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IB/uverbs: Support for query SRQ from userspace

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Add support to uverbs to handle querying userspace SRQs (shared
receive queues), including adding an ABI for marshalling requests and
responses.  The kernel midlayer already has the underlying
ib_query_srq() function.

Signed-off-by: Dotan Barak <dotanb@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Dotan Barak 2006-02-13 16:31:57 -08:00 committed by Roland Dreier
parent 7ccc9a24e0
commit 8bdb0e8632
4 changed files with 61 additions and 0 deletions
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1
drivers/infiniband/core/uverbs.h
View file

@ -195,6 +195,7 @@ IB_UVERBS_DECLARE_CMD(attach_mcast);
IB_UVERBS_DECLARE_CMD(detach_mcast);
IB_UVERBS_DECLARE_CMD(create_srq);
IB_UVERBS_DECLARE_CMD(modify_srq);
IB_UVERBS_DECLARE_CMD(query_srq);
IB_UVERBS_DECLARE_CMD(destroy_srq);
#endif /* UVERBS_H */

44
drivers/infiniband/core/uverbs_cmd.c
View file

@ -2,6 +2,7 @@
* Copyright (c) 2005 Topspin Communications. All rights reserved.
* Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
* Copyright (c) 2005 PathScale, Inc. All rights reserved.
* Copyright (c) 2006 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
@ -1923,6 +1924,49 @@ ssize_t ib_uverbs_modify_srq(struct ib_uverbs_file *file,
return ret ? ret : in_len;
}
ssize_t ib_uverbs_query_srq(struct ib_uverbs_file *file,
const char __user *buf,
int in_len, int out_len)
{
struct ib_uverbs_query_srq cmd;
struct ib_uverbs_query_srq_resp resp;
struct ib_srq_attr attr;
struct ib_srq *srq;
int ret;
if (out_len < sizeof resp)
return -ENOSPC;
if (copy_from_user(&cmd, buf, sizeof cmd))
return -EFAULT;
mutex_lock(&ib_uverbs_idr_mutex);
srq = idr_find(&ib_uverbs_srq_idr, cmd.srq_handle);
if (srq && srq->uobject->context == file->ucontext)
ret = ib_query_srq(srq, &attr);
else
ret = -EINVAL;
mutex_unlock(&ib_uverbs_idr_mutex);
if (ret)
goto out;
memset(&resp, 0, sizeof resp);
resp.max_wr = attr.max_wr;
resp.max_sge = attr.max_sge;
resp.srq_limit = attr.srq_limit;
if (copy_to_user((void __user *) (unsigned long) cmd.response,
&resp, sizeof resp))
ret = -EFAULT;
out:
return ret ? ret : in_len;
}
ssize_t ib_uverbs_destroy_srq(struct ib_uverbs_file *file,
const char __user *buf, int in_len,
int out_len)

1
drivers/infiniband/core/uverbs_main.c
View file

@ -108,6 +108,7 @@ static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
[IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast,
[IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq,
[IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq,
[IB_USER_VERBS_CMD_QUERY_SRQ] = ib_uverbs_query_srq,
[IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq,
};

15
include/rdma/ib_user_verbs.h
View file

@ -2,6 +2,7 @@
* Copyright (c) 2005 Topspin Communications. All rights reserved.
* Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
* Copyright (c) 2005 PathScale, Inc. All rights reserved.
* Copyright (c) 2006 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
@ -613,6 +614,20 @@ struct ib_uverbs_modify_srq {
__u64 driver_data[0];
};
struct ib_uverbs_query_srq {
__u64 response;
__u32 srq_handle;
__u32 reserved;
__u64 driver_data[0];
};
struct ib_uverbs_query_srq_resp {
__u32 max_wr;
__u32 max_sge;
__u32 srq_limit;
__u32 reserved;
};
struct ib_uverbs_destroy_srq {
__u64 response;
__u32 srq_handle;