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IB/umad: Add P_Key index support

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Add support for setting the P_Key index of sent MADs and getting the
P_Key index of received MADs.  This requires a change to the layout of
the ABI structure struct ib_user_mad_hdr, so to avoid breaking
compatibility, we default to the old (unchanged) ABI and add a new
ioctl IB_USER_MAD_ENABLE_PKEY that allows applications that are aware
of the new ABI to opt into using it.

We plan on switching to the new ABI by default in a year or so, and
this patch adds a warning that is printed when an application uses the
old ABI, to push people towards converting to the new ABI.

Signed-off-by: Roland Dreier <[email protected]>
Reviewed-by: Sean Hefty <[email protected]>
Reviewed-by: Hal Rosenstock <[email protected]>
This commit is contained in:
Roland Dreier 2007-10-09 19:59:15 -07:00
commit 2be8e3ee8e
3 changed files with 135 additions and 29 deletions
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50
include/rdma/ib_user_mad.h
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@ -52,7 +52,7 @@
*/
/**
* ib_user_mad_hdr - MAD packet header
* ib_user_mad_hdr_old - Old version of MAD packet header without pkey_index
* @id - ID of agent MAD received with/to be sent with
* @status - 0 on successful receive, ETIMEDOUT if no response
* received (transaction ID in data[] will be set to TID of original
@ -71,6 +71,50 @@
* @gid - Remote GID in GRH
* @flow_label - Flow label in GRH
*/
struct ib_user_mad_hdr_old {
__u32 id;
__u32 status;
__u32 timeout_ms;
__u32 retries;
__u32 length;
__be32 qpn;
__be32 qkey;
__be16 lid;
__u8 sl;
__u8 path_bits;
__u8 grh_present;
__u8 gid_index;
__u8 hop_limit;
__u8 traffic_class;
__u8 gid[16];
__be32 flow_label;
};
/**
* ib_user_mad_hdr - MAD packet header
* This layout allows specifying/receiving the P_Key index. To use
* this capability, an application must call the
* IB_USER_MAD_ENABLE_PKEY ioctl on the user MAD file handle before
* any other actions with the file handle.
* @id - ID of agent MAD received with/to be sent with
* @status - 0 on successful receive, ETIMEDOUT if no response
* received (transaction ID in data[] will be set to TID of original
* request) (ignored on send)
* @timeout_ms - Milliseconds to wait for response (unset on receive)
* @retries - Number of automatic retries to attempt
* @qpn - Remote QP number received from/to be sent to
* @qkey - Remote Q_Key to be sent with (unset on receive)
* @lid - Remote lid received from/to be sent to
* @sl - Service level received with/to be sent with
* @path_bits - Local path bits received with/to be sent with
* @grh_present - If set, GRH was received/should be sent
* @gid_index - Local GID index to send with (unset on receive)
* @hop_limit - Hop limit in GRH
* @traffic_class - Traffic class in GRH
* @gid - Remote GID in GRH
* @flow_label - Flow label in GRH
* @pkey_index - P_Key index
*/
struct ib_user_mad_hdr {
__u32 id;
__u32 status;
@ -88,6 +132,8 @@ struct ib_user_mad_hdr {
__u8 traffic_class;
__u8 gid[16];
__be32 flow_label;
__u16 pkey_index;
__u8 reserved[6];
};
/**
@ -134,4 +180,6 @@ struct ib_user_mad_reg_req {
#define IB_USER_MAD_UNREGISTER_AGENT _IOW(IB_IOCTL_MAGIC, 2, __u32)
#define IB_USER_MAD_ENABLE_PKEY _IO(IB_IOCTL_MAGIC, 3)
#endif /* IB_USER_MAD_H */