IB/hfi1: Add support for 16B Management Packets

16B Management Packets (L4=0x08) replace the BTH and DETH
of normal MAD packet packets with a header containing the
the source and destination queue pair numbers; fields that
were originally retrieved from the BTH/DETH are now populated
from this header as well as from the 16B LRH (e.g. pkey).

16B Management Packets are used as an optimized management
format on 16B fabrics.

These management packets have an opcode of IB_OPCODE_UD_SEND_ONLY,
a fixed 3Byte pad, and a header length of 24Bytes.

The decision as to when we send a management packet is based
upon either the source or destination queue pair number being
0 or 1.

Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Don Hiatt <don.hiatt@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/hfi1/hfi.h b/drivers/infiniband/hw/hfi1/hfi.h
index 531ac89c8213..f49cd80df557 100644
--- a/drivers/infiniband/hw/hfi1/hfi.h
+++ b/drivers/infiniband/hw/hfi1/hfi.h
@@ -333,6 +333,7 @@ struct hfi1_packet {
 	struct rvt_qp *qp;
 	struct ib_other_headers *ohdr;
 	struct ib_grh *grh;
+	struct opa_16b_mgmt *mgmt;
 	u64 rhf;
 	u32 maxcnt;
 	u32 rhqoff;
@@ -397,6 +398,12 @@ struct hfi1_packet {
 #define OPA_16B_L4_IB_GLOBAL	0x0A
 #define OPA_16B_L4_ETHR		OPA_VNIC_L4_ETHR
 
+/*
+ * OPA 16B Management
+ */
+#define OPA_16B_L4_FM_PAD	3  /* fixed 3B pad */
+#define OPA_16B_L4_FM_HLEN	24 /* 16B(16) + L4_FM(8) */
+
 static inline u8 hfi1_16B_get_l4(struct hfi1_16b_header *hdr)
 {
 	return (u8)(hdr->lrh[2] & OPA_16B_L4_MASK);
@@ -473,6 +480,27 @@ static inline u8 hfi1_16B_bth_get_pad(struct ib_other_headers *ohdr)
 		   OPA_16B_BTH_PAD_MASK);
 }
 
+/*
+ * 16B Management
+ */
+#define OPA_16B_MGMT_QPN_MASK	0xFFFFFF
+static inline u32 hfi1_16B_get_dest_qpn(struct opa_16b_mgmt *mgmt)
+{
+	return be32_to_cpu(mgmt->dest_qpn) & OPA_16B_MGMT_QPN_MASK;
+}
+
+static inline u32 hfi1_16B_get_src_qpn(struct opa_16b_mgmt *mgmt)
+{
+	return be32_to_cpu(mgmt->src_qpn) & OPA_16B_MGMT_QPN_MASK;
+}
+
+static inline void hfi1_16B_set_qpn(struct opa_16b_mgmt *mgmt,
+				    u32 dest_qp, u32 src_qp)
+{
+	mgmt->dest_qpn = cpu_to_be32(dest_qp & OPA_16B_MGMT_QPN_MASK);
+	mgmt->src_qpn = cpu_to_be32(src_qp & OPA_16B_MGMT_QPN_MASK);
+}
+
 struct rvt_sge_state;
 
 /*