net: Add preliminaly support for suspending/resuming a net interface
Such state needs to be set _from_ the PM API functions and not the other way round. So if a network device driver does not support such API, it will not be able to set the core net_if on PM state, obviously. Currently, these functions only set/unset NET_IF_SUSPENDED flag. More logic will be added later, to decide whether the net_if can be actually set to suspend mode or not and also to take care of all timers related to the interface. Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
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3 changed files with 62 additions and 1 deletions
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@ -194,6 +194,9 @@ enum net_if_flag {
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*/
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NET_IF_NO_AUTO_START,
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/** Power management specific: interface is being suspended */
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NET_IF_SUSPENDED,
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/** @cond INTERNAL_HIDDEN */
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/* Total number of flags - must be at the end of the enum */
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NET_IF_NUM_FLAGS
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@ -2129,6 +2132,28 @@ static inline bool net_if_are_pending_tx_packets(struct net_if *iface)
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#endif
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}
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#ifdef CONFIG_NET_POWER_MANAGEMENT
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/**
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* @brief Suspend a network interface from a power management perspective
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*
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* @param iface Pointer to network interface
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*
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* @return 0 on success, or -EALREADY/-EBUSY as possible errors.
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*/
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int net_if_suspend(struct net_if *iface);
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/**
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* @brief Resume a network interface from a power management perspective
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*
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* @param iface Pointer to network interface
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*
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* @return 0 on success, or -EALREADY as a possible error.
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*/
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int net_if_resume(struct net_if *iface);
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#endif /* CONFIG_NET_POWER_MANAGEMENT */
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/** @cond INTERNAL_HIDDEN */
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struct net_if_api {
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void (*init)(struct net_if *iface);
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@ -73,6 +73,13 @@ config NETWORKING
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if NETWORKING
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# Such option should not be configured manually but by device drivers
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# which supports PM properly.
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config NET_POWER_MANAGEMENT
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bool
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default n
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depends on DEVICE_POWER_MANAGEMENT
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source "subsys/net/Kconfig.hostname"
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source "subsys/net/l2/Kconfig"
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@ -347,7 +347,8 @@ enum net_verdict net_if_send_data(struct net_if *iface, struct net_pkt *pkt)
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enum net_verdict verdict = NET_OK;
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int status = -EIO;
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if (!net_if_flag_is_set(iface, NET_IF_UP)) {
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if (!net_if_flag_is_set(iface, NET_IF_UP) ||
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net_if_flag_is_set(iface, NET_IF_SUSPENDED)) {
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/* Drop packet if interface is not up */
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NET_WARN("iface %p is down", iface);
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verdict = NET_DROP;
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@ -3623,6 +3624,34 @@ bool net_if_is_promisc(struct net_if *iface)
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return net_if_flag_is_set(iface, NET_IF_PROMISC);
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}
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#ifdef CONFIG_NET_POWER_MANAGEMENT
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int net_if_suspend(struct net_if *iface)
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{
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if (net_if_are_pending_tx_packets(iface)) {
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return -EBUSY;
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}
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if (net_if_flag_test_and_set(iface, NET_IF_SUSPENDED)) {
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return -EALREADY;
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}
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return 0;
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}
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int net_if_resume(struct net_if *iface)
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{
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if (!net_if_flag_is_set(iface, NET_IF_SUSPENDED)) {
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return -EALREADY;
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}
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net_if_flag_clear(iface, NET_IF_SUSPENDED);
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return 0;
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}
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#endif /* CONFIG_NET_POWER_MANAGEMENT */
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#if defined(CONFIG_NET_PKT_TIMESTAMP_THREAD)
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static void net_tx_ts_thread(void)
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{
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