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mlx5dv_dci_stream_id_reset(3) mlx5dv_dci_stream_id_reset(3)


mlx5dv_dci_stream_id_reset - Reset stream_id of a given DCI QP


#include <infiniband/mlx5dv.h>
int mlx5dv_dci_stream_id_reset(struct ibv_qp *qp, uint16_t stream_id);


Used by SW to reset an errored stream_id in the HW DCI context.

On work completion with error, the application should call ibv_query_qp() to check if the QP was moved to an error state, or it’s still operational (in RTS state), which means that the specific stream_id that caused the completion with error is in error state.

Errors which are stream related will cause only that stream_id’s work request to be flushed as they are handled in order in the send queue. Once all stream_id WR’s are flushed, application should reset the errored stream_id by calling mlx5dv_dci_stream_id_reset(). Work requested for other stream_id’s will continue to be processed by the QP. The DCI QP will move to an error state and stop operating once the number of unique stream_id in error reaches the DCI QP’s `log_num_errored' streams defined by SW.

Application should use the `wr_id' in the ibv_wc to find the stream_id from it’s private context.


The ibv_qp object to issue the action on.
The DCI stream channel id that need to be reset.


Returns 0 on success, or the value of errno on failure (which indicates the failure reason).


Lior Nahmanson <>