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Merge branch 'bpf-and-netdevsim-test-updates'

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Jakub Kicinski says:

====================
bpf and netdevsim test updates

A number of test improvements (delayed by merges).  Quentin provides
patches for checking printing to the verifier log from the drivers
and validating extack messages are propagated.  There is also a test
for replacing TC filters to avoid adding back the bug Daniel recently
fixed in net and stable.
====================

Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2018-01-23 20:24:32 -05:00
commit 43df215d99
4 changed files with 216 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/net/netdevsim/Makefile
View File

@ -4,4 +4,8 @@ obj-$(CONFIG_NETDEVSIM) += netdevsim.o
netdevsim-objs := \
netdev.o \
bpf.o \
ifeq ($(CONFIG_BPF_SYSCALL),y)
netdevsim-objs += \
bpf.o
endif

41
drivers/net/netdevsim/bpf.c
View File

@ -23,6 +23,9 @@
#include "netdevsim.h"
#define pr_vlog(env, fmt, ...) \
bpf_verifier_log_write(env, "[netdevsim] " fmt, ##__VA_ARGS__)
struct nsim_bpf_bound_prog {
struct netdevsim *ns;
struct bpf_prog *prog;
@ -77,6 +80,9 @@ nsim_bpf_verify_insn(struct bpf_verifier_env *env, int insn_idx, int prev_insn)
if (state->ns->bpf_bind_verifier_delay && !insn_idx)
msleep(state->ns->bpf_bind_verifier_delay);
if (insn_idx == env->prog->len - 1)
pr_vlog(env, "Hello from netdevsim!\n");
return 0;
}
@ -123,17 +129,35 @@ int nsim_bpf_setup_tc_block_cb(enum tc_setup_type type,
struct netdevsim *ns = cb_priv;
struct bpf_prog *oldprog;
if (type != TC_SETUP_CLSBPF ||
!tc_can_offload(ns->netdev) ||
cls_bpf->common.protocol != htons(ETH_P_ALL) ||
cls_bpf->common.chain_index)
if (type != TC_SETUP_CLSBPF) {
NSIM_EA(cls_bpf->common.extack,
"only offload of BPF classifiers supported");
return -EOPNOTSUPP;
}
if (!tc_can_offload_extack(ns->netdev, cls_bpf->common.extack))
return -EOPNOTSUPP;
if (!ns->bpf_tc_accept)
if (cls_bpf->common.protocol != htons(ETH_P_ALL)) {
NSIM_EA(cls_bpf->common.extack,
"only ETH_P_ALL supported as filter protocol");
return -EOPNOTSUPP;
}
if (cls_bpf->common.chain_index)
return -EOPNOTSUPP;
if (!ns->bpf_tc_accept) {
NSIM_EA(cls_bpf->common.extack,
"netdevsim configured to reject BPF TC offload");
return -EOPNOTSUPP;
}
/* Note: progs without skip_sw will probably not be dev bound */
if (prog && !prog->aux->offload && !ns->bpf_tc_non_bound_accept)
if (prog && !prog->aux->offload && !ns->bpf_tc_non_bound_accept) {
NSIM_EA(cls_bpf->common.extack,
"netdevsim configured to reject unbound programs");
return -EOPNOTSUPP;
}
if (cls_bpf->command != TC_CLSBPF_OFFLOAD)
return -EOPNOTSUPP;
@ -145,8 +169,11 @@ int nsim_bpf_setup_tc_block_cb(enum tc_setup_type type,
oldprog = NULL;
if (!cls_bpf->prog)
return 0;
if (ns->bpf_offloaded)
if (ns->bpf_offloaded) {
NSIM_EA(cls_bpf->common.extack,
"driver and netdev offload states mismatch");
return -EBUSY;
}
}
return nsim_bpf_offload(ns, cls_bpf->prog, oldprog);

28
drivers/net/netdevsim/netdevsim.h
View File

@ -68,12 +68,40 @@ struct netdevsim {
extern struct dentry *nsim_ddir;
#ifdef CONFIG_BPF_SYSCALL
int nsim_bpf_init(struct netdevsim *ns);
void nsim_bpf_uninit(struct netdevsim *ns);
int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf);
int nsim_bpf_disable_tc(struct netdevsim *ns);
int nsim_bpf_setup_tc_block_cb(enum tc_setup_type type,
void *type_data, void *cb_priv);
#else
static inline int nsim_bpf_init(struct netdevsim *ns)
{
return 0;
}
static inline void nsim_bpf_uninit(struct netdevsim *ns)
{
}
static inline int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf)
{
return bpf->command == XDP_QUERY_PROG ? 0 : -EOPNOTSUPP;
}
static inline int nsim_bpf_disable_tc(struct netdevsim *ns)
{
return 0;
}
static inline int
nsim_bpf_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
void *cb_priv)
{
return -EOPNOTSUPP;
}
#endif
static inline struct netdevsim *to_nsim(struct device *ptr)
{

179
tools/testing/selftests/bpf/test_offload.py
View File

@ -26,6 +26,7 @@ import time
logfile = None
log_level = 1
skip_extack = False
bpf_test_dir = os.path.dirname(os.path.realpath(__file__))
pp = pprint.PrettyPrinter()
devs = [] # devices we created for clean up
@ -132,7 +133,7 @@ def rm(f):
if f in files:
files.remove(f)
def tool(name, args, flags, JSON=True, ns="", fail=True):
def tool(name, args, flags, JSON=True, ns="", fail=True, include_stderr=False):
params = ""
if JSON:
params += "%s " % (flags["json"])
@ -140,9 +141,20 @@ def tool(name, args, flags, JSON=True, ns="", fail=True):
if ns != "":
ns = "ip netns exec %s " % (ns)
ret, out = cmd(ns + name + " " + params + args, fail=fail)
if JSON and len(out.strip()) != 0:
return ret, json.loads(out)
if include_stderr:
ret, stdout, stderr = cmd(ns + name + " " + params + args,
fail=fail, include_stderr=True)
else:
ret, stdout = cmd(ns + name + " " + params + args,
fail=fail, include_stderr=False)
if JSON and len(stdout.strip()) != 0:
out = json.loads(stdout)
else:
out = stdout
if include_stderr:
return ret, out, stderr
else:
return ret, out
@ -181,13 +193,15 @@ def bpftool_map_list_wait(expected=0, n_retry=20):
time.sleep(0.05)
raise Exception("Time out waiting for map counts to stabilize want %d, have %d" % (expected, nmaps))
def ip(args, force=False, JSON=True, ns="", fail=True):
def ip(args, force=False, JSON=True, ns="", fail=True, include_stderr=False):
if force:
args = "-force " + args
return tool("ip", args, {"json":"-j"}, JSON=JSON, ns=ns, fail=fail)
return tool("ip", args, {"json":"-j"}, JSON=JSON, ns=ns,
fail=fail, include_stderr=include_stderr)
def tc(args, JSON=True, ns="", fail=True):
return tool("tc", args, {"json":"-p"}, JSON=JSON, ns=ns, fail=fail)
def tc(args, JSON=True, ns="", fail=True, include_stderr=False):
return tool("tc", args, {"json":"-p"}, JSON=JSON, ns=ns,
fail=fail, include_stderr=include_stderr)
def ethtool(dev, opt, args, fail=True):
return cmd("ethtool %s %s %s" % (opt, dev["ifname"], args), fail=fail)
@ -348,13 +362,19 @@ class NetdevSim:
return ip("link set dev %s mtu %d" % (self.dev["ifname"], mtu),
fail=fail)
def set_xdp(self, bpf, mode, force=False, JSON=True, fail=True):
def set_xdp(self, bpf, mode, force=False, JSON=True, verbose=False,
fail=True, include_stderr=False):
if verbose:
bpf += " verbose"
return ip("link set dev %s xdp%s %s" % (self.dev["ifname"], mode, bpf),
force=force, JSON=JSON, fail=fail)
force=force, JSON=JSON,
fail=fail, include_stderr=include_stderr)
def unset_xdp(self, mode, force=False, JSON=True, fail=True):
def unset_xdp(self, mode, force=False, JSON=True,
fail=True, include_stderr=False):
return ip("link set dev %s xdp%s off" % (self.dev["ifname"], mode),
force=force, JSON=JSON, fail=fail)
force=force, JSON=JSON,
fail=fail, include_stderr=include_stderr)
def ip_link_show(self, xdp):
_, link = ip("link show dev %s" % (self['ifname']))
@ -409,17 +429,39 @@ class NetdevSim:
(len(filters), expected))
return filters
def cls_bpf_add_filter(self, bpf, da=False, skip_sw=False, skip_hw=False,
fail=True):
def cls_filter_op(self, op, qdisc="ingress", prio=None, handle=None,
cls="", params="",
fail=True, include_stderr=False):
spec = ""
if prio is not None:
spec += " prio %d" % (prio)
if handle:
spec += " handle %s" % (handle)
return tc("filter {op} dev {dev} {qdisc} {spec} {cls} {params}"\
.format(op=op, dev=self['ifname'], qdisc=qdisc, spec=spec,
cls=cls, params=params),
fail=fail, include_stderr=include_stderr)
def cls_bpf_add_filter(self, bpf, op="add", prio=None, handle=None,
da=False, verbose=False,
skip_sw=False, skip_hw=False,
fail=True, include_stderr=False):
cls = "bpf " + bpf
params = ""
if da:
params += " da"
if verbose:
params += " verbose"
if skip_sw:
params += " skip_sw"
if skip_hw:
params += " skip_hw"
return tc("filter add dev %s ingress bpf %s %s" %
(self['ifname'], bpf, params), fail=fail)
return self.cls_filter_op(op=op, prio=prio, handle=handle, cls=cls,
params=params,
fail=fail, include_stderr=include_stderr)
def set_ethtool_tc_offloads(self, enable, fail=True):
args = "hw-tc-offload %s" % ("on" if enable else "off")
@ -491,6 +533,23 @@ def check_dev_info(other_ns, ns, prog_file=None, map_file=None, removed=False):
fail("dev" not in m.keys(), "Device parameters not reported")
fail(dev != m["dev"], "Map's device different than program's")
def check_extack(output, reference, args):
if skip_extack:
return
lines = output.split("\n")
comp = len(lines) >= 2 and lines[1] == reference
fail(not comp, "Missing or incorrect netlink extack message")
def check_extack_nsim(output, reference, args):
check_extack(output, "Error: netdevsim: " + reference, args)
def check_verifier_log(output, reference):
lines = output.split("\n")
for l in reversed(lines):
if l == reference:
return
fail(True, "Missing or incorrect message from netdevsim in verifier log")
# Parse command line
parser = argparse.ArgumentParser()
parser.add_argument("--log", help="output verbose log to given file")
@ -527,6 +586,14 @@ for s in samples:
skip(ret != 0, "sample %s/%s not found, please compile it" %
(bpf_test_dir, s))
# Check if iproute2 is built with libmnl (needed by extack support)
_, _, err = cmd("tc qdisc delete dev lo handle 0",
fail=False, include_stderr=True)
if err.find("Error: Failed to find qdisc with specified handle.") == -1:
print("Warning: no extack message in iproute2 output, libmnl missing?")
log("Warning: no extack message in iproute2 output, libmnl missing?", "")
skip_extack = True
# Check if net namespaces seem to work
ns = mknetns()
skip(ns is None, "Could not create a net namespace")
@ -558,8 +625,10 @@ try:
sim.tc_flush_filters()
start_test("Test TC offloads are off by default...")
ret, _ = sim.cls_bpf_add_filter(obj, skip_sw=True, fail=False)
ret, _, err = sim.cls_bpf_add_filter(obj, skip_sw=True,
fail=False, include_stderr=True)
fail(ret == 0, "TC filter loaded without enabling TC offloads")
check_extack(err, "Error: TC offload is disabled on net device.", args)
sim.wait_for_flush()
sim.set_ethtool_tc_offloads(True)
@ -587,13 +656,44 @@ try:
sim.dfs["bpf_tc_non_bound_accept"] = "N"
start_test("Test TC cBPF unbound bytecode doesn't offload...")
ret, _ = sim.cls_bpf_add_filter(bytecode, skip_sw=True, fail=False)
ret, _, err = sim.cls_bpf_add_filter(bytecode, skip_sw=True,
fail=False, include_stderr=True)
fail(ret == 0, "TC bytecode loaded for offload")
check_extack_nsim(err, "netdevsim configured to reject unbound programs.",
args)
sim.wait_for_flush()
start_test("Test TC replace...")
sim.cls_bpf_add_filter(obj, prio=1, handle=1)
sim.cls_bpf_add_filter(obj, op="replace", prio=1, handle=1)
sim.cls_filter_op(op="delete", prio=1, handle=1, cls="bpf")
sim.cls_bpf_add_filter(obj, prio=1, handle=1, skip_sw=True)
sim.cls_bpf_add_filter(obj, op="replace", prio=1, handle=1, skip_sw=True)
sim.cls_filter_op(op="delete", prio=1, handle=1, cls="bpf")
sim.cls_bpf_add_filter(obj, prio=1, handle=1, skip_hw=True)
sim.cls_bpf_add_filter(obj, op="replace", prio=1, handle=1, skip_hw=True)
sim.cls_filter_op(op="delete", prio=1, handle=1, cls="bpf")
start_test("Test TC replace bad flags...")
for i in range(3):
for j in range(3):
ret, _ = sim.cls_bpf_add_filter(obj, op="replace", prio=1, handle=1,
skip_sw=(j == 1), skip_hw=(j == 2),
fail=False)
fail(bool(ret) != bool(j),
"Software TC incorrect load in replace test, iteration %d" %
(j))
sim.cls_filter_op(op="delete", prio=1, handle=1, cls="bpf")
sim.tc_flush_filters()
start_test("Test TC offloads work...")
ret, _ = sim.cls_bpf_add_filter(obj, skip_sw=True, fail=False)
ret, _, err = sim.cls_bpf_add_filter(obj, verbose=True, skip_sw=True,
fail=False, include_stderr=True)
fail(ret != 0, "TC filter did not load with TC offloads enabled")
check_verifier_log(err, "[netdevsim] Hello from netdevsim!")
start_test("Test TC offload basics...")
dfs = sim.dfs_get_bound_progs(expected=1)
@ -669,16 +769,24 @@ try:
"Device parameters reported for non-offloaded program")
start_test("Test XDP prog replace with bad flags...")
ret, _ = sim.set_xdp(obj, "offload", force=True, fail=False)
ret, _, err = sim.set_xdp(obj, "offload", force=True,
fail=False, include_stderr=True)
fail(ret == 0, "Replaced XDP program with a program in different mode")
ret, _ = sim.set_xdp(obj, "", force=True, fail=False)
check_extack_nsim(err, "program loaded with different flags.", args)
ret, _, err = sim.set_xdp(obj, "", force=True,
fail=False, include_stderr=True)
fail(ret == 0, "Replaced XDP program with a program in different mode")
check_extack_nsim(err, "program loaded with different flags.", args)
start_test("Test XDP prog remove with bad flags...")
ret, _ = sim.unset_xdp("offload", force=True, fail=False)
ret, _, err = sim.unset_xdp("offload", force=True,
fail=False, include_stderr=True)
fail(ret == 0, "Removed program with a bad mode mode")
ret, _ = sim.unset_xdp("", force=True, fail=False)
check_extack_nsim(err, "program loaded with different flags.", args)
ret, _, err = sim.unset_xdp("", force=True,
fail=False, include_stderr=True)
fail(ret == 0, "Removed program with a bad mode mode")
check_extack_nsim(err, "program loaded with different flags.", args)
start_test("Test MTU restrictions...")
ret, _ = sim.set_mtu(9000, fail=False)
@ -687,18 +795,20 @@ try:
sim.unset_xdp("drv")
bpftool_prog_list_wait(expected=0)
sim.set_mtu(9000)
ret, _ = sim.set_xdp(obj, "drv", fail=False)
ret, _, err = sim.set_xdp(obj, "drv", fail=False, include_stderr=True)
fail(ret == 0, "Driver should refuse to load program with MTU of 9000...")
check_extack_nsim(err, "MTU too large w/ XDP enabled.", args)
sim.set_mtu(1500)
sim.wait_for_flush()
start_test("Test XDP offload...")
sim.set_xdp(obj, "offload")
_, _, err = sim.set_xdp(obj, "offload", verbose=True, include_stderr=True)
ipl = sim.ip_link_show(xdp=True)
link_xdp = ipl["xdp"]["prog"]
progs = bpftool_prog_list(expected=1)
prog = progs[0]
fail(link_xdp["id"] != prog["id"], "Loaded program has wrong ID")
check_verifier_log(err, "[netdevsim] Hello from netdevsim!")
start_test("Test XDP offload is device bound...")
dfs = sim.dfs_get_bound_progs(expected=1)
@ -724,25 +834,32 @@ try:
sim2.set_xdp(obj, "offload")
pin_file, pinned = pin_prog("/sys/fs/bpf/tmp")
ret, _ = sim.set_xdp(pinned, "offload", fail=False)
ret, _, err = sim.set_xdp(pinned, "offload",
fail=False, include_stderr=True)
fail(ret == 0, "Pinned program loaded for a different device accepted")
check_extack_nsim(err, "program bound to different dev.", args)
sim2.remove()
ret, _ = sim.set_xdp(pinned, "offload", fail=False)
ret, _, err = sim.set_xdp(pinned, "offload",
fail=False, include_stderr=True)
fail(ret == 0, "Pinned program loaded for a removed device accepted")
check_extack_nsim(err, "xdpoffload of non-bound program.", args)
rm(pin_file)
bpftool_prog_list_wait(expected=0)
start_test("Test mixing of TC and XDP...")
sim.tc_add_ingress()
sim.set_xdp(obj, "offload")
ret, _ = sim.cls_bpf_add_filter(obj, skip_sw=True, fail=False)
ret, _, err = sim.cls_bpf_add_filter(obj, skip_sw=True,
fail=False, include_stderr=True)
fail(ret == 0, "Loading TC when XDP active should fail")
check_extack_nsim(err, "driver and netdev offload states mismatch.", args)
sim.unset_xdp("offload")
sim.wait_for_flush()
sim.cls_bpf_add_filter(obj, skip_sw=True)
ret, _ = sim.set_xdp(obj, "offload", fail=False)
ret, _, err = sim.set_xdp(obj, "offload", fail=False, include_stderr=True)
fail(ret == 0, "Loading XDP when TC active should fail")
check_extack_nsim(err, "TC program is already loaded.", args)
start_test("Test binding TC from pinned...")
pin_file, pinned = pin_prog("/sys/fs/bpf/tmp")
@ -765,8 +882,10 @@ try:
start_test("Test asking for TC offload of two filters...")
sim.cls_bpf_add_filter(obj, da=True, skip_sw=True)
ret, _ = sim.cls_bpf_add_filter(obj, da=True, skip_sw=True, fail=False)
ret, _, err = sim.cls_bpf_add_filter(obj, da=True, skip_sw=True,
fail=False, include_stderr=True)
fail(ret == 0, "Managed to offload two TC filters at the same time")
check_extack_nsim(err, "driver and netdev offload states mismatch.", args)
sim.tc_flush_filters(bound=2, total=2)