net/ncsi: Resource management
NCSI spec (DSP0222) defines several objects: package, channel, mode,
filter, version and statistics etc. This introduces the data structs
to represent those objects and implement functions to manage them.
Also, this introduces CONFIG_NET_NCSI for the newly implemented NCSI
stack.
* The user (e.g. netdev driver) dereference NCSI device by
"struct ncsi_dev", which is embedded to "struct ncsi_dev_priv".
The later one is used by NCSI stack internally.
* Every NCSI device can have multiple packages simultaneously, up
to 8 packages. It's represented by "struct ncsi_package" and
identified by 3-bits ID.
* Every NCSI package can have multiple channels, up to 32. It's
represented by "struct ncsi_channel" and identified by 5-bits ID.
* Every NCSI channel has version, statistics, various modes and
filters. They are represented by "struct ncsi_channel_version",
"struct ncsi_channel_stats", "struct ncsi_channel_mode" and
"struct ncsi_channel_filter" separately.
* Apart from AEN (Asynchronous Event Notification), the NCSI stack
works in terms of command and response. This introduces "struct
ncsi_req" to represent a complete NCSI transaction made of NCSI
request and response.
link: https://www.dmtf.org/sites/default/files/standards/documents/DSP0222_1.1.0.pdf
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Acked-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
steinar/wifi_calib_4_9_kernel
Gavin Shan
David S. Miller
parent
5e31c7019f
commit
2d283bdd07
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@ -0,0 +1,46 @@
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#ifndef __NET_NCSI_H
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#define __NET_NCSI_H
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/*
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* The NCSI device states seen from external. More NCSI device states are
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* only visible internally (in net/ncsi/internal.h). When the NCSI device
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* is registered, it's in ncsi_dev_state_registered state. The state
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* ncsi_dev_state_start is used to drive to choose active package and
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* channel. After that, its state is changed to ncsi_dev_state_functional.
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*
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* The state ncsi_dev_state_stop helps to shut down the currently active
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* package and channel while ncsi_dev_state_config helps to reconfigure
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* them.
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*/
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enum {
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ncsi_dev_state_registered = 0x0000,
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ncsi_dev_state_functional = 0x0100,
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ncsi_dev_state_probe = 0x0200,
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ncsi_dev_state_config = 0x0300,
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ncsi_dev_state_suspend = 0x0400,
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};
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struct ncsi_dev {
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int state;
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int link_up;
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struct net_device *dev;
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void (*handler)(struct ncsi_dev *ndev);
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};
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#ifdef CONFIG_NET_NCSI
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struct ncsi_dev *ncsi_register_dev(struct net_device *dev,
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void (*notifier)(struct ncsi_dev *nd));
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void ncsi_unregister_dev(struct ncsi_dev *nd);
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#else /* !CONFIG_NET_NCSI */
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static inline struct ncsi_dev *ncsi_register_dev(struct net_device *dev,
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void (*notifier)(struct ncsi_dev *nd))
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{
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return NULL;
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}
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static inline void ncsi_unregister_dev(struct ncsi_dev *nd)
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{
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}
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#endif /* CONFIG_NET_NCSI */
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#endif /* __NET_NCSI_H */
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@ -237,6 +237,7 @@ source "net/hsr/Kconfig"
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source "net/switchdev/Kconfig"
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source "net/l3mdev/Kconfig"
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source "net/qrtr/Kconfig"
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source "net/ncsi/Kconfig"
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config RPS
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bool
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@ -79,3 +79,4 @@ ifneq ($(CONFIG_NET_L3_MASTER_DEV),)
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obj-y += l3mdev/
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endif
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obj-$(CONFIG_QRTR) += qrtr/
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obj-$(CONFIG_NET_NCSI) += ncsi/
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#
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# Configuration for NCSI support
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#
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config NET_NCSI
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bool "NCSI interface support"
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depends on INET
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---help---
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This module provides NCSI (Network Controller Sideband Interface)
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support. Enable this only if your system connects to a network
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device via NCSI and the ethernet driver you're using supports
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the protocol explicitly.
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@ -0,0 +1,4 @@
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#
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# Makefile for NCSI API
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#
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obj-$(CONFIG_NET_NCSI) += ncsi-manage.o
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@ -0,0 +1,256 @@
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/*
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* Copyright Gavin Shan, IBM Corporation 2016.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef __NCSI_INTERNAL_H__
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#define __NCSI_INTERNAL_H__
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enum {
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NCSI_CAP_BASE = 0,
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NCSI_CAP_GENERIC = 0,
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NCSI_CAP_BC,
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NCSI_CAP_MC,
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NCSI_CAP_BUFFER,
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NCSI_CAP_AEN,
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NCSI_CAP_VLAN,
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NCSI_CAP_MAX
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};
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enum {
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NCSI_CAP_GENERIC_HWA = 0x01, /* HW arbitration */
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NCSI_CAP_GENERIC_HDS = 0x02, /* HNC driver status change */
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NCSI_CAP_GENERIC_FC = 0x04, /* HNC to MC flow control */
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NCSI_CAP_GENERIC_FC1 = 0x08, /* MC to HNC flow control */
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NCSI_CAP_GENERIC_MC = 0x10, /* Global MC filtering */
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NCSI_CAP_GENERIC_HWA_UNKNOWN = 0x00, /* Unknown HW arbitration */
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NCSI_CAP_GENERIC_HWA_SUPPORT = 0x20, /* Supported HW arbitration */
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NCSI_CAP_GENERIC_HWA_NOT_SUPPORT = 0x40, /* No HW arbitration */
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NCSI_CAP_GENERIC_HWA_RESERVED = 0x60, /* Reserved HW arbitration */
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NCSI_CAP_GENERIC_HWA_MASK = 0x60, /* Mask for HW arbitration */
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NCSI_CAP_GENERIC_MASK = 0x7f,
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NCSI_CAP_BC_ARP = 0x01, /* ARP packet filtering */
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NCSI_CAP_BC_DHCPC = 0x02, /* DHCP client filtering */
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NCSI_CAP_BC_DHCPS = 0x04, /* DHCP server filtering */
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NCSI_CAP_BC_NETBIOS = 0x08, /* NetBIOS packet filtering */
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NCSI_CAP_BC_MASK = 0x0f,
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NCSI_CAP_MC_IPV6_NEIGHBOR = 0x01, /* IPv6 neighbor filtering */
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NCSI_CAP_MC_IPV6_ROUTER = 0x02, /* IPv6 router filering */
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NCSI_CAP_MC_DHCPV6_RELAY = 0x04, /* DHCPv6 relay / server MC */
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NCSI_CAP_MC_DHCPV6_WELL_KNOWN = 0x08, /* DHCPv6 well-known MC */
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NCSI_CAP_MC_IPV6_MLD = 0x10, /* IPv6 MLD filtering */
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NCSI_CAP_MC_IPV6_NEIGHBOR_S = 0x20, /* IPv6 neighbour filtering */
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NCSI_CAP_MC_MASK = 0x3f,
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NCSI_CAP_AEN_LSC = 0x01, /* Link status change */
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NCSI_CAP_AEN_CR = 0x02, /* Configuration required */
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NCSI_CAP_AEN_HDS = 0x04, /* HNC driver status */
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NCSI_CAP_AEN_MASK = 0x07,
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NCSI_CAP_VLAN_ONLY = 0x01, /* Filter VLAN packet only */
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NCSI_CAP_VLAN_NO = 0x02, /* Filter VLAN and non-VLAN */
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NCSI_CAP_VLAN_ANY = 0x04, /* Filter Any-and-non-VLAN */
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NCSI_CAP_VLAN_MASK = 0x07
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};
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enum {
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NCSI_MODE_BASE = 0,
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NCSI_MODE_ENABLE = 0,
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NCSI_MODE_TX_ENABLE,
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NCSI_MODE_LINK,
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NCSI_MODE_VLAN,
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NCSI_MODE_BC,
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NCSI_MODE_MC,
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NCSI_MODE_AEN,
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NCSI_MODE_FC,
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NCSI_MODE_MAX
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};
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enum {
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NCSI_FILTER_BASE = 0,
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NCSI_FILTER_VLAN = 0,
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NCSI_FILTER_UC,
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NCSI_FILTER_MC,
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NCSI_FILTER_MIXED,
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NCSI_FILTER_MAX
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};
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struct ncsi_channel_version {
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u32 version; /* Supported BCD encoded NCSI version */
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u32 alpha2; /* Supported BCD encoded NCSI version */
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u8 fw_name[12]; /* Firware name string */
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u32 fw_version; /* Firmware version */
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u16 pci_ids[4]; /* PCI identification */
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u32 mf_id; /* Manufacture ID */
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};
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struct ncsi_channel_cap {
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u32 index; /* Index of channel capabilities */
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u32 cap; /* NCSI channel capability */
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};
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struct ncsi_channel_mode {
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u32 index; /* Index of channel modes */
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u32 enable; /* Enabled or disabled */
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u32 size; /* Valid entries in ncm_data[] */
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u32 data[8]; /* Data entries */
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};
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struct ncsi_channel_filter {
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u32 index; /* Index of channel filters */
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u32 total; /* Total entries in the filter table */
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u64 bitmap; /* Bitmap of valid entries */
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u32 data[]; /* Data for the valid entries */
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};
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struct ncsi_channel_stats {
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u32 hnc_cnt_hi; /* Counter cleared */
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u32 hnc_cnt_lo; /* Counter cleared */
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u32 hnc_rx_bytes; /* Rx bytes */
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u32 hnc_tx_bytes; /* Tx bytes */
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u32 hnc_rx_uc_pkts; /* Rx UC packets */
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u32 hnc_rx_mc_pkts; /* Rx MC packets */
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u32 hnc_rx_bc_pkts; /* Rx BC packets */
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u32 hnc_tx_uc_pkts; /* Tx UC packets */
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u32 hnc_tx_mc_pkts; /* Tx MC packets */
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u32 hnc_tx_bc_pkts; /* Tx BC packets */
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u32 hnc_fcs_err; /* FCS errors */
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u32 hnc_align_err; /* Alignment errors */
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u32 hnc_false_carrier; /* False carrier detection */
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u32 hnc_runt_pkts; /* Rx runt packets */
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u32 hnc_jabber_pkts; /* Rx jabber packets */
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u32 hnc_rx_pause_xon; /* Rx pause XON frames */
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u32 hnc_rx_pause_xoff; /* Rx XOFF frames */
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u32 hnc_tx_pause_xon; /* Tx XON frames */
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u32 hnc_tx_pause_xoff; /* Tx XOFF frames */
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u32 hnc_tx_s_collision; /* Single collision frames */
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u32 hnc_tx_m_collision; /* Multiple collision frames */
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u32 hnc_l_collision; /* Late collision frames */
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u32 hnc_e_collision; /* Excessive collision frames */
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u32 hnc_rx_ctl_frames; /* Rx control frames */
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u32 hnc_rx_64_frames; /* Rx 64-bytes frames */
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u32 hnc_rx_127_frames; /* Rx 65-127 bytes frames */
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u32 hnc_rx_255_frames; /* Rx 128-255 bytes frames */
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u32 hnc_rx_511_frames; /* Rx 256-511 bytes frames */
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u32 hnc_rx_1023_frames; /* Rx 512-1023 bytes frames */
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u32 hnc_rx_1522_frames; /* Rx 1024-1522 bytes frames */
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u32 hnc_rx_9022_frames; /* Rx 1523-9022 bytes frames */
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u32 hnc_tx_64_frames; /* Tx 64-bytes frames */
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u32 hnc_tx_127_frames; /* Tx 65-127 bytes frames */
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u32 hnc_tx_255_frames; /* Tx 128-255 bytes frames */
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u32 hnc_tx_511_frames; /* Tx 256-511 bytes frames */
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u32 hnc_tx_1023_frames; /* Tx 512-1023 bytes frames */
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u32 hnc_tx_1522_frames; /* Tx 1024-1522 bytes frames */
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u32 hnc_tx_9022_frames; /* Tx 1523-9022 bytes frames */
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u32 hnc_rx_valid_bytes; /* Rx valid bytes */
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u32 hnc_rx_runt_pkts; /* Rx error runt packets */
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u32 hnc_rx_jabber_pkts; /* Rx error jabber packets */
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u32 ncsi_rx_cmds; /* Rx NCSI commands */
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u32 ncsi_dropped_cmds; /* Dropped commands */
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u32 ncsi_cmd_type_errs; /* Command type errors */
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u32 ncsi_cmd_csum_errs; /* Command checksum errors */
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u32 ncsi_rx_pkts; /* Rx NCSI packets */
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u32 ncsi_tx_pkts; /* Tx NCSI packets */
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u32 ncsi_tx_aen_pkts; /* Tx AEN packets */
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u32 pt_tx_pkts; /* Tx packets */
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u32 pt_tx_dropped; /* Tx dropped packets */
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u32 pt_tx_channel_err; /* Tx channel errors */
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u32 pt_tx_us_err; /* Tx undersize errors */
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u32 pt_rx_pkts; /* Rx packets */
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u32 pt_rx_dropped; /* Rx dropped packets */
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u32 pt_rx_channel_err; /* Rx channel errors */
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u32 pt_rx_us_err; /* Rx undersize errors */
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u32 pt_rx_os_err; /* Rx oversize errors */
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};
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struct ncsi_dev_priv;
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struct ncsi_package;
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#define NCSI_PACKAGE_SHIFT 5
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#define NCSI_PACKAGE_INDEX(c) (((c) >> NCSI_PACKAGE_SHIFT) & 0x7)
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#define NCSI_CHANNEL_INDEX(c) ((c) & ((1 << NCSI_PACKAGE_SHIFT) - 1))
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#define NCSI_TO_CHANNEL(p, c) (((p) << NCSI_PACKAGE_SHIFT) | (c))
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struct ncsi_channel {
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unsigned char id;
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int state;
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#define NCSI_CHANNEL_INACTIVE 1
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#define NCSI_CHANNEL_ACTIVE 2
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spinlock_t lock; /* Protect filters etc */
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struct ncsi_package *package;
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struct ncsi_channel_version version;
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struct ncsi_channel_cap caps[NCSI_CAP_MAX];
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struct ncsi_channel_mode modes[NCSI_MODE_MAX];
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struct ncsi_channel_filter *filters[NCSI_FILTER_MAX];
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struct ncsi_channel_stats stats;
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struct list_head node;
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};
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struct ncsi_package {
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unsigned char id; /* NCSI 3-bits package ID */
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unsigned char uuid[16]; /* UUID */
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struct ncsi_dev_priv *ndp; /* NCSI device */
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spinlock_t lock; /* Protect the package */
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unsigned int channel_num; /* Number of channels */
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struct list_head channels; /* List of chanels */
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struct list_head node; /* Form list of packages */
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};
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struct ncsi_request {
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unsigned char id; /* Request ID - 0 to 255 */
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bool used; /* Request that has been assigned */
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bool driven; /* Drive state machine */
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struct ncsi_dev_priv *ndp; /* Associated NCSI device */
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struct sk_buff *cmd; /* Associated NCSI command packet */
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struct sk_buff *rsp; /* Associated NCSI response packet */
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struct timer_list timer; /* Timer on waiting for response */
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bool enabled; /* Time has been enabled or not */
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};
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struct ncsi_dev_priv {
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struct ncsi_dev ndev; /* Associated NCSI device */
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unsigned int flags; /* NCSI device flags */
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spinlock_t lock; /* Protect the NCSI device */
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unsigned int package_num; /* Number of packages */
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struct list_head packages; /* List of packages */
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struct ncsi_request requests[256]; /* Request table */
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unsigned int request_id; /* Last used request ID */
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struct list_head node; /* Form NCSI device list */
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};
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extern struct list_head ncsi_dev_list;
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extern spinlock_t ncsi_dev_lock;
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#define TO_NCSI_DEV_PRIV(nd) \
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container_of(nd, struct ncsi_dev_priv, ndev)
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#define NCSI_FOR_EACH_DEV(ndp) \
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list_for_each_entry_rcu(ndp, &ncsi_dev_list, node)
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#define NCSI_FOR_EACH_PACKAGE(ndp, np) \
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list_for_each_entry_rcu(np, &ndp->packages, node)
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#define NCSI_FOR_EACH_CHANNEL(np, nc) \
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list_for_each_entry_rcu(nc, &np->channels, node)
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/* Resources */
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int ncsi_find_filter(struct ncsi_channel *nc, int table, void *data);
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int ncsi_add_filter(struct ncsi_channel *nc, int table, void *data);
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int ncsi_remove_filter(struct ncsi_channel *nc, int table, int index);
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struct ncsi_channel *ncsi_find_channel(struct ncsi_package *np,
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unsigned char id);
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struct ncsi_channel *ncsi_add_channel(struct ncsi_package *np,
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unsigned char id);
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struct ncsi_package *ncsi_find_package(struct ncsi_dev_priv *ndp,
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unsigned char id);
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struct ncsi_package *ncsi_add_package(struct ncsi_dev_priv *ndp,
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unsigned char id);
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void ncsi_remove_package(struct ncsi_package *np);
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void ncsi_find_package_and_channel(struct ncsi_dev_priv *ndp,
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unsigned char id,
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struct ncsi_package **np,
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struct ncsi_channel **nc);
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struct ncsi_request *ncsi_alloc_request(struct ncsi_dev_priv *ndp, bool driven);
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void ncsi_free_request(struct ncsi_request *nr);
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struct ncsi_dev *ncsi_find_dev(struct net_device *dev);
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#endif /* __NCSI_INTERNAL_H__ */
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@ -0,0 +1,436 @@
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/*
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* Copyright Gavin Shan, IBM Corporation 2016.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/netlink.h>
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#include <net/ncsi.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
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#include "internal.h"
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LIST_HEAD(ncsi_dev_list);
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DEFINE_SPINLOCK(ncsi_dev_lock);
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static inline int ncsi_filter_size(int table)
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{
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int sizes[] = { 2, 6, 6, 6 };
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BUILD_BUG_ON(ARRAY_SIZE(sizes) != NCSI_FILTER_MAX);
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if (table < NCSI_FILTER_BASE || table >= NCSI_FILTER_MAX)
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return -EINVAL;
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return sizes[table];
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}
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int ncsi_find_filter(struct ncsi_channel *nc, int table, void *data)
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{
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struct ncsi_channel_filter *ncf;
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void *bitmap;
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int index, size;
|
||||
unsigned long flags;
|
||||
|
||||
ncf = nc->filters[table];
|
||||
if (!ncf)
|
||||
return -ENXIO;
|
||||
|
||||
size = ncsi_filter_size(table);
|
||||
if (size < 0)
|
||||
return size;
|
||||
|
||||
spin_lock_irqsave(&nc->lock, flags);
|
||||
bitmap = (void *)&ncf->bitmap;
|
||||
index = -1;
|
||||
while ((index = find_next_bit(bitmap, ncf->total, index + 1))
|
||||
< ncf->total) {
|
||||
if (!memcmp(ncf->data + size * index, data, size)) {
|
||||
spin_unlock_irqrestore(&nc->lock, flags);
|
||||
return index;
|
||||
}
|
||||
}
|
||||
spin_unlock_irqrestore(&nc->lock, flags);
|
||||
|
||||
return -ENOENT;
|
||||
}
|
||||
|
||||
int ncsi_add_filter(struct ncsi_channel *nc, int table, void *data)
|
||||
{
|
||||
struct ncsi_channel_filter *ncf;
|
||||
int index, size;
|
||||
void *bitmap;
|
||||
unsigned long flags;
|
||||
|
||||
size = ncsi_filter_size(table);
|
||||
if (size < 0)
|
||||
return size;
|
||||
|
||||
index = ncsi_find_filter(nc, table, data);
|
||||
if (index >= 0)
|
||||
return index;
|
||||
|
||||
ncf = nc->filters[table];
|
||||
if (!ncf)
|
||||
return -ENODEV;
|
||||
|
||||
spin_lock_irqsave(&nc->lock, flags);
|
||||
bitmap = (void *)&ncf->bitmap;
|
||||
do {
|
||||
index = find_next_zero_bit(bitmap, ncf->total, 0);
|
||||
if (index >= ncf->total) {
|
||||
spin_unlock_irqrestore(&nc->lock, flags);
|
||||
return -ENOSPC;
|
||||
}
|
||||
} while (test_and_set_bit(index, bitmap));
|
||||
|
||||
memcpy(ncf->data + size * index, data, size);
|
||||
spin_unlock_irqrestore(&nc->lock, flags);
|
||||
|
||||
return index;
|
||||
}
|
||||
|
||||
int ncsi_remove_filter(struct ncsi_channel *nc, int table, int index)
|
||||
{
|
||||
struct ncsi_channel_filter *ncf;
|
||||
int size;
|
||||
void *bitmap;
|
||||
unsigned long flags;
|
||||
|
||||
size = ncsi_filter_size(table);
|
||||
if (size < 0)
|
||||
return size;
|
||||
|
||||
ncf = nc->filters[table];
|
||||
if (!ncf || index >= ncf->total)
|
||||
return -ENODEV;
|
||||
|
||||
spin_lock_irqsave(&nc->lock, flags);
|
||||
bitmap = (void *)&ncf->bitmap;
|
||||
if (test_and_clear_bit(index, bitmap))
|
||||
memset(ncf->data + size * index, 0, size);
|
||||
spin_unlock_irqrestore(&nc->lock, flags);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
struct ncsi_channel *ncsi_find_channel(struct ncsi_package *np,
|
||||
unsigned char id)
|
||||
{
|
||||
struct ncsi_channel *nc;
|
||||
|
||||
NCSI_FOR_EACH_CHANNEL(np, nc) {
|
||||
if (nc->id == id)
|
||||
return nc;
|
||||
}
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
struct ncsi_channel *ncsi_add_channel(struct ncsi_package *np, unsigned char id)
|
||||
{
|
||||
struct ncsi_channel *nc, *tmp;
|
||||
int index;
|
||||
unsigned long flags;
|
||||
|
||||
nc = kzalloc(sizeof(*nc), GFP_ATOMIC);
|
||||
if (!nc)
|
||||
return NULL;
|
||||
|
||||
nc->id = id;
|
||||
nc->package = np;
|
||||
nc->state = NCSI_CHANNEL_INACTIVE;
|
||||
spin_lock_init(&nc->lock);
|
||||
for (index = 0; index < NCSI_CAP_MAX; index++)
|
||||
nc->caps[index].index = index;
|
||||
for (index = 0; index < NCSI_MODE_MAX; index++)
|
||||
nc->modes[index].index = index;
|
||||
|
||||
spin_lock_irqsave(&np->lock, flags);
|
||||
tmp = ncsi_find_channel(np, id);
|
||||
if (tmp) {
|
||||
spin_unlock_irqrestore(&np->lock, flags);
|
||||
kfree(nc);
|
||||
return tmp;
|
||||
}
|
||||
|
||||
list_add_tail_rcu(&nc->node, &np->channels);
|
||||
np->channel_num++;
|
||||
spin_unlock_irqrestore(&np->lock, flags);
|
||||
|
||||
return nc;
|
||||
}
|
||||
|
||||
static void ncsi_remove_channel(struct ncsi_channel *nc)
|
||||
{
|
||||
struct ncsi_package *np = nc->package;
|
||||
struct ncsi_channel_filter *ncf;
|
||||
unsigned long flags;
|
||||
int i;
|
||||
|
||||
/* Release filters */
|
||||
spin_lock_irqsave(&nc->lock, flags);
|
||||
for (i = 0; i < NCSI_FILTER_MAX; i++) {
|
||||
ncf = nc->filters[i];
|
||||
if (!ncf)
|
||||
continue;
|
||||
|
||||
nc->filters[i] = NULL;
|
||||
kfree(ncf);
|
||||
}
|
||||
|
||||
nc->state = NCSI_CHANNEL_INACTIVE;
|
||||
spin_unlock_irqrestore(&nc->lock, flags);
|
||||
|
||||
/* Remove and free channel */
|
||||
spin_lock_irqsave(&np->lock, flags);
|
||||
list_del_rcu(&nc->node);
|
||||
np->channel_num--;
|
||||
spin_unlock_irqrestore(&np->lock, flags);
|
||||
|
||||
kfree(nc);
|
||||
}
|
||||
|
||||
struct ncsi_package *ncsi_find_package(struct ncsi_dev_priv *ndp,
|
||||
unsigned char id)
|
||||
{
|
||||
struct ncsi_package *np;
|
||||
|
||||
NCSI_FOR_EACH_PACKAGE(ndp, np) {
|
||||
if (np->id == id)
|
||||
return np;
|
||||
}
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
struct ncsi_package *ncsi_add_package(struct ncsi_dev_priv *ndp,
|
||||
unsigned char id)
|
||||
{
|
||||
struct ncsi_package *np, *tmp;
|
||||
unsigned long flags;
|
||||
|
||||
np = kzalloc(sizeof(*np), GFP_ATOMIC);
|
||||
if (!np)
|
||||
return NULL;
|
||||
|
||||
np->id = id;
|
||||
np->ndp = ndp;
|
||||
spin_lock_init(&np->lock);
|
||||
INIT_LIST_HEAD(&np->channels);
|
||||
|
||||
spin_lock_irqsave(&ndp->lock, flags);
|
||||
tmp = ncsi_find_package(ndp, id);
|
||||
if (tmp) {
|
||||
spin_unlock_irqrestore(&ndp->lock, flags);
|
||||
kfree(np);
|
||||
return tmp;
|
||||
}
|
||||
|
||||
list_add_tail_rcu(&np->node, &ndp->packages);
|
||||
ndp->package_num++;
|
||||
spin_unlock_irqrestore(&ndp->lock, flags);
|
||||
|
||||
return np;
|
||||
}
|
||||
|
||||
void ncsi_remove_package(struct ncsi_package *np)
|
||||
{
|
||||
struct ncsi_dev_priv *ndp = np->ndp;
|
||||
struct ncsi_channel *nc, *tmp;
|
||||
unsigned long flags;
|
||||
|
||||
/* Release all child channels */
|
||||
list_for_each_entry_safe(nc, tmp, &np->channels, node)
|
||||
ncsi_remove_channel(nc);
|
||||
|
||||
/* Remove and free package */
|
||||
spin_lock_irqsave(&ndp->lock, flags);
|
||||
list_del_rcu(&np->node);
|
||||
ndp->package_num--;
|
||||
spin_unlock_irqrestore(&ndp->lock, flags);
|
||||
|
||||
kfree(np);
|
||||
}
|
||||
|
||||
void ncsi_find_package_and_channel(struct ncsi_dev_priv *ndp,
|
||||
unsigned char id,
|
||||
struct ncsi_package **np,
|
||||
struct ncsi_channel **nc)
|
||||
{
|
||||
struct ncsi_package *p;
|
||||
struct ncsi_channel *c;
|
||||
|
||||
p = ncsi_find_package(ndp, NCSI_PACKAGE_INDEX(id));
|
||||
c = p ? ncsi_find_channel(p, NCSI_CHANNEL_INDEX(id)) : NULL;
|
||||
|
||||
if (np)
|
||||
*np = p;
|
||||
if (nc)
|
||||
*nc = c;
|
||||
}
|
||||
|
||||
/* For two consecutive NCSI commands, the packet IDs shouldn't
|
||||
* be same. Otherwise, the bogus response might be replied. So
|
||||
* the available IDs are allocated in round-robin fashion.
|
||||
*/
|
||||
struct ncsi_request *ncsi_alloc_request(struct ncsi_dev_priv *ndp, bool driven)
|
||||
{
|
||||
struct ncsi_request *nr = NULL;
|
||||
int i, limit = ARRAY_SIZE(ndp->requests);
|
||||
unsigned long flags;
|
||||
|
||||
/* Check if there is one available request until the ceiling */
|
||||
spin_lock_irqsave(&ndp->lock, flags);
|
||||
for (i = ndp->request_id; !nr && i < limit; i++) {
|
||||
if (ndp->requests[i].used)
|
||||
continue;
|
||||
|
||||
nr = &ndp->requests[i];
|
||||
nr->used = true;
|
||||
nr->driven = driven;
|
||||
if (++ndp->request_id >= limit)
|
||||
ndp->request_id = 0;
|
||||
}
|
||||
|
||||
/* Fail back to check from the starting cursor */
|
||||
for (i = 0; !nr && i < ndp->request_id; i++) {
|
||||
if (ndp->requests[i].used)
|
||||
continue;
|
||||
|
||||
nr = &ndp->requests[i];
|
||||
nr->used = true;
|
||||
nr->driven = driven;
|
||||
if (++ndp->request_id >= limit)
|
||||
ndp->request_id = 0;
|
||||
}
|
||||
spin_unlock_irqrestore(&ndp->lock, flags);
|
||||
|
||||
return nr;
|
||||
}
|
||||
|
||||
void ncsi_free_request(struct ncsi_request *nr)
|
||||
{
|
||||
struct ncsi_dev_priv *ndp = nr->ndp;
|
||||
struct sk_buff *cmd, *rsp;
|
||||
unsigned long flags;
|
||||
|
||||
if (nr->enabled) {
|
||||
nr->enabled = false;
|
||||
del_timer_sync(&nr->timer);
|
||||
}
|
||||
|
||||
spin_lock_irqsave(&ndp->lock, flags);
|
||||
cmd = nr->cmd;
|
||||
rsp = nr->rsp;
|
||||
nr->cmd = NULL;
|
||||
nr->rsp = NULL;
|
||||
nr->used = false;
|
||||
spin_unlock_irqrestore(&ndp->lock, flags);
|
||||
|
||||
/* Release command and response */
|
||||
consume_skb(cmd);
|
||||
consume_skb(rsp);
|
||||
}
|
||||
|
||||
struct ncsi_dev *ncsi_find_dev(struct net_device *dev)
|
||||
{
|
||||
struct ncsi_dev_priv *ndp;
|
||||
|
||||
NCSI_FOR_EACH_DEV(ndp) {
|
||||
if (ndp->ndev.dev == dev)
|
||||
return &ndp->ndev;
|
||||
}
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static void ncsi_request_timeout(unsigned long data)
|
||||
{
|
||||
struct ncsi_request *nr = (struct ncsi_request *)data;
|
||||
struct ncsi_dev_priv *ndp = nr->ndp;
|
||||
unsigned long flags;
|
||||
|
||||
/* If the request already had associated response,
|
||||
* let the response handler to release it.
|
||||
*/
|
||||
spin_lock_irqsave(&ndp->lock, flags);
|
||||
nr->enabled = false;
|
||||
if (nr->rsp || !nr->cmd) {
|
||||
spin_unlock_irqrestore(&ndp->lock, flags);
|
||||
return;
|
||||
}
|
||||
spin_unlock_irqrestore(&ndp->lock, flags);
|
||||
|
||||
/* Release the request */
|
||||
ncsi_free_request(nr);
|
||||
}
|
||||
|
||||
struct ncsi_dev *ncsi_register_dev(struct net_device *dev,
|
||||
void (*handler)(struct ncsi_dev *ndev))
|
||||
{
|
||||
struct ncsi_dev_priv *ndp;
|
||||
struct ncsi_dev *nd;
|
||||
unsigned long flags;
|
||||
int i;
|
||||
|
||||
/* Check if the device has been registered or not */
|
||||
nd = ncsi_find_dev(dev);
|
||||
if (nd)
|
||||
return nd;
|
||||
|
||||
/* Create NCSI device */
|
||||
ndp = kzalloc(sizeof(*ndp), GFP_ATOMIC);
|
||||
if (!ndp)
|
||||
return NULL;
|
||||
|
||||
nd = &ndp->ndev;
|
||||
nd->state = ncsi_dev_state_registered;
|
||||
nd->dev = dev;
|
||||
nd->handler = handler;
|
||||
|
||||
/* Initialize private NCSI device */
|
||||
spin_lock_init(&ndp->lock);
|
||||
INIT_LIST_HEAD(&ndp->packages);
|
||||
ndp->request_id = 0;
|
||||
for (i = 0; i < ARRAY_SIZE(ndp->requests); i++) {
|
||||
ndp->requests[i].id = i;
|
||||
ndp->requests[i].ndp = ndp;
|
||||
setup_timer(&ndp->requests[i].timer,
|
||||
ncsi_request_timeout,
|
||||
(unsigned long)&ndp->requests[i]);
|
||||
}
|
||||
|
||||
spin_lock_irqsave(&ncsi_dev_lock, flags);
|
||||
list_add_tail_rcu(&ndp->node, &ncsi_dev_list);
|
||||
spin_unlock_irqrestore(&ncsi_dev_lock, flags);
|
||||
|
||||
return nd;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ncsi_register_dev);
|
||||
|
||||
void ncsi_unregister_dev(struct ncsi_dev *nd)
|
||||
{
|
||||
struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
|
||||
struct ncsi_package *np, *tmp;
|
||||
unsigned long flags;
|
||||
|
||||
list_for_each_entry_safe(np, tmp, &ndp->packages, node)
|
||||
ncsi_remove_package(np);
|
||||
|
||||
spin_lock_irqsave(&ncsi_dev_lock, flags);
|
||||
list_del_rcu(&ndp->node);
|
||||
spin_unlock_irqrestore(&ncsi_dev_lock, flags);
|
||||
|
||||
kfree(ndp);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ncsi_unregister_dev);
|
||||
Loading…
Reference in New Issue