A long long time ago, an effort was made to make tc flower
rtnl_lock() free. However, on the OVS part we forgot to add
the TCA_KIND "flower" attribute, which tell the kernel to skip
the lock. This patch corrects this by adding the attribute for
the delete and get operations.
The kernel code calls tcf_proto_is_unlocked() to determine the
rtnl_lock() is needed for the specific tc protocol. It does this
in the tc_new_tfilter(), tc_del_tfilter(), and in tc_get_tfilter().
If the name is not set, tcf_proto_is_unlocked() will always return
false. If set, the specific protocol is queried for unlocked support.
Fixes: f98e418fbdb6 ("tc: Add tc flower functions")
Signed-off-by: Eelco Chaudron <echau...@redhat.com>
---
lib/netdev-linux.c | 2 +-
lib/netdev-offload-tc.c | 20 ++++++++++----------
lib/tc.c | 10 +++++++++-
lib/tc.h | 3 ++-
4 files changed, 22 insertions(+), 13 deletions(-)
diff --git a/lib/netdev-linux.c b/lib/netdev-linux.c
index f6d7a1b97..65bdd51db 100644
--- a/lib/netdev-linux.c
+++ b/lib/netdev-linux.c
@@ -2735,7 +2735,7 @@ tc_del_matchall_policer(struct netdev *netdev)
}
id = tc_make_tcf_id(ifindex, block_id, prio, TC_INGRESS);
- err = tc_del_filter(&id);
+ err = tc_del_filter(&id, "matchall");
if (err) {
return err;
}
diff --git a/lib/netdev-offload-tc.c b/lib/netdev-offload-tc.c
index ce7f8ad97..2d7e74b1a 100644
--- a/lib/netdev-offload-tc.c
+++ b/lib/netdev-offload-tc.c
@@ -239,7 +239,7 @@ del_filter_and_ufid_mapping(struct tcf_id *id, const
ovs_u128 *ufid)
{
int err;
- err = tc_del_filter(id);
+ err = tc_del_flower_filter(id);
if (!err) {
del_ufid_tc_mapping(ufid);
}
@@ -461,7 +461,7 @@ delete_chains_from_netdev(struct netdev *netdev, struct
tcf_id *id)
*/
HMAP_FOR_EACH_POP (chain_node, node, &map) {
id->chain = chain_node->chain;
- tc_del_filter(id);
+ tc_del_flower_filter(id);
free(chain_node);
}
}
@@ -482,7 +482,7 @@ netdev_tc_flow_flush(struct netdev *netdev)
continue;
}
- err = tc_del_filter(&data->id);
+ err = tc_del_flower_filter(&data->id);
if (!err) {
del_ufid_tc_mapping_unlocked(&data->ufid);
}
@@ -2498,13 +2498,13 @@ probe_multi_mask_per_prio(int ifindex)
id2 = tc_make_tcf_id(ifindex, block_id, prio, TC_INGRESS);
error = tc_replace_flower(&id2, &flower);
- tc_del_filter(&id1);
+ tc_del_flower_filter(&id1);
if (error) {
goto out;
}
- tc_del_filter(&id2);
+ tc_del_flower_filter(&id2);
multi_mask_per_prio = true;
VLOG_INFO("probe tc: multiple masks on single tc prio is supported.");
@@ -2556,7 +2556,7 @@ probe_ct_state_support(int ifindex)
goto out_del;
}
- tc_del_filter(&id);
+ tc_del_flower_filter(&id);
ct_state_support = OVS_CS_F_NEW |
OVS_CS_F_ESTABLISHED |
OVS_CS_F_TRACKED |
@@ -2570,7 +2570,7 @@ probe_ct_state_support(int ifindex)
goto out_del;
}
- tc_del_filter(&id);
+ tc_del_flower_filter(&id);
/* Test for ct_state INVALID support */
memset(&flower, 0, sizeof flower);
@@ -2581,7 +2581,7 @@ probe_ct_state_support(int ifindex)
goto out;
}
- tc_del_filter(&id);
+ tc_del_flower_filter(&id);
ct_state_support |= OVS_CS_F_INVALID;
/* Test for ct_state REPLY support */
@@ -2597,7 +2597,7 @@ probe_ct_state_support(int ifindex)
ct_state_support |= OVS_CS_F_REPLY_DIR;
out_del:
- tc_del_filter(&id);
+ tc_del_flower_filter(&id);
out:
tc_add_del_qdisc(ifindex, false, 0, TC_INGRESS);
VLOG_INFO("probe tc: supported ovs ct_state bits: 0x%x", ct_state_support);
@@ -2750,7 +2750,7 @@ netdev_tc_init_flow_api(struct netdev *netdev)
/* fallback here if delete chains fail */
if (!get_chain_supported) {
- tc_del_filter(&id);
+ tc_del_flower_filter(&id);
}
/* make sure there is no ingress/egress qdisc */
diff --git a/lib/tc.c b/lib/tc.c
index 447ab376e..1fb2b4a92 100644
--- a/lib/tc.c
+++ b/lib/tc.c
@@ -2337,14 +2337,21 @@ parse_netlink_to_tc_policer(struct ofpbuf *reply,
uint32_t police_idx[])
}
int
-tc_del_filter(struct tcf_id *id)
+tc_del_filter(struct tcf_id *id, const char *kind)
{
struct ofpbuf request;
request_from_tcf_id(id, 0, RTM_DELTFILTER, NLM_F_ACK, &request);
+ nl_msg_put_string(&request, TCA_KIND, kind);
return tc_transact(&request, NULL);
}
+int
+tc_del_flower_filter(struct tcf_id *id)
+{
+ return tc_del_filter(id, "flower");
+}
+
int
tc_get_flower(struct tcf_id *id, struct tc_flower *flower)
{
@@ -2353,6 +2360,7 @@ tc_get_flower(struct tcf_id *id, struct tc_flower *flower)
int error;
request_from_tcf_id(id, 0, RTM_GETTFILTER, NLM_F_ECHO, &request);
+ nl_msg_put_string(&request, TCA_KIND, "flower");
error = tc_transact(&request, &reply);
if (error) {
return error;
diff --git a/lib/tc.h b/lib/tc.h
index a828fd3e3..ea4ce806b 100644
--- a/lib/tc.h
+++ b/lib/tc.h
@@ -384,7 +384,8 @@ struct tc_flower {
};
int tc_replace_flower(struct tcf_id *id, struct tc_flower *flower);
-int tc_del_filter(struct tcf_id *id);
+int tc_del_filter(struct tcf_id *id, const char *kind);
+int tc_del_flower_filter(struct tcf_id *id);
int tc_get_flower(struct tcf_id *id, struct tc_flower *flower);
int tc_dump_flower_start(struct tcf_id *id, struct nl_dump *dump, bool terse);
int tc_dump_tc_chain_start(struct tcf_id *id, struct nl_dump *dump);
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