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IB/cm: Endianness annotations
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Mostly update the RB tree comparisons to force __be types to normal
integers, but the change to cm_format_sidr_req() is a real fix:
param->path->pkey is already __be16.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
Acked-by: Sean Hefty <sean.hefty@intel.com>
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Roland Dreier committed Apr 17, 2008
1 parent d2ae16d commit a88f488
Showing 1 changed file with 44 additions and 19 deletions.
63 changes: 44 additions & 19 deletions drivers/infiniband/core/cm.c
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Original file line number Diff line number Diff line change
Expand Up @@ -467,6 +467,31 @@ static int cm_compare_private_data(u8 *private_data,
return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE);
}

/*
* Trivial helpers to strip endian annotation and compare; the
* endianness doesn't actually matter since we just need a stable
* order for the RB tree.
*/
static int be32_lt(__be32 a, __be32 b)
{
return (__force u32) a < (__force u32) b;
}

static int be32_gt(__be32 a, __be32 b)
{
return (__force u32) a > (__force u32) b;
}

static int be64_lt(__be64 a, __be64 b)
{
return (__force u64) a < (__force u64) b;
}

static int be64_gt(__be64 a, __be64 b)
{
return (__force u64) a > (__force u64) b;
}

static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
{
struct rb_node **link = &cm.listen_service_table.rb_node;
Expand All @@ -492,9 +517,9 @@ static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
link = &(*link)->rb_left;
else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
link = &(*link)->rb_right;
else if (service_id < cur_cm_id_priv->id.service_id)
else if (be64_lt(service_id, cur_cm_id_priv->id.service_id))
link = &(*link)->rb_left;
else if (service_id > cur_cm_id_priv->id.service_id)
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;
Expand Down Expand Up @@ -527,9 +552,9 @@ static struct cm_id_private * cm_find_listen(struct ib_device *device,
node = node->rb_left;
else if (device > cm_id_priv->id.device)
node = node->rb_right;
else if (service_id < cm_id_priv->id.service_id)
else if (be64_lt(service_id, cm_id_priv->id.service_id))
node = node->rb_left;
else if (service_id > cm_id_priv->id.service_id)
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;
Expand All @@ -552,13 +577,13 @@ static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
parent = *link;
cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
remote_id_node);
if (remote_id < cur_timewait_info->work.remote_id)
if (be32_lt(remote_id, cur_timewait_info->work.remote_id))
link = &(*link)->rb_left;
else if (remote_id > cur_timewait_info->work.remote_id)
else if (be32_gt(remote_id, cur_timewait_info->work.remote_id))
link = &(*link)->rb_right;
else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
link = &(*link)->rb_left;
else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
link = &(*link)->rb_right;
else
return cur_timewait_info;
Expand All @@ -578,13 +603,13 @@ static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
while (node) {
timewait_info = rb_entry(node, struct cm_timewait_info,
remote_id_node);
if (remote_id < timewait_info->work.remote_id)
if (be32_lt(remote_id, timewait_info->work.remote_id))
node = node->rb_left;
else if (remote_id > timewait_info->work.remote_id)
else if (be32_gt(remote_id, timewait_info->work.remote_id))
node = node->rb_right;
else if (remote_ca_guid < timewait_info->remote_ca_guid)
else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid))
node = node->rb_left;
else if (remote_ca_guid > timewait_info->remote_ca_guid)
else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid))
node = node->rb_right;
else
return timewait_info;
Expand All @@ -605,13 +630,13 @@ static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
parent = *link;
cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
remote_qp_node);
if (remote_qpn < cur_timewait_info->remote_qpn)
if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn))
link = &(*link)->rb_left;
else if (remote_qpn > cur_timewait_info->remote_qpn)
else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn))
link = &(*link)->rb_right;
else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
link = &(*link)->rb_left;
else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
link = &(*link)->rb_right;
else
return cur_timewait_info;
Expand All @@ -635,9 +660,9 @@ static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
parent = *link;
cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
sidr_id_node);
if (remote_id < cur_cm_id_priv->id.remote_id)
if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id))
link = &(*link)->rb_left;
else if (remote_id > cur_cm_id_priv->id.remote_id)
else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id))
link = &(*link)->rb_right;
else {
int cmp;
Expand Down Expand Up @@ -2848,7 +2873,7 @@ static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
sidr_req_msg->request_id = cm_id_priv->id.local_id;
sidr_req_msg->pkey = cpu_to_be16(param->path->pkey);
sidr_req_msg->pkey = param->path->pkey;
sidr_req_msg->service_id = param->service_id;

if (param->private_data && param->private_data_len)
Expand Down

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