IBV_CREATE_AH(3)        Libibverbs Programmer's Manual        IBV_CREATE_AH(3)

NAME
       ibv_create_ah, ibv_destroy_ah - create or destroy an address handle
       (AH)

SYNOPSIS
       #include <infiniband/verbs.h>

       struct ibv_ah *ibv_create_ah(struct ibv_pd *pd,
                                    struct ibv_ah_attr *attr);

       int ibv_destroy_ah(struct ibv_ah *ah);

DESCRIPTION
       ibv_create_ah() creates an address handle (AH) associated with the
       protection domain pd.  The argument attr is an ibv_ah_attr struct, as
       defined in <infiniband/verbs.h>.

       struct ibv_ah_attr {
               struct ibv_global_route grh;            /* Global Routing Header (GRH) attributes */
               uint16_t                dlid;           /* Destination LID */
               uint8_t                 sl;             /* Service Level */
               uint8_t                 src_path_bits;  /* Source path bits */
               uint8_t                 static_rate;    /* Maximum static rate */
               uint8_t                 is_global;      /* GRH attributes are valid */
               uint8_t                 port_num;       /* Physical port number */
       };

       struct ibv_global_route {
               union ibv_gid           dgid;           /* Destination GID or MGID */
               uint32_t                flow_label;     /* Flow label */
               uint8_t                 sgid_index;     /* Source GID index */
               uint8_t                 hop_limit;      /* Hop limit */
               uint8_t                 traffic_class;  /* Traffic class */
       };


       ibv_destroy_ah() destroys the AH ah.

RETURN VALUE
       ibv_create_ah() returns a pointer to the created AH, or NULL if the
       request fails.

NOTES
       If port flag IBV_QPF_GRH_REQUIRED is set then ibv_create_ah() must be
       created with definition of 'struct ibv_ah_attr { .is_global = 1; .grh =
       {...}; }'.

       ibv_destroy_ah() returns 0 on success, or the value of errno on failure
       (which indicates the failure reason).

SEE ALSO
       ibv_alloc_pd(3), ibv_init_ah_from_wc(3), ibv_create_ah_from_wc(3)

AUTHORS
       Dotan Barak <dotanba@gmail.com>

libibverbs                        2006-10-31                  IBV_CREATE_AH(3)