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    SubjectRe: [PATCH v2 04/13] Connection Manager
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    On Tue, 2006-12-05 at 19:31 +0300, Evgeniy Polyakov wrote:
    > On Tue, Dec 05, 2006 at 10:12:42AM -0600, Steve Wise (swise@opengridcomputing.com) wrote:
    > > Ah. Data from an offloaded connection cannot leak into the main stack
    > > nor vice-verse. We can take an active RDMA connection establishment as
    > > an example if you want: Once the message is sent to the HW to "setup a
    > > TCP connection from addr/port a.b to addr/port c.d", then packets on
    > > that connection (that 4-tuple) will always be delivered to the RDMA
    > > driver, not the native stack. If the the packet received after the
    > > connection is setup is -not- an MPA reply (in this example), then the
    > > connection is aborted. Once the connection is aborted. So no leaking
    > > can happen.
    >
    > And if there were a dataflow between addr/port a.b to addr/port c.d
    > already, it will either terminated?
    >
    > Considering the following sequence:
    > handlers->t3c_handlers->sched()->work_queue->work_handlers()->for
    > example CPL_PASS_ACCEPT_REQ->pass_accept_req() - it just parses incoming
    > skb and sets port/addr/route and other fields to be used as a base for rdma
    > connection. What if it just a usual network packet from kernelspace or
    > userspace with the same payload as should be sent by remote rdma system?
    >

    That skb isn't a network packet. Its a CPL_PASS_ACCEPT_REQ message (see
    struct cpl_pass_accept_req in the Ethernet driver t3_cpl.h). If the
    RDMA driver hadn't registered to listen on that addr/port, it would
    never get this skb. Once a connection is established, the MPA messages
    (and any TCP payload data) is delivered to the RDMA driver in the form
    of skb's containing struct cpl_rx_data. So these skbs aren't just TCP
    packets at all. They either control messages or TCP payload. Either way
    they are encapsulated in CPL message structures.

    Does this make sense?



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