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net: ipa: re-enable transmit in PM WQ context

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Create a new work structure in the modem private data, and use it to
re-enable the modem network device transmit queue when resuming.

This is needed by the next patch, which stops the TX queue if IPA
power isn't active when a transmit request arrives.  Packets will
start arriving the instant the TX queue is enabled, but resuming
isn't complete until ipa_modem_resume() returns.  This way we're
sure to be resumed before transmits are allowed again.

Cancel it before calling ipa_stop() in ipa_modem_stop() to ensure
the transmit queue restart completes before it gets stopped there.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alex Elder 2021-08-12 14:50:32 -05:00 committed by David S. Miller
parent b9c532c11c
commit a96e73fa12
1 changed files with 28 additions and 2 deletions
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30
drivers/net/ipa/ipa_modem.c
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@ -9,6 +9,7 @@
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/if_rmnet.h>
#include <linux/pm_runtime.h>
#include <linux/remoteproc/qcom_rproc.h>
#include "ipa.h"
@ -33,9 +34,14 @@ enum ipa_modem_state {
IPA_MODEM_STATE_STOPPING,
};
/** struct ipa_priv - IPA network device private data */
/**
* struct ipa_priv - IPA network device private data
* @ipa: IPA pointer
* @work: Work structure used to wake the modem netdev TX queue
*/
struct ipa_priv {
struct ipa *ipa;
struct work_struct work;
};
/** ipa_open() - Opens the modem network interface */
@ -189,6 +195,21 @@ void ipa_modem_suspend(struct net_device *netdev)
ipa_endpoint_suspend_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);
}
/**
* ipa_modem_wake_queue_work() - enable modem netdev queue
* @work: Work structure
*
* Re-enable transmit on the modem network device. This is called
* in (power management) work queue context, scheduled when resuming
* the modem.
*/
static void ipa_modem_wake_queue_work(struct work_struct *work)
{
struct ipa_priv *priv = container_of(work, struct ipa_priv, work);
netif_wake_queue(priv->ipa->modem_netdev);
}
/** ipa_modem_resume() - resume callback for runtime_pm
* @dev: pointer to device
*
@ -205,7 +226,8 @@ void ipa_modem_resume(struct net_device *netdev)
ipa_endpoint_resume_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);
ipa_endpoint_resume_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]);
netif_wake_queue(netdev);
/* Arrange for the TX queue to be restarted */
(void)queue_pm_work(&priv->work);
}
int ipa_modem_start(struct ipa *ipa)
@ -233,6 +255,7 @@ int ipa_modem_start(struct ipa *ipa)
SET_NETDEV_DEV(netdev, &ipa->pdev->dev);
priv = netdev_priv(netdev);
priv->ipa = ipa;
INIT_WORK(&priv->work, ipa_modem_wake_queue_work);
ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]->netdev = netdev;
ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]->netdev = netdev;
ipa->modem_netdev = netdev;
@ -277,6 +300,9 @@ int ipa_modem_stop(struct ipa *ipa)
/* Clean up the netdev and endpoints if it was started */
if (netdev) {
struct ipa_priv *priv = netdev_priv(netdev);
cancel_work_sync(&priv->work);
/* If it was opened, stop it first */
if (netdev->flags & IFF_UP)
(void)ipa_stop(netdev);