|
HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
|
|
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | SEE ALSO | AUTHORS | COLOPHON |
|
|
|
IBV_MOD...E_LIMIT(3) Libibverbs Programmer's Manual IBV_MOD...E_LIMIT(3)
ibv_modify_qp_rate_limit - modify the send rate limits attributes
of a queue pair (QP)
#include <infiniband/verbs.h>
int ibv_modify_qp_rate_limit(struct ibv_qp *qp, struct ibv_qp_rate_limit_attr *attr);
ibv_modify_qp_rate_limit() modifies the send rate limiting packet
pacing attributes of QP qp with the attributes in attr. The
argument attr is an ibv_qp_rate_limit_attr struct, as defined in
<infiniband/verbs.h>.
The rate_limit defines the MAX send rate this QP will send as
long as the link in not blocked and there are work requests in
send queue.
Finer control for shaping the rate limit of a QP is achieved by
defining the max_burst_sz, single burst max bytes size and the
typical_pkt_sz, typical packet bytes size. These allow the device
to adjust the inter-burst gap delay required to correctly shape
the scheduling of sends to the wire in order to reach for
requested application requirements.
Setting a value of 0 for max_burst_sz or typical_pkt_sz will use
the devices defaults. typical_pkt_sz will default to the port's
MTU value.
struct ibv_qp_rate_limit_attr {
uint32_t rate_limit; /* kbps */
uint32_t max_burst_sz; /* bytes */
uint16_t typical_pkt_sz; /* bytes */
};
ibv_modify_qp_rate_limit() returns 0 on success, or the value of
errno on failure (which indicates the failure reason).
EINVAL
Invalid arguments.
EOPNOTSUPP
Function is not implemented for this device. (ENOSYS may
sometimes be returned by old versions of libibverbs).
ibv_create_qp(3), ibv_destroy_qp(3), ibv_modify_qp(3),
ibv_query_qp(3)
Alex Rosenbaum <[email protected]>
Bodong Wang <[email protected]>
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
[email protected]. This page was obtained from the
project's upstream Git repository
⟨https://github.com/linux-rdma/rdma-core.git⟩ on 2024-06-14. (At
that time, the date of the most recent commit that was found in
the repository was 2024-06-10.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
[email protected]
libibverbs 2018-01-09 IBV_MOD...E_LIMIT(3)
|
HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
|