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/*
* PIM for Quagga
* Copyright (C) 2008 Everton da Silva Marques
*
* 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; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zebra.h>
#include <lib/log.h>
#include <lib/lib_errors.h>
#include "pimd.h"
#include "pim_mlag.h"
#include "pim_zebra.h"
extern struct zclient *zclient;
#define PIM_MLAG_POST_LIMIT 100
int32_t mlag_bulk_cnt;
static void pim_mlag_zebra_fill_header(enum mlag_msg_type msg_type)
{
uint32_t fill_msg_type = msg_type;
uint16_t data_len;
uint16_t msg_cnt = 1;
if (msg_type == MLAG_MSG_NONE)
return;
switch (msg_type) {
case MLAG_REGISTER:
case MLAG_DEREGISTER:
data_len = sizeof(struct mlag_msg);
break;
case MLAG_MROUTE_ADD:
data_len = sizeof(struct mlag_mroute_add);
fill_msg_type = MLAG_MROUTE_ADD_BULK;
break;
case MLAG_MROUTE_DEL:
data_len = sizeof(struct mlag_mroute_del);
fill_msg_type = MLAG_MROUTE_DEL_BULK;
break;
default:
data_len = 0;
break;
}
stream_reset(router->mlag_stream);
/* ADD Hedaer */
stream_putl(router->mlag_stream, fill_msg_type);
/*
* In case of Bulk actual size & msg_cnt will be updated
* just before writing onto zebra
*/
stream_putw(router->mlag_stream, data_len);
stream_putw(router->mlag_stream, msg_cnt);
if (PIM_DEBUG_MLAG)
zlog_debug(":%s: msg_type: %d/%d len %d",
__func__, msg_type, fill_msg_type, data_len);
}
static void pim_mlag_zebra_flush_buffer(void)
{
uint32_t msg_type;
/* Stream had bulk messages update the Hedaer */
if (mlag_bulk_cnt > 1) {
/*
* No need to reset the pointer, below api reads from data[0]
*/
STREAM_GETL(router->mlag_stream, msg_type);
if (msg_type == MLAG_MROUTE_ADD_BULK) {
stream_putw_at(
router->mlag_stream, 4,
(mlag_bulk_cnt * sizeof(struct mlag_mroute_add)));
stream_putw_at(router->mlag_stream, 6, mlag_bulk_cnt);
} else if (msg_type == MLAG_MROUTE_DEL_BULK) {
stream_putw_at(
router->mlag_stream, 4,
(mlag_bulk_cnt * sizeof(struct mlag_mroute_del)));
stream_putw_at(router->mlag_stream, 6, mlag_bulk_cnt);
} else {
flog_err(EC_LIB_ZAPI_ENCODE,
"unknown bulk message type %d bulk_count %d",
msg_type, mlag_bulk_cnt);
stream_reset(router->mlag_stream);
mlag_bulk_cnt = 0;
return;
}
}
zclient_send_mlag_data(zclient, router->mlag_stream);
stream_failure:
stream_reset(router->mlag_stream);
mlag_bulk_cnt = 0;
}
/*
* Only ROUTE add & Delete will be bulked.
* Buffer will be flushed, when
* 1) there were no messages in the queue
* 2) Curr_msg_type != prev_msg_type
*/
static void pim_mlag_zebra_check_for_buffer_flush(uint32_t curr_msg_type,
uint32_t prev_msg_type)
{
/* First Message, keep bulking */
if (prev_msg_type == MLAG_MSG_NONE) {
mlag_bulk_cnt = 1;
return;
}
/*msg type is route add & delete, keep bulking */
if (curr_msg_type == prev_msg_type
&& (curr_msg_type == MLAG_MROUTE_ADD
|| curr_msg_type == MLAG_MROUTE_DEL)) {
mlag_bulk_cnt++;
return;
}
pim_mlag_zebra_flush_buffer();
}
/*
* Thsi thread reads the clients data from the Gloabl queue and encodes with
* protobuf and pass on to the MLAG socket.
*/
static void pim_mlag_zthread_handler(struct thread *event)
{
struct stream *read_s;
uint32_t wr_count = 0;
uint32_t prev_msg_type = MLAG_MSG_NONE;
uint32_t curr_msg_type = MLAG_MSG_NONE;
router->zpthread_mlag_write = NULL;
wr_count = stream_fifo_count_safe(router->mlag_fifo);
if (PIM_DEBUG_MLAG)
zlog_debug(":%s: Processing MLAG write, %d messages in queue",
__func__, wr_count);
if (wr_count == 0)
return;
for (wr_count = 0; wr_count < PIM_MLAG_POST_LIMIT; wr_count++) {
/* FIFO is empty,wait for teh message to be add */
if (stream_fifo_count_safe(router->mlag_fifo) == 0)
break;
read_s = stream_fifo_pop_safe(router->mlag_fifo);
if (!read_s) {
zlog_debug(":%s: Got a NULL Messages, some thing wrong",
__func__);
break;
}
STREAM_GETL(read_s, curr_msg_type);
/*
* Check for Buffer Overflow,
* MLAG Can't process more than 'PIM_MLAG_BUF_LIMIT' bytes
*/
if (router->mlag_stream->endp + read_s->endp + ZEBRA_HEADER_SIZE
> MLAG_BUF_LIMIT)
pim_mlag_zebra_flush_buffer();
pim_mlag_zebra_check_for_buffer_flush(curr_msg_type,
prev_msg_type);
/*
* First message to Buffer, fill the Header
*/
if (router->mlag_stream->endp == 0)
pim_mlag_zebra_fill_header(curr_msg_type);
/*
* add the data now
*/
stream_put(router->mlag_stream, read_s->data + read_s->getp,
read_s->endp - read_s->getp);
stream_free(read_s);
prev_msg_type = curr_msg_type;
}
stream_failure:
/*
* we are here , because
* 1. Queue might be empty
* 2. we crossed the max Q Read limit
* In any acse flush the buffer towards zebra
*/
pim_mlag_zebra_flush_buffer();
if (wr_count >= PIM_MLAG_POST_LIMIT)
pim_mlag_signal_zpthread();
}
int pim_mlag_signal_zpthread(void)
{
if (router->master) {
if (PIM_DEBUG_MLAG)
zlog_debug(":%s: Scheduling PIM MLAG write Thread",
__func__);
thread_add_event(router->master, pim_mlag_zthread_handler, NULL,
0, &router->zpthread_mlag_write);
}
return (0);
}
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