def test_sq_overflow(nvme0):
cq = IOCQ(nvme0, 1, 5, PRP())
sq = IOSQ(nvme0, 1, 2, PRP(), cqid=1)
# send commands
sq[0] = SQE(4 << 16 + 0, 1)
sq.tail = 1
time.sleep(0.1)
sq[1] = SQE(3 << 16 + 0, 1)
sq.tail = 0
time.sleep(0.1)
# check cq
assert cq[0][3] == 0x10004
assert cq[1][3] == 0x10003
assert cq[2][3] == 0
time.sleep(1)
assert cq[2][3] == 0
assert cq[3][3] == 0
assert cq[4][3] == 0
logging.debug(sq[0])
logging.debug(cq[0])
sq.delete()
cq.delete()
def test_sq_overflow(nvme0):
cq = IOCQ(nvme0, 1, 5, PRP())
sq = IOSQ(nvme0, 1, 2, PRP(), cqid=1)
# send commands
sq[0] = SQE(4<<16+0, 1); sq.tail = 1
sq[1] = SQE(3<<16+0, 1); sq.tail = 0
sq[0] = SQE(2<<16+0, 1); sq.tail = 0
with pytest.warns(UserWarning, match="AER notification is triggered: 0x10100"):
nvme0.getfeatures(7).waitdone()
# check cq
time.sleep(0.1)
assert cq[0][3] == 0x10004
assert cq[1][3] == 0x10003
assert cq[2][3] == 0
time.sleep(1)
assert cq[2][3] == 0
assert cq[3][3] == 0
assert cq[4][3] == 0
logging.info(sq[0])
logging.info(cq[0])
sq.delete()
cq.delete()
def test_sq_cq_another_sq(nvme0):
cq = IOCQ(nvme0, 1, 3, PRP())
# send commands in sq1
sq = IOSQ(nvme0, 1, 3, PRP(), cqid=1)
sq[0] = SQE(4 << 16 + 0, 1)
sq[1] = SQE(3 << 16 + 0, 1)
sq.tail = 2
sq2 = IOSQ(nvme0, 2, 3, PRP(), cqid=1)
sq2[0] = SQE(2 << 16 + 0, 1)
sq2[1] = SQE(1 << 16 + 0, 1)
sq2.tail = 2
# check cq
time.sleep(0.1)
assert cq[0][3] == 0x10004
assert cq[1][3] == 0x10003
assert cq[2][3] == 0
cq.head = 1
time.sleep(0.1)
assert cq[2][3] == 0x10002
assert cq[0][3] == 0x10004
cq.head = 2
time.sleep(0.1)
assert cq[0][3] == 0x00001
sq.delete()
sq2.delete()
cq.delete()
def test_sq_cq_around(nvme0):
cq = IOCQ(nvme0, 1, 3, PRP())
sq = IOSQ(nvme0, 1, 2, PRP(), cqid=1)
# send commands
sq[0] = SQE(4<<16+0, 1); sq.tail = 1
sq[1] = SQE(3<<16+0, 1); sq.tail = 0
sq[0] = SQE(2<<16+0, 1); sq.tail = 1
sq[1] = SQE(1<<16+0, 1); sq.tail = 0
# check cq
time.sleep(0.1)
assert cq[0][3] == 0x10004
assert cq[1][3] == 0x10003
assert cq[2][3] == 0
cq.head = 1
assert cq[0][3] == 0x10004
assert cq[2][3] == 0x10002
cq.head = 2
assert cq[2][3] == 0x10002
assert cq[1][3] == 0x10003
assert cq[0][3] == 0x00001
sq.delete()
cq.delete()
def _test_cq_sqhd_aer(nvme0, buf):
#Create cq and sq
a = ()
cq = IOCQ(nvme0, 1, 5, PRP())
sq = IOSQ(nvme0, 1, 5, PRP(), cqid=1)
#Trigger aer cmd response by invaild doorbell write value
sq.tail = 5
time.sleep(0.1)
#Invalid Doorbell Write Value
with pytest.warns(UserWarning,
match="AER notification is triggered: 0x10100"):
nvme0.waitdone()
sq.delete()
cq.delete()
def call_back_cpl(cpl):
nonlocal a
a = cpl
#Check normal cmd cqe sqhd value
nvme0.getlogpage(1, buf, cb=call_back_cpl).waitdone()
sqhd1 = a[2] & 0xffff
logging.info(sqhd1)
nvme0.aer(cb=call_back_cpl)
nvme0.getlogpage(1, buf, cb=call_back_cpl).waitdone()
sqhd2 = a[2] & 0xffff
logging.info(sqhd2)
assert sqhd2 == sqhd1 + 2
#Trigger aer cmd response by invaild doorbell write value
cq = IOCQ(nvme0, 1, 5, PRP())
sq = IOSQ(nvme0, 1, 5, PRP(), cqid=1)
sq.tail = 5
time.sleep(0.1)
#Invalid Doorbell Write Value
with pytest.warns(UserWarning,
match="AER notification is triggered: 0x10100"):
nvme0.waitdone()
#verify aer cmd cqe sqhd
sqhd_aer = a[2] & 0xffff
sqhd_aer = sqhd2 + 2
logging.info("aer sqhd is {}".format(sqhd_aer))
sq.delete()
cq.delete()
#verify the following cmd cqe sqhd
nvme0.getlogpage(1, buf, cb=call_back_cpl).waitdone()
sqhd3 = a[2] & 0xffff
assert sqhd3 == sqhd_aer + 3
logging.info(sqhd3)
def test_reset_with_outstanding_io(nvme0, nvme0n1, delay, io_count=100):
nvme0n1.format(512)
logging.debug("format done")
cq = IOCQ(nvme0, 1, 128, PRP(1024 * 64))
sq = IOSQ(nvme0, 1, 128, PRP(1024 * 64), cqid=1)
write_cmd = SQE(1, 1)
write_cmd[12] = 7 # 4K write
buf_list = []
for i in range(io_count):
buf = PRP(ptype=32, pvalue=i) # use cid as data pattern
buf_list.append(buf)
write_cmd.prp1 = buf
write_cmd.cid = i
write_cmd[10] = i
sq[i] = write_cmd
sq.tail = io_count
# reset while io is active
logging.debug("write done")
time.sleep(delay)
nvme0.reset()
# read after reset with outstanding writes
cq = IOCQ(nvme0, 1, 128, PRP(1024 * 64))
sq = IOSQ(nvme0, 1, 128, PRP(1024 * 64), cqid=1)
read_cmd = SQE(2, 1)
read_cmd[12] = 7 # 4K read
buf_list = []
for i in range(io_count):
buf = PRP()
buf_list.append(buf)
read_cmd.prp1 = buf
read_cmd.cid = i
read_cmd[10] = i
sq[i] = read_cmd
sq.tail = io_count
logging.debug("read done")
# data verify
time.sleep(3)
assert cq[io_count - 1].p != 0
for i in range(io_count):
cid = cq[i].cid
dp = buf_list[cq[i].cid].data(3, 0) # check data pattern
logging.debug("cpl %d: cid %d, data pattern %d" % (i, cid, dp))
assert dp == 0 or dp == cid
sq.delete()
cq.delete()
def test_cq_sqhd(nvme0):
cq = IOCQ(nvme0, 1, 3, PRP())
sq = IOSQ(nvme0, 1, 2, PRP(), cqid=1)
# send commands, and check cqe
sq[0] = SQE(4 << 16 + 0, 1)
sq.tail = 1
time.sleep(0.1)
assert cq[0][2] == 0x10001
assert cq[0][3] == 0x10004
assert cq[1][2] == 0
assert cq[2][2] == 0
# send commands, and check cqe
sq[1] = SQE(3 << 16 + 0, 1)
sq.tail = 0
time.sleep(0.1)
assert cq[0][2] == 0x10001
assert cq[0][3] == 0x10004
assert cq[1][2] == 0x10000
assert cq[1][3] == 0x10003
assert cq[2][2] == 0
# send commands, and check cqe
sq[0] = SQE(2 << 16 + 0, 1)
sq.tail = 1
time.sleep(0.1)
assert cq[0][2] == 0x10001
assert cq[0][3] == 0x10004
assert cq[1][2] == 0x10000
assert cq[1][3] == 0x10003
assert cq[2][2] == 0
# free one cqe before get 3rd cqe
cq.head = 1
time.sleep(0.1)
assert cq[2][2] == 0x10001
assert cq[2][3] == 0x10002
# send commands, and check cqe
sq[1] = SQE(1 << 16 + 0, 1)
sq.tail = 0
time.sleep(0.1)
cq.head = 2
time.sleep(0.1)
assert cq[0][2] == 0x10000
assert cq[0][3] == 0x00001
assert cq[1][2] == 0x10000
assert cq[1][3] == 0x10003
assert cq[2][2] == 0x10001
assert cq[2][3] == 0x10002
def test_cq_p_phase_bit(nvme0):
cq = IOCQ(nvme0, 1, 3, PRP())
sq = IOSQ(nvme0, 1, 5, PRP(), cqid=1)
# send commands
sq[0] = SQE(4 << 16 + 0, 1)
sq[1] = SQE(3 << 16 + 0, 1)
sq[2] = SQE(2 << 16 + 0, 1)
sq[3] = SQE(1 << 16 + 0, 1)
sq.tail = 4
# check cq
time.sleep(0.1)
assert cq[0][3] == 0x10004
assert cq[1][3] == 0x10003
assert cq[2][3] == 0
cq.head = 1
time.sleep(0.1)
assert cq[2][3] == 0x10002
assert cq[0][3] == 0x10004
cq.head = 2
time.sleep(0.1)
# p-bit changed to 0
assert cq[0][3] == 0x00001
def test_sq_doorbell(nvme0):
cq = IOCQ(nvme0, 1, 5, PRP())
sq = IOSQ(nvme0, 1, 2, PRP(), cqid=1)
sq.tail = 1
time.sleep(0.1)
sq.delete()
cq.delete()
def test_sq_cid1(nvme0):
cq = IOCQ(nvme0, 1, 3, PRP())
sq = IOSQ(nvme0, 1, 3, PRP(), cqid=1)
# send discontinuous cid commands
sq[0] = SQE(4 << 16 + 0, 1)
sq.tail = 1
time.sleep(0.1)
sq[1] = SQE(1 << 16 + 0, 1)
sq.tail = 2
time.sleep(0.1)
# check cq
time.sleep(0.1)
assert cq[0][3] == 0x10004
assert cq[1][3] == 0x10001
sq.delete()
cq.delete()
def test_cid_conflict(nvme0):
mdts_lba = nvme0.mdts // 512
cq = IOCQ(nvme0, 1, 20, PRP())
sq = IOSQ(nvme0, 1, 20, PRP(), cqid=1)
# prp for the long buffer
write_buf_1 = PRP(ptype=32, pvalue=0xaaaaaaaa)
pages = mdts_lba // 8
pages -= 1
prp_list = PRPList()
prp_list_head = prp_list
while pages:
logging.info(pages)
for i in range(63):
if pages:
prp_list[i] = PRP()
pages -= 1
logging.debug(pages)
if pages > 1:
tmp = PRPList()
prp_list[63] = tmp
prp_list = tmp
logging.debug("prp_list")
elif pages == 1:
prp_list[63] = PRP()
pages -= 1
logging.debug(pages)
#send first cmd
w1 = SQE((1 << 16) + 1, 1)
w1.prp1 = write_buf_1
w1.prp2 = prp_list_head
w1[12] = mdts_lba - 1 # 0based, nlba
sq[0] = w1
sq[1] = w1
logging.info(sq[0])
logging.info(sq[1])
assert sq[0][0] >> 16 == 1
assert sq[1][0] >> 16 == 1
sq.tail = 2
time.sleep(1)
logging.info(cq[0])
logging.info(cq[1])
cqe = CQE(cq[0])
assert cqe.p == 1
status = (cqe[3] >> 17) & 0x3ff
assert status == 0 or status == 0x0003
cqe = CQE(cq[1])
assert cqe.p == 1
status = (cqe[3] >> 17) & 0x3ff
assert status == 0 or status == 0x0003
cq.head = 2
sq.delete()
cq.delete()
def test_sq_doorbell_invalid(nvme0, tail):
cq = IOCQ(nvme0, 1, 5, PRP())
sq = IOSQ(nvme0, 1, 2, PRP(), cqid=1)
sq.tail = tail
time.sleep(0.1)
#Invalid Doorbell Write Value
with pytest.warns(UserWarning, match="AER notification is triggered: 0x10100"):
nvme0.getfeatures(7).waitdone()
sq.delete()
cq.delete()
def test_sq_fuse_is_zero(nvme0):
cq = IOCQ(nvme0, 1, 3, PRP())
sq = IOSQ(nvme0, 1, 3, PRP(), cqid=1)
# FUSE field is zero.
sq[0] = SQE((1<<16) + (0<<8), 1); sq.tail = 1; time.sleep(0.1)
# check cq
time.sleep(0.1)
assert cq[0][3] == 0x10001
sq.delete()
cq.delete()
def test_sq_reserved(nvme0):
cq = IOCQ(nvme0, 1, 3, PRP())
sq = IOSQ(nvme0, 1, 3, PRP(), cqid=1)
# Reserved field is non-zero.
sq[0] = SQE((1<<16) + (7<<10) + 0, 1); sq.tail = 1; time.sleep(0.1)
# check cq
time.sleep(0.1)
assert cq[0][3] == 0x10001
sq.delete()
cq.delete()
def test_sq_fuse_is_reserved(nvme0):
cq = IOCQ(nvme0, 1, 3, PRP())
sq = IOSQ(nvme0, 1, 3, PRP(), cqid=1)
# FUSE field is 0x3(Reserved).
sq[0] = SQE((1<<16) + (3<<8), 1); sq.tail = 1; time.sleep(0.1)
# check cq
time.sleep(0.1)
#sct=0,sc=2(Invalid Field in Command)
assert cq[0][3]>>17 == 0x0002
sq.delete()
cq.delete()
def test_sq_ns_invalid(nvme0,ns_id):
cq = IOCQ(nvme0, 1, 3, PRP())
sq = IOSQ(nvme0, 1, 3, PRP(), cqid=1)
# ns field is invalid.
sq[0] = SQE(2, ns_id); sq.tail = 1; time.sleep(0.1)
# check cq
time.sleep(0.1)
#sct=0,sc=0x0b(Invalid Namespace or Format)
assert (cq[0][3]>>17)&0x3ff == 0x000b
sq.delete()
cq.delete()
def test_sq_opc_invalid_nvm_cmd(nvme0,opc_id):
cq = IOCQ(nvme0, 1, 3, PRP())
sq = IOSQ(nvme0, 1, 3, PRP(), cqid=1)
# OPC field is invalid.
sq[0] = SQE((1<<16) + opc_id, 1); sq.tail = 1; time.sleep(0.1)
# check cq
time.sleep(0.1)
#sct=0,sc=1(Invalid Command Opcode)
assert (cq[0][3]>>17)&0x3ff == 0x0001
sq.delete()
cq.delete()
def test_sq_cid2(nvme0):
cq = IOCQ(nvme0, 1, 3, PRP())
sq = IOSQ(nvme0, 1, 3, PRP(), cqid=1)
# send max/min cid commands
sq[0] = SQE(0xFFFF<<16+0, 1);
sq[1] = SQE(0<<16+0, 1); sq.tail = 2; time.sleep(0.1)
# check cq
time.sleep(0.1)
assert cq[0][3] == 0x1FFFF
assert cq[1][3] == 0x10000
sq.delete()
cq.delete()
def test_write_mdts(nvme0, mdts):
cq = IOCQ(nvme0, 1, 2, PRP())
sq = IOSQ(nvme0, 1, 2, PRP(), cqid=1)
# prp for the long buffer
write_buf_1 = PRP(ptype=32, pvalue=0xaaaaaaaa)
pages = mdts // 8
pages -= 1
prp_list = PRPList()
prp_list_head = prp_list
while pages:
for i in range(511):
if pages:
prp_list[i] = PRP()
pages -= 1
logging.debug(pages)
if pages > 1:
tmp = PRPList()
prp_list[511] = tmp
prp_list = tmp
logging.debug("prp_list")
elif pages == 1:
prp_list[511] = PRP()
pages -= 1
logging.debug(pages)
w1 = SQE(1, 1)
w1.prp1 = write_buf_1
w1.prp2 = prp_list_head
w1[12] = mdts - 1 # 0based, nlba
w1.cid = 0x123
sq[0] = w1
sq.tail = 1
time.sleep(1)
cqe = CQE(cq[0])
logging.info(cqe)
assert cqe.p == 1
assert cqe.cid == 0x123
assert cqe.sqhd == 1
logging.info("cqe status is {}".format(cqe.status))
assert cqe.status == 0 or cqe.status == 2
cq.head = 1
sq.delete()
cq.delete()
def test_pcie_link_control_aspm(nvme0, pcie, aspm): #1:0
linkctrl_addr = pcie.cap_offset(0x10) + 16
linkctrl = pcie.register(linkctrl_addr, 2)
logging.info("link control register [0x%x]= 0x%x" %
(linkctrl_addr, linkctrl))
# set ASPM control
pcie[linkctrl_addr] = (linkctrl & 0xfc) | aspm
linkctrl = pcie.register(linkctrl_addr, 2)
logging.info("link control register [0x%x]= 0x%x" %
(linkctrl_addr, linkctrl))
# IO queue for read commands
cq = IOCQ(nvme0, 1, 16, PRP())
sq = IOSQ(nvme0, 1, 16, PRP(), cqid=1)
# read lba 0 for 1000 times, interleaved with delays
read_cmd = SQE(2, 1)
read_cmd.prp1 = PRPList()
pbit = 1
for i in range(100):
logging.debug(i)
slot = i % 16
if slot == 0:
pbit = not pbit
next_slot = slot + 1
if next_slot == 16:
next_slot = 0
sq[slot] = read_cmd
sq.tail = next_slot
while cq[slot].p == pbit:
pass
cq.head = next_slot
# delay to trigger ASPM
time.sleep(0.01)
sq.delete()
cq.delete()
time.sleep(1)
#return ASPM L0
pcie[linkctrl_addr] = (linkctrl & 0xfc) | 0
def test_controller_cc_en(nvme0):
en=nvme0[0x14]&0x1
logging.info("en:{}".format(en))
logging.info("cc:{}".format(nvme0[0x14]))
assert nvme0[0x14] == 0x00460001
cq = IOCQ(nvme0, 1, 3, PRP())
sq = IOSQ(nvme0, 1, 3, PRP(), cqid=1)
sq[0] = SQE(2, 1); sq.tail = 1; time.sleep(0.1)
# check cq
time.sleep(0.1)
assert (cq[0][3]>>17)&0x3ff == 0x0000
sq.delete()
cq.delete()
#change cc.en from '1' to '0'
nvme0[0x14] = 0
#wait csts.rdy change from '1' to '0'
while not (nvme0[0x1c]&0x1)==0:
pass
nvme0.aer()
try:
nvme0.waitdone()
except Exception as e:
logging.warning(e)
if 0 != nvme0.init_adminq():
raise NvmeEnumerateError("fail to init admin queue")
#change cc.en from '0' to '1'
nvme0[0x14] = 0x00460001
#wait csts.rdy change from '0' to '1'
while not (nvme0[0x1c]&0x1)==1:
pass
assert nvme0[0x14] ==0x00460001
def test_invalid_offset_prp_in_list(nvme0):
cq = IOCQ(nvme0, 1, 10, PRP())
sq = IOSQ(nvme0, 1, 10, PRP(), cqid=1)
buf = PRP(ptype=32, pvalue=0xffffffff)
buf.offset = 0x10
prp_list = PRPList()
prp_list.offset = 0x20
for i in range(8):
tmp = PRP(ptype=32, pvalue=0xffffffff)
tmp.offset = 0x10
prp_list[i] = tmp
logging.info(prp_list.dump(64))
print(buf.dump(32))
for i in range(8):
print(prp_list[i].dump(32))
cmd = SQE(2, 1)
cmd.prp1 = buf
cmd.prp2 = prp_list
cmd[12] = 0x4000001f
sq[0] = cmd
logging.info(sq[0])
sq.tail = 1
while CQE(cq[0]).p == 0:
pass
cq.head = 1
logging.info(cq[0])
logging.info(hex(cq[0][3] >> 17))
print(buf.dump(32))
for i in range(8):
print(prp_list[i].dump(32))
status = (cq[0][3] >> 17) & 0x3ff
assert status == 0x0013 or status == 0
sq.delete()
cq.delete()
def test_p_invert_after_cq_2_pass(nvme0):
"""
The value of the Phase Tag is inverted each pass filling the Complete Queue.
"""
# cqid: 1, PC, depth: 2
cq = IOCQ(nvme0, 1, 2, PRP())
# create four SQ, both use the same CQ
sq3 = IOSQ(nvme0, 3, 10, PRP(), cqid=1)
# IO command templates: opcode and namespace
write_cmd = SQE(1, 1)
# write in sq3
w1 = SQE(*write_cmd)
write_buf = PRP(ptype=32, pvalue=0xaaaaaaaa)
w1.prp1 = write_buf
w1[10] = 1
w1[12] = 1 # 0based
w1.cid = 0x123
sq3[0] = w1
sq3.tail = 1
# add some delay, so ssd should finish w1 before w2
time.sleep(0.1)
# write in sq5
w1.cid = 0x567
sq3[1] = w1
sq3.tail = 2
logging.info("aaa")
# cqe for w1
while CQE(cq[0]).p == 0: pass
cqe = CQE(cq[0])
assert cqe.cid == 0x123
assert cqe.sqid == 3
assert cqe.sqhd == 1
cq.head = 1
# cqe for w2
logging.info("bbb")
while CQE(cq[1]).p == 0: pass
logging.info("ccc")
cqe = CQE(cq[1])
assert cqe.cid == 0x567
assert cqe.sqid == 3
assert cqe.sqhd == 2
cq.head = 0
assert CQE(cq[0]).p == 1
assert CQE(cq[1]).p == 1
# write in sq3
w1.cid = 0x147
sq3[2] = w1
sq3.tail = 3
# add some delay, so ssd should finish w1 before w2
time.sleep(0.1)
# write in sq5
w1.cid = 0x167
sq3[3] = w1
sq3.tail = 4
# cqe for w3
while CQE(cq[0]).p == 1: pass
cqe = CQE(cq[0])
assert cqe.cid == 0x147
assert cqe.sqid == 3
assert cqe.sqhd == 3
cq.head = 1
# cqe for w4
while CQE(cq[1]).p == 1: pass
cqe = CQE(cq[1])
assert cqe.cid == 0x167
assert cqe.sqid == 3
assert cqe.sqhd == 4
cq.head = 0
assert CQE(cq[0]).p == 0
assert CQE(cq[1]).p == 0
def test_controller_mdts(nvme0,nvme0n1):
if nvme0.mdts == 1024*1024: # up to 1MB
pytest.skip("mdts is maximum")
mps_min = (nvme0.cap>>48) & 0xf
logging.info("mps_min:{}".format(mps_min))
mdts=nvme0.id_data(77,77)
logging.info("mdts:{}".format(mdts))
max_data_size=(2**mdts)*(2**(12+mps_min))
logging.info(max_data_size)
max_pages=max_data_size//4//1024
pages=max_pages-1
max_lba=max_data_size//512
cq = IOCQ(nvme0, 1, 5, PRP())
sq = IOSQ(nvme0, 1, 5, PRP(), cqid=1)
# prp for the long buffer
write_buf_1 = PRP(ptype=32, pvalue=0xaaaaaaaa)
prp_list = PRPList()
prp_list_head = prp_list
while pages:
for i in range(511):
if pages:
prp_list[i] = PRP()
pages -= 1
logging.debug(pages)
if pages>1:
tmp = PRPList()
prp_list[511] = tmp
prp_list = tmp
logging.debug("prp_list")
elif pages==1:
prp_list[511] = PRP()
pages -= 1
logging.debug(pages)
w1 = SQE(1, 1)
w1.prp1 = write_buf_1
w1.prp2 = prp_list_head
w1[12] = max_lba-1 # 0based, nlba
w1.cid = 0x123
sq[0] = w1
sq.tail = 1
time.sleep(1)
cqe = CQE(cq[0])
logging.info(cqe)
assert cqe.p == 1
assert cqe.cid == 0x123
assert cqe.sqhd == 1
assert cqe.status == 0
cq.head = 1
w2 = SQE(1, 1)
w2.prp1 = write_buf_1
w2.prp2 = prp_list_head
w2[12] = max_lba # 0based, nlba
w2.cid = 0x234
sq[1] = w2
sq.tail = 2
time.sleep(1)
cqe = CQE(cq[1])
logging.info(cqe)
assert cqe.p == 1
assert cqe.cid == 0x234
assert cqe.sqhd == 2
assert cqe.status == 2
cq.head = 2
r1 = SQE(2, 1)
r1.prp1 = write_buf_1
r1.prp2 = prp_list_head
r1[12] = max_lba # 0based, nlba
r1.cid = 0x345
sq[2] = r1
sq.tail = 3
time.sleep(1)
cqe = CQE(cq[2])
logging.info(cqe)
assert cqe.p == 1
assert cqe.cid == 0x345
assert cqe.sqhd == 3
assert cqe.status == 2
cq.head = 3
r2 = SQE(2, 1)
r2.prp1 = write_buf_1
r2.prp2 = prp_list_head
r2[12] = max_lba-1 # 0based, nlba
r2.cid = 0x456
sq[3] = r2
sq.tail = 4
time.sleep(1)
cqe = CQE(cq[3])
logging.info(cqe)
assert cqe.p == 1
assert cqe.cid == 0x456
assert cqe.sqhd == 4
assert cqe.status == 0
cq.head = 4
sq.delete()
cq.delete()