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.\" -*- nroff -*-
.\"
.TH IBV_MODIFY_QP 3 2006-10-31 libibverbs "Libibverbs Programmer's Manual"
.SH "NAME"
ibv_modify_qp \- modify the attributes of a queue pair (QP)
.SH "SYNOPSIS"
.nf
.B #include <infiniband/verbs.h>
.sp
.BI "int ibv_modify_qp(struct ibv_qp " "*qp" ", struct ibv_qp_attr " "*attr" ,
.BI " int " "attr_mask" );
.fi
.SH "DESCRIPTION"
.B ibv_modify_qp()
modifies the attributes of QP
.I qp
with the attributes in
.I attr
according to the mask
.I attr_mask\fR.
The argument \fIattr\fR is an ibv_qp_attr struct, as defined in <infiniband/verbs.h>.
.PP
.nf
struct ibv_qp_attr {
.in +8
enum ibv_qp_state qp_state; /* Move the QP to this state */
enum ibv_qp_state cur_qp_state; /* Assume this is the current QP state */
enum ibv_mtu path_mtu; /* Path MTU (valid only for RC/UC QPs) */
enum ibv_mig_state path_mig_state; /* Path migration state (valid if HCA supports APM) */
uint32_t qkey; /* Q_Key for the QP (valid only for UD QPs) */
uint32_t rq_psn; /* PSN for receive queue (valid only for RC/UC QPs) */
uint32_t sq_psn; /* PSN for send queue (valid only for RC/UC QPs) */
uint32_t dest_qp_num; /* Destination QP number (valid only for RC/UC QPs) */
int qp_access_flags; /* Mask of enabled remote access operations (valid only for RC/UC QPs) */
struct ibv_qp_cap cap; /* QP capabilities (valid if HCA supports QP resizing) */
struct ibv_ah_attr ah_attr; /* Primary path address vector (valid only for RC/UC QPs) */
struct ibv_ah_attr alt_ah_attr; /* Alternate path address vector (valid only for RC/UC QPs) */
uint16_t pkey_index; /* Primary P_Key index */
uint16_t alt_pkey_index; /* Alternate P_Key index */
uint8_t en_sqd_async_notify; /* Enable SQD.drained async notification (Valid only if qp_state is SQD) */
uint8_t sq_draining; /* Is the QP draining? Irrelevant for ibv_modify_qp() */
uint8_t max_rd_atomic; /* Number of outstanding RDMA reads & atomic operations on the destination QP (valid only for RC QPs) */
uint8_t max_dest_rd_atomic; /* Number of responder resources for handling incoming RDMA reads & atomic operations (valid only for RC QPs) */
uint8_t min_rnr_timer; /* Minimum RNR NAK timer (valid only for RC QPs) */
uint8_t port_num; /* Primary port number */
uint8_t timeout; /* Local ack timeout for primary path (valid only for RC QPs) */
uint8_t retry_cnt; /* Retry count (valid only for RC QPs) */
uint8_t rnr_retry; /* RNR retry (valid only for RC QPs) */
uint8_t alt_port_num; /* Alternate port number */
uint8_t alt_timeout; /* Local ack timeout for alternate path (valid only for RC QPs) */
.in -8
};
.fi
.PP
For details on struct ibv_qp_cap see the description of
.B ibv_create_qp()\fR.
For details on struct ibv_ah_attr see the description of
.B ibv_create_ah()\fR.
.PP
The argument
.I attr_mask
specifies the QP attributes to be modified.
The argument is either 0 or the bitwise OR of one or more of the following flags:
.PP
.TP
.B IBV_QP_STATE \fR Modify qp_state
.TP
.B IBV_QP_CUR_STATE \fR Set cur_qp_state
.TP
.B IBV_QP_EN_SQD_ASYNC_NOTIFY \fR Set en_sqd_async_notify
.TP
.B IBV_QP_ACCESS_FLAGS \fR Set qp_access_flags
.TP
.B IBV_QP_PKEY_INDEX \fR Set pkey_index
.TP
.B IBV_QP_PORT \fR Set port_num
.TP
.B IBV_QP_QKEY \fR Set qkey
.TP
.B IBV_QP_AV \fR Set ah_attr
.TP
.B IBV_QP_PATH_MTU \fR Set path_mtu
.TP
.B IBV_QP_TIMEOUT \fR Set timeout
.TP
.B IBV_QP_RETRY_CNT \fR Set retry_cnt
.TP
.B IBV_QP_RNR_RETRY \fR Set rnr_retry
.TP
.B IBV_QP_RQ_PSN \fR Set rq_psn
.TP
.B IBV_QP_MAX_QP_RD_ATOMIC \fR Set max_rd_atomic
.TP
.B IBV_QP_ALT_PATH \fR Set the alternative path via: alt_ah_attr, alt_pkey_index, alt_port_num, alt_timeout
.TP
.B IBV_QP_MIN_RNR_TIMER \fR Set min_rnr_timer
.TP
.B IBV_QP_SQ_PSN \fR Set sq_psn
.TP
.B IBV_QP_MAX_DEST_RD_ATOMIC \fR Set max_dest_rd_atomic
.TP
.B IBV_QP_PATH_MIG_STATE \fR Set path_mig_state
.TP
.B IBV_QP_CAP \fR Set cap
.TP
.B IBV_QP_DEST_QPN \fR Set dest_qp_num
.SH "RETURN VALUE"
.B ibv_modify_qp()
returns 0 on success, or the value of errno on failure (which indicates the failure reason).
.SH "NOTES"
If any of the modify attributes or the modify mask are invalid, none
of the attributes will be modified (including the QP state).
.PP
Not all devices support resizing QPs. To check if a device supports it, check if the
.B IBV_DEVICE_RESIZE_MAX_WR
bit is set in the device capabilities flags.
.PP
Not all devices support alternate paths. To check if a device supports it, check if the
.B IBV_DEVICE_AUTO_PATH_MIG
bit is set in the device capabilities flags.
.PP
The following tables indicate for each QP Transport Service Type, the
minimum list of attributes that must be changed upon transitioning QP
state from: Reset \-\-> Init \-\-> RTR \-\-> RTS.
.PP
.nf
For QP Transport Service Type \fB IBV_QPT_UD\fR:
.sp
Next state Required attributes
\-\-\-\-\-\-\-\-\-\- \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
Init \fB IBV_QP_STATE, IBV_QP_PKEY_INDEX, IBV_QP_PORT, \fR
\fB IBV_QP_QKEY \fR
RTR \fB IBV_QP_STATE \fR
RTS \fB IBV_QP_STATE, IBV_QP_SQ_PSN \fR
.fi
.PP
.nf
For QP Transport Service Type \fB IBV_QPT_UC\fR:
.sp
Next state Required attributes
\-\-\-\-\-\-\-\-\-\- \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
Init \fB IBV_QP_STATE, IBV_QP_PKEY_INDEX, IBV_QP_PORT, \fR
\fB IBV_QP_ACCESS_FLAGS \fR
RTR \fB IBV_QP_STATE, IBV_QP_AV, IBV_QP_PATH_MTU, \fR
\fB IBV_QP_DEST_QPN, IBV_QP_RQ_PSN \fR
RTS \fB IBV_QP_STATE, IBV_QP_SQ_PSN \fR
.fi
.PP
.nf
For QP Transport Service Type \fB IBV_QPT_RC\fR:
.sp
Next state Required attributes
\-\-\-\-\-\-\-\-\-\- \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
Init \fB IBV_QP_STATE, IBV_QP_PKEY_INDEX, IBV_QP_PORT, \fR
\fB IBV_QP_ACCESS_FLAGS \fR
RTR \fB IBV_QP_STATE, IBV_QP_AV, IBV_QP_PATH_MTU, \fR
\fB IBV_QP_DEST_QPN, IBV_QP_RQ_PSN, \fR
\fB IBV_QP_MAX_DEST_RD_ATOMIC, IBV_QP_MIN_RNR_TIMER \fR
RTS \fB IBV_QP_STATE, IBV_QP_SQ_PSN, IBV_QP_MAX_QP_RD_ATOMIC, \fR
\fB IBV_QP_RETRY_CNT, IBV_QP_RNR_RETRY, IBV_QP_TIMEOUT \fR
.fi
.SH "SEE ALSO"
.BR ibv_create_qp (3),
.BR ibv_destroy_qp (3),
.BR ibv_query_qp (3),
.BR ibv_create_ah (3)
.SH "AUTHORS"
.TP
Dotan Barak <dotanba@gmail.com>