[PATCH v2 00/53] migration/rdma: Error handling fixes

[Markus Armbruster]

Oh dear, where to start.  There's so much wrong, and in pretty obvious
ways.  This code should never have passed review.  I'm refraining from
saying more; see the commit messages instead.

Issues remaining after this series include:

* Terrible error messages

* Some error message cascades remain

* There is no written contract for QEMUFileHooks, and the
  responsibility for reporting errors is unclear

* There seem to be no tests whatsoever

PATCH 29 is arguably a matter of taste.  I made my case for it during
review of v1.  If maintainers don't want it, I'll drop it.

Related: [PATCH 1/7] migration/rdma: Fix save_page method to fail on
polling error

v2:
* PATCH 06: New
* PATCH 07: Tweak local variables in _readv() and _writev() for
  consistency [Fabiano]
* PATCH 13: Drop a comment that has become useless [Fabiano]
* PATCH 14: Fix spelling of qemu_rdma_buffer_mergeable() [Eric]
* PATCH 16: New; adding temporary FIXMEs
* PATCH 17: Fix typo in commit message [Li Zhijian]
* PATCH 26: Squash in old PATCH 23 [Li Zhijian]
* PATCH 27: Fix type of RDMAContext member @errored [Eric]
* PATCH 40: Resolve a temporary FIXME
* PATCH 44: Drop advice on qemu_rdma_alloc_pd_cq() failure in
  qemu_rdma_source_init() [Li Zhijian]
* PATCH 46+49: Resolve a temporary FIXME
* PATCH 51: Downgrade to warning instead of silence [Li Zhijian]
* PATCH 52: Resolve the last temporary FIXME
* PATCH 53: Convert to tracing instead [Li Zhijian]

Markus Armbruster (53):
  migration/rdma: Clean up qemu_rdma_poll()'s return type
  migration/rdma: Clean up qemu_rdma_data_init()'s return type
  migration/rdma: Clean up rdma_delete_block()'s return type
  migration/rdma: Drop fragile wr_id formatting
  migration/rdma: Consistently use uint64_t for work request IDs
  migration/rdma: Fix unwanted integer truncation
  migration/rdma: Clean up two more harmless signed vs. unsigned issues
  migration/rdma: Give qio_channel_rdma_source_funcs internal linkage
  migration/rdma: Fix qemu_rdma_accept() to return failure on errors
  migration/rdma: Put @errp parameter last
  migration/rdma: Eliminate error_propagate()
  migration/rdma: Drop rdma_add_block() error handling
  migration/rdma: Drop qemu_rdma_search_ram_block() error handling
  migration/rdma: Make qemu_rdma_buffer_mergeable() return bool
  migration/rdma: Use bool for two RDMAContext flags
  migration/rdma: Fix or document problematic uses of errno
  migration/rdma: Ditch useless numeric error codes in error messages
  migration/rdma: Fix io_writev(), io_readv() methods to obey contract
  migration/rdma: Replace dangerous macro CHECK_ERROR_STATE()
  migration/rdma: Fix qemu_rdma_broken_ipv6_kernel() to set error
  migration/rdma: Fix qemu_get_cm_event_timeout() to always set error
  migration/rdma: Drop dead qemu_rdma_data_init() code for !@host_port
  migration/rdma: Fix QEMUFileHooks method return values
  migration/rdma: Fix rdma_getaddrinfo() error checking
  migration/rdma: Return -1 instead of negative errno code
  migration/rdma: Dumb down remaining int error values to -1
  migration/rdma: Replace int error_state by bool errored
  migration/rdma: Drop superfluous assignments to @ret
  migration/rdma: Check negative error values the same way everywhere
  migration/rdma: Plug a memory leak and improve a message
  migration/rdma: Delete inappropriate error_report() in macro ERROR()
  migration/rdma: Retire macro ERROR()
  migration/rdma: Fix error handling around rdma_getaddrinfo()
  migration/rdma: Drop "@errp is clear" guards around error_setg()
  migration/rdma: Convert qemu_rdma_exchange_recv() to Error
  migration/rdma: Convert qemu_rdma_exchange_send() to Error
  migration/rdma: Convert qemu_rdma_exchange_get_response() to Error
  migration/rdma: Convert qemu_rdma_reg_whole_ram_blocks() to Error
  migration/rdma: Convert qemu_rdma_write_flush() to Error
  migration/rdma: Convert qemu_rdma_write_one() to Error
  migration/rdma: Convert qemu_rdma_write() to Error
  migration/rdma: Convert qemu_rdma_post_send_control() to Error
  migration/rdma: Convert qemu_rdma_post_recv_control() to Error
  migration/rdma: Convert qemu_rdma_alloc_pd_cq() to Error
  migration/rdma: Silence qemu_rdma_resolve_host()
  migration/rdma: Silence qemu_rdma_connect()
  migration/rdma: Silence qemu_rdma_reg_control()
  migration/rdma: Don't report received completion events as error
  migration/rdma: Silence qemu_rdma_block_for_wrid()
  migration/rdma: Silence qemu_rdma_register_and_get_keys()
  migration/rdma: Downgrade qemu_rdma_cleanup() errors to warnings
  migration/rdma: Use error_report() & friends instead of stderr
  migration/rdma: Replace flawed device detail dump by tracing

 migration/rdma.c       | 1026 ++++++++++++++++++++--------------------
 migration/trace-events |   10 +-
 2 files changed, 514 insertions(+), 522 deletions(-)

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2.41.0