Optionally bind ktls threads to NUMA domains

[FreeBSD/FreeBSD.git] / lib / libnetmap / libnetmap.h

/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (C) 2018 Universita` di Pisa
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * $FreeBSD$
 */

#ifndef LIBNETMAP_H_
#define LIBNETMAP_H_
/* if thread-safety is not needed, define LIBNETMAP_NOTHREADSAFE before including
 * this file.
 */

/* NOTE: we include net/netmap_user.h without defining NETMAP_WITH_LIBS, which
 * is deprecated. If you still need it, please define NETMAP_WITH_LIBS and
 * include net/netmap_user.h before including this file.
 */
#include <net/netmap_user.h>

struct nmctx;
struct nmport_d;
struct nmem_d;

/*
 * A port open specification (portspec for brevity) has the following syntax
 * (square brackets delimit optional parts):
 *
 *     subsystem:vpname[mode][options]
 *
 *  The "subsystem" is denoted by a prefix, possibly followed by an identifier.
 *  There can be several kinds of subsystems, each one selected by a unique
 *  prefix.  Currently defined subsystems are:
 *
 *  netmap              (no id allowed)
 *                      the standard subsystem
 *
 *  vale                (followed by a possibly empty id)
 *                      the vpname is connected to a VALE switch identified by
 *                      the id (an empty id selects the default switch)
 *
 *  The "vpname" has the following syntax:
 *
 *     identifier                       or
 *     identifier1{identifier2          or
 *     identifier1}identifier2
 *
 *  Identifiers are sequences of alphanumeric characters. The part that begins
 *  with either '{' or '}', when present, denotes a netmap pipe opened in the
 *  same memory region as the subsystem:indentifier1 port.
 *
 * The "mode" can be one of the following:
 *
 *      ^               bind all host (sw) ring pairs
 *      ^NN             bind individual host ring pair
 *      *               bind host and NIC ring pairs
 *      -NN             bind individual NIC ring pair
 *      @NN             open the port in the NN memory region
 *      a suffix starting with / and the following flags,
 *      in any order:
 *      x               exclusive access
 *      z               zero copy monitor (both tx and rx)
 *      t               monitor tx side (copy monitor)
 *      r               monitor rx side (copy monitor)
 *      R               bind only RX ring(s)
 *      T               bind only TX ring(s)
 *
 *  The "options" start at the first '@' character not followed by a number.
 *  Each option starts with '@' and has the following syntax:
 *
 *      option                                  (flag option)
 *      option=value                            (single key option)
 *      option:key1=value1,key2=value2,...      (multi-key option)
 *
 *  For multi-key options, the keys can be assigned in any order, but they
 *  cannot be assigned more than once. It is not necessary to assign all the
 *  option keys: unmentioned keys will receive default values.  Some multi-key
 *  options define a default key and also accept the single-key syntax, by
 *  assigning the value to this key.
 *
 *  NOTE: Options may be silently ignored if the port is already open by some
 *  other process.
 *
 *  The currently available options are (default keys, when defined, are marked
 *  with '*'):
 *
 *  share (single-key)
 *                      open the port in the same memory region used by the
 *                      given port name (the port name must be given in
 *                      subsystem:vpname form)
 *
 *  conf  (multi-key)
 *                      specify the rings/slots numbers (effective only on
 *                      ports that are created by the open operation itself,
 *                      and ignored otherwise).
 *
 *                      The keys are:
 *
 *                     *rings           number of tx and rx rings
 *                      tx-rings        number of tx rings
 *                      rx-rings        number of rx rings
 *                      host-rings      number of tx and rx host rings
 *                      host-tx-rings   number of host tx rings
 *                      host-rx-rings   number of host rx rings
 *                      slots           number of slots in each tx and rx
 *                                      ring
 *                      tx-slots        number of slots in each tx ring
 *                      rx-slots        number of slots in each rx ring
 *
 *                      (more specific keys override the less specific ones)
 *                      All keys default to zero if not assigned, and the
 *                      corresponding value will be chosen by netmap.
 *
 *  extmem (multi-key)
 *                      open the port in the memory region obtained by
 *                      mmap()ing the given file.
 *
 *                      The keys are:
 *
 *                     *file            the file to mmap
 *                      if-num          number of pre-allocated netmap_if's
 *                      if-size         size of each netmap_if
 *                      ring-num        number of pre-allocated netmap_ring's
 *                      ring-size       size of each netmap_ring
 *                      buf-num         number of pre-allocated buffers
 *                      buf-size        size of each buffer
 *
 *                      file must be assigned. The other keys default to zero,
 *                      causing netmap to take the corresponding values from
 *                      the priv_{if,ring,buf}_{num,size} sysctls.
 *
 */


/* nmport manipulation */

/* struct nmport_d - describes a netmap port */
struct nmport_d {
        /* see net/netmap.h for the definition of these fields */
        struct nmreq_header hdr;
        struct nmreq_register reg;

        /* all the fields below should be considered read-only */

        /* if the same context is used throughout the program, d1->mem ==
         * d2->mem iff d1 and d2 are using the memory region (i.e., zero
         * copy is possible between the two ports)
         */
        struct nmem_d *mem;

        /* the nmctx used when this nmport_d was created */
        struct nmctx *ctx;

        int register_done;      /* nmport_register() has been called */
        int mmap_done;          /* nmport_mmap() has been called */
        /* pointer to the extmem option contained in the hdr options, if any */
        struct nmreq_opt_extmem *extmem;

        /* the fields below are compatible with nm_open() */
        int fd;                         /* "/dev/netmap", -1 if not open */
        struct netmap_if *nifp;         /* pointer to the netmap_if */
        uint16_t first_tx_ring;
        uint16_t last_tx_ring;
        uint16_t first_rx_ring;
        uint16_t last_rx_ring;
        uint16_t cur_tx_ring;           /* used by nmport_inject */
        uint16_t cur_rx_ring;

        /* LIFO list of cleanup functions (used internally) */
        struct nmport_cleanup_d *clist;
};

/* nmport_open - opens a port from a portspec
 * @portspec    the port opening specification
 *
 * If successful, the function returns a new nmport_d describing a netmap
 * port, opened according to the port specification, ready to be used for rx
 * and/or tx.
 *
 * The rings available for tx are in the [first_tx_ring, last_tx_ring]
 * interval, and similarly for rx. One or both intervals may be empty.
 *
 * When done using it, the nmport_d descriptor must be closed using
 * nmport_close().
 *
 * In case of error, NULL is returned, errno is set to some error, and an
 * error message is sent through the error() method of the current context.
 */
struct nmport_d * nmport_open(const char *portspec);

/* nport_close - close a netmap port
 * @d           the port we want to close
 *
 * Undoes the actions performed by the nmport_open that created d, then
 * frees the descriptor.
 */
void nmport_close(struct nmport_d *d);

/* nmport_inject - sends a packet
 * @d           the port through which we want to send
 * @buf         base address of the packet
 * @size        its size in bytes
 *
 * Sends a packet using the cur_tx_ring and updates the index
 * to use all available tx rings in turn. Note: the packet is copied.
 *
 * Returns 0 on success an -1 on error.
 */
int nmport_inject(struct nmport_d *d, const void *buf, size_t size);

/*
 * the functions below can be used to split the functionality of
 * nmport_open when special features (e.g., extra buffers) are needed
 *
 * The relation among the functions is as follows:
 *
 *                                 |nmport_new
 *              |nmport_prepare  = |
 *              |                  |nmport_parse
 * nmport_open =|
 *              |                  |nmport_register
 *              |nmport_open_desc =|
 *                                 |nmport_mmap
 *
 */

/* nmport_new - create a new nmport_d
 *
 * Creates a new nmport_d using the malloc() method of the current default
 * context. Returns NULL on error, setting errno to an error value.
 */
struct nmport_d *nmport_new(void);

/* nmport_parse - fills the nmport_d netmap-register request
 * @d           the nmport to be filled
 * @portspec    the port opening specification
 *
 * This function parses the portspec and initizalizes the @d->hdr and @d->reg
 * fields. It may need to allocate a list of options. If an extmem option is
 * found, it may also mmap() the corresponding file.
 *
 * It returns 0 on success. On failure it returns -1, sets errno to an error
 * value and sends an error message to the error() method of the context used
 * when @d was created. Moreover, *@d is left unchanged.
 */
int nmport_parse(struct nmport_d *d, const char *portspec);

/* nmport_register - registers the port with netmap
 * @d           the nmport to be registered
 *
 * This function obtains a netmap file descriptor and registers the port with
 * netmap. The @d->hdr and @d->reg data structures must have been previously
 * initialized (via nmport_parse() or otherwise).
 *
 * It returns 0 on success. On failure it returns -1, sets errno to an error
 * value and sends an error message to the error() method of the context used
 * when @d was created. Moreover, *@d is left unchanged.
 */
int nmport_register(struct nmport_d *);

/* nmport_mmap - maps the port resources into the process memory
 * @d           the nmport to be mapped
 *
 * The port must have been previously been registered using nmport_register.
 *
 * Note that if extmem is used (either via an option or by calling an
 * nmport_extmem_* function before nmport_register()), no new mmap() is issued.
 *
 * It returns 0 on success. On failure it returns -1, sets errno to an error
 * value and sends an error message to the error() method of the context used
 * when @d was created. Moreover, *@d is left unchanged.
 */
int nmport_mmap(struct nmport_d *);

/* the following functions undo the actions of nmport_new(), nmport_parse(),
 * nmport_register() and nmport_mmap(), respectively.
 */
void nmport_delete(struct nmport_d *);
void nmport_undo_parse(struct nmport_d *);
void nmport_undo_register(struct nmport_d *);
void nmport_undo_mmap(struct nmport_d *);

/* nmport_prepare - create a port descriptor, but do not open it
 * @portspec    the port opening specification
 *
 * This functions creates a new nmport_d and initializes it according to
 * @portspec. It is equivalent to nmport_new() followed by nmport_parse().
 *
 * It returns 0 on success. On failure it returns -1, sets errno to an error
 * value and sends an error message to the error() method of the context used
 * when @d was created. Moreover, *@d is left unchanged.
 */
struct nmport_d *nmport_prepare(const char *portspec);

/* nmport_open_desc - open an initialized port descriptor
 * @d           the descriptor we want to open
 *
 * Registers the port with netmap and maps the rings and buffers into the
 * process memory. It is equivalent to nmport_register() followed by
 * nmport_mmap().
 *
 * It returns 0 on success. On failure it returns -1, sets errno to an error
 * value and sends an error message to the error() method of the context used
 * when @d was created. Moreover, *@d is left unchanged.
 */
int nmport_open_desc(struct nmport_d *d);

/* the following functions undo the actions of nmport_prepare()
 * and nmport_open_desc(), respectively.
 */
void nmport_undo_prepare(struct nmport_d *);
void nmport_undo_open_desc(struct nmport_d *);

/* nmport_clone - copy an nmport_d
 * @d           the nmport_d we want to copy
 *
 * Copying an nmport_d by hand should be avoided, since adjustments are needed
 * and some part of the state cannot be easily duplicated. This function
 * creates a copy of @d in a safe way. The returned nmport_d contains
 * nmreq_header and nmreq_register structures equivalent to those contained in
 * @d, except for the option list, which is ignored. The returned nmport_d is
 * already nmport_prepare()d, but it must still be nmport_open_desc()ed. The
 * new nmport_d uses the same nmctx as @d.
 *
 * If extmem was used for @d, then @d cannot be nmport_clone()d until it has
 * been nmport_register()ed.
 *
 * In case of error, the function returns NULL, sets errno to an error value
 * and sends an error message to the nmctx error() method.
 */
struct nmport_d *nmport_clone(struct nmport_d *);

/* nmport_extmem - use extmem for this port
 * @d           the port we want to use the extmem for
 * @base        the base address of the extmem region
 * @size        the size in bytes of the extmem region
 *
 * the memory that contains the netmap ifs, rings and buffers is usually
 * allocated by netmap and later mmap()ed by the applications. It is sometimes
 * useful to reverse this process, by having the applications allocate some
 * memory (through mmap() or otherwise) and then let netmap use it.  The extmem
 * option can be used to implement this latter strategy. The option can be
 * passed through the portspec using the '@extmem:...' syntax, or
 * programmatically by calling nmport_extmem() or nmport_extmem_from_file()
 * between nmport_parse() and nmport_register() (or between nmport_prepare()
 * and nmport_open_desc()).
 *
 * It returns 0 on success. On failure it returns -1, sets errno to an error
 * value and sends an error message to the error() method of the context used
 * when @d was created. Moreover, *@d is left unchanged.
 */
int nmport_extmem(struct nmport_d *d, void *base, size_t size);

/* nmport_extmem_from_file - use the extmem obtained by mapping a file
 * @d           the port we want to use the extmem for
 * @fname       path of the file we want to map
 *
 * This works like nmport_extmem, but the extmem memory is obtained by
 * mmap()ping @fname. nmport_close() will also automatically munmap() the file.
 *
 * It returns 0 on success. On failure it returns -1, sets errno to an error
 * value and sends an error message to the error() method of the context used
 * when @d was created. Moreover, *@d is left unchanged.
 */
int nmport_extmem_from_file(struct nmport_d *d, const char *fname);

/* nmport_extmem_getinfo - opbtai a pointer to the extmem configuration
 * @d           the port we want to obtain the pointer from
 *
 * Returns a pointer to the nmreq_pools_info structure containing the
 * configuration of the extmem attached to port @d, or NULL if no extmem
 * is attached. This can be used to set the desired configuration before
 * registering the port, or to read the actual configuration after
 * registration.
 */
struct nmreq_pools_info* nmport_extmem_getinfo(struct nmport_d *d);


/* enable/disable options
 *
 * These functions can be used to disable options that the application cannot
 * or doesn't want to handle, or to enable options that require special support
 * from the application and are, therefore, disabled by default. Disabled
 * options will cause an error if encountered during option parsing.
 *
 * If the option is unknown, nmport_disable_option is a NOP, while
 * nmport_enable_option returns -1 and sets errno to EOPNOTSUPP.
 *
 * These functions are not threadsafe and are meant to be used at the beginning
 * of the program.
 */
void nmport_disable_option(const char *opt);
int nmport_enable_option(const char *opt);

/* nmreq manipulation
 *
 * nmreq_header_init - initialize an nmreq_header
 * @hdr         the nmreq_header to initialize
 * @reqtype     the kind of netmap request
 * @body        the body of the request
 *
 * Initialize the nr_version, nr_reqtype and nr_body fields of *@hdr.
 * The other fields are set to zero.
 */
void nmreq_header_init(struct nmreq_header *hdr, uint16_t reqtype, void *body);

/*
 * These functions allow for finer grained parsing of portspecs.  They are used
 * internally by nmport_parse().
 */

/* nmreq_header_decode - initialize an nmreq_header
 * @ppspec:     (in/out) pointer to a pointer to the portspec
 * @hdr:        pointer to the nmreq_header to be initialized
 * @ctx:        pointer to the nmctx to use (for errors)
 *
 * This function fills the @hdr the nr_name field with the port name extracted
 * from *@pifname.  The other fields of *@hdr are unchanged. The @pifname is
 * updated to point at the first char past the port name.
 *
 * Returns 0 on success.  In case of error, -1 is returned with errno set to
 * EINVAL, @pifname is unchanged, *@hdr is also unchanged, and an error message
 * is sent through @ctx->error().
 */
int nmreq_header_decode(const char **ppspec, struct nmreq_header *hdr,
                struct nmctx *ctx);

/* nmreq_regiter_decode - initialize an nmreq_register
 * @pmode:      (in/out) pointer to a pointer to an opening mode
 * @reg:        pointer to the nmreq_register to be initialized
 * @ctx:        pointer to the nmctx to use (for errors)
 *
 * This function fills the nr_mode, nr_ringid, nr_flags and nr_mem_id fields of
 * the structure pointed by @reg, according to the opening mode specified by
 * *@pmode. The other fields of *@reg are unchanged.  The @pmode is updated to
 * point at the first char past the opening mode.
 *
 * If a '@' is encountered followed by something which is not a number, parsing
 * stops (without error) and @pmode is left pointing at the '@' char. The
 * nr_mode, nr_ringid and nr_flags fields are still updated, but nr_mem_id is
 * not touched and the interpretation of the '@' field is left to the caller.
 *
 * Returns 0 on success.  In case of error, -1 is returned with errno set to
 * EINVAL, @pmode is unchanged, *@reg is also unchanged, and an error message
 * is sent through @ctx->error().
 */
int nmreq_register_decode(const char **pmode, struct nmreq_register *reg,
                struct nmctx *ctx);

/* nmreq_options_decode - parse the "options" part of the portspec
 * @opt:        pointer to the option list
 * @parsers:    list of option parsers
 * @token:      token to pass to each parser
 * @ctx:        pointer to the nmctx to use (for errors and malloc/free)
 *
 * This function parses each option in @opt. Each option is matched (based on
 * the "option" prefix) to a corresponding parser in @parsers. The function
 * checks that the syntax is appropriate for the parser and it assigns all the
 * keys mentioned in the option. It then passes control to the parser, to
 * interpret the keys values.
 *
 * Returns 0 on success. In case of error, -1 is returned, errno is set to an
 * error value and a message is sent to @ctx->error(). The effects of partially
 * interpreted options may not be undone.
 */
struct nmreq_opt_parser;
int nmreq_options_decode(const char *opt, struct nmreq_opt_parser *parsers,
                void *token, struct nmctx *ctx);

struct nmreq_parse_ctx;
/* type of the option-parsers callbacks */
typedef int (*nmreq_opt_parser_cb)(struct nmreq_parse_ctx *);

#define NMREQ_OPT_MAXKEYS 16    /* max nr of recognized keys per option */

/* struct nmreq_opt_key - describes an option key */
struct nmreq_opt_key {
        const char *key;        /* the key name */
        int id;                 /* its position in the parse context */
        unsigned int flags;
#define NMREQ_OPTK_ALLOWEMPTY   (1U << 0) /* =value may be omitted */
#define NMREQ_OPTK_MUSTSET      (1U << 1) /* the key is mandatory */
#define NMREQ_OPTK_DEFAULT      (1U << 2) /* this is the default key */
};

/* struct nmreq_opt_parser - describes an option parser */
struct nmreq_opt_parser {
        const char *prefix;     /* matches one option prefix */
        nmreq_opt_parser_cb parse;      /* the parse callback */
        int default_key;        /* which option is the default if the
                                   parser is multi-key (-1 if none) */
        int nr_keys;
        unsigned int flags;
#define NMREQ_OPTF_DISABLED     (1U << 0)
#define NMREQ_OPTF_ALLOWEMPTY   (1U << 1)       /* =value can be omitted */

        struct nmreq_opt_parser *next;  /* list of options */

        /* recognized keys */
        struct nmreq_opt_key keys[NMREQ_OPT_MAXKEYS];
} __attribute__((aligned(16)));

/* struct nmreq_parse_ctx - the parse context received by the parse callback */
struct nmreq_parse_ctx {
        struct nmctx *ctx;      /* the nmctx for errors and malloc/free */
        void *token;            /* the token passed to nmreq_options_parse */

        /* the value (i.e., the part after the = sign) of each recognized key
         * is assigned to the corresponding entry in this array, based on the
         * key id. Unassigned keys are left at NULL.
         */
        const char *keys[NMREQ_OPT_MAXKEYS];
};

/* nmreq_get_mem_id - get the mem_id of the given port
 * @portname    pointer to a pointer to the portname
 * @ctx         pointer to the nmctx to use (for errors)
 *
 * *@portname must point to a substem:vpname porname, possibly followed by
 * something else.
 *
 * If successful, returns the mem_id of *@portname and moves @portname past the
 * subsystem:vpname part of the input. In case of error it returns -1, sets
 * errno to an error value and sends an error message to ctx->error().
 */
int32_t nmreq_get_mem_id(const char **portname, struct nmctx *ctx);

/* option list manipulation */
void nmreq_push_option(struct nmreq_header *, struct nmreq_option *);
void nmreq_remove_option(struct nmreq_header *, struct nmreq_option *);
struct nmreq_option *nmreq_find_option(struct nmreq_header *, uint32_t);
void nmreq_free_options(struct nmreq_header *);
const char* nmreq_option_name(uint32_t);
#define nmreq_foreach_option(h_, o_) \
        for ((o_) = (struct nmreq_option *)((uintptr_t)((h_)->nr_options));\
             (o_) != NULL;\
             (o_) = (struct nmreq_option *)((uintptr_t)((o_)->nro_next)))

/* nmctx manipulation */

/* the nmctx serves a few purposes:
 *
 * - maintain a list of all memory regions open by the program, so that two
 *   ports that are using the same region (as identified by the mem_id) will
 *   point to the same nmem_d instance.
 *
 * - allow the user to specify how to lock accesses to the above list, if
 *   needed (lock() callback)
 *
 * - allow the user to specify how error messages should be delivered (error()
 *   callback)
 *
 * - select the verbosity of the library (verbose field); if verbose==0, no
 *   errors are sent to the error() callback
 *
 * - allow the user to override the malloc/free functions used by the library
 *   (malloc() and free() callbacks)
 *
 */
typedef void  (*nmctx_error_cb)(struct nmctx *, const char *);
typedef void *(*nmctx_malloc_cb)(struct nmctx *,size_t);
typedef void  (*nmctx_free_cb)(struct nmctx *,void *);
typedef void  (*nmctx_lock_cb)(struct nmctx *, int);

struct nmctx {
        int verbose;
        nmctx_error_cb  error;
        nmctx_malloc_cb malloc;
        nmctx_free_cb   free;
        nmctx_lock_cb   lock;

        struct nmem_d  *mem_descs;
};

/* nmctx_get - obtain a pointer to the current default context */
struct nmctx *nmctx_get(void);

/* nmctx_set_default - change the default context
 * @ctx         pointer to the new context
 *
 * Returns a pointer to the previous default context.
 */
struct nmctx *nmctx_set_default(struct nmctx *ctx);

/* internal functions and data structures */

/* struct nmem_d - describes a memory region currently used */
struct nmem_d {
        uint16_t mem_id;        /* the region netmap identifier */
        int refcount;           /* how many nmport_d's point here */
        void *mem;              /* memory region base address */
        size_t size;            /* memory region size */
        int is_extmem;          /* was it obtained via extmem? */

        /* pointers for the circular list implementation.
         * The list head is the mem_descs filed in the nmctx
         */
        struct nmem_d *next;
        struct nmem_d *prev;
};

/* a trick to force the inclusion of libpthread only if requested. If
 * LIBNETMAP_NOTHREADSAFE is defined, no pthread symbol is imported.
 *
 * There is no need to actually call this function: the ((used)) attribute is
 * sufficient to include it in the image.
 */
static  __attribute__((used)) void libnetmap_init(void)
{
#ifndef LIBNETMAP_NOTHREADSAFE
        extern int nmctx_threadsafe;
        /* dummy assignment to link-in the nmctx-pthread.o object.  The proper
         * inizialization is performed only once in the library constructor
         * defined there.
         */
        nmctx_threadsafe = 1;
#endif /* LIBNETMAP_NOTHREADSAFE */
}

/* nmctx_set_threadsafe - install a threadsafe default context
 *
 * called by the constructor in nmctx-pthread.o to initialize a lock and install
 * the lock() callback in the default context.
 */
void nmctx_set_threadsafe(void);

/* nmctx_ferror - format and send an error message */
void nmctx_ferror(struct nmctx *, const char *, ...);
/* nmctx_malloc - allocate memory */
void *nmctx_malloc(struct nmctx *, size_t);
/* nmctx_free - free memory allocated via nmctx_malloc */
void nmctx_free(struct nmctx *, void *);
/* nmctx_lock - lock the list of nmem_d */
void nmctx_lock(struct nmctx *);
/* nmctx_unlock - unlock the list of nmem_d */
void nmctx_unlock(struct nmctx *);

#endif /* LIBNETMAP_H_ */