1326 lines
31 KiB
C
1326 lines
31 KiB
C
/*
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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 <net/addrconf.h>
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#include <net/ipv6.h>
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#include <net/if_inet6.h>
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#include "internal.h"
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#include "ncsi-pkt.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;
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unsigned long flags;
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ncf = nc->filters[table];
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if (!ncf)
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return -ENXIO;
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size = ncsi_filter_size(table);
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if (size < 0)
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return size;
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spin_lock_irqsave(&nc->lock, flags);
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bitmap = (void *)&ncf->bitmap;
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index = -1;
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while ((index = find_next_bit(bitmap, ncf->total, index + 1))
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< ncf->total) {
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if (!memcmp(ncf->data + size * index, data, size)) {
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spin_unlock_irqrestore(&nc->lock, flags);
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return index;
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}
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}
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spin_unlock_irqrestore(&nc->lock, flags);
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return -ENOENT;
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}
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int ncsi_add_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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int index, size;
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void *bitmap;
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unsigned long flags;
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size = ncsi_filter_size(table);
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if (size < 0)
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return size;
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index = ncsi_find_filter(nc, table, data);
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if (index >= 0)
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return index;
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ncf = nc->filters[table];
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if (!ncf)
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return -ENODEV;
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spin_lock_irqsave(&nc->lock, flags);
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bitmap = (void *)&ncf->bitmap;
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do {
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index = find_next_zero_bit(bitmap, ncf->total, 0);
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if (index >= ncf->total) {
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spin_unlock_irqrestore(&nc->lock, flags);
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return -ENOSPC;
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}
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} while (test_and_set_bit(index, bitmap));
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memcpy(ncf->data + size * index, data, size);
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spin_unlock_irqrestore(&nc->lock, flags);
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return index;
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}
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int ncsi_remove_filter(struct ncsi_channel *nc, int table, int index)
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{
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struct ncsi_channel_filter *ncf;
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int size;
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void *bitmap;
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unsigned long flags;
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size = ncsi_filter_size(table);
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if (size < 0)
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return size;
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ncf = nc->filters[table];
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if (!ncf || index >= ncf->total)
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return -ENODEV;
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spin_lock_irqsave(&nc->lock, flags);
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bitmap = (void *)&ncf->bitmap;
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if (test_and_clear_bit(index, bitmap))
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memset(ncf->data + size * index, 0, size);
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spin_unlock_irqrestore(&nc->lock, flags);
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return 0;
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}
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static void ncsi_report_link(struct ncsi_dev_priv *ndp, bool force_down)
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{
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struct ncsi_dev *nd = &ndp->ndev;
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struct ncsi_package *np;
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struct ncsi_channel *nc;
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unsigned long flags;
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nd->state = ncsi_dev_state_functional;
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if (force_down) {
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nd->link_up = 0;
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goto report;
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}
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nd->link_up = 0;
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NCSI_FOR_EACH_PACKAGE(ndp, np) {
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NCSI_FOR_EACH_CHANNEL(np, nc) {
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spin_lock_irqsave(&nc->lock, flags);
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if (!list_empty(&nc->link) ||
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nc->state != NCSI_CHANNEL_ACTIVE) {
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spin_unlock_irqrestore(&nc->lock, flags);
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continue;
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}
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if (nc->modes[NCSI_MODE_LINK].data[2] & 0x1) {
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spin_unlock_irqrestore(&nc->lock, flags);
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nd->link_up = 1;
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goto report;
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}
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spin_unlock_irqrestore(&nc->lock, flags);
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}
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}
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report:
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nd->handler(nd);
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}
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static void ncsi_channel_monitor(unsigned long data)
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{
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struct ncsi_channel *nc = (struct ncsi_channel *)data;
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struct ncsi_package *np = nc->package;
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struct ncsi_dev_priv *ndp = np->ndp;
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struct ncsi_cmd_arg nca;
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bool enabled, chained;
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unsigned int monitor_state;
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unsigned long flags;
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int state, ret;
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spin_lock_irqsave(&nc->lock, flags);
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state = nc->state;
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chained = !list_empty(&nc->link);
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enabled = nc->monitor.enabled;
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monitor_state = nc->monitor.state;
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spin_unlock_irqrestore(&nc->lock, flags);
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if (!enabled || chained)
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return;
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if (state != NCSI_CHANNEL_INACTIVE &&
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state != NCSI_CHANNEL_ACTIVE)
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return;
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switch (monitor_state) {
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case NCSI_CHANNEL_MONITOR_START:
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case NCSI_CHANNEL_MONITOR_RETRY:
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nca.ndp = ndp;
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nca.package = np->id;
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nca.channel = nc->id;
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nca.type = NCSI_PKT_CMD_GLS;
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nca.req_flags = 0;
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ret = ncsi_xmit_cmd(&nca);
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if (ret) {
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netdev_err(ndp->ndev.dev, "Error %d sending GLS\n",
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ret);
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return;
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}
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break;
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case NCSI_CHANNEL_MONITOR_WAIT ... NCSI_CHANNEL_MONITOR_WAIT_MAX:
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break;
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default:
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if (!(ndp->flags & NCSI_DEV_HWA) &&
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state == NCSI_CHANNEL_ACTIVE) {
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ncsi_report_link(ndp, true);
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ndp->flags |= NCSI_DEV_RESHUFFLE;
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}
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spin_lock_irqsave(&nc->lock, flags);
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nc->state = NCSI_CHANNEL_INVISIBLE;
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spin_unlock_irqrestore(&nc->lock, flags);
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spin_lock_irqsave(&ndp->lock, flags);
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nc->state = NCSI_CHANNEL_INACTIVE;
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list_add_tail_rcu(&nc->link, &ndp->channel_queue);
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spin_unlock_irqrestore(&ndp->lock, flags);
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ncsi_process_next_channel(ndp);
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return;
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}
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spin_lock_irqsave(&nc->lock, flags);
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nc->monitor.state++;
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spin_unlock_irqrestore(&nc->lock, flags);
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mod_timer(&nc->monitor.timer, jiffies + HZ);
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}
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void ncsi_start_channel_monitor(struct ncsi_channel *nc)
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{
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unsigned long flags;
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spin_lock_irqsave(&nc->lock, flags);
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WARN_ON_ONCE(nc->monitor.enabled);
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nc->monitor.enabled = true;
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nc->monitor.state = NCSI_CHANNEL_MONITOR_START;
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spin_unlock_irqrestore(&nc->lock, flags);
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mod_timer(&nc->monitor.timer, jiffies + HZ);
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}
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void ncsi_stop_channel_monitor(struct ncsi_channel *nc)
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{
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unsigned long flags;
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spin_lock_irqsave(&nc->lock, flags);
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if (!nc->monitor.enabled) {
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spin_unlock_irqrestore(&nc->lock, flags);
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return;
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}
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nc->monitor.enabled = false;
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spin_unlock_irqrestore(&nc->lock, flags);
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del_timer_sync(&nc->monitor.timer);
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}
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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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{
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struct ncsi_channel *nc;
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NCSI_FOR_EACH_CHANNEL(np, nc) {
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if (nc->id == id)
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return nc;
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}
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return NULL;
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}
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struct ncsi_channel *ncsi_add_channel(struct ncsi_package *np, unsigned char id)
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{
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struct ncsi_channel *nc, *tmp;
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int index;
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unsigned long flags;
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nc = kzalloc(sizeof(*nc), GFP_ATOMIC);
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if (!nc)
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return NULL;
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nc->id = id;
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nc->package = np;
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nc->state = NCSI_CHANNEL_INACTIVE;
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nc->monitor.enabled = false;
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setup_timer(&nc->monitor.timer,
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ncsi_channel_monitor, (unsigned long)nc);
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spin_lock_init(&nc->lock);
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INIT_LIST_HEAD(&nc->link);
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for (index = 0; index < NCSI_CAP_MAX; index++)
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nc->caps[index].index = index;
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for (index = 0; index < NCSI_MODE_MAX; index++)
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nc->modes[index].index = index;
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spin_lock_irqsave(&np->lock, flags);
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tmp = ncsi_find_channel(np, id);
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if (tmp) {
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spin_unlock_irqrestore(&np->lock, flags);
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kfree(nc);
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return tmp;
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}
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list_add_tail_rcu(&nc->node, &np->channels);
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np->channel_num++;
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spin_unlock_irqrestore(&np->lock, flags);
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return nc;
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}
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static void ncsi_remove_channel(struct ncsi_channel *nc)
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{
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struct ncsi_package *np = nc->package;
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struct ncsi_channel_filter *ncf;
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unsigned long flags;
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int i;
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/* Release filters */
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spin_lock_irqsave(&nc->lock, flags);
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for (i = 0; i < NCSI_FILTER_MAX; i++) {
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ncf = nc->filters[i];
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if (!ncf)
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continue;
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nc->filters[i] = NULL;
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kfree(ncf);
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}
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nc->state = NCSI_CHANNEL_INACTIVE;
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spin_unlock_irqrestore(&nc->lock, flags);
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ncsi_stop_channel_monitor(nc);
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/* Remove and free channel */
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spin_lock_irqsave(&np->lock, flags);
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list_del_rcu(&nc->node);
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np->channel_num--;
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spin_unlock_irqrestore(&np->lock, flags);
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kfree(nc);
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}
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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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{
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struct ncsi_package *np;
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NCSI_FOR_EACH_PACKAGE(ndp, np) {
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if (np->id == id)
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return np;
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}
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return NULL;
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}
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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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{
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struct ncsi_package *np, *tmp;
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unsigned long flags;
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np = kzalloc(sizeof(*np), GFP_ATOMIC);
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if (!np)
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return NULL;
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np->id = id;
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np->ndp = ndp;
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spin_lock_init(&np->lock);
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INIT_LIST_HEAD(&np->channels);
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spin_lock_irqsave(&ndp->lock, flags);
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tmp = ncsi_find_package(ndp, id);
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if (tmp) {
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spin_unlock_irqrestore(&ndp->lock, flags);
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kfree(np);
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return tmp;
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}
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list_add_tail_rcu(&np->node, &ndp->packages);
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ndp->package_num++;
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spin_unlock_irqrestore(&ndp->lock, flags);
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return np;
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}
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void ncsi_remove_package(struct ncsi_package *np)
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{
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struct ncsi_dev_priv *ndp = np->ndp;
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struct ncsi_channel *nc, *tmp;
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unsigned long flags;
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/* Release all child channels */
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list_for_each_entry_safe(nc, tmp, &np->channels, node)
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ncsi_remove_channel(nc);
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/* Remove and free package */
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spin_lock_irqsave(&ndp->lock, flags);
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list_del_rcu(&np->node);
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ndp->package_num--;
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spin_unlock_irqrestore(&ndp->lock, flags);
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kfree(np);
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}
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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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{
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struct ncsi_package *p;
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struct ncsi_channel *c;
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p = ncsi_find_package(ndp, NCSI_PACKAGE_INDEX(id));
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c = p ? ncsi_find_channel(p, NCSI_CHANNEL_INDEX(id)) : NULL;
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if (np)
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*np = p;
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if (nc)
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*nc = c;
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}
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/* For two consecutive NCSI commands, the packet IDs shouldn't
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* be same. Otherwise, the bogus response might be replied. So
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* the available IDs are allocated in round-robin fashion.
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*/
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struct ncsi_request *ncsi_alloc_request(struct ncsi_dev_priv *ndp,
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unsigned int req_flags)
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{
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struct ncsi_request *nr = NULL;
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int i, limit = ARRAY_SIZE(ndp->requests);
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unsigned long flags;
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/* Check if there is one available request until the ceiling */
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spin_lock_irqsave(&ndp->lock, flags);
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for (i = ndp->request_id; i < limit; i++) {
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if (ndp->requests[i].used)
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continue;
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nr = &ndp->requests[i];
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nr->used = true;
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nr->flags = req_flags;
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ndp->request_id = i + 1;
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goto found;
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}
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/* Fail back to check from the starting cursor */
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for (i = NCSI_REQ_START_IDX; i < ndp->request_id; i++) {
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if (ndp->requests[i].used)
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continue;
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nr = &ndp->requests[i];
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nr->used = true;
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nr->flags = req_flags;
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ndp->request_id = i + 1;
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goto found;
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}
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found:
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spin_unlock_irqrestore(&ndp->lock, flags);
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return nr;
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}
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void ncsi_free_request(struct ncsi_request *nr)
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{
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struct ncsi_dev_priv *ndp = nr->ndp;
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struct sk_buff *cmd, *rsp;
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unsigned long flags;
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bool driven;
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if (nr->enabled) {
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nr->enabled = false;
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del_timer_sync(&nr->timer);
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}
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spin_lock_irqsave(&ndp->lock, flags);
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cmd = nr->cmd;
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rsp = nr->rsp;
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nr->cmd = NULL;
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nr->rsp = NULL;
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nr->used = false;
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driven = !!(nr->flags & NCSI_REQ_FLAG_EVENT_DRIVEN);
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spin_unlock_irqrestore(&ndp->lock, flags);
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if (driven && cmd && --ndp->pending_req_num == 0)
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schedule_work(&ndp->work);
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/* Release command and response */
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consume_skb(cmd);
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consume_skb(rsp);
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}
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struct ncsi_dev *ncsi_find_dev(struct net_device *dev)
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{
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struct ncsi_dev_priv *ndp;
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NCSI_FOR_EACH_DEV(ndp) {
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if (ndp->ndev.dev == dev)
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return &ndp->ndev;
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}
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return NULL;
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}
|
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|
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static void ncsi_request_timeout(unsigned long data)
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{
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struct ncsi_request *nr = (struct ncsi_request *)data;
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struct ncsi_dev_priv *ndp = nr->ndp;
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unsigned long flags;
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/* If the request already had associated response,
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* let the response handler to release it.
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*/
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spin_lock_irqsave(&ndp->lock, flags);
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nr->enabled = false;
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if (nr->rsp || !nr->cmd) {
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spin_unlock_irqrestore(&ndp->lock, flags);
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return;
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}
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spin_unlock_irqrestore(&ndp->lock, flags);
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|
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/* Release the request */
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ncsi_free_request(nr);
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}
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static void ncsi_suspend_channel(struct ncsi_dev_priv *ndp)
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{
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struct ncsi_dev *nd = &ndp->ndev;
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struct ncsi_package *np = ndp->active_package;
|
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struct ncsi_channel *nc = ndp->active_channel;
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struct ncsi_cmd_arg nca;
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unsigned long flags;
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int ret;
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|
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nca.ndp = ndp;
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nca.req_flags = NCSI_REQ_FLAG_EVENT_DRIVEN;
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switch (nd->state) {
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case ncsi_dev_state_suspend:
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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;
|
|
}
|
|
|
|
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)
|
|
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)
|
|
goto error;
|
|
|
|
nd->state = ncsi_dev_state_config_sma;
|
|
break;
|
|
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;
|
|
|
|
/* Use first entry in unicast filter table. Note that
|
|
* the MAC filter table starts from entry 1 instead of
|
|
* 0.
|
|
*/
|
|
if (nd->state == ncsi_dev_state_config_sma) {
|
|
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)
|
|
goto error;
|
|
break;
|
|
case ncsi_dev_state_config_done:
|
|
spin_lock_irqsave(&nc->lock, flags);
|
|
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;
|
|
}
|
|
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_warn(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;
|
|
struct ncsi_channel *nc, *found, *hot_nc;
|
|
struct ncsi_channel_mode *ncm;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ndp->lock, flags);
|
|
hot_nc = ndp->hot_channel;
|
|
spin_unlock_irqrestore(&ndp->lock, flags);
|
|
|
|
/* The search is done once an inactive channel with up
|
|
* link is found.
|
|
*/
|
|
found = NULL;
|
|
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_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) {
|
|
ncsi_report_link(ndp, true);
|
|
return -ENODEV;
|
|
}
|
|
|
|
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;
|
|
|
|
/* 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) {
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
|
|
ndp->flags |= NCSI_DEV_HWA;
|
|
return true;
|
|
}
|
|
|
|
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)) {
|
|
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:
|
|
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;
|
|
ncsi_configure_channel(ndp);
|
|
break;
|
|
case NCSI_CHANNEL_ACTIVE:
|
|
ndp->ndev.state = ncsi_dev_state_suspend;
|
|
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 */
|
|
|
|
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_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;
|
|
setup_timer(&ndp->requests[i].timer,
|
|
ncsi_request_timeout,
|
|
(unsigned long)&ndp->requests[i]);
|
|
}
|
|
|
|
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);
|
|
|
|
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)
|
|
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);
|
|
}
|
|
}
|
|
|
|
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);
|
|
|
|
kfree(ndp);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ncsi_unregister_dev);
|