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| author | Matan Barak <matanb@mellanox.com> | 2016-06-01 16:05:38 +0300 |
|---|---|---|
| committer | Doug Ledford <dledford@redhat.com> | 2016-06-04 22:30:19 -0400 |
| commit | 169a6efad9e5c50b87e2820740ecfda63878f7ca (patch) | |
| tree | 9648d8df6bc8ad564dc088e7fe1ac997d892bc3d | |
| parent | c2e36f6797f4466b8cea1df53db11c5c23bd3b2a (diff) | |
| download | libibverbs-169a6efad9e5c50b87e2820740ecfda63878f7ca.tar.gz | |
Create a single threaded CQ
When a CQ is used only from one thread, there's no need to waste cycles
on locking. Since this series introduces a mechanism which allows the
vendor to introduce different polling functions per CQ, it allows the
vendor to implement both locking and lockless CQs and assign them
accordingly.
Adding a new creation flag for this.
Signed-off-by: Matan Barak <matanb@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
| -rw-r--r-- | include/infiniband/verbs.h | 12 | ||||
| -rw-r--r-- | man/ibv_create_cq_ex.3 | 8 | ||||
| -rw-r--r-- | src/cmd.c | 4 |
3 files changed, 23 insertions, 1 deletions
diff --git a/include/infiniband/verbs.h b/include/infiniband/verbs.h index cc9ad4a..d4b48c0 100644 --- a/include/infiniband/verbs.h +++ b/include/infiniband/verbs.h @@ -1185,7 +1185,13 @@ struct ibv_context { }; enum ibv_cq_init_attr_mask { - IBV_CQ_INIT_ATTR_MASK_RESERVED = 0 << 1 + IBV_CQ_INIT_ATTR_MASK_FLAGS = 1 << 0, + IBV_CQ_INIT_ATTR_MASK_RESERVED = 1 << 1 +}; + +enum ibv_create_cq_attr_flags { + IBV_CREATE_CQ_ATTR_SINGLE_THREADED = 1 << 0, + IBV_CREATE_CQ_ATTR_RESERVED = 1 << 1, }; struct ibv_cq_init_attr_ex { @@ -1207,6 +1213,10 @@ struct ibv_cq_init_attr_ex { * enum ibv_cq_init_attr_mask */ uint32_t comp_mask; + /* create cq attr flags - one or more flags from + * enum ibv_create_cq_attr_flags + */ + uint32_t flags; }; enum verbs_context_mask { diff --git a/man/ibv_create_cq_ex.3 b/man/ibv_create_cq_ex.3 index b6cc6f6..ecaeb0a 100644 --- a/man/ibv_create_cq_ex.3 +++ b/man/ibv_create_cq_ex.3 @@ -41,6 +41,14 @@ enum ibv_wc_flags_ex { IBV_WC_EX_WITH_COMPLETION_TIMESTAMP = 1 << 7, /* Require completion timestamp in WC /* }; +enum ibv_cq_init_attr_mask { + IBV_CQ_INIT_ATTR_MASK_FLAGS = 1 << 0, +}; + +enum ibv_create_cq_attr_flags { + IBV_CREATE_CQ_ATTR_SINGLE_THREADED = 1 << 0, /* This CQ is used from a single threaded, thus no locking is required */ +}; + .SH "Polling an extended CQ" In order to poll an extended CQ efficiently, a user could use the following functions. @@ -486,6 +486,10 @@ int ibv_cmd_create_cq_ex(struct ibv_context *context, if (cmd_core_size >= offsetof(struct ibv_create_cq_ex, flags) + sizeof(cmd->flags)) { + if ((cq_attr->comp_mask & IBV_CQ_INIT_ATTR_MASK_FLAGS) && + (cq_attr->flags & ~(IBV_CREATE_CQ_ATTR_RESERVED - 1))) + return EOPNOTSUPP; + if (cq_attr->wc_flags & IBV_WC_EX_WITH_COMPLETION_TIMESTAMP) cmd->flags |= IBV_CREATE_CQ_EX_KERNEL_FLAG_COMPLETION_TIMESTAMP; } |