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mars/kernel/mars_net.c

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/*
* MARS Long Distance Replication Software
*
* This file is part of MARS project: http://schoebel.github.io/mars/
*
* Copyright (C) 2010-2014 Thomas Schoebel-Theuer
* Copyright (C) 2011-2014 1&1 Internet AG
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
//#define BRICK_DEBUGGING
//#define MARS_DEBUGGING
//#define IO_DEBUGGING
//#define LOWLEVEL_DEBUGGING
#ifdef LOWLEVEL_DEBUGGING
#define MARS_LOW MARS_IO
#else
#define MARS_LOW(args...) /*empty*/
#endif
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/moduleparam.h>
#include "mars.h"
#include "mars_net.h"
#undef USE_SENDPAGE // FIXME: does not work, leads to data corruption (probably due to races with asynchrous sending)
////////////////////////////////////////////////////////////////////
#define USE_BUFFERING
/* Low-level network traffic
*/
int mars_net_default_port = CONFIG_MARS_DEFAULT_PORT;
EXPORT_SYMBOL_GPL(mars_net_default_port);
module_param_named(mars_port, mars_net_default_port, int, 0);
__u32 enabled_net_compressions = 0;
__u32 used_net_compression = 0;
/* TODO: allow binding to specific source addresses instead of catch-all.
* TODO: make all the socket options configurable.
* TODO: implement signal handling.
* TODO: add authentication.
* TODO: add compression / encryption.
*/
struct mars_tcp_params mars_tcp_params[MARS_TRAFFIC_MAX] = {
[MARS_TRAFFIC_META] = {
.ip_tos = IPTOS_LOWDELAY,
.tcp_window_size = 8 * 1024 * 1024,
.tcp_nodelay = 0,
.tcp_timeout = 2,
.tcp_keepcnt = 3,
.tcp_keepintvl = 3,
.tcp_keepidle = 4,
},
[MARS_TRAFFIC_REPLICATION] = {
.ip_tos = IPTOS_RELIABILITY,
.tcp_window_size = 8 * 1024 * 1024,
.tcp_nodelay = 0,
.tcp_timeout = 2,
.tcp_keepcnt = 3,
.tcp_keepintvl = 3,
.tcp_keepidle = 4,
},
[MARS_TRAFFIC_SYNC] = {
.ip_tos = IPTOS_MINCOST,
.tcp_window_size = 8 * 1024 * 1024,
.tcp_nodelay = 0,
.tcp_timeout = 2,
.tcp_keepcnt = 3,
.tcp_keepintvl = 3,
.tcp_keepidle = 4,
},
};
static
void __setsockopt(struct socket *sock, int level, int optname, char *optval, int optsize)
{
int status = kernel_setsockopt(sock, level, optname, optval, optsize);
if (status < 0) {
MARS_WRN("cannot set %d socket option %d to value %d, status = %d\n",
level, optname, *(int*)optval, status);
}
}
#define _setsockopt(sock,level,optname,val) __setsockopt(sock, level, optname, (char*)&(val), sizeof(val))
int mars_create_sockaddr(struct sockaddr_storage *addr, const char *spec)
{
struct sockaddr_in *sockaddr = (void*)addr;
const char *new_spec;
const char *tmp_spec;
int status = 0;
memset(addr, 0, sizeof(*addr));
sockaddr->sin_family = AF_INET;
sockaddr->sin_port = htons(mars_net_default_port);
/* Try to translate hostnames to IPs if possible.
*/
if (mars_translate_hostname) {
new_spec = mars_translate_hostname(spec);
} else {
new_spec = brick_strdup(spec);
}
tmp_spec = new_spec;
/* This is PROVISIONARY!
* TODO: add IPV6 syntax and many more features :)
*/
if (!*tmp_spec)
goto done;
if (*tmp_spec == '(') {
/* fail silently, this can happen with "(none)" */
status = -EINVAL;
goto done;
}
if (*tmp_spec != ':') {
unsigned char u0 = 0, u1 = 0, u2 = 0, u3 = 0;
status = sscanf(tmp_spec, "%hhu.%hhu.%hhu.%hhu", &u0, &u1, &u2, &u3);
if (status != 4) {
MARS_ERR("invalid sockaddr IP syntax '%s', status = %d\n", tmp_spec, status);
status = -EINVAL;
goto done;
}
MARS_DBG("decoded IP = %u.%u.%u.%u\n", u0, u1, u2, u3);
sockaddr->sin_addr.s_addr = (__be32)u0 | (__be32)u1 << 8 | (__be32)u2 << 16 | (__be32)u3 << 24;
}
// deocde port number (when present)
tmp_spec = spec;
while (*tmp_spec && *tmp_spec++ != ':')
/*empty*/;
if (*tmp_spec) {
int port = 0;
status = sscanf(tmp_spec, "%d", &port);
if (status != 1) {
MARS_ERR("invalid sockaddr PORT syntax '%s', status = %d\n", tmp_spec, status);
status = -EINVAL;
goto done;
}
MARS_DBG("decoded PORT = %d\n", port);
sockaddr->sin_port = htons(port);
}
status = 0;
done:
brick_string_free(new_spec);
return status;
}
EXPORT_SYMBOL_GPL(mars_create_sockaddr);
static int current_debug_nr = 0; // no locking, just for debugging
static
void _set_socketopts(struct socket *sock, struct mars_tcp_params *params, bool is_server)
{
struct timeval t = {
.tv_sec = params->tcp_timeout,
};
int x_true = 1;
/* TODO: improve this by a table-driven approach
*/
if (is_server) {
/* extra options for server sockets */
_setsockopt(sock, SOL_SOCKET, IP_FREEBIND, x_true);
}
sock->sk->sk_rcvtimeo = sock->sk->sk_sndtimeo = params->tcp_timeout * HZ;
sock->sk->sk_reuse = 1;
_setsockopt(sock, SOL_SOCKET, SO_SNDBUFFORCE, params->tcp_window_size);
_setsockopt(sock, SOL_SOCKET, SO_RCVBUFFORCE, params->tcp_window_size);
#ifdef CONFIG_MARS_IPv4_TOS
_setsockopt(sock, SOL_IP, IP_TOS, params->ip_tos);
#endif
_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, params->tcp_nodelay);
_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, x_true);
_setsockopt(sock, IPPROTO_TCP, TCP_KEEPCNT, params->tcp_keepcnt);
_setsockopt(sock, IPPROTO_TCP, TCP_KEEPINTVL, params->tcp_keepintvl);
_setsockopt(sock, IPPROTO_TCP, TCP_KEEPIDLE, params->tcp_keepidle);
_setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, t);
_setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, t);
}
int mars_create_socket(struct mars_socket *msock,
struct sockaddr_storage *addr,
struct mars_tcp_params *params,
bool is_server)
{
struct socket *sock;
struct sockaddr *sockaddr = (void*)addr;
int status = -EEXIST;
if (!mars_net_is_alive)
goto final;
if (unlikely(atomic_read(&msock->s_count))) {
MARS_ERR("#%d socket already in use\n", msock->s_debug_nr);
goto final;
}
if (unlikely(msock->s_socket)) {
MARS_ERR("#%d socket already open\n", msock->s_debug_nr);
goto final;
}
atomic_set(&msock->s_count, 1);
#ifdef __HAS_STRUCT_NET
status = sock_create_kern(&init_net, AF_INET, SOCK_STREAM, IPPROTO_TCP, &msock->s_socket);
#else
status = sock_create_kern(AF_INET, SOCK_STREAM, IPPROTO_TCP, &msock->s_socket);
#endif
if (unlikely(status < 0 || !msock->s_socket)) {
msock->s_socket = NULL;
MARS_WRN("cannot create socket, status = %d\n", status);
goto final;
}
msock->s_debug_nr = ++current_debug_nr;
sock = msock->s_socket;
CHECK_PTR(sock, done);
msock->s_alive = true;
msock->s_connected = false;
_set_socketopts(sock, params, is_server);
if (is_server) {
status = kernel_bind(sock, sockaddr, sizeof(*sockaddr));
if (unlikely(status < 0)) {
MARS_WRN("#%d bind failed, status = %d\n", msock->s_debug_nr, status);
goto done;
}
status = kernel_listen(sock, 16);
if (status < 0) {
MARS_WRN("#%d listen failed, status = %d\n", msock->s_debug_nr, status);
}
} else {
status = kernel_connect(sock, sockaddr, sizeof(*sockaddr), O_NONBLOCK);
/* Treat non-blocking connects as successful.
* Any potential errors will show up later during traffic.
*/
if (status == -EINPROGRESS) {
MARS_DBG("#%d connect in progress\n", msock->s_debug_nr);
status = 0;
}
if (status < 0) {
MARS_DBG("#%d connect failed, status = %d\n", msock->s_debug_nr, status);
}
}
done:
if (status < 0) {
mars_put_socket(msock);
} else {
MARS_DBG("successfully created socket #%d\n", msock->s_debug_nr);
}
final:
return status;
}
EXPORT_SYMBOL_GPL(mars_create_socket);
int mars_accept_socket(struct mars_socket *new_msock,
struct mars_socket *old_msock,
struct mars_tcp_params *params)
{
int status = -ENOENT;
struct socket *new_socket = NULL;
bool ok;
if (!mars_net_is_alive)
goto final;
ok = mars_get_socket(old_msock);
if (likely(ok)) {
struct socket *sock = old_msock->s_socket;
if (unlikely(!sock)) {
goto err;
}
status = kernel_accept(sock, &new_socket, O_NONBLOCK);
if (unlikely(status < 0)) {
goto err;
}
if (unlikely(!new_socket)) {
status = -EBADF;
goto err;
}
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);
_set_socketopts(new_socket, params, false);
memset(new_msock, 0, sizeof(struct mars_socket));
new_msock->s_socket = new_socket;
atomic_set(&new_msock->s_count, 1);
new_msock->s_alive = true;
new_msock->s_debug_nr = ++current_debug_nr;
MARS_DBG("#%d successfully accepted socket #%d\n", old_msock->s_debug_nr, new_msock->s_debug_nr);
status = 0;
err:
mars_put_socket(old_msock);
}
final:
return status;
}
EXPORT_SYMBOL_GPL(mars_accept_socket);
bool mars_get_socket(struct mars_socket *msock)
{
MARS_LOW("#%d get socket %p s_count=%d\n", msock->s_debug_nr, msock->s_socket, atomic_read(&msock->s_count));
if (unlikely(atomic_read(&msock->s_count) <= 0)) {
MARS_ERR("#%d bad nesting on msock = %p\n", msock->s_debug_nr, msock);
return false;
}
atomic_inc(&msock->s_count);
if (unlikely(!msock->s_socket || !msock->s_alive)) {
mars_put_socket(msock);
return false;
}
MARS_LOW("#%d got socket\n", msock->s_debug_nr);
return true;
}
EXPORT_SYMBOL_GPL(mars_get_socket);
void mars_put_socket(struct mars_socket *msock)
{
MARS_LOW("#%d put socket %p s_count=%d\n", msock->s_debug_nr, msock->s_socket, atomic_read(&msock->s_count));
if (unlikely(atomic_read(&msock->s_count) <= 0)) {
MARS_ERR("#%d bad nesting on msock = %p sock = %p\n", msock->s_debug_nr, msock, msock->s_socket);
} else if (atomic_dec_and_test(&msock->s_count)) {
struct socket *sock = msock->s_socket;
int i;
MARS_DBG("#%d closing socket %p\n", msock->s_debug_nr, sock);
if (likely(sock && cmpxchg(&msock->s_alive, true, false))) {
kernel_sock_shutdown(sock, SHUT_RDWR);
}
if (likely(sock && !msock->s_alive)) {
MARS_DBG("#%d releasing socket %p\n", msock->s_debug_nr, sock);
sock_release(sock);
}
for (i = 0; i < MAX_DESC_CACHE; i++) {
brick_block_free(msock->s_desc_send[i], PAGE_SIZE);
brick_block_free(msock->s_desc_recv[i], PAGE_SIZE);
}
brick_block_free(msock->s_buffer, PAGE_SIZE);
memset(msock, 0, sizeof(struct mars_socket));
}
}
EXPORT_SYMBOL_GPL(mars_put_socket);
void mars_shutdown_socket(struct mars_socket *msock)
{
MARS_IO("#%d shutdown socket %p s_count=%d\n", msock->s_debug_nr, msock->s_socket, atomic_read(&msock->s_count));
if (msock->s_socket) {
bool ok = mars_get_socket(msock);
if (likely(ok)) {
struct socket *sock = msock->s_socket;
if (likely(sock && cmpxchg(&msock->s_alive, true, false))) {
MARS_DBG("#%d shutdown socket %p\n", msock->s_debug_nr, sock);
msock->s_connected = false;
kernel_sock_shutdown(sock, SHUT_RDWR);
}
mars_put_socket(msock);
}
}
}
EXPORT_SYMBOL_GPL(mars_shutdown_socket);
bool mars_socket_is_alive(struct mars_socket *msock)
{
bool ok;
bool res = false;
if (!mars_net_is_alive)
goto done;
if (!msock->s_socket || !msock->s_alive)
goto done;
if (unlikely(atomic_read(&msock->s_count) <= 0)) {
MARS_ERR("#%d bad nesting on msock = %p sock = %p\n", msock->s_debug_nr, msock, msock->s_socket);
goto done;
}
ok = mars_get_socket(msock);
if (likely(ok)) {
struct socket *sock = msock->s_socket;
if (sock->state == SS_CONNECTED) {
msock->s_connected = true;
} else if (msock->s_connected) {
MARS_DBG("#%d remote side hangup %p sock = %p\n", msock->s_debug_nr, msock, msock->s_socket);
goto done;
}
mars_put_socket(msock);
}
res = true;
done:
MARS_LOW("#%d %p s_count = %d\n", msock->s_debug_nr, msock->s_socket, atomic_read(&msock->s_count));
return res;
}
EXPORT_SYMBOL_GPL(mars_socket_is_alive);
long mars_socket_send_space_available(struct mars_socket *msock)
{
struct socket *raw_sock = msock->s_socket;
long res = 0;
if (!msock->s_alive || !raw_sock || !raw_sock->sk)
goto done;
if (unlikely(atomic_read(&msock->s_count) <= 0)) {
MARS_ERR("#%d bad nesting on msock = %p sock = %p\n", msock->s_debug_nr, msock, msock->s_socket);
goto done;
}
res = raw_sock->sk->sk_sndbuf - raw_sock->sk->sk_wmem_queued;
if (res < 0)
res = 0;
res += msock->s_pos;
done:
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;
int backoff = 0;
int sent = 0;
int status = 0;
msock->s_send_cnt = 0;
while (len > 0) {
int this_len = len;
struct socket *sock = msock->s_socket;
if (unlikely(!sock || !mars_net_is_alive || brick_thread_should_stop())) {
MARS_WRN("interrupting, sent = %d\n", sent);
status = -EIDRM;
break;
}
#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);
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;
}
flush_signals(current);
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;
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;
}
if (minlen < maxlen) {
/* Use nonblocking reads to consume as much data
* as possible
*/
msg.msg_flags |= O_NONBLOCK;
}
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) {
flush_signals(current);
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;
}
flush_signals(current);
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;
}
}
MARS_WRN("field %2d '%s' is missing\n", count, meta->field_name);
found:;
}
done:
if (unlikely(!count)) {
MARS_ERR("bad protocol: ALL fields are missing\n");
}
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_lamport_time_meta),
META_INI(cmd_proto, struct mars_cmd, FIELD_INT),
META_INI(cmd_code, struct mars_cmd, FIELD_INT),
META_INI(cmd_compr_flags, struct mars_cmd, FIELD_UINT),
META_INI(cmd_compr_len, struct mars_cmd, FIELD_INT),
META_INI(cmd_int1, struct mars_cmd, FIELD_INT),
META_INI(cmd_str1, struct mars_cmd, FIELD_STRING),
META_INI(cmd_str2, struct mars_cmd, FIELD_STRING),
{}
};
int mars_send_cmd(struct mars_socket *msock, struct mars_cmd *cmd, bool cork)
{
int status;
cmd->cmd_proto = MARS_PROTO_LEVEL;
if (!cork || !msock->s_pos)
get_lamport(NULL, &cmd->cmd_stamp);
status = desc_send_struct(msock, cmd, mars_cmd_meta, cork);
return status;
}
int _mars_recv_cmd(struct mars_socket *msock, struct mars_cmd *cmd, int line)
{
int status;
status = desc_recv_struct(msock, cmd, mars_cmd_meta, line);
if (status >= 0) {
msock->s_remote_proto_level = cmd->cmd_proto;
msock->s_common_proto_level = min(cmd->cmd_proto, MARS_PROTO_LEVEL);
if (cmd->cmd_stamp.tv_sec)
set_lamport_nonstrict(&cmd->cmd_stamp);
}
return status;
}
/* This should be removed some day
*/
static void _send_deprecated(struct mref_object *mref)
{
/* compatibility to old protocol */
if (mref->ref_flags & MREF_WRITE)
mref->ref_rw = 1;
if (mref->ref_flags & MREF_MAY_WRITE)
mref->ref_may_write = 1;
if (mref->ref_flags & MREF_SKIP_SYNC)
mref->ref_skip_sync = true;
if (mref->ref_flags & MREF_CHKSUM_ANY) {
mref->ref_cs_mode = 1;
if (mref->ref_flags & MREF_NODATA)
mref->ref_cs_mode = 2;
}
}
static
int _mars_send_mref(struct mars_socket *msock,
struct mref_object *mref,
struct mars_cmd *cmd,
bool cork)
{
__u32 compr_flags = 0;
void *compr_buf = NULL;
int compr_len = 0;
int seq = 0;
int status;
if ((cmd->cmd_code & CMD_FLAG_HAS_DATA) &&
(mref->ref_flags & MREF_COMPRESS_ANY)) {
compr_buf = brick_mem_alloc(mref->ref_len + compress_overhead);
compr_len = mars_compress(mref->ref_data, mref->ref_len,
compr_buf, mref->ref_len,
mref->ref_flags, &compr_flags);
if (likely(compr_len > 0 &&
compr_len < mref->ref_len &&
compr_flags)) {
used_net_compression = compr_flags;
cmd->cmd_compr_flags = compr_flags;
cmd->cmd_compr_len = compr_len;
} else {
/* continue with old uncompressed method */
brick_mem_free(compr_buf);
compr_buf = NULL;
}
}
status = mars_send_cmd(msock, cmd, 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) {
if (compr_buf) {
MARS_IO("#%d sending compressed len = %d/%d\n",
msock->s_debug_nr, compr_len, mref->ref_len);
status = mars_send_raw(msock,
compr_buf, compr_len,
cork);
goto done;
}
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:
brick_mem_free(compr_buf);
return status;
}
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 status;
/* compatibility to old protocol */
_send_deprecated(mref);
if ((mref->ref_flags & MREF_WRITE) &&
mref->ref_data &&
!(mref->ref_flags & MREF_NODATA))
cmd.cmd_code |= CMD_FLAG_HAS_DATA;
status = _mars_send_mref(msock, mref, &cmd, cork);
return status;
}
/* This should be removed some day
*/
static void _recv_deprecated(struct mref_object *mref)
{
int cs_mode;
/* compatibility to old protocol */
if (mref->ref_rw) {
mref->ref_rw = 0;
mref->ref_flags |= MREF_WRITE;
}
if (mref->ref_may_write) {
mref->ref_may_write = 0;
mref->ref_flags |= MREF_MAY_WRITE;
}
if (mref->ref_skip_sync) {
mref->ref_skip_sync = false;
mref->ref_flags |= MREF_SKIP_SYNC;
}
cs_mode = mref->ref_cs_mode;
if (cs_mode) {
mref->ref_cs_mode = 0;
mref->ref_flags |= MREF_CHKSUM_MD5_OLD;
if (cs_mode > 1)
mref->ref_flags |= MREF_NODATA;
}
}
int mars_recv_mref(struct mars_socket *msock, struct mref_object *mref, struct mars_cmd *cmd)
{
void *tmp_buf = NULL;
int status;
status = desc_recv_struct(msock, mref, mars_mref_meta, __LINE__);
if (status < 0)
goto done;
/* compatibility to old protocol */
_recv_deprecated(mref);
if (cmd->cmd_compr_flags && cmd->cmd_compr_len) {
void *decompr_buf;
tmp_buf = brick_mem_alloc(cmd->cmd_compr_len);
status = mars_recv_raw(msock,
tmp_buf,
cmd->cmd_compr_len,
cmd->cmd_compr_len);
if (status < 0) {
MARS_WRN("#%d compr_len = %d mref_len = %d, status = %d\n",
msock->s_debug_nr,
cmd->cmd_compr_len, mref->ref_len,
status);
goto done;
}
/* Ensure that ref_data is block-aligned */
if (!mref->ref_data)
mref->ref_data = brick_block_alloc(0, mref->ref_len);
status = -EBADMSG;
decompr_buf =
mars_decompress(tmp_buf, cmd->cmd_compr_len,
mref->ref_data, mref->ref_len,
cmd->cmd_compr_flags);
if (unlikely(!decompr_buf))
goto done;
/* decompression success */
mref->ref_data = decompr_buf;
status = mref->ref_len;
goto done;
}
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:
brick_mem_free(tmp_buf);
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 status;
/* compatibility to old protocol */
_send_deprecated(mref);
if (!(mref->ref_flags & MREF_WRITE) &&
mref->ref_data &&
!(mref->ref_flags & MREF_NODATA))
cmd.cmd_code |= CMD_FLAG_HAS_DATA;
status = _mars_send_mref(msock, mref, &cmd, cork);
return status;
}
int mars_recv_cb(struct mars_socket *msock, struct mref_object *mref, struct mars_cmd *cmd)
{
int status;
if (cmd->cmd_code & CMD_FLAG_HAS_DATA && !mref->ref_data) {
MARS_WRN("#%d no internal buffer available\n", msock->s_debug_nr);
status = -EINVAL;
goto done;
}
status = mars_recv_mref(msock, mref, cmd);
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");
}
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