prov/efa: Use tclass to prioritize the messages from an ep

To prioritize the messages from a given endpoint, user can specify `
fi_info->tx_attr->tclass = FI_TC_LOW_LATENCY` in the fi_endpoint()
call to set the service level in rdma-core. All other tclass values
will be ignored.

Signed-off-by: Jessie Yang <[email protected]>

Author: jiaxiyan

man/fi_efa.7.md

@@ -205,6 +205,8 @@ struct fi_efa_mr_attr {
 **query_mr()** returns 0 on success, or the value of errno on failure
 (which indicates the failure reason).
 
+# Traffic Class (tclass) in EFA
+To prioritize the messages from a given endpoint, user can specify `fi_info->tx_attr->tclass = FI_TC_LOW_LATENCY` in the fi_endpoint() call to set the service level in rdma-core. All other tclass values will be ignored.
 
 # RUNTIME PARAMETERS
 

prov/efa/configure.m4

@@ -77,6 +77,7 @@ AC_DEFUN([FI_EFA_CONFIGURE],[
 	efadv_support_extended_cq=0
 	have_efa_dmabuf_mr=0
 	have_efadv_query_mr=0
+	have_efadv_sl=0
 
 	dnl $have_neuron is defined at top-level configure.ac
 	AM_CONDITIONAL([HAVE_NEURON], [ test x"$have_neuron" = x1 ])
@@ -159,6 +160,11 @@ AC_DEFUN([FI_EFA_CONFIGURE],[
 			[],
 			[have_efadv_query_mr=0],
 			[[#include <infiniband/efadv.h>]])
+
+		AC_CHECK_MEMBER(struct efadv_qp_init_attr.sl,
+			[have_efadv_sl=1],
+			[have_efadv_sl=0],
+			[[#include <infiniband/efadv.h>]])
 	])
 
 	AC_DEFINE_UNQUOTED([HAVE_RDMA_SIZE],
@@ -188,6 +194,9 @@ AC_DEFUN([FI_EFA_CONFIGURE],[
 	AC_DEFINE_UNQUOTED([HAVE_EFADV_QUERY_MR],
 		[$have_efadv_query_mr],
 		[Indicates if efadv_query_mr verbs is available])
+	AC_DEFINE_UNQUOTED([HAVE_EFADV_SL],
+		[$have_efadv_sl],
+		[Indicates if efadv_qp_init_attr has sl])
 
 
 	CPPFLAGS=$save_CPPFLAGS

prov/efa/src/efa_base_ep.c

@@ -167,7 +167,7 @@ static int efa_base_ep_modify_qp_rst2rts(struct efa_base_ep *base_ep,
  * @param init_attr_ex ibv_qp_init_attr_ex
  * @return int 0 on success, negative integer on failure
  */
-int efa_qp_create(struct efa_qp **qp, struct ibv_qp_init_attr_ex *init_attr_ex)
+int efa_qp_create(struct efa_qp **qp, struct ibv_qp_init_attr_ex *init_attr_ex, uint32_t tclass)
 {
 	struct efadv_qp_init_attr efa_attr = { 0 };
 
@@ -185,6 +185,12 @@ int efa_qp_create(struct efa_qp **qp, struct ibv_qp_init_attr_ex *init_attr_ex)
 			efa_attr.flags |= EFADV_QP_FLAGS_UNSOLICITED_WRITE_RECV;
 #endif
 		efa_attr.driver_qp_type = EFADV_QP_DRIVER_TYPE_SRD;
+#if HAVE_EFADV_SL
+		if (tclass == FI_TC_LOW_LATENCY) {
+			efa_attr.sl = SL_8;
+		}
+
+#endif
 		(*qp)->ibv_qp = efadv_create_qp_ex(
 			init_attr_ex->pd->context, init_attr_ex, &efa_attr,
 			sizeof(struct efadv_qp_init_attr));
@@ -206,7 +212,7 @@ int efa_base_ep_create_qp(struct efa_base_ep *base_ep,
 {
 	int ret;
 
-	ret = efa_qp_create(&base_ep->qp, init_attr_ex);
+	ret = efa_qp_create(&base_ep->qp, init_attr_ex, base_ep->info->tx_attr->tclass);
 	if (ret)
 		return ret;
 

prov/efa/src/efa_base_ep.h

@@ -12,6 +12,13 @@
 #include "ofi_util.h"
 #include "rdm/efa_rdm_protocol.h"
 
+#if HAVE_EFADV_SL
+enum efa_qp_service_level {
+    SL_0 = 0,
+    SL_8 = 8,
+};
+#endif
+
 struct efa_qp {
 	struct ibv_qp *ibv_qp;
 	struct ibv_qp_ex *ibv_qp_ex;
@@ -72,7 +79,7 @@ int efa_base_ep_construct(struct efa_base_ep *base_ep,
 
 int efa_base_ep_getname(fid_t fid, void *addr, size_t *addrlen);
 
-int efa_qp_create(struct efa_qp **qp, struct ibv_qp_init_attr_ex *init_attr_ex);
+int efa_qp_create(struct efa_qp **qp, struct ibv_qp_init_attr_ex *init_attr_ex, uint32_t tclass);
 
 void efa_qp_destruct(struct efa_qp *qp);
 

prov/efa/src/rdm/efa_rdm_ep_fiops.c

@@ -105,7 +105,7 @@ int efa_rdm_ep_create_base_ep_ibv_qp(struct efa_rdm_ep *ep)
 	 * without any headers.
 	 */
 	if (ep->use_zcpy_rx) {
-		ret = efa_qp_create(&ep->base_ep.user_recv_qp, &attr_ex);
+		ret = efa_qp_create(&ep->base_ep.user_recv_qp, &attr_ex, ep->base_ep.info->tx_attr->tclass);
 		if (ret) {
 			efa_base_ep_destruct_qp(&ep->base_ep);
 			return ret;
@@ -1646,7 +1646,7 @@ int efa_rdm_ep_check_qp_in_order_aligned_128_bytes(struct efa_rdm_ep *ep,
 	/* Create a dummy qp for query only */
 	efa_rdm_ep_construct_ibv_qp_init_attr_ex(ep, &attr_ex, ibv_cq_ex, ibv_cq_ex);
 
-	ret = efa_qp_create(&qp, &attr_ex);
+	ret = efa_qp_create(&qp, &attr_ex, FI_TC_UNSPEC);
 	if (ret)
 		goto out;