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linux_dsm_epyc7002/drivers/net/ethernet/mellanox/mlx4/qp.c
Jack Morgenstein d546b67cda net/mlx4: Fix irq-unsafe spinlock usage 
spin_lock/unlock was used instead of spin_un/lock_irq
in a procedure used in process space, on a spinlock
which can be grabbed in an interrupt.

This caused the stack trace below to be displayed (on kernel
4.17.0-rc1 compiled with Lock Debugging enabled):

[  154.661474] WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
[  154.668909] 4.17.0-rc1-rdma_rc_mlx+ #3 Tainted: G          I
[  154.675856] -----------------------------------------------------
[  154.682706] modprobe/10159 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
[  154.690254] 00000000f3b0e495 (&(&qp_table->lock)->rlock){+.+.}, at: mlx4_qp_remove+0x20/0x50 [mlx4_core]
[  154.700927]
and this task is already holding:
[  154.707461] 0000000094373b5d (&(&cq->lock)->rlock/1){....}, at: destroy_qp_common+0x111/0x560 [mlx4_ib]
[  154.718028] which would create a new lock dependency:
[  154.723705]  (&(&cq->lock)->rlock/1){....} -> (&(&qp_table->lock)->rlock){+.+.}
[  154.731922]
but this new dependency connects a SOFTIRQ-irq-safe lock:
[  154.740798]  (&(&cq->lock)->rlock){..-.}
[  154.740800]
... which became SOFTIRQ-irq-safe at:
[  154.752163]   _raw_spin_lock_irqsave+0x3e/0x50
[  154.757163]   mlx4_ib_poll_cq+0x36/0x900 [mlx4_ib]
[  154.762554]   ipoib_tx_poll+0x4a/0xf0 [ib_ipoib]
...
to a SOFTIRQ-irq-unsafe lock:
[  154.815603]  (&(&qp_table->lock)->rlock){+.+.}
[  154.815604]
... which became SOFTIRQ-irq-unsafe at:
[  154.827718] ...
[  154.827720]   _raw_spin_lock+0x35/0x50
[  154.833912]   mlx4_qp_lookup+0x1e/0x50 [mlx4_core]
[  154.839302]   mlx4_flow_attach+0x3f/0x3d0 [mlx4_core]

Since mlx4_qp_lookup() is called only in process space, we can
simply replace the spin_un/lock calls with spin_un/lock_irq calls.

Fixes: 6dc06c08be ("net/mlx4: Fix the check in attaching steering rules")
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-23 15:48:58 -04:00

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/*
* Copyright (c) 2004 Topspin Communications. 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/gfp.h>
#include <linux/export.h>
#include <linux/mlx4/cmd.h>
#include <linux/mlx4/qp.h>
#include "mlx4.h"
#include "icm.h"
/* QP to support BF should have bits 6,7 cleared */
#define MLX4_BF_QP_SKIP_MASK 0xc0
#define MLX4_MAX_BF_QP_RANGE 0x40
void mlx4_qp_event(struct mlx4_dev *dev, u32 qpn, int event_type)
{
struct mlx4_qp_table *qp_table = &mlx4_priv(dev)->qp_table;
struct mlx4_qp *qp;
spin_lock(&qp_table->lock);
qp = __mlx4_qp_lookup(dev, qpn);
if (qp)
refcount_inc(&qp->refcount);
spin_unlock(&qp_table->lock);
if (!qp) {
mlx4_dbg(dev, "Async event for none existent QP %08x\n", qpn);
return;
}
qp->event(qp, event_type);
if (refcount_dec_and_test(&qp->refcount))
complete(&qp->free);
}
/* used for INIT/CLOSE port logic */
static int is_master_qp0(struct mlx4_dev *dev, struct mlx4_qp *qp, int *real_qp0, int *proxy_qp0)
{
/* this procedure is called after we already know we are on the master */
/* qp0 is either the proxy qp0, or the real qp0 */
u32 pf_proxy_offset = dev->phys_caps.base_proxy_sqpn + 8 * mlx4_master_func_num(dev);
*proxy_qp0 = qp->qpn >= pf_proxy_offset && qp->qpn <= pf_proxy_offset + 1;
*real_qp0 = qp->qpn >= dev->phys_caps.base_sqpn &&
qp->qpn <= dev->phys_caps.base_sqpn + 1;
return *real_qp0 || *proxy_qp0;
}
static int __mlx4_qp_modify(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
enum mlx4_qp_state cur_state, enum mlx4_qp_state new_state,
struct mlx4_qp_context *context,
enum mlx4_qp_optpar optpar,
int sqd_event, struct mlx4_qp *qp, int native)
{
static const u16 op[MLX4_QP_NUM_STATE][MLX4_QP_NUM_STATE] = {
[MLX4_QP_STATE_RST] = {
[MLX4_QP_STATE_RST] = MLX4_CMD_2RST_QP,
[MLX4_QP_STATE_ERR] = MLX4_CMD_2ERR_QP,
[MLX4_QP_STATE_INIT] = MLX4_CMD_RST2INIT_QP,
},
[MLX4_QP_STATE_INIT] = {
[MLX4_QP_STATE_RST] = MLX4_CMD_2RST_QP,
[MLX4_QP_STATE_ERR] = MLX4_CMD_2ERR_QP,
[MLX4_QP_STATE_INIT] = MLX4_CMD_INIT2INIT_QP,
[MLX4_QP_STATE_RTR] = MLX4_CMD_INIT2RTR_QP,
},
[MLX4_QP_STATE_RTR] = {
[MLX4_QP_STATE_RST] = MLX4_CMD_2RST_QP,
[MLX4_QP_STATE_ERR] = MLX4_CMD_2ERR_QP,
[MLX4_QP_STATE_RTS] = MLX4_CMD_RTR2RTS_QP,
},
[MLX4_QP_STATE_RTS] = {
[MLX4_QP_STATE_RST] = MLX4_CMD_2RST_QP,
[MLX4_QP_STATE_ERR] = MLX4_CMD_2ERR_QP,
[MLX4_QP_STATE_RTS] = MLX4_CMD_RTS2RTS_QP,
[MLX4_QP_STATE_SQD] = MLX4_CMD_RTS2SQD_QP,
},
[MLX4_QP_STATE_SQD] = {
[MLX4_QP_STATE_RST] = MLX4_CMD_2RST_QP,
[MLX4_QP_STATE_ERR] = MLX4_CMD_2ERR_QP,
[MLX4_QP_STATE_RTS] = MLX4_CMD_SQD2RTS_QP,
[MLX4_QP_STATE_SQD] = MLX4_CMD_SQD2SQD_QP,
},
[MLX4_QP_STATE_SQER] = {
[MLX4_QP_STATE_RST] = MLX4_CMD_2RST_QP,
[MLX4_QP_STATE_ERR] = MLX4_CMD_2ERR_QP,
[MLX4_QP_STATE_RTS] = MLX4_CMD_SQERR2RTS_QP,
},
[MLX4_QP_STATE_ERR] = {
[MLX4_QP_STATE_RST] = MLX4_CMD_2RST_QP,
[MLX4_QP_STATE_ERR] = MLX4_CMD_2ERR_QP,
}
};
struct mlx4_priv *priv = mlx4_priv(dev);
struct mlx4_cmd_mailbox *mailbox;
int ret = 0;
int real_qp0 = 0;
int proxy_qp0 = 0;
u8 port;
if (cur_state >= MLX4_QP_NUM_STATE || new_state >= MLX4_QP_NUM_STATE ||
!op[cur_state][new_state])
return -EINVAL;
if (op[cur_state][new_state] == MLX4_CMD_2RST_QP) {
ret = mlx4_cmd(dev, 0, qp->qpn, 2,
MLX4_CMD_2RST_QP, MLX4_CMD_TIME_CLASS_A, native);
if (mlx4_is_master(dev) && cur_state != MLX4_QP_STATE_ERR &&
cur_state != MLX4_QP_STATE_RST &&
is_master_qp0(dev, qp, &real_qp0, &proxy_qp0)) {
port = (qp->qpn & 1) + 1;
if (proxy_qp0)
priv->mfunc.master.qp0_state[port].proxy_qp0_active = 0;
else
priv->mfunc.master.qp0_state[port].qp0_active = 0;
}
return ret;
}
mailbox = mlx4_alloc_cmd_mailbox(dev);
if (IS_ERR(mailbox))
return PTR_ERR(mailbox);
if (cur_state == MLX4_QP_STATE_RST && new_state == MLX4_QP_STATE_INIT) {
u64 mtt_addr = mlx4_mtt_addr(dev, mtt);
context->mtt_base_addr_h = mtt_addr >> 32;
context->mtt_base_addr_l = cpu_to_be32(mtt_addr & 0xffffffff);
context->log_page_size = mtt->page_shift - MLX4_ICM_PAGE_SHIFT;
}
if ((cur_state == MLX4_QP_STATE_RTR) &&
(new_state == MLX4_QP_STATE_RTS) &&
dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_ROCE_V1_V2)
context->roce_entropy =
cpu_to_be16(mlx4_qp_roce_entropy(dev, qp->qpn));
*(__be32 *) mailbox->buf = cpu_to_be32(optpar);
memcpy(mailbox->buf + 8, context, sizeof(*context));
((struct mlx4_qp_context *) (mailbox->buf + 8))->local_qpn =
cpu_to_be32(qp->qpn);
ret = mlx4_cmd(dev, mailbox->dma,
qp->qpn | (!!sqd_event << 31),
new_state == MLX4_QP_STATE_RST ? 2 : 0,
op[cur_state][new_state], MLX4_CMD_TIME_CLASS_C, native);
if (mlx4_is_master(dev) && is_master_qp0(dev, qp, &real_qp0, &proxy_qp0)) {
port = (qp->qpn & 1) + 1;
if (cur_state != MLX4_QP_STATE_ERR &&
cur_state != MLX4_QP_STATE_RST &&
new_state == MLX4_QP_STATE_ERR) {
if (proxy_qp0)
priv->mfunc.master.qp0_state[port].proxy_qp0_active = 0;
else
priv->mfunc.master.qp0_state[port].qp0_active = 0;
} else if (new_state == MLX4_QP_STATE_RTR) {
if (proxy_qp0)
priv->mfunc.master.qp0_state[port].proxy_qp0_active = 1;
else
priv->mfunc.master.qp0_state[port].qp0_active = 1;
}
}
mlx4_free_cmd_mailbox(dev, mailbox);
return ret;
}
int mlx4_qp_modify(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
enum mlx4_qp_state cur_state, enum mlx4_qp_state new_state,
struct mlx4_qp_context *context,
enum mlx4_qp_optpar optpar,
int sqd_event, struct mlx4_qp *qp)
{
return __mlx4_qp_modify(dev, mtt, cur_state, new_state, context,
optpar, sqd_event, qp, 0);
}
EXPORT_SYMBOL_GPL(mlx4_qp_modify);
int __mlx4_qp_reserve_range(struct mlx4_dev *dev, int cnt, int align,
int *base, u8 flags)
{
u32 uid;
int bf_qp = !!(flags & (u8)MLX4_RESERVE_ETH_BF_QP);
struct mlx4_priv *priv = mlx4_priv(dev);
struct mlx4_qp_table *qp_table = &priv->qp_table;
if (cnt > MLX4_MAX_BF_QP_RANGE && bf_qp)
return -ENOMEM;
uid = MLX4_QP_TABLE_ZONE_GENERAL;
if (flags & (u8)MLX4_RESERVE_A0_QP) {
if (bf_qp)
uid = MLX4_QP_TABLE_ZONE_RAW_ETH;
else
uid = MLX4_QP_TABLE_ZONE_RSS;
}
*base = mlx4_zone_alloc_entries(qp_table->zones, uid, cnt, align,
bf_qp ? MLX4_BF_QP_SKIP_MASK : 0, NULL);
if (*base == -1)
return -ENOMEM;
return 0;
}
int mlx4_qp_reserve_range(struct mlx4_dev *dev, int cnt, int align,
int *base, u8 flags, u8 usage)
{
u32 in_modifier = RES_QP | (((u32)usage & 3) << 30);
u64 in_param = 0;
u64 out_param;
int err;
/* Turn off all unsupported QP allocation flags */
flags &= dev->caps.alloc_res_qp_mask;
if (mlx4_is_mfunc(dev)) {
set_param_l(&in_param, (((u32)flags) << 24) | (u32)cnt);
set_param_h(&in_param, align);
err = mlx4_cmd_imm(dev, in_param, &out_param,
in_modifier, RES_OP_RESERVE,
MLX4_CMD_ALLOC_RES,
MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED);
if (err)
return err;
*base = get_param_l(&out_param);
return 0;
}
return __mlx4_qp_reserve_range(dev, cnt, align, base, flags);
}
EXPORT_SYMBOL_GPL(mlx4_qp_reserve_range);
void __mlx4_qp_release_range(struct mlx4_dev *dev, int base_qpn, int cnt)
{
struct mlx4_priv *priv = mlx4_priv(dev);
struct mlx4_qp_table *qp_table = &priv->qp_table;
if (mlx4_is_qp_reserved(dev, (u32) base_qpn))
return;
mlx4_zone_free_entries_unique(qp_table->zones, base_qpn, cnt);
}
void mlx4_qp_release_range(struct mlx4_dev *dev, int base_qpn, int cnt)
{
u64 in_param = 0;
int err;
if (!cnt)
return;
if (mlx4_is_mfunc(dev)) {
set_param_l(&in_param, base_qpn);
set_param_h(&in_param, cnt);
err = mlx4_cmd(dev, in_param, RES_QP, RES_OP_RESERVE,
MLX4_CMD_FREE_RES,
MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED);
if (err) {
mlx4_warn(dev, "Failed to release qp range base:%d cnt:%d\n",
base_qpn, cnt);
}
} else
__mlx4_qp_release_range(dev, base_qpn, cnt);
}
EXPORT_SYMBOL_GPL(mlx4_qp_release_range);
int __mlx4_qp_alloc_icm(struct mlx4_dev *dev, int qpn)
{
struct mlx4_priv *priv = mlx4_priv(dev);
struct mlx4_qp_table *qp_table = &priv->qp_table;
int err;
err = mlx4_table_get(dev, &qp_table->qp_table, qpn);
if (err)
goto err_out;
err = mlx4_table_get(dev, &qp_table->auxc_table, qpn);
if (err)
goto err_put_qp;
err = mlx4_table_get(dev, &qp_table->altc_table, qpn);
if (err)
goto err_put_auxc;
err = mlx4_table_get(dev, &qp_table->rdmarc_table, qpn);
if (err)
goto err_put_altc;
err = mlx4_table_get(dev, &qp_table->cmpt_table, qpn);
if (err)
goto err_put_rdmarc;
return 0;
err_put_rdmarc:
mlx4_table_put(dev, &qp_table->rdmarc_table, qpn);
err_put_altc:
mlx4_table_put(dev, &qp_table->altc_table, qpn);
err_put_auxc:
mlx4_table_put(dev, &qp_table->auxc_table, qpn);
err_put_qp:
mlx4_table_put(dev, &qp_table->qp_table, qpn);
err_out:
return err;
}
static int mlx4_qp_alloc_icm(struct mlx4_dev *dev, int qpn)
{
u64 param = 0;
if (mlx4_is_mfunc(dev)) {
set_param_l(&param, qpn);
return mlx4_cmd_imm(dev, param, &param, RES_QP, RES_OP_MAP_ICM,
MLX4_CMD_ALLOC_RES, MLX4_CMD_TIME_CLASS_A,
MLX4_CMD_WRAPPED);
}
return __mlx4_qp_alloc_icm(dev, qpn);
}
void __mlx4_qp_free_icm(struct mlx4_dev *dev, int qpn)
{
struct mlx4_priv *priv = mlx4_priv(dev);
struct mlx4_qp_table *qp_table = &priv->qp_table;
mlx4_table_put(dev, &qp_table->cmpt_table, qpn);
mlx4_table_put(dev, &qp_table->rdmarc_table, qpn);
mlx4_table_put(dev, &qp_table->altc_table, qpn);
mlx4_table_put(dev, &qp_table->auxc_table, qpn);
mlx4_table_put(dev, &qp_table->qp_table, qpn);
}
static void mlx4_qp_free_icm(struct mlx4_dev *dev, int qpn)
{
u64 in_param = 0;
if (mlx4_is_mfunc(dev)) {
set_param_l(&in_param, qpn);
if (mlx4_cmd(dev, in_param, RES_QP, RES_OP_MAP_ICM,
MLX4_CMD_FREE_RES, MLX4_CMD_TIME_CLASS_A,
MLX4_CMD_WRAPPED))
mlx4_warn(dev, "Failed to free icm of qp:%d\n", qpn);
} else
__mlx4_qp_free_icm(dev, qpn);
}
struct mlx4_qp *mlx4_qp_lookup(struct mlx4_dev *dev, u32 qpn)
{
struct mlx4_qp_table *qp_table = &mlx4_priv(dev)->qp_table;
struct mlx4_qp *qp;
spin_lock_irq(&qp_table->lock);
qp = __mlx4_qp_lookup(dev, qpn);
spin_unlock_irq(&qp_table->lock);
return qp;
}
int mlx4_qp_alloc(struct mlx4_dev *dev, int qpn, struct mlx4_qp *qp)
{
struct mlx4_priv *priv = mlx4_priv(dev);
struct mlx4_qp_table *qp_table = &priv->qp_table;
int err;
if (!qpn)
return -EINVAL;
qp->qpn = qpn;
err = mlx4_qp_alloc_icm(dev, qpn);
if (err)
return err;
spin_lock_irq(&qp_table->lock);
err = radix_tree_insert(&dev->qp_table_tree, qp->qpn &
(dev->caps.num_qps - 1), qp);
spin_unlock_irq(&qp_table->lock);
if (err)
goto err_icm;
refcount_set(&qp->refcount, 1);
init_completion(&qp->free);
return 0;
err_icm:
mlx4_qp_free_icm(dev, qpn);
return err;
}
EXPORT_SYMBOL_GPL(mlx4_qp_alloc);
int mlx4_update_qp(struct mlx4_dev *dev, u32 qpn,
enum mlx4_update_qp_attr attr,
struct mlx4_update_qp_params *params)
{
struct mlx4_cmd_mailbox *mailbox;
struct mlx4_update_qp_context *cmd;
u64 pri_addr_path_mask = 0;
u64 qp_mask = 0;
int err = 0;
if (!attr || (attr & ~MLX4_UPDATE_QP_SUPPORTED_ATTRS))
return -EINVAL;
mailbox = mlx4_alloc_cmd_mailbox(dev);
if (IS_ERR(mailbox))
return PTR_ERR(mailbox);
cmd = (struct mlx4_update_qp_context *)mailbox->buf;
if (attr & MLX4_UPDATE_QP_SMAC) {
pri_addr_path_mask |= 1ULL << MLX4_UPD_QP_PATH_MASK_MAC_INDEX;
cmd->qp_context.pri_path.grh_mylmc = params->smac_index;
}
if (attr & MLX4_UPDATE_QP_ETH_SRC_CHECK_MC_LB) {
if (!(dev->caps.flags2
& MLX4_DEV_CAP_FLAG2_UPDATE_QP_SRC_CHECK_LB)) {
mlx4_warn(dev,
"Trying to set src check LB, but it isn't supported\n");
err = -EOPNOTSUPP;
goto out;
}
pri_addr_path_mask |=
1ULL << MLX4_UPD_QP_PATH_MASK_ETH_SRC_CHECK_MC_LB;
if (params->flags &
MLX4_UPDATE_QP_PARAMS_FLAGS_ETH_CHECK_MC_LB) {
cmd->qp_context.pri_path.fl |=
MLX4_FL_ETH_SRC_CHECK_MC_LB;
}
}
if (attr & MLX4_UPDATE_QP_VSD) {
qp_mask |= 1ULL << MLX4_UPD_QP_MASK_VSD;
if (params->flags & MLX4_UPDATE_QP_PARAMS_FLAGS_VSD_ENABLE)
cmd->qp_context.param3 |= cpu_to_be32(MLX4_STRIP_VLAN);
}
if (attr & MLX4_UPDATE_QP_RATE_LIMIT) {
qp_mask |= 1ULL << MLX4_UPD_QP_MASK_RATE_LIMIT;
cmd->qp_context.rate_limit_params = cpu_to_be16((params->rate_unit << 14) | params->rate_val);
}
if (attr & MLX4_UPDATE_QP_QOS_VPORT) {
if (!(dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_QOS_VPP)) {
mlx4_warn(dev, "Granular QoS per VF is not enabled\n");
err = -EOPNOTSUPP;
goto out;
}
qp_mask |= 1ULL << MLX4_UPD_QP_MASK_QOS_VPP;
cmd->qp_context.qos_vport = params->qos_vport;
}
cmd->primary_addr_path_mask = cpu_to_be64(pri_addr_path_mask);
cmd->qp_mask = cpu_to_be64(qp_mask);
err = mlx4_cmd(dev, mailbox->dma, qpn & 0xffffff, 0,
MLX4_CMD_UPDATE_QP, MLX4_CMD_TIME_CLASS_A,
MLX4_CMD_NATIVE);
out:
mlx4_free_cmd_mailbox(dev, mailbox);
return err;
}
EXPORT_SYMBOL_GPL(mlx4_update_qp);
void mlx4_qp_remove(struct mlx4_dev *dev, struct mlx4_qp *qp)
{
struct mlx4_qp_table *qp_table = &mlx4_priv(dev)->qp_table;
unsigned long flags;
spin_lock_irqsave(&qp_table->lock, flags);
radix_tree_delete(&dev->qp_table_tree, qp->qpn & (dev->caps.num_qps - 1));
spin_unlock_irqrestore(&qp_table->lock, flags);
}
EXPORT_SYMBOL_GPL(mlx4_qp_remove);
void mlx4_qp_free(struct mlx4_dev *dev, struct mlx4_qp *qp)
{
if (refcount_dec_and_test(&qp->refcount))
complete(&qp->free);
wait_for_completion(&qp->free);
mlx4_qp_free_icm(dev, qp->qpn);
}
EXPORT_SYMBOL_GPL(mlx4_qp_free);
static int mlx4_CONF_SPECIAL_QP(struct mlx4_dev *dev, u32 base_qpn)
{
return mlx4_cmd(dev, 0, base_qpn, 0, MLX4_CMD_CONF_SPECIAL_QP,
MLX4_CMD_TIME_CLASS_B, MLX4_CMD_NATIVE);
}
#define MLX4_QP_TABLE_RSS_ETH_PRIORITY 2
#define MLX4_QP_TABLE_RAW_ETH_PRIORITY 1
#define MLX4_QP_TABLE_RAW_ETH_SIZE 256
static int mlx4_create_zones(struct mlx4_dev *dev,
u32 reserved_bottom_general,
u32 reserved_top_general,
u32 reserved_bottom_rss,
u32 start_offset_rss,
u32 max_table_offset)
{
struct mlx4_qp_table *qp_table = &mlx4_priv(dev)->qp_table;
struct mlx4_bitmap (*bitmap)[MLX4_QP_TABLE_ZONE_NUM] = NULL;
int bitmap_initialized = 0;
u32 last_offset;
int k;
int err;
qp_table->zones = mlx4_zone_allocator_create(MLX4_ZONE_ALLOC_FLAGS_NO_OVERLAP);
if (NULL == qp_table->zones)
return -ENOMEM;
bitmap = kmalloc(sizeof(*bitmap), GFP_KERNEL);
if (NULL == bitmap) {
err = -ENOMEM;
goto free_zone;
}
err = mlx4_bitmap_init(*bitmap + MLX4_QP_TABLE_ZONE_GENERAL, dev->caps.num_qps,
(1 << 23) - 1, reserved_bottom_general,
reserved_top_general);
if (err)
goto free_bitmap;
++bitmap_initialized;
err = mlx4_zone_add_one(qp_table->zones, *bitmap + MLX4_QP_TABLE_ZONE_GENERAL,
MLX4_ZONE_FALLBACK_TO_HIGHER_PRIO |
MLX4_ZONE_USE_RR, 0,
0, qp_table->zones_uids + MLX4_QP_TABLE_ZONE_GENERAL);
if (err)
goto free_bitmap;
err = mlx4_bitmap_init(*bitmap + MLX4_QP_TABLE_ZONE_RSS,
reserved_bottom_rss,
reserved_bottom_rss - 1,
dev->caps.reserved_qps_cnt[MLX4_QP_REGION_FW],
reserved_bottom_rss - start_offset_rss);
if (err)
goto free_bitmap;
++bitmap_initialized;
err = mlx4_zone_add_one(qp_table->zones, *bitmap + MLX4_QP_TABLE_ZONE_RSS,
MLX4_ZONE_ALLOW_ALLOC_FROM_LOWER_PRIO |
MLX4_ZONE_ALLOW_ALLOC_FROM_EQ_PRIO |
MLX4_ZONE_USE_RR, MLX4_QP_TABLE_RSS_ETH_PRIORITY,
0, qp_table->zones_uids + MLX4_QP_TABLE_ZONE_RSS);
if (err)
goto free_bitmap;
last_offset = dev->caps.reserved_qps_cnt[MLX4_QP_REGION_FW];
/* We have a single zone for the A0 steering QPs area of the FW. This area
* needs to be split into subareas. One set of subareas is for RSS QPs
* (in which qp number bits 6 and/or 7 are set); the other set of subareas
* is for RAW_ETH QPs, which require that both bits 6 and 7 are zero.
* Currently, the values returned by the FW (A0 steering area starting qp number
* and A0 steering area size) are such that there are only two subareas -- one
* for RSS and one for RAW_ETH.
*/
for (k = MLX4_QP_TABLE_ZONE_RSS + 1; k < sizeof(*bitmap)/sizeof((*bitmap)[0]);
k++) {
int size;
u32 offset = start_offset_rss;
u32 bf_mask;
u32 requested_size;
/* Assuming MLX4_BF_QP_SKIP_MASK is consecutive ones, this calculates
* a mask of all LSB bits set until (and not including) the first
* set bit of MLX4_BF_QP_SKIP_MASK. For example, if MLX4_BF_QP_SKIP_MASK
* is 0xc0, bf_mask will be 0x3f.
*/
bf_mask = (MLX4_BF_QP_SKIP_MASK & ~(MLX4_BF_QP_SKIP_MASK - 1)) - 1;
requested_size = min((u32)MLX4_QP_TABLE_RAW_ETH_SIZE, bf_mask + 1);
if (((last_offset & MLX4_BF_QP_SKIP_MASK) &&
((int)(max_table_offset - last_offset)) >=
roundup_pow_of_two(MLX4_BF_QP_SKIP_MASK)) ||
(!(last_offset & MLX4_BF_QP_SKIP_MASK) &&
!((last_offset + requested_size - 1) &
MLX4_BF_QP_SKIP_MASK)))
size = requested_size;
else {
u32 candidate_offset =
(last_offset | MLX4_BF_QP_SKIP_MASK | bf_mask) + 1;
if (last_offset & MLX4_BF_QP_SKIP_MASK)
last_offset = candidate_offset;
/* From this point, the BF bits are 0 */
if (last_offset > max_table_offset) {
/* need to skip */
size = -1;
} else {
size = min3(max_table_offset - last_offset,
bf_mask - (last_offset & bf_mask),
requested_size);
if (size < requested_size) {
int candidate_size;
candidate_size = min3(
max_table_offset - candidate_offset,
bf_mask - (last_offset & bf_mask),
requested_size);
/* We will not take this path if last_offset was
* already set above to candidate_offset
*/
if (candidate_size > size) {
last_offset = candidate_offset;
size = candidate_size;
}
}
}
}
if (size > 0) {
/* mlx4_bitmap_alloc_range will find a contiguous range of "size"
* QPs in which both bits 6 and 7 are zero, because we pass it the
* MLX4_BF_SKIP_MASK).
*/
offset = mlx4_bitmap_alloc_range(
*bitmap + MLX4_QP_TABLE_ZONE_RSS,
size, 1,
MLX4_BF_QP_SKIP_MASK);
if (offset == (u32)-1) {
err = -ENOMEM;
break;
}
last_offset = offset + size;
err = mlx4_bitmap_init(*bitmap + k, roundup_pow_of_two(size),
roundup_pow_of_two(size) - 1, 0,
roundup_pow_of_two(size) - size);
} else {
/* Add an empty bitmap, we'll allocate from different zones (since
* at least one is reserved)
*/
err = mlx4_bitmap_init(*bitmap + k, 1,
MLX4_QP_TABLE_RAW_ETH_SIZE - 1, 0,
0);
mlx4_bitmap_alloc_range(*bitmap + k, 1, 1, 0);
}
if (err)
break;
++bitmap_initialized;
err = mlx4_zone_add_one(qp_table->zones, *bitmap + k,
MLX4_ZONE_ALLOW_ALLOC_FROM_LOWER_PRIO |
MLX4_ZONE_ALLOW_ALLOC_FROM_EQ_PRIO |
MLX4_ZONE_USE_RR, MLX4_QP_TABLE_RAW_ETH_PRIORITY,
offset, qp_table->zones_uids + k);
if (err)
break;
}
if (err)
goto free_bitmap;
qp_table->bitmap_gen = *bitmap;
return err;
free_bitmap:
for (k = 0; k < bitmap_initialized; k++)
mlx4_bitmap_cleanup(*bitmap + k);
kfree(bitmap);
free_zone:
mlx4_zone_allocator_destroy(qp_table->zones);
return err;
}
static void mlx4_cleanup_qp_zones(struct mlx4_dev *dev)
{
struct mlx4_qp_table *qp_table = &mlx4_priv(dev)->qp_table;
if (qp_table->zones) {
int i;
for (i = 0;
i < sizeof(qp_table->zones_uids)/sizeof(qp_table->zones_uids[0]);
i++) {
struct mlx4_bitmap *bitmap =
mlx4_zone_get_bitmap(qp_table->zones,
qp_table->zones_uids[i]);
mlx4_zone_remove_one(qp_table->zones, qp_table->zones_uids[i]);
if (NULL == bitmap)
continue;
mlx4_bitmap_cleanup(bitmap);
}
mlx4_zone_allocator_destroy(qp_table->zones);
kfree(qp_table->bitmap_gen);
qp_table->bitmap_gen = NULL;
qp_table->zones = NULL;
}
}
int mlx4_init_qp_table(struct mlx4_dev *dev)
{
struct mlx4_qp_table *qp_table = &mlx4_priv(dev)->qp_table;
int err;
int reserved_from_top = 0;
int reserved_from_bot;
int k;
int fixed_reserved_from_bot_rv = 0;
int bottom_reserved_for_rss_bitmap;
u32 max_table_offset = dev->caps.dmfs_high_rate_qpn_base +
dev->caps.dmfs_high_rate_qpn_range;
spin_lock_init(&qp_table->lock);
INIT_RADIX_TREE(&dev->qp_table_tree, GFP_ATOMIC);
if (mlx4_is_slave(dev))
return 0;
/* We reserve 2 extra QPs per port for the special QPs. The
* block of special QPs must be aligned to a multiple of 8, so
* round up.
*
* We also reserve the MSB of the 24-bit QP number to indicate
* that a QP is an XRC QP.
*/
for (k = 0; k <= MLX4_QP_REGION_BOTTOM; k++)
fixed_reserved_from_bot_rv += dev->caps.reserved_qps_cnt[k];
if (fixed_reserved_from_bot_rv < max_table_offset)
fixed_reserved_from_bot_rv = max_table_offset;
/* We reserve at least 1 extra for bitmaps that we don't have enough space for*/
bottom_reserved_for_rss_bitmap =
roundup_pow_of_two(fixed_reserved_from_bot_rv + 1);
dev->phys_caps.base_sqpn = ALIGN(bottom_reserved_for_rss_bitmap, 8);
{
int sort[MLX4_NUM_QP_REGION];
int i, j;
int last_base = dev->caps.num_qps;
for (i = 1; i < MLX4_NUM_QP_REGION; ++i)
sort[i] = i;
for (i = MLX4_NUM_QP_REGION; i > MLX4_QP_REGION_BOTTOM; --i) {
for (j = MLX4_QP_REGION_BOTTOM + 2; j < i; ++j) {
if (dev->caps.reserved_qps_cnt[sort[j]] >
dev->caps.reserved_qps_cnt[sort[j - 1]])
swap(sort[j], sort[j - 1]);
}
}
for (i = MLX4_QP_REGION_BOTTOM + 1; i < MLX4_NUM_QP_REGION; ++i) {
last_base -= dev->caps.reserved_qps_cnt[sort[i]];
dev->caps.reserved_qps_base[sort[i]] = last_base;
reserved_from_top +=
dev->caps.reserved_qps_cnt[sort[i]];
}
}
/* Reserve 8 real SQPs in both native and SRIOV modes.
* In addition, in SRIOV mode, reserve 8 proxy SQPs per function
* (for all PFs and VFs), and 8 corresponding tunnel QPs.
* Each proxy SQP works opposite its own tunnel QP.
*
* The QPs are arranged as follows:
* a. 8 real SQPs
* b. All the proxy SQPs (8 per function)
* c. All the tunnel QPs (8 per function)
*/
reserved_from_bot = mlx4_num_reserved_sqps(dev);
if (reserved_from_bot + reserved_from_top > dev->caps.num_qps) {
mlx4_err(dev, "Number of reserved QPs is higher than number of QPs\n");
return -EINVAL;
}
err = mlx4_create_zones(dev, reserved_from_bot, reserved_from_bot,
bottom_reserved_for_rss_bitmap,
fixed_reserved_from_bot_rv,
max_table_offset);
if (err)
return err;
if (mlx4_is_mfunc(dev)) {
/* for PPF use */
dev->phys_caps.base_proxy_sqpn = dev->phys_caps.base_sqpn + 8;
dev->phys_caps.base_tunnel_sqpn = dev->phys_caps.base_sqpn + 8 + 8 * MLX4_MFUNC_MAX;
/* In mfunc, calculate proxy and tunnel qp offsets for the PF here,
* since the PF does not call mlx4_slave_caps */
dev->caps.spec_qps = kcalloc(dev->caps.num_ports,
sizeof(*dev->caps.spec_qps),
GFP_KERNEL);
if (!dev->caps.spec_qps) {
err = -ENOMEM;
goto err_mem;
}
for (k = 0; k < dev->caps.num_ports; k++) {
dev->caps.spec_qps[k].qp0_proxy = dev->phys_caps.base_proxy_sqpn +
8 * mlx4_master_func_num(dev) + k;
dev->caps.spec_qps[k].qp0_tunnel = dev->caps.spec_qps[k].qp0_proxy + 8 * MLX4_MFUNC_MAX;
dev->caps.spec_qps[k].qp1_proxy = dev->phys_caps.base_proxy_sqpn +
8 * mlx4_master_func_num(dev) + MLX4_MAX_PORTS + k;
dev->caps.spec_qps[k].qp1_tunnel = dev->caps.spec_qps[k].qp1_proxy + 8 * MLX4_MFUNC_MAX;
}
}
err = mlx4_CONF_SPECIAL_QP(dev, dev->phys_caps.base_sqpn);
if (err)
goto err_mem;
return err;
err_mem:
kfree(dev->caps.spec_qps);
dev->caps.spec_qps = NULL;
mlx4_cleanup_qp_zones(dev);
return err;
}
void mlx4_cleanup_qp_table(struct mlx4_dev *dev)
{
if (mlx4_is_slave(dev))
return;
mlx4_CONF_SPECIAL_QP(dev, 0);
mlx4_cleanup_qp_zones(dev);
}
int mlx4_qp_query(struct mlx4_dev *dev, struct mlx4_qp *qp,
struct mlx4_qp_context *context)
{
struct mlx4_cmd_mailbox *mailbox;
int err;
mailbox = mlx4_alloc_cmd_mailbox(dev);
if (IS_ERR(mailbox))
return PTR_ERR(mailbox);
err = mlx4_cmd_box(dev, 0, mailbox->dma, qp->qpn, 0,
MLX4_CMD_QUERY_QP, MLX4_CMD_TIME_CLASS_A,
MLX4_CMD_WRAPPED);
if (!err)
memcpy(context, mailbox->buf + 8, sizeof(*context));
mlx4_free_cmd_mailbox(dev, mailbox);
return err;
}
EXPORT_SYMBOL_GPL(mlx4_qp_query);
int mlx4_qp_to_ready(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
struct mlx4_qp_context *context,
struct mlx4_qp *qp, enum mlx4_qp_state *qp_state)
{
int err;
int i;
enum mlx4_qp_state states[] = {
MLX4_QP_STATE_RST,
MLX4_QP_STATE_INIT,
MLX4_QP_STATE_RTR,
MLX4_QP_STATE_RTS
};
for (i = 0; i < ARRAY_SIZE(states) - 1; i++) {
context->flags &= cpu_to_be32(~(0xf << 28));
context->flags |= cpu_to_be32(states[i + 1] << 28);
if (states[i + 1] != MLX4_QP_STATE_RTR)
context->params2 &= ~cpu_to_be32(MLX4_QP_BIT_FPP);
err = mlx4_qp_modify(dev, mtt, states[i], states[i + 1],
context, 0, 0, qp);
if (err) {
mlx4_err(dev, "Failed to bring QP to state: %d with error: %d\n",
states[i + 1], err);
return err;
}
*qp_state = states[i + 1];
}
return 0;
}
EXPORT_SYMBOL_GPL(mlx4_qp_to_ready);
u16 mlx4_qp_roce_entropy(struct mlx4_dev *dev, u32 qpn)
{
struct mlx4_qp_context context;
struct mlx4_qp qp;
int err;
qp.qpn = qpn;
err = mlx4_qp_query(dev, &qp, &context);
if (!err) {
u32 dest_qpn = be32_to_cpu(context.remote_qpn) & 0xffffff;
u16 folded_dst = folded_qp(dest_qpn);
u16 folded_src = folded_qp(qpn);
return (dest_qpn != qpn) ?
((folded_dst ^ folded_src) | 0xC000) :
folded_src | 0xC000;
}
return 0xdead;
}
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