mr.c 28.4 KB
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/*
 * Copyright (c) 2013, Mellanox Technologies inc.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */


#include <linux/kref.h>
#include <linux/random.h>
#include <linux/debugfs.h>
#include <linux/export.h>
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#include <linux/delay.h>
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#include <rdma/ib_umem.h>
#include "mlx5_ib.h"

enum {
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	MAX_PENDING_REG_MR = 8,
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};

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enum {
	MLX5_UMR_ALIGN	= 2048
};

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static __be64 *mr_align(__be64 *ptr, int align)
{
	unsigned long mask = align - 1;

	return (__be64 *)(((unsigned long)ptr + mask) & ~mask);
}

static int order2idx(struct mlx5_ib_dev *dev, int order)
{
	struct mlx5_mr_cache *cache = &dev->cache;

	if (order < cache->ent[0].order)
		return 0;
	else
		return order - cache->ent[0].order;
}

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static void reg_mr_callback(int status, void *context)
{
	struct mlx5_ib_mr *mr = context;
	struct mlx5_ib_dev *dev = mr->dev;
	struct mlx5_mr_cache *cache = &dev->cache;
	int c = order2idx(dev, mr->order);
	struct mlx5_cache_ent *ent = &cache->ent[c];
	u8 key;
	unsigned long flags;
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	struct mlx5_mr_table *table = &dev->mdev.priv.mr_table;
	int err;
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	spin_lock_irqsave(&ent->lock, flags);
	ent->pending--;
	spin_unlock_irqrestore(&ent->lock, flags);
	if (status) {
		mlx5_ib_warn(dev, "async reg mr failed. status %d\n", status);
		kfree(mr);
		dev->fill_delay = 1;
		mod_timer(&dev->delay_timer, jiffies + HZ);
		return;
	}

	if (mr->out.hdr.status) {
		mlx5_ib_warn(dev, "failed - status %d, syndorme 0x%x\n",
			     mr->out.hdr.status,
			     be32_to_cpu(mr->out.hdr.syndrome));
		kfree(mr);
		dev->fill_delay = 1;
		mod_timer(&dev->delay_timer, jiffies + HZ);
		return;
	}

	spin_lock_irqsave(&dev->mdev.priv.mkey_lock, flags);
	key = dev->mdev.priv.mkey_key++;
	spin_unlock_irqrestore(&dev->mdev.priv.mkey_lock, flags);
	mr->mmr.key = mlx5_idx_to_mkey(be32_to_cpu(mr->out.mkey) & 0xffffff) | key;

	cache->last_add = jiffies;

	spin_lock_irqsave(&ent->lock, flags);
	list_add_tail(&mr->list, &ent->head);
	ent->cur++;
	ent->size++;
	spin_unlock_irqrestore(&ent->lock, flags);
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	write_lock_irqsave(&table->lock, flags);
	err = radix_tree_insert(&table->tree, mlx5_base_mkey(mr->mmr.key),
				&mr->mmr);
	if (err)
		pr_err("Error inserting to mr tree. 0x%x\n", -err);
	write_unlock_irqrestore(&table->lock, flags);
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}

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static int add_keys(struct mlx5_ib_dev *dev, int c, int num)
{
	struct mlx5_mr_cache *cache = &dev->cache;
	struct mlx5_cache_ent *ent = &cache->ent[c];
	struct mlx5_create_mkey_mbox_in *in;
	struct mlx5_ib_mr *mr;
	int npages = 1 << ent->order;
	int err = 0;
	int i;

	in = kzalloc(sizeof(*in), GFP_KERNEL);
	if (!in)
		return -ENOMEM;

	for (i = 0; i < num; i++) {
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		if (ent->pending >= MAX_PENDING_REG_MR) {
			err = -EAGAIN;
			break;
		}

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		mr = kzalloc(sizeof(*mr), GFP_KERNEL);
		if (!mr) {
			err = -ENOMEM;
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			break;
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		}
		mr->order = ent->order;
		mr->umred = 1;
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		mr->dev = dev;
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		in->seg.status = 1 << 6;
		in->seg.xlt_oct_size = cpu_to_be32((npages + 1) / 2);
		in->seg.qpn_mkey7_0 = cpu_to_be32(0xffffff << 8);
		in->seg.flags = MLX5_ACCESS_MODE_MTT | MLX5_PERM_UMR_EN;
		in->seg.log2_page_size = 12;

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		spin_lock_irq(&ent->lock);
		ent->pending++;
		spin_unlock_irq(&ent->lock);
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		err = mlx5_core_create_mkey(&dev->mdev, &mr->mmr, in,
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					    sizeof(*in), reg_mr_callback,
					    mr, &mr->out);
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		if (err) {
			mlx5_ib_warn(dev, "create mkey failed %d\n", err);
			kfree(mr);
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			break;
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		}
	}

	kfree(in);
	return err;
}

static void remove_keys(struct mlx5_ib_dev *dev, int c, int num)
{
	struct mlx5_mr_cache *cache = &dev->cache;
	struct mlx5_cache_ent *ent = &cache->ent[c];
	struct mlx5_ib_mr *mr;
	int err;
	int i;

	for (i = 0; i < num; i++) {
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		spin_lock_irq(&ent->lock);
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		if (list_empty(&ent->head)) {
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			spin_unlock_irq(&ent->lock);
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			return;
		}
		mr = list_first_entry(&ent->head, struct mlx5_ib_mr, list);
		list_del(&mr->list);
		ent->cur--;
		ent->size--;
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		spin_unlock_irq(&ent->lock);
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		err = mlx5_core_destroy_mkey(&dev->mdev, &mr->mmr);
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		if (err)
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			mlx5_ib_warn(dev, "failed destroy mkey\n");
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		else
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			kfree(mr);
	}
}

static ssize_t size_write(struct file *filp, const char __user *buf,
			  size_t count, loff_t *pos)
{
	struct mlx5_cache_ent *ent = filp->private_data;
	struct mlx5_ib_dev *dev = ent->dev;
	char lbuf[20];
	u32 var;
	int err;
	int c;

	if (copy_from_user(lbuf, buf, sizeof(lbuf)))
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		return -EFAULT;
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	c = order2idx(dev, ent->order);
	lbuf[sizeof(lbuf) - 1] = 0;

	if (sscanf(lbuf, "%u", &var) != 1)
		return -EINVAL;

	if (var < ent->limit)
		return -EINVAL;

	if (var > ent->size) {
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		do {
			err = add_keys(dev, c, var - ent->size);
			if (err && err != -EAGAIN)
				return err;

			usleep_range(3000, 5000);
		} while (err);
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	} else if (var < ent->size) {
		remove_keys(dev, c, ent->size - var);
	}

	return count;
}

static ssize_t size_read(struct file *filp, char __user *buf, size_t count,
			 loff_t *pos)
{
	struct mlx5_cache_ent *ent = filp->private_data;
	char lbuf[20];
	int err;

	if (*pos)
		return 0;

	err = snprintf(lbuf, sizeof(lbuf), "%d\n", ent->size);
	if (err < 0)
		return err;

	if (copy_to_user(buf, lbuf, err))
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		return -EFAULT;
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	*pos += err;

	return err;
}

static const struct file_operations size_fops = {
	.owner	= THIS_MODULE,
	.open	= simple_open,
	.write	= size_write,
	.read	= size_read,
};

static ssize_t limit_write(struct file *filp, const char __user *buf,
			   size_t count, loff_t *pos)
{
	struct mlx5_cache_ent *ent = filp->private_data;
	struct mlx5_ib_dev *dev = ent->dev;
	char lbuf[20];
	u32 var;
	int err;
	int c;

	if (copy_from_user(lbuf, buf, sizeof(lbuf)))
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		return -EFAULT;
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	c = order2idx(dev, ent->order);
	lbuf[sizeof(lbuf) - 1] = 0;

	if (sscanf(lbuf, "%u", &var) != 1)
		return -EINVAL;

	if (var > ent->size)
		return -EINVAL;

	ent->limit = var;

	if (ent->cur < ent->limit) {
		err = add_keys(dev, c, 2 * ent->limit - ent->cur);
		if (err)
			return err;
	}

	return count;
}

static ssize_t limit_read(struct file *filp, char __user *buf, size_t count,
			  loff_t *pos)
{
	struct mlx5_cache_ent *ent = filp->private_data;
	char lbuf[20];
	int err;

	if (*pos)
		return 0;

	err = snprintf(lbuf, sizeof(lbuf), "%d\n", ent->limit);
	if (err < 0)
		return err;

	if (copy_to_user(buf, lbuf, err))
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		return -EFAULT;
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	*pos += err;

	return err;
}

static const struct file_operations limit_fops = {
	.owner	= THIS_MODULE,
	.open	= simple_open,
	.write	= limit_write,
	.read	= limit_read,
};

static int someone_adding(struct mlx5_mr_cache *cache)
{
	int i;

	for (i = 0; i < MAX_MR_CACHE_ENTRIES; i++) {
		if (cache->ent[i].cur < cache->ent[i].limit)
			return 1;
	}

	return 0;
}

static void __cache_work_func(struct mlx5_cache_ent *ent)
{
	struct mlx5_ib_dev *dev = ent->dev;
	struct mlx5_mr_cache *cache = &dev->cache;
	int i = order2idx(dev, ent->order);
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	int err;
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	if (cache->stopped)
		return;

	ent = &dev->cache.ent[i];
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	if (ent->cur < 2 * ent->limit && !dev->fill_delay) {
		err = add_keys(dev, i, 1);
		if (ent->cur < 2 * ent->limit) {
			if (err == -EAGAIN) {
				mlx5_ib_dbg(dev, "returned eagain, order %d\n",
					    i + 2);
				queue_delayed_work(cache->wq, &ent->dwork,
						   msecs_to_jiffies(3));
			} else if (err) {
				mlx5_ib_warn(dev, "command failed order %d, err %d\n",
					     i + 2, err);
				queue_delayed_work(cache->wq, &ent->dwork,
						   msecs_to_jiffies(1000));
			} else {
				queue_work(cache->wq, &ent->work);
			}
		}
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	} else if (ent->cur > 2 * ent->limit) {
		if (!someone_adding(cache) &&
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		    time_after(jiffies, cache->last_add + 300 * HZ)) {
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			remove_keys(dev, i, 1);
			if (ent->cur > ent->limit)
				queue_work(cache->wq, &ent->work);
		} else {
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			queue_delayed_work(cache->wq, &ent->dwork, 300 * HZ);
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		}
	}
}

static void delayed_cache_work_func(struct work_struct *work)
{
	struct mlx5_cache_ent *ent;

	ent = container_of(work, struct mlx5_cache_ent, dwork.work);
	__cache_work_func(ent);
}

static void cache_work_func(struct work_struct *work)
{
	struct mlx5_cache_ent *ent;

	ent = container_of(work, struct mlx5_cache_ent, work);
	__cache_work_func(ent);
}

static struct mlx5_ib_mr *alloc_cached_mr(struct mlx5_ib_dev *dev, int order)
{
	struct mlx5_mr_cache *cache = &dev->cache;
	struct mlx5_ib_mr *mr = NULL;
	struct mlx5_cache_ent *ent;
	int c;
	int i;

	c = order2idx(dev, order);
	if (c < 0 || c >= MAX_MR_CACHE_ENTRIES) {
		mlx5_ib_warn(dev, "order %d, cache index %d\n", order, c);
		return NULL;
	}

	for (i = c; i < MAX_MR_CACHE_ENTRIES; i++) {
		ent = &cache->ent[i];

		mlx5_ib_dbg(dev, "order %d, cache index %d\n", ent->order, i);

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		spin_lock_irq(&ent->lock);
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		if (!list_empty(&ent->head)) {
			mr = list_first_entry(&ent->head, struct mlx5_ib_mr,
					      list);
			list_del(&mr->list);
			ent->cur--;
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			spin_unlock_irq(&ent->lock);
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			if (ent->cur < ent->limit)
				queue_work(cache->wq, &ent->work);
			break;
		}
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		spin_unlock_irq(&ent->lock);
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		queue_work(cache->wq, &ent->work);

		if (mr)
			break;
	}

	if (!mr)
		cache->ent[c].miss++;

	return mr;
}

static void free_cached_mr(struct mlx5_ib_dev *dev, struct mlx5_ib_mr *mr)
{
	struct mlx5_mr_cache *cache = &dev->cache;
	struct mlx5_cache_ent *ent;
	int shrink = 0;
	int c;

	c = order2idx(dev, mr->order);
	if (c < 0 || c >= MAX_MR_CACHE_ENTRIES) {
		mlx5_ib_warn(dev, "order %d, cache index %d\n", mr->order, c);
		return;
	}
	ent = &cache->ent[c];
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	spin_lock_irq(&ent->lock);
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	list_add_tail(&mr->list, &ent->head);
	ent->cur++;
	if (ent->cur > 2 * ent->limit)
		shrink = 1;
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	spin_unlock_irq(&ent->lock);
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	if (shrink)
		queue_work(cache->wq, &ent->work);
}

static void clean_keys(struct mlx5_ib_dev *dev, int c)
{
	struct mlx5_mr_cache *cache = &dev->cache;
	struct mlx5_cache_ent *ent = &cache->ent[c];
	struct mlx5_ib_mr *mr;
	int err;

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	cancel_delayed_work(&ent->dwork);
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	while (1) {
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		spin_lock_irq(&ent->lock);
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		if (list_empty(&ent->head)) {
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			spin_unlock_irq(&ent->lock);
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			return;
		}
		mr = list_first_entry(&ent->head, struct mlx5_ib_mr, list);
		list_del(&mr->list);
		ent->cur--;
		ent->size--;
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		spin_unlock_irq(&ent->lock);
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		err = mlx5_core_destroy_mkey(&dev->mdev, &mr->mmr);
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		if (err)
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			mlx5_ib_warn(dev, "failed destroy mkey\n");
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		else
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			kfree(mr);
	}
}

static int mlx5_mr_cache_debugfs_init(struct mlx5_ib_dev *dev)
{
	struct mlx5_mr_cache *cache = &dev->cache;
	struct mlx5_cache_ent *ent;
	int i;

	if (!mlx5_debugfs_root)
		return 0;

	cache->root = debugfs_create_dir("mr_cache", dev->mdev.priv.dbg_root);
	if (!cache->root)
		return -ENOMEM;

	for (i = 0; i < MAX_MR_CACHE_ENTRIES; i++) {
		ent = &cache->ent[i];
		sprintf(ent->name, "%d", ent->order);
		ent->dir = debugfs_create_dir(ent->name,  cache->root);
		if (!ent->dir)
			return -ENOMEM;

		ent->fsize = debugfs_create_file("size", 0600, ent->dir, ent,
						 &size_fops);
		if (!ent->fsize)
			return -ENOMEM;

		ent->flimit = debugfs_create_file("limit", 0600, ent->dir, ent,
						  &limit_fops);
		if (!ent->flimit)
			return -ENOMEM;

		ent->fcur = debugfs_create_u32("cur", 0400, ent->dir,
					       &ent->cur);
		if (!ent->fcur)
			return -ENOMEM;

		ent->fmiss = debugfs_create_u32("miss", 0600, ent->dir,
						&ent->miss);
		if (!ent->fmiss)
			return -ENOMEM;
	}

	return 0;
}

static void mlx5_mr_cache_debugfs_cleanup(struct mlx5_ib_dev *dev)
{
	if (!mlx5_debugfs_root)
		return;

	debugfs_remove_recursive(dev->cache.root);
}

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static void delay_time_func(unsigned long ctx)
{
	struct mlx5_ib_dev *dev = (struct mlx5_ib_dev *)ctx;

	dev->fill_delay = 0;
}

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int mlx5_mr_cache_init(struct mlx5_ib_dev *dev)
{
	struct mlx5_mr_cache *cache = &dev->cache;
	struct mlx5_cache_ent *ent;
	int limit;
	int err;
	int i;

	cache->wq = create_singlethread_workqueue("mkey_cache");
	if (!cache->wq) {
		mlx5_ib_warn(dev, "failed to create work queue\n");
		return -ENOMEM;
	}

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	setup_timer(&dev->delay_timer, delay_time_func, (unsigned long)dev);
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	for (i = 0; i < MAX_MR_CACHE_ENTRIES; i++) {
		INIT_LIST_HEAD(&cache->ent[i].head);
		spin_lock_init(&cache->ent[i].lock);

		ent = &cache->ent[i];
		INIT_LIST_HEAD(&ent->head);
		spin_lock_init(&ent->lock);
		ent->order = i + 2;
		ent->dev = dev;

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		if (dev->mdev.profile->mask & MLX5_PROF_MASK_MR_CACHE)
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			limit = dev->mdev.profile->mr_cache[i].limit;
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		else
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			limit = 0;
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		INIT_WORK(&ent->work, cache_work_func);
		INIT_DELAYED_WORK(&ent->dwork, delayed_cache_work_func);
		ent->limit = limit;
		queue_work(cache->wq, &ent->work);
	}

	err = mlx5_mr_cache_debugfs_init(dev);
	if (err)
		mlx5_ib_warn(dev, "cache debugfs failure\n");

	return 0;
}

int mlx5_mr_cache_cleanup(struct mlx5_ib_dev *dev)
{
	int i;

	dev->cache.stopped = 1;
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	flush_workqueue(dev->cache.wq);
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	mlx5_mr_cache_debugfs_cleanup(dev);

	for (i = 0; i < MAX_MR_CACHE_ENTRIES; i++)
		clean_keys(dev, i);

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	destroy_workqueue(dev->cache.wq);
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	del_timer_sync(&dev->delay_timer);
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	return 0;
}

struct ib_mr *mlx5_ib_get_dma_mr(struct ib_pd *pd, int acc)
{
	struct mlx5_ib_dev *dev = to_mdev(pd->device);
	struct mlx5_core_dev *mdev = &dev->mdev;
	struct mlx5_create_mkey_mbox_in *in;
	struct mlx5_mkey_seg *seg;
	struct mlx5_ib_mr *mr;
	int err;

	mr = kzalloc(sizeof(*mr), GFP_KERNEL);
	if (!mr)
		return ERR_PTR(-ENOMEM);

	in = kzalloc(sizeof(*in), GFP_KERNEL);
	if (!in) {
		err = -ENOMEM;
		goto err_free;
	}

	seg = &in->seg;
	seg->flags = convert_access(acc) | MLX5_ACCESS_MODE_PA;
	seg->flags_pd = cpu_to_be32(to_mpd(pd)->pdn | MLX5_MKEY_LEN64);
	seg->qpn_mkey7_0 = cpu_to_be32(0xffffff << 8);
	seg->start_addr = 0;

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	err = mlx5_core_create_mkey(mdev, &mr->mmr, in, sizeof(*in), NULL, NULL,
				    NULL);
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	if (err)
		goto err_in;

	kfree(in);
	mr->ibmr.lkey = mr->mmr.key;
	mr->ibmr.rkey = mr->mmr.key;
	mr->umem = NULL;

	return &mr->ibmr;

err_in:
	kfree(in);

err_free:
	kfree(mr);

	return ERR_PTR(err);
}

static int get_octo_len(u64 addr, u64 len, int page_size)
{
	u64 offset;
	int npages;

	offset = addr & (page_size - 1);
	npages = ALIGN(len + offset, page_size) >> ilog2(page_size);
	return (npages + 1) / 2;
}

static int use_umr(int order)
{
	return order <= 17;
}

static void prep_umr_reg_wqe(struct ib_pd *pd, struct ib_send_wr *wr,
			     struct ib_sge *sg, u64 dma, int n, u32 key,
			     int page_shift, u64 virt_addr, u64 len,
			     int access_flags)
{
	struct mlx5_ib_dev *dev = to_mdev(pd->device);
	struct ib_mr *mr = dev->umrc.mr;

	sg->addr = dma;
	sg->length = ALIGN(sizeof(u64) * n, 64);
	sg->lkey = mr->lkey;

	wr->next = NULL;
	wr->send_flags = 0;
	wr->sg_list = sg;
	if (n)
		wr->num_sge = 1;
	else
		wr->num_sge = 0;

	wr->opcode = MLX5_IB_WR_UMR;
	wr->wr.fast_reg.page_list_len = n;
	wr->wr.fast_reg.page_shift = page_shift;
	wr->wr.fast_reg.rkey = key;
	wr->wr.fast_reg.iova_start = virt_addr;
	wr->wr.fast_reg.length = len;
	wr->wr.fast_reg.access_flags = access_flags;
	wr->wr.fast_reg.page_list = (struct ib_fast_reg_page_list *)pd;
}

static void prep_umr_unreg_wqe(struct mlx5_ib_dev *dev,
			       struct ib_send_wr *wr, u32 key)
{
	wr->send_flags = MLX5_IB_SEND_UMR_UNREG;
	wr->opcode = MLX5_IB_WR_UMR;
	wr->wr.fast_reg.rkey = key;
}

void mlx5_umr_cq_handler(struct ib_cq *cq, void *cq_context)
{
711
	struct mlx5_ib_umr_context *context;
712 713 714 715 716 717 718 719 720 721 722 723
	struct ib_wc wc;
	int err;

	while (1) {
		err = ib_poll_cq(cq, 1, &wc);
		if (err < 0) {
			pr_warn("poll cq error %d\n", err);
			return;
		}
		if (err == 0)
			break;

724 725 726
		context = (struct mlx5_ib_umr_context *)wc.wr_id;
		context->status = wc.status;
		complete(&context->done);
727 728 729 730 731 732 733 734 735
	}
	ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
}

static struct mlx5_ib_mr *reg_umr(struct ib_pd *pd, struct ib_umem *umem,
				  u64 virt_addr, u64 len, int npages,
				  int page_shift, int order, int access_flags)
{
	struct mlx5_ib_dev *dev = to_mdev(pd->device);
736
	struct device *ddev = dev->ib_dev.dma_device;
737
	struct umr_common *umrc = &dev->umrc;
738
	struct mlx5_ib_umr_context umr_context;
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	struct ib_send_wr wr, *bad;
	struct mlx5_ib_mr *mr;
	struct ib_sge sg;
742
	int size = sizeof(u64) * npages;
743
	int err = 0;
744 745
	int i;

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	for (i = 0; i < 1; i++) {
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		mr = alloc_cached_mr(dev, order);
		if (mr)
			break;

		err = add_keys(dev, order2idx(dev, order), 1);
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		if (err && err != -EAGAIN) {
			mlx5_ib_warn(dev, "add_keys failed, err %d\n", err);
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			break;
		}
	}

	if (!mr)
		return ERR_PTR(-EAGAIN);

761
	mr->pas = kmalloc(size + MLX5_UMR_ALIGN - 1, GFP_KERNEL);
762 763
	if (!mr->pas) {
		err = -ENOMEM;
764
		goto free_mr;
765
	}
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	mlx5_ib_populate_pas(dev, umem, page_shift,
			     mr_align(mr->pas, MLX5_UMR_ALIGN), 1);

770
	mr->dma = dma_map_single(ddev, mr_align(mr->pas, MLX5_UMR_ALIGN), size,
771 772 773
				 DMA_TO_DEVICE);
	if (dma_mapping_error(ddev, mr->dma)) {
		err = -ENOMEM;
774
		goto free_pas;
775 776
	}

777
	memset(&wr, 0, sizeof(wr));
778
	wr.wr_id = (u64)(unsigned long)&umr_context;
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	prep_umr_reg_wqe(pd, &wr, &sg, mr->dma, npages, mr->mmr.key, page_shift, virt_addr, len, access_flags);

781
	mlx5_ib_init_umr_context(&umr_context);
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	down(&umrc->sem);
	err = ib_post_send(umrc->qp, &wr, &bad);
	if (err) {
		mlx5_ib_warn(dev, "post send failed, err %d\n", err);
786
		goto unmap_dma;
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	} else {
		wait_for_completion(&umr_context.done);
		if (umr_context.status != IB_WC_SUCCESS) {
			mlx5_ib_warn(dev, "reg umr failed\n");
			err = -EFAULT;
		}
793
	}
794

795 796 797 798
	mr->mmr.iova = virt_addr;
	mr->mmr.size = len;
	mr->mmr.pd = to_mpd(pd)->pdn;

799 800
unmap_dma:
	up(&umrc->sem);
801
	dma_unmap_single(ddev, mr->dma, size, DMA_TO_DEVICE);
802 803

free_pas:
804 805
	kfree(mr->pas);

806 807 808 809
free_mr:
	if (err) {
		free_cached_mr(dev, mr);
		return ERR_PTR(err);
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	}

	return mr;
}

static struct mlx5_ib_mr *reg_create(struct ib_pd *pd, u64 virt_addr,
				     u64 length, struct ib_umem *umem,
				     int npages, int page_shift,
				     int access_flags)
{
	struct mlx5_ib_dev *dev = to_mdev(pd->device);
	struct mlx5_create_mkey_mbox_in *in;
	struct mlx5_ib_mr *mr;
	int inlen;
	int err;

	mr = kzalloc(sizeof(*mr), GFP_KERNEL);
	if (!mr)
		return ERR_PTR(-ENOMEM);

	inlen = sizeof(*in) + sizeof(*in->pas) * ((npages + 1) / 2) * 2;
	in = mlx5_vzalloc(inlen);
	if (!in) {
		err = -ENOMEM;
		goto err_1;
	}
	mlx5_ib_populate_pas(dev, umem, page_shift, in->pas, 0);

	in->seg.flags = convert_access(access_flags) |
		MLX5_ACCESS_MODE_MTT;
	in->seg.flags_pd = cpu_to_be32(to_mpd(pd)->pdn);
	in->seg.start_addr = cpu_to_be64(virt_addr);
	in->seg.len = cpu_to_be64(length);
	in->seg.bsfs_octo_size = 0;
	in->seg.xlt_oct_size = cpu_to_be32(get_octo_len(virt_addr, length, 1 << page_shift));
	in->seg.log2_page_size = page_shift;
	in->seg.qpn_mkey7_0 = cpu_to_be32(0xffffff << 8);
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	in->xlat_oct_act_size = cpu_to_be32(get_octo_len(virt_addr, length,
							 1 << page_shift));
	err = mlx5_core_create_mkey(&dev->mdev, &mr->mmr, in, inlen, NULL,
				    NULL, NULL);
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	if (err) {
		mlx5_ib_warn(dev, "create mkey failed\n");
		goto err_2;
	}
	mr->umem = umem;
	mlx5_vfree(in);

	mlx5_ib_dbg(dev, "mkey = 0x%x\n", mr->mmr.key);

	return mr;

err_2:
	mlx5_vfree(in);

err_1:
	kfree(mr);

	return ERR_PTR(err);
}

struct ib_mr *mlx5_ib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
				  u64 virt_addr, int access_flags,
				  struct ib_udata *udata)
{
	struct mlx5_ib_dev *dev = to_mdev(pd->device);
	struct mlx5_ib_mr *mr = NULL;
	struct ib_umem *umem;
	int page_shift;
	int npages;
	int ncont;
	int order;
	int err;

	mlx5_ib_dbg(dev, "start 0x%llx, virt_addr 0x%llx, length 0x%llx\n",
		    start, virt_addr, length);
	umem = ib_umem_get(pd->uobject->context, start, length, access_flags,
			   0);
	if (IS_ERR(umem)) {
		mlx5_ib_dbg(dev, "umem get failed\n");
		return (void *)umem;
	}

	mlx5_ib_cont_pages(umem, start, &npages, &page_shift, &ncont, &order);
	if (!npages) {
		mlx5_ib_warn(dev, "avoid zero region\n");
		err = -EINVAL;
		goto error;
	}

	mlx5_ib_dbg(dev, "npages %d, ncont %d, order %d, page_shift %d\n",
		    npages, ncont, order, page_shift);

	if (use_umr(order)) {
		mr = reg_umr(pd, umem, virt_addr, length, ncont, page_shift,
			     order, access_flags);
		if (PTR_ERR(mr) == -EAGAIN) {
			mlx5_ib_dbg(dev, "cache empty for order %d", order);
			mr = NULL;
		}
	}

	if (!mr)
		mr = reg_create(pd, virt_addr, length, umem, ncont, page_shift,
				access_flags);

	if (IS_ERR(mr)) {
		err = PTR_ERR(mr);
		goto error;
	}

	mlx5_ib_dbg(dev, "mkey 0x%x\n", mr->mmr.key);

	mr->umem = umem;
	mr->npages = npages;
	spin_lock(&dev->mr_lock);
	dev->mdev.priv.reg_pages += npages;
	spin_unlock(&dev->mr_lock);
	mr->ibmr.lkey = mr->mmr.key;
	mr->ibmr.rkey = mr->mmr.key;

	return &mr->ibmr;

error:
	ib_umem_release(umem);
	return ERR_PTR(err);
}

static int unreg_umr(struct mlx5_ib_dev *dev, struct mlx5_ib_mr *mr)
{
	struct umr_common *umrc = &dev->umrc;
941
	struct mlx5_ib_umr_context umr_context;
942 943 944 945
	struct ib_send_wr wr, *bad;
	int err;

	memset(&wr, 0, sizeof(wr));
946
	wr.wr_id = (u64)(unsigned long)&umr_context;
947 948
	prep_umr_unreg_wqe(dev, &wr, mr->mmr.key);

949
	mlx5_ib_init_umr_context(&umr_context);
950 951 952 953 954 955
	down(&umrc->sem);
	err = ib_post_send(umrc->qp, &wr, &bad);
	if (err) {
		up(&umrc->sem);
		mlx5_ib_dbg(dev, "err %d\n", err);
		goto error;
956 957 958
	} else {
		wait_for_completion(&umr_context.done);
		up(&umrc->sem);
959
	}
960
	if (umr_context.status != IB_WC_SUCCESS) {
961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008
		mlx5_ib_warn(dev, "unreg umr failed\n");
		err = -EFAULT;
		goto error;
	}
	return 0;

error:
	return err;
}

int mlx5_ib_dereg_mr(struct ib_mr *ibmr)
{
	struct mlx5_ib_dev *dev = to_mdev(ibmr->device);
	struct mlx5_ib_mr *mr = to_mmr(ibmr);
	struct ib_umem *umem = mr->umem;
	int npages = mr->npages;
	int umred = mr->umred;
	int err;

	if (!umred) {
		err = mlx5_core_destroy_mkey(&dev->mdev, &mr->mmr);
		if (err) {
			mlx5_ib_warn(dev, "failed to destroy mkey 0x%x (%d)\n",
				     mr->mmr.key, err);
			return err;
		}
	} else {
		err = unreg_umr(dev, mr);
		if (err) {
			mlx5_ib_warn(dev, "failed unregister\n");
			return err;
		}
		free_cached_mr(dev, mr);
	}

	if (umem) {
		ib_umem_release(umem);
		spin_lock(&dev->mr_lock);
		dev->mdev.priv.reg_pages -= npages;
		spin_unlock(&dev->mr_lock);
	}

	if (!umred)
		kfree(mr);

	return 0;
}

1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054
struct ib_mr *mlx5_ib_create_mr(struct ib_pd *pd,
				struct ib_mr_init_attr *mr_init_attr)
{
	struct mlx5_ib_dev *dev = to_mdev(pd->device);
	struct mlx5_create_mkey_mbox_in *in;
	struct mlx5_ib_mr *mr;
	int access_mode, err;
	int ndescs = roundup(mr_init_attr->max_reg_descriptors, 4);

	mr = kzalloc(sizeof(*mr), GFP_KERNEL);
	if (!mr)
		return ERR_PTR(-ENOMEM);

	in = kzalloc(sizeof(*in), GFP_KERNEL);
	if (!in) {
		err = -ENOMEM;
		goto err_free;
	}

	in->seg.status = 1 << 6; /* free */
	in->seg.xlt_oct_size = cpu_to_be32(ndescs);
	in->seg.qpn_mkey7_0 = cpu_to_be32(0xffffff << 8);
	in->seg.flags_pd = cpu_to_be32(to_mpd(pd)->pdn);
	access_mode = MLX5_ACCESS_MODE_MTT;

	if (mr_init_attr->flags & IB_MR_SIGNATURE_EN) {
		u32 psv_index[2];

		in->seg.flags_pd = cpu_to_be32(be32_to_cpu(in->seg.flags_pd) |
							   MLX5_MKEY_BSF_EN);
		in->seg.bsfs_octo_size = cpu_to_be32(MLX5_MKEY_BSF_OCTO_SIZE);
		mr->sig = kzalloc(sizeof(*mr->sig), GFP_KERNEL);
		if (!mr->sig) {
			err = -ENOMEM;
			goto err_free_in;
		}

		/* create mem & wire PSVs */
		err = mlx5_core_create_psv(&dev->mdev, to_mpd(pd)->pdn,
					   2, psv_index);
		if (err)
			goto err_free_sig;

		access_mode = MLX5_ACCESS_MODE_KLM;
		mr->sig->psv_memory.psv_idx = psv_index[0];
		mr->sig->psv_wire.psv_idx = psv_index[1];
1055 1056 1057 1058 1059

		mr->sig->sig_status_checked = true;
		mr->sig->sig_err_exists = false;
		/* Next UMR, Arm SIGERR */
		++mr->sig->sigerr_count;
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	}

	in->seg.flags = MLX5_PERM_UMR_EN | access_mode;
	err = mlx5_core_create_mkey(&dev->mdev, &mr->mmr, in, sizeof(*in),
				    NULL, NULL, NULL);
	if (err)
		goto err_destroy_psv;

	mr->ibmr.lkey = mr->mmr.key;
	mr->ibmr.rkey = mr->mmr.key;
	mr->umem = NULL;
	kfree(in);

	return &mr->ibmr;

err_destroy_psv:
	if (mr->sig) {
		if (mlx5_core_destroy_psv(&dev->mdev,
					  mr->sig->psv_memory.psv_idx))
			mlx5_ib_warn(dev, "failed to destroy mem psv %d\n",
				     mr->sig->psv_memory.psv_idx);
		if (mlx5_core_destroy_psv(&dev->mdev,
					  mr->sig->psv_wire.psv_idx))
			mlx5_ib_warn(dev, "failed to destroy wire psv %d\n",
				     mr->sig->psv_wire.psv_idx);
	}
err_free_sig:
	kfree(mr->sig);
err_free_in:
	kfree(in);
err_free:
	kfree(mr);
	return ERR_PTR(err);
}

int mlx5_ib_destroy_mr(struct ib_mr *ibmr)
{
	struct mlx5_ib_dev *dev = to_mdev(ibmr->device);
	struct mlx5_ib_mr *mr = to_mmr(ibmr);
	int err;

	if (mr->sig) {
		if (mlx5_core_destroy_psv(&dev->mdev,
					  mr->sig->psv_memory.psv_idx))
			mlx5_ib_warn(dev, "failed to destroy mem psv %d\n",
				     mr->sig->psv_memory.psv_idx);
		if (mlx5_core_destroy_psv(&dev->mdev,
					  mr->sig->psv_wire.psv_idx))
			mlx5_ib_warn(dev, "failed to destroy wire psv %d\n",
				     mr->sig->psv_wire.psv_idx);
		kfree(mr->sig);
	}

	err = mlx5_core_destroy_mkey(&dev->mdev, &mr->mmr);
	if (err) {
		mlx5_ib_warn(dev, "failed to destroy mkey 0x%x (%d)\n",
			     mr->mmr.key, err);
		return err;
	}

	kfree(mr);

	return err;
}

1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151
struct ib_mr *mlx5_ib_alloc_fast_reg_mr(struct ib_pd *pd,
					int max_page_list_len)
{
	struct mlx5_ib_dev *dev = to_mdev(pd->device);
	struct mlx5_create_mkey_mbox_in *in;
	struct mlx5_ib_mr *mr;
	int err;

	mr = kzalloc(sizeof(*mr), GFP_KERNEL);
	if (!mr)
		return ERR_PTR(-ENOMEM);

	in = kzalloc(sizeof(*in), GFP_KERNEL);
	if (!in) {
		err = -ENOMEM;
		goto err_free;
	}

	in->seg.status = 1 << 6; /* free */
	in->seg.xlt_oct_size = cpu_to_be32((max_page_list_len + 1) / 2);
	in->seg.qpn_mkey7_0 = cpu_to_be32(0xffffff << 8);
	in->seg.flags = MLX5_PERM_UMR_EN | MLX5_ACCESS_MODE_MTT;
	in->seg.flags_pd = cpu_to_be32(to_mpd(pd)->pdn);
	/*
	 * TBD not needed - issue 197292 */
	in->seg.log2_page_size = PAGE_SHIFT;

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Eli Cohen 已提交
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	err = mlx5_core_create_mkey(&dev->mdev, &mr->mmr, in, sizeof(*in), NULL,
				    NULL, NULL);
1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209
	kfree(in);
	if (err)
		goto err_free;

	mr->ibmr.lkey = mr->mmr.key;
	mr->ibmr.rkey = mr->mmr.key;
	mr->umem = NULL;

	return &mr->ibmr;

err_free:
	kfree(mr);
	return ERR_PTR(err);
}

struct ib_fast_reg_page_list *mlx5_ib_alloc_fast_reg_page_list(struct ib_device *ibdev,
							       int page_list_len)
{
	struct mlx5_ib_fast_reg_page_list *mfrpl;
	int size = page_list_len * sizeof(u64);

	mfrpl = kmalloc(sizeof(*mfrpl), GFP_KERNEL);
	if (!mfrpl)
		return ERR_PTR(-ENOMEM);

	mfrpl->ibfrpl.page_list = kmalloc(size, GFP_KERNEL);
	if (!mfrpl->ibfrpl.page_list)
		goto err_free;

	mfrpl->mapped_page_list = dma_alloc_coherent(ibdev->dma_device,
						     size, &mfrpl->map,
						     GFP_KERNEL);
	if (!mfrpl->mapped_page_list)
		goto err_free;

	WARN_ON(mfrpl->map & 0x3f);

	return &mfrpl->ibfrpl;

err_free:
	kfree(mfrpl->ibfrpl.page_list);
	kfree(mfrpl);
	return ERR_PTR(-ENOMEM);
}

void mlx5_ib_free_fast_reg_page_list(struct ib_fast_reg_page_list *page_list)
{
	struct mlx5_ib_fast_reg_page_list *mfrpl = to_mfrpl(page_list);
	struct mlx5_ib_dev *dev = to_mdev(page_list->device);
	int size = page_list->max_page_list_len * sizeof(u64);

	dma_free_coherent(&dev->mdev.pdev->dev, size, mfrpl->mapped_page_list,
			  mfrpl->map);
	kfree(mfrpl->ibfrpl.page_list);
	kfree(mfrpl);
}
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int mlx5_ib_check_mr_status(struct ib_mr *ibmr, u32 check_mask,
			    struct ib_mr_status *mr_status)
{
	struct mlx5_ib_mr *mmr = to_mmr(ibmr);
	int ret = 0;

	if (check_mask & ~IB_MR_CHECK_SIG_STATUS) {
		pr_err("Invalid status check mask\n");
		ret = -EINVAL;
		goto done;
	}

	mr_status->fail_status = 0;
	if (check_mask & IB_MR_CHECK_SIG_STATUS) {
		if (!mmr->sig) {
			ret = -EINVAL;
			pr_err("signature status check requested on a non-signature enabled MR\n");
			goto done;
		}

		mmr->sig->sig_status_checked = true;
		if (!mmr->sig->sig_err_exists)
			goto done;

		if (ibmr->lkey == mmr->sig->err_item.key)
			memcpy(&mr_status->sig_err, &mmr->sig->err_item,
			       sizeof(mr_status->sig_err));
		else {
			mr_status->sig_err.err_type = IB_SIG_BAD_GUARD;
			mr_status->sig_err.sig_err_offset = 0;
			mr_status->sig_err.key = mmr->sig->err_item.key;
		}

		mmr->sig->sig_err_exists = false;
		mr_status->fail_status |= IB_MR_CHECK_SIG_STATUS;
	}

done:
	return ret;
}