cxgbe tom: Handle a race condition when enabling TLS offload

[jhb]

Summary

Use a separate state for when a request to set RX_QUIESCE has been
sent but the resulting TCB reply has not been received. In
particular, this correctly handles the case where data has been
received and queued in the receive queue before the quiesce request
takes effect.

Sponsored by: Chelsio Communications

[jhb]

I ran into this testing the DDP changes for NFS (was ensuring that TLS offload was used instead of DDP for supported TLS 1.2 ciphers). This race was triggered on the server side where presumably the client had sent an RPC immediately after completing the TLS handshake.