On 4/10/2015 5:06 PM, ira.weiny wrote:
On Fri, Apr 10, 2015 at 01:17:23PM -0600, Jason Gunthorpe wrote: ... So trying to sum up. Have we settled on the following "capabilities"? Helper function names aside. /* legacy to communicate to userspace */ RDMA_LINK_LAYER_IB = 0x0000000000000001, RDMA_LINK_LAYER_ETH = 0x0000000000000002, RDMA_LINK_LAYER_MASK = 0x000000000000000f, /* more bits? */ /* I'm hoping we don't need more bits here */ /* legacy to communicate to userspace */ RDMA_TRANSPORT_IB = 0x0000000000000010, RDMA_TRANSPORT_IWARP = 0x0000000000000020, RDMA_TRANSPORT_USNIC = 0x0000000000000040, RDMA_TRANSPORT_USNIC_UDP = 0x0000000000000080, RDMA_TRANSPORT_MASK = 0x00000000000000f0, /* more bits? */ /* I'm hoping we don't need more bits here */ /* New flags */ RDMA_MGMT_IB_MAD = 0x0000000000000100, /* ib_mad module support */ RDMA_MGMT_QP0 = 0x0000000000000200, /* ib_mad QP0 support */ RDMA_MGMT_IB_SA = 0x0000000000000400, /* ib_sa module support */ /* NOTE includes IB Mcast */ RDMA_MGMT_IB_CM = 0x0000000000000800, /* ib_cm module support */ RDMA_MGMT_OPA_MAD = 0x0000000000001000, /* ib_mad OPA MAD support */ RDMA_MGMT_MASK = 0x00000000000fff00,
You explicitly say "userspace" - why would an upper layer need to know the link, transport and management details? These seem to be mid-layer matters.
RDMA_ADDR_IB = 0x0000000000100000, /* Port does IB AH, PR, Pkey */ RDMA_ADDR_IBoE = 0x0000000000200000, /* Port does IBoE AH, PR, Pkey */ /* Do we need iWarp (TCP) here? */ RDMA_ADDR_IB_MASK = 0x000000000ff00000,
I do see a ULP needing to know the address family needed to pass to rdma_connect and rdma_listen, so I would add "IP", but not "iWARP".
RDMA_SEPARATE_READ_SGE = 0x0000000010000000, RDMA_QUIRKS_MASK = 0x000000fff0000000
This is good, but it also needs an attribute to signal the need for a remote-writable RDMA Read sink buffer, for today's iWARP. Tom. -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
