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    CIFS: SMBD: Upper layer performs SMB read via RDMA write through memory registration · bd3dcc6a
    Long Li 提交于
    If I/O size is larger than rdma_readwrite_threshold, use RDMA write for
    SMB read by specifying channel SMB2_CHANNEL_RDMA_V1 or
    SMB2_CHANNEL_RDMA_V1_INVALIDATE in the SMB packet, depending on SMB dialect
    used. Append a smbd_buffer_descriptor_v1 to the end of the SMB packet and fill
    in other values to indicate this SMB read uses RDMA write.
    
    There is no need to read from the transport for incoming payload. At the time
    SMB read response comes back, the data is already transferred and placed in the
    pages by RDMA hardware.
    
    When SMB read is finished, deregister the memory regions if RDMA write is used
    for this SMB read. smbd_deregister_mr may need to do local invalidation and
    sleep, if server remote invalidation is not used.
    
    There are situations where the MID may not be created on I/O failure, under
    which memory region is deregistered when read data context is released.
    Signed-off-by: NLong Li <longli@microsoft.com>
    Signed-off-by: NSteve French <smfrench@gmail.com>
    Reviewed-by: NPavel Shilovsky <pshilov@microsoft.com>
    Reviewed-by: NRonnie Sahlberg <lsahlber@redhat.com>
    bd3dcc6a
file.c 105.9 KB