1IBV_CREATE_QP_EX(3)     Libibverbs Programmer's Manual     IBV_CREATE_QP_EX(3)
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NAME

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

9       #include <infiniband/verbs.h>
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11       struct ibv_qp *ibv_create_qp_ex(struct ibv_context *context,
12                                       struct ibv_qp_init_attr_ex *qp_init_attr);
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14       int ibv_destroy_qp(struct ibv_qp *qp);
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DESCRIPTION

17       ibv_create_qp_ex()  creates  a queue pair (QP) associated with the pro‐
18       tection   domain   pd.    The   argument    qp_init_attr_ex    is    an
19       ibv_qp_init_attr_ex struct, as defined in <infiniband/verbs.h>.
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21       struct ibv_qp_init_attr_ex {
22               void                   *qp_context;     /* Associated context of the QP */
23               struct ibv_cq          *send_cq;        /* CQ to be associated with the Send Queue (SQ) */
24               struct ibv_cq          *recv_cq;        /* CQ to be associated with the Receive Queue (RQ) */
25               struct ibv_srq         *srq;            /* SRQ handle if QP is to be associated with an SRQ, otherwise NULL */
26               struct ibv_qp_cap       cap;            /* QP capabilities */
27               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 */
28               int                     sq_sig_all;     /* If set, each Work Request (WR) submitted to the SQ generates a completion entry */
29               uint32_t                comp_mask; /* Identifies valid fields */
30               struct ibv_pd          *pd;        /* PD to be associated with the QP */
31               struct ibv_xrcd        *xrcd;      /* XRC domain to be associated with the target QP */
32               enum ibv_qp_create_flags create_flags;  /* Creation flags for this QP */
33               uint16_t                max_tso_header; /* Maximum TSO header size */
34               struct ibv_rwq_ind_table *rwq_ind_tbl;  /* Indirection table to be associated with the QP */
35               struct ibv_rx_hash_conf  rx_hash_conf;  /* RX hash configuration to be used */
36               uint32_t                source_qpn;     /* Source QP number, creation flag IBV_QP_CREATE_SOURCE_QPN should be set, few NOTEs below */
37       };
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39       struct ibv_qp_cap {
40               uint32_t                max_send_wr;    /* Requested max number of outstanding WRs in the SQ */
41               uint32_t                max_recv_wr;    /* Requested max number of outstanding WRs in the RQ */
42               uint32_t                max_send_sge;   /* Requested max number of scatter/gather (s/g) elements in a WR in the SQ */
43               uint32_t                max_recv_sge;   /* Requested max number of s/g elements in a WR in the SQ */
44               uint32_t                max_inline_data;/* Requested max number of data (bytes) that can be posted inline to the SQ, otherwise 0 */
45       };
46       enum ibv_qp_create_flags {
47               IBV_QP_CREATE_BLOCK_SELF_MCAST_LB       = 1 << 1, /* Prevent self multicast loopback */
48               IBV_QP_CREATE_SCATTER_FCS               = 1 << 8, /* FCS field will be scattered to host memory */
49               IBV_QP_CREATE_CVLAN_STRIPPING           = 1 << 9, /* CVLAN field will be stripped from incoming packets */
50               IBV_QP_CREATE_SOURCE_QPN                = 1 << 10, /* The created QP will use the source_qpn as its wire QP number */
51               IBV_QP_CREATE_PCI_WRITE_END_PADDING     = 1 << 11, /* Incoming packets will be padded to cacheline size */
52       };
53       struct ibv_rx_hash_conf {
54               uint8_t                rx_hash_function;       /* RX hash function, use enum ibv_rx_hash_function_flags */
55               uint8_t                rx_hash_key_len;        /* RX hash key length */
56               uint8_t                *rx_hash_key;           /* RX hash key data */
57               uint64_t               rx_hash_fields_mask;    /* RX fields that should participate in the hashing, use enum ibv_rx_hash_fields */
58       };
59
60       enum ibv_rx_hash_fields {
61               IBV_RX_HASH_SRC_IPV4            = 1 << 0,
62               IBV_RX_HASH_DST_IPV4            = 1 << 1,
63               IBV_RX_HASH_SRC_IPV6            = 1 << 2,
64               IBV_RX_HASH_DST_IPV6            = 1 << 3,
65               IBV_RX_HASH_SRC_PORT_TCP        = 1 << 4,
66               IBV_RX_HASH_DST_PORT_TCP        = 1 << 5,
67               IBV_RX_HASH_SRC_PORT_UDP        = 1 << 6,
68               IBV_RX_HASH_DST_PORT_UDP        = 1 << 7,
69               /* When using tunneling protocol, e.g. VXLAN, then we have an inner (encapsulated packet) and outer.
70                * For applying RSS on the inner packet, then the following field should be set with one of the L3/L4 fields.
71               */
72               IBV_RX_HASH_INNER        = (1UL << 31),
73       };
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76       The  function  ibv_create_qp_ex()  will update the qp_init_attr_ex->cap
77       struct with the actual QP values of the QP that was created; the values
78       will be greater than or equal to the values requested.
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80       ibv_destroy_qp() destroys the QP qp.
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RETURN VALUE

83       ibv_create_qp_ex()  returns a pointer to the created QP, or NULL if the
84       request fails.  Check the QP number (qp_num) in the returned QP.
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86       ibv_destroy_qp() returns 0 on success, or the value of errno on failure
87       (which indicates the failure reason).
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NOTES

90       The  attributes  max_recv_wr  and  max_recv_sge are ignored by ibv_cre‐
91       ate_qp_ex() if the QP is to be associated with an SRQ.
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93       The attribute source_qpn is supported  only  on  UD  QP,  without  flow
94       steering RX should not be possible.
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96       ibv_destroy_qp() fails if the QP is attached to a multicast group.
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98       IBV_QPT_DRIVER  does  not  represent a specific service and is used for
99       vendor specific QP logic.
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SEE ALSO

102       ibv_alloc_pd(3),    ibv_modify_qp(3),     ibv_query_qp(3),     ibv_cre‐
103       ate_rwq_ind_table(3)
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AUTHORS

106       Yishai Hadas <yishaih@mellanox.com>
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110libibverbs                        2013-06-26               IBV_CREATE_QP_EX(3)
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