BMC/Intel-BMC/linux.git/net/ncsi, branch dev-4.6

net/ncsi: start the timer before sending the request

2016-07-12T09:55:13+00:00

Currently, the timer is armed after the request is sent. This is racy with ncsi_rcv_rsp() which discards a response to a NCSI request received before the timer was enabled. Signed-off-by: Cédric Le Goater Signed-off-by: Joel Stanley

net/ncsi: LSC AEN handler improvement

2016-06-03T20:51:49+00:00

This improves the LSC (Link Status Change) AEN handler: * The first channel with up link is choosen as active channel. * The first channel is choosen as active channel if none of channels is link up. * The active channel is always configured when its link becomes up or it's just picked as new active channel. Signed-off-by: Gavin Shan Signed-off-by: Joel Stanley

net/ncsi: Improvement for ncsi_dev_suspend()

2016-06-03T20:51:48+00:00

The function is used to deconfigure current active channel so that we can pick another available channel as active. At end of it, the all available packages and channels are purged. It's not correct. Also, the new active channel should be finalized before configuring it using ncsi_dev_config(). This improves the function from above two aspects. Signed-off-by: Gavin Shan Signed-off-by: Joel Stanley

net/ncsi: Enable AEN on active channel

2016-06-03T20:51:48+00:00

NCSI AEN packets are transmitted by far end to notify the network status change. We had the wrong assumption that the functionality is enabled in far end by default. This transmits a AEN enablement packet when configuring the active channel. Signed-off-by: Gavin Shan Signed-off-by: Joel Stanley

net/ncsi: Remove ncsi_stop_dev()

2016-06-03T20:51:47+00:00

This drops API ncsi_stop_dev() as it does nothing. Signed-off-by: Gavin Shan Signed-off-by: Joel Stanley

net/ncsi: Add NCSI_DEV_PRIV_FLAG_POPULATED

2016-06-03T20:51:47+00:00

This adds another flag (NCSI_DEV_PRIV_FLAG_POPULATED) to ncsi priv struct. When it's set, the all available packages and channels associated with the interface have been enumerated. The flag is going to be used by next patch. No functional changes introduced. Signed-off-by: Gavin Shan Signed-off-by: Joel Stanley

net/ncsi: Enumerate NCSI channels in advance

2016-06-03T20:51:46+00:00

All NCSI packages and channels are enumerated when user brings up the interface. The enumeration is heavy task and consumes lots of time. We can just do it for once when considering the fact: NCSI physical topology won't change. This enumerates NCSI packages and channels when user activates the interface for the first time, meaing the procedure won't be revisited when user reactivates the interface. The time consumed by it will be saved and the response time is improved. In order for it, we replace ncsi_dev_config() with ncsi_dev_probe() that is triggered on first call to ncsi_start_dev(). Similarly, the NCSI packages and channels are not released in ncsi_stop_dev() which is triggered when the interface is closed. It means the release is postponed until the interface is unregistered. Signed-off-by: Gavin Shan Signed-off-by: Joel Stanley

net/ncsi: Netlink support

2016-06-03T20:51:45+00:00

This adds netlink support so that userland can retrieve the NCSI topology on the specified interface. Also, more netlink commands are introduced to retrieve information from the active channel or configure the active channel with provided options. Signed-off-by: Gavin Shan

net/ncsi: Manage NCSI device

2016-06-03T20:51:45+00:00

There are multiple packages and channels connecting to NCSI enabled interface. The available packages and channels are probed with NCSI packets when NCSI device is started. Among the available packages and channels, only one channel should be selected to be active to provide service. When the active channel enters to failure state, we need choose another channel as active one to do failover. This implements the state machine to support above tasks. Also, the public interfaces are exposed for NIC driver to manage NCSI device. Signed-off-by: Gavin Shan Signed-off-by: Joel Stanley

net/ncsi: Packet handler

2016-06-03T20:51:44+00:00

NCSI packet encapsulated in ethernet frame is recognized by the ethernet protocol field (0x88F8). According to NCSI spec, the destination MAC field should be 0xFF's, but the source MAC field could be arbitrary one since channel field in NCSI header indicates the source of the packet. There are 3 types of packets depending on the type field in the NCSI packet header: command, response, Asynchronous Event Notification (AEN). The command packets are sent from NCSI enabled interace to the NCSI package or channel for purpose of information retrival or configuration. The response packets, as responses to the received command packets, originate from NCSI package or channel and terminate at NCSI enabled interface. AEN packets are sent from NCSI channel for asynchronous events that might indicate failure detected on the active channel. This implements the functions to handle NCSI packets. Signed-off-by: Gavin Shan Signed-off-by: Joel Stanley