399 lines
10 KiB
C
399 lines
10 KiB
C
/*
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* Copyright (c) 2004 Topspin Communications. All rights reserved.
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* Copyright (c) 2005 Intel Corporation. All rights reserved.
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* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
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* Copyright (c) 2005 Voltaire, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* $Id: cache.c 1349 2004-12-16 21:09:43Z roland $
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/sched.h> /* INIT_WORK, schedule_work(), flush_scheduled_work() */
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#include <rdma/ib_cache.h>
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#include "core_priv.h"
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struct ib_pkey_cache {
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int table_len;
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u16 table[0];
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};
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struct ib_gid_cache {
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int table_len;
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union ib_gid table[0];
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};
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struct ib_update_work {
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struct work_struct work;
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struct ib_device *device;
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u8 port_num;
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};
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static inline int start_port(struct ib_device *device)
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{
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return (device->node_type == RDMA_NODE_IB_SWITCH) ? 0 : 1;
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}
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static inline int end_port(struct ib_device *device)
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{
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return (device->node_type == RDMA_NODE_IB_SWITCH) ?
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0 : device->phys_port_cnt;
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}
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int ib_get_cached_gid(struct ib_device *device,
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u8 port_num,
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int index,
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union ib_gid *gid)
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{
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struct ib_gid_cache *cache;
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unsigned long flags;
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int ret = 0;
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if (port_num < start_port(device) || port_num > end_port(device))
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return -EINVAL;
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read_lock_irqsave(&device->cache.lock, flags);
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cache = device->cache.gid_cache[port_num - start_port(device)];
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if (index < 0 || index >= cache->table_len)
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ret = -EINVAL;
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else
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*gid = cache->table[index];
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read_unlock_irqrestore(&device->cache.lock, flags);
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return ret;
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}
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EXPORT_SYMBOL(ib_get_cached_gid);
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int ib_find_cached_gid(struct ib_device *device,
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union ib_gid *gid,
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u8 *port_num,
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u16 *index)
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{
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struct ib_gid_cache *cache;
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unsigned long flags;
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int p, i;
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int ret = -ENOENT;
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*port_num = -1;
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if (index)
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*index = -1;
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read_lock_irqsave(&device->cache.lock, flags);
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for (p = 0; p <= end_port(device) - start_port(device); ++p) {
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cache = device->cache.gid_cache[p];
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for (i = 0; i < cache->table_len; ++i) {
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if (!memcmp(gid, &cache->table[i], sizeof *gid)) {
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*port_num = p + start_port(device);
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if (index)
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*index = i;
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ret = 0;
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goto found;
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}
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}
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}
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found:
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read_unlock_irqrestore(&device->cache.lock, flags);
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return ret;
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}
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EXPORT_SYMBOL(ib_find_cached_gid);
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int ib_get_cached_pkey(struct ib_device *device,
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u8 port_num,
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int index,
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u16 *pkey)
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{
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struct ib_pkey_cache *cache;
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unsigned long flags;
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int ret = 0;
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if (port_num < start_port(device) || port_num > end_port(device))
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return -EINVAL;
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read_lock_irqsave(&device->cache.lock, flags);
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cache = device->cache.pkey_cache[port_num - start_port(device)];
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if (index < 0 || index >= cache->table_len)
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ret = -EINVAL;
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else
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*pkey = cache->table[index];
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read_unlock_irqrestore(&device->cache.lock, flags);
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return ret;
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}
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EXPORT_SYMBOL(ib_get_cached_pkey);
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int ib_find_cached_pkey(struct ib_device *device,
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u8 port_num,
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u16 pkey,
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u16 *index)
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{
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struct ib_pkey_cache *cache;
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unsigned long flags;
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int i;
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int ret = -ENOENT;
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if (port_num < start_port(device) || port_num > end_port(device))
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return -EINVAL;
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read_lock_irqsave(&device->cache.lock, flags);
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cache = device->cache.pkey_cache[port_num - start_port(device)];
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*index = -1;
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for (i = 0; i < cache->table_len; ++i)
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if ((cache->table[i] & 0x7fff) == (pkey & 0x7fff)) {
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*index = i;
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ret = 0;
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break;
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}
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read_unlock_irqrestore(&device->cache.lock, flags);
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return ret;
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}
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EXPORT_SYMBOL(ib_find_cached_pkey);
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int ib_get_cached_lmc(struct ib_device *device,
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u8 port_num,
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u8 *lmc)
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{
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unsigned long flags;
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int ret = 0;
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if (port_num < start_port(device) || port_num > end_port(device))
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return -EINVAL;
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read_lock_irqsave(&device->cache.lock, flags);
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*lmc = device->cache.lmc_cache[port_num - start_port(device)];
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read_unlock_irqrestore(&device->cache.lock, flags);
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return ret;
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}
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EXPORT_SYMBOL(ib_get_cached_lmc);
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static void ib_cache_update(struct ib_device *device,
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u8 port)
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{
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struct ib_port_attr *tprops = NULL;
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struct ib_pkey_cache *pkey_cache = NULL, *old_pkey_cache;
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struct ib_gid_cache *gid_cache = NULL, *old_gid_cache;
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int i;
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int ret;
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tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
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if (!tprops)
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return;
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ret = ib_query_port(device, port, tprops);
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if (ret) {
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printk(KERN_WARNING "ib_query_port failed (%d) for %s\n",
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ret, device->name);
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goto err;
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}
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pkey_cache = kmalloc(sizeof *pkey_cache + tprops->pkey_tbl_len *
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sizeof *pkey_cache->table, GFP_KERNEL);
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if (!pkey_cache)
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goto err;
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pkey_cache->table_len = tprops->pkey_tbl_len;
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gid_cache = kmalloc(sizeof *gid_cache + tprops->gid_tbl_len *
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sizeof *gid_cache->table, GFP_KERNEL);
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if (!gid_cache)
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goto err;
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gid_cache->table_len = tprops->gid_tbl_len;
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for (i = 0; i < pkey_cache->table_len; ++i) {
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ret = ib_query_pkey(device, port, i, pkey_cache->table + i);
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if (ret) {
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printk(KERN_WARNING "ib_query_pkey failed (%d) for %s (index %d)\n",
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ret, device->name, i);
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goto err;
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}
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}
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for (i = 0; i < gid_cache->table_len; ++i) {
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ret = ib_query_gid(device, port, i, gid_cache->table + i);
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if (ret) {
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printk(KERN_WARNING "ib_query_gid failed (%d) for %s (index %d)\n",
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ret, device->name, i);
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goto err;
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}
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}
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write_lock_irq(&device->cache.lock);
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old_pkey_cache = device->cache.pkey_cache[port - start_port(device)];
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old_gid_cache = device->cache.gid_cache [port - start_port(device)];
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device->cache.pkey_cache[port - start_port(device)] = pkey_cache;
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device->cache.gid_cache [port - start_port(device)] = gid_cache;
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device->cache.lmc_cache[port - start_port(device)] = tprops->lmc;
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write_unlock_irq(&device->cache.lock);
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kfree(old_pkey_cache);
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kfree(old_gid_cache);
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kfree(tprops);
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return;
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err:
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kfree(pkey_cache);
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kfree(gid_cache);
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kfree(tprops);
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}
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static void ib_cache_task(void *work_ptr)
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{
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struct ib_update_work *work = work_ptr;
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ib_cache_update(work->device, work->port_num);
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kfree(work);
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}
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static void ib_cache_event(struct ib_event_handler *handler,
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struct ib_event *event)
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{
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struct ib_update_work *work;
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if (event->event == IB_EVENT_PORT_ERR ||
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event->event == IB_EVENT_PORT_ACTIVE ||
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event->event == IB_EVENT_LID_CHANGE ||
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event->event == IB_EVENT_PKEY_CHANGE ||
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event->event == IB_EVENT_SM_CHANGE ||
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event->event == IB_EVENT_CLIENT_REREGISTER) {
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work = kmalloc(sizeof *work, GFP_ATOMIC);
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if (work) {
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INIT_WORK(&work->work, ib_cache_task, work);
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work->device = event->device;
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work->port_num = event->element.port_num;
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schedule_work(&work->work);
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}
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}
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}
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static void ib_cache_setup_one(struct ib_device *device)
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{
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int p;
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rwlock_init(&device->cache.lock);
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device->cache.pkey_cache =
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kmalloc(sizeof *device->cache.pkey_cache *
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(end_port(device) - start_port(device) + 1), GFP_KERNEL);
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device->cache.gid_cache =
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kmalloc(sizeof *device->cache.gid_cache *
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(end_port(device) - start_port(device) + 1), GFP_KERNEL);
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device->cache.lmc_cache = kmalloc(sizeof *device->cache.lmc_cache *
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(end_port(device) -
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start_port(device) + 1),
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GFP_KERNEL);
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if (!device->cache.pkey_cache || !device->cache.gid_cache ||
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!device->cache.lmc_cache) {
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printk(KERN_WARNING "Couldn't allocate cache "
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"for %s\n", device->name);
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goto err;
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}
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for (p = 0; p <= end_port(device) - start_port(device); ++p) {
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device->cache.pkey_cache[p] = NULL;
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device->cache.gid_cache [p] = NULL;
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ib_cache_update(device, p + start_port(device));
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}
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INIT_IB_EVENT_HANDLER(&device->cache.event_handler,
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device, ib_cache_event);
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if (ib_register_event_handler(&device->cache.event_handler))
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goto err_cache;
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return;
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err_cache:
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for (p = 0; p <= end_port(device) - start_port(device); ++p) {
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kfree(device->cache.pkey_cache[p]);
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kfree(device->cache.gid_cache[p]);
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}
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err:
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kfree(device->cache.pkey_cache);
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kfree(device->cache.gid_cache);
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kfree(device->cache.lmc_cache);
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}
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static void ib_cache_cleanup_one(struct ib_device *device)
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{
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int p;
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ib_unregister_event_handler(&device->cache.event_handler);
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flush_scheduled_work();
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for (p = 0; p <= end_port(device) - start_port(device); ++p) {
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kfree(device->cache.pkey_cache[p]);
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kfree(device->cache.gid_cache[p]);
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}
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kfree(device->cache.pkey_cache);
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kfree(device->cache.gid_cache);
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kfree(device->cache.lmc_cache);
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}
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static struct ib_client cache_client = {
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.name = "cache",
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.add = ib_cache_setup_one,
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.remove = ib_cache_cleanup_one
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};
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int __init ib_cache_setup(void)
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{
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return ib_register_client(&cache_client);
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}
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void __exit ib_cache_cleanup(void)
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{
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ib_unregister_client(&cache_client);
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}
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