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/* Copyright (c) 2019-2020 The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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.
*
* RMNET Data Smart Hash Workqueue Generic Netlink Functions
*
*/
#include "rmnet_shs_wq_genl.h"
#include <net/sock.h>
#include <linux/skbuff.h>
MODULE_LICENSE("GPL v2");
static struct net *last_net;
static u32 last_snd_portid;
uint32_t rmnet_shs_genl_seqnum;
int rmnet_shs_userspace_connected;
/* Static Functions and Definitions */
static struct nla_policy rmnet_shs_genl_attr_policy[RMNET_SHS_GENL_ATTR_MAX + 1] = {
[RMNET_SHS_GENL_ATTR_INT] = { .type = NLA_S32 },
[RMNET_SHS_GENL_ATTR_SUGG] = { .len = sizeof(struct rmnet_shs_wq_sugg_info) },
[RMNET_SHS_GENL_ATTR_SEG] = { .len = sizeof(struct rmnet_shs_wq_seg_info) },
[RMNET_SHS_GENL_ATTR_STR] = { .type = NLA_NUL_STRING },
};
#define RMNET_SHS_GENL_OP(_cmd, _func) \
{ \
.cmd = _cmd, \
.policy = rmnet_shs_genl_attr_policy, \
.doit = _func, \
.dumpit = NULL, \
.flags = 0, \
}
static const struct genl_ops rmnet_shs_genl_ops[] = {
RMNET_SHS_GENL_OP(RMNET_SHS_GENL_CMD_INIT_DMA,
rmnet_shs_genl_dma_init),
RMNET_SHS_GENL_OP(RMNET_SHS_GENL_CMD_TRY_TO_MOVE_FLOW,
rmnet_shs_genl_try_to_move_flow),
RMNET_SHS_GENL_OP(RMNET_SHS_GENL_CMD_SET_FLOW_SEGMENTATION,
rmnet_shs_genl_set_flow_segmentation),
RMNET_SHS_GENL_OP(RMNET_SHS_GENL_CMD_MEM_SYNC,
rmnet_shs_genl_mem_sync),
};
struct genl_family rmnet_shs_genl_family = {
.hdrsize = 0,
.name = RMNET_SHS_GENL_FAMILY_NAME,
.version = RMNET_SHS_GENL_VERSION,
.maxattr = RMNET_SHS_GENL_ATTR_MAX,
.ops = rmnet_shs_genl_ops,
.n_ops = ARRAY_SIZE(rmnet_shs_genl_ops),
};
int rmnet_shs_genl_send_int_to_userspace(struct genl_info *info, int val)
{
struct sk_buff *skb;
void *msg_head;
int rc;
skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
if (skb == NULL)
goto out;
msg_head = genlmsg_put(skb, 0, info->snd_seq+1, &rmnet_shs_genl_family,
0, RMNET_SHS_GENL_CMD_INIT_DMA);
if (msg_head == NULL) {
rc = -ENOMEM;
goto out;
}
rc = nla_put_u32(skb, RMNET_SHS_GENL_ATTR_INT, val);
if (rc != 0)
goto out;
genlmsg_end(skb, msg_head);
rc = genlmsg_unicast(genl_info_net(info), skb, info->snd_portid);
if (rc != 0)
goto out;
rm_err("SHS_GNL: Successfully sent int %d\n", val);
return 0;
out:
/* TODO: Need to free skb?? */
rm_err("SHS_GNL: FAILED to send int %d\n", val);
return -1;
}
int rmnet_shs_genl_send_int_to_userspace_no_info(int val)
{
struct sk_buff *skb;
void *msg_head;
int rc;
if (last_net == NULL) {
rm_err("SHS_GNL: FAILED to send int %d - last_net is NULL\n",
val);
return -1;
}
skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
if (skb == NULL)
goto out;
msg_head = genlmsg_put(skb, 0, rmnet_shs_genl_seqnum++, &rmnet_shs_genl_family,
0, RMNET_SHS_GENL_CMD_INIT_DMA);
if (msg_head == NULL) {
rc = -ENOMEM;
goto out;
}
rc = nla_put_u32(skb, RMNET_SHS_GENL_ATTR_INT, val);
if (rc != 0)
goto out;
genlmsg_end(skb, msg_head);
rc = genlmsg_unicast(last_net, skb, last_snd_portid);
if (rc != 0)
goto out;
rm_err("SHS_GNL: Successfully sent int %d\n", val);
return 0;
out:
/* TODO: Need to free skb?? */
rm_err("SHS_GNL: FAILED to send int %d\n", val);
rmnet_shs_userspace_connected = 0;
return -1;
}
int rmnet_shs_genl_send_msg_to_userspace(void)
{
struct sk_buff *skb;
void *msg_head;
int rc;
int val = rmnet_shs_genl_seqnum++;
rm_err("SHS_GNL: Trying to send msg %d\n", val);
skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
if (skb == NULL)
goto out;
msg_head = genlmsg_put(skb, 0, rmnet_shs_genl_seqnum++, &rmnet_shs_genl_family,
0, RMNET_SHS_GENL_CMD_INIT_DMA);
if (msg_head == NULL) {
rc = -ENOMEM;
goto out;
}
rc = nla_put_u32(skb, RMNET_SHS_GENL_ATTR_INT, val);
if (rc != 0)
goto out;
genlmsg_end(skb, msg_head);
genlmsg_multicast(&rmnet_shs_genl_family, skb, 0, 0, GFP_ATOMIC);
rm_err("SHS_GNL: Successfully sent int %d\n", val);
return 0;
out:
/* TODO: Need to free skb?? */
rm_err("SHS_GNL: FAILED to send int %d\n", val);
rmnet_shs_userspace_connected = 0;
return -1;
}
/* Currently unused - handles message from userspace to initialize the shared memory,
* memory is inited by kernel wq automatically
*/
int rmnet_shs_genl_dma_init(struct sk_buff *skb_2, struct genl_info *info)
{
rm_err("%s", "SHS_GNL: rmnet_shs_genl_dma_init");
if (info == NULL) {
rm_err("%s", "SHS_GNL: an error occured - info is null");
return -1;
}
return 0;
}
int rmnet_shs_genl_set_flow_segmentation(struct sk_buff *skb_2, struct genl_info *info)
{
struct nlattr *na;
struct rmnet_shs_wq_seg_info seg_info;
int rc = 0;
rm_err("%s", "SHS_GNL: rmnet_shs_genl_set_flow_segmentation");
if (info == NULL) {
rm_err("%s", "SHS_GNL: an error occured - info is null");
return -1;
}
na = info->attrs[RMNET_SHS_GENL_ATTR_SEG];
if (na) {
if (nla_memcpy(&seg_info, na, sizeof(seg_info)) > 0) {
rm_err("SHS_GNL: recv segmentation req "
"hash_to_set = 0x%x segment_enable = %u",
seg_info.hash_to_set,
seg_info.segment_enable);
rc = rmnet_shs_wq_set_flow_segmentation(seg_info.hash_to_set,
seg_info.segment_enable);
if (rc == 1) {
rmnet_shs_genl_send_int_to_userspace(info, 0);
trace_rmnet_shs_wq_high(RMNET_SHS_WQ_SHSUSR,
RMNET_SHS_WQ_FLOW_SEG_SET_PASS,
seg_info.hash_to_set, seg_info.segment_enable,
0xDEF, 0xDEF, NULL, NULL);
} else {
rmnet_shs_genl_send_int_to_userspace(info, -1);
trace_rmnet_shs_wq_high(RMNET_SHS_WQ_SHSUSR,
RMNET_SHS_WQ_FLOW_SEG_SET_FAIL,
seg_info.hash_to_set, seg_info.segment_enable,
0xDEF, 0xDEF, NULL, NULL);
return 0;
}
} else {
rm_err("SHS_GNL: nla_memcpy failed %d\n",
RMNET_SHS_GENL_ATTR_SEG);
rmnet_shs_genl_send_int_to_userspace(info, -1);
return 0;
}
} else {
rm_err("SHS_GNL: no info->attrs %d\n",
RMNET_SHS_GENL_ATTR_SEG);
rmnet_shs_genl_send_int_to_userspace(info, -1);
return 0;
}
return 0;
}
int rmnet_shs_genl_try_to_move_flow(struct sk_buff *skb_2, struct genl_info *info)
{
struct nlattr *na;
struct rmnet_shs_wq_sugg_info sugg_info;
int rc = 0;
rm_err("%s", "SHS_GNL: rmnet_shs_genl_try_to_move_flow");
if (info == NULL) {
rm_err("%s", "SHS_GNL: an error occured - info is null");
return -1;
}
na = info->attrs[RMNET_SHS_GENL_ATTR_SUGG];
if (na) {
if (nla_memcpy(&sugg_info, na, sizeof(sugg_info)) > 0) {
rm_err("SHS_GNL: cur_cpu =%u dest_cpu = %u "
"hash_to_move = 0x%x sugg_type = %u",
sugg_info.cur_cpu,
sugg_info.dest_cpu,
sugg_info.hash_to_move,
sugg_info.sugg_type);
rc = rmnet_shs_wq_try_to_move_flow(sugg_info.cur_cpu,
sugg_info.dest_cpu,
sugg_info.hash_to_move,
sugg_info.sugg_type);
if (rc == 1) {
rmnet_shs_genl_send_int_to_userspace(info, 0);
trace_rmnet_shs_wq_high(RMNET_SHS_WQ_SHSUSR, RMNET_SHS_WQ_TRY_PASS,
sugg_info.cur_cpu, sugg_info.dest_cpu,
sugg_info.hash_to_move, sugg_info.sugg_type, NULL, NULL);
} else {
rmnet_shs_genl_send_int_to_userspace(info, -1);
trace_rmnet_shs_wq_high(RMNET_SHS_WQ_SHSUSR, RMNET_SHS_WQ_TRY_FAIL,
sugg_info.cur_cpu, sugg_info.dest_cpu,
sugg_info.hash_to_move, sugg_info.sugg_type, NULL, NULL);
return 0;
}
} else {
rm_err("SHS_GNL: nla_memcpy failed %d\n",
RMNET_SHS_GENL_ATTR_SUGG);
rmnet_shs_genl_send_int_to_userspace(info, -1);
return 0;
}
} else {
rm_err("SHS_GNL: no info->attrs %d\n",
RMNET_SHS_GENL_ATTR_SUGG);
rmnet_shs_genl_send_int_to_userspace(info, -1);
return 0;
}
return 0;
}
int rmnet_shs_genl_mem_sync(struct sk_buff *skb_2, struct genl_info *info)
{
rm_err("%s", "SHS_GNL: rmnet_shs_genl_mem_sync");
if (!rmnet_shs_userspace_connected)
rmnet_shs_userspace_connected = 1;
/* Todo: detect when userspace is disconnected. If we dont get
* a sync message in the next 2 wq ticks, we got disconnected
*/
trace_rmnet_shs_wq_high(RMNET_SHS_WQ_SHSUSR, RMNET_SHS_WQ_SHSUSR_SYNC_START,
0xDEF, 0xDEF, 0xDEF, 0xDEF, NULL, NULL);
if (info == NULL) {
rm_err("%s", "SHS_GNL: an error occured - info is null");
return -1;
}
last_net = genl_info_net(info);
last_snd_portid = info->snd_portid;
return 0;
}
/* register new generic netlink family */
int rmnet_shs_wq_genl_init(void)
{
int ret;
rmnet_shs_userspace_connected = 0;
ret = genl_register_family(&rmnet_shs_genl_family);
if (ret != 0) {
rm_err("SHS_GNL: register family failed: %i", ret);
genl_unregister_family(&rmnet_shs_genl_family);
return -1;
}
rm_err("SHS_GNL: successfully registered generic netlink familiy: %s",
RMNET_SHS_GENL_FAMILY_NAME);
return 0;
}
/* Unregister the generic netlink family */
int rmnet_shs_wq_genl_deinit(void)
{
int ret;
rmnet_shs_genl_send_int_to_userspace_no_info(RMNET_SHS_SYNC_WQ_EXIT);
ret = genl_unregister_family(&rmnet_shs_genl_family);
if(ret != 0){
rm_err("SHS_GNL: unregister family failed: %i\n",ret);
}
rmnet_shs_userspace_connected = 0;
return 0;
}
|
