SMCSS(8) Linux Programmer's Manual SMCSS(8)

smcss - print information about the AF_SMC sockets and link groups

smcss [--debug|-d] [--smcd|-D] [--wide|-W]

smcss {--all|-a} [--debug|-d] [--smcd|-D] [--wide|-W]

smcss [--debug|-d] [--smcr|-R] [--wide|-W]

smcss {--all|-a} [--debug|-d] [--smcr|-R] [--wide|-W]

smcss {--listening|-l} [--wide|-W]

smcss {--version|-v}

smcss {--help|-h}

smcss prints information about the Linux AF_SMC sockets and link groups. The type of information printed is controlled by the first argument, as follows:

(none)

displays a list of connecting, closing, or connected SMC sockets with basic information.

displays all types of SMC sockets: listening, opening, closing, and connected.

shows listening sockets only. These are omitted by default.

displays additional debug information, such as shutdown state.

displays additional SMC-D specific information. Shows SMC-D sockets only.

displays usage information.

displays additional SMC-R specific information. Shows SMC-R sockets only.

displays program version.

do not truncate IP addresses.

The state of the socket. The state can be one of these values:

The SMC socket is being initialized. It is not connected nor listening yet.
The SMC socket is closed. It is not connected nor listening anymore.
The SMC socket is a listening socket, waiting for incoming connection requests.
The SMC socket has an established connection. In this state, the TCP connection is fully established, rendezvous processing has been completed, and SMC peers can exchange data via RDMA.
No further data will be sent to the peer.
No further data will be sent to or received from the peer.
No further data will be received from the peer.
No further data will be received from or sent to the peer.
The peer has closed the socket.
The socket is closed locally.
The socket was abnormally closed locally.
The peer has closed the socket abnormally.

User ID of the SMC socket.

Inode attribute of the socket.

Address and port number of the local end of the SMC socket. The displayed address is truncated when it ends with '..'. -W, --wide can be used to display addresses untruncated.

Address and port number of the remote end of the socket. Analogous to "Local Address".

When the socket is explicitly bound with setsockopt option SO_BINDTODEVICE then Intf shows the interface number of the Ethernet device to which the socket is bound.

The SMC socket uses SMC-D for data exchange.
The SMC socket uses SMC-R for data exchange.
The SMC socket uses the TCP protocol for data exchange, because an SMC connection could not be established.

Linux error codes:

0x01010000
Out of memory
0x02010000
Timeout while waiting for confirm link message over RDMA device
0x02020000
Timeout while waiting for RDMA device to be added
0x03000000
Configuration error
0x03010000
Peer does not support SMC
0x03020000
Connection uses IPsec
0x03030000
No SMC devices found (R and D)
0x03030001
No ISM device for SMC-D found
0x03030002
No RDMA device for SMC-R found
0x03030003
Hardware has no ISMv2 support
0x03030004
Peer sent no SMCv2 extension
0x03030005
Peer sent no SMC-Dv2 extension
0x03030006
Peer sent no ISMv2 SEID
0x03030007
No SMC-Dv2 device found, but required
0x03030008
Peer sent no UEID
0x03040000
SMC modes mismatch (R or D)
0x03050000
Peer has eyecatcher in RMBE
0x03060000
Fastopen sockopt not supported
0x03070000
IP prefix / subnet mismatch
0x03080000
Error retrieving VLAN ID of IP device
0x03090000
Error while registering VLAN ID on ISM device
0x030a0000
No active SMC-R link in link group
0x030b0000
SMC-R link from server not found
0x030c0000
SMC version mismatch
0x030d0000
SMC-D connection limit reached
0x030e0000
SMC-Rv2 connection found no route to peer
0x030f0000
SMC-Rv2 connection mismatch direct/indirect with peer 0x04000000 Synchronization error
0x05000000
Peer declined during handshake
0x09990000
Internal error
0x09990001
rtoken handling failed
0x09990002
RDMA link failed
0x09990003
RMB registration failed

<->
The SMC socket has not been shut down.
The SMC socket is shut down one-way and cannot receive data.
<-W
The SMC socket is shut down one-way and cannot send data.
The SMC socket is shut down in both ways and cannot receive or send data.

Unique ID of the SMC socket connection.

Size of the to-be-sent window of the SMC socket connection.

Size of the receiving window of the SMC socket connection (filled by peer).

Size of the peer receiving window of the SMC socket connection (to fill during RDMA-transfer).

Describes the current cursor location of the "Rcvbuf" for data to be received from the peer.

Describes the current cursor location of the "Peerbuf" for data sent to peer and confirmed by the peer.

SMC socket connection flags set by and received from the peer.

Describes the current cursor location of the "Peerbuf" for data sent to peer.

Describes the current cursor location of the "Rcvbuf" for data received from the peer and confirmed to the peer.

SMC socket connection flags set locally and sent to the peer.

Describes the current cursor location of the "Sndbuf" for data to be sent. The data is to be moved to the "Peerbuf".

Describes the current cursor location of the "Sndbuf" for data sent. The data was moved to the "Peerbuf".

Describes the current cursor location of the "Sndbuf" for data sent and send completion confirmed. The data was moved to the "Peerbuf" and completion was confirmed.

The link group of the SMC socket is used for client connections.
The link group of the SMC socket is used for server connections.

Name of the RoCE device used by the link group to which the SMC socket belongs.

Port of the RoCE device used by the link group to which the SMC socket belongs.

Unique link ID of the link within the link group to which the SMC socket belongs.

Gid of the RoCE port used by the link group to which the SMC socket belongs.

Gid of the Foreign RoCE port used by the link group to which the SMC socket belongs.

tbd.

Successful smcss commands return 0 and display the requested socket state table or link group information. If an error occurs, smcss writes a message to stderr and completes with a return code other than 0.

af_smc(7), smc_chk(8) smc_rnics(8), smc_run(8), smc_pnet(8), smcd(8), smcr(8)

June 2018 smc-tools