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Date: Thu, 16 Nov 2023 17:28:15 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Jamal Hadi Salim <jhs@...atatu.com>
Cc: netdev@...r.kernel.org, deb.chatterjee@...el.com,
	anjali.singhai@...el.com, namrata.limaye@...el.com, tom@...anda.io,
	mleitner@...hat.com, Mahesh.Shirshyad@....com,
	tomasz.osinski@...el.com, xiyou.wangcong@...il.com,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, vladbu@...dia.com, horms@...nel.org,
	daniel@...earbox.net, bpf@...r.kernel.org, khalidm@...dia.com,
	toke@...hat.com, mattyk@...dia.com
Subject: Re: [PATCH net-next v8 10/15] p4tc: add action template create,
 update, delete, get, flush and dump

Thu, Nov 16, 2023 at 03:59:43PM CET, jhs@...atatu.com wrote:

[...]


>diff --git a/include/net/act_api.h b/include/net/act_api.h
>index cd5a8e86f..b95a9bc29 100644
>--- a/include/net/act_api.h
>+++ b/include/net/act_api.h
>@@ -70,6 +70,7 @@ struct tc_action {
> #define TCA_ACT_FLAGS_AT_INGRESS	(1U << (TCA_ACT_FLAGS_USER_BITS + 4))
> #define TCA_ACT_FLAGS_PREALLOC	(1U << (TCA_ACT_FLAGS_USER_BITS + 5))
> #define TCA_ACT_FLAGS_UNREFERENCED	(1U << (TCA_ACT_FLAGS_USER_BITS + 6))
>+#define TCA_ACT_FLAGS_FROM_P4TC	(1U << (TCA_ACT_FLAGS_USER_BITS + 7))
> 
> /* Update lastuse only if needed, to avoid dirtying a cache line.
>  * We use a temp variable to avoid fetching jiffies twice.
>diff --git a/include/net/p4tc.h b/include/net/p4tc.h
>index ccb54d842..68b00fa72 100644
>--- a/include/net/p4tc.h
>+++ b/include/net/p4tc.h
>@@ -9,17 +9,23 @@
> #include <linux/refcount.h>
> #include <linux/rhashtable.h>
> #include <linux/rhashtable-types.h>
>+#include <net/tc_act/p4tc.h>
>+#include <net/p4tc_types.h>
> 
> #define P4TC_DEFAULT_NUM_TABLES P4TC_MINTABLES_COUNT
> #define P4TC_DEFAULT_MAX_RULES 1
> #define P4TC_PATH_MAX 3
>+#define P4TC_MAX_TENTRIES 33554432

Seeing define like this one always makes me happier. Where does it come
from? Why not 0x2000000 at least?


> 
> #define P4TC_KERNEL_PIPEID 0
> 
> #define P4TC_PID_IDX 0
>+#define P4TC_AID_IDX 1
>+#define P4TC_PARSEID_IDX 1
> 
> struct p4tc_dump_ctx {
> 	u32 ids[P4TC_PATH_MAX];
>+	struct rhashtable_iter *iter;
> };
> 
> struct p4tc_template_common;
>@@ -63,8 +69,10 @@ extern const struct p4tc_template_ops p4tc_pipeline_ops;
> 
> struct p4tc_pipeline {
> 	struct p4tc_template_common common;
>+	struct idr                  p_act_idr;
> 	struct rcu_head             rcu;
> 	struct net                  *net;
>+	u32                         num_created_acts;
> 	/* Accounts for how many entities are referencing this pipeline.
> 	 * As for now only P4 filters can refer to pipelines.
> 	 */
>@@ -109,18 +117,157 @@ p4tc_pipeline_find_byany_unsealed(struct net *net, const char *p_name,
> 				  const u32 pipeid,
> 				  struct netlink_ext_ack *extack);
> 
>+struct p4tc_act *tcf_p4_find_act(struct net *net,
>+				 const struct tc_action_ops *a_o,
>+				 struct netlink_ext_ack *extack);
>+void
>+tcf_p4_put_prealloc_act(struct p4tc_act *act, struct tcf_p4act *p4_act);
>+
> static inline int p4tc_action_destroy(struct tc_action **acts)
> {
>+	struct tc_action *acts_non_prealloc[TCA_ACT_MAX_PRIO] = {NULL};
> 	int ret = 0;
> 
> 	if (acts) {
>-		ret = tcf_action_destroy(acts, TCA_ACT_UNBIND);
>+		int j = 0;
>+		int i;

Move declarations to the beginning of the if body.

[...]


>diff --git a/include/uapi/linux/p4tc.h b/include/uapi/linux/p4tc.h
>index 4d33f44c1..7b89229a7 100644
>--- a/include/uapi/linux/p4tc.h
>+++ b/include/uapi/linux/p4tc.h
>@@ -4,6 +4,7 @@
> 
> #include <linux/types.h>
> #include <linux/pkt_sched.h>
>+#include <linux/pkt_cls.h>
> 
> /* pipeline header */
> struct p4tcmsg {
>@@ -17,9 +18,12 @@ struct p4tcmsg {
> #define P4TC_MSGBATCH_SIZE 16
> 
> #define P4TC_MAX_KEYSZ 512
>+#define P4TC_DEFAULT_NUM_PREALLOC 16
> 
> #define TEMPLATENAMSZ 32
> #define PIPELINENAMSIZ TEMPLATENAMSZ
>+#define ACTTMPLNAMSIZ TEMPLATENAMSZ
>+#define ACTPARAMNAMSIZ TEMPLATENAMSZ

Prefix? This is uapi. Could you please be more careful with naming at
least in the uapi area?


[...]


>diff --git a/net/sched/p4tc/p4tc_action.c b/net/sched/p4tc/p4tc_action.c
>new file mode 100644
>index 000000000..19db0772c
>--- /dev/null
>+++ b/net/sched/p4tc/p4tc_action.c
>@@ -0,0 +1,2242 @@
>+// SPDX-License-Identifier: GPL-2.0-or-later
>+/*
>+ * net/sched/p4tc_action.c	P4 TC ACTION TEMPLATES
>+ *
>+ * Copyright (c) 2022-2023, Mojatatu Networks
>+ * Copyright (c) 2022-2023, Intel Corporation.
>+ * Authors:     Jamal Hadi Salim <jhs@...atatu.com>
>+ *              Victor Nogueira <victor@...atatu.com>
>+ *              Pedro Tammela <pctammela@...atatu.com>
>+ */
>+
>+#include <linux/err.h>
>+#include <linux/errno.h>
>+#include <linux/init.h>
>+#include <linux/kernel.h>
>+#include <linux/kmod.h>
>+#include <linux/list.h>
>+#include <linux/module.h>
>+#include <linux/netdevice.h>
>+#include <linux/skbuff.h>
>+#include <linux/slab.h>
>+#include <linux/string.h>
>+#include <linux/types.h>
>+#include <net/flow_offload.h>
>+#include <net/net_namespace.h>
>+#include <net/netlink.h>
>+#include <net/pkt_cls.h>
>+#include <net/p4tc.h>
>+#include <net/sch_generic.h>
>+#include <net/sock.h>
>+#include <net/tc_act/p4tc.h>
>+
>+static LIST_HEAD(dynact_list);
>+
>+#define SEPARATOR "/"

Prefix? Btw, why exactly do you need this. It is used only once.

To quote a few function names in this file:

>+static void set_param_indices(struct idr *params_idr)
>+static void generic_free_param_value(struct p4tc_act_param *param)
>+static int dev_init_param_value(struct net *net, struct p4tc_act_param_ops *op,
>+static void dev_free_param_value(struct p4tc_act_param *param)
>+static void tcf_p4_act_params_destroy_rcu(struct rcu_head *head)
>+static int __tcf_p4_dyna_init_set(struct p4tc_act *act, struct tc_action **a,
>+static int tcf_p4_dyna_template_init(struct net *net, struct tc_action **a,
>+init_prealloc_param(struct p4tc_act *act, struct idr *params_idr,
>+static void p4tc_param_put(struct p4tc_act_param *param)
>+static void free_intermediate_param(struct p4tc_act_param *param)
>+static void free_intermediate_params_list(struct list_head *params_list)
>+static int init_prealloc_params(struct p4tc_act *act,
>+struct p4tc_act *p4tc_action_find_byid(struct p4tc_pipeline *pipeline,
>+static void tcf_p4_prealloc_list_add(struct p4tc_act *act_tmpl,
>+static int tcf_p4_prealloc_acts(struct net *net, struct p4tc_act *act,
>+tcf_p4_get_next_prealloc_act(struct p4tc_act *act)
>+void tcf_p4_set_init_flags(struct tcf_p4act *p4act)
>+static void __tcf_p4_put_prealloc_act(struct p4tc_act *act,
>+tcf_p4_put_prealloc_act(struct p4tc_act *act, struct tcf_p4act *p4act)
>+static int generic_dump_param_value(struct sk_buff *skb, struct p4tc_type *type,
>+static int generic_init_param_value(struct p4tc_act_param *nparam,
>+static struct p4tc_act_param *param_find_byname(struct idr *params_idr,
>+tcf_param_find_byany(struct p4tc_act *act,
>+tcf_param_find_byanyattr(struct p4tc_act *act, struct nlattr *name_attr,
>+static int __p4_init_param_type(struct p4tc_act_param *param,
>+static int tcf_p4_act_init_params(struct net *net,
>+static struct p4tc_act *p4tc_action_find_byname(const char *act_name,
>+static int tcf_p4_dyna_init(struct net *net, struct nlattr *nla,
>+static int tcf_act_fill_param_type(struct sk_buff *skb,
>+static void tcf_p4_dyna_cleanup(struct tc_action *a)
>+struct p4tc_act *p4tc_action_find_get(struct p4tc_pipeline *pipeline,
>+p4tc_action_find_byanyattr(struct nlattr *act_name_attr, const u32 a_id,
>+static void p4_put_many_params(struct idr *params_idr)
>+static int p4_init_param_type(struct p4tc_act_param *param,
>+static struct p4tc_act_param *p4_create_param(struct p4tc_act *act,
>+static struct p4tc_act_param *p4_update_param(struct p4tc_act *act,
>+static struct p4tc_act_param *p4_act_init_param(struct p4tc_act *act,
>+static void p4tc_action_net_exit(struct tc_action_net *tn)
>+static void p4_act_params_put(struct p4tc_act *act)
>+static int __tcf_act_put(struct net *net, struct p4tc_pipeline *pipeline,
>+static int _tcf_act_fill_nlmsg(struct net *net, struct sk_buff *skb,
>+static int tcf_act_fill_nlmsg(struct net *net, struct sk_buff *skb,
>+static int tcf_act_flush(struct sk_buff *skb, struct net *net,
>+static void p4tc_params_replace_many(struct p4tc_act *act,
>+				     struct idr *params_idr)
>+static struct p4tc_act *tcf_act_create(struct net *net, struct nlattr **tb,
>+tcf_act_cu(struct net *net, struct nlmsghdr *n, struct nlattr *nla,

Is there some secret key how you name the functions? To me, this looks
completely inconsistent :/



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