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Message-ID: <1d08f20e-a363-4405-ad97-1107cd34628a@mojatatu.com>
Date: Fri, 15 Dec 2023 10:56:48 -0300
From: Victor Nogueira <victor@...atatu.com>
To: Jiri Pirko <jiri@...nulli.us>
Cc: jhs@...atatu.com, davem@...emloft.net, edumazet@...gle.com,
kuba@...nel.org, pabeni@...hat.com, xiyou.wangcong@...il.com,
mleitner@...hat.com, vladbu@...dia.com, paulb@...dia.com,
pctammela@...atatu.com, netdev@...r.kernel.org, kernel@...atatu.com
Subject: Re: [PATCH net-next v7 3/3] net/sched: act_mirred: Allow mirred to
block
On 15/12/2023 10:06, Jiri Pirko wrote:
> Fri, Dec 15, 2023 at 12:10:50PM CET, victor@...atatu.com wrote:
>> So far the mirred action has dealt with syntax that handles mirror/redirection for netdev.
>> A matching packet is redirected or mirrored to a target netdev.
>>
>> In this patch we enable mirred to mirror to a tc block as well.
>> IOW, the new syntax looks as follows:
>> ... mirred <ingress | egress> <mirror | redirect> [index INDEX] < <blockid BLOCKID> | <dev <devname>> >
>>
>> Examples of mirroring or redirecting to a tc block:
>> $ tc filter add block 22 protocol ip pref 25 \
>> flower dst_ip 192.168.0.0/16 action mirred egress mirror blockid 22
>>
>> $ tc filter add block 22 protocol ip pref 25 \
>> flower dst_ip 10.10.10.10/32 action mirred egress redirect blockid 22
>>
>> Co-developed-by: Jamal Hadi Salim <jhs@...atatu.com>
>> Signed-off-by: Jamal Hadi Salim <jhs@...atatu.com>
>> Co-developed-by: Pedro Tammela <pctammela@...atatu.com>
>> Signed-off-by: Pedro Tammela <pctammela@...atatu.com>
>> Signed-off-by: Victor Nogueira <victor@...atatu.com>
>> ---
>> include/net/tc_act/tc_mirred.h | 1 +
>> include/uapi/linux/tc_act/tc_mirred.h | 1 +
>> net/sched/act_mirred.c | 278 +++++++++++++++++++-------
>> 3 files changed, 206 insertions(+), 74 deletions(-)
>>
>> diff --git a/include/net/tc_act/tc_mirred.h b/include/net/tc_act/tc_mirred.h
>> index 32ce8ea36950..75722d967bf2 100644
>> --- a/include/net/tc_act/tc_mirred.h
>> +++ b/include/net/tc_act/tc_mirred.h
>> @@ -8,6 +8,7 @@
>> struct tcf_mirred {
>> struct tc_action common;
>> int tcfm_eaction;
>> + u32 tcfm_blockid;
>> bool tcfm_mac_header_xmit;
>> struct net_device __rcu *tcfm_dev;
>> netdevice_tracker tcfm_dev_tracker;
>> diff --git a/include/uapi/linux/tc_act/tc_mirred.h b/include/uapi/linux/tc_act/tc_mirred.h
>> index 2500a0005d05..54df06658bc8 100644
>> --- a/include/uapi/linux/tc_act/tc_mirred.h
>> +++ b/include/uapi/linux/tc_act/tc_mirred.h
>> @@ -20,6 +20,7 @@ enum {
>> TCA_MIRRED_UNSPEC,
>> TCA_MIRRED_TM,
>> TCA_MIRRED_PARMS,
>> + TCA_MIRRED_BLOCKID,
>
> You just broke uapi. Make sure to add new attributes to the end.
My bad, don't know how we missed this one.
Will fix in v8.
>
>> TCA_MIRRED_PAD,
>> __TCA_MIRRED_MAX
>> };
>> diff --git a/net/sched/act_mirred.c b/net/sched/act_mirred.c
>> index 0a711c184c29..8b6d04d26c5a 100644
>> --- a/net/sched/act_mirred.c
>> +++ b/net/sched/act_mirred.c
>> @@ -85,10 +85,20 @@ static void tcf_mirred_release(struct tc_action *a)
>>
>> static const struct nla_policy mirred_policy[TCA_MIRRED_MAX + 1] = {
>> [TCA_MIRRED_PARMS] = { .len = sizeof(struct tc_mirred) },
>> + [TCA_MIRRED_BLOCKID] = { .type = NLA_U32 },
>> };
>>
>> static struct tc_action_ops act_mirred_ops;
>>
>> +static void tcf_mirred_replace_dev(struct tcf_mirred *m, struct net_device *ndev)
>> +{
>> + struct net_device *odev;
>> +
>> + odev = rcu_replace_pointer(m->tcfm_dev, ndev,
>> + lockdep_is_held(&m->tcf_lock));
>> + netdev_put(odev, &m->tcfm_dev_tracker);
>> +}
>> +
>> static int tcf_mirred_init(struct net *net, struct nlattr *nla,
>> struct nlattr *est, struct tc_action **a,
>> struct tcf_proto *tp,
>> @@ -126,6 +136,13 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
>> if (exists && bind)
>> return 0;
>>
>> + if (tb[TCA_MIRRED_BLOCKID] && parm->ifindex) {
>> + NL_SET_ERR_MSG_MOD(extack,
>> + "Mustn't specify Block ID and dev simultaneously");
>> + err = -EINVAL;
>> + goto release_idr;
>> + }
>> +
>> switch (parm->eaction) {
>> case TCA_EGRESS_MIRROR:
>> case TCA_EGRESS_REDIR:
>> @@ -142,9 +159,9 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
>> }
>>
>> if (!exists) {
>> - if (!parm->ifindex) {
>> + if (!parm->ifindex && !tb[TCA_MIRRED_BLOCKID]) {
>> tcf_idr_cleanup(tn, index);
>> - NL_SET_ERR_MSG_MOD(extack, "Specified device does not exist");
>> + NL_SET_ERR_MSG_MOD(extack, "Must specify device or block");
>> return -EINVAL;
>> }
>> ret = tcf_idr_create_from_flags(tn, index, est, a,
>> @@ -170,7 +187,7 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
>> spin_lock_bh(&m->tcf_lock);
>>
>> if (parm->ifindex) {
>> - struct net_device *odev, *ndev;
>> + struct net_device *ndev;
>>
>> ndev = dev_get_by_index(net, parm->ifindex);
>> if (!ndev) {
>> @@ -179,11 +196,14 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
>> goto put_chain;
>> }
>> mac_header_xmit = dev_is_mac_header_xmit(ndev);
>> - odev = rcu_replace_pointer(m->tcfm_dev, ndev,
>> - lockdep_is_held(&m->tcf_lock));
>> - netdev_put(odev, &m->tcfm_dev_tracker);
>> + tcf_mirred_replace_dev(m, ndev);
>
> This could be a separate patch, for better readability of the patches.
>
> Skimming thought the rest of the patch, this is hard to follow (-ETOOBIG).
> What would help is to cut this patch into multiple ones. Do preparations
> first, then you finally add TCA_MIRRED_BLOCKID processin and blockid
> forwarding. Could you?
Will transform this one into two separate patches.
>
>> netdev_tracker_alloc(ndev, &m->tcfm_dev_tracker, GFP_ATOMIC);
>> m->tcfm_mac_header_xmit = mac_header_xmit;
>> + m->tcfm_blockid = 0;
>> + } else if (tb[TCA_MIRRED_BLOCKID]) {
>> + tcf_mirred_replace_dev(m, NULL);
>> + m->tcfm_mac_header_xmit = false;
>> + m->tcfm_blockid = nla_get_u32(tb[TCA_MIRRED_BLOCKID]);
>> }
>> goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
>> m->tcfm_eaction = parm->eaction;
>
> [...]
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