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IB/srp: Add RDMA/CM support

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Since the SRP_LOGIN_REQ defined in the SRP standard is larger than
what fits in the RDMA/CM login request private data, introduce a new
login request format for the RDMA/CM.

Note: since srp_daemon and ibsrpdm rely on the subnet manager and
since there is no equivalent of the IB subnet manager in non-IB
networks, login has to be performed manually for non-IB networks.

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Bart Van Assche
2018-01-22 14:27:12 -08:00
committed by Doug Ledford
parent 172856eac7
commit 19f313438c
3 changed files with 603 additions and 151 deletions
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17
include/scsi/srp.h
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@@ -129,6 +129,23 @@ struct srp_login_req {
u8 target_port_id[16];
};
/**
* struct srp_login_req_rdma - RDMA/CM login parameters.
*
* RDMA/CM over InfiniBand can only carry 92 - 36 = 56 bytes of private
* data. The %srp_login_req_rdma structure contains the same information as
* %srp_login_req but with the reserved data removed.
*/
struct srp_login_req_rdma {
u64 tag;
__be16 req_buf_fmt;
u8 req_flags;
u8 opcode;
__be32 req_it_iu_len;
u8 initiator_port_id[16];
u8 target_port_id[16];
};
/*
* The SRP spec defines the size of the LOGIN_RSP structure to be 52
* bytes, so it needs to be packed to avoid having it padded to 56