3 .TH IBV_MODIFY_SRQ 3 2006-10-31 libibverbs "Libibverbs Programmer's Manual"
5 ibv_modify_srq \- modify attributes of a shared receive queue (SRQ)
8 .B #include <infiniband/verbs.h>
10 .BI "int ibv_modify_srq(struct ibv_srq " "*srq" ,
11 .BI " struct ibv_srq_attr " "*srq_attr" ,
12 .BI " int " "srq_attr_mask" );
16 modifies the attributes of SRQ
18 with the attributes in
22 The argument \fIsrq_attr\fR is an ibv_srq_attr struct, as defined in <infiniband/verbs.h>.
27 uint32_t max_wr; /* maximum number of outstanding work requests (WRs) in the SRQ */
28 uint32_t max_sge; /* number of scatter elements per WR (irrelevant for ibv_modify_srq) */
29 uint32_t srq_limit; /* the limit value of the SRQ */
36 specifies the SRQ attributes to be modified.
37 The argument is either 0 or the bitwise OR of one or more of the following flags:
40 .B IBV_SRQ_MAX_WR \fR Resize the SRQ
42 .B IBV_SRQ_LIMIT \fR Set the SRQ limit
45 returns 0 on success, or the value of errno on failure (which indicates the failure reason).
47 If any of the modify attributes is invalid, none of the attributes will be modified.
49 Not all devices support resizing SRQs. To check if a device supports it, check if the
50 .B IBV_DEVICE_SRQ_RESIZE
51 bit is set in the device capabilities flags.
53 Modifying the srq_limit arms the SRQ to produce an
54 .B IBV_EVENT_SRQ_LIMIT_REACHED
55 "low watermark" asynchronous event once the number of WRs in the SRQ drops below srq_limit.
57 .BR ibv_query_device (3),
58 .BR ibv_create_srq (3),
59 .BR ibv_destroy_srq (3),
63 Dotan Barak <dotanb@mellanox.co.il>