[ofa-general] RFC: SRC API
Michael S. Tsirkin
mst at dev.mellanox.co.il
Sun Jul 29 07:04:31 PDT 2007
Hello!
Here is an API proposal for support of the SRC
(scalable reliable connected) protocol extension in libibverbs.
This adds APIs to:
- manage SRC domains
- share SRC domains between processes,
by means of creating a 1:1 association
between an SRC domain and a file.
Notes:
- The file is specified by means of a file descriptor,
this makes it possible for the user to manage file
creation/deletion in the most flexible manner
(e.g. tmpfile can be used).
- I envision implementing this sharing mechanism in kernel by means
of a per-device tree, with inode as a key and domain object
as a value.
Please comment.
Signed-off-by: Michael S. Tsirkin <mst at dev.mellanox.co.il>
---
diff --git a/include/infiniband/verbs.h b/include/infiniband/verbs.h
index acc1b82..503f201 100644
--- a/include/infiniband/verbs.h
+++ b/include/infiniband/verbs.h
@@ -370,6 +370,11 @@ struct ibv_ah_attr {
uint8_t port_num;
};
+struct ibv_src_domain {
+ struct ibv_context *context;
+ uint32_t handle;
+};
+
enum ibv_srq_attr_mask {
IBV_SRQ_MAX_WR = 1 << 0,
IBV_SRQ_LIMIT = 1 << 1
@@ -389,7 +394,8 @@ struct ibv_srq_init_attr {
enum ibv_qp_type {
IBV_QPT_RC = 2,
IBV_QPT_UC,
- IBV_QPT_UD
+ IBV_QPT_UD,
+ IBV_QPT_SRC
};
struct ibv_qp_cap {
@@ -408,6 +414,7 @@ struct ibv_qp_init_attr {
struct ibv_qp_cap cap;
enum ibv_qp_type qp_type;
int sq_sig_all;
+ struct ibv_src_domain *src_domain;
};
enum ibv_qp_attr_mask {
@@ -526,6 +533,7 @@ struct ibv_send_wr {
uint32_t remote_qkey;
} ud;
} wr;
+ uint32_t src_remote_srq_num;
};
struct ibv_recv_wr {
@@ -553,6 +561,10 @@ struct ibv_srq {
pthread_mutex_t mutex;
pthread_cond_t cond;
uint32_t events_completed;
+
+ uint32_t src_srq_num;
+ struct ibv_src_domain *src_domain;
+ struct ibv_cq *src_cq;
};
struct ibv_qp {
@@ -570,6 +582,8 @@ struct ibv_qp {
pthread_mutex_t mutex;
pthread_cond_t cond;
uint32_t events_completed;
+
+ struct ibv_src_domain *src_domain;
};
struct ibv_comp_channel {
@@ -912,6 +926,25 @@ struct ibv_srq *ibv_create_srq(struct ibv_pd *pd,
struct ibv_srq_init_attr *srq_init_attr);
/**
+ * ibv_create_src_srq - Creates a SRQ associated with the specified protection
+ * domain and src domain.
+ * @pd: The protection domain associated with the SRQ.
+ * @src_domain: The SRC domain associated with the SRQ.
+ * @src_cq: CQ to report completions for SRC packets on.
+ *
+ * @srq_init_attr: A list of initial attributes required to create the SRQ.
+ *
+ * srq_attr->max_wr and srq_attr->max_sge are read the determine the
+ * requested size of the SRQ, and set to the actual values allocated
+ * on return. If ibv_create_srq() succeeds, then max_wr and max_sge
+ * will always be at least as large as the requested values.
+ */
+struct ibv_srq *ibv_create_src_srq(struct ibv_pd *pd,
+ struct ibv_src_domain *src_domain,
+ struct ibv_cq *src_cq,
+ struct ibv_srq_init_attr *srq_init_attr);
+
+/**
* ibv_modify_srq - Modifies the attributes for the specified SRQ.
* @srq: The SRQ to modify.
* @srq_attr: On input, specifies the SRQ attributes to modify. On output,
@@ -1074,6 +1107,44 @@ int ibv_detach_mcast(struct ibv_qp *qp, union ibv_gid *gid, uint16_t lid);
*/
int ibv_fork_init(void);
+/**
+ * ibv_alloc_src_domain - Allocate an SRC domain
+ * Returns a reference to an SRC domain.
+ * Use ibv_put_src_domain to free the reference.
+ * @context: Device context
+ */
+struct ibv_src_domain *ibv_get_new_src_domain(struct ibv_context *context);
+
+/**
+ * ibv_share_src_domain - associate the src domain with a file.
+ * Establishes a connection between an SRC domain object and a file descriptor.
+ *
+ * @d: SRC domain to share
+ * @fd: descriptor for a file to associate with the domain
+ */
+int ibv_share_src_domain(struct ibv_src_domain *d, int fd);
+
+/**
+ * ibv_unshare_src_domain - disassociate the src domain from a file.
+ * Subsequent calls to ibv_get_shared_src_domain will fail.
+ * @d: SRC domain to unshare
+ */
+int ibv_unshare_src_domain(struct ibv_src_domain *d);
+
+/**
+ * ibv_get_src_domain - get a reference to shared SRC domain
+ * @context: Device context
+ * @fd: descriptor for a file associated with the domain
+ */
+struct ibv_src_domain *ibv_get_shared_src_domain(struct ibv_context *context, int fd);
+
+/**
+ * ibv_put_src_domain - destroy a reference to an SRC domain
+ * If this is the last reference, destroys the domain.
+ * @d: reference to SRC domain to put
+ */
+int ibv_put_src_domain(struct ibv_src_domain *d);
+
END_C_DECLS
# undef __attribute_const
--
MST
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