RDMA over Ethernet (RDMAoE) allows running the IB transport protocol using Ethernet frames, enabling the deployment of IB semantics on lossless Ethernet fabrics. RDMAoE packets are standard Ethernet frames with an IEEE assigned Ethertype, a GRH, unmodified IB transport headers and payload. IB subnet management and SA services are not required for RDMAoE operation; Ethernet management practices are used instead. RDMAoE encodes IP addresses into its GIDs and resolves MAC addresses using the host IP stack. For multicast GIDs, standard IP to MAC mappings apply.
To support RDMAoE, a new transport protocol was added to the IB core. An RDMA device can have ports with different transports, which are identified by a port transport attribute. The RDMA Verbs API is syntactically unmodified. When referring to RDMAoE ports, Address handles are required to contain GIDs while LID fields are ignored. The Ethernet L2 information is subsequently obtained by the vendor-specific driver (both in kernel- and user-space) while modifying QPs to RTR and creating address handles. As there is no SA in RDMAoE, the CMA code is modified to fill the necessary path record attributes locally before sending CM packets. Similarly, the CMA provides to the user the required address handle attributes when processing SIDR requests and joining multicast groups. In this patch set, an RDMAoE port is currently assigned a single GID, encoding the IPv6 link-local address of the corresponding netdev; the CMA RDMAoE code temporarily uses IPv6 link-local addresses as GIDs instead of the IP address provided by the user, thereby supporting any IP address. In addition, multicast packets currently use the broadcast MAC. To enable RDMAoE with the mlx4 driver stack, both the mlx4_en and mlx4_ib drivers must be loaded, and the netdevice for the corresponding RDMAoE port must be running. Individual ports of a multi port HCA can be independently configured as Ethernet (with support for RDMAoE) or IB, as is already the case. We have successfully tested MPI, SDP, RDS, and native Verbs applications over RDMAoE. Following is a series of 10 patches based on version 2.6.30 of the Linux kernel. This new series reflects changes based on feedback from the community on the previous set of patches, and is tagged v4. Changes from v3: 1. RDMA transport is determined on a per-port basis instead of the link-type notion. 2. SA services are not provided for RDMAoE clients. CMA code is modified to support RDMAoE transport types. 3. For brevity, GID to MAC resolution is currently restricted to link local addresses. Signed-off-by: Eli Cohen <[email protected]> --- b/drivers/infiniband/core/agent.c | 12 - b/drivers/infiniband/core/cm.c | 26 +- b/drivers/infiniband/core/cma.c | 54 ++-- b/drivers/infiniband/core/mad.c | 42 ++- b/drivers/infiniband/core/multicast.c | 5 b/drivers/infiniband/core/sa_query.c | 40 ++- b/drivers/infiniband/core/ucm.c | 8 b/drivers/infiniband/core/ucma.c | 2 b/drivers/infiniband/core/ud_header.c | 111 ++++++++++ b/drivers/infiniband/core/user_mad.c | 7 b/drivers/infiniband/core/uverbs.h | 1 b/drivers/infiniband/core/uverbs_cmd.c | 32 ++ b/drivers/infiniband/core/uverbs_main.c | 1 b/drivers/infiniband/core/verbs.c | 12 - b/drivers/infiniband/hw/mlx4/ah.c | 187 +++++++++++++--- b/drivers/infiniband/hw/mlx4/main.c | 309 +++++++++++++++++++++++++--- b/drivers/infiniband/hw/mlx4/mlx4_ib.h | 19 + b/drivers/infiniband/hw/mlx4/qp.c | 172 ++++++++++----- b/drivers/infiniband/ulp/ipoib/ipoib_main.c | 12 - b/drivers/net/mlx4/en_main.c | 15 + b/drivers/net/mlx4/en_port.c | 4 b/drivers/net/mlx4/en_port.h | 3 b/drivers/net/mlx4/fw.c | 3 b/drivers/net/mlx4/intf.c | 20 + b/drivers/net/mlx4/main.c | 6 b/drivers/net/mlx4/mlx4.h | 1 b/include/linux/mlx4/cmd.h | 1 b/include/linux/mlx4/device.h | 31 ++ b/include/linux/mlx4/driver.h | 16 + b/include/linux/mlx4/qp.h | 8 b/include/rdma/ib_addr.h | 87 +++++++ b/include/rdma/ib_pack.h | 26 ++ b/include/rdma/ib_user_verbs.h | 21 + b/include/rdma/ib_verbs.h | 9 b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c | 3 b/net/sunrpc/xprtrdma/svc_rdma_transport.c | 2 drivers/infiniband/core/cm.c | 2 drivers/infiniband/core/cma.c | 150 +++++++++++++ drivers/infiniband/core/mad.c | 55 +++- drivers/infiniband/core/ucm.c | 12 - drivers/infiniband/core/ucma.c | 25 +- drivers/infiniband/core/user_mad.c | 27 +- drivers/infiniband/core/verbs.c | 10 include/rdma/ib_verbs.h | 15 + 44 files changed, 1333 insertions(+), 271 deletions(-) _______________________________________________ general mailing list [email protected] http://lists.openfabrics.org/cgi-bin/mailman/listinfo/general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
