[PATCH 1/3] RDMA/rxe: Replace netdev dev addr with raw_gid

[Zhu Yanjun <yanjun.zhu@xxxxxxxxx>]

Because TUN device does not have dev_addr, but a gid in rdma is needed,
as such, a raw_gid is generated to act as the gid. The similar commit is
in SIW. This commit learns from the similar commit bad5b6e34ffb
("RDMA/siw: Fabricate a GID on tun and loopback devices") in SIW.

Signed-off-by: Zhu Yanjun <yanjun.zhu@xxxxxxxxx>
---
 drivers/infiniband/sw/rxe/rxe.c       | 15 +++++++++++++--
 drivers/infiniband/sw/rxe/rxe_verbs.c |  2 +-
 drivers/infiniband/sw/rxe/rxe_verbs.h |  4 +++-
 3 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/drivers/infiniband/sw/rxe/rxe.c b/drivers/infiniband/sw/rxe/rxe.c
index 1ba4a0c8726a..432e54a29b99 100644
--- a/drivers/infiniband/sw/rxe/rxe.c
+++ b/drivers/infiniband/sw/rxe/rxe.c
@@ -78,8 +78,19 @@ static void rxe_init_device_param(struct rxe_dev *rxe)
 	if (!ndev)
 		return;
 
+	if (ndev->addr_len) {
+		memcpy(rxe->raw_gid, ndev->dev_addr,
+			min_t(unsigned int, ndev->addr_len, ETH_ALEN));
+	} else {
+		/*
+		 * This device does not have a HW address, but
+		 * connection mangagement requires a unique gid.
+		 */
+		eth_random_addr(rxe->raw_gid);
+	}
+
 	addrconf_addr_eui48((unsigned char *)&rxe->attr.sys_image_guid,
-			ndev->dev_addr);
+			rxe->raw_gid);
 
 	dev_put(ndev);
 
@@ -125,7 +136,7 @@ static void rxe_init_ports(struct rxe_dev *rxe)
 	if (!ndev)
 		return;
 	addrconf_addr_eui48((unsigned char *)&port->port_guid,
-			    ndev->dev_addr);
+			    rxe->raw_gid);
 	dev_put(ndev);
 	spin_lock_init(&port->port_lock);
 }
diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.c b/drivers/infiniband/sw/rxe/rxe_verbs.c
index 8a5fc20fd186..837566cd682c 100644
--- a/drivers/infiniband/sw/rxe/rxe_verbs.c
+++ b/drivers/infiniband/sw/rxe/rxe_verbs.c
@@ -1523,7 +1523,7 @@ int rxe_register_device(struct rxe_dev *rxe, const char *ibdev_name,
 	dev->num_comp_vectors = num_possible_cpus();
 	dev->local_dma_lkey = 0;
 	addrconf_addr_eui48((unsigned char *)&dev->node_guid,
-			    ndev->dev_addr);
+			    rxe->raw_gid);
 
 	dev->uverbs_cmd_mask |= BIT_ULL(IB_USER_VERBS_CMD_POST_SEND) |
 				BIT_ULL(IB_USER_VERBS_CMD_REQ_NOTIFY_CQ);
diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.h b/drivers/infiniband/sw/rxe/rxe_verbs.h
index 6573ceec0ef5..729a6ada46af 100644
--- a/drivers/infiniband/sw/rxe/rxe_verbs.h
+++ b/drivers/infiniband/sw/rxe/rxe_verbs.h
@@ -376,7 +376,9 @@ struct rxe_dev {
 	struct ib_device_attr	attr;
 	int			max_ucontext;
 	int			max_inline_data;
-	struct mutex	usdev_lock;
+	struct mutex		usdev_lock;
+
+	char			raw_gid[ETH_ALEN];
 
 	struct rxe_pool		uc_pool;
 	struct rxe_pool		pd_pool;
-- 
2.34.1