mirror of https://github.com/schoebel/mars
1324 lines
34 KiB
C
1324 lines
34 KiB
C
/*
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* MARS Long Distance Replication Software
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*
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* This file is part of MARS project: http://schoebel.github.io/mars/
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*
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* Copyright (C) 2010-2014 Thomas Schoebel-Theuer
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* Copyright (C) 2011-2014 1&1 Internet AG
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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//#define BRICK_DEBUGGING
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//#define MARS_DEBUGGING
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//#define IO_DEBUGGING
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//#define LOWLEVEL_DEBUGGING
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#ifdef LOWLEVEL_DEBUGGING
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#define MARS_LOW MARS_IO
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#else
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#define MARS_LOW(args...) /*empty*/
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#endif
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/moduleparam.h>
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#include "mars.h"
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#include "mars_net.h"
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#undef USE_SENDPAGE // FIXME: does not work, leads to data corruption (probably due to races with asynchrous sending)
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////////////////////////////////////////////////////////////////////
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// provisionary version detection
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#ifndef TCP_MAX_REORDERING
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#define __HAS_IOV_ITER
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#endif
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#ifdef sk_net_refcnt
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/* see eeb1bd5c40edb0e2fd925c8535e2fdebdbc5cef2 */
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#define __HAS_STRUCT_NET
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#endif
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////////////////////////////////////////////////////////////////////
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#define USE_BUFFERING
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/* Low-level network traffic
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*/
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int mars_net_default_port = CONFIG_MARS_DEFAULT_PORT;
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EXPORT_SYMBOL_GPL(mars_net_default_port);
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module_param_named(mars_port, mars_net_default_port, int, 0);
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/* TODO: allow binding to specific source addresses instead of catch-all.
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* TODO: make all the socket options configurable.
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* TODO: implement signal handling.
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* TODO: add authentication.
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* TODO: add compression / encryption.
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*/
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struct mars_tcp_params default_tcp_params = {
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.ip_tos = IPTOS_LOWDELAY,
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.tcp_window_size = 8 * 1024 * 1024, // for long distance replications
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.tcp_nodelay = 0,
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.tcp_timeout = 2,
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.tcp_keepcnt = 3,
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.tcp_keepintvl = 3, // keepalive ping time
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.tcp_keepidle = 4,
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};
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EXPORT_SYMBOL(default_tcp_params);
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static
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void __setsockopt(struct socket *sock, int level, int optname, char *optval, int optsize)
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{
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int status = kernel_setsockopt(sock, level, optname, optval, optsize);
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if (status < 0) {
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MARS_WRN("cannot set %d socket option %d to value %d, status = %d\n",
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level, optname, *(int*)optval, status);
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}
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}
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#define _setsockopt(sock,level,optname,val) __setsockopt(sock, level, optname, (char*)&(val), sizeof(val))
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int mars_create_sockaddr(struct sockaddr_storage *addr, const char *spec)
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{
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struct sockaddr_in *sockaddr = (void*)addr;
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const char *new_spec;
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const char *tmp_spec;
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int status = 0;
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memset(addr, 0, sizeof(*addr));
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sockaddr->sin_family = AF_INET;
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sockaddr->sin_port = htons(mars_net_default_port);
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/* Try to translate hostnames to IPs if possible.
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*/
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if (mars_translate_hostname) {
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new_spec = mars_translate_hostname(spec);
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} else {
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new_spec = brick_strdup(spec);
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}
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tmp_spec = new_spec;
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/* This is PROVISIONARY!
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* TODO: add IPV6 syntax and many more features :)
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*/
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if (!*tmp_spec)
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goto done;
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if (*tmp_spec != ':') {
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unsigned char u0 = 0, u1 = 0, u2 = 0, u3 = 0;
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status = sscanf(tmp_spec, "%hhu.%hhu.%hhu.%hhu", &u0, &u1, &u2, &u3);
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if (status != 4) {
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MARS_ERR("invalid sockaddr IP syntax '%s', status = %d\n", tmp_spec, status);
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status = -EINVAL;
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goto done;
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}
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MARS_DBG("decoded IP = %u.%u.%u.%u\n", u0, u1, u2, u3);
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sockaddr->sin_addr.s_addr = (__be32)u0 | (__be32)u1 << 8 | (__be32)u2 << 16 | (__be32)u3 << 24;
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}
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// deocde port number (when present)
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tmp_spec = spec;
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while (*tmp_spec && *tmp_spec++ != ':')
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/*empty*/;
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if (*tmp_spec) {
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int port = 0;
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status = sscanf(tmp_spec, "%d", &port);
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if (status != 1) {
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MARS_ERR("invalid sockaddr PORT syntax '%s', status = %d\n", tmp_spec, status);
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status = -EINVAL;
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goto done;
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}
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MARS_DBG("decoded PORT = %d\n", port);
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sockaddr->sin_port = htons(port);
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}
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status = 0;
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done:
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brick_string_free(new_spec);
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return status;
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}
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EXPORT_SYMBOL_GPL(mars_create_sockaddr);
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static int current_debug_nr = 0; // no locking, just for debugging
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static
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void _set_socketopts(struct socket *sock, struct mars_tcp_params *params)
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{
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struct timeval t = {
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.tv_sec = params->tcp_timeout,
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};
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int x_true = 1;
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/* TODO: improve this by a table-driven approach
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*/
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sock->sk->sk_rcvtimeo = sock->sk->sk_sndtimeo = params->tcp_timeout * HZ;
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sock->sk->sk_reuse = 1;
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_setsockopt(sock, SOL_SOCKET, SO_SNDBUFFORCE, params->tcp_window_size);
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_setsockopt(sock, SOL_SOCKET, SO_RCVBUFFORCE, params->tcp_window_size);
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_setsockopt(sock, SOL_IP, IP_TOS, params->ip_tos);
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_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, params->tcp_nodelay);
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_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, x_true);
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_setsockopt(sock, IPPROTO_TCP, TCP_KEEPCNT, params->tcp_keepcnt);
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_setsockopt(sock, IPPROTO_TCP, TCP_KEEPINTVL, params->tcp_keepintvl);
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_setsockopt(sock, IPPROTO_TCP, TCP_KEEPIDLE, params->tcp_keepidle);
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_setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, t);
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_setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, t);
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if (sock->file) { // switch back to blocking mode
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sock->file->f_flags &= ~O_NONBLOCK;
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}
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}
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int mars_create_socket(struct mars_socket *msock,
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struct sockaddr_storage *addr,
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struct mars_tcp_params *params,
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bool is_server)
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{
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struct socket *sock;
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struct sockaddr *sockaddr = (void*)addr;
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int status = -EEXIST;
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if (!mars_net_is_alive)
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goto final;
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if (unlikely(atomic_read(&msock->s_count))) {
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MARS_ERR("#%d socket already in use\n", msock->s_debug_nr);
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goto final;
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}
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if (unlikely(msock->s_socket)) {
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MARS_ERR("#%d socket already open\n", msock->s_debug_nr);
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goto final;
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}
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atomic_set(&msock->s_count, 1);
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#ifdef __HAS_STRUCT_NET
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status = sock_create_kern(&init_net, AF_INET, SOCK_STREAM, IPPROTO_TCP, &msock->s_socket);
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#else
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status = sock_create_kern(AF_INET, SOCK_STREAM, IPPROTO_TCP, &msock->s_socket);
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#endif
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if (unlikely(status < 0 || !msock->s_socket)) {
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msock->s_socket = NULL;
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MARS_WRN("cannot create socket, status = %d\n", status);
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goto final;
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}
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msock->s_debug_nr = ++current_debug_nr;
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sock = msock->s_socket;
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CHECK_PTR(sock, done);
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msock->s_alive = true;
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msock->s_connected = false;
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_set_socketopts(sock, params);
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if (is_server) {
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status = kernel_bind(sock, sockaddr, sizeof(*sockaddr));
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if (unlikely(status < 0)) {
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MARS_WRN("#%d bind failed, status = %d\n", msock->s_debug_nr, status);
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goto done;
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}
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status = kernel_listen(sock, 16);
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if (status < 0) {
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MARS_WRN("#%d listen failed, status = %d\n", msock->s_debug_nr, status);
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}
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} else {
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status = kernel_connect(sock, sockaddr, sizeof(*sockaddr), 0);
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/* Treat non-blocking connects as successful.
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* Any potential errors will show up later during traffic.
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*/
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if (status == -EINPROGRESS) {
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MARS_DBG("#%d connect in progress\n", msock->s_debug_nr);
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status = 0;
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}
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if (status < 0) {
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MARS_DBG("#%d connect failed, status = %d\n", msock->s_debug_nr, status);
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}
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}
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done:
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if (status < 0) {
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mars_put_socket(msock);
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} else {
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MARS_DBG("successfully created socket #%d\n", msock->s_debug_nr);
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}
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final:
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return status;
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}
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EXPORT_SYMBOL_GPL(mars_create_socket);
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int mars_accept_socket(struct mars_socket *new_msock,
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struct mars_socket *old_msock,
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struct mars_tcp_params *params)
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{
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int status = -ENOENT;
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struct socket *new_socket = NULL;
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bool ok;
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if (!mars_net_is_alive)
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goto final;
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ok = mars_get_socket(old_msock);
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if (likely(ok)) {
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struct socket *sock = old_msock->s_socket;
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if (unlikely(!sock)) {
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goto err;
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}
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status = kernel_accept(sock, &new_socket, O_NONBLOCK);
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if (unlikely(status < 0)) {
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goto err;
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}
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if (unlikely(!new_socket)) {
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status = -EBADF;
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goto err;
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}
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MARS_IO("old#%d status = %d file = %p flags = 0x%x\n", old_msock->s_debug_nr, status, new_socket->file, new_socket->file ? new_socket->file->f_flags : 0);
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_set_socketopts(new_socket, params);
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memset(new_msock, 0, sizeof(struct mars_socket));
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new_msock->s_socket = new_socket;
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atomic_set(&new_msock->s_count, 1);
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new_msock->s_alive = true;
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new_msock->s_debug_nr = ++current_debug_nr;
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MARS_DBG("#%d successfully accepted socket #%d\n", old_msock->s_debug_nr, new_msock->s_debug_nr);
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status = 0;
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err:
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mars_put_socket(old_msock);
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}
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final:
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return status;
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}
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EXPORT_SYMBOL_GPL(mars_accept_socket);
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bool mars_get_socket(struct mars_socket *msock)
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{
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MARS_LOW("#%d get socket %p s_count=%d\n", msock->s_debug_nr, msock->s_socket, atomic_read(&msock->s_count));
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if (unlikely(atomic_read(&msock->s_count) <= 0)) {
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MARS_ERR("#%d bad nesting on msock = %p\n", msock->s_debug_nr, msock);
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return false;
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}
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atomic_inc(&msock->s_count);
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if (unlikely(!msock->s_socket || !msock->s_alive)) {
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mars_put_socket(msock);
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return false;
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}
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MARS_LOW("#%d got socket\n", msock->s_debug_nr);
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return true;
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}
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EXPORT_SYMBOL_GPL(mars_get_socket);
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void mars_put_socket(struct mars_socket *msock)
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{
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MARS_LOW("#%d put socket %p s_count=%d\n", msock->s_debug_nr, msock->s_socket, atomic_read(&msock->s_count));
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if (unlikely(atomic_read(&msock->s_count) <= 0)) {
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MARS_ERR("#%d bad nesting on msock = %p sock = %p\n", msock->s_debug_nr, msock, msock->s_socket);
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} else if (atomic_dec_and_test(&msock->s_count)) {
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struct socket *sock = msock->s_socket;
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int i;
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MARS_DBG("#%d closing socket %p\n", msock->s_debug_nr, sock);
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if (likely(sock && cmpxchg(&msock->s_alive, true, false))) {
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kernel_sock_shutdown(sock, SHUT_RDWR);
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}
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if (likely(sock && !msock->s_alive)) {
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MARS_DBG("#%d releasing socket %p\n", msock->s_debug_nr, sock);
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sock_release(sock);
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}
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for (i = 0; i < MAX_DESC_CACHE; i++) {
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if (msock->s_desc_send[i])
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brick_block_free(msock->s_desc_send[i], PAGE_SIZE);
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if (msock->s_desc_recv[i])
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brick_block_free(msock->s_desc_recv[i], PAGE_SIZE);
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}
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brick_block_free(msock->s_buffer, PAGE_SIZE);
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memset(msock, 0, sizeof(struct mars_socket));
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}
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}
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EXPORT_SYMBOL_GPL(mars_put_socket);
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void mars_shutdown_socket(struct mars_socket *msock)
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{
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MARS_IO("#%d shutdown socket %p s_count=%d\n", msock->s_debug_nr, msock->s_socket, atomic_read(&msock->s_count));
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if (msock->s_socket) {
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bool ok = mars_get_socket(msock);
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if (likely(ok)) {
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struct socket *sock = msock->s_socket;
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if (likely(sock && cmpxchg(&msock->s_alive, true, false))) {
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MARS_DBG("#%d shutdown socket %p\n", msock->s_debug_nr, sock);
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msock->s_connected = false;
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kernel_sock_shutdown(sock, SHUT_RDWR);
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}
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mars_put_socket(msock);
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}
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}
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}
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EXPORT_SYMBOL_GPL(mars_shutdown_socket);
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bool mars_socket_is_alive(struct mars_socket *msock)
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{
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bool ok;
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bool res = false;
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if (!mars_net_is_alive)
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goto done;
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if (!msock->s_socket || !msock->s_alive)
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goto done;
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if (unlikely(atomic_read(&msock->s_count) <= 0)) {
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MARS_ERR("#%d bad nesting on msock = %p sock = %p\n", msock->s_debug_nr, msock, msock->s_socket);
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goto done;
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}
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ok = mars_get_socket(msock);
|
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if (likely(ok)) {
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struct socket *sock = msock->s_socket;
|
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if (sock->state == SS_CONNECTED) {
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msock->s_connected = true;
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} else if (msock->s_connected) {
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MARS_DBG("#%d remote side hangup %p sock = %p\n", msock->s_debug_nr, msock, msock->s_socket);
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goto done;
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}
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mars_put_socket(msock);
|
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}
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res = true;
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done:
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MARS_LOW("#%d %p s_count = %d\n", msock->s_debug_nr, msock->s_socket, atomic_read(&msock->s_count));
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return res;
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}
|
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EXPORT_SYMBOL_GPL(mars_socket_is_alive);
|
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|
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long mars_socket_send_space_available(struct mars_socket *msock)
|
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{
|
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struct socket *raw_sock = msock->s_socket;
|
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long res = 0;
|
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if (!msock->s_alive || !raw_sock || !raw_sock->sk)
|
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goto done;
|
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if (unlikely(atomic_read(&msock->s_count) <= 0)) {
|
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MARS_ERR("#%d bad nesting on msock = %p sock = %p\n", msock->s_debug_nr, msock, msock->s_socket);
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goto done;
|
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}
|
|
|
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res = raw_sock->sk->sk_sndbuf - raw_sock->sk->sk_wmem_queued;
|
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if (res < 0)
|
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res = 0;
|
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res += msock->s_pos;
|
|
|
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done:
|
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return res;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mars_socket_send_space_available);
|
|
|
|
static
|
|
int _mars_send_raw(struct mars_socket *msock, const void *buf, int len)
|
|
{
|
|
int sleeptime = 1000 / HZ;
|
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int backoff = 0;
|
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int sent = 0;
|
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int status = 0;
|
|
|
|
msock->s_send_cnt = 0;
|
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while (len > 0) {
|
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int this_len = len;
|
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struct socket *sock = msock->s_socket;
|
|
|
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if (unlikely(!sock || !mars_net_is_alive || brick_thread_should_stop())) {
|
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MARS_WRN("interrupting, sent = %d\n", sent);
|
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status = -EIDRM;
|
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break;
|
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}
|
|
|
|
#ifdef USE_SENDPAGE // FIXME: does not work, leads to data corruption (probably due to races with asynchrous sending)
|
|
{
|
|
int page_offset = 0;
|
|
struct page *page;
|
|
int flags = MSG_NOSIGNAL;
|
|
page = brick_iomap(buf, &page_offset, &this_len);
|
|
if (unlikely(!page)) {
|
|
MARS_ERR("cannot iomap() kernel address %p\n", buf);
|
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status = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (this_len < len)
|
|
flags |= MSG_MORE;
|
|
|
|
status = kernel_sendpage(sock, page, page_offset, this_len, flags);
|
|
if (status > 0 && status != this_len) {
|
|
MARS_WRN("#%d status = %d this_len = %d\n", msock->s_debug_nr, status, this_len);
|
|
}
|
|
}
|
|
#else // spare code, activate in case of problems with sendpage()
|
|
{
|
|
struct kvec iov = {
|
|
.iov_base = (void*)buf,
|
|
.iov_len = this_len,
|
|
};
|
|
struct msghdr msg = {
|
|
#ifndef __HAS_IOV_ITER
|
|
.msg_iov = (struct iovec*)&iov,
|
|
#endif
|
|
.msg_flags = 0 | MSG_NOSIGNAL,
|
|
};
|
|
status = kernel_sendmsg(sock, &msg, &iov, 1, this_len);
|
|
}
|
|
#endif
|
|
|
|
if (status == -EAGAIN) {
|
|
if (msock->s_send_abort > 0 && ++msock->s_send_cnt >= msock->s_send_abort) {
|
|
MARS_WRN("#%d reached send abort %d\n", msock->s_debug_nr, msock->s_send_abort);
|
|
status = -EINTR;
|
|
break;
|
|
}
|
|
brick_msleep(sleeptime);
|
|
// quadratic backoff
|
|
if (sleeptime < 50) {
|
|
sleeptime += backoff;
|
|
backoff += 1000 / HZ;
|
|
}
|
|
continue;
|
|
}
|
|
msock->s_send_cnt = 0;
|
|
if (unlikely(status == -EINTR)) { // ignore it
|
|
flush_signals(current);
|
|
MARS_IO("#%d got signal\n", msock->s_debug_nr);
|
|
brick_msleep(sleeptime);
|
|
continue;
|
|
}
|
|
if (unlikely(!status)) {
|
|
MARS_WRN("#%d EOF from socket upon send_page()\n", msock->s_debug_nr);
|
|
status = -ECOMM;
|
|
break;
|
|
}
|
|
if (unlikely(status < 0)) {
|
|
MARS_WRN("#%d bad socket sendmsg, len=%d, this_len=%d, sent=%d, status = %d\n", msock->s_debug_nr, len, this_len, sent, status);
|
|
break;
|
|
}
|
|
|
|
len -= status;
|
|
buf += status;
|
|
sent += status;
|
|
sleeptime = 1000 / HZ;
|
|
backoff = 0;
|
|
}
|
|
|
|
if (status >= 0)
|
|
status = sent;
|
|
|
|
return status;
|
|
}
|
|
|
|
int mars_send_raw(struct mars_socket *msock, const void *buf, int len, bool cork)
|
|
{
|
|
#ifdef USE_BUFFERING
|
|
int sent = 0;
|
|
int rest = len;
|
|
#endif
|
|
int status = -EINVAL;
|
|
|
|
if (!mars_get_socket(msock))
|
|
goto final;
|
|
|
|
MARS_IO("#%d cork=%d sending len=%d bytes\n", msock->s_debug_nr, cork, len);
|
|
|
|
#ifdef USE_BUFFERING
|
|
restart:
|
|
while (!msock->s_buffer) {
|
|
msock->s_pos = 0;
|
|
msock->s_buffer = brick_block_alloc(0, PAGE_SIZE);
|
|
if (unlikely(!msock->s_buffer))
|
|
brick_msleep(100);
|
|
}
|
|
|
|
if (msock->s_pos + rest < PAGE_SIZE) {
|
|
if (buf) {
|
|
memcpy(msock->s_buffer + msock->s_pos, buf, rest);
|
|
msock->s_pos += rest;
|
|
sent += rest;
|
|
}
|
|
rest = 0;
|
|
status = sent;
|
|
if (cork)
|
|
goto done;
|
|
}
|
|
|
|
if (msock->s_pos > 0) {
|
|
status = _mars_send_raw(msock, msock->s_buffer, msock->s_pos);
|
|
MARS_IO("#%d buffer send %d bytes status=%d\n", msock->s_debug_nr, msock->s_pos, status);
|
|
if (status < 0)
|
|
goto done;
|
|
|
|
brick_block_free(msock->s_buffer, PAGE_SIZE);
|
|
msock->s_buffer = NULL;
|
|
msock->s_pos = 0;
|
|
}
|
|
|
|
if (rest >= PAGE_SIZE) {
|
|
status = _mars_send_raw(msock, buf, rest);
|
|
MARS_IO("#%d bulk send %d bytes status=%d\n", msock->s_debug_nr, rest, status);
|
|
goto done;
|
|
} else if (rest > 0) {
|
|
goto restart;
|
|
}
|
|
status = sent;
|
|
|
|
done:
|
|
#else
|
|
status = _mars_send_raw(msock, buf, len);
|
|
#endif
|
|
if (status < 0 && msock->s_shutdown_on_err)
|
|
mars_shutdown_socket(msock);
|
|
|
|
mars_put_socket(msock);
|
|
|
|
final:
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mars_send_raw);
|
|
|
|
/**
|
|
* mars_recv_raw() - Get [min,max] number of bytes
|
|
* @msock: socket to read from
|
|
* @buf: buffer to put the data in
|
|
* @minlen: minimum number of bytes to read
|
|
* @maxlen: maximum number of bytes to read
|
|
*
|
|
* Returns a negative error code or a number between [@minlen,@maxlen].
|
|
* Short reads are mapped to an error.
|
|
*
|
|
* Hint: by setting @minlen to 1, you can read any number up to @maxlen.
|
|
* However, the most important use case is @minlen == @maxlen.
|
|
*
|
|
* Note: buf may be NULL. In this case, the data is simply consumed,
|
|
* like /dev/null
|
|
*/
|
|
int mars_recv_raw(struct mars_socket *msock, void *buf, int minlen, int maxlen)
|
|
{
|
|
void *dummy = NULL;
|
|
int sleeptime = 1000 / HZ;
|
|
int backoff = 0;
|
|
int status = -EIDRM;
|
|
int done = 0;
|
|
|
|
if (!buf) {
|
|
buf = dummy = brick_block_alloc(0, maxlen);
|
|
}
|
|
if (!buf) {
|
|
MARS_WRN("#%d bad receive buffer\n", msock->s_debug_nr);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!mars_get_socket(msock))
|
|
goto final;
|
|
|
|
if (minlen < maxlen) {
|
|
struct socket *sock = msock->s_socket;
|
|
if (sock && sock->file) {
|
|
/* Use nonblocking reads to consume as much data
|
|
* as possible
|
|
*/
|
|
sock->file->f_flags |= O_NONBLOCK;
|
|
}
|
|
}
|
|
|
|
MARS_IO("#%d receiving len=%d/%d bytes\n", msock->s_debug_nr, minlen, maxlen);
|
|
|
|
msock->s_recv_cnt = 0;
|
|
while (done < minlen || (!minlen && !done)) {
|
|
struct kvec iov = {
|
|
.iov_base = buf + done,
|
|
.iov_len = maxlen - done,
|
|
};
|
|
struct msghdr msg = {
|
|
#ifndef __HAS_IOV_ITER
|
|
.msg_iovlen = 1,
|
|
.msg_iov = (struct iovec*)&iov,
|
|
#endif
|
|
.msg_flags = MSG_NOSIGNAL,
|
|
};
|
|
struct socket *sock = msock->s_socket;
|
|
|
|
if (unlikely(!sock)) {
|
|
MARS_WRN("#%d socket has disappeared\n", msock->s_debug_nr);
|
|
status = -EIDRM;
|
|
goto err;
|
|
}
|
|
|
|
if (!mars_net_is_alive || brick_thread_should_stop()) {
|
|
MARS_WRN("#%d interrupting, done = %d\n", msock->s_debug_nr, done);
|
|
status = -EIDRM;
|
|
goto err;
|
|
}
|
|
|
|
MARS_LOW("#%d done %d, fetching %d bytes\n", msock->s_debug_nr, done, maxlen-done);
|
|
|
|
status = kernel_recvmsg(sock, &msg, &iov, 1, maxlen-done, msg.msg_flags);
|
|
|
|
MARS_LOW("#%d status = %d\n", msock->s_debug_nr, status);
|
|
|
|
if (!mars_net_is_alive || brick_thread_should_stop()) {
|
|
MARS_WRN("#%d interrupting, done = %d\n", msock->s_debug_nr, done);
|
|
status = -EIDRM;
|
|
goto err;
|
|
}
|
|
|
|
if (status == -EAGAIN) {
|
|
if (msock->s_recv_abort > 0 && ++msock->s_recv_cnt >= msock->s_recv_abort) {
|
|
MARS_WRN("#%d reached recv abort %d\n", msock->s_debug_nr, msock->s_recv_abort);
|
|
status = -EINTR;
|
|
goto err;
|
|
}
|
|
brick_msleep(sleeptime);
|
|
if (minlen <= 0)
|
|
break;
|
|
// quadratic backoff
|
|
if (sleeptime < 50) {
|
|
sleeptime += backoff;
|
|
backoff += 1000 / HZ;
|
|
}
|
|
continue;
|
|
}
|
|
msock->s_recv_cnt = 0;
|
|
if (!status) { // EOF
|
|
MARS_WRN("#%d got EOF from socket (done=%d, req_size=%d)\n", msock->s_debug_nr, done, maxlen - done);
|
|
status = -EPIPE;
|
|
goto err;
|
|
}
|
|
if (status < 0) {
|
|
MARS_WRN("#%d bad recvmsg, status = %d\n", msock->s_debug_nr, status);
|
|
goto err;
|
|
}
|
|
done += status;
|
|
sleeptime = 1000 / HZ;
|
|
backoff = 0;
|
|
}
|
|
status = done;
|
|
|
|
MARS_IO("#%d got %d bytes\n", msock->s_debug_nr, done);
|
|
|
|
err:
|
|
if (status < 0 && msock->s_shutdown_on_err)
|
|
mars_shutdown_socket(msock);
|
|
mars_put_socket(msock);
|
|
final:
|
|
if (dummy)
|
|
brick_block_free(dummy, maxlen);
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mars_recv_raw);
|
|
|
|
///////////////////////////////////////////////////////////////////////
|
|
|
|
/* Mid-level field data exchange
|
|
*/
|
|
|
|
static
|
|
void dump_meta(const struct meta *meta)
|
|
{
|
|
int count = 0;
|
|
for (; meta->field_name != NULL; meta++) {
|
|
MARS_ERR("%2d %4d %4d %p '%s'\n",
|
|
meta->field_type,
|
|
meta->field_size,
|
|
meta->field_offset,
|
|
meta->field_ref,
|
|
meta->field_name);
|
|
count++;
|
|
}
|
|
MARS_ERR("-------- %d fields.\n", count);
|
|
}
|
|
|
|
static
|
|
int _add_fields(struct mars_desc_item *mi, const struct meta *meta, int offset, const char *prefix, int maxlen)
|
|
{
|
|
int count = 0;
|
|
for (; meta->field_name != NULL; meta++) {
|
|
const char *new_prefix;
|
|
int new_offset;
|
|
int len;
|
|
|
|
new_prefix = mi->field_name;
|
|
new_offset = offset + meta->field_offset;
|
|
|
|
MARS_IO("input field_name='%s' field_type=%d\n", meta->field_name, meta->field_type);
|
|
|
|
if (unlikely(maxlen < sizeof(struct mars_desc_item))) {
|
|
MARS_ERR("desc cache item overflow\n");
|
|
count = -1;
|
|
goto done;
|
|
}
|
|
|
|
len = scnprintf(mi->field_name, MAX_FIELD_LEN, "%s.%s", prefix, meta->field_name);
|
|
if (unlikely(len >= MAX_FIELD_LEN)) {
|
|
MARS_ERR("field len overflow on '%s.%s'\n", prefix, meta->field_name);
|
|
count = -1;
|
|
goto done;
|
|
}
|
|
mi->field_type = meta->field_type;
|
|
mi->field_size = meta->field_size;
|
|
mi->field_sender_offset = new_offset;
|
|
mi->field_recver_offset = -1;
|
|
|
|
MARS_IO("output field_name='%s' field_type=%d\n", mi->field_name, mi->field_type);
|
|
|
|
mi++;
|
|
maxlen -= sizeof(struct mars_desc_item);
|
|
count++;
|
|
|
|
if (meta->field_type == FIELD_SUB) {
|
|
int sub_count;
|
|
sub_count = _add_fields(mi, meta->field_ref, new_offset, new_prefix, maxlen);
|
|
if (sub_count < 0)
|
|
return sub_count;
|
|
|
|
mi += sub_count;
|
|
count += sub_count;
|
|
maxlen -= sub_count * sizeof(struct mars_desc_item);
|
|
}
|
|
}
|
|
done:
|
|
MARS_IO("count=%d\n", count);
|
|
return count;
|
|
}
|
|
|
|
static
|
|
struct mars_desc_cache *make_sender_cache(struct mars_socket *msock, const struct meta *meta, int *cache_index)
|
|
{
|
|
int orig_len = PAGE_SIZE;
|
|
int maxlen = orig_len;
|
|
struct mars_desc_cache *mc;
|
|
struct mars_desc_item *mi;
|
|
int i;
|
|
int status;
|
|
|
|
for (i = 0; i < MAX_DESC_CACHE; i++) {
|
|
mc = msock->s_desc_send[i];
|
|
if (!mc)
|
|
break;
|
|
if (mc->cache_sender_cookie == (u64)meta)
|
|
goto done;
|
|
}
|
|
|
|
MARS_IO("#%d meta=%p i=%d\n", msock->s_debug_nr, meta, i);
|
|
|
|
if (unlikely(i >= MAX_DESC_CACHE - 1)) {
|
|
MARS_ERR("#%d desc cache overflow\n", msock->s_debug_nr);
|
|
return NULL;
|
|
}
|
|
|
|
mc = brick_block_alloc(0, maxlen);
|
|
if (unlikely(!mc)) {
|
|
MARS_ERR("#%d desc cache alloc error\n", msock->s_debug_nr);
|
|
goto done;
|
|
}
|
|
|
|
memset(mc, 0, maxlen);
|
|
mc->cache_sender_cookie = (u64)meta;
|
|
|
|
maxlen -= sizeof(struct mars_desc_cache);
|
|
mi = (void*)(mc + 1);
|
|
|
|
status = _add_fields(mi, meta, 0, "", maxlen);
|
|
|
|
if (likely(status > 0)) {
|
|
mc->cache_items = status;
|
|
msock->s_desc_send[i] = mc;
|
|
*cache_index = i;
|
|
} else {
|
|
brick_block_free(mc, orig_len);
|
|
mc = NULL;
|
|
}
|
|
|
|
done:
|
|
return mc;
|
|
}
|
|
|
|
static
|
|
int _make_recver_cache(struct mars_desc_cache *mc, const struct meta *meta, int offset, const char *prefix)
|
|
{
|
|
char *tmp = brick_string_alloc(MAX_FIELD_LEN);
|
|
int count = 0;
|
|
int i;
|
|
|
|
for (; meta->field_name != NULL; meta++, count++) {
|
|
snprintf(tmp, MAX_FIELD_LEN, "%s.%s", prefix, meta->field_name);
|
|
for (i = 0; i < mc->cache_items; i++) {
|
|
struct mars_desc_item *mi = ((struct mars_desc_item*)(mc + 1)) + i;
|
|
if (meta->field_type == mi->field_type &&
|
|
!strcmp(tmp, mi->field_name)) {
|
|
mi->field_recver_offset = offset + meta->field_offset;
|
|
if (meta->field_type == FIELD_SUB) {
|
|
int sub_count = _make_recver_cache(mc, meta->field_ref, mi->field_recver_offset, tmp);
|
|
if (unlikely(sub_count <= 0)) {
|
|
count = 0;
|
|
goto done;
|
|
}
|
|
}
|
|
goto found;
|
|
}
|
|
}
|
|
if (unlikely(!count)) {
|
|
MARS_ERR("field '%s' is missing\n", meta->field_name);
|
|
goto done;
|
|
}
|
|
MARS_WRN("field %2d '%s' is missing\n", count, meta->field_name);
|
|
found:;
|
|
}
|
|
done:
|
|
brick_string_free(tmp);
|
|
return count;
|
|
}
|
|
|
|
static
|
|
int make_recver_cache(struct mars_desc_cache *mc, const struct meta *meta)
|
|
{
|
|
int count;
|
|
int i;
|
|
|
|
mc->cache_recver_cookie = (u64)meta;
|
|
count = _make_recver_cache(mc, meta, 0, "");
|
|
|
|
for (i = 0; i < mc->cache_items; i++) {
|
|
struct mars_desc_item *mi = ((struct mars_desc_item*)(mc + 1)) + i;
|
|
if (unlikely(mi->field_recver_offset < 0)) {
|
|
MARS_WRN("field '%s' is not transferred\n", mi->field_name);
|
|
}
|
|
}
|
|
return count;
|
|
}
|
|
|
|
static
|
|
int _desc_send_item(struct mars_socket *msock, const void *data, const struct mars_desc_cache *mc, int index, bool cork)
|
|
{
|
|
struct mars_desc_item *mi = ((struct mars_desc_item*)(mc + 1)) + index;
|
|
const void *item = data + mi->field_sender_offset;
|
|
int len = mi->field_size;
|
|
int status;
|
|
int res = -1;
|
|
|
|
MARS_IO("#%d cork=%d mc=%p field_name='%s' field_type=%d\n", msock->s_debug_nr, cork, mc, mi->field_name, mi->field_type);
|
|
|
|
switch (mi->field_type) {
|
|
case FIELD_REF:
|
|
MARS_ERR("NYI\n");
|
|
goto done;
|
|
case FIELD_SUB:
|
|
/* skip this */
|
|
res = 0;
|
|
break;
|
|
case FIELD_STRING:
|
|
item = *(void**)item;
|
|
len = 0;
|
|
if (item)
|
|
len = strlen(item) + 1;
|
|
|
|
status = mars_send_raw(msock, &len, sizeof(len), cork || len > 0);
|
|
if (unlikely(status < 0))
|
|
goto done;
|
|
/* fallthrough */
|
|
default:
|
|
if (likely(len > 0)) {
|
|
status = mars_send_raw(msock, item, len, cork);
|
|
if (unlikely(status < 0))
|
|
goto done;
|
|
}
|
|
res = len;
|
|
}
|
|
done:
|
|
return res;
|
|
}
|
|
|
|
static
|
|
int _desc_recv_item(struct mars_socket *msock, void *data, const struct mars_desc_cache *mc, int index, int line)
|
|
{
|
|
struct mars_desc_item *mi = ((struct mars_desc_item*)(mc + 1)) + index;
|
|
void *item = NULL;
|
|
int len = mi->field_size;
|
|
int status;
|
|
int res = -1;
|
|
|
|
if (likely(data && mi->field_recver_offset >= 0)) {
|
|
item = data + mi->field_recver_offset;
|
|
}
|
|
|
|
switch (mi->field_type) {
|
|
case FIELD_REF:
|
|
MARS_ERR("NYI\n");
|
|
goto done;
|
|
case FIELD_SUB:
|
|
/* skip this */
|
|
res = 0;
|
|
break;
|
|
case FIELD_STRING:
|
|
len = 0;
|
|
status = mars_recv_raw(msock, &len, sizeof(len), sizeof(len));
|
|
if (unlikely(status < 0))
|
|
goto done;
|
|
|
|
if (len > 0 && item) {
|
|
char *str = _brick_string_alloc(len, line);
|
|
if (unlikely(!str)) {
|
|
MARS_ERR("#%d string alloc error\n", msock->s_debug_nr);
|
|
goto done;
|
|
}
|
|
*(void**)item = str;
|
|
item = str;
|
|
}
|
|
|
|
/* fallthrough */
|
|
default:
|
|
if (likely(len > 0)) {
|
|
status = mars_recv_raw(msock, item, len, len);
|
|
if (unlikely(status < 0))
|
|
goto done;
|
|
}
|
|
res = len;
|
|
}
|
|
done:
|
|
return res;
|
|
}
|
|
|
|
#define MARS_DESC_MAGIC 0x73f0A2ec6148f48dll
|
|
|
|
struct mars_desc_header {
|
|
u64 h_magic;
|
|
u64 h_cookie;
|
|
s16 h_meta_len;
|
|
s16 h_index;
|
|
};
|
|
|
|
static inline
|
|
int _desc_send_struct(struct mars_socket *msock, int cache_index, const void *data, int h_meta_len, bool cork)
|
|
{
|
|
const struct mars_desc_cache *mc = msock->s_desc_send[cache_index];
|
|
struct mars_desc_header header = {
|
|
.h_magic = MARS_DESC_MAGIC,
|
|
.h_cookie = mc->cache_sender_cookie,
|
|
.h_meta_len = h_meta_len,
|
|
.h_index = data ? cache_index : -1,
|
|
};
|
|
int index;
|
|
int count = 0;
|
|
int status = 0;
|
|
|
|
MARS_IO("#%d cork=%d mc=%p h_meta_len=%d\n", msock->s_debug_nr, cork, mc, h_meta_len);
|
|
|
|
status = mars_send_raw(msock, &header, sizeof(header), cork || data);
|
|
if (unlikely(status < 0))
|
|
goto err;
|
|
|
|
if (unlikely(h_meta_len > 0)) {
|
|
status = mars_send_raw(msock, mc, h_meta_len, true);
|
|
MARS_IO("#%d sent mc=%p h_meta_len=%d status=%d\n", msock->s_debug_nr, mc, h_meta_len, status);
|
|
if (unlikely(status < 0))
|
|
goto err;
|
|
}
|
|
|
|
if (likely(data)) {
|
|
for (index = 0; index < mc->cache_items; index++) {
|
|
status = _desc_send_item(msock, data, mc, index, cork || index < mc->cache_items-1);
|
|
if (unlikely(status < 0))
|
|
goto err;
|
|
count++;
|
|
}
|
|
}
|
|
|
|
if (status >= 0)
|
|
status = count;
|
|
err:
|
|
return status;
|
|
}
|
|
|
|
static
|
|
int desc_send_struct(struct mars_socket *msock, const void *data, const struct meta *meta, bool cork)
|
|
{
|
|
struct mars_desc_cache *mc;
|
|
int i;
|
|
int h_meta_len = 0;
|
|
int status = -EINVAL;
|
|
|
|
for (i = 0; i < MAX_DESC_CACHE; i++) {
|
|
mc = msock->s_desc_send[i];
|
|
if (!mc)
|
|
break;
|
|
if (mc->cache_sender_cookie == (u64)meta)
|
|
goto found;
|
|
}
|
|
|
|
mc = make_sender_cache(msock, meta, &i);
|
|
if (unlikely(!mc))
|
|
goto done;
|
|
|
|
h_meta_len = mc->cache_items * sizeof(struct mars_desc_item) + sizeof(struct mars_desc_cache);
|
|
|
|
found:
|
|
status = _desc_send_struct(msock, i, data, h_meta_len, cork);
|
|
|
|
done:
|
|
return status;
|
|
}
|
|
|
|
static
|
|
int desc_recv_struct(struct mars_socket *msock, void *data, const struct meta *meta, int line)
|
|
{
|
|
struct mars_desc_header header = {};
|
|
struct mars_desc_cache *mc;
|
|
int cache_index;
|
|
int index;
|
|
int count = 0;
|
|
int status = 0;
|
|
|
|
status = mars_recv_raw(msock, &header, sizeof(header), sizeof(header));
|
|
if (unlikely(status < 0))
|
|
goto err;
|
|
|
|
if (unlikely(header.h_magic != MARS_DESC_MAGIC)) {
|
|
MARS_WRN("#%d called from line %d bad packet header magic = %llx\n", msock->s_debug_nr, line, header.h_magic);
|
|
status = -ENOMSG;
|
|
goto err;
|
|
}
|
|
|
|
cache_index = header.h_index;
|
|
if (cache_index < 0) { // EOR
|
|
goto done;
|
|
}
|
|
if (unlikely(cache_index >= MAX_DESC_CACHE - 1)) {
|
|
MARS_WRN("#%d called from line %d bad cache index %d\n", msock->s_debug_nr, line, cache_index);
|
|
status = -EBADF;
|
|
goto err;
|
|
}
|
|
|
|
mc = msock->s_desc_recv[cache_index];
|
|
if (unlikely(!mc)) {
|
|
if (unlikely(header.h_meta_len <= 0)) {
|
|
MARS_WRN("#%d called from line %d missing meta information\n", msock->s_debug_nr, line);
|
|
status = -ENOMSG;
|
|
goto err;
|
|
}
|
|
|
|
mc = _brick_block_alloc(0, PAGE_SIZE, line);
|
|
if (unlikely(!mc)) {
|
|
MARS_WRN("#%d called from line %d out of memory\n", msock->s_debug_nr, line);
|
|
status = -ENOMEM;
|
|
goto err;
|
|
}
|
|
|
|
status = mars_recv_raw(msock, mc, header.h_meta_len, header.h_meta_len);
|
|
MARS_IO("#%d got mc=%p h_meta_len=%d status=%d\n", msock->s_debug_nr, mc, header.h_meta_len, status);
|
|
if (unlikely(status < 0)) {
|
|
brick_block_free(mc, PAGE_SIZE);
|
|
goto err;
|
|
}
|
|
|
|
status = make_recver_cache(mc, meta);
|
|
if (unlikely(status < 0)) {
|
|
brick_block_free(mc, PAGE_SIZE);
|
|
goto err;
|
|
}
|
|
msock->s_desc_recv[cache_index] = mc;
|
|
} else if (unlikely(header.h_meta_len > 0)) {
|
|
MARS_WRN("#%d called from line %d has %d unexpected meta bytes\n", msock->s_debug_nr, line, header.h_meta_len);
|
|
status = -EMSGSIZE;
|
|
goto err;
|
|
} else if (unlikely(mc->cache_recver_cookie != (u64)meta)) {
|
|
MARS_ERR("#%d protocol error %p != %p\n", msock->s_debug_nr, meta, (void*)mc->cache_recver_cookie);
|
|
dump_meta((void*)mc->cache_recver_cookie);
|
|
dump_meta(meta);
|
|
status = -EPROTO;
|
|
goto err;
|
|
}
|
|
|
|
for (index = 0; index < mc->cache_items; index++) {
|
|
status = _desc_recv_item(msock, data, mc, index, line);
|
|
if (unlikely(status < 0))
|
|
goto err;
|
|
count++;
|
|
}
|
|
|
|
done:
|
|
if (status >= 0)
|
|
status = count;
|
|
err:
|
|
return status;
|
|
}
|
|
|
|
int mars_send_struct(struct mars_socket *msock, const void *data, const struct meta *meta, bool cork)
|
|
{
|
|
MARS_IO("#%d meta=%p\n", msock->s_debug_nr, meta);
|
|
return desc_send_struct(msock, data, meta, cork);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mars_send_struct);
|
|
|
|
int _mars_recv_struct(struct mars_socket *msock, void *data, const struct meta *meta, int line)
|
|
{
|
|
MARS_IO("#%d meta=%p called from line %d\n", msock->s_debug_nr, meta, line);
|
|
return desc_recv_struct(msock, data, meta, line);
|
|
}
|
|
EXPORT_SYMBOL_GPL(_mars_recv_struct);
|
|
|
|
///////////////////////////////////////////////////////////////////////
|
|
|
|
/* High-level transport of mars structures
|
|
*/
|
|
|
|
const struct meta mars_cmd_meta[] = {
|
|
META_INI_SUB(cmd_stamp, struct mars_cmd, mars_timespec_meta),
|
|
META_INI(cmd_code, struct mars_cmd, FIELD_INT),
|
|
META_INI(cmd_int1, struct mars_cmd, FIELD_INT),
|
|
META_INI(cmd_str1, struct mars_cmd, FIELD_STRING),
|
|
{}
|
|
};
|
|
EXPORT_SYMBOL_GPL(mars_cmd_meta);
|
|
|
|
|
|
int mars_send_mref(struct mars_socket *msock, struct mref_object *mref, bool cork)
|
|
{
|
|
struct mars_cmd cmd = {
|
|
.cmd_code = CMD_MREF,
|
|
.cmd_int1 = mref->ref_id,
|
|
};
|
|
int seq = 0;
|
|
int status;
|
|
|
|
if (mref->ref_rw != 0 && mref->ref_data && mref->ref_cs_mode < 2)
|
|
cmd.cmd_code |= CMD_FLAG_HAS_DATA;
|
|
|
|
if (!cork || !msock->s_pos)
|
|
get_lamport(NULL, &cmd.cmd_stamp);
|
|
|
|
status = desc_send_struct(msock, &cmd, mars_cmd_meta, true);
|
|
if (status < 0)
|
|
goto done;
|
|
|
|
seq = 0;
|
|
status = desc_send_struct(msock, mref, mars_mref_meta, cork || cmd.cmd_code & CMD_FLAG_HAS_DATA);
|
|
if (status < 0)
|
|
goto done;
|
|
|
|
if (cmd.cmd_code & CMD_FLAG_HAS_DATA) {
|
|
status = mars_send_raw(msock, mref->ref_data, mref->ref_len, cork);
|
|
}
|
|
done:
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mars_send_mref);
|
|
|
|
int mars_recv_mref(struct mars_socket *msock, struct mref_object *mref, struct mars_cmd *cmd)
|
|
{
|
|
int status;
|
|
|
|
status = desc_recv_struct(msock, mref, mars_mref_meta, __LINE__);
|
|
if (status < 0)
|
|
goto done;
|
|
|
|
if (cmd->cmd_stamp.tv_sec)
|
|
set_lamport_nonstrict(&cmd->cmd_stamp);
|
|
|
|
if (cmd->cmd_code & CMD_FLAG_HAS_DATA) {
|
|
if (!mref->ref_data)
|
|
mref->ref_data = brick_block_alloc(0, mref->ref_len);
|
|
if (!mref->ref_data) {
|
|
status = -ENOMEM;
|
|
goto done;
|
|
}
|
|
status = mars_recv_raw(msock, mref->ref_data, mref->ref_len, mref->ref_len);
|
|
if (status < 0)
|
|
MARS_WRN("#%d mref_len = %d, status = %d\n", msock->s_debug_nr, mref->ref_len, status);
|
|
}
|
|
done:
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mars_recv_mref);
|
|
|
|
int mars_send_cb(struct mars_socket *msock, struct mref_object *mref, bool cork)
|
|
{
|
|
struct mars_cmd cmd = {
|
|
.cmd_code = CMD_CB,
|
|
.cmd_int1 = mref->ref_id,
|
|
};
|
|
int seq = 0;
|
|
int status;
|
|
|
|
if (mref->ref_rw == 0 && mref->ref_data && mref->ref_cs_mode < 2)
|
|
cmd.cmd_code |= CMD_FLAG_HAS_DATA;
|
|
|
|
if (!cork || !msock->s_pos)
|
|
get_lamport(NULL, &cmd.cmd_stamp);
|
|
|
|
status = desc_send_struct(msock, &cmd, mars_cmd_meta, true);
|
|
if (status < 0)
|
|
goto done;
|
|
|
|
seq = 0;
|
|
status = desc_send_struct(msock, mref, mars_mref_meta, cork || cmd.cmd_code & CMD_FLAG_HAS_DATA);
|
|
if (status < 0)
|
|
goto done;
|
|
|
|
if (cmd.cmd_code & CMD_FLAG_HAS_DATA) {
|
|
MARS_IO("#%d sending blocklen = %d\n", msock->s_debug_nr, mref->ref_len);
|
|
status = mars_send_raw(msock, mref->ref_data, mref->ref_len, cork);
|
|
}
|
|
done:
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mars_send_cb);
|
|
|
|
int mars_recv_cb(struct mars_socket *msock, struct mref_object *mref, struct mars_cmd *cmd)
|
|
{
|
|
int status;
|
|
|
|
status = desc_recv_struct(msock, mref, mars_mref_meta, __LINE__);
|
|
if (status < 0)
|
|
goto done;
|
|
|
|
if (cmd->cmd_stamp.tv_sec)
|
|
set_lamport_nonstrict(&cmd->cmd_stamp);
|
|
|
|
if (cmd->cmd_code & CMD_FLAG_HAS_DATA) {
|
|
if (!mref->ref_data) {
|
|
MARS_WRN("#%d no internal buffer available\n", msock->s_debug_nr);
|
|
status = -EINVAL;
|
|
goto done;
|
|
}
|
|
MARS_IO("#%d receiving blocklen = %d\n", msock->s_debug_nr, mref->ref_len);
|
|
status = mars_recv_raw(msock, mref->ref_data, mref->ref_len, mref->ref_len);
|
|
}
|
|
done:
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mars_recv_cb);
|
|
|
|
////////////////// module init stuff /////////////////////////
|
|
|
|
char *(*mars_translate_hostname)(const char *name) = NULL;
|
|
EXPORT_SYMBOL_GPL(mars_translate_hostname);
|
|
|
|
bool mars_net_is_alive = false;
|
|
EXPORT_SYMBOL_GPL(mars_net_is_alive);
|
|
|
|
int __init init_mars_net(void)
|
|
{
|
|
MARS_INF("init_net()\n");
|
|
mars_net_is_alive = true;
|
|
return 0;
|
|
}
|
|
|
|
void exit_mars_net(void)
|
|
{
|
|
mars_net_is_alive = false;
|
|
MARS_INF("exit_net()\n");
|
|
}
|