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2d283bdd07
NCSI spec (DSP0222) defines several objects: package, channel, mode, filter, version and statistics etc. This introduces the data structs to represent those objects and implement functions to manage them. Also, this introduces CONFIG_NET_NCSI for the newly implemented NCSI stack. * The user (e.g. netdev driver) dereference NCSI device by "struct ncsi_dev", which is embedded to "struct ncsi_dev_priv". The later one is used by NCSI stack internally. * Every NCSI device can have multiple packages simultaneously, up to 8 packages. It's represented by "struct ncsi_package" and identified by 3-bits ID. * Every NCSI package can have multiple channels, up to 32. It's represented by "struct ncsi_channel" and identified by 5-bits ID. * Every NCSI channel has version, statistics, various modes and filters. They are represented by "struct ncsi_channel_version", "struct ncsi_channel_stats", "struct ncsi_channel_mode" and "struct ncsi_channel_filter" separately. * Apart from AEN (Asynchronous Event Notification), the NCSI stack works in terms of command and response. This introduces "struct ncsi_req" to represent a complete NCSI transaction made of NCSI request and response. link: https://www.dmtf.org/sites/default/files/standards/documents/DSP0222_1.1.0.pdf Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com> Acked-by: Joel Stanley <joel@jms.id.au> Signed-off-by: David S. Miller <davem@davemloft.net>
436 lines
9.4 KiB
C
436 lines
9.4 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 "internal.h"
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LIST_HEAD(ncsi_dev_list);
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DEFINE_SPINLOCK(ncsi_dev_lock);
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static inline int ncsi_filter_size(int table)
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{
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int sizes[] = { 2, 6, 6, 6 };
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BUILD_BUG_ON(ARRAY_SIZE(sizes) != NCSI_FILTER_MAX);
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if (table < NCSI_FILTER_BASE || table >= NCSI_FILTER_MAX)
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return -EINVAL;
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return sizes[table];
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}
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int ncsi_find_filter(struct ncsi_channel *nc, int table, void *data)
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{
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struct ncsi_channel_filter *ncf;
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void *bitmap;
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int index, size;
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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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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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spin_lock_init(&nc->lock);
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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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/* 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, bool driven)
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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; !nr && 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->driven = driven;
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if (++ndp->request_id >= limit)
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ndp->request_id = 0;
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}
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/* Fail back to check from the starting cursor */
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for (i = 0; !nr && 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->driven = driven;
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if (++ndp->request_id >= limit)
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ndp->request_id = 0;
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}
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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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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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spin_unlock_irqrestore(&ndp->lock, flags);
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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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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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/* Release the request */
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ncsi_free_request(nr);
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}
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struct ncsi_dev *ncsi_register_dev(struct net_device *dev,
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void (*handler)(struct ncsi_dev *ndev))
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{
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struct ncsi_dev_priv *ndp;
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struct ncsi_dev *nd;
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unsigned long flags;
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int i;
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/* Check if the device has been registered or not */
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nd = ncsi_find_dev(dev);
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if (nd)
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return nd;
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/* Create NCSI device */
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ndp = kzalloc(sizeof(*ndp), GFP_ATOMIC);
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if (!ndp)
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return NULL;
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nd = &ndp->ndev;
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nd->state = ncsi_dev_state_registered;
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nd->dev = dev;
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nd->handler = handler;
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/* Initialize private NCSI device */
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spin_lock_init(&ndp->lock);
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INIT_LIST_HEAD(&ndp->packages);
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ndp->request_id = 0;
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for (i = 0; i < ARRAY_SIZE(ndp->requests); i++) {
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ndp->requests[i].id = i;
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ndp->requests[i].ndp = ndp;
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setup_timer(&ndp->requests[i].timer,
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ncsi_request_timeout,
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(unsigned long)&ndp->requests[i]);
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}
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spin_lock_irqsave(&ncsi_dev_lock, flags);
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list_add_tail_rcu(&ndp->node, &ncsi_dev_list);
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spin_unlock_irqrestore(&ncsi_dev_lock, flags);
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return nd;
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}
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EXPORT_SYMBOL_GPL(ncsi_register_dev);
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void ncsi_unregister_dev(struct ncsi_dev *nd)
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{
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struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
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struct ncsi_package *np, *tmp;
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unsigned long flags;
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list_for_each_entry_safe(np, tmp, &ndp->packages, node)
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ncsi_remove_package(np);
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spin_lock_irqsave(&ncsi_dev_lock, flags);
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list_del_rcu(&ndp->node);
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spin_unlock_irqrestore(&ncsi_dev_lock, flags);
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kfree(ndp);
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}
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EXPORT_SYMBOL_GPL(ncsi_unregister_dev);
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