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/* -*- c++ -*- */
/*
* Copyright 2008,2009,2010 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio 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 3, or (at your option)
* any later version.
*
* GNU Radio 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.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "socket_rx_buffer.h"
#include "data_handler.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <errno.h>
#include <fcntl.h>
#include <iostream>
#include <stdexcept>
#include <cstdio>
#define SOCKET_RX_BUFFER_DEBUG 1 // define to 0 or 1
#if SOCKET_RX_BUFFER_DEBUG
#define DEBUG_LOG(x) ::write(2, (x), 1)
#else
#define DEBUG_LOG(X)
#endif
#define DEFAULT_MEM_SIZE 62.5e6 // ~0.5s @ 125 MB/s
#define MAX_MEM_SIZE 1000e6 // ~10.00s @ 100 MB/s.
#define RX_BUF_ALIGNMENT 16 // 16-byte aligned for SIMD (must be power-of-2)
namespace vrt {
const unsigned int socket_rx_buffer::MAX_PKTLEN = 8192;
socket_rx_buffer::socket_rx_buffer(int socket_fd, size_t rx_bufsize)
: d_fd(socket_fd)
{
if (rx_bufsize == 0)
rx_bufsize = (size_t)DEFAULT_MEM_SIZE;
else
rx_bufsize = std::min((size_t)MAX_MEM_SIZE, rx_bufsize);
if (!open(rx_bufsize)){
throw std::runtime_error("socket_rx_buffer::open failed");
}
}
socket_rx_buffer::~socket_rx_buffer()
{
close();
}
bool
socket_rx_buffer::open(size_t buflen)
{
// Increase socket buffer if possible
int rcvbuf_size = buflen;
#if defined(SO_RCVBUFFORCE)
// If we've got CAP_NET_ADMIN or root, this will allow the
// rmem_max limit to be overridden
if (setsockopt(d_fd, SOL_SOCKET, SO_RCVBUFFORCE,
&rcvbuf_size, sizeof(rcvbuf_size)) == 0){
return true;
}
else {
if (errno != EPERM)
perror("setsockopt(SO_RCVBUFFORCE)");
}
#endif
// Try to set it. On linux trying for too large of a value
// doesn't return an error...
if (setsockopt(d_fd, SOL_SOCKET, SO_RCVBUF,
&rcvbuf_size, sizeof(rcvbuf_size)) != 0){
perror("setsockopt(SO_RCVBUF)");
}
// See how big it actually is
int cursize = 0;
socklen_t optlen;
optlen = sizeof(cursize);
if (getsockopt(d_fd, SOL_SOCKET, SO_RCVBUF,
&cursize, &optlen) != 0){
perror("getsockopt");
return false;
}
// fprintf(stderr, "after: getsockopt(SO_RCVBUF) = %d\n", cursize);
// If we don't get what we asked for, treat it as an error.
// Otherwise the radio's probably not going to work reliably anyway.
if (cursize < (int) buflen){
fprintf(stderr,
"socket_rx_buffer: failed to allocate socket receive buffer of size %zd.\n",
buflen);
fprintf(stderr,
"To fix this, please increase the maximum allowed using:\n\n");
fprintf(stderr,
" $ sudo sysctl -w net.core.rmem_max=%zd\n\n", buflen);
fprintf(stderr,
"and/or edit /etc/sysctl.conf: net.core.rmem_max=%zd\n\n", buflen);
return false;
}
return true;
}
bool
socket_rx_buffer::close()
{
return true;
}
socket_rx_buffer::result
socket_rx_buffer::rx_frames(data_handler *f, int timeout_in_ms)
{
unsigned char unaligned[MAX_PKTLEN + RX_BUF_ALIGNMENT];
unsigned char *buf = (unsigned char *)
(((intptr_t)unaligned + RX_BUF_ALIGNMENT) & -RX_BUF_ALIGNMENT);
bool dont_wait = timeout_in_ms == 0; // FIXME treating timeout as 0 or inf
int flags = dont_wait ? MSG_DONTWAIT : 0;
ssize_t rr = recv(d_fd, buf, MAX_PKTLEN, flags);
if (rr == -1){ // error?
if (errno == EAGAIN){ // non-blocking, nothing there
return EB_WOULD_BLOCK;
}
perror("rx_frames: recv");
return EB_ERROR;
}
// Got first packet. Call handler
bool want_more = (*f)(buf, rr);
if (!want_more)
return EB_OK;
// Now do as many as we can without blocking
while (1){
rr = recv(d_fd, buf, MAX_PKTLEN, MSG_DONTWAIT);
if (rr == -1){ // error?
if (errno == EAGAIN) // non-blocking, nothing there
return EB_OK; // return OK; we've processed >= 1 packets
perror("rx_frames: recv");
return EB_ERROR;
}
want_more = (*f)(buf, rr);
if (!want_more)
break;
}
return EB_OK;
}
} // namespace vrt
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