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Date: Mon, 9 Nov 2015 11:10:01 +1100
From: Gavin Shan <gwshan@...ux.vnet.ibm.com>
To: netdev@...r.kernel.org
Cc: benh@...nel.crashing.org, davem@...emloft.net,
sergei.shtylyov@...entembedded.com,
Gavin Shan <gwshan@...ux.vnet.ibm.com>
Subject: [PATCH RFC 1/6] net/ncsi: Resource management
NCSI spec (DSP0222) defined several objects: package, channel,
mode, filter, version and statistics etc. This defines data
structrues to represent those objects and exports interfaces
(functions) to manage them:
* 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're represented by "struct ncsi_channel_version",
"struct ncsi_channel_stats", "struct ncsi_channel_mode" and
"struct ncsi_channel_filter" separately.
* The NCSI stack works in terms of command and response. One
command, sent over interface to target package/channel, is
expected to have a response. The same 8-bits ID are put into
the command and response. This patch abstracts the pair of
command and response by "struct ncsi_req".
* "struct ncsi_cmd_arg" is used to tell the specific command
to be sent over NCSI interface.
This also introduces CONFIG_NET_NCSI to enable NCSI stack.
Signed-off-by: Gavin Shan <gwshan@...ux.vnet.ibm.com>
---
include/net/ncsi.h | 30 ++++
net/Kconfig | 1 +
net/Makefile | 1 +
net/ncsi/Kconfig | 10 ++
net/ncsi/Makefile | 4 +
net/ncsi/internal.h | 306 +++++++++++++++++++++++++++++++++++++++++
net/ncsi/ncsi-manage.c | 363 +++++++++++++++++++++++++++++++++++++++++++++++++
7 files changed, 715 insertions(+)
create mode 100644 include/net/ncsi.h
create mode 100644 net/ncsi/Kconfig
create mode 100644 net/ncsi/Makefile
create mode 100644 net/ncsi/internal.h
create mode 100644 net/ncsi/ncsi-manage.c
diff --git a/include/net/ncsi.h b/include/net/ncsi.h
new file mode 100644
index 0000000..2735f19
--- /dev/null
+++ b/include/net/ncsi.h
@@ -0,0 +1,30 @@
+#ifndef __NET_NCSI_H
+#define __NET_NCSI_H
+
+/*
+ * The NCSI device states seen from external. More NCSI device states are
+ * only visible internally (in net/ncsi/internal.h). When the NCSI device
+ * is registered, it's in ncsi_dev_state_registered state. The state
+ * ncsi_dev_state_start is used to drive to choose active package and
+ * channel. After that, its state is changed to ncsi_dev_state_functional.
+ *
+ * The state ncsi_dev_state_stop helps to shut down the currently active
+ * package and channel while ncsi_dev_state_config helps to reconfigure
+ * them.
+ */
+enum {
+ ncsi_dev_state_registered = 0x0000,
+ ncsi_dev_state_functional = 0x0100,
+ ncsi_dev_state_start = 0x0200,
+ ncsi_dev_state_config = 0x0300,
+ ncsi_dev_state_stop = 0x0400
+};
+
+struct ncsi_dev {
+ int nd_state;
+ int nd_link_up;
+ struct net_device *nd_dev;
+ void (*nd_handler)(struct ncsi_dev *ndev);
+};
+
+#endif /* __NET_NCSI_H */
diff --git a/net/Kconfig b/net/Kconfig
index 57a7c5a..a92fc73 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -232,6 +232,7 @@ source "net/netlink/Kconfig"
source "net/mpls/Kconfig"
source "net/hsr/Kconfig"
source "net/switchdev/Kconfig"
+source "net/ncsi/Kconfig"
config RPS
bool
diff --git a/net/Makefile b/net/Makefile
index 3995613..9c1d4b1 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -74,3 +74,4 @@ obj-$(CONFIG_HSR) += hsr/
ifneq ($(CONFIG_NET_SWITCHDEV),)
obj-y += switchdev/
endif
+obj-$(CONFIG_NET_NCSI) += ncsi/
diff --git a/net/ncsi/Kconfig b/net/ncsi/Kconfig
new file mode 100644
index 0000000..723f0eb
--- /dev/null
+++ b/net/ncsi/Kconfig
@@ -0,0 +1,10 @@
+#
+# Configuration for NCSI support
+#
+
+config NET_NCSI
+ bool "NCSI interface support (EXPERIMENTAL)"
+ depends on INET
+ ---help---
+ This module provides NCSI (Network Controller Sideband Interface)
+ support.
diff --git a/net/ncsi/Makefile b/net/ncsi/Makefile
new file mode 100644
index 0000000..07b5625
--- /dev/null
+++ b/net/ncsi/Makefile
@@ -0,0 +1,4 @@
+#
+# Makefile for NCSI API
+#
+obj-$(CONFIG_NET_NCSI) += ncsi-manage.o
diff --git a/net/ncsi/internal.h b/net/ncsi/internal.h
new file mode 100644
index 0000000..958fd69
--- /dev/null
+++ b/net/ncsi/internal.h
@@ -0,0 +1,306 @@
+#ifndef __NCSI_INTERNAL_H__
+#define __NCSI_INTERNAL_H__
+
+/* NCSI channel capabilities */
+enum {
+ NCSI_CAP_BASE = 0,
+ NCSI_CAP_GENERIC = 0,
+ NCSI_CAP_BC,
+ NCSI_CAP_MC,
+ NCSI_CAP_BUFFER,
+ NCSI_CAP_AEN,
+ NCSI_CAP_VLAN,
+ NCSI_CAP_MAX
+};
+
+enum {
+ NCSI_CAP_GENERIC_HWA = 0x01, /* HW arbitration */
+ NCSI_CAP_GENERIC_HDS = 0x02, /* HNC driver status change */
+ NCSI_CAP_GENERIC_FC = 0x04, /* HNC to MC flow control */
+ NCSI_CAP_GENERIC_FC1 = 0x08, /* MC to HNC flow control */
+ NCSI_CAP_GENERIC_MC = 0x10, /* Global multicast filtering */
+ NCSI_CAP_GENERIC_MASK = 0x1f,
+ NCSI_CAP_BC_ARP = 0x01, /* ARP packet filtering */
+ NCSI_CAP_BC_DHCPC = 0x02, /* DHCP client filtering */
+ NCSI_CAP_BC_DHCPS = 0x04, /* DHCP server filtering */
+ NCSI_CAP_BC_NETBIOS = 0x08, /* NetBIOS packet filtering */
+ NCSI_CAP_BC_MASK = 0x0f,
+ NCSI_CAP_MC_NEIGHBOR = 0x01, /* IPv6 neighbor filtering */
+ NCSI_CAP_MC_ROUTER = 0x02, /* IPv6 router filering */
+ NCSI_CAP_MC_DHCPv6 = 0x04, /* DHCPv6 filtering */
+ NCSI_CAP_MC_MASK = 0x07,
+ NCSI_CAP_AEN_LSC = 0x01, /* Link status change AEN */
+ NCSI_CAP_AEN_CR = 0x02, /* Configuration required AEN */
+ NCSI_CAP_AEN_HDS = 0x04, /* HNC driver status AEN */
+ NCSI_CAP_AEN_MASK = 0x07,
+ NCSI_CAP_VLAN_ONLY = 0x01, /* VLAN is supported */
+ NCSI_CAP_VLAN_NO = 0x02, /* Filter VLAN and non-VLAN */
+ NCSI_CAP_VLAN_ANY = 0x04, /* Filter Any-and-non-VLAN */
+ NCSI_CAP_VLAN_MASK = 0x07
+};
+
+/* NCSI channel mode */
+enum {
+ NCSI_MODE_BASE = 0,
+ NCSI_MODE_ENABLE = 0, /* Channel enabled or disabled */
+ NCSI_MODE_TX_ENABLE, /* Tx enabled or disabled */
+ NCSI_MODE_LINK, /* Link mode */
+ NCSI_MODE_VLAN, /* VLAN filtering mode */
+ NCSI_MODE_BC, /* Broadcom filtering mode */
+ NCSI_MODE_MC, /* Multicast filtering mode */
+ NCSI_MODE_AEN, /* AEN enabled or disabled */
+ NCSI_MODE_FC, /* Flow control mode */
+ NCSI_MODE_MAX
+};
+
+/* NCSI channel filters */
+enum {
+ NCSI_FILTER_BASE = 0,
+ NCSI_FILTER_VLAN = 0,
+ NCSI_FILTER_UC,
+ NCSI_FILTER_MC,
+ NCSI_FILTER_MIXED,
+ NCSI_FILTER_MAX
+};
+
+/* NCSI channel version */
+struct ncsi_channel_version {
+ unsigned int ncv_version; /* BCD encoded NCSI version */
+ unsigned int ncv_alpha2; /* BCD encoded NCSI version */
+ unsigned char ncv_fw_name[12]; /* Firware name string */
+ unsigned int ncv_fw_version; /* Firmware version */
+ unsigned short ncv_pci_ids[4]; /* PCI identification */
+ unsigned int ncv_mf_id; /* Manufacture ID */
+};
+
+/* NCSI channel capability */
+struct ncsi_channel_cap {
+ unsigned int ncc_cap; /* NCSI channel capability */
+};
+
+/* NCSI channel mode */
+struct ncsi_channel_mode {
+ unsigned int ncm_enable; /* Enabled or disabled */
+ unsigned int ncm_size; /* Valid entries in ncm_data[] */
+ unsigned int ncm_data[8]; /* Specific data for the mode */
+};
+
+/*
+ * NCSI channel filter. According to NCSI spec, the total number
+ * of filters can't exceed 32. So it's enough to use 32 bits to
+ * track their usage
+ */
+struct ncsi_channel_filter {
+ unsigned int ncf_total; /* Total entries in the filter table */
+ unsigned int ncf_entry_size; /* Number of bytes per entry */
+ unsigned int ncf_bitmap; /* Bitmap of valid entries */
+ unsigned char ncf_data[]; /* Data for the valid entries */
+};
+
+/* NCSI channel statistics */
+struct ncsi_channel_stats {
+ unsigned int ncs_hnc_cnt_hi; /* Counter cleared */
+ unsigned int ncs_hnc_cnt_lo; /* Counter cleared */
+ unsigned int ncs_hnc_rx_bytes; /* Rx bytes */
+ unsigned int ncs_hnc_tx_bytes; /* Tx bytes */
+ unsigned int ncs_hnc_rx_uc_pkts; /* Rx UC packets */
+ unsigned int ncs_hnc_rx_mc_pkts; /* Rx MC packets */
+ unsigned int ncs_hnc_rx_bc_pkts; /* Rx BC packets */
+ unsigned int ncs_hnc_tx_uc_pkts; /* Tx UC packets */
+ unsigned int ncs_hnc_tx_mc_pkts; /* Tx MC packets */
+ unsigned int ncs_hnc_tx_bc_pkts; /* Tx BC packets */
+ unsigned int ncs_hnc_fcs_err; /* FCS errors */
+ unsigned int ncs_hnc_align_err; /* Alignment errors */
+ unsigned int ncs_hnc_false_carrier; /* False carrier detection */
+ unsigned int ncs_hnc_runt_pkts; /* Rx runt packets */
+ unsigned int ncs_hnc_jabber_pkts; /* Rx jabber packets */
+ unsigned int ncs_hnc_rx_pause_xon; /* Rx pause XON frames */
+ unsigned int ncs_hnc_rx_pause_xoff; /* Rx XOFF frames */
+ unsigned int ncs_hnc_tx_pause_xon; /* Tx XON frames */
+ unsigned int ncs_hnc_tx_pause_xoff; /* Tx XOFF frames */
+ unsigned int ncs_hnc_tx_s_collision; /* Single collision frames */
+ unsigned int ncs_hnc_tx_m_collision; /* Multiple collision frames */
+ unsigned int ncs_hnc_l_collision; /* Late collision frames */
+ unsigned int ncs_hnc_e_collision; /* Excessive collision frames */
+ unsigned int ncs_hnc_rx_ctl_frames; /* Rx control frames */
+ unsigned int ncs_hnc_rx_64_frames; /* Rx 64-bytes frames */
+ unsigned int ncs_hnc_rx_127_frames; /* Rx 65-127 bytes frames */
+ unsigned int ncs_hnc_rx_255_frames; /* Rx 128-255 bytes frames */
+ unsigned int ncs_hnc_rx_511_frames; /* Rx 256-511 bytes frames */
+ unsigned int ncs_hnc_rx_1023_frames; /* Rx 512-1023 bytes frames */
+ unsigned int ncs_hnc_rx_1522_frames; /* Rx 1024-1522 bytes frames */
+ unsigned int ncs_hnc_rx_9022_frames; /* Rx 1523-9022 bytes frames */
+ unsigned int ncs_hnc_tx_64_frames; /* Tx 64-bytes frames */
+ unsigned int ncs_hnc_tx_127_frames; /* Tx 65-127 bytes frames */
+ unsigned int ncs_hnc_tx_255_frames; /* Tx 128-255 bytes frames */
+ unsigned int ncs_hnc_tx_511_frames; /* Tx 256-511 bytes frames */
+ unsigned int ncs_hnc_tx_1023_frames; /* Tx 512-1023 bytes frames */
+ unsigned int ncs_hnc_tx_1522_frames; /* Tx 1024-1522 bytes frames */
+ unsigned int ncs_hnc_tx_9022_frames; /* Tx 1523-9022 bytes frames */
+ unsigned int ncs_hnc_rx_valid_bytes; /* Rx valid bytes */
+ unsigned int ncs_hnc_rx_runt_pkts; /* Rx error runt packets */
+ unsigned int ncs_hnc_rx_jabber_pkts; /* Rx error jabber packets */
+ unsigned int ncs_ncsi_rx_cmds; /* Rx NCSI commands */
+ unsigned int ncs_ncsi_dropped_cmds; /* Dropped commands */
+ unsigned int ncs_ncsi_cmd_type_errs; /* Command type errors */
+ unsigned int ncs_ncsi_cmd_csum_errs; /* Command checksum errors */
+ unsigned int ncs_ncsi_rx_pkts; /* Rx NCSI packets */
+ unsigned int ncs_ncsi_tx_pkts; /* Tx NCSI packets */
+ unsigned int ncs_ncsi_tx_aen_pkts; /* Tx AEN packets */
+ unsigned int ncs_pt_tx_pkts; /* Tx packets */
+ unsigned int ncs_pt_tx_dropped; /* Tx dropped packets */
+ unsigned int ncs_pt_tx_channel_err; /* Tx channel errors */
+ unsigned int ncs_pt_tx_us_err; /* Tx undersize errors */
+ unsigned int ncs_pt_rx_pkts; /* Rx packets */
+ unsigned int ncs_pt_rx_dropped; /* Rx dropped packets */
+ unsigned int ncs_pt_rx_channel_err; /* Rx channel errors */
+ unsigned int ncs_pt_rx_us_err; /* Rx undersize errors */
+ unsigned int ncs_pt_rx_os_err; /* Rx oversize errors */
+};
+
+/* NCSI channel state */
+enum {
+ ncsi_channel_state_deselected_initial,
+ ncsi_channel_state_selected_initial,
+ ncsi_channel_state_deselected_ready,
+ ncsi_channel_state_selected_ready,
+};
+
+struct ncsi_package;
+struct ncsi_dev_priv;
+struct ncsi_channel {
+ unsigned char nc_id;
+ int nc_state;
+ struct ncsi_package *nc_package;
+ struct ncsi_channel_version nc_version;
+ struct ncsi_channel_cap nc_caps[NCSI_CAP_MAX];
+ struct ncsi_channel_mode nc_modes[NCSI_MODE_MAX];
+ struct ncsi_channel_filter *nc_filters[NCSI_FILTER_MAX];
+ struct ncsi_channel_stats nc_stats;
+ struct list_head nc_node;
+};
+
+struct ncsi_package {
+ unsigned char np_id;
+ struct ncsi_dev_priv *np_ndp;
+ atomic_t np_channel_num;
+ spinlock_t np_channel_lock;
+ struct list_head np_channels;
+ struct list_head np_node;
+};
+
+struct ncsi_req {
+ unsigned char nr_id;
+ bool nr_used;
+ struct ncsi_dev_priv *nr_ndp;
+ struct sk_buff *nr_cmd;
+ struct sk_buff *nr_rsp;
+ struct timer_list nr_timer;
+ bool nr_timer_enabled;
+};
+
+/*
+ * The NCSI device state is made up of major and minor states.
+ * The major state is driven by the public APIs. The minor states
+ * are for internal usage to complete the function in that API.
+ */
+enum {
+ ncsi_dev_state_major = 0xff00,
+ ncsi_dev_state_minor = 0x00ff,
+ ncsi_dev_state_start_deselect = 0x0201,
+ ncsi_dev_state_start_package,
+ ncsi_dev_state_start_channel,
+ ncsi_dev_state_start_sp,
+ ncsi_dev_state_start_cis,
+ ncsi_dev_state_start_gvi,
+ ncsi_dev_state_start_gc,
+ ncsi_dev_state_start_dp,
+ ncsi_dev_state_start_active,
+ ncsi_dev_state_config_sp = 0x0301,
+ ncsi_dev_state_config_cis,
+ ncsi_dev_state_config_sma,
+ ncsi_dev_state_config_ebf,
+ ncsi_dev_state_config_ecnt,
+ ncsi_dev_state_config_ec,
+ ncsi_dev_state_config_gls,
+ ncsi_dev_state_config_done,
+ ncsi_dev_state_stop_select = 0x0401,
+ ncsi_dev_state_stop_dcnt,
+ ncsi_dev_state_stop_dc,
+ ncsi_dev_state_stop_deselect,
+ ncsi_dev_state_stop_done
+};
+
+struct ncsi_dev_priv {
+ struct ncsi_dev ndp_ndev;
+#define NCSI_DEV_FLAG_CHANGE_ACTIVE 0x1
+ int ndp_flags;
+ struct ncsi_package *ndp_active_package;
+ struct ncsi_channel *ndp_active_channel;
+ atomic_t ndp_package_num;
+ spinlock_t ndp_package_lock;
+ struct list_head ndp_packages;
+ atomic_t ndp_pending_reqs;
+ atomic_t ndp_last_req_idx;
+ spinlock_t ndp_req_lock;
+#define NCSI_DEV_MAX_REQ 256
+ struct ncsi_req ndp_reqs[NCSI_DEV_MAX_REQ];
+ struct work_struct ndp_work;
+ struct packet_type ndp_ptype;
+ struct list_head ndp_node;
+};
+
+struct ncsi_cmd_arg {
+ struct ncsi_dev_priv *nca_ndp;
+ unsigned char nca_type;
+ unsigned char nca_id;
+ unsigned char nca_package;
+ unsigned char nca_channel;
+ unsigned short nca_payload;
+ unsigned int nca_portid;
+ union {
+ unsigned char nca_bytes[16];
+ unsigned short nca_words[8];
+ unsigned int nca_dwords[4];
+ };
+};
+
+extern struct net *ncsi_net;
+extern struct list_head ncsi_dev_list;
+extern spinlock_t ncsi_dev_lock;
+
+#define NCSI_PACKAGE_INDEX(c) (((c) >> 5) & 0x7)
+#define NCSI_CHANNEL_INDEX(c) ((c) & 0x1ffff)
+#define NCSI_TO_CHANNEL(p, c) ((((p) & 0x7) << 5) | ((c) & 0x1ffff))
+
+#define TO_NCSI_DEV_PRIV(nd) \
+ container_of(nd, struct ncsi_dev_priv, ndp_ndev)
+#define NCSI_FOR_EACH_DEV(ndp) \
+ list_for_each_entry_rcu(ndp, &ncsi_dev_list, ndp_node)
+#define NCSI_FOR_EACH_PACKAGE(ndp, np) \
+ list_for_each_entry_rcu(np, &ndp->ndp_packages, np_node)
+#define NCSI_FOR_EACH_CHANNEL(np, nc) \
+ list_for_each_entry_rcu(nc, &np->np_channels, nc_node)
+
+/* Resource management */
+int ncsi_find_channel_filter(struct ncsi_channel *nc, int table, void *data);
+int ncsi_add_channel_filter(struct ncsi_channel *nc, int table, void *data);
+int ncsi_del_channel_filter(struct ncsi_channel *nc, int table, int index);
+struct ncsi_channel *ncsi_add_channel(struct ncsi_package *np,
+ unsigned char id);
+struct ncsi_channel *ncsi_find_channel(struct ncsi_package *np,
+ unsigned char id);
+struct ncsi_package *ncsi_add_package(struct ncsi_dev_priv *ndp,
+ unsigned char id);
+struct ncsi_package *ncsi_find_package(struct ncsi_dev_priv *ndp,
+ unsigned char id);
+void ncsi_release_package(struct ncsi_package *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_req *ncsi_alloc_req(struct ncsi_dev_priv *ndp);
+void ncsi_free_req(struct ncsi_req *nr, bool check, bool timeout);
+struct ncsi_dev *ncsi_find_dev(struct net_device *dev);
+
+#endif /* __NCSI_INTERNAL_H__ */
diff --git a/net/ncsi/ncsi-manage.c b/net/ncsi/ncsi-manage.c
new file mode 100644
index 0000000..eb23222
--- /dev/null
+++ b/net/ncsi/ncsi-manage.c
@@ -0,0 +1,363 @@
+/*
+ * Copyright Gavin Shan, IBM Corporation 2015.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/netlink.h>
+
+#include <net/ncsi.h>
+#include <net/net_namespace.h>
+#include <net/sock.h>
+
+#include "internal.h"
+
+LIST_HEAD(ncsi_dev_list);
+DEFINE_SPINLOCK(ncsi_dev_lock);
+
+int ncsi_find_channel_filter(struct ncsi_channel *nc, int table, void *data)
+{
+ struct ncsi_channel_filter *ncf;
+ int idx, entry_size;
+ void *bitmap;
+
+ switch (table) {
+ case NCSI_FILTER_VLAN:
+ entry_size = 2;
+ break;
+ case NCSI_FILTER_UC:
+ case NCSI_FILTER_MC:
+ case NCSI_FILTER_MIXED:
+ entry_size = 6;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* Check if the filter table has been initialized */
+ ncf = nc->nc_filters[table];
+ if (!ncf)
+ return -ENODEV;
+
+ /* Check the valid entries one by one */
+ bitmap = (void *)&ncf->ncf_bitmap;
+ idx = -1;
+ while ((idx = find_next_bit(bitmap, ncf->ncf_total, idx+1))
+ < ncf->ncf_total) {
+ if (!memcmp(ncf->ncf_data + entry_size * idx, data, entry_size))
+ return idx;
+ }
+
+ return -ENOENT;
+}
+
+int ncsi_add_channel_filter(struct ncsi_channel *nc, int table, void *data)
+{
+ struct ncsi_channel_filter *ncf;
+ int idx, entry_size;
+ void *bitmap;
+
+ /* Needn't add it if it's already existing */
+ idx = ncsi_find_channel_filter(nc, table, data);
+ if (idx >= 0)
+ return idx;
+
+ switch (table) {
+ case NCSI_FILTER_VLAN:
+ entry_size = 2;
+ break;
+ case NCSI_FILTER_UC:
+ case NCSI_FILTER_MC:
+ case NCSI_FILTER_MIXED:
+ entry_size = 6;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* Check if the filter table has been initialized */
+ ncf = nc->nc_filters[table];
+ if (!ncf)
+ return -ENODEV;
+
+ /* Propagate the filter */
+ bitmap = (void *)&ncf->ncf_bitmap;
+ do {
+ idx = find_next_zero_bit(bitmap, ncf->ncf_total, 0);
+ if (idx >= ncf->ncf_total)
+ return -ENOSPC;
+ } while (test_and_set_bit(idx, bitmap));
+
+ memcpy(ncf->ncf_data + entry_size * idx, data, entry_size);
+ return idx;
+}
+
+int ncsi_del_channel_filter(struct ncsi_channel *nc, int table, int index)
+{
+ struct ncsi_channel_filter *ncf;
+ int entry_size;
+ void *bitmap;
+
+ switch (table) {
+ case NCSI_FILTER_VLAN:
+ entry_size = 2;
+ break;
+ case NCSI_FILTER_UC:
+ case NCSI_FILTER_MC:
+ case NCSI_FILTER_MIXED:
+ entry_size = 6;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* Check if the filter table has been initialized */
+ ncf = nc->nc_filters[table];
+ if (!ncf || index >= ncf->ncf_total)
+ return -ENODEV;
+
+ /* Check if the entry is valid */
+ bitmap = (void *)&ncf->ncf_bitmap;
+ if (test_and_clear_bit(index, bitmap))
+ memset(ncf->ncf_data + entry_size * index, 0, entry_size);
+
+ return 0;
+}
+
+struct ncsi_channel *ncsi_add_channel(struct ncsi_package *np, unsigned char id)
+{
+ struct ncsi_channel *nc, *tmp;
+
+ nc = kzalloc(sizeof(*nc), GFP_ATOMIC);
+ if (!nc) {
+ pr_warn("%s: Out of memory !\n", __func__);
+ return NULL;
+ }
+
+ nc->nc_package = np;
+ nc->nc_id = id;
+
+ spin_lock(&np->np_channel_lock);
+ tmp = ncsi_find_channel(np, id);
+ if (tmp) {
+ spin_unlock(&np->np_channel_lock);
+ kfree(nc);
+ return tmp;
+ }
+ list_add_tail_rcu(&nc->nc_node, &np->np_channels);
+ spin_unlock(&np->np_channel_lock);
+
+ atomic_inc(&np->np_channel_num);
+ return nc;
+}
+
+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->nc_id == id)
+ return nc;
+ }
+
+ return NULL;
+}
+
+static void ncsi_release_channel(struct ncsi_channel *nc)
+{
+ struct ncsi_dev_priv *ndp = nc->nc_package->np_ndp;
+ struct ncsi_package *np = nc->nc_package;
+ struct ncsi_channel_filter *ncf;
+ int i;
+
+ /* Release filters */
+ for (i = 0; i < NCSI_FILTER_MAX; i++) {
+ ncf = nc->nc_filters[i];
+ if (!ncf)
+ continue;
+
+ nc->nc_filters[i] = NULL;
+ kfree(ncf);
+ }
+
+ /* Update active channel if necessary */
+ if (ndp->ndp_active_channel == nc) {
+ ndp->ndp_active_package = NULL;
+ ndp->ndp_active_channel = NULL;
+ }
+
+ /* Remove and free channel */
+ list_del_rcu(&nc->nc_node);
+ kfree(nc);
+ BUG_ON(atomic_dec_return(&np->np_channel_num) < 0);
+}
+
+struct ncsi_package *ncsi_add_package(struct ncsi_dev_priv *ndp,
+ unsigned char id)
+{
+ struct ncsi_package *np, *tmp;
+
+ np = kzalloc(sizeof(*np), GFP_ATOMIC);
+ if (!np) {
+ pr_warn("%s: Out of memory !\n", __func__);
+ return NULL;
+ }
+
+ np->np_id = id;
+ np->np_ndp = ndp;
+ spin_lock_init(&np->np_channel_lock);
+ INIT_LIST_HEAD(&np->np_channels);
+
+ spin_lock(&ndp->ndp_package_lock);
+ tmp = ncsi_find_package(ndp, id);
+ if (tmp) {
+ spin_unlock(&ndp->ndp_package_lock);
+ kfree(np);
+ return tmp;
+ }
+ list_add_tail_rcu(&np->np_node, &ndp->ndp_packages);
+ spin_unlock(&ndp->ndp_package_lock);
+
+ atomic_inc(&ndp->ndp_package_num);
+ return np;
+}
+
+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->np_id == id)
+ return np;
+ }
+
+ return NULL;
+}
+
+void ncsi_release_package(struct ncsi_package *np)
+{
+ struct ncsi_dev_priv *ndp = np->np_ndp;
+ struct ncsi_channel *nc, *tmp;
+
+ /* Release all child channels */
+ spin_lock(&np->np_channel_lock);
+ list_for_each_entry_safe(nc, tmp, &np->np_channels, nc_node)
+ ncsi_release_channel(nc);
+ spin_unlock(&np->np_channel_lock);
+
+ /* Clear active package if necessary */
+ if (ndp->ndp_active_package == np) {
+ ndp->ndp_active_package = NULL;
+ ndp->ndp_active_channel = NULL;
+ }
+
+ /* Remove and free package */
+ list_del_rcu(&np->np_node);
+ kfree(np);
+
+ /* Decrease number of packages */
+ BUG_ON(atomic_dec_return(&ndp->ndp_package_num) < 0);
+}
+
+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 consective 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 fasion.
+ */
+struct ncsi_req *ncsi_alloc_req(struct ncsi_dev_priv *ndp)
+{
+ struct ncsi_req *nr = NULL;
+ int idx, limit = 256;
+
+ spin_lock(&ndp->ndp_req_lock);
+
+ /* Check if there is one available request until the ceiling */
+ for (idx = atomic_read(&ndp->ndp_last_req_idx);
+ !nr && idx < limit; idx++) {
+ if (ndp->ndp_reqs[idx].nr_used)
+ continue;
+
+ ndp->ndp_reqs[idx].nr_used = true;
+ nr = &ndp->ndp_reqs[idx];
+ atomic_inc(&ndp->ndp_last_req_idx);
+ if (atomic_read(&ndp->ndp_last_req_idx) >= limit)
+ atomic_set(&ndp->ndp_last_req_idx, 0);
+ }
+
+ /* Fail back to check from the starting cursor */
+ for (idx = 0; !nr && idx < atomic_read(&ndp->ndp_last_req_idx); idx++) {
+ if (ndp->ndp_reqs[idx].nr_used)
+ continue;
+
+ ndp->ndp_reqs[idx].nr_used = true;
+ nr = &ndp->ndp_reqs[idx];
+ atomic_inc(&ndp->ndp_last_req_idx);
+ if (atomic_read(&ndp->ndp_last_req_idx) >= limit)
+ atomic_set(&ndp->ndp_last_req_idx, 0);
+ }
+
+ spin_unlock(&ndp->ndp_req_lock);
+ return nr;
+}
+
+void ncsi_free_req(struct ncsi_req *nr, bool check, bool timeout)
+{
+ struct ncsi_dev_priv *ndp = nr->nr_ndp;
+ struct sk_buff *cmd, *rsp;
+
+ if (nr->nr_timer_enabled) {
+ nr->nr_timer_enabled = false;
+ del_timer_sync(&nr->nr_timer);
+ }
+
+ spin_lock(&ndp->ndp_req_lock);
+ cmd = nr->nr_cmd;
+ rsp = nr->nr_rsp;
+ nr->nr_cmd = NULL;
+ nr->nr_rsp = NULL;
+ nr->nr_used = false;
+ spin_unlock(&ndp->ndp_req_lock);
+
+ /* 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->ndp_ndev.nd_dev == dev)
+ return &ndp->ndp_ndev;
+ }
+
+ return NULL;
+}
--
2.1.0
--
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