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ubuntu-linux-kernel/drivers/infiniband/hw/mlx4/mcg.c

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/*
* Copyright (c) 2012 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 <rdma/ib_mad.h>
#include <rdma/ib_smi.h>
#include <rdma/ib_cache.h>
#include <rdma/ib_sa.h>
#include <linux/mlx4/cmd.h>
#include <linux/rbtree.h>
#include <linux/delay.h>
#include "mlx4_ib.h"
#define MAX_VFS 80
#define MAX_PEND_REQS_PER_FUNC 4
#define MAD_TIMEOUT_MS 2000
#define mcg_warn(fmt, arg...) pr_warn("MCG WARNING: " fmt, ##arg)
#define mcg_error(fmt, arg...) pr_err(fmt, ##arg)
#define mcg_warn_group(group, format, arg...) \
pr_warn("%s-%d: %16s (port %d): WARNING: " format, __func__, __LINE__,\
(group)->name, group->demux->port, ## arg)
#define mcg_debug_group(group, format, arg...) \
pr_debug("%s-%d: %16s (port %d): WARNING: " format, __func__, __LINE__,\
(group)->name, (group)->demux->port, ## arg)
#define mcg_error_group(group, format, arg...) \
pr_err(" %16s: " format, (group)->name, ## arg)
static union ib_gid mgid0;
static struct workqueue_struct *clean_wq;
enum mcast_state {
MCAST_NOT_MEMBER = 0,
MCAST_MEMBER,
};
enum mcast_group_state {
MCAST_IDLE,
MCAST_JOIN_SENT,
MCAST_LEAVE_SENT,
MCAST_RESP_READY
};
struct mcast_member {
enum mcast_state state;
uint8_t join_state;
int num_pend_reqs;
struct list_head pending;
};
struct ib_sa_mcmember_data {
union ib_gid mgid;
union ib_gid port_gid;
__be32 qkey;
__be16 mlid;
u8 mtusel_mtu;
u8 tclass;
__be16 pkey;
u8 ratesel_rate;
u8 lifetmsel_lifetm;
__be32 sl_flowlabel_hoplimit;
u8 scope_join_state;
u8 proxy_join;
u8 reserved[2];
} __packed __aligned(4);
struct mcast_group {
struct ib_sa_mcmember_data rec;
struct rb_node node;
struct list_head mgid0_list;
struct mlx4_ib_demux_ctx *demux;
struct mcast_member func[MAX_VFS];
struct mutex lock;
struct work_struct work;
struct list_head pending_list;
int members[3];
enum mcast_group_state state;
enum mcast_group_state prev_state;
struct ib_sa_mad response_sa_mad;
__be64 last_req_tid;
char name[33]; /* MGID string */
struct device_attribute dentry;
/* refcount is the reference count for the following:
1. Each queued request
2. Each invocation of the worker thread
3. Membership of the port at the SA
*/
atomic_t refcount;
/* delayed work to clean pending SM request */
struct delayed_work timeout_work;
struct list_head cleanup_list;
};
struct mcast_req {
int func;
struct ib_sa_mad sa_mad;
struct list_head group_list;
struct list_head func_list;
struct mcast_group *group;
int clean;
};
#define safe_atomic_dec(ref) \
do {\
if (atomic_dec_and_test(ref)) \
mcg_warn_group(group, "did not expect to reach zero\n"); \
} while (0)
static const char *get_state_string(enum mcast_group_state state)
{
switch (state) {
case MCAST_IDLE:
return "MCAST_IDLE";
case MCAST_JOIN_SENT:
return "MCAST_JOIN_SENT";
case MCAST_LEAVE_SENT:
return "MCAST_LEAVE_SENT";
case MCAST_RESP_READY:
return "MCAST_RESP_READY";
}
return "Invalid State";
}
static struct mcast_group *mcast_find(struct mlx4_ib_demux_ctx *ctx,
union ib_gid *mgid)
{
struct rb_node *node = ctx->mcg_table.rb_node;
struct mcast_group *group;
int ret;
while (node) {
group = rb_entry(node, struct mcast_group, node);
ret = memcmp(mgid->raw, group->rec.mgid.raw, sizeof *mgid);
if (!ret)
return group;
if (ret < 0)
node = node->rb_left;
else
node = node->rb_right;
}
return NULL;
}
static struct mcast_group *mcast_insert(struct mlx4_ib_demux_ctx *ctx,
struct mcast_group *group)
{
struct rb_node **link = &ctx->mcg_table.rb_node;
struct rb_node *parent = NULL;
struct mcast_group *cur_group;
int ret;
while (*link) {
parent = *link;
cur_group = rb_entry(parent, struct mcast_group, node);
ret = memcmp(group->rec.mgid.raw, cur_group->rec.mgid.raw,
sizeof group->rec.mgid);
if (ret < 0)
link = &(*link)->rb_left;
else if (ret > 0)
link = &(*link)->rb_right;
else
return cur_group;
}
rb_link_node(&group->node, parent, link);
rb_insert_color(&group->node, &ctx->mcg_table);
return NULL;
}
static int send_mad_to_wire(struct mlx4_ib_demux_ctx *ctx, struct ib_mad *mad)
{
struct mlx4_ib_dev *dev = ctx->dev;
struct rdma_ah_attr ah_attr;
unsigned long flags;
spin_lock_irqsave(&dev->sm_lock, flags);
if (!dev->sm_ah[ctx->port - 1]) {
/* port is not yet Active, sm_ah not ready */
spin_unlock_irqrestore(&dev->sm_lock, flags);
return -EAGAIN;
}
mlx4_ib_query_ah(dev->sm_ah[ctx->port - 1], &ah_attr);
spin_unlock_irqrestore(&dev->sm_lock, flags);
return mlx4_ib_send_to_wire(dev, mlx4_master_func_num(dev->dev),
ctx->port, IB_QPT_GSI, 0, 1, IB_QP1_QKEY,
&ah_attr, NULL, 0xffff, mad);
}
static int send_mad_to_slave(int slave, struct mlx4_ib_demux_ctx *ctx,
struct ib_mad *mad)
{
struct mlx4_ib_dev *dev = ctx->dev;
struct ib_mad_agent *agent = dev->send_agent[ctx->port - 1][1];
struct ib_wc wc;
struct rdma_ah_attr ah_attr;
/* Our agent might not yet be registered when mads start to arrive */
if (!agent)
return -EAGAIN;
rdma_query_ah(dev->sm_ah[ctx->port - 1], &ah_attr);
if (ib_find_cached_pkey(&dev->ib_dev, ctx->port, IB_DEFAULT_PKEY_FULL, &wc.pkey_index))
return -EINVAL;
wc.sl = 0;
wc.dlid_path_bits = 0;
wc.port_num = ctx->port;
wc.slid = rdma_ah_get_dlid(&ah_attr); /* opensm lid */
wc.src_qp = 1;
return mlx4_ib_send_to_slave(dev, slave, ctx->port, IB_QPT_GSI, &wc, NULL, mad);
}
static int send_join_to_wire(struct mcast_group *group, struct ib_sa_mad *sa_mad)
{
struct ib_sa_mad mad;
struct ib_sa_mcmember_data *sa_mad_data = (struct ib_sa_mcmember_data *)&mad.data;
int ret;
/* we rely on a mad request as arrived from a VF */
memcpy(&mad, sa_mad, sizeof mad);
/* fix port GID to be the real one (slave 0) */
sa_mad_data->port_gid.global.interface_id = group->demux->guid_cache[0];
/* assign our own TID */
mad.mad_hdr.tid = mlx4_ib_get_new_demux_tid(group->demux);
group->last_req_tid = mad.mad_hdr.tid; /* keep it for later validation */
ret = send_mad_to_wire(group->demux, (struct ib_mad *)&mad);
/* set timeout handler */
if (!ret) {
/* calls mlx4_ib_mcg_timeout_handler */
queue_delayed_work(group->demux->mcg_wq, &group->timeout_work,
msecs_to_jiffies(MAD_TIMEOUT_MS));
}
return ret;
}
static int send_leave_to_wire(struct mcast_group *group, u8 join_state)
{
struct ib_sa_mad mad;
struct ib_sa_mcmember_data *sa_data = (struct ib_sa_mcmember_data *)&mad.data;
int ret;
memset(&mad, 0, sizeof mad);
mad.mad_hdr.base_version = 1;
mad.mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
mad.mad_hdr.class_version = 2;
mad.mad_hdr.method = IB_SA_METHOD_DELETE;
mad.mad_hdr.status = cpu_to_be16(0);
mad.mad_hdr.class_specific = cpu_to_be16(0);
mad.mad_hdr.tid = mlx4_ib_get_new_demux_tid(group->demux);
group->last_req_tid = mad.mad_hdr.tid; /* keep it for later validation */
mad.mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
mad.mad_hdr.attr_mod = cpu_to_be32(0);
mad.sa_hdr.sm_key = 0x0;
mad.sa_hdr.attr_offset = cpu_to_be16(7);
mad.sa_hdr.comp_mask = IB_SA_MCMEMBER_REC_MGID |
IB_SA_MCMEMBER_REC_PORT_GID | IB_SA_MCMEMBER_REC_JOIN_STATE;
*sa_data = group->rec;
sa_data->scope_join_state = join_state;
ret = send_mad_to_wire(group->demux, (struct ib_mad *)&mad);
if (ret)
group->state = MCAST_IDLE;
/* set timeout handler */
if (!ret) {
/* calls mlx4_ib_mcg_timeout_handler */
queue_delayed_work(group->demux->mcg_wq, &group->timeout_work,
msecs_to_jiffies(MAD_TIMEOUT_MS));
}
return ret;
}
static int send_reply_to_slave(int slave, struct mcast_group *group,
struct ib_sa_mad *req_sa_mad, u16 status)
{
struct ib_sa_mad mad;
struct ib_sa_mcmember_data *sa_data = (struct ib_sa_mcmember_data *)&mad.data;
struct ib_sa_mcmember_data *req_sa_data = (struct ib_sa_mcmember_data *)&req_sa_mad->data;
int ret;
memset(&mad, 0, sizeof mad);
mad.mad_hdr.base_version = 1;
mad.mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
mad.mad_hdr.class_version = 2;
mad.mad_hdr.method = IB_MGMT_METHOD_GET_RESP;
mad.mad_hdr.status = cpu_to_be16(status);
mad.mad_hdr.class_specific = cpu_to_be16(0);
mad.mad_hdr.tid = req_sa_mad->mad_hdr.tid;
*(u8 *)&mad.mad_hdr.tid = 0; /* resetting tid to 0 */
mad.mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
mad.mad_hdr.attr_mod = cpu_to_be32(0);
mad.sa_hdr.sm_key = req_sa_mad->sa_hdr.sm_key;
mad.sa_hdr.attr_offset = cpu_to_be16(7);
mad.sa_hdr.comp_mask = 0; /* ignored on responses, see IBTA spec */
*sa_data = group->rec;
/* reconstruct VF's requested join_state and port_gid */
sa_data->scope_join_state &= 0xf0;
sa_data->scope_join_state |= (group->func[slave].join_state & 0x0f);
memcpy(&sa_data->port_gid, &req_sa_data->port_gid, sizeof req_sa_data->port_gid);
ret = send_mad_to_slave(slave, group->demux, (struct ib_mad *)&mad);
return ret;
}
static int check_selector(ib_sa_comp_mask comp_mask,
ib_sa_comp_mask selector_mask,
ib_sa_comp_mask value_mask,
u8 src_value, u8 dst_value)
{
int err;
u8 selector = dst_value >> 6;
dst_value &= 0x3f;
src_value &= 0x3f;
if (!(comp_mask & selector_mask) || !(comp_mask & value_mask))
return 0;
switch (selector) {
case IB_SA_GT:
err = (src_value <= dst_value);
break;
case IB_SA_LT:
err = (src_value >= dst_value);
break;
case IB_SA_EQ:
err = (src_value != dst_value);
break;
default:
err = 0;
break;
}
return err;
}
static u16 cmp_rec(struct ib_sa_mcmember_data *src,
struct ib_sa_mcmember_data *dst, ib_sa_comp_mask comp_mask)
{
/* src is group record, dst is request record */
/* MGID must already match */
/* Port_GID we always replace to our Port_GID, so it is a match */
#define MAD_STATUS_REQ_INVALID 0x0200
if (comp_mask & IB_SA_MCMEMBER_REC_QKEY && src->qkey != dst->qkey)
return MAD_STATUS_REQ_INVALID;
if (comp_mask & IB_SA_MCMEMBER_REC_MLID && src->mlid != dst->mlid)
return MAD_STATUS_REQ_INVALID;
if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_MTU_SELECTOR,
IB_SA_MCMEMBER_REC_MTU,
src->mtusel_mtu, dst->mtusel_mtu))
return MAD_STATUS_REQ_INVALID;
if (comp_mask & IB_SA_MCMEMBER_REC_TRAFFIC_CLASS &&
src->tclass != dst->tclass)
return MAD_STATUS_REQ_INVALID;
if (comp_mask & IB_SA_MCMEMBER_REC_PKEY && src->pkey != dst->pkey)
return MAD_STATUS_REQ_INVALID;
if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_RATE_SELECTOR,
IB_SA_MCMEMBER_REC_RATE,
src->ratesel_rate, dst->ratesel_rate))
return MAD_STATUS_REQ_INVALID;
if (check_selector(comp_mask,
IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME_SELECTOR,
IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME,
src->lifetmsel_lifetm, dst->lifetmsel_lifetm))
return MAD_STATUS_REQ_INVALID;
if (comp_mask & IB_SA_MCMEMBER_REC_SL &&
(be32_to_cpu(src->sl_flowlabel_hoplimit) & 0xf0000000) !=
(be32_to_cpu(dst->sl_flowlabel_hoplimit) & 0xf0000000))
return MAD_STATUS_REQ_INVALID;
if (comp_mask & IB_SA_MCMEMBER_REC_FLOW_LABEL &&
(be32_to_cpu(src->sl_flowlabel_hoplimit) & 0x0fffff00) !=
(be32_to_cpu(dst->sl_flowlabel_hoplimit) & 0x0fffff00))
return MAD_STATUS_REQ_INVALID;
if (comp_mask & IB_SA_MCMEMBER_REC_HOP_LIMIT &&
(be32_to_cpu(src->sl_flowlabel_hoplimit) & 0x000000ff) !=
(be32_to_cpu(dst->sl_flowlabel_hoplimit) & 0x000000ff))
return MAD_STATUS_REQ_INVALID;
if (comp_mask & IB_SA_MCMEMBER_REC_SCOPE &&
(src->scope_join_state & 0xf0) !=
(dst->scope_join_state & 0xf0))
return MAD_STATUS_REQ_INVALID;
/* join_state checked separately, proxy_join ignored */
return 0;
}
/* release group, return 1 if this was last release and group is destroyed
* timout work is canceled sync */
static int release_group(struct mcast_group *group, int from_timeout_handler)
{
struct mlx4_ib_demux_ctx *ctx = group->demux;
int nzgroup;
mutex_lock(&ctx->mcg_table_lock);
mutex_lock(&group->lock);
if (atomic_dec_and_test(&group->refcount)) {
if (!from_timeout_handler) {
if (group->state != MCAST_IDLE &&
!cancel_delayed_work(&group->timeout_work)) {
atomic_inc(&group->refcount);
mutex_unlock(&group->lock);
mutex_unlock(&ctx->mcg_table_lock);
return 0;
}
}
nzgroup = memcmp(&group->rec.mgid, &mgid0, sizeof mgid0);
if (nzgroup)
del_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr);
if (!list_empty(&group->pending_list))
mcg_warn_group(group, "releasing a group with non empty pending list\n");
if (nzgroup)
rb_erase(&group->node, &ctx->mcg_table);
list_del_init(&group->mgid0_list);
mutex_unlock(&group->lock);
mutex_unlock(&ctx->mcg_table_lock);
kfree(group);
return 1;
} else {
mutex_unlock(&group->lock);
mutex_unlock(&ctx->mcg_table_lock);
}
return 0;
}
static void adjust_membership(struct mcast_group *group, u8 join_state, int inc)
{
int i;
for (i = 0; i < 3; i++, join_state >>= 1)
if (join_state & 0x1)
group->members[i] += inc;
}
static u8 get_leave_state(struct mcast_group *group)
{
u8 leave_state = 0;
int i;
for (i = 0; i < 3; i++)
if (!group->members[i])
leave_state |= (1 << i);
return leave_state & (group->rec.scope_join_state & 0xf);
}
static int join_group(struct mcast_group *group, int slave, u8 join_mask)
{
int ret = 0;
u8 join_state;
/* remove bits that slave is already member of, and adjust */
join_state = join_mask & (~group->func[slave].join_state);
adjust_membership(group, join_state, 1);
group->func[slave].join_state |= join_state;
if (group->func[slave].state != MCAST_MEMBER && join_state) {
group->func[slave].state = MCAST_MEMBER;
ret = 1;
}
return ret;
}
static int leave_group(struct mcast_group *group, int slave, u8 leave_state)
{
int ret = 0;
adjust_membership(group, leave_state, -1);
group->func[slave].join_state &= ~leave_state;
if (!group->func[slave].join_state) {
group->func[slave].state = MCAST_NOT_MEMBER;
ret = 1;
}
return ret;
}
static int check_leave(struct mcast_group *group, int slave, u8 leave_mask)
{
if (group->func[slave].state != MCAST_MEMBER)
return MAD_STATUS_REQ_INVALID;
/* make sure we're not deleting unset bits */
if (~group->func[slave].join_state & leave_mask)
return MAD_STATUS_REQ_INVALID;
if (!leave_mask)
return MAD_STATUS_REQ_INVALID;
return 0;
}
static void mlx4_ib_mcg_timeout_handler(struct work_struct *work)
{
struct delayed_work *delay = to_delayed_work(work);
struct mcast_group *group;
struct mcast_req *req = NULL;
group = container_of(delay, typeof(*group), timeout_work);
mutex_lock(&group->lock);
if (group->state == MCAST_JOIN_SENT) {
if (!list_empty(&group->pending_list)) {
req = list_first_entry(&group->pending_list, struct mcast_req, group_list);
list_del(&req->group_list);
list_del(&req->func_list);
--group->func[req->func].num_pend_reqs;
mutex_unlock(&group->lock);
kfree(req);
if (memcmp(&group->rec.mgid, &mgid0, sizeof mgid0)) {
if (release_group(group, 1))
return;
} else {
kfree(group);
return;
}
mutex_lock(&group->lock);
} else
mcg_warn_group(group, "DRIVER BUG\n");
} else if (group->state == MCAST_LEAVE_SENT) {
if (group->rec.scope_join_state & 0xf)
group->rec.scope_join_state &= 0xf0;
group->state = MCAST_IDLE;
mutex_unlock(&group->lock);
if (release_group(group, 1))
return;
mutex_lock(&group->lock);
} else
mcg_warn_group(group, "invalid state %s\n", get_state_string(group->state));
group->state = MCAST_IDLE;
atomic_inc(&group->refcount);
if (!queue_work(group->demux->mcg_wq, &group->work))
safe_atomic_dec(&group->refcount);
mutex_unlock(&group->lock);
}
static int handle_leave_req(struct mcast_group *group, u8 leave_mask,
struct mcast_req *req)
{
u16 status;
if (req->clean)
leave_mask = group->func[req->func].join_state;
status = check_leave(group, req->func, leave_mask);
if (!status)
leave_group(group, req->func, leave_mask);
if (!req->clean)
send_reply_to_slave(req->func, group, &req->sa_mad, status);
--group->func[req->func].num_pend_reqs;
list_del(&req->group_list);
list_del(&req->func_list);
kfree(req);
return 1;
}
static int handle_join_req(struct mcast_group *group, u8 join_mask,
struct mcast_req *req)
{
u8 group_join_state = group->rec.scope_join_state & 0xf;
int ref = 0;
u16 status;
struct ib_sa_mcmember_data *sa_data = (struct ib_sa_mcmember_data *)req->sa_mad.data;
if (join_mask == (group_join_state & join_mask)) {
/* port's membership need not change */
status = cmp_rec(&group->rec, sa_data, req->sa_mad.sa_hdr.comp_mask);
if (!status)
join_group(group, req->func, join_mask);
--group->func[req->func].num_pend_reqs;
send_reply_to_slave(req->func, group, &req->sa_mad, status);
list_del(&req->group_list);
list_del(&req->func_list);
kfree(req);
++ref;
} else {
/* port's membership needs to be updated */
group->prev_state = group->state;
if (send_join_to_wire(group, &req->sa_mad)) {
--group->func[req->func].num_pend_reqs;
list_del(&req->group_list);
list_del(&req->func_list);
kfree(req);
ref = 1;
group->state = group->prev_state;
} else
group->state = MCAST_JOIN_SENT;
}
return ref;
}
static void mlx4_ib_mcg_work_handler(struct work_struct *work)
{
struct mcast_group *group;
struct mcast_req *req = NULL;
struct ib_sa_mcmember_data *sa_data;
u8 req_join_state;
int rc = 1; /* release_count - this is for the scheduled work */
u16 status;
u8 method;
group = container_of(work, typeof(*group), work);
mutex_lock(&group->lock);
/* First, let's see if a response from SM is waiting regarding this group.
* If so, we need to update the group's REC. If this is a bad response, we
* may need to send a bad response to a VF waiting for it. If VF is waiting
* and this is a good response, the VF will be answered later in this func. */
if (group->state == MCAST_RESP_READY) {
/* cancels mlx4_ib_mcg_timeout_handler */
cancel_delayed_work(&group->timeout_work);
status = be16_to_cpu(group->response_sa_mad.mad_hdr.status);
method = group->response_sa_mad.mad_hdr.method;
if (group->last_req_tid != group->response_sa_mad.mad_hdr.tid) {
mcg_warn_group(group, "Got MAD response to existing MGID but wrong TID, dropping. Resp TID=%llx, group TID=%llx\n",
be64_to_cpu(group->response_sa_mad.mad_hdr.tid),
be64_to_cpu(group->last_req_tid));
group->state = group->prev_state;
goto process_requests;
}
if (status) {
if (!list_empty(&group->pending_list))
req = list_first_entry(&group->pending_list,
struct mcast_req, group_list);
if ((method == IB_MGMT_METHOD_GET_RESP)) {
if (req) {
send_reply_to_slave(req->func, group, &req->sa_mad, status);
--group->func[req->func].num_pend_reqs;
list_del(&req->group_list);
list_del(&req->func_list);
kfree(req);
++rc;
} else
mcg_warn_group(group, "no request for failed join\n");
} else if (method == IB_SA_METHOD_DELETE_RESP && group->demux->flushing)
++rc;
} else {
u8 resp_join_state;
u8 cur_join_state;
resp_join_state = ((struct ib_sa_mcmember_data *)
group->response_sa_mad.data)->scope_join_state & 0xf;
cur_join_state = group->rec.scope_join_state & 0xf;
if (method == IB_MGMT_METHOD_GET_RESP) {
/* successfull join */
if (!cur_join_state && resp_join_state)
--rc;
} else if (!resp_join_state)
++rc;
memcpy(&group->rec, group->response_sa_mad.data, sizeof group->rec);
}
group->state = MCAST_IDLE;
}
process_requests:
/* We should now go over pending join/leave requests, as long as we are idle. */
while (!list_empty(&group->pending_list) && group->state == MCAST_IDLE) {
req = list_first_entry(&group->pending_list, struct mcast_req,
group_list);
sa_data = (struct ib_sa_mcmember_data *)req->sa_mad.data;
req_join_state = sa_data->scope_join_state & 0xf;
/* For a leave request, we will immediately answer the VF, and
* update our internal counters. The actual leave will be sent
* to SM later, if at all needed. We dequeue the request now. */
if (req->sa_mad.mad_hdr.method == IB_SA_METHOD_DELETE)
rc += handle_leave_req(group, req_join_state, req);
else
rc += handle_join_req(group, req_join_state, req);
}
/* Handle leaves */
if (group->state == MCAST_IDLE) {
req_join_state = get_leave_state(group);
if (req_join_state) {
group->rec.scope_join_state &= ~req_join_state;
group->prev_state = group->state;
if (send_leave_to_wire(group, req_join_state)) {
group->state = group->prev_state;
++rc;
} else
group->state = MCAST_LEAVE_SENT;
}
}
if (!list_empty(&group->pending_list) && group->state == MCAST_IDLE)
goto process_requests;
mutex_unlock(&group->lock);
while (rc--)
release_group(group, 0);
}
static struct mcast_group *search_relocate_mgid0_group(struct mlx4_ib_demux_ctx *ctx,
__be64 tid,
union ib_gid *new_mgid)
{
struct mcast_group *group = NULL, *cur_group, *n;
struct mcast_req *req;
mutex_lock(&ctx->mcg_table_lock);
list_for_each_entry_safe(group, n, &ctx->mcg_mgid0_list, mgid0_list) {
mutex_lock(&group->lock);
if (group->last_req_tid == tid) {
if (memcmp(new_mgid, &mgid0, sizeof mgid0)) {
group->rec.mgid = *new_mgid;
sprintf(group->name, "%016llx%016llx",
be64_to_cpu(group->rec.mgid.global.subnet_prefix),
be64_to_cpu(group->rec.mgid.global.interface_id));
list_del_init(&group->mgid0_list);
cur_group = mcast_insert(ctx, group);
if (cur_group) {
/* A race between our code and SM. Silently cleaning the new one */
req = list_first_entry(&group->pending_list,
struct mcast_req, group_list);
--group->func[req->func].num_pend_reqs;
list_del(&req->group_list);
list_del(&req->func_list);
kfree(req);
mutex_unlock(&group->lock);
mutex_unlock(&ctx->mcg_table_lock);
release_group(group, 0);
return NULL;
}
atomic_inc(&group->refcount);
add_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr);
mutex_unlock(&group->lock);
mutex_unlock(&ctx->mcg_table_lock);
return group;
} else {
struct mcast_req *tmp1, *tmp2;
list_del(&group->mgid0_list);
if (!list_empty(&group->pending_list) && group->state != MCAST_IDLE)
cancel_delayed_work_sync(&group->timeout_work);
list_for_each_entry_safe(tmp1, tmp2, &group->pending_list, group_list) {
list_del(&tmp1->group_list);
kfree(tmp1);
}
mutex_unlock(&group->lock);
mutex_unlock(&ctx->mcg_table_lock);
kfree(group);
return NULL;
}
}
mutex_unlock(&group->lock);
}
mutex_unlock(&ctx->mcg_table_lock);
return NULL;
}
static ssize_t sysfs_show_group(struct device *dev,
struct device_attribute *attr, char *buf);
static struct mcast_group *acquire_group(struct mlx4_ib_demux_ctx *ctx,
union ib_gid *mgid, int create)
{
struct mcast_group *group, *cur_group;
int is_mgid0;
int i;
is_mgid0 = !memcmp(&mgid0, mgid, sizeof mgid0);
if (!is_mgid0) {
group = mcast_find(ctx, mgid);
if (group)
goto found;
}
if (!create)
return ERR_PTR(-ENOENT);
group = kzalloc(sizeof(*group), GFP_KERNEL);
if (!group)
return ERR_PTR(-ENOMEM);
group->demux = ctx;
group->rec.mgid = *mgid;
INIT_LIST_HEAD(&group->pending_list);
INIT_LIST_HEAD(&group->mgid0_list);
for (i = 0; i < MAX_VFS; ++i)
INIT_LIST_HEAD(&group->func[i].pending);
INIT_WORK(&group->work, mlx4_ib_mcg_work_handler);
INIT_DELAYED_WORK(&group->timeout_work, mlx4_ib_mcg_timeout_handler);
mutex_init(&group->lock);
sprintf(group->name, "%016llx%016llx",
be64_to_cpu(group->rec.mgid.global.subnet_prefix),
be64_to_cpu(group->rec.mgid.global.interface_id));
sysfs_attr_init(&group->dentry.attr);
group->dentry.show = sysfs_show_group;
group->dentry.store = NULL;
group->dentry.attr.name = group->name;
group->dentry.attr.mode = 0400;
group->state = MCAST_IDLE;
if (is_mgid0) {
list_add(&group->mgid0_list, &ctx->mcg_mgid0_list);
goto found;
}
cur_group = mcast_insert(ctx, group);
if (cur_group) {
mcg_warn("group just showed up %s - confused\n", cur_group->name);
kfree(group);
return ERR_PTR(-EINVAL);
}
add_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr);
found:
atomic_inc(&group->refcount);
return group;
}
static void queue_req(struct mcast_req *req)
{
struct mcast_group *group = req->group;
atomic_inc(&group->refcount); /* for the request */
atomic_inc(&group->refcount); /* for scheduling the work */
list_add_tail(&req->group_list, &group->pending_list);
list_add_tail(&req->func_list, &group->func[req->func].pending);
/* calls mlx4_ib_mcg_work_handler */
if (!queue_work(group->demux->mcg_wq, &group->work))
safe_atomic_dec(&group->refcount);
}
int mlx4_ib_mcg_demux_handler(struct ib_device *ibdev, int port, int slave,
struct ib_sa_mad *mad)
{
struct mlx4_ib_dev *dev = to_mdev(ibdev);
struct ib_sa_mcmember_data *rec = (struct ib_sa_mcmember_data *)mad->data;
struct mlx4_ib_demux_ctx *ctx = &dev->sriov.demux[port - 1];
struct mcast_group *group;
switch (mad->mad_hdr.method) {
case IB_MGMT_METHOD_GET_RESP:
case IB_SA_METHOD_DELETE_RESP:
mutex_lock(&ctx->mcg_table_lock);
group = acquire_group(ctx, &rec->mgid, 0);
mutex_unlock(&ctx->mcg_table_lock);
if (IS_ERR(group)) {
if (mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP) {
__be64 tid = mad->mad_hdr.tid;
*(u8 *)(&tid) = (u8)slave; /* in group we kept the modified TID */
group = search_relocate_mgid0_group(ctx, tid, &rec->mgid);
} else
group = NULL;
}
if (!group)
return 1;
mutex_lock(&group->lock);
group->response_sa_mad = *mad;
group->prev_state = group->state;
group->state = MCAST_RESP_READY;
/* calls mlx4_ib_mcg_work_handler */
atomic_inc(&group->refcount);
if (!queue_work(ctx->mcg_wq, &group->work))
safe_atomic_dec(&group->refcount);
mutex_unlock(&group->lock);
release_group(group, 0);
return 1; /* consumed */
case IB_MGMT_METHOD_SET:
case IB_SA_METHOD_GET_TABLE:
case IB_SA_METHOD_GET_TABLE_RESP:
case IB_SA_METHOD_DELETE:
return 0; /* not consumed, pass-through to guest over tunnel */
default:
mcg_warn("In demux, port %d: unexpected MCMember method: 0x%x, dropping\n",
port, mad->mad_hdr.method);
return 1; /* consumed */
}
}
int mlx4_ib_mcg_multiplex_handler(struct ib_device *ibdev, int port,
int slave, struct ib_sa_mad *sa_mad)
{
struct mlx4_ib_dev *dev = to_mdev(ibdev);
struct ib_sa_mcmember_data *rec = (struct ib_sa_mcmember_data *)sa_mad->data;
struct mlx4_ib_demux_ctx *ctx = &dev->sriov.demux[port - 1];
struct mcast_group *group;
struct mcast_req *req;
int may_create = 0;
if (ctx->flushing)
return -EAGAIN;
switch (sa_mad->mad_hdr.method) {
case IB_MGMT_METHOD_SET:
may_create = 1;
/* fall through */
case IB_SA_METHOD_DELETE:
req = kzalloc(sizeof *req, GFP_KERNEL);
if (!req)
return -ENOMEM;
req->func = slave;
req->sa_mad = *sa_mad;
mutex_lock(&ctx->mcg_table_lock);
group = acquire_group(ctx, &rec->mgid, may_create);
mutex_unlock(&ctx->mcg_table_lock);
if (IS_ERR(group)) {
kfree(req);
return PTR_ERR(group);
}
mutex_lock(&group->lock);
if (group->func[slave].num_pend_reqs > MAX_PEND_REQS_PER_FUNC) {
mutex_unlock(&group->lock);
mcg_debug_group(group, "Port %d, Func %d has too many pending requests (%d), dropping\n",
port, slave, MAX_PEND_REQS_PER_FUNC);
release_group(group, 0);
kfree(req);
return -ENOMEM;
}
++group->func[slave].num_pend_reqs;
req->group = group;
queue_req(req);
mutex_unlock(&group->lock);
release_group(group, 0);
return 1; /* consumed */
case IB_SA_METHOD_GET_TABLE:
case IB_MGMT_METHOD_GET_RESP:
case IB_SA_METHOD_GET_TABLE_RESP:
case IB_SA_METHOD_DELETE_RESP:
return 0; /* not consumed, pass-through */
default:
mcg_warn("In multiplex, port %d, func %d: unexpected MCMember method: 0x%x, dropping\n",
port, slave, sa_mad->mad_hdr.method);
return 1; /* consumed */
}
}
static ssize_t sysfs_show_group(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct mcast_group *group =
container_of(attr, struct mcast_group, dentry);
struct mcast_req *req = NULL;
char pending_str[40];
char state_str[40];
ssize_t len = 0;
int f;
if (group->state == MCAST_IDLE)
sprintf(state_str, "%s", get_state_string(group->state));
else
sprintf(state_str, "%s(TID=0x%llx)",
get_state_string(group->state),
be64_to_cpu(group->last_req_tid));
if (list_empty(&group->pending_list)) {
sprintf(pending_str, "No");
} else {
req = list_first_entry(&group->pending_list, struct mcast_req, group_list);
sprintf(pending_str, "Yes(TID=0x%llx)",
be64_to_cpu(req->sa_mad.mad_hdr.tid));
}
len += sprintf(buf + len, "%1d [%02d,%02d,%02d] %4d %4s %5s ",
group->rec.scope_join_state & 0xf,
group->members[2], group->members[1], group->members[0],
atomic_read(&group->refcount),
pending_str,
state_str);
for (f = 0; f < MAX_VFS; ++f)
if (group->func[f].state == MCAST_MEMBER)
len += sprintf(buf + len, "%d[%1x] ",
f, group->func[f].join_state);
len += sprintf(buf + len, "\t\t(%4hx %4x %2x %2x %2x %2x %2x "
"%4x %4x %2x %2x)\n",
be16_to_cpu(group->rec.pkey),
be32_to_cpu(group->rec.qkey),
(group->rec.mtusel_mtu & 0xc0) >> 6,
group->rec.mtusel_mtu & 0x3f,
group->rec.tclass,
(group->rec.ratesel_rate & 0xc0) >> 6,
group->rec.ratesel_rate & 0x3f,
(be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0xf0000000) >> 28,
(be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0x0fffff00) >> 8,
be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0x000000ff,
group->rec.proxy_join);
return len;
}
int mlx4_ib_mcg_port_init(struct mlx4_ib_demux_ctx *ctx)
{
char name[20];
atomic_set(&ctx->tid, 0);
sprintf(name, "mlx4_ib_mcg%d", ctx->port);
ctx->mcg_wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
if (!ctx->mcg_wq)
return -ENOMEM;
mutex_init(&ctx->mcg_table_lock);
ctx->mcg_table = RB_ROOT;
INIT_LIST_HEAD(&ctx->mcg_mgid0_list);
ctx->flushing = 0;
return 0;
}
static void force_clean_group(struct mcast_group *group)
{
struct mcast_req *req, *tmp
;
list_for_each_entry_safe(req, tmp, &group->pending_list, group_list) {
list_del(&req->group_list);
kfree(req);
}
del_sysfs_port_mcg_attr(group->demux->dev, group->demux->port, &group->dentry.attr);
rb_erase(&group->node, &group->demux->mcg_table);
kfree(group);
}
static void _mlx4_ib_mcg_port_cleanup(struct mlx4_ib_demux_ctx *ctx, int destroy_wq)
{
int i;
struct rb_node *p;
struct mcast_group *group;
unsigned long end;
int count;
for (i = 0; i < MAX_VFS; ++i)
clean_vf_mcast(ctx, i);
end = jiffies + msecs_to_jiffies(MAD_TIMEOUT_MS + 3000);
do {
count = 0;
mutex_lock(&ctx->mcg_table_lock);
for (p = rb_first(&ctx->mcg_table); p; p = rb_next(p))
++count;
mutex_unlock(&ctx->mcg_table_lock);
if (!count)
break;
usleep_range(1000, 2000);
} while (time_after(end, jiffies));
flush_workqueue(ctx->mcg_wq);
if (destroy_wq)
destroy_workqueue(ctx->mcg_wq);
mutex_lock(&ctx->mcg_table_lock);
while ((p = rb_first(&ctx->mcg_table)) != NULL) {
group = rb_entry(p, struct mcast_group, node);
if (atomic_read(&group->refcount))
mcg_debug_group(group, "group refcount %d!!! (pointer %p)\n",
atomic_read(&group->refcount), group);
force_clean_group(group);
}
mutex_unlock(&ctx->mcg_table_lock);
}
struct clean_work {
struct work_struct work;
struct mlx4_ib_demux_ctx *ctx;
int destroy_wq;
};
static void mcg_clean_task(struct work_struct *work)
{
struct clean_work *cw = container_of(work, struct clean_work, work);
_mlx4_ib_mcg_port_cleanup(cw->ctx, cw->destroy_wq);
cw->ctx->flushing = 0;
kfree(cw);
}
void mlx4_ib_mcg_port_cleanup(struct mlx4_ib_demux_ctx *ctx, int destroy_wq)
{
struct clean_work *work;
if (ctx->flushing)
return;
ctx->flushing = 1;
if (destroy_wq) {
_mlx4_ib_mcg_port_cleanup(ctx, destroy_wq);
ctx->flushing = 0;
return;
}
work = kmalloc(sizeof *work, GFP_KERNEL);
if (!work) {
ctx->flushing = 0;
return;
}
work->ctx = ctx;
work->destroy_wq = destroy_wq;
INIT_WORK(&work->work, mcg_clean_task);
queue_work(clean_wq, &work->work);
}
static void build_leave_mad(struct mcast_req *req)
{
struct ib_sa_mad *mad = &req->sa_mad;
mad->mad_hdr.method = IB_SA_METHOD_DELETE;
}
static void clear_pending_reqs(struct mcast_group *group, int vf)
{
struct mcast_req *req, *tmp, *group_first = NULL;
int clear;
int pend = 0;
if (!list_empty(&group->pending_list))
group_first = list_first_entry(&group->pending_list, struct mcast_req, group_list);
list_for_each_entry_safe(req, tmp, &group->func[vf].pending, func_list) {
clear = 1;
if (group_first == req &&
(group->state == MCAST_JOIN_SENT ||
group->state == MCAST_LEAVE_SENT)) {
clear = cancel_delayed_work(&group->timeout_work);
pend = !clear;
group->state = MCAST_IDLE;
}
if (clear) {
--group->func[vf].num_pend_reqs;
list_del(&req->group_list);
list_del(&req->func_list);
kfree(req);
atomic_dec(&group->refcount);
}
}
if (!pend && (!list_empty(&group->func[vf].pending) || group->func[vf].num_pend_reqs)) {
mcg_warn_group(group, "DRIVER BUG: list_empty %d, num_pend_reqs %d\n",
list_empty(&group->func[vf].pending), group->func[vf].num_pend_reqs);
}
}
static int push_deleteing_req(struct mcast_group *group, int slave)
{
struct mcast_req *req;
struct mcast_req *pend_req;
if (!group->func[slave].join_state)
return 0;
req = kzalloc(sizeof *req, GFP_KERNEL);
if (!req)
return -ENOMEM;
if (!list_empty(&group->func[slave].pending)) {
pend_req = list_entry(group->func[slave].pending.prev, struct mcast_req, group_list);
if (pend_req->clean) {
kfree(req);
return 0;
}
}
req->clean = 1;
req->func = slave;
req->group = group;
++group->func[slave].num_pend_reqs;
build_leave_mad(req);
queue_req(req);
return 0;
}
void clean_vf_mcast(struct mlx4_ib_demux_ctx *ctx, int slave)
{
struct mcast_group *group;
struct rb_node *p;
mutex_lock(&ctx->mcg_table_lock);
for (p = rb_first(&ctx->mcg_table); p; p = rb_next(p)) {
group = rb_entry(p, struct mcast_group, node);
mutex_lock(&group->lock);
if (atomic_read(&group->refcount)) {
/* clear pending requests of this VF */
clear_pending_reqs(group, slave);
push_deleteing_req(group, slave);
}
mutex_unlock(&group->lock);
}
mutex_unlock(&ctx->mcg_table_lock);
}
int mlx4_ib_mcg_init(void)
{
clean_wq = alloc_ordered_workqueue("mlx4_ib_mcg", WQ_MEM_RECLAIM);
if (!clean_wq)
return -ENOMEM;
return 0;
}
void mlx4_ib_mcg_destroy(void)
{
destroy_workqueue(clean_wq);
}
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