[PATCH v2 13/13] IB/cm: Remove compare_data checks

Haggai Eran
2015-07-26T15:33:52Z

Now that there are no ib_cm clients using the compare_data feature for
matching IB CM requests' private data, remove the compare_data parameter of
ib_cm_listen and remove the code implementing the feature.

Signed-off-by: Haggai Eran <haggaie-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
---
drivers/infiniband/core/cm.c | 109 ++++++--------------------------
drivers/infiniband/core/ucm.c | 3 +-
drivers/infiniband/ulp/ipoib/ipoib_cm.c | 2 +-
drivers/infiniband/ulp/srpt/ib_srpt.c | 2 +-
include/rdma/ib_cm.h | 14 +---
5 files changed, 23 insertions(+), 107 deletions(-)

diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c
index a05c17b336aa..73803a55edd6 100644
--- a/drivers/infiniband/core/cm.c
+++ b/drivers/infiniband/core/cm.c
@@ -222,7 +222,6 @@ struct cm_id_private {
/* todo: use alternate port on send failure */
struct cm_av av;
struct cm_av alt_av;
- struct ib_cm_compare_data *compare_data;

void *private_data;
__be64 tid;
@@ -443,40 +442,6 @@ static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
return cm_id_priv;
}

-static void cm_mask_copy(u32 *dst, const u32 *src, const u32 *mask)
-{
- int i;
-
- for (i = 0; i < IB_CM_COMPARE_SIZE; i++)
- dst[i] = src[i] & mask[i];
-}
-
-static int cm_compare_data(struct ib_cm_compare_data *src_data,
- struct ib_cm_compare_data *dst_data)
-{
- u32 src[IB_CM_COMPARE_SIZE];
- u32 dst[IB_CM_COMPARE_SIZE];
-
- if (!src_data || !dst_data)
- return 0;
-
- cm_mask_copy(src, src_data->data, dst_data->mask);
- cm_mask_copy(dst, dst_data->data, src_data->mask);
- return memcmp(src, dst, sizeof(src));
-}
-
-static int cm_compare_private_data(u32 *private_data,
- struct ib_cm_compare_data *dst_data)
-{
- u32 src[IB_CM_COMPARE_SIZE];
-
- if (!dst_data)
- return 0;
-
- cm_mask_copy(src, private_data, dst_data->mask);
- return memcmp(src, dst_data->data, sizeof(src));
-}
-
/*
* Trivial helpers to strip endian annotation and compare; the
* endianness doesn't actually matter since we just need a stable
@@ -509,18 +474,14 @@ static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
struct cm_id_private *cur_cm_id_priv;
__be64 service_id = cm_id_priv->id.service_id;
__be64 service_mask = cm_id_priv->id.service_mask;
- int data_cmp;

while (*link) {
parent = *link;
cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
service_node);
- data_cmp = cm_compare_data(cm_id_priv->compare_data,
- cur_cm_id_priv->compare_data);
if ((cur_cm_id_priv->id.service_mask & service_id) ==
(service_mask & cur_cm_id_priv->id.service_id) &&
- (cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
- !data_cmp)
+ (cm_id_priv->id.device == cur_cm_id_priv->id.device))
return cur_cm_id_priv;

if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
@@ -531,8 +492,6 @@ static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
link = &(*link)->rb_left;
else if (be64_gt(service_id, cur_cm_id_priv->id.service_id))
link = &(*link)->rb_right;
- else if (data_cmp < 0)
- link = &(*link)->rb_left;
else
link = &(*link)->rb_right;
}
@@ -542,20 +501,16 @@ static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
}

static struct cm_id_private * cm_find_listen(struct ib_device *device,
- __be64 service_id,
- u32 *private_data)
+ __be64 service_id)
{
struct rb_node *node = cm.listen_service_table.rb_node;
struct cm_id_private *cm_id_priv;
- int data_cmp;

while (node) {
cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
- data_cmp = cm_compare_private_data(private_data,
- cm_id_priv->compare_data);
if ((cm_id_priv->id.service_mask & service_id) ==
cm_id_priv->id.service_id &&
- (cm_id_priv->id.device == device) && !data_cmp)
+ (cm_id_priv->id.device == device))
return cm_id_priv;

if (device < cm_id_priv->id.device)
@@ -566,8 +521,6 @@ static struct cm_id_private * cm_find_listen(struct ib_device *device,
node = node->rb_left;
else if (be64_gt(service_id, cm_id_priv->id.service_id))
node = node->rb_right;
- else if (data_cmp < 0)
- node = node->rb_left;
else
node = node->rb_right;
}
@@ -939,7 +892,6 @@ retest:
wait_for_completion(&cm_id_priv->comp);
while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
cm_free_work(work);
- kfree(cm_id_priv->compare_data);
kfree(cm_id_priv->private_data);
kfree(cm_id_priv);
}
@@ -962,20 +914,11 @@ EXPORT_SYMBOL(ib_destroy_cm_id);
* range of service IDs. If set to 0, the service ID is matched
* exactly. This parameter is ignored if %service_id is set to
* IB_CM_ASSIGN_SERVICE_ID.
- * @compare_data: This parameter is optional. It specifies data that must
- * appear in the private data of a connection request for the specified
- * listen request.
- * @lock: If set, lock the cm.lock spin-lock when adding the id to the
- * listener tree. When false, the caller must already hold the spin-lock,
- * and compare_data must be NULL.
*/
static int __ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id,
- __be64 service_mask,
- struct ib_cm_compare_data *compare_data,
- bool lock)
+ __be64 service_mask)
{
struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
- unsigned long flags = 0;
int ret = 0;

service_mask = service_mask ? service_mask : ~cpu_to_be64(0);
@@ -988,22 +931,9 @@ static int __ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id,
if (cm_id->state != IB_CM_IDLE)
return -EINVAL;

- if (compare_data) {
- cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
- GFP_KERNEL);
- if (!cm_id_priv->compare_data)
- return -ENOMEM;
- cm_mask_copy(cm_id_priv->compare_data->data,
- compare_data->data, compare_data->mask);
- memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
- sizeof(compare_data->mask));
- }
-
cm_id->state = IB_CM_LISTEN;
- if (lock)
- spin_lock_irqsave(&cm.lock, flags);
-
++cm_id_priv->listen_sharecount;
+
if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
cm_id->service_mask = ~cpu_to_be64(0);
@@ -1016,22 +946,21 @@ static int __ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id,
if (cur_cm_id_priv) {
cm_id->state = IB_CM_IDLE;
--cm_id_priv->listen_sharecount;
- kfree(cm_id_priv->compare_data);
- cm_id_priv->compare_data = NULL;
ret = -EBUSY;
}
-
- if (lock)
- spin_unlock_irqrestore(&cm.lock, flags);
-
return ret;
}

-int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
- struct ib_cm_compare_data *compare_data)
+int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask)
{
- return __ib_cm_listen(cm_id, service_id, service_mask, compare_data,
- true);
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&cm.lock, flags);
+ ret = __ib_cm_listen(cm_id, service_id, service_mask);
+ spin_unlock_irqrestore(&cm.lock, flags);
+
+ return ret;
}
EXPORT_SYMBOL(ib_cm_listen);

@@ -1075,7 +1004,7 @@ struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device,
goto new_id;

/* Find an existing ID */
- cm_id_priv = cm_find_listen(device, service_id, NULL);
+ cm_id_priv = cm_find_listen(device, service_id);
if (cm_id_priv) {
if (cm_id->cm_handler != cm_handler || cm_id->context) {
/* Sharing an ib_cm_id with different handlers is not
@@ -1094,7 +1023,7 @@ struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device,

new_id:
/* Use newly created ID */
- err = __ib_cm_listen(cm_id, service_id, service_mask, NULL, false);
+ err = __ib_cm_listen(cm_id, service_id, service_mask);

spin_unlock_irqrestore(&cm.lock, flags);

@@ -1619,8 +1548,7 @@ static struct cm_id_private * cm_match_req(struct cm_work *work,

/* Find matching listen request. */
listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
- req_msg->service_id,
- req_msg->private_data);
+ req_msg->service_id);
if (!listen_cm_id_priv) {
cm_cleanup_timewait(cm_id_priv->timewait_info);
spin_unlock_irq(&cm.lock);
@@ -3168,8 +3096,7 @@ static int cm_sidr_req_handler(struct cm_work *work)
}
cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
cur_cm_id_priv = cm_find_listen(cm_id->device,
- sidr_req_msg->service_id,
- sidr_req_msg->private_data);
+ sidr_req_msg->service_id);
if (!cur_cm_id_priv) {
spin_unlock_irq(&cm.lock);
cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED);
diff --git a/drivers/infiniband/core/ucm.c b/drivers/infiniband/core/ucm.c
index 8cde48b96f19..6b4e8a008bc0 100644
--- a/drivers/infiniband/core/ucm.c
+++ b/drivers/infiniband/core/ucm.c
@@ -658,8 +658,7 @@ static ssize_t ib_ucm_listen(struct ib_ucm_file *file,
if (result)
goto out;

- result = ib_cm_listen(ctx->cm_id, cmd.service_id, cmd.service_mask,
- NULL);
+ result = ib_cm_listen(ctx->cm_id, cmd.service_id, cmd.service_mask);
out:
ib_ucm_ctx_put(ctx);
return result;
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_cm.c b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
index ee39be6ccfb0..9d321575d90e 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_cm.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
@@ -848,7 +848,7 @@ int ipoib_cm_dev_open(struct net_device *dev)
}

ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
- 0, NULL);
+ 0);
if (ret) {
printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
IPOIB_CM_IETF_ID | priv->qp->qp_num);
diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
index 4c59ceb40fff..3ab015b0236d 100644
--- a/drivers/infiniband/ulp/srpt/ib_srpt.c
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
@@ -3250,7 +3250,7 @@ static void srpt_add_one(struct ib_device *device)
* in the system as service_id; therefore, the target_id will change
* if this HCA is gone bad and replaced by different HCA
*/
- if (ib_cm_listen(sdev->cm_id, cpu_to_be64(srpt_service_guid), 0, NULL))
+ if (ib_cm_listen(sdev->cm_id, cpu_to_be64(srpt_service_guid), 0))
goto err_cm;

INIT_IB_EVENT_HANDLER(&sdev->event_handler, sdev->device,
diff --git a/include/rdma/ib_cm.h b/include/rdma/ib_cm.h
index 5b54cf77862e..17aca8e94093 100644
--- a/include/rdma/ib_cm.h
+++ b/include/rdma/ib_cm.h
@@ -105,8 +105,6 @@ enum ib_cm_data_size {
IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE = 216,
IB_CM_SIDR_REP_PRIVATE_DATA_SIZE = 136,
IB_CM_SIDR_REP_INFO_LENGTH = 72,
- /* compare done u32 at a time */
- IB_CM_COMPARE_SIZE = (64 / sizeof(u32))
};

struct ib_cm_id;
@@ -344,11 +342,6 @@ void ib_destroy_cm_id(struct ib_cm_id *cm_id);
#define IB_SDP_SERVICE_ID cpu_to_be64(0x0000000000010000ULL)
#define IB_SDP_SERVICE_ID_MASK cpu_to_be64(0xFFFFFFFFFFFF0000ULL)

-struct ib_cm_compare_data {
- u32 data[IB_CM_COMPARE_SIZE];
- u32 mask[IB_CM_COMPARE_SIZE];
-};
-
/**
* ib_cm_listen - Initiates listening on the specified service ID for
* connection and service ID resolution requests.
@@ -361,12 +354,9 @@ struct ib_cm_compare_data {
* range of service IDs. If set to 0, the service ID is matched
* exactly. This parameter is ignored if %service_id is set to
* IB_CM_ASSIGN_SERVICE_ID.
- * @compare_data: This parameter is optional. It specifies data that must
- * appear in the private data of a connection request for the specified
- * listen request.
*/
-int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
- struct ib_cm_compare_data *compare_data);
+int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id,
+ __be64 service_mask);

struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device,
ib_cm_handler cm_handler,