отправить запрос на привязку окна памяти типа 1 к области памяти (post a request to bind a type 1 memory window to a memory region)
Имя (Name)
ibv_bind_mw - post a request to bind a type 1 memory window to a
memory region
Синопсис (Synopsis)
#include <infiniband/verbs.h>
int ibv_bind_mw(struct ibv_qp *qp, struct ibv_mw *mw,
struct ibv_mw_bind *mw_bind);
Описание (Description)
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
<infiniband/verbs.h>.
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
flags:
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.
Возвращаемое значение (Return value)
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.
Примечание (Note)
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.
Смотри также (See also)
ibv_alloc_mw(3), ibv_post_send(3), ibv_poll_cq(3) ibv_reg_mr(3),
