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IB/mad: use CQ abstraction 

Remove the local workqueue to process mad completions and use the CQ API
instead.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hal Rosenstock <hal@mellanox.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Christoph Hellwig 2016-01-05 22:46:12 -08:00 committed by Doug Ledford
parent ca281265c0
commit d53e11fdf0
2 changed files with 59 additions and 105 deletions
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162
drivers/infiniband/core/mad.c
View File

@ -61,18 +61,6 @@ MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests
module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
/*
* Define a limit on the number of completions which will be processed by the
* worker thread in a single work item. This ensures that other work items
* (potentially from other users) are processed fairly.
*
* The number of completions was derived from the default queue sizes above.
* We use a value which is double the larger of the 2 queues (receive @ 512)
* but keep it fixed such that an increase in that value does not introduce
* unfairness.
*/
#define MAD_COMPLETION_PROC_LIMIT 1024
static struct list_head ib_mad_port_list;
static u32 ib_mad_client_id = 0;
@ -96,6 +84,9 @@ static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
u8 mgmt_class);
static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
struct ib_mad_agent_private *agent_priv);
static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
struct ib_wc *wc);
static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc);
/*
* Returns a ib_mad_port_private structure or NULL for a device/port
@ -701,12 +692,11 @@ static void snoop_recv(struct ib_mad_qp_info *qp_info,
spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
}
static void build_smp_wc(struct ib_qp *qp,
u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
struct ib_wc *wc)
static void build_smp_wc(struct ib_qp *qp, struct ib_cqe *cqe, u16 slid,
u16 pkey_index, u8 port_num, struct ib_wc *wc)
{
memset(wc, 0, sizeof *wc);
wc->wr_id = wr_id;
wc->wr_cqe = cqe;
wc->status = IB_WC_SUCCESS;
wc->opcode = IB_WC_RECV;
wc->pkey_index = pkey_index;
@ -844,7 +834,7 @@ static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
}
build_smp_wc(mad_agent_priv->agent.qp,
send_wr->wr.wr_id, drslid,
send_wr->wr.wr_cqe, drslid,
send_wr->pkey_index,
send_wr->port_num, &mad_wc);
@ -1051,7 +1041,9 @@ struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
mad_send_wr->sg_list[1].lkey = mad_agent->qp->pd->local_dma_lkey;
mad_send_wr->send_wr.wr.wr_id = (unsigned long) mad_send_wr;
mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
mad_send_wr->send_wr.wr.sg_list = mad_send_wr->sg_list;
mad_send_wr->send_wr.wr.num_sge = 2;
mad_send_wr->send_wr.wr.opcode = IB_WR_SEND;
@ -1163,8 +1155,9 @@ int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
/* Set WR ID to find mad_send_wr upon completion */
qp_info = mad_send_wr->mad_agent_priv->qp_info;
mad_send_wr->send_wr.wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
mad_agent = mad_send_wr->send_buf.mad_agent;
sge = mad_send_wr->sg_list;
@ -2185,13 +2178,14 @@ handle_smi(struct ib_mad_port_private *port_priv,
return handle_ib_smi(port_priv, qp_info, wc, port_num, recv, response);
}
static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
struct ib_wc *wc)
static void ib_mad_recv_done(struct ib_cq *cq, struct ib_wc *wc)
{
struct ib_mad_port_private *port_priv = cq->cq_context;
struct ib_mad_list_head *mad_list =
container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
struct ib_mad_qp_info *qp_info;
struct ib_mad_private_header *mad_priv_hdr;
struct ib_mad_private *recv, *response = NULL;
struct ib_mad_list_head *mad_list;
struct ib_mad_agent_private *mad_agent;
int port_num;
int ret = IB_MAD_RESULT_SUCCESS;
@ -2199,7 +2193,17 @@ static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
u16 resp_mad_pkey_index = 0;
bool opa;
mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
if (list_empty_careful(&port_priv->port_list))
return;
if (wc->status != IB_WC_SUCCESS) {
/*
* Receive errors indicate that the QP has entered the error
* state - error handling/shutdown code will cleanup
*/
return;
}
qp_info = mad_list->mad_queue->qp_info;
dequeue_mad(mad_list);
@ -2240,7 +2244,7 @@ static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
response = alloc_mad_private(mad_size, GFP_KERNEL);
if (!response) {
dev_err(&port_priv->device->dev,
"ib_mad_recv_done_handler no memory for response buffer\n");
"%s: no memory for response buffer\n", __func__);
goto out;
}
@ -2426,11 +2430,12 @@ done:
spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
}
static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
struct ib_wc *wc)
static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc)
{
struct ib_mad_port_private *port_priv = cq->cq_context;
struct ib_mad_list_head *mad_list =
container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
struct ib_mad_list_head *mad_list;
struct ib_mad_qp_info *qp_info;
struct ib_mad_queue *send_queue;
struct ib_send_wr *bad_send_wr;
@ -2438,7 +2443,14 @@ static void ib_mad_send_done_handler(struct ib_mad_port_private *port_priv,
unsigned long flags;
int ret;
mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
if (list_empty_careful(&port_priv->port_list))
return;
if (wc->status != IB_WC_SUCCESS) {
if (!ib_mad_send_error(port_priv, wc))
return;
}
mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
mad_list);
send_queue = mad_list->mad_queue;
@ -2503,24 +2515,15 @@ static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
}
static void mad_error_handler(struct ib_mad_port_private *port_priv,
struct ib_wc *wc)
static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
struct ib_wc *wc)
{
struct ib_mad_list_head *mad_list;
struct ib_mad_qp_info *qp_info;
struct ib_mad_list_head *mad_list =
container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
struct ib_mad_qp_info *qp_info = mad_list->mad_queue->qp_info;
struct ib_mad_send_wr_private *mad_send_wr;
int ret;
/* Determine if failure was a send or receive */
mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
qp_info = mad_list->mad_queue->qp_info;
if (mad_list->mad_queue == &qp_info->recv_queue)
/*
* Receive errors indicate that the QP has entered the error
* state - error handling/shutdown code will cleanup
*/
return;
/*
* Send errors will transition the QP to SQE - move
* QP to RTS and repost flushed work requests
@ -2535,10 +2538,9 @@ static void mad_error_handler(struct ib_mad_port_private *port_priv,
mad_send_wr->retry = 0;
ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr.wr,
&bad_send_wr);
if (ret)
ib_mad_send_done_handler(port_priv, wc);
} else
ib_mad_send_done_handler(port_priv, wc);
if (!ret)
return false;
}
} else {
struct ib_qp_attr *attr;
@ -2552,48 +2554,14 @@ static void mad_error_handler(struct ib_mad_port_private *port_priv,
kfree(attr);
if (ret)
dev_err(&port_priv->device->dev,
"mad_error_handler - ib_modify_qp to RTS : %d\n",
ret);
"%s - ib_modify_qp to RTS: %d\n",
__func__, ret);
else
mark_sends_for_retry(qp_info);
}
ib_mad_send_done_handler(port_priv, wc);
}
}
/*
* IB MAD completion callback
*/
static void ib_mad_completion_handler(struct work_struct *work)
{
struct ib_mad_port_private *port_priv;
struct ib_wc wc;
int count = 0;
port_priv = container_of(work, struct ib_mad_port_private, work);
ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
if (wc.status == IB_WC_SUCCESS) {
switch (wc.opcode) {
case IB_WC_SEND:
ib_mad_send_done_handler(port_priv, &wc);
break;
case IB_WC_RECV:
ib_mad_recv_done_handler(port_priv, &wc);
break;
default:
BUG_ON(1);
break;
}
} else
mad_error_handler(port_priv, &wc);
if (++count > MAD_COMPLETION_PROC_LIMIT) {
queue_work(port_priv->wq, &port_priv->work);
break;
}
}
return true;
}
static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
@ -2735,7 +2703,7 @@ static void local_completions(struct work_struct *work)
* before request
*/
build_smp_wc(recv_mad_agent->agent.qp,
(unsigned long) local->mad_send_wr,
local->mad_send_wr->send_wr.wr.wr_cqe,
be16_to_cpu(IB_LID_PERMISSIVE),
local->mad_send_wr->send_wr.pkey_index,
recv_mad_agent->agent.port_num, &wc);
@ -2875,17 +2843,6 @@ static void timeout_sends(struct work_struct *work)
spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
}
static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
{
struct ib_mad_port_private *port_priv = cq->cq_context;
unsigned long flags;
spin_lock_irqsave(&ib_mad_port_list_lock, flags);
if (!list_empty(&port_priv->port_list))
queue_work(port_priv->wq, &port_priv->work);
spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
}
/*
* Allocate receive MADs and post receive WRs for them
*/
@ -2933,8 +2890,9 @@ static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
break;
}
mad_priv->header.mapping = sg_list.addr;
recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
mad_priv->header.mad_list.mad_queue = recv_queue;
mad_priv->header.mad_list.cqe.done = ib_mad_recv_done;
recv_wr.wr_cqe = &mad_priv->header.mad_list.cqe;
/* Post receive WR */
spin_lock_irqsave(&recv_queue->lock, flags);
@ -3171,7 +3129,6 @@ static int ib_mad_port_open(struct ib_device *device,
unsigned long flags;
char name[sizeof "ib_mad123"];
int has_smi;
struct ib_cq_init_attr cq_attr = {};
if (WARN_ON(rdma_max_mad_size(device, port_num) < IB_MGMT_MAD_SIZE))
return -EFAULT;
@ -3199,10 +3156,8 @@ static int ib_mad_port_open(struct ib_device *device,
if (has_smi)
cq_size *= 2;
cq_attr.cqe = cq_size;
port_priv->cq = ib_create_cq(port_priv->device,
ib_mad_thread_completion_handler,
NULL, port_priv, &cq_attr);
port_priv->cq = ib_alloc_cq(port_priv->device, port_priv, cq_size, 0,
IB_POLL_WORKQUEUE);
if (IS_ERR(port_priv->cq)) {
dev_err(&device->dev, "Couldn't create ib_mad CQ\n");
ret = PTR_ERR(port_priv->cq);
@ -3231,7 +3186,6 @@ static int ib_mad_port_open(struct ib_device *device,
ret = -ENOMEM;
goto error8;
}
INIT_WORK(&port_priv->work, ib_mad_completion_handler);
spin_lock_irqsave(&ib_mad_port_list_lock, flags);
list_add_tail(&port_priv->port_list, &ib_mad_port_list);
@ -3258,7 +3212,7 @@ error7:
error6:
ib_dealloc_pd(port_priv->pd);
error4:
ib_destroy_cq(port_priv->cq);
ib_free_cq(port_priv->cq);
cleanup_recv_queue(&port_priv->qp_info[1]);
cleanup_recv_queue(&port_priv->qp_info[0]);
error3:
@ -3291,7 +3245,7 @@ static int ib_mad_port_close(struct ib_device *device, int port_num)
destroy_mad_qp(&port_priv->qp_info[1]);
destroy_mad_qp(&port_priv->qp_info[0]);
ib_dealloc_pd(port_priv->pd);
ib_destroy_cq(port_priv->cq);
ib_free_cq(port_priv->cq);
cleanup_recv_queue(&port_priv->qp_info[1]);
cleanup_recv_queue(&port_priv->qp_info[0]);
/* XXX: Handle deallocation of MAD registration tables */

2
drivers/infiniband/core/mad_priv.h
View File

@ -64,6 +64,7 @@
struct ib_mad_list_head {
struct list_head list;
struct ib_cqe cqe;
struct ib_mad_queue *mad_queue;
};
@ -204,7 +205,6 @@ struct ib_mad_port_private {
struct ib_mad_mgmt_version_table version[MAX_MGMT_VERSION];
struct list_head agent_list;
struct workqueue_struct *wq;
struct work_struct work;
struct ib_mad_qp_info qp_info[IB_MAD_QPS_CORE];
};