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/*
* Copyright (c) 2015-2016 Quantenna Communications, Inc.
* 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
* 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.
*
*/
#include <linux/types.h>
#include <linux/export.h>
#include <linux/slab.h>
#include "core.h"
#include "commands.h"
#include "event.h"
#include "bus.h"
#define QTNF_DEF_SYNC_CMD_TIMEOUT (5 * HZ)
int qtnf_trans_send_cmd_with_resp(struct qtnf_bus *bus, struct sk_buff *cmd_skb,
struct sk_buff **response_skb)
{
struct qtnf_cmd_ctl_node *ctl_node = &bus->trans.curr_cmd;
struct qlink_cmd *cmd = (void *)cmd_skb->data;
int ret = 0;
long status;
bool resp_not_handled = true;
struct sk_buff *resp_skb = NULL;
if (unlikely(!response_skb))
return -EFAULT;
spin_lock(&ctl_node->resp_lock);
ctl_node->seq_num++;
cmd->seq_num = cpu_to_le16(ctl_node->seq_num);
WARN(ctl_node->resp_skb, "qtnfmac: response skb not empty\n");
ctl_node->waiting_for_resp = true;
spin_unlock(&ctl_node->resp_lock);
ret = qtnf_bus_control_tx(bus, cmd_skb);
dev_kfree_skb(cmd_skb);
if (unlikely(ret))
goto out;
status = wait_for_completion_interruptible_timeout(
&ctl_node->cmd_resp_completion,
QTNF_DEF_SYNC_CMD_TIMEOUT);
spin_lock(&ctl_node->resp_lock);
resp_not_handled = ctl_node->waiting_for_resp;
resp_skb = ctl_node->resp_skb;
ctl_node->resp_skb = NULL;
ctl_node->waiting_for_resp = false;
spin_unlock(&ctl_node->resp_lock);
if (unlikely(status <= 0)) {
if (status == 0) {
ret = -ETIMEDOUT;
pr_err("response timeout\n");
} else {
ret = -EINTR;
pr_debug("interrupted\n");
}
}
if (unlikely(!resp_skb || resp_not_handled)) {
if (!ret)
ret = -EFAULT;
goto out;
}
ret = 0;
*response_skb = resp_skb;
out:
if (unlikely(resp_skb && resp_not_handled))
dev_kfree_skb(resp_skb);
return ret;
}
static void qtnf_trans_signal_cmdresp(struct qtnf_bus *bus, struct sk_buff *skb)
{
struct qtnf_cmd_ctl_node *ctl_node = &bus->trans.curr_cmd;
const struct qlink_resp *resp = (const struct qlink_resp *)skb->data;
const u16 recvd_seq_num = le16_to_cpu(resp->seq_num);
spin_lock(&ctl_node->resp_lock);
if (unlikely(!ctl_node->waiting_for_resp)) {
pr_err("unexpected response\n");
goto out_err;
}
if (unlikely(recvd_seq_num != ctl_node->seq_num)) {
pr_err("seq num mismatch\n");
goto out_err;
}
ctl_node->resp_skb = skb;
ctl_node->waiting_for_resp = false;
spin_unlock(&ctl_node->resp_lock);
complete(&ctl_node->cmd_resp_completion);
return;
out_err:
spin_unlock(&ctl_node->resp_lock);
dev_kfree_skb(skb);
}
static int qtnf_trans_event_enqueue(struct qtnf_bus *bus, struct sk_buff *skb)
{
struct qtnf_qlink_transport *trans = &bus->trans;
if (likely(skb_queue_len(&trans->event_queue) <
trans->event_queue_max_len)) {
skb_queue_tail(&trans->event_queue, skb);
queue_work(bus->workqueue, &bus->event_work);
} else {
pr_warn("event dropped due to queue overflow\n");
dev_kfree_skb(skb);
return -1;
}
return 0;
}
void qtnf_trans_init(struct qtnf_bus *bus)
{
struct qtnf_qlink_transport *trans = &bus->trans;
init_completion(&trans->curr_cmd.cmd_resp_completion);
spin_lock_init(&trans->curr_cmd.resp_lock);
spin_lock(&trans->curr_cmd.resp_lock);
trans->curr_cmd.seq_num = 0;
trans->curr_cmd.waiting_for_resp = false;
trans->curr_cmd.resp_skb = NULL;
spin_unlock(&trans->curr_cmd.resp_lock);
/* Init event handling related fields */
skb_queue_head_init(&trans->event_queue);
trans->event_queue_max_len = QTNF_MAX_EVENT_QUEUE_LEN;
}
static void qtnf_trans_free_events(struct qtnf_bus *bus)
{
struct sk_buff_head *event_queue = &bus->trans.event_queue;
struct sk_buff *current_event_skb = skb_dequeue(event_queue);
while (current_event_skb) {
dev_kfree_skb_any(current_event_skb);
current_event_skb = skb_dequeue(event_queue);
}
}
void qtnf_trans_free(struct qtnf_bus *bus)
{
if (!bus) {
pr_err("invalid bus pointer\n");
return;
}
qtnf_trans_free_events(bus);
}
int qtnf_trans_handle_rx_ctl_packet(struct qtnf_bus *bus, struct sk_buff *skb)
{
const struct qlink_msg_header *header = (void *)skb->data;
int ret = -1;
if (unlikely(skb->len < sizeof(*header))) {
pr_warn("packet is too small: %u\n", skb->len);
dev_kfree_skb(skb);
return -EINVAL;
}
if (unlikely(skb->len != le16_to_cpu(header->len))) {
pr_warn("cmd reply length mismatch: %u != %u\n",
skb->len, le16_to_cpu(header->len));
dev_kfree_skb(skb);
return -EFAULT;
}
switch (le16_to_cpu(header->type)) {
case QLINK_MSG_TYPE_CMDRSP:
if (unlikely(skb->len < sizeof(struct qlink_cmd))) {
pr_warn("cmd reply too short: %u\n", skb->len);
dev_kfree_skb(skb);
break;
}
qtnf_trans_signal_cmdresp(bus, skb);
break;
case QLINK_MSG_TYPE_EVENT:
if (unlikely(skb->len < sizeof(struct qlink_event))) {
pr_warn("event too short: %u\n", skb->len);
dev_kfree_skb(skb);
break;
}
ret = qtnf_trans_event_enqueue(bus, skb);
break;
default:
pr_warn("unknown packet type: %x\n", le16_to_cpu(header->type));
dev_kfree_skb(skb);
break;
}
return ret;
}
EXPORT_SYMBOL_GPL(qtnf_trans_handle_rx_ctl_packet);
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