[PATCHv8 3/4] libibverbs: Add API to retrieve eth link layer address

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

Add a command to retrieve the layer 2 address of an ethernet port. The layer 2
address is comprised of the port's MAC address and the VLAN ID.This is required
by libraries to build work requests when the port's link layer is Ethernet.

Signed-off-by: Eli Cohen <eli-VPRAkNaXOzVS1MOuV/RT9w@public.gmane.org>
---
 include/infiniband/driver.h   |    2 ++
 include/infiniband/kern-abi.h |   23 ++++++++++++++++++++++-
 src/cmd.c                     |   24 ++++++++++++++++++++++++
 src/libibverbs.map            |    1 +
 4 files changed, 49 insertions(+), 1 deletions(-)

diff --git a/include/infiniband/driver.h b/include/infiniband/driver.h
index 9a81416..3e09548 100644
--- a/include/infiniband/driver.h
+++ b/include/infiniband/driver.h
@@ -131,6 +131,8 @@ int ibv_cmd_create_ah(struct ibv_pd *pd, struct ibv_ah *ah,
 int ibv_cmd_destroy_ah(struct ibv_ah *ah);
 int ibv_cmd_attach_mcast(struct ibv_qp *qp, const union ibv_gid *gid, uint16_t lid);
 int ibv_cmd_detach_mcast(struct ibv_qp *qp, const union ibv_gid *gid, uint16_t lid);
+int ibv_cmd_get_eth_l2_addr(struct ibv_pd *pd, uint8_t port, const union ibv_gid *gid,
+			    int sgid_idx, uint8_t *mac, uint16_t *vlan_id, uint8_t *tagged);
 
 int ibv_dontfork_range(void *base, size_t size);
 int ibv_dofork_range(void *base, size_t size);
diff --git a/include/infiniband/kern-abi.h b/include/infiniband/kern-abi.h
index 619ea7e..642c7db 100644
--- a/include/infiniband/kern-abi.h
+++ b/include/infiniband/kern-abi.h
@@ -85,7 +85,8 @@ enum {
 	IB_USER_VERBS_CMD_MODIFY_SRQ,
 	IB_USER_VERBS_CMD_QUERY_SRQ,
 	IB_USER_VERBS_CMD_DESTROY_SRQ,
-	IB_USER_VERBS_CMD_POST_SRQ_RECV
+	IB_USER_VERBS_CMD_POST_SRQ_RECV,
+	IB_USER_VERBS_CMD_GET_ETH_L2_ADDR,
 };
 
 /*
@@ -804,6 +805,7 @@ enum {
 	 * trick opcodes in IBV_INIT_CMD() doesn't break.
 	 */
 	IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL_V2 = -1,
+	IB_USER_VERBS_CMD_GET_ETH_L2_ADDR_V2 = -1,
 };
 
 struct ibv_destroy_cq_v1 {
@@ -879,4 +881,23 @@ struct ibv_create_srq_resp_v5 {
 	__u32 srq_handle;
 };
 
+struct ibv_get_eth_l2_addr {
+	__u32 command;
+	__u16 in_words;
+	__u16 out_words;
+	__u64 response;
+	__u32 pd_handle;
+	__u8  port;
+	__u8  sgid_idx;
+	__u8  reserved[2];
+	__u8  dgid[16];
+};
+
+struct ibv_get_eth_l2_addr_resp {
+	__u8	mac[6];
+	__u16   vlan_id;
+	__u8	tagged;
+	__u8	reserved[3];
+};
+
 #endif /* KERN_ABI_H */
diff --git a/src/cmd.c b/src/cmd.c
index 39af833..6a3c101 100644
--- a/src/cmd.c
+++ b/src/cmd.c
@@ -1123,3 +1123,27 @@ int ibv_cmd_detach_mcast(struct ibv_qp *qp, const union ibv_gid *gid, uint16_t l
 
 	return 0;
 }
+
+int ibv_cmd_get_eth_l2_addr(struct ibv_pd *pd, uint8_t port, const union ibv_gid *gid,
+			    int sgid_idx, uint8_t *mac, uint16_t *vlan_id, uint8_t *tagged)
+
+{
+	struct ibv_get_eth_l2_addr cmd;
+	struct ibv_get_eth_l2_addr_resp resp;
+
+	IBV_INIT_CMD_RESP(&cmd, sizeof cmd, GET_ETH_L2_ADDR, &resp, sizeof resp);
+	memcpy(cmd.dgid, gid, sizeof cmd.dgid);
+	cmd.pd_handle = pd->handle;
+	cmd.port = port;
+	cmd.sgid_idx = sgid_idx;
+
+	if (write(pd->context->cmd_fd, &cmd, sizeof cmd) != sizeof cmd)
+		return errno;
+
+	memcpy(mac, resp.mac, 6);
+	*vlan_id = resp.vlan_id;
+	*tagged = resp.tagged;
+
+	return 0;
+}
+
diff --git a/src/libibverbs.map b/src/libibverbs.map
index 1827da0..af52d0d 100644
--- a/src/libibverbs.map
+++ b/src/libibverbs.map
@@ -64,6 +64,7 @@ IBVERBS_1.0 {
 		ibv_cmd_destroy_ah;
 		ibv_cmd_attach_mcast;
 		ibv_cmd_detach_mcast;
+		ibv_cmd_get_eth_l2_addr;
 		ibv_copy_qp_attr_from_kern;
 		ibv_copy_path_rec_from_kern;
 		ibv_copy_path_rec_to_kern;
-- 
1.7.0

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