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Code Issues Releases Wiki Activity

netlink-socket: Make caller provide message receive buffers.

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Typically an nl_sock client can stack-allocate the buffer for receiving
a Netlink message, which provides a performance boost.

Signed-off-by: Ben Pfaff <blp@nicira.com>
This commit is contained in:
Ben Pfaff
2012-04-09 15:35:29 -07:00
parent 8843668ae5
commit 72d32ac0b3
6 changed files with 210 additions and 172 deletions
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20
lib/netlink-socket.h
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
* Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -35,8 +35,8 @@
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include "ofpbuf.h"
struct ofpbuf;
struct nl_sock;
#ifndef HAVE_NETLINK
@@ -52,9 +52,9 @@ int nl_sock_join_mcgroup(struct nl_sock *, unsigned int multicast_group);
int nl_sock_leave_mcgroup(struct nl_sock *, unsigned int multicast_group);
int nl_sock_send(struct nl_sock *, const struct ofpbuf *, bool wait);
int nl_sock_recv(struct nl_sock *, struct ofpbuf **, bool wait);
int nl_sock_recv(struct nl_sock *, struct ofpbuf *, bool wait);
int nl_sock_transact(struct nl_sock *, const struct ofpbuf *request,
struct ofpbuf **reply);
struct ofpbuf **replyp);
int nl_sock_drain(struct nl_sock *);
@@ -68,8 +68,14 @@ struct nl_transaction {
/* Filled in by client. */
struct ofpbuf *request; /* Request to send. */
/* Filled in by nl_sock_transact_batch(). */
struct ofpbuf *reply; /* Reply (NULL if reply was an error code). */
/* The client must initialize 'reply' to one of:
*
* - NULL, if it does not care to examine the reply.
*
* - Otherwise, to an ofpbuf with a memory allocation of at least
* NLMSG_HDRLEN bytes.
*/
struct ofpbuf *reply; /* Reply (empty if reply was an error code). */
int error; /* Positive errno value, 0 if no error. */
};
@@ -80,7 +86,7 @@ void nl_sock_transact_multiple(struct nl_sock *,
struct nl_dump {
struct nl_sock *sock; /* Socket being dumped. */
uint32_t seq; /* Expected nlmsg_seq for replies. */
struct ofpbuf *buffer; /* Receive buffer currently being iterated. */
struct ofpbuf buffer; /* Receive buffer currently being iterated. */
int status; /* 0=OK, EOF=done, or positive errno value. */
};