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Date: Thu, 31 Dec 2015 12:36:18 +0100
From: Thomas Schoebel-Theuer <tst@...oebel-theuer.de>
To: linux-kernel@...r.kernel.org, tst@...oebel-theuer.de
Subject: [RFC 23/31] mars: add new module xio_server
Signed-off-by: Thomas Schoebel-Theuer <tst@...oebel-theuer.de>
---
drivers/staging/mars/xio_bricks/xio_server.c | 486 +++++++++++++++++++++++++++
include/linux/xio/xio_server.h | 91 +++++
2 files changed, 577 insertions(+)
create mode 100644 drivers/staging/mars/xio_bricks/xio_server.c
create mode 100644 include/linux/xio/xio_server.h
diff --git a/drivers/staging/mars/xio_bricks/xio_server.c b/drivers/staging/mars/xio_bricks/xio_server.c
new file mode 100644
index 0000000..95a3327
--- /dev/null
+++ b/drivers/staging/mars/xio_bricks/xio_server.c
@@ -0,0 +1,486 @@
+/*
+ * MARS Long Distance Replication Software
+ *
+ * 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.
+ */
+
+/* Server brick (just for demonstration) */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+
+#include <linux/brick/brick.h>
+#include <linux/xio/xio.h>
+#include <linux/xio/xio_bio.h>
+#include <linux/xio/xio_sio.h>
+
+/************************ own type definitions ***********************/
+
+#include <linux/xio/xio_server.h>
+
+static struct xio_socket server_socket[NR_SERVER_SOCKETS];
+static struct task_struct *server_threads[NR_SERVER_SOCKETS];
+
+/************************ own helper functions ***********************/
+
+int cb_thread(void *data)
+{
+ struct server_brick *brick = data;
+ struct xio_socket *sock = &brick->handler_socket;
+ bool aborted = false;
+ bool ok = xio_get_socket(sock);
+ int status = -EINVAL;
+
+ XIO_DBG("--------------- cb_thread starting on socket #%d, ok = %d\n", sock->s_debug_nr, ok);
+ if (!ok)
+ goto done;
+
+ brick->cb_running = true;
+ wake_up_interruptible(&brick->startup_event);
+
+ while (!brick_thread_should_stop() || !list_empty(&brick->cb_read_list) || !list_empty(&brick->cb_write_list) || atomic_read(&brick->in_flight) > 0) {
+ struct server_aio_aspect *aio_a;
+ struct aio_object *aio;
+ struct list_head *tmp;
+ unsigned long flags;
+
+ wait_event_interruptible_timeout(
+ brick->cb_event,
+ !list_empty(&brick->cb_read_list) ||
+ !list_empty(&brick->cb_write_list),
+ 1 * HZ);
+
+ spin_lock_irqsave(&brick->cb_lock, flags);
+ tmp = brick->cb_write_list.next;
+ if (tmp == &brick->cb_write_list) {
+ tmp = brick->cb_read_list.next;
+ if (tmp == &brick->cb_read_list) {
+ spin_unlock_irqrestore(&brick->cb_lock, flags);
+ brick_msleep(1000 / HZ);
+ continue;
+ }
+ }
+ list_del_init(tmp);
+ spin_unlock_irqrestore(&brick->cb_lock, flags);
+
+ aio_a = container_of(tmp, struct server_aio_aspect, cb_head);
+ aio = aio_a->object;
+ status = -EINVAL;
+ CHECK_PTR(aio, err);
+
+ status = 0;
+ /* Report a remote error when consistency cannot be guaranteed,
+ * e.g. emergency mode during sync.
+ */
+ if (brick->conn_brick && brick->conn_brick->mode_ptr && *brick->conn_brick->mode_ptr < 0
+ && aio->object_cb)
+ aio->object_cb->cb_error = *brick->conn_brick->mode_ptr;
+ if (!aborted) {
+ down(&brick->socket_sem);
+ status = xio_send_cb(sock, aio);
+ up(&brick->socket_sem);
+ }
+
+err:
+ if (unlikely(status < 0) && !aborted) {
+ aborted = true;
+ XIO_WRN("cannot send response, status = %d\n", status);
+ /* Just shutdown the socket and forget all pending
+ * requests.
+ * The _client_ is responsible for resending
+ * any lost operations.
+ */
+ xio_shutdown_socket(sock);
+ }
+
+ if (aio_a->data) {
+ brick_block_free(aio_a->data, aio_a->len);
+ aio->io_data = NULL;
+ }
+ if (aio_a->do_put) {
+ GENERIC_INPUT_CALL(brick->inputs[0], aio_put, aio);
+ atomic_dec(&brick->in_flight);
+ } else {
+ obj_free(aio);
+ }
+ }
+
+ xio_shutdown_socket(sock);
+ xio_put_socket(sock);
+
+done:
+ XIO_DBG("---------- cb_thread terminating, status = %d\n", status);
+ wake_up_interruptible(&brick->startup_event);
+ return status;
+}
+
+static
+void server_endio(struct generic_callback *cb)
+{
+ struct server_aio_aspect *aio_a;
+ struct aio_object *aio;
+ struct server_brick *brick;
+ int rw;
+ unsigned long flags;
+
+ aio_a = cb->cb_private;
+ CHECK_PTR(aio_a, err);
+ aio = aio_a->object;
+ CHECK_PTR(aio, err);
+ LAST_CALLBACK(cb);
+ if (unlikely(cb != &aio->_object_cb))
+ XIO_ERR("bad cb pointer %p != %p\n", cb, &aio->_object_cb);
+
+ brick = aio_a->brick;
+ if (unlikely(!brick)) {
+ XIO_WRN("late IO callback -- cannot do anything\n");
+ goto out_return;
+ }
+
+ rw = aio->io_rw;
+
+ spin_lock_irqsave(&brick->cb_lock, flags);
+ if (rw)
+ list_add_tail(&aio_a->cb_head, &brick->cb_write_list);
+ else
+ list_add_tail(&aio_a->cb_head, &brick->cb_read_list);
+ spin_unlock_irqrestore(&brick->cb_lock, flags);
+
+ wake_up_interruptible(&brick->cb_event);
+ goto out_return;
+err:
+ XIO_FAT("cannot handle callback - giving up\n");
+out_return:;
+}
+
+int server_io(struct server_brick *brick, struct xio_socket *sock, struct xio_cmd *cmd)
+{
+ struct aio_object *aio;
+ struct server_aio_aspect *aio_a;
+ int amount;
+ int status = -ENOTRECOVERABLE;
+
+ if (!brick->cb_running || !brick->handler_running || !xio_socket_is_alive(sock))
+ goto done;
+
+ aio = server_alloc_aio(brick);
+ status = -ENOMEM;
+ aio_a = server_aio_get_aspect(brick, aio);
+ if (unlikely(!aio_a)) {
+ obj_free(aio);
+ goto done;
+ }
+
+ status = xio_recv_aio(sock, aio, cmd);
+ if (status < 0) {
+ obj_free(aio);
+ goto done;
+ }
+
+ aio_a->brick = brick;
+ aio_a->data = aio->io_data;
+ aio_a->len = aio->io_len;
+ SETUP_CALLBACK(aio, server_endio, aio_a);
+
+ amount = 0;
+ if (!aio->io_cs_mode < 2)
+ amount = (aio->io_len - 1) / 1024 + 1;
+ rate_limit_sleep(&server_limiter, amount);
+
+ status = GENERIC_INPUT_CALL(brick->inputs[0], aio_get, aio);
+ if (unlikely(status < 0)) {
+ XIO_WRN("aio_get execution error = %d\n", status);
+ SIMPLE_CALLBACK(aio, status);
+ status = 0; /* continue serving requests */
+ goto done;
+ }
+ aio_a->do_put = true;
+ atomic_inc(&brick->in_flight);
+ GENERIC_INPUT_CALL(brick->inputs[0], aio_io, aio);
+
+done:
+ return status;
+}
+
+/***************** own brick * input * output operations *****************/
+
+static int server_get_info(struct server_output *output, struct xio_info *info)
+{
+ struct server_input *input = output->brick->inputs[0];
+
+ return GENERIC_INPUT_CALL(input, xio_get_info, info);
+}
+
+static int server_io_get(struct server_output *output, struct aio_object *aio)
+{
+ struct server_input *input = output->brick->inputs[0];
+
+ return GENERIC_INPUT_CALL(input, aio_get, aio);
+}
+
+static void server_io_put(struct server_output *output, struct aio_object *aio)
+{
+ struct server_input *input = output->brick->inputs[0];
+
+ GENERIC_INPUT_CALL(input, aio_put, aio);
+}
+
+static void server_io_io(struct server_output *output, struct aio_object *aio)
+{
+ struct server_input *input = output->brick->inputs[0];
+
+ GENERIC_INPUT_CALL(input, aio_io, aio);
+}
+
+int server_switch(struct server_brick *brick)
+{
+ struct xio_socket *sock = &brick->handler_socket;
+ int status = 0;
+
+ if (brick->power.button) {
+ static int version;
+ bool ok;
+
+ if (brick->power.on_led)
+ goto done;
+
+ ok = xio_get_socket(sock);
+ if (unlikely(!ok)) {
+ status = -ENOENT;
+ goto err;
+ }
+
+ xio_set_power_off_led((void *)brick, false);
+
+ brick->version = version++;
+ brick->handler_thread = brick_thread_create(handler_thread, brick, "xio_handler%d", brick->version);
+ if (unlikely(!brick->handler_thread)) {
+ XIO_ERR("cannot create handler thread\n");
+ status = -ENOENT;
+ goto err;
+ }
+
+ xio_set_power_on_led((void *)brick, true);
+ } else if (!brick->power.off_led) {
+ struct task_struct *thread;
+
+ xio_set_power_on_led((void *)brick, false);
+
+ xio_shutdown_socket(sock);
+
+ thread = brick->handler_thread;
+ if (thread) {
+ brick->handler_thread = NULL;
+ brick->handler_running = false;
+ XIO_DBG("#%d stopping handler thread....\n", sock->s_debug_nr);
+ brick_thread_stop(thread);
+ }
+
+ xio_put_socket(sock);
+ XIO_DBG("#%d socket s_count = %d\n", sock->s_debug_nr, atomic_read(&sock->s_count));
+
+ xio_set_power_off_led((void *)brick, true);
+ }
+err:
+ if (unlikely(status < 0)) {
+ xio_set_power_off_led((void *)brick, true);
+ xio_shutdown_socket(sock);
+ xio_put_socket(sock);
+ }
+done:
+ return status;
+}
+
+/*************** informational * statistics **************/
+
+static
+char *server_statistics(struct server_brick *brick, int verbose)
+{
+ char *res = brick_string_alloc(1024);
+
+ snprintf(res, 1024,
+ "cb_running = %d handler_running = %d in_flight = %d\n",
+ brick->cb_running,
+ brick->handler_running,
+ atomic_read(&brick->in_flight));
+
+ return res;
+}
+
+static
+void server_reset_statistics(struct server_brick *brick)
+{
+}
+
+/*************** object * aspect constructors * destructors **************/
+
+static int server_aio_aspect_init_fn(struct generic_aspect *_ini)
+{
+ struct server_aio_aspect *ini = (void *)_ini;
+
+ INIT_LIST_HEAD(&ini->cb_head);
+ return 0;
+}
+
+static void server_aio_aspect_exit_fn(struct generic_aspect *_ini)
+{
+ struct server_aio_aspect *ini = (void *)_ini;
+
+ CHECK_HEAD_EMPTY(&ini->cb_head);
+}
+
+XIO_MAKE_STATICS(server);
+
+/********************* brick constructors * destructors *******************/
+
+static int server_brick_construct(struct server_brick *brick)
+{
+ init_waitqueue_head(&brick->startup_event);
+ init_waitqueue_head(&brick->cb_event);
+ sema_init(&brick->socket_sem, 1);
+ spin_lock_init(&brick->cb_lock);
+ INIT_LIST_HEAD(&brick->cb_read_list);
+ INIT_LIST_HEAD(&brick->cb_write_list);
+ return 0;
+}
+
+static int server_brick_destruct(struct server_brick *brick)
+{
+ CHECK_HEAD_EMPTY(&brick->cb_read_list);
+ CHECK_HEAD_EMPTY(&brick->cb_write_list);
+ return 0;
+}
+
+static int server_output_construct(struct server_output *output)
+{
+ return 0;
+}
+
+/************************ static structs ***********************/
+
+static struct server_brick_ops server_brick_ops = {
+ .brick_switch = server_switch,
+ .brick_statistics = server_statistics,
+ .reset_statistics = server_reset_statistics,
+};
+
+static struct server_output_ops server_output_ops = {
+ .xio_get_info = server_get_info,
+ .aio_get = server_io_get,
+ .aio_put = server_io_put,
+ .aio_io = server_io_io,
+};
+
+const struct server_input_type server_input_type = {
+ .type_name = "server_input",
+ .input_size = sizeof(struct server_input),
+};
+
+static const struct server_input_type *server_input_types[] = {
+ &server_input_type,
+};
+
+const struct server_output_type server_output_type = {
+ .type_name = "server_output",
+ .output_size = sizeof(struct server_output),
+ .master_ops = &server_output_ops,
+ .output_construct = &server_output_construct,
+};
+
+static const struct server_output_type *server_output_types[] = {
+ &server_output_type,
+};
+
+const struct server_brick_type server_brick_type = {
+ .type_name = "server_brick",
+ .brick_size = sizeof(struct server_brick),
+ .max_inputs = 1,
+ .max_outputs = 0,
+ .master_ops = &server_brick_ops,
+ .aspect_types = server_aspect_types,
+ .default_input_types = server_input_types,
+ .default_output_types = server_output_types,
+ .brick_construct = &server_brick_construct,
+ .brick_destruct = &server_brick_destruct,
+};
+
+/*********************************************************************/
+
+/* strategy layer */
+
+int server_show_statist;
+
+/***************** module init stuff ************************/
+
+struct rate_limiter server_limiter = {
+ .lim_max_rate = 0,
+};
+
+void exit_xio_server(void)
+{
+ int i;
+
+ XIO_INF("exit_server()\n");
+ server_unregister_brick_type();
+
+ for (i = 0; i < NR_SERVER_SOCKETS; i++) {
+ if (server_threads[i]) {
+ XIO_INF("stopping server thread %d...\n", i);
+ brick_thread_stop(server_threads[i]);
+ }
+ XIO_INF("closing server socket %d...\n", i);
+ xio_put_socket(&server_socket[i]);
+ }
+}
+
+int __init init_xio_server(void)
+{
+ int i;
+
+ XIO_INF("init_server()\n");
+
+ for (i = 0; i < NR_SERVER_SOCKETS; i++) {
+ struct sockaddr_storage sockaddr = {};
+ char tmp[64];
+ int status;
+
+ if (xio_translate_hostname)
+ snprintf(tmp, sizeof(tmp), "%s:%d", my_id(), xio_net_default_port + i);
+ else
+ snprintf(tmp, sizeof(tmp), ":%d", xio_net_default_port + i);
+
+ status = xio_create_sockaddr(&sockaddr, tmp);
+ if (unlikely(status < 0)) {
+ exit_xio_server();
+ return status;
+ }
+
+ status = xio_create_socket(&server_socket[i], &sockaddr, NULL);
+ if (unlikely(status < 0)) {
+ XIO_ERR("could not create server socket %d, status = %d\n", i, status);
+ exit_xio_server();
+ return status;
+ }
+
+ server_threads[i] = brick_thread_create(server_thread, &server_socket[i], "xio_server_%d", i);
+ if (unlikely(!server_threads[i] || IS_ERR(server_threads[i]))) {
+ XIO_ERR("could not create server thread %d\n", i);
+ exit_xio_server();
+ return -ENOENT;
+ }
+ }
+
+ return server_register_brick_type();
+}
diff --git a/include/linux/xio/xio_server.h b/include/linux/xio/xio_server.h
new file mode 100644
index 0000000..2c13f26
--- /dev/null
+++ b/include/linux/xio/xio_server.h
@@ -0,0 +1,91 @@
+/*
+ * MARS Long Distance Replication Software
+ *
+ * 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.
+ */
+
+#ifndef XIO_SERVER_H
+#define XIO_SERVER_H
+
+#include <linux/wait.h>
+
+#include <linux/xio/xio_net.h>
+#include <linux/brick/lib_limiter.h>
+
+#define NR_SERVER_SOCKETS 3
+
+extern int server_show_statist;
+
+extern struct rate_limiter server_limiter;
+
+struct server_aio_aspect {
+ GENERIC_ASPECT(aio);
+ struct server_brick *brick;
+ struct list_head cb_head;
+ void *data;
+ int len;
+ bool do_put;
+};
+
+struct server_output {
+ XIO_OUTPUT(server);
+};
+
+struct server_brick {
+ XIO_BRICK(server);
+ struct semaphore socket_sem;
+ struct xio_socket handler_socket;
+ struct xio_brick *conn_brick;
+ struct task_struct *handler_thread;
+ struct task_struct *cb_thread;
+
+ wait_queue_head_t startup_event;
+ wait_queue_head_t cb_event;
+ spinlock_t cb_lock;
+ struct list_head cb_read_list;
+ struct list_head cb_write_list;
+ atomic_t in_flight;
+ int version;
+ bool cb_running;
+ bool handler_running;
+};
+
+struct server_input {
+ XIO_INPUT(server);
+};
+
+XIO_TYPES(server);
+
+/* Internal interface to specific implementations.
+ * This is used for a rough separation of the strategy layer
+ * from the ordinary XIO layer.
+ * Currently, separation is at linker level.
+ * TODO: implement a dynamic separation later.
+ */
+
+/* Implemented separately, used by generic part */
+
+extern int server_thread(void *data);
+
+extern int handler_thread(void *data);
+
+extern int cb_thread(void *data);
+
+extern int server_io(struct server_brick *brick, struct xio_socket *sock, struct xio_cmd *cmd);
+
+/* Implemented by generic part, used by specific part */
+
+extern int server_switch(struct server_brick *brick);
+
+#endif
--
2.6.4
--
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