ibv_create_qp_ex(3) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | AUTHORS | COLOPHON

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

NAME         top

       ibv_create_qp_ex, ibv_destroy_qp - create or destroy a queue pair
       (QP)

SYNOPSIS         top

       #include <infiniband/verbs.h>

       struct ibv_qp *ibv_create_qp_ex(struct ibv_context *context,
                                       struct ibv_qp_init_attr_ex *qp_init_attr);

       int ibv_destroy_qp(struct ibv_qp *qp);

DESCRIPTION         top

       ibv_create_qp_ex() creates a queue pair (QP) associated with the
       protection domain pd.  The argument qp_init_attr_ex is an
       ibv_qp_init_attr_ex struct, as defined in <infiniband/verbs.h>.

       struct ibv_qp_init_attr_ex {
               void                   *qp_context;     /* Associated context of the QP */
               struct ibv_cq          *send_cq;        /* CQ to be associated with the Send Queue (SQ) */
               struct ibv_cq          *recv_cq;        /* CQ to be associated with the Receive Queue (RQ) */
               struct ibv_srq         *srq;            /* SRQ handle if QP is to be associated with an SRQ, otherwise NULL */
               struct ibv_qp_cap       cap;            /* QP capabilities */
               enum ibv_qp_type        qp_type;        /* QP Transport Service Type: IBV_QPT_RC, IBV_QPT_UC, IBV_QPT_UD, IBV_QPT_RAW_PACKET or IBV_QPT_DRIVER */
               int                     sq_sig_all;     /* If set, each Work Request (WR) submitted to the SQ generates a completion entry */
               uint32_t                comp_mask; /* Identifies valid fields */
               struct ibv_pd          *pd;        /* PD to be associated with the QP */
               struct ibv_xrcd        *xrcd;      /* XRC domain to be associated with the target QP */
               enum ibv_qp_create_flags create_flags;  /* Creation flags for this QP */
               uint16_t                max_tso_header; /* Maximum TSO header size */
               struct ibv_rwq_ind_table *rwq_ind_tbl;  /* Indirection table to be associated with the QP */
               struct ibv_rx_hash_conf  rx_hash_conf;  /* RX hash configuration to be used */
               uint32_t                source_qpn;     /* Source QP number, creation flag IBV_QP_CREATE_SOURCE_QPN should be set, few NOTEs below */
               uint64_t                send_ops_flags; /* Select which QP send ops will be defined in struct ibv_qp_ex. Use enum ibv_qp_create_send_ops_flags */
       };

       struct ibv_qp_cap {
               uint32_t                max_send_wr;    /* Requested max number of outstanding WRs in the SQ */
               uint32_t                max_recv_wr;    /* Requested max number of outstanding WRs in the RQ */
               uint32_t                max_send_sge;   /* Requested max number of scatter/gather (s/g) elements in a WR in the SQ */
               uint32_t                max_recv_sge;   /* Requested max number of s/g elements in a WR in the RQ */
               uint32_t                max_inline_data;/* Requested max number of data (bytes) that can be posted inline to the SQ, otherwise 0 */
       };
       enum ibv_qp_create_flags {
               IBV_QP_CREATE_BLOCK_SELF_MCAST_LB       = 1 << 1, /* Prevent self multicast loopback */
               IBV_QP_CREATE_SCATTER_FCS               = 1 << 8, /* FCS field will be scattered to host memory */
               IBV_QP_CREATE_CVLAN_STRIPPING           = 1 << 9, /* CVLAN field will be stripped from incoming packets */
               IBV_QP_CREATE_SOURCE_QPN                = 1 << 10, /* The created QP will use the source_qpn as its wire QP number */
               IBV_QP_CREATE_PCI_WRITE_END_PADDING     = 1 << 11, /* Incoming packets will be padded to cacheline size */
       };
       struct ibv_rx_hash_conf {
               uint8_t                rx_hash_function;       /* RX hash function, use enum ibv_rx_hash_function_flags */
               uint8_t                rx_hash_key_len;        /* RX hash key length */
               uint8_t                *rx_hash_key;           /* RX hash key data */
               uint64_t               rx_hash_fields_mask;    /* RX fields that should participate in the hashing, use enum ibv_rx_hash_fields */
       };
       enum ibv_rx_hash_fields {
               IBV_RX_HASH_SRC_IPV4            = 1 << 0,
               IBV_RX_HASH_DST_IPV4            = 1 << 1,
               IBV_RX_HASH_SRC_IPV6            = 1 << 2,
               IBV_RX_HASH_DST_IPV6            = 1 << 3,
               IBV_RX_HASH_SRC_PORT_TCP        = 1 << 4,
               IBV_RX_HASH_DST_PORT_TCP        = 1 << 5,
               IBV_RX_HASH_SRC_PORT_UDP        = 1 << 6,
               IBV_RX_HASH_DST_PORT_UDP        = 1 << 7,
               IBV_RX_HASH_IPSEC_SPI           = 1 << 8,
               /* When using tunneling protocol, e.g. VXLAN, then we have an inner (encapsulated packet) and outer.
                * For applying RSS on the inner packet, then the following field should be set with one of the L3/L4 fields.
               */
               IBV_RX_HASH_INNER        = (1UL << 31),
       };
       struct ibv_qp_create_send_ops_flags {
               IBV_QP_EX_WITH_RDMA_WRITE          = 1 << 0,
               IBV_QP_EX_WITH_RDMA_WRITE_WITH_IMM = 1 << 1,
               IBV_QP_EX_WITH_SEND           = 1 << 2,
               IBV_QP_EX_WITH_SEND_WITH_IMM       = 1 << 3,
               IBV_QP_EX_WITH_RDMA_READ      = 1 << 4,
               IBV_QP_EX_WITH_ATOMIC_CMP_AND_SWP  = 1 << 5,
               IBV_QP_EX_WITH_ATOMIC_FETCH_AND_ADD     = 1 << 6,
               IBV_QP_EX_WITH_LOCAL_INV      = 1 << 7,
               IBV_QP_EX_WITH_BIND_MW             = 1 << 8,
               IBV_QP_EX_WITH_SEND_WITH_INV       = 1 << 9,
               IBV_QP_EX_WITH_TSO            = 1 << 10,
       };

       The function ibv_create_qp_ex() will update the
       qp_init_attr_ex->cap struct with the actual QP values of the QP
       that was created; the values will be greater than or equal to the
       values requested.

       ibv_destroy_qp() destroys the QP qp.

RETURN VALUE         top

       ibv_create_qp_ex() returns a pointer to the created QP, or NULL
       if the request fails.  Check the QP number (qp_num) in the
       returned QP.

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

NOTES         top

       The attributes max_recv_wr and max_recv_sge are ignored by
       ibv_create_qp_ex() if the QP is to be associated with an SRQ.

       The attribute source_qpn is supported only on UD QP, without flow
       steering RX should not be possible.

       Use ibv_qp_to_qp_ex() to get the ibv_qp_ex for accessing the send
       ops iterator interface, when QP create attr
       IBV_QP_INIT_ATTR_SEND_OPS_FLAGS is used.

       ibv_destroy_qp() fails if the QP is attached to a multicast
       group.

       IBV_QPT_DRIVER does not represent a specific service and is used
       for vendor specific QP logic.

SEE ALSO         top

       ibv_alloc_pd(3), ibv_modify_qp(3), ibv_query_qp(3),
       ibv_create_rwq_ind_table(3)

AUTHORS         top

       Yishai Hadas <yishaih@mellanox.com>

COLOPHON         top

       This page is part of the rdma-core (RDMA Core Userspace Libraries
       and Daemons) project.  Information about the project can be found
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       report for this manual page, send it to
       linux-rdma@vger.kernel.org.  This page was obtained from the
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       ⟨https://github.com/linux-rdma/rdma-core.git⟩ on 2024-06-14.  (At
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libibverbs                     2013-06-26            IBV_CREATE_QP_EX(3)

Pages that refer to this page: ibv_create_rwq_ind_table(3)ibv_open_qp(3)ibv_open_xrcd(3)