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[146.241.250.174]) by smtp.gmail.com with ESMTPSA id bp22-20020a5d5a96000000b0033d8b1ace25sm2118674wrb.2.2024.02.29.07.05.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Feb 2024 07:05:38 -0800 (PST) Message-ID: Subject: Re: [PATCH net-next v12 01/15] net: sched: act_api: Introduce P4 actions list From: Paolo Abeni To: Jamal Hadi Salim , netdev@vger.kernel.org Cc: deb.chatterjee@intel.com, anjali.singhai@intel.com, namrata.limaye@intel.com, tom@sipanda.io, mleitner@redhat.com, Mahesh.Shirshyad@amd.com, Vipin.Jain@amd.com, tomasz.osinski@intel.com, jiri@resnulli.us, xiyou.wangcong@gmail.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, vladbu@nvidia.com, horms@kernel.org, khalidm@nvidia.com, toke@redhat.com, daniel@iogearbox.net, victor@mojatatu.com, pctammela@mojatatu.com, bpf@vger.kernel.org Date: Thu, 29 Feb 2024 16:05:36 +0100 In-Reply-To: <20240225165447.156954-2-jhs@mojatatu.com> References: <20240225165447.156954-1-jhs@mojatatu.com> <20240225165447.156954-2-jhs@mojatatu.com> Autocrypt: addr=pabeni@redhat.com; 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charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.4 (3.50.4-1.fc39) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Sun, 2024-02-25 at 11:54 -0500, Jamal Hadi Salim wrote: > In P4 we require to generate new actions "on the fly" based on the > specified P4 action definition. P4 action kinds, like the pipeline > they are attached to, must be per net namespace, as opposed to native > action kinds which are global. For that reason, we chose to create a > separate structure to store P4 actions. >=20 > Co-developed-by: Victor Nogueira > Signed-off-by: Victor Nogueira > Co-developed-by: Pedro Tammela > Signed-off-by: Pedro Tammela > Signed-off-by: Jamal Hadi Salim > Reviewed-by: Vlad Buslov > Reviewed-by: Marcelo Ricardo Leitner > --- > include/net/act_api.h | 8 ++- > net/sched/act_api.c | 123 +++++++++++++++++++++++++++++++++++++----- > net/sched/cls_api.c | 2 +- > 3 files changed, 116 insertions(+), 17 deletions(-) >=20 > diff --git a/include/net/act_api.h b/include/net/act_api.h > index 77ee0c657..f22be14bb 100644 > --- a/include/net/act_api.h > +++ b/include/net/act_api.h > @@ -105,6 +105,7 @@ typedef void (*tc_action_priv_destructor)(void *priv)= ; > =20 > struct tc_action_ops { > struct list_head head; > + struct list_head p4_head; > char kind[IFNAMSIZ]; > enum tca_id id; /* identifier should match kind */ > unsigned int net_id; > @@ -199,10 +200,12 @@ int tcf_idr_check_alloc(struct tc_action_net *tn, u= 32 *index, > int tcf_idr_release(struct tc_action *a, bool bind); > =20 > int tcf_register_action(struct tc_action_ops *a, struct pernet_operation= s *ops); > +int tcf_register_p4_action(struct net *net, struct tc_action_ops *act); > int tcf_unregister_action(struct tc_action_ops *a, > struct pernet_operations *ops); > #define NET_ACT_ALIAS_PREFIX "net-act-" > #define MODULE_ALIAS_NET_ACT(kind) MODULE_ALIAS(NET_ACT_ALIAS_PREFIX kin= d) > +void tcf_unregister_p4_action(struct net *net, struct tc_action_ops *act= ); > int tcf_action_destroy(struct tc_action *actions[], int bind); > int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, > int nr_actions, struct tcf_result *res); > @@ -210,8 +213,9 @@ int tcf_action_init(struct net *net, struct tcf_proto= *tp, struct nlattr *nla, > struct nlattr *est, > struct tc_action *actions[], int init_res[], size_t *attr_size, > u32 flags, u32 fl_flags, struct netlink_ext_ack *extack); > -struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, u32 flags, > - struct netlink_ext_ack *extack); > +struct tc_action_ops * > +tc_action_load_ops(struct net *net, struct nlattr *nla, > + u32 flags, struct netlink_ext_ack *extack); > struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *t= p, > struct nlattr *nla, struct nlattr *est, > struct tc_action_ops *a_o, int *init_res, > diff --git a/net/sched/act_api.c b/net/sched/act_api.c > index 9ee622fb1..23ef394f2 100644 > --- a/net/sched/act_api.c > +++ b/net/sched/act_api.c > @@ -57,6 +57,40 @@ static void tcf_free_cookie_rcu(struct rcu_head *p) > kfree(cookie); > } > =20 > +static unsigned int p4_act_net_id; > + > +struct tcf_p4_act_net { > + struct list_head act_base; > + rwlock_t act_mod_lock; Note that rwlock in networking code is discouraged, as they have to be unfair, see commit 0daf07e527095e64ee8927ce297ab626643e9f51. In this specific case I think there should be no problems, as is extremely hard/impossible to have serious contention on the write side,. Also there is already an existing rwlock nearby, no not a blocker but IMHO worthy to be noted. Cheers, Paolo