Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 | /*
* 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);
|