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rds: tcp: send handshake ping-probe from passive endpoint
The RDS handshake ping probe added by commit 5916e2c ("RDS: TCP: Enable multipath RDS for TCP") is sent from rds_sendmsg() before the first data packet is sent to a peer. If the conversation is not bidirectional (i.e., one side is always passive and never invokes rds_sendmsg()) and the passive side restarts its rds_tcp module, a new HS ping probe needs to be sent, so that the number of paths can be re-established. This patch achieves that by sending a HS ping probe from rds_tcp_accept_one() when c_npaths is 0 (i.e., we have not done a handshake probe with this peer yet). Signed-off-by: Sowmini Varadhan <[email protected]> Tested-by: Jenny Xu <[email protected]> Signed-off-by: David S. Miller <[email protected]>
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