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Date: Fri, 17 Nov 2023 10:11:29 -0500
From: Jamal Hadi Salim <jhs@...atatu.com>
To: Jiri Pirko <jiri@...nulli.us>
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
On Thu, Nov 16, 2023 at 11:28 AM Jiri Pirko <jiri@...nulli.us> wrote:
>
> 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?
I dont recall why we decided to do decimal - will change it.
>
> >
> > #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.
>
Didnt follow - which specific declaration?
> [...]
>
>
> >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?
Good point.
>
> [...]
>
>
> >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.
>
We'll get rid of it.
> 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 :/
What would be better? tcf_p4_xxxx?
A lot of the tcf_xxx is because that convention is used in that file
but we can change it.
cheers,
jamal
>
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