[PATCHv7 1/2] libmlx4: Add RoCEE support

[Eli Cohen <eli-VPRAkNaXOzVS1MOuV/RT9w@public.gmane.org>]

Modify libmlx4 to support RoCEE. The change involves retrieving the MAC address
of a port based on its GID through a new system call, ibv_cmd_get_mac(), and
embedding the MAC in the address vector representation of mlx4.

Signed-off-by: Eli Cohen <eli-VPRAkNaXOzVS1MOuV/RT9w@public.gmane.org>
---
 src/mlx4.h  |    3 +++
 src/qp.c    |    2 ++
 src/verbs.c |   29 +++++++++++++++++++++++++++++
 src/wqe.h   |    3 ++-
 4 files changed, 36 insertions(+), 1 deletions(-)

diff --git a/src/mlx4.h b/src/mlx4.h
index 4445998..661255b 100644
--- a/src/mlx4.h
+++ b/src/mlx4.h
@@ -236,11 +236,14 @@ struct mlx4_av {
 	uint8_t				hop_limit;
 	uint32_t			sl_tclass_flowlabel;
 	uint8_t				dgid[16];
+	uint8_t				mac[8];
 };
 
 struct mlx4_ah {
 	struct ibv_ah			ibv_ah;
 	struct mlx4_av			av;
+	uint16_t			vlan;
+	uint8_t				mac[6];
 };
 
 static inline unsigned long align(unsigned long val, unsigned long align)
diff --git a/src/qp.c b/src/qp.c
index d194ae3..cd8fab0 100644
--- a/src/qp.c
+++ b/src/qp.c
@@ -143,6 +143,8 @@ static void set_datagram_seg(struct mlx4_wqe_datagram_seg *dseg,
 	memcpy(dseg->av, &to_mah(wr->wr.ud.ah)->av, sizeof (struct mlx4_av));
 	dseg->dqpn = htonl(wr->wr.ud.remote_qpn);
 	dseg->qkey = htonl(wr->wr.ud.remote_qkey);
+	dseg->vlan = htons(to_mah(wr->wr.ud.ah)->vlan);
+	memcpy(dseg->mac, to_mah(wr->wr.ud.ah)->mac, 6);
 }
 
 static void __set_data_seg(struct mlx4_wqe_data_seg *dseg, struct ibv_sge *sg)
diff --git a/src/verbs.c b/src/verbs.c
index 1ac1362..667ef68 100644
--- a/src/verbs.c
+++ b/src/verbs.c
@@ -614,9 +614,21 @@ int mlx4_destroy_qp(struct ibv_qp *ibqp)
 	return 0;
 }
 
+static int mcast_mac(uint8_t *mac)
+{
+	int i;
+	uint8_t val = 0xff;
+
+	for (i = 0; i < 6; ++i)
+		val &= mac[i];
+
+	return val == 0xff;
+}
+
 struct ibv_ah *mlx4_create_ah(struct ibv_pd *pd, struct ibv_ah_attr *attr)
 {
 	struct mlx4_ah *ah;
+	struct ibv_port_attr port_attr;
 
 	ah = malloc(sizeof *ah);
 	if (!ah)
@@ -642,7 +654,24 @@ struct ibv_ah *mlx4_create_ah(struct ibv_pd *pd, struct ibv_ah_attr *attr)
 		memcpy(ah->av.dgid, attr->grh.dgid.raw, 16);
 	}
 
+	if (ibv_query_port(pd->context, attr->port_num, &port_attr))
+		goto err;
+
+	if (port_attr.link_layer == IBV_LINK_LAYER_ETHERNET) {
+		if (ibv_cmd_get_mac(pd, attr->port_num, ah->av.dgid, ah->mac))
+			goto err;
+
+		ah->vlan = 0;
+		if (mcast_mac(ah->mac))
+			ah->av.dlid = htons(0xc000);
+
+	}
+
+
 	return &ah->ibv_ah;
+err:
+	free(ah);
+	return NULL;
 }
 
 int mlx4_destroy_ah(struct ibv_ah *ah)
diff --git a/src/wqe.h b/src/wqe.h
index 6f7f309..bbd22ba 100644
--- a/src/wqe.h
+++ b/src/wqe.h
@@ -78,7 +78,8 @@ struct mlx4_wqe_datagram_seg {
 	uint32_t		av[8];
 	uint32_t		dqpn;
 	uint32_t		qkey;
-	uint32_t		reserved[2];
+	uint16_t		vlan;
+	uint8_t			mac[6];
 };
 
 struct mlx4_wqe_data_seg {
-- 
1.6.6

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