diff mbox series

[net-next,v9,03/15] net/sched: act_api: Update tc_action_ops to account for P4 actions

Message ID 20231201182904.532825-4-jhs@mojatatu.com (mailing list archive)
State Changes Requested
Delegated to: Netdev Maintainers
Headers show
Series Introducing P4TC | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net-next, async
netdev/ynl success Generated files up to date; no warnings/errors;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1173 this patch: 1173
netdev/cc_maintainers success CCed 8 of 8 maintainers
netdev/build_clang success Errors and warnings before: 1143 this patch: 1143
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 1227 this patch: 1227
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 44 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Jamal Hadi Salim Dec. 1, 2023, 6:28 p.m. UTC 
The initialisation of P4TC action instances require access to a struct
p4tc_act (which appears in later patches) to help us to retrieve
information like the P4 action parameters etc. In order to retrieve
struct p4tc_act we need the pipeline name or id and the action name or id.
Also recall that P4TC action IDs are P4 and are net namespace specific.
The init callback from tc_action_ops parameters had no way of
supplying us that information. To solve this issue, we decided to create a
new tc_action_ops callback (init_ops), that provies us with the
tc_action_ops  struct which then provides us with the pipeline and action
name. In addition we add a new refcount to struct tc_action_ops called
dyn_ref, which accounts for how many action instances we have of a specific
action.

Co-developed-by: Victor Nogueira <victor@mojatatu.com>
Signed-off-by: Victor Nogueira <victor@mojatatu.com>
Co-developed-by: Pedro Tammela <pctammela@mojatatu.com>
Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com>
Reviewed-by: Vlad Buslov <vladbu@nvidia.com>
---
 include/net/act_api.h |  6 ++++++
 net/sched/act_api.c   | 14 +++++++++++---
 2 files changed, 17 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/include/net/act_api.h b/include/net/act_api.h
index 4bccc9c59..baba63d02 100644
--- a/include/net/act_api.h
+++ b/include/net/act_api.h
@@ -109,6 +109,7 @@  struct tc_action_ops {
 	char    kind[ACTNAMSIZ];
 	enum tca_id  id; /* identifier should match kind */
 	unsigned int	net_id;
+	refcount_t p4_ref;
 	size_t	size;
 	struct module		*owner;
 	int     (*act)(struct sk_buff *, const struct tc_action *,
@@ -120,6 +121,11 @@  struct tc_action_ops {
 			struct nlattr *est, struct tc_action **act,
 			struct tcf_proto *tp,
 			u32 flags, struct netlink_ext_ack *extack);
+	/* This should be merged with the original init action */
+	int     (*init_ops)(struct net *net, struct nlattr *nla,
+			    struct nlattr *est, struct tc_action **act,
+			   struct tcf_proto *tp, struct tc_action_ops *ops,
+			   u32 flags, struct netlink_ext_ack *extack);
 	int     (*walk)(struct net *, struct sk_buff *,
 			struct netlink_callback *, int,
 			const struct tc_action_ops *,
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index e6792495e..5ab1c75ce 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -1023,7 +1023,7 @@  int tcf_register_action(struct tc_action_ops *act,
 	struct tc_action_ops *a;
 	int ret;
 
-	if (!act->act || !act->dump || !act->init)
+	if (!act->act || !act->dump || (!act->init && !act->init_ops))
 		return -EINVAL;
 
 	/* We have to register pernet ops before making the action ops visible,
@@ -1484,8 +1484,16 @@  struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
 			}
 		}
 
-		err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp,
-				userflags.value | flags, extack);
+		/* When we arrive here we guarantee that a_o->init or
+		 * a_o->init_ops exist.
+		 */
+		if (a_o->init)
+			err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp,
+					userflags.value | flags, extack);
+		else
+			err = a_o->init_ops(net, tb[TCA_ACT_OPTIONS], est, &a,
+					    tp, a_o, userflags.value | flags,
+					    extack);
 	} else {
 		err = a_o->init(net, nla, est, &a, tp, userflags.value | flags,
 				extack);