[PATCH libibverbs 2/3] libibverbs: Add cross-channel QP initialization flags

[Leon Romanovsky]

From: Leon Romanovsky 

The cross-channel feature allows to execute WQEs that involve
synchronization of I/O operations' on different QPs.

These QPs should be configured to work as a "sync master queue" or
“sync slave queues”.

The 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.

Signed-off-by: Leon Romanovsky 
---
 include/infiniband/verbs.h | 3 +++
 src/cmd.c  | 5 -
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/infiniband/verbs.h b/include/infiniband/verbs.h
index d8069d52ae13..2b9b50c87f45 100644
--- a/include/infiniband/verbs.h
+++ b/include/infiniband/verbs.h
@@ -769,6 +769,9 @@ enum ibv_qp_init_attr_mask {
 
 enum ibv_qp_create_flags {
IBV_QP_CREATE_BLOCK_SELF_MCAST_LB   = 1 << 1,
+   IBV_QP_CREATE_CROSS_CHANNEL = 1 << 2,
+   IBV_QP_CREATE_MANAGED_SEND  = 1 << 3,
+   IBV_QP_CREATE_MANAGED_RECV  = 1 << 4
 };
 
 struct ibv_qp_init_attr_ex {
diff --git a/src/cmd.c b/src/cmd.c
index 675777a8ee5a..ae33491befb4 100644
--- a/src/cmd.c
+++ b/src/cmd.c
@@ -815,7 +815,10 @@ static void create_qp_handle_resp_common(struct 
ibv_context *context,
 }
 
 enum {
-   CREATE_QP_EX2_SUP_CREATE_FLAGS = IBV_QP_CREATE_BLOCK_SELF_MCAST_LB,
+   CREATE_QP_EX2_SUP_CREATE_FLAGS = IBV_QP_CREATE_BLOCK_SELF_MCAST_LB |
+   IBV_QP_CREATE_CROSS_CHANNEL |
+   IBV_QP_CREATE_MANAGED_SEND |
+   IBV_QP_CREATE_MANAGED_RECV
 };
 
 int ibv_cmd_create_qp_ex2(struct ibv_context *context,
-- 
1.7.12.4

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Re: [PATCH libibverbs 2/3] libibverbs: Add cross-channel QP initialization flags

[Or Gerlitz]

On 12/20/2015 1:22 PM, Leon Romanovsky wrote:

---
  include/infiniband/verbs.h | 3 +++
  src/cmd.c  | 5 -
  2 files changed, 7 insertions(+), 1 deletion(-)


You need to document the new creation flags in a man page. If this 
doesn't exist, this should be added to Eran's submission and you will 
enhance that.


Or.
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