[PATCH 01/10] net/ncsi: Resource management
Gavin Shan
gwshan at linux.vnet.ibm.com
Thu Jun 30 20:27:42 AEST 2016
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.
* 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.
This also introduces CONFIG_NET_NCSI to enable NCSI stack.
Signed-off-by: Gavin Shan <gwshan at linux.vnet.ibm.com>
---
net/Kconfig | 1 +
net/Makefile | 1 +
net/ncsi/Kconfig | 10 ++
net/ncsi/Makefile | 4 +
net/ncsi/internal.h | 253 ++++++++++++++++++++++++++++
net/ncsi/ncsi-manage.c | 435 +++++++++++++++++++++++++++++++++++++++++++++++++
6 files changed, 704 insertions(+)
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/net/Kconfig b/net/Kconfig
index ff40562..c2cdbce 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -237,6 +237,7 @@ source "net/hsr/Kconfig"
source "net/switchdev/Kconfig"
source "net/l3mdev/Kconfig"
source "net/qrtr/Kconfig"
+source "net/ncsi/Kconfig"
config RPS
bool
diff --git a/net/Makefile b/net/Makefile
index bdd1455..9bd20bb 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -79,3 +79,4 @@ ifneq ($(CONFIG_NET_L3_MASTER_DEV),)
obj-y += l3mdev/
endif
obj-$(CONFIG_QRTR) += qrtr/
+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..4a8bd76
--- /dev/null
+++ b/net/ncsi/internal.h
@@ -0,0 +1,253 @@
+/*
+ * Copyright Gavin Shan, IBM Corporation 2016.
+ *
+ * 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.
+ */
+
+#ifndef __NCSI_INTERNAL_H__
+#define __NCSI_INTERNAL_H__
+
+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
+};
+
+enum {
+ NCSI_MODE_BASE = 0,
+ NCSI_MODE_ENABLE = 0,
+ NCSI_MODE_TX_ENABLE,
+ NCSI_MODE_LINK,
+ NCSI_MODE_VLAN,
+ NCSI_MODE_BC,
+ NCSI_MODE_MC,
+ NCSI_MODE_AEN,
+ NCSI_MODE_FC,
+ NCSI_MODE_MAX
+};
+
+enum {
+ NCSI_FILTER_BASE = 0,
+ NCSI_FILTER_VLAN = 0,
+ NCSI_FILTER_UC,
+ NCSI_FILTER_MC,
+ NCSI_FILTER_MIXED,
+ NCSI_FILTER_MAX
+};
+
+struct ncsi_channel_version {
+ unsigned int ncv_version; /* Supported BCD encoded NCSI version */
+ unsigned int ncv_alpha2; /* Supported 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 */
+};
+
+struct ncsi_channel_cap {
+ unsigned int ncc_index; /* Index of channel capabilities */
+ unsigned int ncc_cap; /* NCSI channel capability */
+};
+
+struct ncsi_channel_mode {
+ unsigned int ncm_index; /* Index of channel modes */
+ unsigned int ncm_enable; /* Enabled or disabled */
+ unsigned int ncm_size; /* Valid entries in ncm_data[] */
+ unsigned int ncm_data[8]; /* Data entries */
+};
+
+struct ncsi_channel_filter {
+ unsigned int ncf_index; /* Index of channel filters */
+ unsigned int ncf_total; /* Total entries in the filter table */
+ unsigned long ncf_bitmap; /* Bitmap of valid entries */
+ unsigned char ncf_data[]; /* Data for the valid entries */
+};
+
+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 */
+};
+
+struct ncsi_dev_priv;
+struct ncsi_package;
+
+#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))
+
+/* 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_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; /* NCSI package ID */
+ struct ncsi_dev_priv *np_ndp; /* NCSI device */
+ atomic_t np_channel_num; /* Number of channels */
+ spinlock_t np_channel_lock; /* Protect list of channels */
+ struct list_head np_channels; /* List of chanels */
+ struct list_head np_node;
+};
+
+struct ncsi_req {
+ unsigned char nr_id; /* Request ID */
+ bool nr_used; /* Request used or not */
+ struct ncsi_dev_priv *nr_ndp; /* NCSI device */
+ struct sk_buff *nr_cmd; /* Command packet */
+ struct sk_buff *nr_rsp; /* Response packet */
+ struct timer_list nr_timer; /* Associated timer */
+ bool nr_timer_enabled; /* Timer was started */
+};
+
+struct ncsi_dev_priv {
+ struct ncsi_dev ndp_ndev; /* NCSI device */
+ int ndp_flags; /* NCSI device flags */
+ struct ncsi_package *ndp_active_package; /* Active NCSI package */
+ struct ncsi_channel *ndp_active_channel; /* Active NCSI channel */
+ atomic_t ndp_package_num; /* Number of packages */
+ spinlock_t ndp_package_lock; /* Protect list of packages */
+ struct list_head ndp_packages; /* List of packages */
+ atomic_t ndp_last_req_idx; /* Last used request ID */
+ spinlock_t ndp_req_lock; /* Protect request table */
+ struct ncsi_req ndp_reqs[256]; /* Request table */
+ struct list_head ndp_node;
+};
+
+extern struct list_head ncsi_dev_list;
+extern spinlock_t ncsi_dev_lock;
+
+#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)
+
+/* Resources */
+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..dab54bc
--- /dev/null
+++ b/net/ncsi/ncsi-manage.c
@@ -0,0 +1,435 @@
+/*
+ * Copyright Gavin Shan, IBM Corporation 2016.
+ *
+ * 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;
+ int index;
+
+ nc = kzalloc(sizeof(*nc), GFP_ATOMIC);
+ if (!nc)
+ return NULL;
+
+ nc->nc_package = np;
+ nc->nc_id = id;
+ for (index = 0; index < NCSI_CAP_MAX; index++)
+ nc->nc_caps[index].ncc_index = index;
+ for (index = 0; index < NCSI_MODE_MAX; index++)
+ nc->nc_modes[index].ncm_index = index;
+
+ 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_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);
+}
+
+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)
+ 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);
+}
+
+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;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ndp->ndp_req_lock, flags);
+
+ /* 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_irqrestore(&ndp->ndp_req_lock, flags);
+ 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;
+ unsigned long flags;
+
+ if (nr->nr_timer_enabled) {
+ nr->nr_timer_enabled = false;
+ del_timer_sync(&nr->nr_timer);
+ }
+
+ spin_lock_irqsave(&ndp->ndp_req_lock, flags);
+ cmd = nr->nr_cmd;
+ rsp = nr->nr_rsp;
+ nr->nr_cmd = NULL;
+ nr->nr_rsp = NULL;
+ nr->nr_used = false;
+ spin_unlock_irqrestore(&ndp->ndp_req_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->ndp_ndev.nd_dev == dev)
+ return &ndp->ndp_ndev;
+ }
+
+ return NULL;
+}
+
+static void ncsi_req_timeout(unsigned long data)
+{
+ struct ncsi_req *nr = (struct ncsi_req *)data;
+ struct ncsi_dev_priv *ndp = nr->nr_ndp;
+ unsigned long flags;
+
+ /* If the request already had associated response,
+ * let the response handler to release it.
+ */
+ spin_lock_irqsave(&ndp->ndp_req_lock, flags);
+ nr->nr_timer_enabled = false;
+ if (nr->nr_rsp || !nr->nr_cmd) {
+ spin_unlock_irqrestore(&ndp->ndp_req_lock, flags);
+ return;
+ }
+ spin_unlock_irqrestore(&ndp->ndp_req_lock, flags);
+
+ /* Release the request */
+ ncsi_free_req(nr, true, true);
+}
+
+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;
+ int idx;
+
+ /* 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->ndp_ndev;
+ nd->nd_state = ncsi_dev_state_registered;
+ nd->nd_dev = dev;
+ nd->nd_handler = handler;
+
+ /* Initialize private NCSI device */
+ spin_lock_init(&ndp->ndp_package_lock);
+ INIT_LIST_HEAD(&ndp->ndp_packages);
+ spin_lock_init(&ndp->ndp_req_lock);
+ atomic_set(&ndp->ndp_last_req_idx, 0);
+ for (idx = 0; idx < 256; idx++) {
+ ndp->ndp_reqs[idx].nr_id = idx;
+ ndp->ndp_reqs[idx].nr_ndp = ndp;
+ setup_timer(&ndp->ndp_reqs[idx].nr_timer, ncsi_req_timeout,
+ (unsigned long)&ndp->ndp_reqs[idx]);
+ }
+
+ spin_lock(&ncsi_dev_lock);
+ list_add_tail_rcu(&ndp->ndp_node, &ncsi_dev_list);
+ spin_unlock(&ncsi_dev_lock);
+
+ 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;
+
+ spin_lock(&ndp->ndp_package_lock);
+ list_for_each_entry_safe(np, tmp, &ndp->ndp_packages, np_node)
+ ncsi_release_package(np);
+ spin_unlock(&ndp->ndp_package_lock);
+}
+EXPORT_SYMBOL_GPL(ncsi_unregister_dev);
--
2.1.0
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