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authorLeon Romanovsky <leonro@mellanox.com>2015-12-20 12:16:10 +0200
committerDoug Ledford <dledford@redhat.com>2015-12-23 23:33:14 -0500
commit8a06ce59a4cd034c52c59c44ff6b0785a3969409 (patch)
tree6b42a1d753696101ea2de9d96e3b95119db076e4 /include/rdma
parent7ca0bc53652382529b1cc1c39987cf93084d5828 (diff)
IB/core: Add cross-channel support
The cross-channel feature allows to execute WQEs that involve synchronization of I/O operations’ on different QPs. This capability enables to program complex flows with a single function call, hereby significantly reducing overhead associated with I/O processing. Cross-channel operations support is indicated by HCA capability information. The queue pairs can be configured to work as a “sync master queue” or “sync slave queues”. The added flags are: 1. Device capability flag IB_DEVICE_CROSS_CHANNEL for the devices that can perform cross-channel operations. 2. CQ property flag IB_CQ_FLAGS_IGNORE_OVERRUN to disable CQ overrun check. This check is useless in cross-channel scenario. 3. QP property flags to indicate if queues are slave or master: * IB_QP_CREATE_MANAGED_SEND indicates that posted send work requests will not be executed immediately and requires enabling. * IB_QP_CREATE_MANAGED_RECV indicates that posted receive work requests will not be executed immediately and requires enabling. * IB_QP_CREATE_CROSS_CHANNEL declares the QP to work in cross-channel mode. If IB_QP_CREATE_MANAGED_SEND and IB_QP_CREATE_MANAGED_RECV are not provided, this QP will be sync master queue, else it will be sync slave. Reviewed-by: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'include/rdma')
-rw-r--r--include/rdma/ib_verbs.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 862b8a07c028..75fcc97886de 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -201,6 +201,13 @@ enum ib_device_cap_flags {
IB_DEVICE_MEM_WINDOW_TYPE_2B = (1 << 24),
IB_DEVICE_RC_IP_CSUM = (1 << 25),
IB_DEVICE_RAW_IP_CSUM = (1 << 26),
+ /*
+ * Devices should set IB_DEVICE_CROSS_CHANNEL if they
+ * support execution of WQEs that involve synchronization
+ * of I/O operations with single completion queue managed
+ * by hardware.
+ */
+ IB_DEVICE_CROSS_CHANNEL = (1 << 27),
IB_DEVICE_MANAGED_FLOW_STEERING = (1 << 29),
IB_DEVICE_SIGNATURE_HANDOVER = (1 << 30),
IB_DEVICE_ON_DEMAND_PAGING = (1 << 31),
@@ -246,6 +253,7 @@ struct ib_odp_caps {
enum ib_cq_creation_flags {
IB_CQ_FLAGS_TIMESTAMP_COMPLETION = 1 << 0,
+ IB_CQ_FLAGS_IGNORE_OVERRUN = 1 << 1,
};
struct ib_cq_init_attr {
@@ -950,6 +958,9 @@ enum ib_qp_type {
enum ib_qp_create_flags {
IB_QP_CREATE_IPOIB_UD_LSO = 1 << 0,
IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK = 1 << 1,
+ IB_QP_CREATE_CROSS_CHANNEL = 1 << 2,
+ IB_QP_CREATE_MANAGED_SEND = 1 << 3,
+ IB_QP_CREATE_MANAGED_RECV = 1 << 4,
IB_QP_CREATE_NETIF_QP = 1 << 5,
IB_QP_CREATE_SIGNATURE_EN = 1 << 6,
IB_QP_CREATE_USE_GFP_NOIO = 1 << 7,