ibv_bind_mw(3) — Linux manual page


IBV_BIND_MW(3)       Libibverbs Programmer's Manual       IBV_BIND_MW(3)

NAME         top

       ibv_bind_mw - post a request to bind a type 1 memory window to a
       memory region

SYNOPSIS         top

       #include <infiniband/verbs.h>

       int ibv_bind_mw(struct ibv_qp *qp, struct ibv_mw *mw,
                       struct ibv_mw_bind *mw_bind);

DESCRIPTION         top

       ibv_bind_mw() posts to the queue pair qp a request to bind the
       memory window mw according to the details in mw_bind.

       The argument mw_bind is an ibv_mw_bind struct, as defined in

       struct ibv_mw_bind {
               uint64_t                     wr_id;           /* User defined WR ID */
               unsigned int                 send_flags;      /* Use ibv_send_flags */
               struct ibv_mw_bind_info      bind_info;       /* MW bind information */

       struct ibv_mw_bind_info {
               struct ibv_mr                *mr;             /* The MR to bind the MW to */
               uint64_t                     addr;            /* The address the MW should start at */
               uint64_t                     length;          /* The length (in bytes) the MW should span */
               unsigned int                 mw_access_flags; /* Access flags to the MW. Use ibv_access_flags */

       The QP Transport Service Type must be either UC, RC or XRC_SEND
       for bind operations.

       The attribute send_flags describes the properties of the WR. It
       is either 0 or the bitwise OR of one or more of the following

       IBV_SEND_FENCE  Set the fence indicator.

       IBV_SEND_SIGNALED  Set the completion notification indicator.
       Relevant only if QP was created with sq_sig_all=0

       The mw_access_flags define the allowed access to the MW after the
       bind completes successfully. It is either 0 or the bitwise OR of
       one or more of the following flags:

       IBV_ACCESS_REMOTE_WRITE  Enable Remote Write Access. Requires
       local write access to the MR.

       IBV_ACCESS_REMOTE_READ Enable Remote Read Access

       IBV_ACCESS_REMOTE_ATOMIC Enable Remote Atomic Operation Access
       (if supported). Requires local write access to the MR.

       IBV_ACCESS_ZERO_BASED If set, the address set on the
       'remote_addr' field on the WR will be an offset from the MW's
       start address.

RETURN VALUE         top

       ibv_bind_mw() returns 0 on success, or the value of errno on
       failure (which indicates the failure reason).  In case of a
       success, the R_key of the memory window after the bind is
       returned in the mw_bind->mw->rkey field.

NOTES         top

       The bind does not complete when the function return - it is
       merely posted to the QP. The user should keep a copy of the old
       R_key, and fix the mw structure if the subsequent CQE for the
       bind operation indicates a failure. The user may safely send the
       R_key using a send request on the same QP, (based on QP ordering
       rules: a send after a bind request on the same QP are always
       ordered), but must not transfer it to the remote in any other
       manner before reading a successful CQE.

       Note that for type 2 MW, one should directly post bind WR to the
       QP, using ibv_post_send.

SEE ALSO         top

       ibv_alloc_mw(3), ibv_post_send(3), ibv_poll_cq(3) ibv_reg_mr(3),

AUTHORS         top

       Majd Dibbiny <majd@mellanox.com>

       Yishai Hadas <yishaih@mellanox.com>

COLOPHON         top

       This page is part of the rdma-core (RDMA Core Userspace Libraries
       and Daemons) project.  Information about the project can be found
       at ⟨https://github.com/linux-rdma/rdma-core⟩.  If you have a bug
       report for this manual page, send it to
       linux-rdma@vger.kernel.org.  This page was obtained from the
       project's upstream Git repository
       ⟨https://github.com/linux-rdma/rdma-core.git⟩ on 2021-08-27.  (At
       that time, the date of the most recent commit that was found in
       the repository was 2021-08-18.)  If you discover any rendering
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       (which is not part of the original manual page), send a mail to

libibverbs                     2016-02-02                 IBV_BIND_MW(3)

Pages that refer to this page: ibv_alloc_mw(3)