# ibv_create_qp_ex

## NAME



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


## SYNOPSIS



           **#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



           **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



           **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



           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.
    


* * *