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umad_set_grh(3) — Linux manual page

UMAD_SET_GRH(3)         OpenIB Programmer's ManualUMAD_SET_GRH(3)

NAME        top

       umad_set_grh - set GRH fields within umad buffer using host       ordering

SYNOPSIS        top

#include <infiniband/umad.h>int umad_set_grh(void*umad, void*mad_addr);

DESCRIPTION        top

umad_set_grh()sets the GRH fields (grh_present, gid, hop_limit,       traffic_class, flow_label) within the specifiedumad buffer based       on themad_addr supplied. The providedmad_addr fields are       expected to be in host order.  If themad_addr pointer supplied is       NULL, no GRH is set.  The argumentmad_addr is a pointer to anib_mad_addr_t struct, as specified in<infiniband/umad.h>.  The       argumentumad is a pointer to anib_user_mad_t struct, as       specified in<infiniband/umad.h>.       typedef struct ib_mad_addr {               uint32_t qpn;               uint32_t qkey;               uint16_t lid;               uint8_t  sl;               uint8_t  path_bits;               uint8_t  grh_present;               uint8_t  gid_index;               uint8_t  hop_limit;               uint8_t  traffic_class;               uint8_t  gid[16];               uint32_t flow_label;       } ib_mad_addr_t;       typedef struct ib_user_mad {               uint32_t agent_id;               uint32_t status;               uint32_t timeout_ms;               uint32_t retries;               uint32_t length;               ib_mad_addr_t addr;               uint8_t  data[0];       } ib_user_mad_t;

RETURN VALUE        top

umad_set_grh()returns 0 on success, and a negative value on       errors. Currently, there are no errors indicated.

SEE ALSO        top

umad_set_grh_net(3)

AUTHOR        top

       Hal Rosenstock <halr@voltaire.com>

COLOPHON        top

       This page is part of therdma-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 2025-08-11.  (At       that time, the date of the most recent commit that was found in       the repository was 2025-08-04.)  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 isnot part of the original manual page), send a mail to       man-pages@man7.orgOpenIB                         May 24, 2007UMAD_SET_GRH(3)

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