IB/hfi1: Add support to send 16B bypass packets

We introduce struct hfi1_opa_header as a union
of ib (9B) and 16B headers.

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@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>

drivers/infiniband/hw/hfi1/rc.c

@@ -273,9 +273,9 @@ int hfi1_make_rc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
 	if (IS_ERR(ps->s_txreq))
 		goto bail_no_tx;
 
-	ohdr = &ps->s_txreq->phdr.hdr.u.oth;
+	ohdr = &ps->s_txreq->phdr.hdr.ibh.u.oth;
 	if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)
-		ohdr = &ps->s_txreq->phdr.hdr.u.l.oth;
+		ohdr = &ps->s_txreq->phdr.hdr.ibh.u.l.oth;
 
 	/* Sending responses has higher priority over sending requests. */
 	if ((qp->s_flags & RVT_S_RESP_PENDING) &&
@@ -724,7 +724,8 @@ void hfi1_send_rc_ack(struct hfi1_ctxtdata *rcd, struct rvt_qp *qp,
 	u32 vl, plen;
 	struct send_context *sc;
 	struct pio_buf *pbuf;
-	struct ib_header hdr;
+	struct hfi1_opa_header opah;
+	struct ib_header *hdr;
 	struct ib_other_headers *ohdr;
 	unsigned long flags;
 
@@ -741,16 +742,19 @@ void hfi1_send_rc_ack(struct hfi1_ctxtdata *rcd, struct rvt_qp *qp,
 		goto queue_ack;
 
 	/* Construct the header */
+	opah.hdr_type = 0;
+	hdr = &opah.ibh;
+
 	/* header size in 32-bit words LRH+BTH+AETH = (8+12+4)/4 */
 	hwords = 6;
 	if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) {
-		hwords += hfi1_make_grh(ibp, &hdr.u.l.grh,
+		hwords += hfi1_make_grh(ibp, &hdr->u.l.grh,
 					rdma_ah_read_grh(&qp->remote_ah_attr),
 					hwords, 0);
-		ohdr = &hdr.u.l.oth;
+		ohdr = &hdr->u.l.oth;
 		lrh0 = HFI1_LRH_GRH;
 	} else {
-		ohdr = &hdr.u.oth;
+		ohdr = &hdr->u.oth;
 		lrh0 = HFI1_LRH_BTH;
 	}
 	/* read pkey_index w/o lock (its atomic) */
@@ -768,11 +772,11 @@ void hfi1_send_rc_ack(struct hfi1_ctxtdata *rcd, struct rvt_qp *qp,
 	pbc_flags |= (ib_is_sc5(sc5) << PBC_DC_INFO_SHIFT);
 	lrh0 |= (sc5 & 0xf) << 12 | (rdma_ah_get_sl(&qp->remote_ah_attr)
 				     & 0xf) << 4;
-	hdr.lrh[0] = cpu_to_be16(lrh0);
-	hdr.lrh[1] = cpu_to_be16(rdma_ah_get_dlid(&qp->remote_ah_attr));
-	hdr.lrh[2] = cpu_to_be16(hwords + SIZE_OF_CRC);
-	hdr.lrh[3] = cpu_to_be16(ppd->lid |
-				 rdma_ah_get_path_bits(&qp->remote_ah_attr));
+	hdr->lrh[0] = cpu_to_be16(lrh0);
+	hdr->lrh[1] = cpu_to_be16(rdma_ah_get_dlid(&qp->remote_ah_attr));
+	hdr->lrh[2] = cpu_to_be16(hwords + SIZE_OF_CRC);
+	hdr->lrh[3] = cpu_to_be16(ppd->lid |
+				  rdma_ah_get_path_bits(&qp->remote_ah_attr));
 	ohdr->bth[0] = cpu_to_be32(bth0);
 	ohdr->bth[1] = cpu_to_be32(qp->remote_qpn);
 	ohdr->bth[1] |= cpu_to_be32((!!is_fecn) << IB_BECN_SHIFT);
@@ -799,10 +803,10 @@ void hfi1_send_rc_ack(struct hfi1_ctxtdata *rcd, struct rvt_qp *qp,
 	}
 
 	trace_ack_output_ibhdr(dd_from_ibdev(qp->ibqp.device),
-			       &hdr, ib_is_sc5(sc5));
+			       &opah, ib_is_sc5(sc5));
 
 	/* write the pbc and data */
-	ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc, &hdr, hwords);
+	ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc, hdr, hwords);
 
 	return;
 
@@ -985,9 +989,10 @@ static void reset_sending_psn(struct rvt_qp *qp, u32 psn)
 /*
  * This should be called with the QP s_lock held and interrupts disabled.
  */
-void hfi1_rc_send_complete(struct rvt_qp *qp, struct ib_header *hdr)
+void hfi1_rc_send_complete(struct rvt_qp *qp, struct hfi1_opa_header *opah)
 {
 	struct ib_other_headers *ohdr;
+	struct ib_header *hdr = &opah->ibh;
 	struct rvt_swqe *wqe;
 	u32 opcode;
 	u32 psn;

drivers/infiniband/hw/hfi1/ruc.c

@@ -668,7 +668,8 @@ u32 hfi1_make_grh(struct hfi1_ibport *ibp, struct ib_grh *hdr,
 	return sizeof(struct ib_grh) / sizeof(u32);
 }
 
-#define BTH2_OFFSET (offsetof(struct hfi1_sdma_header, hdr.u.oth.bth[2]) / 4)
+#define BTH2_OFFSET (offsetof(struct hfi1_sdma_header, \
+			      hdr.ibh.u.oth.bth[2]) / 4)
 
 /**
  * build_ahg - create ahg in s_ahg
@@ -743,8 +744,8 @@ void hfi1_make_ruc_header(struct rvt_qp *qp, struct ib_other_headers *ohdr,
 	if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) {
 		qp->s_hdrwords +=
 			hfi1_make_grh(ibp,
-				      &ps->s_txreq->phdr.hdr.u.l.grh,
-				      rdma_ah_read_grh(&qp->remote_ah_attr),
+				      &ps->s_txreq->phdr.hdr.ibh.u.l.grh,
+				      &qp->remote_ah_attr.grh,
 				      qp->s_hdrwords, nwords);
 		lrh0 = HFI1_LRH_GRH;
 		middle = 0;
@@ -773,14 +774,14 @@ void hfi1_make_ruc_header(struct rvt_qp *qp, struct ib_other_headers *ohdr,
 		build_ahg(qp, bth2);
 	else
 		qp->s_flags &= ~RVT_S_AHG_VALID;
-	ps->s_txreq->phdr.hdr.lrh[0] = cpu_to_be16(lrh0);
-	ps->s_txreq->phdr.hdr.lrh[1] =
+	ps->s_txreq->phdr.hdr.ibh.lrh[0] = cpu_to_be16(lrh0);
+	ps->s_txreq->phdr.hdr.ibh.lrh[1] =
 		cpu_to_be16(rdma_ah_get_dlid(&qp->remote_ah_attr));
-	ps->s_txreq->phdr.hdr.lrh[2] =
+	ps->s_txreq->phdr.hdr.ibh.lrh[2] =
 		cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC);
-	ps->s_txreq->phdr.hdr.lrh[3] =
+	ps->s_txreq->phdr.hdr.ibh.lrh[3] =
 		cpu_to_be16(ppd_from_ibp(ibp)->lid |
-			    rdma_ah_get_path_bits(&qp->remote_ah_attr));
+		rdma_ah_get_path_bits(&qp->remote_ah_attr));
 	bth0 |= hfi1_get_pkey(ibp, qp->s_pkey_index);
 	bth0 |= extra_bytes << 20;
 	ohdr->bth[0] = cpu_to_be32(bth0);

drivers/infiniband/hw/hfi1/trace_ibhdrs.h

@@ -213,9 +213,9 @@ DEFINE_EVENT(hfi1_input_ibhdr_template, input_ibhdr,
 
 DECLARE_EVENT_CLASS(hfi1_output_ibhdr_template,
 		    TP_PROTO(struct hfi1_devdata *dd,
-			     struct ib_header *hdr,
+			     struct hfi1_opa_header *opah,
 			     bool sc5),
-		    TP_ARGS(dd, hdr, sc5),
+		    TP_ARGS(dd, opah, sc5),
 		    TP_STRUCT__entry(
 			DD_DEV_ENTRY(dd)
 			__field(u8, lnh)
@@ -238,10 +238,11 @@ DECLARE_EVENT_CLASS(hfi1_output_ibhdr_template,
 			__field(u32, psn)
 			/* extended headers */
 			__dynamic_array(u8, ehdrs,
-					hfi1_trace_ib_hdr_len(hdr))
+					hfi1_trace_ib_hdr_len(&opah->ibh))
 			),
 		    TP_fast_assign(
 			struct ib_other_headers *ohdr;
+			struct ib_header *hdr = &opah->ibh;
 
 			DD_DEV_ASSIGN(dd);
 
@@ -294,18 +295,18 @@ DECLARE_EVENT_CLASS(hfi1_output_ibhdr_template,
 
 DEFINE_EVENT(hfi1_output_ibhdr_template, pio_output_ibhdr,
 	     TP_PROTO(struct hfi1_devdata *dd,
-		      struct ib_header *hdr, bool sc5),
-	     TP_ARGS(dd, hdr, sc5));
+		      struct hfi1_opa_header *opah, bool sc5),
+	     TP_ARGS(dd, opah, sc5));
 
 DEFINE_EVENT(hfi1_output_ibhdr_template, ack_output_ibhdr,
 	     TP_PROTO(struct hfi1_devdata *dd,
-		      struct ib_header *hdr, bool sc5),
-	     TP_ARGS(dd, hdr, sc5));
+		      struct hfi1_opa_header *opah, bool sc5),
+	     TP_ARGS(dd, opah, sc5));
 
 DEFINE_EVENT(hfi1_output_ibhdr_template, sdma_output_ibhdr,
 	     TP_PROTO(struct hfi1_devdata *dd,
-		      struct ib_header *hdr, bool sc5),
-	     TP_ARGS(dd, hdr, sc5));
+		      struct hfi1_opa_header *opah, bool sc5),
+	     TP_ARGS(dd, opah, sc5));
 
 
 #endif /* __HFI1_TRACE_IBHDRS_H */

drivers/infiniband/hw/hfi1/uc.c

@@ -93,9 +93,9 @@ int hfi1_make_uc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
 		goto done_free_tx;
 	}
 
-	ohdr = &ps->s_txreq->phdr.hdr.u.oth;
+	ohdr = &ps->s_txreq->phdr.hdr.ibh.u.oth;
 	if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)
-		ohdr = &ps->s_txreq->phdr.hdr.u.l.oth;
+		ohdr = &ps->s_txreq->phdr.hdr.ibh.u.l.oth;
 
 	/* Get the next send request. */
 	wqe = rvt_get_swqe_ptr(qp, qp->s_cur);

drivers/infiniband/hw/hfi1/ud.c

@@ -357,12 +357,13 @@ int hfi1_make_ud_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
 
 	if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
 		/* Header size in 32-bit words. */
-		qp->s_hdrwords += hfi1_make_grh(ibp,
-						&ps->s_txreq->phdr.hdr.u.l.grh,
-						rdma_ah_read_grh(ah_attr),
-						qp->s_hdrwords, nwords);
+		qp->s_hdrwords +=
+			hfi1_make_grh(ibp,
+				      &ps->s_txreq->phdr.hdr.ibh.u.l.grh,
+				      rdma_ah_read_grh(ah_attr),
+				      qp->s_hdrwords, nwords);
 		lrh0 = HFI1_LRH_GRH;
-		ohdr = &ps->s_txreq->phdr.hdr.u.l.oth;
+		ohdr = &ps->s_txreq->phdr.hdr.ibh.u.l.oth;
 		/*
 		 * Don't worry about sending to locally attached multicast
 		 * QPs.  It is unspecified by the spec. what happens.
@@ -370,7 +371,7 @@ int hfi1_make_ud_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
 	} else {
 		/* Header size in 32-bit words. */
 		lrh0 = HFI1_LRH_BTH;
-		ohdr = &ps->s_txreq->phdr.hdr.u.oth;
+		ohdr = &ps->s_txreq->phdr.hdr.ibh.u.oth;
 	}
 	if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
 		qp->s_hdrwords++;
@@ -392,21 +393,21 @@ int hfi1_make_ud_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
 	ps->s_txreq->sde = priv->s_sde;
 	priv->s_sendcontext = qp_to_send_context(qp, priv->s_sc);
 	ps->s_txreq->psc = priv->s_sendcontext;
-	ps->s_txreq->phdr.hdr.lrh[0] = cpu_to_be16(lrh0);
-	ps->s_txreq->phdr.hdr.lrh[1] =
+	ps->s_txreq->phdr.hdr.ibh.lrh[0] = cpu_to_be16(lrh0);
+	ps->s_txreq->phdr.hdr.ibh.lrh[1] =
 		cpu_to_be16(rdma_ah_get_dlid(ah_attr));
-	ps->s_txreq->phdr.hdr.lrh[2] =
+	ps->s_txreq->phdr.hdr.ibh.lrh[2] =
 		cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC);
 	if (rdma_ah_get_dlid(ah_attr) == be16_to_cpu(IB_LID_PERMISSIVE)) {
-		ps->s_txreq->phdr.hdr.lrh[3] = IB_LID_PERMISSIVE;
+		ps->s_txreq->phdr.hdr.ibh.lrh[3] = IB_LID_PERMISSIVE;
 	} else {
 		lid = ppd->lid;
 		if (lid) {
 			lid |= rdma_ah_get_path_bits(ah_attr) &
 				((1 << ppd->lmc) - 1);
-			ps->s_txreq->phdr.hdr.lrh[3] = cpu_to_be16(lid);
+			ps->s_txreq->phdr.hdr.ibh.lrh[3] = cpu_to_be16(lid);
 		} else {
-			ps->s_txreq->phdr.hdr.lrh[3] = IB_LID_PERMISSIVE;
+			ps->s_txreq->phdr.hdr.ibh.lrh[3] = IB_LID_PERMISSIVE;
 		}
 	}
 	if (wqe->wr.send_flags & IB_SEND_SOLICITED)

drivers/infiniband/hw/hfi1/verbs.c

@@ -506,6 +506,24 @@ again:
 	}
 }
 
+static u8 get_opcode(struct hfi1_opa_header *hdr)
+{
+	struct ib_other_headers *ohdr;
+
+	if (hdr->hdr_type) {
+		if (hfi1_16B_get_l4(&hdr->opah) == OPA_16B_L4_IB_LOCAL)
+			ohdr = &hdr->opah.u.oth;
+		else
+			ohdr = &hdr->opah.u.l.oth;
+	} else {
+		if (ib_get_lnh(&hdr->ibh) == HFI1_LRH_BTH)
+			ohdr = &hdr->ibh.u.oth;
+		else
+			ohdr = &hdr->ibh.u.l.oth;
+	}
+	return ib_bth_get_opcode(ohdr);
+}
+
 /*
  * Make sure the QP is ready and able to accept the given opcode.
  */
@@ -686,7 +704,7 @@ static void verbs_sdma_complete(
 	if (tx->wqe) {
 		hfi1_send_complete(qp, tx->wqe, IB_WC_SUCCESS);
 	} else if (qp->ibqp.qp_type == IB_QPT_RC) {
-		struct ib_header *hdr;
+		struct hfi1_opa_header *hdr;
 
 		hdr = &tx->phdr.hdr;
 		hfi1_rc_send_complete(qp, hdr);
@@ -1175,7 +1193,7 @@ static inline send_routine get_send_routine(struct rvt_qp *qp,
 {
 	struct hfi1_devdata *dd = dd_from_ibdev(qp->ibqp.device);
 	struct hfi1_qp_priv *priv = qp->priv;
-	struct ib_header *h = &tx->phdr.hdr;
+	struct hfi1_opa_header *h = &tx->phdr.hdr;
 
 	if (unlikely(!(dd->flags & HFI1_HAS_SEND_DMA)))
 		return dd->process_pio_send;
@@ -1221,7 +1239,7 @@ int hfi1_verbs_send(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
 	int ret;
 	u8 lnh;
 
-	hdr = &ps->s_txreq->phdr.hdr;
+	hdr = &ps->s_txreq->phdr.hdr.ibh;
 	/* locate the pkey within the headers */
 	lnh = ib_get_lnh(hdr);
 	if (lnh == HFI1_LRH_GRH)

drivers/infiniband/hw/hfi1/verbs.h

@@ -115,6 +115,14 @@ struct hfi1_16b_header {
 	} u;
 } __packed;
 
+struct hfi1_opa_header {
+	union {
+		struct ib_header ibh; /* 9B header */
+		struct hfi1_16b_header opah; /* 16B header */
+	};
+	u8 hdr_type; /* 9B or 16B */
+} __packed;
+
 struct hfi1_ahg_info {
 	u32 ahgdesc[2];
 	u16 tx_flags;
@@ -124,7 +132,7 @@ struct hfi1_ahg_info {
 
 struct hfi1_sdma_header {
 	__le64 pbc;
-	struct ib_header hdr;
+	struct hfi1_opa_header hdr;
 } __packed;
 
 /*
@@ -326,7 +334,7 @@ u8 ah_to_sc(struct ib_device *ibdev, struct rdma_ah_attr *ah_attr);
 
 struct ib_ah *hfi1_create_qp0_ah(struct hfi1_ibport *ibp, u16 dlid);
 
-void hfi1_rc_send_complete(struct rvt_qp *qp, struct ib_header *hdr);
+void hfi1_rc_send_complete(struct rvt_qp *qp, struct hfi1_opa_header *opah);
 
 void hfi1_ud_rcv(struct hfi1_packet *packet);
 
@@ -347,16 +355,6 @@ int hfi1_check_send_wqe(struct rvt_qp *qp, struct rvt_swqe *wqe);
 extern const u32 rc_only_opcode;
 extern const u32 uc_only_opcode;
 
-static inline u8 get_opcode(struct ib_header *h)
-{
-	u16 lnh = be16_to_cpu(h->lrh[0]) & 3;
-
-	if (lnh == IB_LNH_IBA_LOCAL)
-		return be32_to_cpu(h->u.oth.bth[0]) >> 24;
-	else
-		return be32_to_cpu(h->u.l.oth.bth[0]) >> 24;
-}
-
 int hfi1_ruc_check_hdr(struct hfi1_ibport *ibp, struct hfi1_packet *packet);
 
 u32 hfi1_make_grh(struct hfi1_ibport *ibp, struct ib_grh *hdr,