MFC r342946: Remove accessing remote node and domain objects
while processing cam actions.
Issue:
ocs_fc(4) driver panics. It's induced by setting the port_state
sysctl to offline, then online, then offline, then online, and so
forth and so on in rapid succession.

Reason:
While we set the port_state to online fc discovery will start and OS
is enumerating the target discs by calling ocs_action(), then set the
port state to "offline" which deletes domain/sport/nodes.

In ocs_action()->XPT_GET_TRAN_SETTINGS we are accessing the remote
node which can be invalid to get the wwpn, wwnn and port.

Fix:
Removed accessing of remote node and domain in some ocs_action() cases.
Populated the required values from ocs_fcport.
This removes the dependency of node and domain structures while
processing XPT_PATH_INQ and XPT_GET_TRAN_SETTINGS.
We will invalidate the target entries after the device lost
timeout(30 seconds).

Approved by:ken,mav

MFC r336446: Implemented Device Lost Timer,
which is used to give target device the time to recover before marking dead.

Issue: IO fails immediately after doing port-toggle.
Fix: Added LDT(Device Lost Timer)- we wait a specific period of time prior to telling the OS about lost device.

Approved by: ken, mav
Differential Revision: D16196

MFC r331766, r331768:

------------------------------------------------------------------------
r331766 | ken | 2018-03-30 09:28:25 -0600 (Fri, 30 Mar 2018) | 25 lines

Bring in the Broadcom/Emulex Fibre Channel driver, ocs_fc(4).

The ocs_fc(4) driver supports the following hardware:

Emulex 16/8G FC GEN 5 HBAS
LPe15004 FC Host Bus Adapters
LPe160XX FC Host Bus Adapters

Emulex 32/16G FC GEN 6 HBAS
LPe3100X FC Host Bus Adapters
LPe3200X FC Host Bus Adapters

The driver supports target and initiator mode, and also supports FC-Tape.

Note that the driver only currently works on little endian platforms. It
is only included in the module build for amd64 and i386, and in GENERIC
on amd64 only.

Submitted by: Ram Kishore Vegesna <ram.vegesna@broadcom.com>
Reviewed by: mav
Relnotes: yes
Sponsored by: Broadcom
Differential Revision: https://reviews.freebsd.org/D11423

------------------------------------------------------------------------
r331768 | cem | 2018-03-30 10:44:54 -0600 (Fri, 30 Mar 2018) | 9 lines

ocs_fc(4): Fix GCC build (-Wredundant-decls)

These objects are defined earlier in the same file; an extern declaration
after definition is redundant.

Broken in r331766 (introduction of ocs_fc(4)).

Sponsored by: Dell EMC Isilon

------------------------------------------------------------------------

Differential Revision: https://reviews.freebsd.org/D11423
Relnotes: yes

Bring in the Broadcom/Emulex Fibre Channel driver, ocs_fc(4).

The ocs_fc(4) driver supports the following hardware:

Emulex 16/8G FC GEN 5 HBAS
LPe15004 FC Host Bus Adapters
LPe160XX FC Host Bus Adapters

Emulex 32/16G FC GEN 6 HBAS
LPe3100X FC Host Bus Adapters
LPe3200X FC Host Bus Adapters

The driver supports target and initiator mode, and also supports FC-Tape.

Note that the driver only currently works on little endian platforms. It
is only included in the module build for amd64 and i386, and in GENERIC
on amd64 only.

Submitted by: Ram Kishore Vegesna <ram.vegesna@broadcom.com>
Reviewed by: mav
MFC after: 5 days
Relnotes: yes
Sponsored by: Broadcom
Differential Revision: https://reviews.freebsd.org/D11423