IB/core: Add subnet prefix to port info (fad61ad4) · Commits · 戴 / test

The subnet prefix is a part of the port_info MAD returned and should be available at the ib_port_attr struct. We define it here and provide a default implementation in case the hardware driver does not provide one. The subnet prefix is required when creating the address vector to access the SA in networks where GRH must be used. Signed-off-by:

Eli Cohen <eli@mellanox.com> Reviewed-by:

Or Gerlitz <ogerlitz@mellanox.com> Signed-off-by:

Doug Ledford <dledford@redhat.com>

drivers/infiniband/core/device.c

+14 −1

Original line number	Diff line number	Diff line
		@@ -650,10 +650,23 @@ int ib_query_port(struct ib_device *device,
		u8 port_num,
		struct ib_port_attr *port_attr)
		{
		union ib_gid gid;
		int err;

		if (port_num < rdma_start_port(device) \|\| port_num > rdma_end_port(device))
		return -EINVAL;

		return device->query_port(device, port_num, port_attr);
		memset(port_attr, 0, sizeof(*port_attr));
		err = device->query_port(device, port_num, port_attr);
		if (err \|\| port_attr->subnet_prefix)
		return err;

		err = ib_query_gid(device, port_num, 0, &gid, NULL);
		if (err)
		return err;

		port_attr->subnet_prefix = be64_to_cpu(gid.global.subnet_prefix);
		return 0;
		}
		EXPORT_SYMBOL(ib_query_port);

include/rdma/ib_verbs.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -490,6 +490,7 @@ union rdma_protocol_stats {
		\| RDMA_CORE_CAP_OPA_MAD)

		struct ib_port_attr {
		u64 subnet_prefix;
		enum ib_port_state state;
		enum ib_mtu max_mtu;
		enum ib_mtu active_mtu;

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