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afk.epic: Handle EPIC replies by subtype

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DCP only gets two reply types: a u32 retcode or a command reply. It
previously checked for retcode by checking length(data) == 4 and
assuming command otherwise. AOP can get other reply types (e.g. STRING
after probing device). It actually sends us the reply subtype in the
EPICSubHeader, so use that information and handle replies accordingly.

Signed-off-by: Eileen Yoon <eyn@gmx.com>
This commit is contained in:
Eileen Yoon 2024-01-23 20:09:14 +09:00 committed by Hector Martin
parent 6426bdf6a5
commit 5f59c5460c
1 changed files with 41 additions and 18 deletions
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37
proxyclient/m1n1/fw/afk/epic.py
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@ -26,7 +26,10 @@ EPICCategory = "EPICCategory" / Enum(Int8ul,
EPICSubtype = "EPICSubtype" / Enum(Int16ul,
ANNOUNCE = 0x30,
TEARDOWN = 0x32,
RETCODE_WITH_PAYLOAD = 0xa0,
STD_SERVICE = 0xc0,
RETCODE = 0x84,
STRING = 0x8a,
)
EPICHeader = Struct(
@ -132,17 +135,25 @@ class EPICService:
def handle_reply(self, category, type, seq, fd):
off = fd.tell()
data = fd.read()
if len(data) == 4:
retcode = struct.unpack("<I", data)[0]
if retcode:
raise EPICError(f"IOP returned errcode {retcode:#x}")
else:
self.reply = retcode
ret = data
if (hasattr(self, "last_call") and hasattr(self.last_call, "RETS")):
call = getattr(self, "last_call")
item = call.RETS.parse(data)
ret = item
self.reply = ret
return
if (type == EPICSubtype.RETCODE):
rc = struct.unpack("<I", data)[0]
self.log(f"Retcode #{seq}: {rc:#x}")
self.reply = ret
return
elif (type == EPICSubtype.STD_SERVICE):
fd.seek(off)
cmd = EPICCmd.parse_stream(fd)
payload = fd.read()
self.log(f"Response {type:#x} #{seq}: {cmd.retcode:#x}")
self.log(f"Response {int(type):#x} #{seq}: {cmd.retcode:#x}")
if cmd.retcode != 0:
raise EPICError(f"IOP returned errcode {cmd.retcode:#x}")
if payload:
@ -150,6 +161,18 @@ class EPICService:
chexdump(payload)
assert cmd.rxbuf == self.rxbuf_dva
self.reply = self.iface.readmem(self.rxbuf, cmd.rxlen)
return
elif (type == EPICSubtype.RETCODE_WITH_PAYLOAD):
rc = struct.unpack("<I", data[:4])[0]
self.log(f"Retcode #{seq}: {rc:#x}")
assert(rc == 0)
self.reply = ret
return
else:
self.log(f"#{seq}: Unknown reply type: {int(type):#x}")
chexdump(data)
self.reply = ret
return
def handle_cmd(self, category, type, seq, fd):
cmd = EPICCmd.parse_stream(fd)