From: Leon Romanovsky <leo...@mellanox.com>
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 <sa...@mellanox.com>
Signed-off-by: Leon Romanovsky <leo...@mellanox.com>
---
drivers/infiniband/core/uverbs_cmd.c | 5 ++++-
include/rdma/ib_verbs.h | 11 +++++++++++
2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/drivers/infiniband/core/uverbs_cmd.c
b/drivers/infiniband/core/uverbs_cmd.c
index 94816ae..0e9711f 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -1843,7 +1843,10 @@ static int create_qp(struct ib_uverbs_file *file,
sizeof(cmd->create_flags))
attr.create_flags = cmd->create_flags;
- if (attr.create_flags & ~IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK) {
+ if (attr.create_flags & ~(IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK |
+ IB_QP_CREATE_CROSS_CHANNEL |
+ IB_QP_CREATE_MANAGED_SEND |
+ IB_QP_CREATE_MANAGED_RECV)) {
ret = -EINVAL;
goto err_put;
}
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index bcf40ad..370fbdf 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -139,6 +139,13 @@ 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),
@@ -184,6 +191,7 @@ 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 {
@@ -866,6 +874,9 @@ 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,
--
1.7.12.4
--
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