/*
* Wake up the device and transmit a held SKB, then restart the net queue
*
* When the device goes into basestation-idle mode, we need to tell it
* to exit that mode; it will negotiate with the base station, user
* space may have to intervene to rehandshake crypto and then tell us
* when it is ready to transmit the packet we have "queued". Still we
* need to give it sometime after it reports being ok.
*
* On error, there is not much we can do. If the error was on TX, we
* still wake the queue up to see if the next packet will be luckier.
*
* If _cmd_exit_idle() fails...well, it could be many things; most
* commonly it is that something else took the device out of IDLE mode
* (for example, the base station). In that case we get an -EILSEQ and
* we are just going to ignore that one. If the device is back to
* connected, then fine -- if it is someother state, the packet will
* be dropped anyway.
*/
void i2400m_wake_tx_work(struct work_struct *ws)
{
int result;
struct i2400m *i2400m = container_of(ws, struct i2400m, wake_tx_ws);
struct net_device *net_dev = i2400m->wimax_dev.net_dev;
struct device *dev = i2400m_dev(i2400m);
struct sk_buff *skb;
unsigned long flags;
spin_lock_irqsave(&i2400m->tx_lock, flags);
skb = i2400m->wake_tx_skb;
i2400m->wake_tx_skb = NULL;
spin_unlock_irqrestore(&i2400m->tx_lock, flags);
d_fnstart(3, dev, "(ws %p i2400m %p skb %p)\n", ws, i2400m, skb);
result = -EINVAL;
if (skb == NULL) {
dev_err(dev, "WAKE&TX: skb disappeared!\n");
goto out_put;
}
/* If we have, somehow, lost the connection after this was
* queued, don't do anything; this might be the device got
* reset or just disconnected. */
if (unlikely(!netif_carrier_ok(net_dev)))
goto out_kfree;
result = i2400m_cmd_exit_idle(i2400m);
if (result == -EILSEQ)
result = 0;
if (result < 0) {
dev_err(dev, "WAKE&TX: device didn't get out of idle: "
"%d - resetting\n", result);
i2400m_reset(i2400m, I2400M_RT_BUS);
goto error;
}
result = wait_event_timeout(i2400m->state_wq,
i2400m->state != I2400M_SS_IDLE,
net_dev->watchdog_timeo - HZ/2);
if (result == 0)
result = -ETIMEDOUT;
if (result < 0) {
dev_err(dev, "WAKE&TX: error waiting for device to exit IDLE: "
"%d - resetting\n", result);
i2400m_reset(i2400m, I2400M_RT_BUS);
goto error;
}
msleep(20); /* device still needs some time or it drops it */
result = i2400m_tx(i2400m, skb->data, skb->len, I2400M_PT_DATA);
error:
netif_wake_queue(net_dev);
out_kfree:
kfree_skb(skb); /* refcount transferred by _hard_start_xmit() */
out_put:
i2400m_put(i2400m);
d_fnend(3, dev, "(ws %p i2400m %p skb %p) = void [%d]\n",
ws, i2400m, skb, result);
}
/*
* Wake up the device and transmit a held SKB, then restart the net queue
*
* When the device goes into basestation-idle mode, we need to tell it
* to exit that mode; it will negotiate with the base station, user
* space may have to intervene to rehandshake crypto and then tell us
* when it is ready to transmit the packet we have "queued". Still we
* need to give it sometime after it reports being ok.
*
* On error, there is not much we can do. If the error was on TX, we
* still wake the queue up to see if the next packet will be luckier.
*
* If _cmd_exit_idle() fails...well, it could be many things; most
* commonly it is that something else took the device out of IDLE mode
* (for example, the base station). In that case we get an -EILSEQ and
* we are just going to ignore that one. If the device is back to
* connected, then fine -- if it is someother state, the packet will
* be dropped anyway.
*/
void i2400m_wake_tx_work(struct work_struct *ws)
{
int result;
struct i2400m *i2400m = container_of(ws, struct i2400m, wake_tx_ws);
struct device *dev = i2400m_dev(i2400m);
struct sk_buff *skb = i2400m->wake_tx_skb;
unsigned long flags;
spin_lock_irqsave(&i2400m->tx_lock, flags);
skb = i2400m->wake_tx_skb;
i2400m->wake_tx_skb = NULL;
spin_unlock_irqrestore(&i2400m->tx_lock, flags);
d_fnstart(3, dev, "(ws %p i2400m %p skb %p)\n", ws, i2400m, skb);
result = -EINVAL;
if (skb == NULL) {
dev_err(dev, "WAKE&TX: skb dissapeared!\n");
goto out_put;
}
result = i2400m_cmd_exit_idle(i2400m);
if (result == -EILSEQ)
result = 0;
if (result < 0) {
dev_err(dev, "WAKE&TX: device didn't get out of idle: "
"%d\n", result);
goto error;
}
result = wait_event_timeout(i2400m->state_wq,
i2400m->state != I2400M_SS_IDLE, 5 * HZ);
if (result == 0)
result = -ETIMEDOUT;
if (result < 0) {
dev_err(dev, "WAKE&TX: error waiting for device to exit IDLE: "
"%d\n", result);
goto error;
}
msleep(20); /* device still needs some time or it drops it */
result = i2400m_tx(i2400m, skb->data, skb->len, I2400M_PT_DATA);
netif_wake_queue(i2400m->wimax_dev.net_dev);
error:
kfree_skb(skb); /* refcount transferred by _hard_start_xmit() */
out_put:
i2400m_put(i2400m);
d_fnend(3, dev, "(ws %p i2400m %p skb %p) = void [%d]\n",
ws, i2400m, skb, result);
}
/*
* Transmit a packet to the base station on behalf of the network stack.
*
* Returns: 0 if ok, < 0 errno code on error.
*
* We need to pull the ethernet header and add the hardware header,
* which is currently set to all zeroes and reserved.
*/
static
int i2400m_net_tx(struct i2400m *i2400m, struct net_device *net_dev,
struct sk_buff *skb)
{
int result;
struct device *dev = i2400m_dev(i2400m);
d_fnstart(3, dev, "(i2400m %p net_dev %p skb %p)\n",
i2400m, net_dev, skb);
/* FIXME: check eth hdr, only IPv4 is routed by the device as of now */
net_dev->trans_start = jiffies;
i2400m_tx_prep_header(skb);
d_printf(3, dev, "NETTX: skb %p sending %d bytes to radio\n",
skb, skb->len);
d_dump(4, dev, skb->data, skb->len);
result = i2400m_tx(i2400m, skb->data, skb->len, I2400M_PT_DATA);
d_fnend(3, dev, "(i2400m %p net_dev %p skb %p) = %d\n",
i2400m, net_dev, skb, result);
return result;
}
/**
* i2400m_msg_to_dev - Send a control message to the device and get a response
*
* @i2400m: device descriptor
*
* @msg_skb: an skb *
*
* @buf: pointer to the buffer containing the message to be sent; it
* has to start with a &struct i2400M_l3l4_hdr and then
* followed by the payload. Once this function returns, the
* buffer can be reused.
*
* @buf_len: buffer size
*
* Returns:
*
* Pointer to skb containing the ack message. You need to check the
* pointer with IS_ERR(), as it might be an error code. Error codes
* could happen because:
*
* - the message wasn't formatted correctly
* - couldn't send the message
* - failed waiting for a response
* - the ack message wasn't formatted correctly
*
* The returned skb has been allocated with wimax_msg_to_user_alloc(),
* it contains the response in a netlink attribute and is ready to be
* passed up to user space with wimax_msg_to_user_send(). To access
* the payload and its length, use wimax_msg_{data,len}() on the skb.
*
* The skb has to be freed with kfree_skb() once done.
*
* Description:
*
* This function delivers a message/command to the device and waits
* for an ack to be received. The format is described in
* linux/wimax/i2400m.h. In summary, a command/get/set is followed by an
* ack.
*
* This function will not check the ack status, that's left up to the
* caller. Once done with the ack skb, it has to be kfree_skb()ed.
*
* The i2400m handles only one message at the same time, thus we need
* the mutex to exclude other players.
*
* We write the message and then wait for an answer to come back. The
* RX path intercepts control messages and handles them in
* i2400m_rx_ctl(). Reports (notifications) are (maybe) processed
* locally and then forwarded (as needed) to user space on the WiMAX
* stack message pipe. Acks are saved and passed back to us through an
* skb in i2400m->ack_skb which is ready to be given to generic
* netlink if need be.
*/
struct sk_buff *i2400m_msg_to_dev(struct i2400m *i2400m,
const void *buf, size_t buf_len)
{
int result;
struct device *dev = i2400m_dev(i2400m);
const struct i2400m_l3l4_hdr *msg_l3l4_hdr;
struct sk_buff *ack_skb;
const struct i2400m_l3l4_hdr *ack_l3l4_hdr;
size_t ack_len;
int ack_timeout;
unsigned msg_type;
unsigned long flags;
d_fnstart(3, dev, "(i2400m %p buf %p len %zu)\n",
i2400m, buf, buf_len);
rmb(); /* Make sure we see what i2400m_dev_reset_handle() */
if (i2400m->boot_mode)
return ERR_PTR(-EL3RST);
msg_l3l4_hdr = buf;
/* Check msg & payload consistency */
result = i2400m_msg_size_check(i2400m, msg_l3l4_hdr, buf_len);
if (result < 0)
goto error_bad_msg;
msg_type = le16_to_cpu(msg_l3l4_hdr->type);
d_printf(1, dev, "CMD/GET/SET 0x%04x %zu bytes\n",
msg_type, buf_len);
d_dump(2, dev, buf, buf_len);
/* Setup the completion, ack_skb ("we are waiting") and send
* the message to the device */
mutex_lock(&i2400m->msg_mutex);
spin_lock_irqsave(&i2400m->rx_lock, flags);
i2400m->ack_skb = ERR_PTR(-EINPROGRESS);
spin_unlock_irqrestore(&i2400m->rx_lock, flags);
init_completion(&i2400m->msg_completion);
result = i2400m_tx(i2400m, buf, buf_len, I2400M_PT_CTRL);
if (result < 0) {
dev_err(dev, "can't send message 0x%04x: %d\n",
le16_to_cpu(msg_l3l4_hdr->type), result);
goto error_tx;
}
/* Some commands take longer to execute because of crypto ops,
* so we give them some more leeway on timeout */
switch (msg_type) {
case I2400M_MT_GET_TLS_OPERATION_RESULT:
case I2400M_MT_CMD_SEND_EAP_RESPONSE:
ack_timeout = 5 * HZ;
break;
default:
ack_timeout = HZ;
}
if (unlikely(i2400m->trace_msg_from_user))
wimax_msg(&i2400m->wimax_dev, "echo", buf, buf_len, GFP_KERNEL);
/* The RX path in rx.c will put any response for this message
* in i2400m->ack_skb and wake us up. If we cancel the wait,
* we need to change the value of i2400m->ack_skb to something
* not -EINPROGRESS so RX knows there is no one waiting. */
result = wait_for_completion_interruptible_timeout(
&i2400m->msg_completion, ack_timeout);
if (result == 0) {
dev_err(dev, "timeout waiting for reply to message 0x%04x\n",
msg_type);
result = -ETIMEDOUT;
i2400m_msg_to_dev_cancel_wait(i2400m, result);
goto error_wait_for_completion;
} else if (result < 0) {
dev_err(dev, "error waiting for reply to message 0x%04x: %d\n",
msg_type, result);
i2400m_msg_to_dev_cancel_wait(i2400m, result);
goto error_wait_for_completion;
}
/* Pull out the ack data from i2400m->ack_skb -- see if it is
* an error and act accordingly */
spin_lock_irqsave(&i2400m->rx_lock, flags);
ack_skb = i2400m->ack_skb;
if (IS_ERR(ack_skb))
result = PTR_ERR(ack_skb);
else
result = 0;
i2400m->ack_skb = NULL;
spin_unlock_irqrestore(&i2400m->rx_lock, flags);
if (result < 0)
goto error_ack_status;
ack_l3l4_hdr = wimax_msg_data_len(ack_skb, &ack_len);
/* Check the ack and deliver it if it is ok */
if (unlikely(i2400m->trace_msg_from_user))
wimax_msg(&i2400m->wimax_dev, "echo",
ack_l3l4_hdr, ack_len, GFP_KERNEL);
result = i2400m_msg_size_check(i2400m, ack_l3l4_hdr, ack_len);
if (result < 0) {
dev_err(dev, "HW BUG? reply to message 0x%04x: %d\n",
msg_type, result);
goto error_bad_ack_len;
}
if (msg_type != le16_to_cpu(ack_l3l4_hdr->type)) {
dev_err(dev, "HW BUG? bad reply 0x%04x to message 0x%04x\n",
le16_to_cpu(ack_l3l4_hdr->type), msg_type);
result = -EIO;
goto error_bad_ack_type;
}
i2400m_msg_ack_hook(i2400m, ack_l3l4_hdr, ack_len);
mutex_unlock(&i2400m->msg_mutex);
d_fnend(3, dev, "(i2400m %p buf %p len %zu) = %p\n",
i2400m, buf, buf_len, ack_skb);
return ack_skb;
error_bad_ack_type:
error_bad_ack_len:
kfree_skb(ack_skb);
error_ack_status:
error_wait_for_completion:
error_tx:
mutex_unlock(&i2400m->msg_mutex);
error_bad_msg:
d_fnend(3, dev, "(i2400m %p buf %p len %zu) = %d\n",
i2400m, buf, buf_len, result);
return ERR_PTR(result);
}
struct sk_buff *i2400m_msg_to_dev(struct i2400m *i2400m,
const void *buf, size_t buf_len)
{
int result;
struct device *dev = i2400m_dev(i2400m);
const struct i2400m_l3l4_hdr *msg_l3l4_hdr;
struct sk_buff *ack_skb;
const struct i2400m_l3l4_hdr *ack_l3l4_hdr;
size_t ack_len;
int ack_timeout;
unsigned msg_type;
unsigned long flags;
d_fnstart(3, dev, "(i2400m %p buf %p len %zu)\n",
i2400m, buf, buf_len);
rmb();
if (i2400m->boot_mode)
return ERR_PTR(-EL3RST);
msg_l3l4_hdr = buf;
result = i2400m_msg_size_check(i2400m, msg_l3l4_hdr, buf_len);
if (result < 0)
goto error_bad_msg;
msg_type = le16_to_cpu(msg_l3l4_hdr->type);
d_printf(1, dev, "CMD/GET/SET 0x%04x %zu bytes\n",
msg_type, buf_len);
d_dump(2, dev, buf, buf_len);
mutex_lock(&i2400m->msg_mutex);
spin_lock_irqsave(&i2400m->rx_lock, flags);
i2400m->ack_skb = ERR_PTR(-EINPROGRESS);
spin_unlock_irqrestore(&i2400m->rx_lock, flags);
init_completion(&i2400m->msg_completion);
result = i2400m_tx(i2400m, buf, buf_len, I2400M_PT_CTRL);
if (result < 0) {
dev_err(dev, "can't send message 0x%04x: %d\n",
le16_to_cpu(msg_l3l4_hdr->type), result);
goto error_tx;
}
switch (msg_type) {
case I2400M_MT_GET_TLS_OPERATION_RESULT:
case I2400M_MT_CMD_SEND_EAP_RESPONSE:
ack_timeout = 5 * HZ;
break;
default:
ack_timeout = HZ;
}
if (unlikely(i2400m->trace_msg_from_user))
wimax_msg(&i2400m->wimax_dev, "echo", buf, buf_len, GFP_KERNEL);
result = wait_for_completion_interruptible_timeout(
&i2400m->msg_completion, ack_timeout);
if (result == 0) {
dev_err(dev, "timeout waiting for reply to message 0x%04x\n",
msg_type);
result = -ETIMEDOUT;
i2400m_msg_to_dev_cancel_wait(i2400m, result);
goto error_wait_for_completion;
} else if (result < 0) {
dev_err(dev, "error waiting for reply to message 0x%04x: %d\n",
msg_type, result);
i2400m_msg_to_dev_cancel_wait(i2400m, result);
goto error_wait_for_completion;
}
spin_lock_irqsave(&i2400m->rx_lock, flags);
ack_skb = i2400m->ack_skb;
if (IS_ERR(ack_skb))
result = PTR_ERR(ack_skb);
else
result = 0;
i2400m->ack_skb = NULL;
spin_unlock_irqrestore(&i2400m->rx_lock, flags);
if (result < 0)
goto error_ack_status;
ack_l3l4_hdr = wimax_msg_data_len(ack_skb, &ack_len);
if (unlikely(i2400m->trace_msg_from_user))
wimax_msg(&i2400m->wimax_dev, "echo",
ack_l3l4_hdr, ack_len, GFP_KERNEL);
result = i2400m_msg_size_check(i2400m, ack_l3l4_hdr, ack_len);
if (result < 0) {
dev_err(dev, "HW BUG? reply to message 0x%04x: %d\n",
msg_type, result);
goto error_bad_ack_len;
}
if (msg_type != le16_to_cpu(ack_l3l4_hdr->type)) {
dev_err(dev, "HW BUG? bad reply 0x%04x to message 0x%04x\n",
le16_to_cpu(ack_l3l4_hdr->type), msg_type);
result = -EIO;
goto error_bad_ack_type;
}
i2400m_msg_ack_hook(i2400m, ack_l3l4_hdr, ack_len);
mutex_unlock(&i2400m->msg_mutex);
d_fnend(3, dev, "(i2400m %p buf %p len %zu) = %p\n",
i2400m, buf, buf_len, ack_skb);
return ack_skb;
error_bad_ack_type:
error_bad_ack_len:
kfree_skb(ack_skb);
error_ack_status:
error_wait_for_completion:
error_tx:
mutex_unlock(&i2400m->msg_mutex);
error_bad_msg:
d_fnend(3, dev, "(i2400m %p buf %p len %zu) = %d\n",
i2400m, buf, buf_len, result);
return ERR_PTR(result);
}