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linux/drivers/net/mlx4/cq.c
Yevgeny Petrilin 0b7ca5a928 mlx4: Changing interrupt scheme 
Adding a pool of MSI-X vectors and EQs that can be used explicitly by mlx4_core
customers (mlx4_ib, mlx4_en). The consumers will assign their own names to the
interrupt vectors. Those vectors are not opened at mlx4 device initialization,
opened by demand.
Changed the max number of possible EQs according to the new scheme, no longer relies on
on number of cores.
The new functionality is exposed through mlx4_assign_eq() and mlx4_release_eq().
Customers that do not use the new API will get completion vectors as before.

Signed-off-by: Markuze Alex <markuze@mellanox.co.il>
Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il>
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-23 12:24:18 -07:00

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8.6 KiB
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/*
* Copyright (c) 2004, 2005 Topspin Communications. All rights reserved.
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
* Copyright (c) 2005, 2006, 2007 Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2005, 2006, 2007, 2008 Mellanox Technologies. All rights reserved.
* Copyright (c) 2004 Voltaire, 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/hardirq.h>
#include <linux/gfp.h>
#include <linux/mlx4/cmd.h>
#include <linux/mlx4/cq.h>
#include "mlx4.h"
#include "icm.h"
struct mlx4_cq_context {
__be32 flags;
u16 reserved1[3];
__be16 page_offset;
__be32 logsize_usrpage;
__be16 cq_period;
__be16 cq_max_count;
u8 reserved2[3];
u8 comp_eqn;
u8 log_page_size;
u8 reserved3[2];
u8 mtt_base_addr_h;
__be32 mtt_base_addr_l;
__be32 last_notified_index;
__be32 solicit_producer_index;
__be32 consumer_index;
__be32 producer_index;
u32 reserved4[2];
__be64 db_rec_addr;
};
#define MLX4_CQ_STATUS_OK ( 0 << 28)
#define MLX4_CQ_STATUS_OVERFLOW ( 9 << 28)
#define MLX4_CQ_STATUS_WRITE_FAIL (10 << 28)
#define MLX4_CQ_FLAG_CC ( 1 << 18)
#define MLX4_CQ_FLAG_OI ( 1 << 17)
#define MLX4_CQ_STATE_ARMED ( 9 << 8)
#define MLX4_CQ_STATE_ARMED_SOL ( 6 << 8)
#define MLX4_EQ_STATE_FIRED (10 << 8)
void mlx4_cq_completion(struct mlx4_dev *dev, u32 cqn)
{
struct mlx4_cq *cq;
cq = radix_tree_lookup(&mlx4_priv(dev)->cq_table.tree,
cqn & (dev->caps.num_cqs - 1));
if (!cq) {
mlx4_warn(dev, "Completion event for bogus CQ %08x\n", cqn);
return;
}
++cq->arm_sn;
cq->comp(cq);
}
void mlx4_cq_event(struct mlx4_dev *dev, u32 cqn, int event_type)
{
struct mlx4_cq_table *cq_table = &mlx4_priv(dev)->cq_table;
struct mlx4_cq *cq;
spin_lock(&cq_table->lock);
cq = radix_tree_lookup(&cq_table->tree, cqn & (dev->caps.num_cqs - 1));
if (cq)
atomic_inc(&cq->refcount);
spin_unlock(&cq_table->lock);
if (!cq) {
mlx4_warn(dev, "Async event for bogus CQ %08x\n", cqn);
return;
}
cq->event(cq, event_type);
if (atomic_dec_and_test(&cq->refcount))
complete(&cq->free);
}
static int mlx4_SW2HW_CQ(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
int cq_num)
{
return mlx4_cmd(dev, mailbox->dma, cq_num, 0, MLX4_CMD_SW2HW_CQ,
MLX4_CMD_TIME_CLASS_A);
}
static int mlx4_MODIFY_CQ(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
int cq_num, u32 opmod)
{
return mlx4_cmd(dev, mailbox->dma, cq_num, opmod, MLX4_CMD_MODIFY_CQ,
MLX4_CMD_TIME_CLASS_A);
}
static int mlx4_HW2SW_CQ(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
int cq_num)
{
return mlx4_cmd_box(dev, 0, mailbox ? mailbox->dma : 0, cq_num,
mailbox ? 0 : 1, MLX4_CMD_HW2SW_CQ,
MLX4_CMD_TIME_CLASS_A);
}
int mlx4_cq_modify(struct mlx4_dev *dev, struct mlx4_cq *cq,
u16 count, u16 period)
{
struct mlx4_cmd_mailbox *mailbox;
struct mlx4_cq_context *cq_context;
int err;
mailbox = mlx4_alloc_cmd_mailbox(dev);
if (IS_ERR(mailbox))
return PTR_ERR(mailbox);
cq_context = mailbox->buf;
memset(cq_context, 0, sizeof *cq_context);
cq_context->cq_max_count = cpu_to_be16(count);
cq_context->cq_period = cpu_to_be16(period);
err = mlx4_MODIFY_CQ(dev, mailbox, cq->cqn, 1);
mlx4_free_cmd_mailbox(dev, mailbox);
return err;
}
EXPORT_SYMBOL_GPL(mlx4_cq_modify);
int mlx4_cq_resize(struct mlx4_dev *dev, struct mlx4_cq *cq,
int entries, struct mlx4_mtt *mtt)
{
struct mlx4_cmd_mailbox *mailbox;
struct mlx4_cq_context *cq_context;
u64 mtt_addr;
int err;
mailbox = mlx4_alloc_cmd_mailbox(dev);
if (IS_ERR(mailbox))
return PTR_ERR(mailbox);
cq_context = mailbox->buf;
memset(cq_context, 0, sizeof *cq_context);
cq_context->logsize_usrpage = cpu_to_be32(ilog2(entries) << 24);
cq_context->log_page_size = mtt->page_shift - 12;
mtt_addr = mlx4_mtt_addr(dev, mtt);
cq_context->mtt_base_addr_h = mtt_addr >> 32;
cq_context->mtt_base_addr_l = cpu_to_be32(mtt_addr & 0xffffffff);
err = mlx4_MODIFY_CQ(dev, mailbox, cq->cqn, 0);
mlx4_free_cmd_mailbox(dev, mailbox);
return err;
}
EXPORT_SYMBOL_GPL(mlx4_cq_resize);
int mlx4_cq_alloc(struct mlx4_dev *dev, int nent, struct mlx4_mtt *mtt,
struct mlx4_uar *uar, u64 db_rec, struct mlx4_cq *cq,
unsigned vector, int collapsed)
{
struct mlx4_priv *priv = mlx4_priv(dev);
struct mlx4_cq_table *cq_table = &priv->cq_table;
struct mlx4_cmd_mailbox *mailbox;
struct mlx4_cq_context *cq_context;
u64 mtt_addr;
int err;
if (vector > dev->caps.num_comp_vectors + dev->caps.comp_pool)
return -EINVAL;
cq->vector = vector;
cq->cqn = mlx4_bitmap_alloc(&cq_table->bitmap);
if (cq->cqn == -1)
return -ENOMEM;
err = mlx4_table_get(dev, &cq_table->table, cq->cqn);
if (err)
goto err_out;
err = mlx4_table_get(dev, &cq_table->cmpt_table, cq->cqn);
if (err)
goto err_put;
spin_lock_irq(&cq_table->lock);
err = radix_tree_insert(&cq_table->tree, cq->cqn, cq);
spin_unlock_irq(&cq_table->lock);
if (err)
goto err_cmpt_put;
mailbox = mlx4_alloc_cmd_mailbox(dev);
if (IS_ERR(mailbox)) {
err = PTR_ERR(mailbox);
goto err_radix;
}
cq_context = mailbox->buf;
memset(cq_context, 0, sizeof *cq_context);
cq_context->flags = cpu_to_be32(!!collapsed << 18);
cq_context->logsize_usrpage = cpu_to_be32((ilog2(nent) << 24) | uar->index);
cq_context->comp_eqn = priv->eq_table.eq[vector].eqn;
cq_context->log_page_size = mtt->page_shift - MLX4_ICM_PAGE_SHIFT;
mtt_addr = mlx4_mtt_addr(dev, mtt);
cq_context->mtt_base_addr_h = mtt_addr >> 32;
cq_context->mtt_base_addr_l = cpu_to_be32(mtt_addr & 0xffffffff);
cq_context->db_rec_addr = cpu_to_be64(db_rec);
err = mlx4_SW2HW_CQ(dev, mailbox, cq->cqn);
mlx4_free_cmd_mailbox(dev, mailbox);
if (err)
goto err_radix;
cq->cons_index = 0;
cq->arm_sn = 1;
cq->uar = uar;
atomic_set(&cq->refcount, 1);
init_completion(&cq->free);
return 0;
err_radix:
spin_lock_irq(&cq_table->lock);
radix_tree_delete(&cq_table->tree, cq->cqn);
spin_unlock_irq(&cq_table->lock);
err_cmpt_put:
mlx4_table_put(dev, &cq_table->cmpt_table, cq->cqn);
err_put:
mlx4_table_put(dev, &cq_table->table, cq->cqn);
err_out:
mlx4_bitmap_free(&cq_table->bitmap, cq->cqn);
return err;
}
EXPORT_SYMBOL_GPL(mlx4_cq_alloc);
void mlx4_cq_free(struct mlx4_dev *dev, struct mlx4_cq *cq)
{
struct mlx4_priv *priv = mlx4_priv(dev);
struct mlx4_cq_table *cq_table = &priv->cq_table;
int err;
err = mlx4_HW2SW_CQ(dev, NULL, cq->cqn);
if (err)
mlx4_warn(dev, "HW2SW_CQ failed (%d) for CQN %06x\n", err, cq->cqn);
synchronize_irq(priv->eq_table.eq[cq->vector].irq);
spin_lock_irq(&cq_table->lock);
radix_tree_delete(&cq_table->tree, cq->cqn);
spin_unlock_irq(&cq_table->lock);
if (atomic_dec_and_test(&cq->refcount))
complete(&cq->free);
wait_for_completion(&cq->free);
mlx4_table_put(dev, &cq_table->table, cq->cqn);
mlx4_bitmap_free(&cq_table->bitmap, cq->cqn);
}
EXPORT_SYMBOL_GPL(mlx4_cq_free);
int mlx4_init_cq_table(struct mlx4_dev *dev)
{
struct mlx4_cq_table *cq_table = &mlx4_priv(dev)->cq_table;
int err;
spin_lock_init(&cq_table->lock);
INIT_RADIX_TREE(&cq_table->tree, GFP_ATOMIC);
err = mlx4_bitmap_init(&cq_table->bitmap, dev->caps.num_cqs,
dev->caps.num_cqs - 1, dev->caps.reserved_cqs, 0);
if (err)
return err;
return 0;
}
void mlx4_cleanup_cq_table(struct mlx4_dev *dev)
{
/* Nothing to do to clean up radix_tree */
mlx4_bitmap_cleanup(&mlx4_priv(dev)->cq_table.bitmap);
}
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