linux/drivers/net/mlx4/en_main.c
Yevgeny Petrilin b6b912e080 mlx4_en: Using real number of rings as RSS map size
There is no point in using more QPs then actual number of receive rings.
If the RSS function for two streams gives the same result modulo number
of rings, they will arrive to the same RX ring anyway.

Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-08-06 19:27:51 -07:00

282 lines
8 KiB
C

/*
* Copyright (c) 2007 Mellanox Technologies. 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/cpumask.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/mlx4/driver.h>
#include <linux/mlx4/device.h>
#include <linux/mlx4/cmd.h>
#include "mlx4_en.h"
MODULE_AUTHOR("Liran Liss, Yevgeny Petrilin");
MODULE_DESCRIPTION("Mellanox ConnectX HCA Ethernet driver");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_VERSION(DRV_VERSION " ("DRV_RELDATE")");
static const char mlx4_en_version[] =
DRV_NAME ": Mellanox ConnectX HCA Ethernet driver v"
DRV_VERSION " (" DRV_RELDATE ")\n";
#define MLX4_EN_PARM_INT(X, def_val, desc) \
static unsigned int X = def_val;\
module_param(X , uint, 0444); \
MODULE_PARM_DESC(X, desc);
/*
* Device scope module parameters
*/
/* Use a XOR rathern than Toeplitz hash function for RSS */
MLX4_EN_PARM_INT(rss_xor, 0, "Use XOR hash function for RSS");
/* RSS hash type mask - default to <saddr, daddr, sport, dport> */
MLX4_EN_PARM_INT(rss_mask, 0xf, "RSS hash type bitmask");
/* Number of LRO sessions per Rx ring (rounded up to a power of two) */
MLX4_EN_PARM_INT(num_lro, MLX4_EN_MAX_LRO_DESCRIPTORS,
"Number of LRO sessions per ring or disabled (0)");
/* Priority pausing */
MLX4_EN_PARM_INT(pfctx, 0, "Priority based Flow Control policy on TX[7:0]."
" Per priority bit mask");
MLX4_EN_PARM_INT(pfcrx, 0, "Priority based Flow Control policy on RX[7:0]."
" Per priority bit mask");
static int mlx4_en_get_profile(struct mlx4_en_dev *mdev)
{
struct mlx4_en_profile *params = &mdev->profile;
int i;
params->rss_xor = (rss_xor != 0);
params->rss_mask = rss_mask & 0x1f;
params->num_lro = min_t(int, num_lro , MLX4_EN_MAX_LRO_DESCRIPTORS);
for (i = 1; i <= MLX4_MAX_PORTS; i++) {
params->prof[i].rx_pause = 1;
params->prof[i].rx_ppp = pfcrx;
params->prof[i].tx_pause = 1;
params->prof[i].tx_ppp = pfctx;
params->prof[i].tx_ring_size = MLX4_EN_DEF_TX_RING_SIZE;
params->prof[i].rx_ring_size = MLX4_EN_DEF_RX_RING_SIZE;
params->prof[i].tx_ring_num = MLX4_EN_NUM_TX_RINGS +
(!!pfcrx) * MLX4_EN_NUM_PPP_RINGS;
}
return 0;
}
static void mlx4_en_event(struct mlx4_dev *dev, void *endev_ptr,
enum mlx4_dev_event event, int port)
{
struct mlx4_en_dev *mdev = (struct mlx4_en_dev *) endev_ptr;
struct mlx4_en_priv *priv;
if (!mdev->pndev[port])
return;
priv = netdev_priv(mdev->pndev[port]);
switch (event) {
case MLX4_DEV_EVENT_PORT_UP:
case MLX4_DEV_EVENT_PORT_DOWN:
/* To prevent races, we poll the link state in a separate
task rather than changing it here */
priv->link_state = event;
queue_work(mdev->workqueue, &priv->linkstate_task);
break;
case MLX4_DEV_EVENT_CATASTROPHIC_ERROR:
mlx4_err(mdev, "Internal error detected, restarting device\n");
break;
default:
mlx4_warn(mdev, "Unhandled event: %d\n", event);
}
}
static void mlx4_en_remove(struct mlx4_dev *dev, void *endev_ptr)
{
struct mlx4_en_dev *mdev = endev_ptr;
int i;
mutex_lock(&mdev->state_lock);
mdev->device_up = false;
mutex_unlock(&mdev->state_lock);
mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH)
if (mdev->pndev[i])
mlx4_en_destroy_netdev(mdev->pndev[i]);
flush_workqueue(mdev->workqueue);
destroy_workqueue(mdev->workqueue);
mlx4_mr_free(dev, &mdev->mr);
mlx4_uar_free(dev, &mdev->priv_uar);
mlx4_pd_free(dev, mdev->priv_pdn);
kfree(mdev);
}
static void *mlx4_en_add(struct mlx4_dev *dev)
{
static int mlx4_en_version_printed;
struct mlx4_en_dev *mdev;
int i;
int err;
if (!mlx4_en_version_printed) {
printk(KERN_INFO "%s", mlx4_en_version);
mlx4_en_version_printed++;
}
mdev = kzalloc(sizeof *mdev, GFP_KERNEL);
if (!mdev) {
dev_err(&dev->pdev->dev, "Device struct alloc failed, "
"aborting.\n");
err = -ENOMEM;
goto err_free_res;
}
if (mlx4_pd_alloc(dev, &mdev->priv_pdn))
goto err_free_dev;
if (mlx4_uar_alloc(dev, &mdev->priv_uar))
goto err_pd;
mdev->uar_map = ioremap(mdev->priv_uar.pfn << PAGE_SHIFT, PAGE_SIZE);
if (!mdev->uar_map)
goto err_uar;
spin_lock_init(&mdev->uar_lock);
mdev->dev = dev;
mdev->dma_device = &(dev->pdev->dev);
mdev->pdev = dev->pdev;
mdev->device_up = false;
mdev->LSO_support = !!(dev->caps.flags & (1 << 15));
if (!mdev->LSO_support)
mlx4_warn(mdev, "LSO not supported, please upgrade to later "
"FW version to enable LSO\n");
if (mlx4_mr_alloc(mdev->dev, mdev->priv_pdn, 0, ~0ull,
MLX4_PERM_LOCAL_WRITE | MLX4_PERM_LOCAL_READ,
0, 0, &mdev->mr)) {
mlx4_err(mdev, "Failed allocating memory region\n");
goto err_uar;
}
if (mlx4_mr_enable(mdev->dev, &mdev->mr)) {
mlx4_err(mdev, "Failed enabling memory region\n");
goto err_mr;
}
/* Build device profile according to supplied module parameters */
err = mlx4_en_get_profile(mdev);
if (err) {
mlx4_err(mdev, "Bad module parameters, aborting.\n");
goto err_mr;
}
/* Configure wich ports to start according to module parameters */
mdev->port_cnt = 0;
mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH)
mdev->port_cnt++;
/* If we did not receive an explicit number of Rx rings, default to
* the number of completion vectors populated by the mlx4_core */
mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) {
mlx4_info(mdev, "Using %d tx rings for port:%d\n",
mdev->profile.prof[i].tx_ring_num, i);
mdev->profile.prof[i].rx_ring_num = min_t(int,
roundup_pow_of_two(dev->caps.num_comp_vectors),
MAX_RX_RINGS);
mlx4_info(mdev, "Defaulting to %d rx rings for port:%d\n",
mdev->profile.prof[i].rx_ring_num, i);
}
/* Create our own workqueue for reset/multicast tasks
* Note: we cannot use the shared workqueue because of deadlocks caused
* by the rtnl lock */
mdev->workqueue = create_singlethread_workqueue("mlx4_en");
if (!mdev->workqueue) {
err = -ENOMEM;
goto err_mr;
}
/* At this stage all non-port specific tasks are complete:
* mark the card state as up */
mutex_init(&mdev->state_lock);
mdev->device_up = true;
/* Setup ports */
/* Create a netdev for each port */
mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) {
mlx4_info(mdev, "Activating port:%d\n", i);
if (mlx4_en_init_netdev(mdev, i, &mdev->profile.prof[i]))
mdev->pndev[i] = NULL;
}
return mdev;
err_mr:
mlx4_mr_free(dev, &mdev->mr);
err_uar:
mlx4_uar_free(dev, &mdev->priv_uar);
err_pd:
mlx4_pd_free(dev, mdev->priv_pdn);
err_free_dev:
kfree(mdev);
err_free_res:
return NULL;
}
static struct mlx4_interface mlx4_en_interface = {
.add = mlx4_en_add,
.remove = mlx4_en_remove,
.event = mlx4_en_event,
};
static int __init mlx4_en_init(void)
{
return mlx4_register_interface(&mlx4_en_interface);
}
static void __exit mlx4_en_cleanup(void)
{
mlx4_unregister_interface(&mlx4_en_interface);
}
module_init(mlx4_en_init);
module_exit(mlx4_en_cleanup);