, struct netmap_bdg_ops *ops);
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int netmap_bdg_free(struct nm_bridge *b);
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void netmap_bdg_detach_common(struct nm_bridge *b, int hw, int sw);
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int netmap_vp_bdg_ctl(struct nmreq_header *hdr, struct netmap_adapter *na);
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int netmap_bwrap_reg(struct netmap_adapter *, int onoff);
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int netmap_bdg_detach_locked(struct nmreq_header *hdr, void *auth_token);
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int netmap_vp_reg(struct netmap_adapter *na, int onoff);
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int netmap_vp_rxsync(struct netmap_kring *kring, int flags);
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int netmap_bwrap_intr_notify(struct netmap_kring *kring, int flags);
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int netmap_bwrap_notify(struct netmap_kring *kring, int flags);
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int netmap_bwrap_attach_common(struct netmap_adapter *na,
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struct netmap_adapter *hwna);
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int netmap_bwrap_krings_create_common(struct netmap_adapter *na);
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void netmap_bwrap_krings_delete_common(struct netmap_adapter *na);
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struct nm_bridge *netmap_init_bridges2(u_int);
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void netmap_uninit_bridges2(struct nm_bridge *, u_int);
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int netmap_bdg_update_private_data(const char *name, bdg_update_private_data_fn_t callback,
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void *callback_data, void *auth_token);
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int netmap_bdg_config(struct nm_ifreq *nifr);
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int nm_is_bwrap(struct netmap_adapter *);
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#define NM_NEED_BWRAP (-2)
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#endif /* _NET_NETMAP_BDG_H_ */
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