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, 22 insertions, 11 deletions

diff --git a/drivers/infiniband/hw/hfi1/driver.c b/drivers/infiniband/hw/hfi1/driver.c
index e5a57ebd8da4..94dca95db04f 100644
--- a/drivers/infiniband/hw/hfi1/driver.c
+++ b/drivers/infiniband/hw/hfi1/driver.c
@@ -1483,38 +1483,51 @@ static int hfi1_setup_bypass_packet(struct hfi1_packet *packet)
 	struct hfi1_pportdata *ppd = rcd->ppd;
 	struct hfi1_ibport *ibp = &ppd->ibport_data;
 	u8 l4;
-	u8 grh_len;
 
 	packet->hdr = (struct hfi1_16b_header *)
 			hfi1_get_16B_header(packet->rcd->dd,
 					    packet->rhf_addr);
-	packet->hlen = (u8 *)packet->rhf_addr - (u8 *)packet->hdr;
-
 	l4 = hfi1_16B_get_l4(packet->hdr);
 	if (l4 == OPA_16B_L4_IB_LOCAL) {
-		grh_len = 0;
 		packet->ohdr = packet->ebuf;
 		packet->grh = NULL;
+		packet->opcode = ib_bth_get_opcode(packet->ohdr);
+		packet->pad = hfi1_16B_bth_get_pad(packet->ohdr);
+		/* hdr_len_by_opcode already has an IB LRH factored in */
+		packet->hlen = hdr_len_by_opcode[packet->opcode] +
+			(LRH_16B_BYTES - LRH_9B_BYTES);
+		packet->migrated = opa_bth_is_migration(packet->ohdr);
 	} else if (l4 == OPA_16B_L4_IB_GLOBAL) {
 		u32 vtf;
+		u8 grh_len = sizeof(struct ib_grh);
 
-		grh_len = sizeof(struct ib_grh);
 		packet->ohdr = packet->ebuf + grh_len;
 		packet->grh = packet->ebuf;
+		packet->opcode = ib_bth_get_opcode(packet->ohdr);
+		packet->pad = hfi1_16B_bth_get_pad(packet->ohdr);
+		/* hdr_len_by_opcode already has an IB LRH factored in */
+		packet->hlen = hdr_len_by_opcode[packet->opcode] +
+			(LRH_16B_BYTES - LRH_9B_BYTES) + grh_len;
+		packet->migrated = opa_bth_is_migration(packet->ohdr);
+
 		if (packet->grh->next_hdr != IB_GRH_NEXT_HDR)
 			goto drop;
 		vtf = be32_to_cpu(packet->grh->version_tclass_flow);
 		if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)
 			goto drop;
+	} else if (l4 == OPA_16B_L4_FM) {
+		packet->mgmt = packet->ebuf;
+		packet->ohdr = NULL;
+		packet->grh = NULL;
+		packet->opcode = IB_OPCODE_UD_SEND_ONLY;
+		packet->pad = OPA_16B_L4_FM_PAD;
+		packet->hlen = OPA_16B_L4_FM_HLEN;
+		packet->migrated = false;
 	} else {
 		goto drop;
 	}
 
 	/* Query commonly used fields from packet header */
-	packet->opcode = ib_bth_get_opcode(packet->ohdr);
-	/* hdr_len_by_opcode already has an IB LRH factored in */
-	packet->hlen = hdr_len_by_opcode[packet->opcode] +
-		(LRH_16B_BYTES - LRH_9B_BYTES) + grh_len;
 	packet->payload = packet->ebuf + packet->hlen - LRH_16B_BYTES;
 	packet->slid = hfi1_16B_get_slid(packet->hdr);
 	packet->dlid = hfi1_16B_get_dlid(packet->hdr);
@@ -1524,10 +1537,8 @@ static int hfi1_setup_bypass_packet(struct hfi1_packet *packet)
 					    16B);
 	packet->sc = hfi1_16B_get_sc(packet->hdr);
 	packet->sl = ibp->sc_to_sl[packet->sc];
-	packet->pad = hfi1_16B_bth_get_pad(packet->ohdr);
 	packet->extra_byte = SIZE_OF_LT;
 	packet->pkey = hfi1_16B_get_pkey(packet->hdr);
-	packet->migrated = opa_bth_is_migration(packet->ohdr);
 
 	if (hfi1_bypass_ingress_pkt_check(packet))
 		goto drop;