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linux/net/ncsi/ncsi-manage.c

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/*
* 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 <net/ncsi.h>
#include <net/net_namespace.h>
#include <net/sock.h>
#include <net/addrconf.h>
#include <net/ipv6.h>
#include <net/if_inet6.h>
#include <net/genetlink.h>
#include "internal.h"
#include "ncsi-pkt.h"
#include "ncsi-netlink.h"
LIST_HEAD(ncsi_dev_list);
DEFINE_SPINLOCK(ncsi_dev_lock);
static void ncsi_report_link(struct ncsi_dev_priv *ndp, bool force_down)
{
struct ncsi_dev *nd = &ndp->ndev;
struct ncsi_package *np;
struct ncsi_channel *nc;
unsigned long flags;
nd->state = ncsi_dev_state_functional;
if (force_down) {
nd->link_up = 0;
goto report;
}
nd->link_up = 0;
NCSI_FOR_EACH_PACKAGE(ndp, np) {
NCSI_FOR_EACH_CHANNEL(np, nc) {
spin_lock_irqsave(&nc->lock, flags);
if (!list_empty(&nc->link) ||
nc->state != NCSI_CHANNEL_ACTIVE) {
spin_unlock_irqrestore(&nc->lock, flags);
continue;
}
if (nc->modes[NCSI_MODE_LINK].data[2] & 0x1) {
spin_unlock_irqrestore(&nc->lock, flags);
nd->link_up = 1;
goto report;
}
spin_unlock_irqrestore(&nc->lock, flags);
}
}
report:
nd->handler(nd);
}
static void ncsi_channel_monitor(struct timer_list *t)
{
struct ncsi_channel *nc = from_timer(nc, t, monitor.timer);
struct ncsi_package *np = nc->package;
struct ncsi_dev_priv *ndp = np->ndp;
struct ncsi_channel_mode *ncm;
struct ncsi_cmd_arg nca;
bool enabled, chained;
unsigned int monitor_state;
unsigned long flags;
int state, ret;
spin_lock_irqsave(&nc->lock, flags);
state = nc->state;
chained = !list_empty(&nc->link);
enabled = nc->monitor.enabled;
monitor_state = nc->monitor.state;
spin_unlock_irqrestore(&nc->lock, flags);
if (!enabled || chained) {
ncsi_stop_channel_monitor(nc);
return;
}
if (state != NCSI_CHANNEL_INACTIVE &&
state != NCSI_CHANNEL_ACTIVE) {
ncsi_stop_channel_monitor(nc);
return;
}
switch (monitor_state) {
case NCSI_CHANNEL_MONITOR_START:
case NCSI_CHANNEL_MONITOR_RETRY:
nca.ndp = ndp;
nca.package = np->id;
nca.channel = nc->id;
nca.type = NCSI_PKT_CMD_GLS;
nca.req_flags = 0;
ret = ncsi_xmit_cmd(&nca);
if (ret)
netdev_err(ndp->ndev.dev, "Error %d sending GLS\n",
ret);
break;
case NCSI_CHANNEL_MONITOR_WAIT ... NCSI_CHANNEL_MONITOR_WAIT_MAX:
break;
default:
netdev_err(ndp->ndev.dev, "NCSI Channel %d timed out!\n",
nc->id);
if (!(ndp->flags & NCSI_DEV_HWA)) {
ncsi_report_link(ndp, true);
ndp->flags |= NCSI_DEV_RESHUFFLE;
}
ncsi_stop_channel_monitor(nc);
ncm = &nc->modes[NCSI_MODE_LINK];
spin_lock_irqsave(&nc->lock, flags);
nc->state = NCSI_CHANNEL_INVISIBLE;
ncm->data[2] &= ~0x1;
spin_unlock_irqrestore(&nc->lock, flags);
spin_lock_irqsave(&ndp->lock, flags);
nc->state = NCSI_CHANNEL_ACTIVE;
list_add_tail_rcu(&nc->link, &ndp->channel_queue);
spin_unlock_irqrestore(&ndp->lock, flags);
ncsi_process_next_channel(ndp);
return;
}
spin_lock_irqsave(&nc->lock, flags);
nc->monitor.state++;
spin_unlock_irqrestore(&nc->lock, flags);
mod_timer(&nc->monitor.timer, jiffies + HZ);
}
void ncsi_start_channel_monitor(struct ncsi_channel *nc)
{
unsigned long flags;
spin_lock_irqsave(&nc->lock, flags);
WARN_ON_ONCE(nc->monitor.enabled);
nc->monitor.enabled = true;
nc->monitor.state = NCSI_CHANNEL_MONITOR_START;
spin_unlock_irqrestore(&nc->lock, flags);
mod_timer(&nc->monitor.timer, jiffies + HZ);
}
void ncsi_stop_channel_monitor(struct ncsi_channel *nc)
{
unsigned long flags;
spin_lock_irqsave(&nc->lock, flags);
if (!nc->monitor.enabled) {
spin_unlock_irqrestore(&nc->lock, flags);
return;
}
nc->monitor.enabled = false;
spin_unlock_irqrestore(&nc->lock, flags);
del_timer_sync(&nc->monitor.timer);
}
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;
nc->monitor.enabled = false;
timer_setup(&nc->monitor.timer, ncsi_channel_monitor, 0);
spin_lock_init(&nc->lock);
INIT_LIST_HEAD(&nc->link);
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;
unsigned long flags;
spin_lock_irqsave(&nc->lock, flags);
/* Release filters */
kfree(nc->mac_filter.addrs);
kfree(nc->vlan_filter.vids);
nc->state = NCSI_CHANNEL_INACTIVE;
spin_unlock_irqrestore(&nc->lock, flags);
ncsi_stop_channel_monitor(nc);
/* 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,
unsigned int req_flags)
{
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; i < limit; i++) {
if (ndp->requests[i].used)
continue;
nr = &ndp->requests[i];
nr->used = true;
nr->flags = req_flags;
ndp->request_id = i + 1;
goto found;
}
/* Fail back to check from the starting cursor */
for (i = NCSI_REQ_START_IDX; i < ndp->request_id; i++) {
if (ndp->requests[i].used)
continue;
nr = &ndp->requests[i];
nr->used = true;
nr->flags = req_flags;
ndp->request_id = i + 1;
goto found;
}
found:
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;
bool driven;
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;
driven = !!(nr->flags & NCSI_REQ_FLAG_EVENT_DRIVEN);
spin_unlock_irqrestore(&ndp->lock, flags);
if (driven && cmd && --ndp->pending_req_num == 0)
schedule_work(&ndp->work);
/* 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(struct timer_list *t)
{
struct ncsi_request *nr = from_timer(nr, t, timer);
struct ncsi_dev_priv *ndp = nr->ndp;
struct ncsi_cmd_pkt *cmd;
struct ncsi_package *np;
struct ncsi_channel *nc;
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);
if (nr->flags == NCSI_REQ_FLAG_NETLINK_DRIVEN) {
if (nr->cmd) {
/* Find the package */
cmd = (struct ncsi_cmd_pkt *)
skb_network_header(nr->cmd);
ncsi_find_package_and_channel(ndp,
cmd->cmd.common.channel,
&np, &nc);
ncsi_send_netlink_timeout(nr, np, nc);
}
}
/* Release the request */
ncsi_free_request(nr);
}
static void ncsi_suspend_channel(struct ncsi_dev_priv *ndp)
{
struct ncsi_dev *nd = &ndp->ndev;
struct ncsi_package *np = ndp->active_package;
struct ncsi_channel *nc = ndp->active_channel;
struct ncsi_cmd_arg nca;
unsigned long flags;
int ret;
nca.ndp = ndp;
nca.req_flags = NCSI_REQ_FLAG_EVENT_DRIVEN;
switch (nd->state) {
case ncsi_dev_state_suspend:
nd->state = ncsi_dev_state_suspend_select;
/* Fall through */
case ncsi_dev_state_suspend_select:
ndp->pending_req_num = 1;
nca.type = NCSI_PKT_CMD_SP;
nca.package = np->id;
nca.channel = NCSI_RESERVED_CHANNEL;
if (ndp->flags & NCSI_DEV_HWA)
nca.bytes[0] = 0;
else
nca.bytes[0] = 1;
/* To retrieve the last link states of channels in current
* package when current active channel needs fail over to
* another one. It means we will possibly select another
* channel as next active one. The link states of channels
* are most important factor of the selection. So we need
* accurate link states. Unfortunately, the link states on
* inactive channels can't be updated with LSC AEN in time.
*/
if (ndp->flags & NCSI_DEV_RESHUFFLE)
nd->state = ncsi_dev_state_suspend_gls;
else
nd->state = ncsi_dev_state_suspend_dcnt;
ret = ncsi_xmit_cmd(&nca);
if (ret)
goto error;
break;
case ncsi_dev_state_suspend_gls:
ndp->pending_req_num = np->channel_num;
nca.type = NCSI_PKT_CMD_GLS;
nca.package = np->id;
nd->state = ncsi_dev_state_suspend_dcnt;
NCSI_FOR_EACH_CHANNEL(np, nc) {
nca.channel = nc->id;
ret = ncsi_xmit_cmd(&nca);
if (ret)
goto error;
}
break;
case ncsi_dev_state_suspend_dcnt:
ndp->pending_req_num = 1;
nca.type = NCSI_PKT_CMD_DCNT;
nca.package = np->id;
nca.channel = nc->id;
nd->state = ncsi_dev_state_suspend_dc;
ret = ncsi_xmit_cmd(&nca);
if (ret)
goto error;
break;
case ncsi_dev_state_suspend_dc:
ndp->pending_req_num = 1;
nca.type = NCSI_PKT_CMD_DC;
nca.package = np->id;
nca.channel = nc->id;
nca.bytes[0] = 1;
nd->state = ncsi_dev_state_suspend_deselect;
ret = ncsi_xmit_cmd(&nca);
if (ret)
goto error;
break;
case ncsi_dev_state_suspend_deselect:
ndp->pending_req_num = 1;
nca.type = NCSI_PKT_CMD_DP;
nca.package = np->id;
nca.channel = NCSI_RESERVED_CHANNEL;
nd->state = ncsi_dev_state_suspend_done;
ret = ncsi_xmit_cmd(&nca);
if (ret)
goto error;
break;
case ncsi_dev_state_suspend_done:
spin_lock_irqsave(&nc->lock, flags);
nc->state = NCSI_CHANNEL_INACTIVE;
spin_unlock_irqrestore(&nc->lock, flags);
ncsi_process_next_channel(ndp);
break;
default:
netdev_warn(nd->dev, "Wrong NCSI state 0x%x in suspend\n",
nd->state);
}
return;
error:
nd->state = ncsi_dev_state_functional;
}
/* Check the VLAN filter bitmap for a set filter, and construct a
* "Set VLAN Filter - Disable" packet if found.
*/
static int clear_one_vid(struct ncsi_dev_priv *ndp, struct ncsi_channel *nc,
struct ncsi_cmd_arg *nca)
{
struct ncsi_channel_vlan_filter *ncf;
unsigned long flags;
void *bitmap;
int index;
u16 vid;
ncf = &nc->vlan_filter;
bitmap = &ncf->bitmap;
spin_lock_irqsave(&nc->lock, flags);
index = find_next_bit(bitmap, ncf->n_vids, 0);
if (index >= ncf->n_vids) {
spin_unlock_irqrestore(&nc->lock, flags);
return -1;
}
vid = ncf->vids[index];
clear_bit(index, bitmap);
ncf->vids[index] = 0;
spin_unlock_irqrestore(&nc->lock, flags);
nca->type = NCSI_PKT_CMD_SVF;
nca->words[1] = vid;
/* HW filter index starts at 1 */
nca->bytes[6] = index + 1;
nca->bytes[7] = 0x00;
return 0;
}
/* Find an outstanding VLAN tag and constuct a "Set VLAN Filter - Enable"
* packet.
*/
static int set_one_vid(struct ncsi_dev_priv *ndp, struct ncsi_channel *nc,
struct ncsi_cmd_arg *nca)
{
struct ncsi_channel_vlan_filter *ncf;
struct vlan_vid *vlan = NULL;
unsigned long flags;
int i, index;
void *bitmap;
u16 vid;
if (list_empty(&ndp->vlan_vids))
return -1;
ncf = &nc->vlan_filter;
bitmap = &ncf->bitmap;
spin_lock_irqsave(&nc->lock, flags);
rcu_read_lock();
list_for_each_entry_rcu(vlan, &ndp->vlan_vids, list) {
vid = vlan->vid;
for (i = 0; i < ncf->n_vids; i++)
if (ncf->vids[i] == vid) {
vid = 0;
break;
}
if (vid)
break;
}
rcu_read_unlock();
if (!vid) {
/* No VLAN ID is not set */
spin_unlock_irqrestore(&nc->lock, flags);
return -1;
}
index = find_next_zero_bit(bitmap, ncf->n_vids, 0);
if (index < 0 || index >= ncf->n_vids) {
netdev_err(ndp->ndev.dev,
"Channel %u already has all VLAN filters set\n",
nc->id);
spin_unlock_irqrestore(&nc->lock, flags);
return -1;
}
ncf->vids[index] = vid;
set_bit(index, bitmap);
spin_unlock_irqrestore(&nc->lock, flags);
nca->type = NCSI_PKT_CMD_SVF;
nca->words[1] = vid;
/* HW filter index starts at 1 */
nca->bytes[6] = index + 1;
nca->bytes[7] = 0x01;
return 0;
}
static void ncsi_configure_channel(struct ncsi_dev_priv *ndp)
{
struct ncsi_dev *nd = &ndp->ndev;
struct net_device *dev = nd->dev;
struct ncsi_package *np = ndp->active_package;
struct ncsi_channel *nc = ndp->active_channel;
struct ncsi_channel *hot_nc = NULL;
struct ncsi_cmd_arg nca;
unsigned char index;
unsigned long flags;
int ret;
nca.ndp = ndp;
nca.req_flags = NCSI_REQ_FLAG_EVENT_DRIVEN;
switch (nd->state) {
case ncsi_dev_state_config:
case ncsi_dev_state_config_sp:
ndp->pending_req_num = 1;
/* Select the specific package */
nca.type = NCSI_PKT_CMD_SP;
if (ndp->flags & NCSI_DEV_HWA)
nca.bytes[0] = 0;
else
nca.bytes[0] = 1;
nca.package = np->id;
nca.channel = NCSI_RESERVED_CHANNEL;
ret = ncsi_xmit_cmd(&nca);
if (ret) {
netdev_err(ndp->ndev.dev,
"NCSI: Failed to transmit CMD_SP\n");
goto error;
}
nd->state = ncsi_dev_state_config_cis;
break;
case ncsi_dev_state_config_cis:
ndp->pending_req_num = 1;
/* Clear initial state */
nca.type = NCSI_PKT_CMD_CIS;
nca.package = np->id;
nca.channel = nc->id;
ret = ncsi_xmit_cmd(&nca);
if (ret) {
netdev_err(ndp->ndev.dev,
"NCSI: Failed to transmit CMD_CIS\n");
goto error;
}
nd->state = ncsi_dev_state_config_clear_vids;
break;
case ncsi_dev_state_config_clear_vids:
case ncsi_dev_state_config_svf:
case ncsi_dev_state_config_ev:
case ncsi_dev_state_config_sma:
case ncsi_dev_state_config_ebf:
#if IS_ENABLED(CONFIG_IPV6)
case ncsi_dev_state_config_egmf:
#endif
case ncsi_dev_state_config_ecnt:
case ncsi_dev_state_config_ec:
case ncsi_dev_state_config_ae:
case ncsi_dev_state_config_gls:
ndp->pending_req_num = 1;
nca.package = np->id;
nca.channel = nc->id;
/* Clear any active filters on the channel before setting */
if (nd->state == ncsi_dev_state_config_clear_vids) {
ret = clear_one_vid(ndp, nc, &nca);
if (ret) {
nd->state = ncsi_dev_state_config_svf;
schedule_work(&ndp->work);
break;
}
/* Repeat */
nd->state = ncsi_dev_state_config_clear_vids;
/* Add known VLAN tags to the filter */
} else if (nd->state == ncsi_dev_state_config_svf) {
ret = set_one_vid(ndp, nc, &nca);
if (ret) {
nd->state = ncsi_dev_state_config_ev;
schedule_work(&ndp->work);
break;
}
/* Repeat */
nd->state = ncsi_dev_state_config_svf;
/* Enable/Disable the VLAN filter */
} else if (nd->state == ncsi_dev_state_config_ev) {
if (list_empty(&ndp->vlan_vids)) {
nca.type = NCSI_PKT_CMD_DV;
} else {
nca.type = NCSI_PKT_CMD_EV;
nca.bytes[3] = NCSI_CAP_VLAN_NO;
}
nd->state = ncsi_dev_state_config_sma;
} else if (nd->state == ncsi_dev_state_config_sma) {
/* Use first entry in unicast filter table. Note that
* the MAC filter table starts from entry 1 instead of
* 0.
*/
nca.type = NCSI_PKT_CMD_SMA;
for (index = 0; index < 6; index++)
nca.bytes[index] = dev->dev_addr[index];
nca.bytes[6] = 0x1;
nca.bytes[7] = 0x1;
nd->state = ncsi_dev_state_config_ebf;
} else if (nd->state == ncsi_dev_state_config_ebf) {
nca.type = NCSI_PKT_CMD_EBF;
nca.dwords[0] = nc->caps[NCSI_CAP_BC].cap;
nd->state = ncsi_dev_state_config_ecnt;
#if IS_ENABLED(CONFIG_IPV6)
if (ndp->inet6_addr_num > 0 &&
(nc->caps[NCSI_CAP_GENERIC].cap &
NCSI_CAP_GENERIC_MC))
nd->state = ncsi_dev_state_config_egmf;
else
nd->state = ncsi_dev_state_config_ecnt;
} else if (nd->state == ncsi_dev_state_config_egmf) {
nca.type = NCSI_PKT_CMD_EGMF;
nca.dwords[0] = nc->caps[NCSI_CAP_MC].cap;
nd->state = ncsi_dev_state_config_ecnt;
#endif /* CONFIG_IPV6 */
} else if (nd->state == ncsi_dev_state_config_ecnt) {
nca.type = NCSI_PKT_CMD_ECNT;
nd->state = ncsi_dev_state_config_ec;
} else if (nd->state == ncsi_dev_state_config_ec) {
/* Enable AEN if it's supported */
nca.type = NCSI_PKT_CMD_EC;
nd->state = ncsi_dev_state_config_ae;
if (!(nc->caps[NCSI_CAP_AEN].cap & NCSI_CAP_AEN_MASK))
nd->state = ncsi_dev_state_config_gls;
} else if (nd->state == ncsi_dev_state_config_ae) {
nca.type = NCSI_PKT_CMD_AE;
nca.bytes[0] = 0;
nca.dwords[1] = nc->caps[NCSI_CAP_AEN].cap;
nd->state = ncsi_dev_state_config_gls;
} else if (nd->state == ncsi_dev_state_config_gls) {
nca.type = NCSI_PKT_CMD_GLS;
nd->state = ncsi_dev_state_config_done;
}
ret = ncsi_xmit_cmd(&nca);
if (ret) {
netdev_err(ndp->ndev.dev,
"NCSI: Failed to transmit CMD %x\n",
nca.type);
goto error;
}
break;
case ncsi_dev_state_config_done:
netdev_dbg(ndp->ndev.dev, "NCSI: channel %u config done\n",
nc->id);
spin_lock_irqsave(&nc->lock, flags);
if (nc->reconfigure_needed) {
/* This channel's configuration has been updated
* part-way during the config state - start the
* channel configuration over
*/
nc->reconfigure_needed = false;
nc->state = NCSI_CHANNEL_INACTIVE;
spin_unlock_irqrestore(&nc->lock, flags);
spin_lock_irqsave(&ndp->lock, flags);
list_add_tail_rcu(&nc->link, &ndp->channel_queue);
spin_unlock_irqrestore(&ndp->lock, flags);
netdev_dbg(dev, "Dirty NCSI channel state reset\n");
ncsi_process_next_channel(ndp);
break;
}
if (nc->modes[NCSI_MODE_LINK].data[2] & 0x1) {
hot_nc = nc;
nc->state = NCSI_CHANNEL_ACTIVE;
} else {
hot_nc = NULL;
nc->state = NCSI_CHANNEL_INACTIVE;
netdev_dbg(ndp->ndev.dev,
"NCSI: channel %u link down after config\n",
nc->id);
}
spin_unlock_irqrestore(&nc->lock, flags);
/* Update the hot channel */
spin_lock_irqsave(&ndp->lock, flags);
ndp->hot_channel = hot_nc;
spin_unlock_irqrestore(&ndp->lock, flags);
ncsi_start_channel_monitor(nc);
ncsi_process_next_channel(ndp);
break;
default:
netdev_alert(dev, "Wrong NCSI state 0x%x in config\n",
nd->state);
}
return;
error:
ncsi_report_link(ndp, true);
}
static int ncsi_choose_active_channel(struct ncsi_dev_priv *ndp)
{
struct ncsi_package *np, *force_package;
struct ncsi_channel *nc, *found, *hot_nc, *force_channel;
struct ncsi_channel_mode *ncm;
unsigned long flags;
spin_lock_irqsave(&ndp->lock, flags);
hot_nc = ndp->hot_channel;
force_channel = ndp->force_channel;
force_package = ndp->force_package;
spin_unlock_irqrestore(&ndp->lock, flags);
/* Force a specific channel whether or not it has link if we have been
* configured to do so
*/
if (force_package && force_channel) {
found = force_channel;
ncm = &found->modes[NCSI_MODE_LINK];
if (!(ncm->data[2] & 0x1))
netdev_info(ndp->ndev.dev,
"NCSI: Channel %u forced, but it is link down\n",
found->id);
goto out;
}
/* The search is done once an inactive channel with up
* link is found.
*/
found = NULL;
NCSI_FOR_EACH_PACKAGE(ndp, np) {
if (ndp->force_package && np != ndp->force_package)
continue;
NCSI_FOR_EACH_CHANNEL(np, nc) {
spin_lock_irqsave(&nc->lock, flags);
if (!list_empty(&nc->link) ||
nc->state != NCSI_CHANNEL_INACTIVE) {
spin_unlock_irqrestore(&nc->lock, flags);
continue;
}
if (!found)
found = nc;
if (nc == hot_nc)
found = nc;
ncm = &nc->modes[NCSI_MODE_LINK];
if (ncm->data[2] & 0x1) {
spin_unlock_irqrestore(&nc->lock, flags);
found = nc;
goto out;
}
spin_unlock_irqrestore(&nc->lock, flags);
}
}
if (!found) {
netdev_warn(ndp->ndev.dev,
"NCSI: No channel found with link\n");
ncsi_report_link(ndp, true);
return -ENODEV;
}
ncm = &found->modes[NCSI_MODE_LINK];
netdev_dbg(ndp->ndev.dev,
"NCSI: Channel %u added to queue (link %s)\n",
found->id, ncm->data[2] & 0x1 ? "up" : "down");
out:
spin_lock_irqsave(&ndp->lock, flags);
list_add_tail_rcu(&found->link, &ndp->channel_queue);
spin_unlock_irqrestore(&ndp->lock, flags);
return ncsi_process_next_channel(ndp);
}
static bool ncsi_check_hwa(struct ncsi_dev_priv *ndp)
{
struct ncsi_package *np;
struct ncsi_channel *nc;
unsigned int cap;
bool has_channel = false;
/* The hardware arbitration is disabled if any one channel
* doesn't support explicitly.
*/
NCSI_FOR_EACH_PACKAGE(ndp, np) {
NCSI_FOR_EACH_CHANNEL(np, nc) {
has_channel = true;
cap = nc->caps[NCSI_CAP_GENERIC].cap;
if (!(cap & NCSI_CAP_GENERIC_HWA) ||
(cap & NCSI_CAP_GENERIC_HWA_MASK) !=
NCSI_CAP_GENERIC_HWA_SUPPORT) {
ndp->flags &= ~NCSI_DEV_HWA;
return false;
}
}
}
if (has_channel) {
ndp->flags |= NCSI_DEV_HWA;
return true;
}
ndp->flags &= ~NCSI_DEV_HWA;
return false;
}
static int ncsi_enable_hwa(struct ncsi_dev_priv *ndp)
{
struct ncsi_package *np;
struct ncsi_channel *nc;
unsigned long flags;
/* Move all available channels to processing queue */
spin_lock_irqsave(&ndp->lock, flags);
NCSI_FOR_EACH_PACKAGE(ndp, np) {
NCSI_FOR_EACH_CHANNEL(np, nc) {
WARN_ON_ONCE(nc->state != NCSI_CHANNEL_INACTIVE ||
!list_empty(&nc->link));
ncsi_stop_channel_monitor(nc);
list_add_tail_rcu(&nc->link, &ndp->channel_queue);
}
}
spin_unlock_irqrestore(&ndp->lock, flags);
/* We can have no channels in extremely case */
if (list_empty(&ndp->channel_queue)) {
netdev_err(ndp->ndev.dev,
"NCSI: No available channels for HWA\n");
ncsi_report_link(ndp, false);
return -ENOENT;
}
return ncsi_process_next_channel(ndp);
}
static void ncsi_probe_channel(struct ncsi_dev_priv *ndp)
{
struct ncsi_dev *nd = &ndp->ndev;
struct ncsi_package *np;
struct ncsi_channel *nc;
struct ncsi_cmd_arg nca;
unsigned char index;
int ret;
nca.ndp = ndp;
nca.req_flags = NCSI_REQ_FLAG_EVENT_DRIVEN;
switch (nd->state) {
case ncsi_dev_state_probe:
nd->state = ncsi_dev_state_probe_deselect;
/* Fall through */
case ncsi_dev_state_probe_deselect:
ndp->pending_req_num = 8;
/* Deselect all possible packages */
nca.type = NCSI_PKT_CMD_DP;
nca.channel = NCSI_RESERVED_CHANNEL;
for (index = 0; index < 8; index++) {
nca.package = index;
ret = ncsi_xmit_cmd(&nca);
if (ret)
goto error;
}
nd->state = ncsi_dev_state_probe_package;
break;
case ncsi_dev_state_probe_package:
ndp->pending_req_num = 16;
/* Select all possible packages */
nca.type = NCSI_PKT_CMD_SP;
nca.bytes[0] = 1;
nca.channel = NCSI_RESERVED_CHANNEL;
for (index = 0; index < 8; index++) {
nca.package = index;
ret = ncsi_xmit_cmd(&nca);
if (ret)
goto error;
}
/* Disable all possible packages */
nca.type = NCSI_PKT_CMD_DP;
for (index = 0; index < 8; index++) {
nca.package = index;
ret = ncsi_xmit_cmd(&nca);
if (ret)
goto error;
}
nd->state = ncsi_dev_state_probe_channel;
break;
case ncsi_dev_state_probe_channel:
if (!ndp->active_package)
ndp->active_package = list_first_or_null_rcu(
&ndp->packages, struct ncsi_package, node);
else if (list_is_last(&ndp->active_package->node,
&ndp->packages))
ndp->active_package = NULL;
else
ndp->active_package = list_next_entry(
ndp->active_package, node);
/* All available packages and channels are enumerated. The
* enumeration happens for once when the NCSI interface is
* started. So we need continue to start the interface after
* the enumeration.
*
* We have to choose an active channel before configuring it.
* Note that we possibly don't have active channel in extreme
* situation.
*/
if (!ndp->active_package) {
ndp->flags |= NCSI_DEV_PROBED;
if (ncsi_check_hwa(ndp))
ncsi_enable_hwa(ndp);
else
ncsi_choose_active_channel(ndp);
return;
}
/* Select the active package */
ndp->pending_req_num = 1;
nca.type = NCSI_PKT_CMD_SP;
nca.bytes[0] = 1;
nca.package = ndp->active_package->id;
nca.channel = NCSI_RESERVED_CHANNEL;
ret = ncsi_xmit_cmd(&nca);
if (ret)
goto error;
nd->state = ncsi_dev_state_probe_cis;
break;
case ncsi_dev_state_probe_cis:
ndp->pending_req_num = NCSI_RESERVED_CHANNEL;
/* Clear initial state */
nca.type = NCSI_PKT_CMD_CIS;
nca.package = ndp->active_package->id;
for (index = 0; index < NCSI_RESERVED_CHANNEL; index++) {
nca.channel = index;
ret = ncsi_xmit_cmd(&nca);
if (ret)
goto error;
}
nd->state = ncsi_dev_state_probe_gvi;
break;
case ncsi_dev_state_probe_gvi:
case ncsi_dev_state_probe_gc:
case ncsi_dev_state_probe_gls:
np = ndp->active_package;
ndp->pending_req_num = np->channel_num;
/* Retrieve version, capability or link status */
if (nd->state == ncsi_dev_state_probe_gvi)
nca.type = NCSI_PKT_CMD_GVI;
else if (nd->state == ncsi_dev_state_probe_gc)
nca.type = NCSI_PKT_CMD_GC;
else
nca.type = NCSI_PKT_CMD_GLS;
nca.package = np->id;
NCSI_FOR_EACH_CHANNEL(np, nc) {
nca.channel = nc->id;
ret = ncsi_xmit_cmd(&nca);
if (ret)
goto error;
}
if (nd->state == ncsi_dev_state_probe_gvi)
nd->state = ncsi_dev_state_probe_gc;
else if (nd->state == ncsi_dev_state_probe_gc)
nd->state = ncsi_dev_state_probe_gls;
else
nd->state = ncsi_dev_state_probe_dp;
break;
case ncsi_dev_state_probe_dp:
ndp->pending_req_num = 1;
/* Deselect the active package */
nca.type = NCSI_PKT_CMD_DP;
nca.package = ndp->active_package->id;
nca.channel = NCSI_RESERVED_CHANNEL;
ret = ncsi_xmit_cmd(&nca);
if (ret)
goto error;
/* Scan channels in next package */
nd->state = ncsi_dev_state_probe_channel;
break;
default:
netdev_warn(nd->dev, "Wrong NCSI state 0x%0x in enumeration\n",
nd->state);
}
return;
error:
netdev_err(ndp->ndev.dev,
"NCSI: Failed to transmit cmd 0x%x during probe\n",
nca.type);
ncsi_report_link(ndp, true);
}
static void ncsi_dev_work(struct work_struct *work)
{
struct ncsi_dev_priv *ndp = container_of(work,
struct ncsi_dev_priv, work);
struct ncsi_dev *nd = &ndp->ndev;
switch (nd->state & ncsi_dev_state_major) {
case ncsi_dev_state_probe:
ncsi_probe_channel(ndp);
break;
case ncsi_dev_state_suspend:
ncsi_suspend_channel(ndp);
break;
case ncsi_dev_state_config:
ncsi_configure_channel(ndp);
break;
default:
netdev_warn(nd->dev, "Wrong NCSI state 0x%x in workqueue\n",
nd->state);
}
}
int ncsi_process_next_channel(struct ncsi_dev_priv *ndp)
{
struct ncsi_channel *nc;
int old_state;
unsigned long flags;
spin_lock_irqsave(&ndp->lock, flags);
nc = list_first_or_null_rcu(&ndp->channel_queue,
struct ncsi_channel, link);
if (!nc) {
spin_unlock_irqrestore(&ndp->lock, flags);
goto out;
}
list_del_init(&nc->link);
spin_unlock_irqrestore(&ndp->lock, flags);
spin_lock_irqsave(&nc->lock, flags);
old_state = nc->state;
nc->state = NCSI_CHANNEL_INVISIBLE;
spin_unlock_irqrestore(&nc->lock, flags);
ndp->active_channel = nc;
ndp->active_package = nc->package;
switch (old_state) {
case NCSI_CHANNEL_INACTIVE:
ndp->ndev.state = ncsi_dev_state_config;
netdev_dbg(ndp->ndev.dev, "NCSI: configuring channel %u\n",
nc->id);
ncsi_configure_channel(ndp);
break;
case NCSI_CHANNEL_ACTIVE:
ndp->ndev.state = ncsi_dev_state_suspend;
netdev_dbg(ndp->ndev.dev, "NCSI: suspending channel %u\n",
nc->id);
ncsi_suspend_channel(ndp);
break;
default:
netdev_err(ndp->ndev.dev, "Invalid state 0x%x on %d:%d\n",
old_state, nc->package->id, nc->id);
ncsi_report_link(ndp, false);
return -EINVAL;
}
return 0;
out:
ndp->active_channel = NULL;
ndp->active_package = NULL;
if (ndp->flags & NCSI_DEV_RESHUFFLE) {
ndp->flags &= ~NCSI_DEV_RESHUFFLE;
return ncsi_choose_active_channel(ndp);
}
ncsi_report_link(ndp, false);
return -ENODEV;
}
#if IS_ENABLED(CONFIG_IPV6)
static int ncsi_inet6addr_event(struct notifier_block *this,
unsigned long event, void *data)
{
struct inet6_ifaddr *ifa = data;
struct net_device *dev = ifa->idev->dev;
struct ncsi_dev *nd = ncsi_find_dev(dev);
struct ncsi_dev_priv *ndp = nd ? TO_NCSI_DEV_PRIV(nd) : NULL;
struct ncsi_package *np;
struct ncsi_channel *nc;
struct ncsi_cmd_arg nca;
bool action;
int ret;
if (!ndp || (ipv6_addr_type(&ifa->addr) &
(IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK)))
return NOTIFY_OK;
switch (event) {
case NETDEV_UP:
action = (++ndp->inet6_addr_num) == 1;
nca.type = NCSI_PKT_CMD_EGMF;
break;
case NETDEV_DOWN:
action = (--ndp->inet6_addr_num == 0);
nca.type = NCSI_PKT_CMD_DGMF;
break;
default:
return NOTIFY_OK;
}
/* We might not have active channel or packages. The IPv6
* required multicast will be enabled when active channel
* or packages are chosen.
*/
np = ndp->active_package;
nc = ndp->active_channel;
if (!action || !np || !nc)
return NOTIFY_OK;
/* We needn't enable or disable it if the function isn't supported */
if (!(nc->caps[NCSI_CAP_GENERIC].cap & NCSI_CAP_GENERIC_MC))
return NOTIFY_OK;
nca.ndp = ndp;
nca.req_flags = 0;
nca.package = np->id;
nca.channel = nc->id;
nca.dwords[0] = nc->caps[NCSI_CAP_MC].cap;
ret = ncsi_xmit_cmd(&nca);
if (ret) {
netdev_warn(dev, "Fail to %s global multicast filter (%d)\n",
(event == NETDEV_UP) ? "enable" : "disable", ret);
return NOTIFY_DONE;
}
return NOTIFY_OK;
}
static struct notifier_block ncsi_inet6addr_notifier = {
.notifier_call = ncsi_inet6addr_event,
};
#endif /* CONFIG_IPV6 */
static int ncsi_kick_channels(struct ncsi_dev_priv *ndp)
{
struct ncsi_dev *nd = &ndp->ndev;
struct ncsi_channel *nc;
struct ncsi_package *np;
unsigned long flags;
unsigned int n = 0;
NCSI_FOR_EACH_PACKAGE(ndp, np) {
NCSI_FOR_EACH_CHANNEL(np, nc) {
spin_lock_irqsave(&nc->lock, flags);
/* Channels may be busy, mark dirty instead of
* kicking if;
* a) not ACTIVE (configured)
* b) in the channel_queue (to be configured)
* c) it's ndev is in the config state
*/
if (nc->state != NCSI_CHANNEL_ACTIVE) {
if ((ndp->ndev.state & 0xff00) ==
ncsi_dev_state_config ||
!list_empty(&nc->link)) {
netdev_dbg(nd->dev,
"NCSI: channel %p marked dirty\n",
nc);
nc->reconfigure_needed = true;
}
spin_unlock_irqrestore(&nc->lock, flags);
continue;
}
spin_unlock_irqrestore(&nc->lock, flags);
ncsi_stop_channel_monitor(nc);
spin_lock_irqsave(&nc->lock, flags);
nc->state = NCSI_CHANNEL_INACTIVE;
spin_unlock_irqrestore(&nc->lock, flags);
spin_lock_irqsave(&ndp->lock, flags);
list_add_tail_rcu(&nc->link, &ndp->channel_queue);
spin_unlock_irqrestore(&ndp->lock, flags);
netdev_dbg(nd->dev, "NCSI: kicked channel %p\n", nc);
n++;
}
}
return n;
}
int ncsi_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
{
struct ncsi_dev_priv *ndp;
unsigned int n_vids = 0;
struct vlan_vid *vlan;
struct ncsi_dev *nd;
bool found = false;
if (vid == 0)
return 0;
nd = ncsi_find_dev(dev);
if (!nd) {
netdev_warn(dev, "NCSI: No net_device?\n");
return 0;
}
ndp = TO_NCSI_DEV_PRIV(nd);
/* Add the VLAN id to our internal list */
list_for_each_entry_rcu(vlan, &ndp->vlan_vids, list) {
n_vids++;
if (vlan->vid == vid) {
netdev_dbg(dev, "NCSI: vid %u already registered\n",
vid);
return 0;
}
}
if (n_vids >= NCSI_MAX_VLAN_VIDS) {
netdev_warn(dev,
"tried to add vlan id %u but NCSI max already registered (%u)\n",
vid, NCSI_MAX_VLAN_VIDS);
return -ENOSPC;
}
vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
if (!vlan)
return -ENOMEM;
vlan->proto = proto;
vlan->vid = vid;
list_add_rcu(&vlan->list, &ndp->vlan_vids);
netdev_dbg(dev, "NCSI: Added new vid %u\n", vid);
found = ncsi_kick_channels(ndp) != 0;
return found ? ncsi_process_next_channel(ndp) : 0;
}
EXPORT_SYMBOL_GPL(ncsi_vlan_rx_add_vid);
int ncsi_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, u16 vid)
{
struct vlan_vid *vlan, *tmp;
struct ncsi_dev_priv *ndp;
struct ncsi_dev *nd;
bool found = false;
if (vid == 0)
return 0;
nd = ncsi_find_dev(dev);
if (!nd) {
netdev_warn(dev, "NCSI: no net_device?\n");
return 0;
}
ndp = TO_NCSI_DEV_PRIV(nd);
/* Remove the VLAN id from our internal list */
list_for_each_entry_safe(vlan, tmp, &ndp->vlan_vids, list)
if (vlan->vid == vid) {
netdev_dbg(dev, "NCSI: vid %u found, removing\n", vid);
list_del_rcu(&vlan->list);
found = true;
kfree(vlan);
}
if (!found) {
netdev_err(dev, "NCSI: vid %u wasn't registered!\n", vid);
return -EINVAL;
}
found = ncsi_kick_channels(ndp) != 0;
return found ? ncsi_process_next_channel(ndp) : 0;
}
EXPORT_SYMBOL_GPL(ncsi_vlan_rx_kill_vid);
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;
ndp->pending_req_num = 0;
INIT_LIST_HEAD(&ndp->channel_queue);
INIT_LIST_HEAD(&ndp->vlan_vids);
INIT_WORK(&ndp->work, ncsi_dev_work);
/* Initialize private NCSI device */
spin_lock_init(&ndp->lock);
INIT_LIST_HEAD(&ndp->packages);
ndp->request_id = NCSI_REQ_START_IDX;
for (i = 0; i < ARRAY_SIZE(ndp->requests); i++) {
ndp->requests[i].id = i;
ndp->requests[i].ndp = ndp;
timer_setup(&ndp->requests[i].timer, ncsi_request_timeout, 0);
}
spin_lock_irqsave(&ncsi_dev_lock, flags);
#if IS_ENABLED(CONFIG_IPV6)
ndp->inet6_addr_num = 0;
if (list_empty(&ncsi_dev_list))
register_inet6addr_notifier(&ncsi_inet6addr_notifier);
#endif
list_add_tail_rcu(&ndp->node, &ncsi_dev_list);
spin_unlock_irqrestore(&ncsi_dev_lock, flags);
/* Register NCSI packet Rx handler */
ndp->ptype.type = cpu_to_be16(ETH_P_NCSI);
ndp->ptype.func = ncsi_rcv_rsp;
ndp->ptype.dev = dev;
dev_add_pack(&ndp->ptype);
/* Set up generic netlink interface */
ncsi_init_netlink(dev);
return nd;
}
EXPORT_SYMBOL_GPL(ncsi_register_dev);
int ncsi_start_dev(struct ncsi_dev *nd)
{
struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
int ret;
if (nd->state != ncsi_dev_state_registered &&
nd->state != ncsi_dev_state_functional)
return -ENOTTY;
if (!(ndp->flags & NCSI_DEV_PROBED)) {
nd->state = ncsi_dev_state_probe;
schedule_work(&ndp->work);
return 0;
}
if (ndp->flags & NCSI_DEV_HWA) {
netdev_info(ndp->ndev.dev, "NCSI: Enabling HWA mode\n");
ret = ncsi_enable_hwa(ndp);
} else {
ret = ncsi_choose_active_channel(ndp);
}
return ret;
}
EXPORT_SYMBOL_GPL(ncsi_start_dev);
void ncsi_stop_dev(struct ncsi_dev *nd)
{
struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
struct ncsi_package *np;
struct ncsi_channel *nc;
bool chained;
int old_state;
unsigned long flags;
/* Stop the channel monitor and reset channel's state */
NCSI_FOR_EACH_PACKAGE(ndp, np) {
NCSI_FOR_EACH_CHANNEL(np, nc) {
ncsi_stop_channel_monitor(nc);
spin_lock_irqsave(&nc->lock, flags);
chained = !list_empty(&nc->link);
old_state = nc->state;
nc->state = NCSI_CHANNEL_INACTIVE;
spin_unlock_irqrestore(&nc->lock, flags);
WARN_ON_ONCE(chained ||
old_state == NCSI_CHANNEL_INVISIBLE);
}
}
netdev_dbg(ndp->ndev.dev, "NCSI: Stopping device\n");
ncsi_report_link(ndp, true);
}
EXPORT_SYMBOL_GPL(ncsi_stop_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;
dev_remove_pack(&ndp->ptype);
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);
#if IS_ENABLED(CONFIG_IPV6)
if (list_empty(&ncsi_dev_list))
unregister_inet6addr_notifier(&ncsi_inet6addr_notifier);
#endif
spin_unlock_irqrestore(&ncsi_dev_lock, flags);
ncsi_unregister_netlink(nd->dev);
kfree(ndp);
}
EXPORT_SYMBOL_GPL(ncsi_unregister_dev);
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