Re: [PATCH net-next v2] net: Modify mono_delivery_time with clockid_delivery_time

From: Abhishek Chauhan (ABC)
Date: Wed Feb 28 2024 - 15:03:35 EST

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On 2/28/2024 7:53 AM, Willem de Bruijn wrote:
> Abhishek Chauhan wrote:
>> Bridge driver today has no support to forward the userspace timestamp
>> packets and ends up resetting the timestamp. ETF qdisc checks the
>> packet coming from userspace and encounters to be 0 thereby dropping
>> time sensitive packets. These changes will allow userspace timestamps
>> packets to be forwarded from the bridge to NIC drivers.
>>
>> Existing functionality of mono_delivery_time is not altered here
>> instead just extended with userspace tstamp support for bridge
>> forwarding path.
>>
>> Signed-off-by: Abhishek Chauhan <quic_abchauha@xxxxxxxxxxx>
>> ---
>> Changes since v1
>> - Changed the commit subject as i am modifying the mono_delivery_time
>> bit with clockid_delivery_time.
>> - Took care of suggestion mentioned by Willem to use the same bit for
>> userspace delivery time as there are no conflicts between TCP and
>> SCM_TXTIME, because explicit cmsg makes no sense for TCP and only
>> RAW and DGRAM sockets interprets it.
>
> The variable rename churn makes it hard to spot the functional
> changes. Perhaps it makes sense just keep the variable name as is,
> even though the "mono" is not always technically correct anymore.
>

I think a better approach would be to keep the variable as ease and add
comments and documentation in the header file of skbuff.h like
how i have done in this patch. The reason why i say this is
a. We can avoid alot of code churn just to solve this basic problem of
propagating timestamp through forwarding bridge path
b. Re-use the same variable name and have better documentation
c. Complexity will be as minimal as possible.

Let me know what you think.

> Or else to split into two patches. One that renames the field.
> And one that adds the new behavior of setting the bit for SO_TXTIME.
>

Regarding the sidenote. I dont see how they are using clock_id to determine
if the skb->tstamp is set in monotonic. Please correct me or point me to
the piece of code which is doing so.

I hope the check against sock_flag is a better implementation as
it clearly stats and is inline with the implementation that the tstamp is
coming from userspace.
skb->mono_delivery_time = sock_flag(sk, SOCK_TXTIME);

> Sidenote: with sk_clockid, FQ could detect when skb->tstamp is not
> set in monotonic (i.e., set by SO_TXTIME) and drop the packet or
> ignore the embedded timestamp, warn, etc.
>
>> - Clear explaination of why this is needed mentioned below and this
>> is extending the work done by Martin for mono_delivery_time
>> https://patchwork.kernel.org/project/netdevbpf/patch/20220302195525.3480280-1-kafai@xxxxxx/
>> - Version 1 patch can be referenced with below link which states
>> the exact problem with tc-etf and discussions which took place
>> https://lore.kernel.org/all/20240215215632.2899370-1-quic_abchauha@xxxxxxxxxxx/
>>
>> include/linux/skbuff.h | 22 +++++++++++++---------
>> net/bridge/netfilter/nf_conntrack_bridge.c | 2 +-
>> net/core/dev.c | 2 +-
>> net/core/filter.c | 6 +++---
>> net/ieee802154/6lowpan/reassembly.c | 2 +-
>> net/ipv4/inet_fragment.c | 2 +-
>> net/ipv4/ip_fragment.c | 2 +-
>> net/ipv4/ip_output.c | 13 +++++++++++--
>> net/ipv4/raw.c | 9 +++++++++
>> net/ipv6/ip6_output.c | 12 ++++++++++--
>> net/ipv6/netfilter.c | 2 +-
>> net/ipv6/netfilter/nf_conntrack_reasm.c | 2 +-
>> net/ipv6/raw.c | 10 +++++++++-
>> net/ipv6/reassembly.c | 2 +-
>> net/sched/act_bpf.c | 4 ++--
>> net/sched/cls_bpf.c | 4 ++--
>> 16 files changed, 67 insertions(+), 29 deletions(-)
>>
>> diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
>> index 2dde34c29203..24a34d56cfa3 100644
>> --- a/include/linux/skbuff.h
>> +++ b/include/linux/skbuff.h
>> @@ -816,10 +816,14 @@ typedef unsigned char *sk_buff_data_t;
>> * @dst_pending_confirm: need to confirm neighbour
>> * @decrypted: Decrypted SKB
>> * @slow_gro: state present at GRO time, slower prepare step required
>> - * @mono_delivery_time: When set, skb->tstamp has the
>> + * @clockid_delivery_time: When set, skb->tstamp has the
>> * delivery_time in mono clock base (i.e. EDT). Otherwise, the
>
> This is not true anymore. Perhaps "delivery_time in sk_clockid clock base"
>
>> * skb->tstamp has the (rcv) timestamp at ingress and
>> * delivery_time at egress.
>> + * This bit is also set if the tstamp is set from userspace which
>> + * acts as an information in the bridge forwarding path to net
>> + * reset the tstamp value when user sets the timestamp using
>> + * SO_TXTIME sockopts
>> * @napi_id: id of the NAPI struct this skb came from
>> * @sender_cpu: (aka @napi_id) source CPU in XPS
>> * @alloc_cpu: CPU which did the skb allocation.
>> @@ -950,7 +954,7 @@ struct sk_buff {
>> /* private: */
>> __u8 __mono_tc_offset[0];
>> /* public: */
>> - __u8 mono_delivery_time:1; /* See SKB_MONO_DELIVERY_TIME_MASK */
>> + __u8 clockid_delivery_time:1; /* See SKB_MONO_DELIVERY_TIME_MASK */
>> #ifdef CONFIG_NET_XGRESS
>> __u8 tc_at_ingress:1; /* See TC_AT_INGRESS_MASK */
>> __u8 tc_skip_classify:1;
>> @@ -4172,7 +4176,7 @@ static inline void skb_get_new_timestampns(const struct sk_buff *skb,
>> static inline void __net_timestamp(struct sk_buff *skb)
>> {
>> skb->tstamp = ktime_get_real();
>> - skb->mono_delivery_time = 0;
>> + skb->clockid_delivery_time = 0;
>> }
>>
>> static inline ktime_t net_timedelta(ktime_t t)
>> @@ -4184,7 +4188,7 @@ static inline void skb_set_delivery_time(struct sk_buff *skb, ktime_t kt,
>> bool mono)
>> {
>> skb->tstamp = kt;
>> - skb->mono_delivery_time = kt && mono;
>> + skb->clockid_delivery_time = kt && mono;
>> }
>>
>> DECLARE_STATIC_KEY_FALSE(netstamp_needed_key);
>> @@ -4194,8 +4198,8 @@ DECLARE_STATIC_KEY_FALSE(netstamp_needed_key);
>> */
>> static inline void skb_clear_delivery_time(struct sk_buff *skb)
>> {
>> - if (skb->mono_delivery_time) {
>> - skb->mono_delivery_time = 0;
>> + if (skb->clockid_delivery_time) {
>> + skb->clockid_delivery_time = 0;
>> if (static_branch_unlikely(&netstamp_needed_key))
>> skb->tstamp = ktime_get_real();
>> else
>> @@ -4205,7 +4209,7 @@ static inline void skb_clear_delivery_time(struct sk_buff *skb)
>>
>> static inline void skb_clear_tstamp(struct sk_buff *skb)
>> {
>> - if (skb->mono_delivery_time)
>> + if (skb->clockid_delivery_time)
>> return;
>>
>> skb->tstamp = 0;
>> @@ -4213,7 +4217,7 @@ static inline void skb_clear_tstamp(struct sk_buff *skb)
>>
>> static inline ktime_t skb_tstamp(const struct sk_buff *skb)
>> {
>> - if (skb->mono_delivery_time)
>> + if (skb->clockid_delivery_time)
>> return 0;
>>
>> return skb->tstamp;
>> @@ -4221,7 +4225,7 @@ static inline ktime_t skb_tstamp(const struct sk_buff *skb)
>>
>> static inline ktime_t skb_tstamp_cond(const struct sk_buff *skb, bool cond)
>> {
>> - if (!skb->mono_delivery_time && skb->tstamp)
>> + if (!skb->clockid_delivery_time && skb->tstamp)
>> return skb->tstamp;
>>
>> if (static_branch_unlikely(&netstamp_needed_key) || cond)
>> diff --git a/net/bridge/netfilter/nf_conntrack_bridge.c b/net/bridge/netfilter/nf_conntrack_bridge.c
>> index abb090f94ed2..cfc9eeaf23fb 100644
>> --- a/net/bridge/netfilter/nf_conntrack_bridge.c
>> +++ b/net/bridge/netfilter/nf_conntrack_bridge.c
>> @@ -32,7 +32,7 @@ static int nf_br_ip_fragment(struct net *net, struct sock *sk,
>> struct sk_buff *))
>> {
>> int frag_max_size = BR_INPUT_SKB_CB(skb)->frag_max_size;
>> - bool mono_delivery_time = skb->mono_delivery_time;
>> + bool mono_delivery_time = skb->clockid_delivery_time;
>> unsigned int hlen, ll_rs, mtu;
>> ktime_t tstamp = skb->tstamp;
>> struct ip_frag_state state;
>> diff --git a/net/core/dev.c b/net/core/dev.c
>> index bd230ce8fa79..2d6556444f55 100644
>> --- a/net/core/dev.c
>> +++ b/net/core/dev.c
>> @@ -2137,7 +2137,7 @@ EXPORT_SYMBOL(net_disable_timestamp);
>> static inline void net_timestamp_set(struct sk_buff *skb)
>> {
>> skb->tstamp = 0;
>> - skb->mono_delivery_time = 0;
>> + skb->clockid_delivery_time = 0;
>> if (static_branch_unlikely(&netstamp_needed_key))
>> skb->tstamp = ktime_get_real();
>> }
>> diff --git a/net/core/filter.c b/net/core/filter.c
>> index 524adf1fa6d0..c653cff185cb 100644
>> --- a/net/core/filter.c
>> +++ b/net/core/filter.c
>> @@ -7698,13 +7698,13 @@ BPF_CALL_3(bpf_skb_set_tstamp, struct sk_buff *, skb,
>> if (!tstamp)
>> return -EINVAL;
>> skb->tstamp = tstamp;
>> - skb->mono_delivery_time = 1;
>> + skb->clockid_delivery_time = 1;
>> break;
>> case BPF_SKB_TSTAMP_UNSPEC:
>> if (tstamp)
>> return -EINVAL;
>> skb->tstamp = 0;
>> - skb->mono_delivery_time = 0;
>> + skb->clockid_delivery_time = 0;
>> break;
>> default:
>> return -EINVAL;
>> @@ -9413,7 +9413,7 @@ static struct bpf_insn *bpf_convert_tstamp_read(const struct bpf_prog *prog,
>> TC_AT_INGRESS_MASK | SKB_MONO_DELIVERY_TIME_MASK);
>> *insn++ = BPF_JMP32_IMM(BPF_JNE, tmp_reg,
>> TC_AT_INGRESS_MASK | SKB_MONO_DELIVERY_TIME_MASK, 2);
>> - /* skb->tc_at_ingress && skb->mono_delivery_time,
>> + /* skb->tc_at_ingress && skb->clockid_delivery_time,
>> * read 0 as the (rcv) timestamp.
>> */
>> *insn++ = BPF_MOV64_IMM(value_reg, 0);
>> diff --git a/net/ieee802154/6lowpan/reassembly.c b/net/ieee802154/6lowpan/reassembly.c
>> index 6dd960ec558c..651ca0a81e61 100644
>> --- a/net/ieee802154/6lowpan/reassembly.c
>> +++ b/net/ieee802154/6lowpan/reassembly.c
>> @@ -130,7 +130,7 @@ static int lowpan_frag_queue(struct lowpan_frag_queue *fq,
>> goto err;
>>
>> fq->q.stamp = skb->tstamp;
>> - fq->q.mono_delivery_time = skb->mono_delivery_time;
>> + fq->q.mono_delivery_time = skb->clockid_delivery_time;
>> if (frag_type == LOWPAN_DISPATCH_FRAG1)
>> fq->q.flags |= INET_FRAG_FIRST_IN;
>>
>> diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c
>> index 7072fc0783ef..71958ea6ffd6 100644
>> --- a/net/ipv4/inet_fragment.c
>> +++ b/net/ipv4/inet_fragment.c
>> @@ -578,7 +578,7 @@ void inet_frag_reasm_finish(struct inet_frag_queue *q, struct sk_buff *head,
>> skb_mark_not_on_list(head);
>> head->prev = NULL;
>> head->tstamp = q->stamp;
>> - head->mono_delivery_time = q->mono_delivery_time;
>> + head->clockid_delivery_time = q->mono_delivery_time;
>> }
>> EXPORT_SYMBOL(inet_frag_reasm_finish);
>>
>> diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
>> index a4941f53b523..6f41fdfda84e 100644
>> --- a/net/ipv4/ip_fragment.c
>> +++ b/net/ipv4/ip_fragment.c
>> @@ -355,7 +355,7 @@ static int ip_frag_queue(struct ipq *qp, struct sk_buff *skb)
>> qp->iif = dev->ifindex;
>>
>> qp->q.stamp = skb->tstamp;
>> - qp->q.mono_delivery_time = skb->mono_delivery_time;
>> + qp->q.mono_delivery_time = skb->clockid_delivery_time;
>> qp->q.meat += skb->len;
>> qp->ecn |= ecn;
>> add_frag_mem_limit(qp->q.fqdir, skb->truesize);
>> diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
>> index 5b5a0adb927f..1b31171b58a4 100644
>> --- a/net/ipv4/ip_output.c
>> +++ b/net/ipv4/ip_output.c
>> @@ -764,7 +764,7 @@ int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
>> {
>> struct iphdr *iph;
>> struct sk_buff *skb2;
>> - bool mono_delivery_time = skb->mono_delivery_time;
>> + bool mono_delivery_time = skb->clockid_delivery_time;
>> struct rtable *rt = skb_rtable(skb);
>> unsigned int mtu, hlen, ll_rs;
>> struct ip_fraglist_iter iter;
>> @@ -1455,6 +1455,15 @@ struct sk_buff *__ip_make_skb(struct sock *sk,
>> skb->priority = (cork->tos != -1) ? cork->priority: READ_ONCE(sk->sk_priority);
>> skb->mark = cork->mark;
>> skb->tstamp = cork->transmit_time;
>> + /* TX timestamp from userspace can be set by setting SO_TXTIME flag
>> + * Once userspace sets the SO_TXTIME flag internally SOCK_TXTIME is set
>> + * So we are setting the clockid_delivery_time based on if SOCK_TXTIME is
>> + * set or not.
>> + * Note:- the reason why we cannot use clockid to set the bool flag
>> + * is because if userspace sets Monotonic clocks the macro value for
>> + * monotonic clocks is 0 and !!clockid will return 0 for monotonic.
>> + */
>
> Let's avoid such long comments duplicated across multiple locations.
>
>> + skb->clockid_delivery_time = sock_flag(sk, SOCK_TXTIME);
>
> skb->clockid_delivery_time = !!cork->transmit_time;
>
>> /*
>> * Steal rt from cork.dst to avoid a pair of atomic_inc/atomic_dec
>> * on dst refcount
>> @@ -1646,7 +1655,7 @@ void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb,
>> arg->csumoffset) = csum_fold(csum_add(nskb->csum,
>> arg->csum));
>> nskb->ip_summed = CHECKSUM_NONE;
>> - nskb->mono_delivery_time = !!transmit_time;
>> + nskb->clockid_delivery_time = !!transmit_time;
>> if (txhash)
>> skb_set_hash(nskb, txhash, PKT_HASH_TYPE_L4);
>> ip_push_pending_frames(sk, &fl4);
>> diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
>> index aea89326c697..6ade217c4251 100644
>> --- a/net/ipv4/raw.c
>> +++ b/net/ipv4/raw.c
>> @@ -353,6 +353,15 @@ static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
>> skb->priority = READ_ONCE(sk->sk_priority);
>> skb->mark = sockc->mark;
>> skb->tstamp = sockc->transmit_time;
>> + /* TX timestamp from userspace can be set by setting SO_TXTIME flag
>> + * Once userspace sets the SO_TXTIME flag internally SOCK_TXTIME is set
>> + * So we are setting the clockid_delivery_time based on if SOCK_TXTIME is
>> + * set or not.
>> + * Note:- the reason why we cannot use clockid to set the bool flag
>> + * is because if userspace sets Monotonic clocks the macro value for
>> + * monotonic clocks is 0 and !!clockid will return 0 for monotonic.
>> + */
>> + skb->clockid_delivery_time = sock_flag(sk, SOCK_TXTIME);
>> skb_dst_set(skb, &rt->dst);
>> *rtp = NULL;
>>
>> diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
>> index a722a43dd668..e4548e395c3d 100644
>> --- a/net/ipv6/ip6_output.c
>> +++ b/net/ipv6/ip6_output.c
>> @@ -859,7 +859,7 @@ int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
>> struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
>> struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
>> inet6_sk(skb->sk) : NULL;
>> - bool mono_delivery_time = skb->mono_delivery_time;
>> + bool mono_delivery_time = skb->clockid_delivery_time;
>> struct ip6_frag_state state;
>> unsigned int mtu, hlen, nexthdr_offset;
>> ktime_t tstamp = skb->tstamp;
>> @@ -1922,7 +1922,15 @@ struct sk_buff *__ip6_make_skb(struct sock *sk,
>> skb->priority = READ_ONCE(sk->sk_priority);
>> skb->mark = cork->base.mark;
>> skb->tstamp = cork->base.transmit_time;
>> -
>> + /* TX timestamp from userspace can be set by setting SO_TXTIME flag
>> + * Once userspace sets the SO_TXTIME flag internally SOCK_TXTIME is set
>> + * So we are setting the clockid_delivery_time based on if SOCK_TXTIME is
>> + * set or not.
>> + * Note:- the reason why we cannot use clockid to set the bool flag
>> + * is because if userspace sets Monotonic clocks the macro value for
>> + * monotonic clocks is 0 and !!clockid will return 0 for monotonic.
>> + */
>> + skb->clockid_delivery_time = sock_flag(sk, SOCK_TXTIME);
>> ip6_cork_steal_dst(skb, cork);
>> IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS);
>> if (proto == IPPROTO_ICMPV6) {
>> diff --git a/net/ipv6/netfilter.c b/net/ipv6/netfilter.c
>> index 53d255838e6a..33bc6b0f3b13 100644
>> --- a/net/ipv6/netfilter.c
>> +++ b/net/ipv6/netfilter.c
>> @@ -126,7 +126,7 @@ int br_ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
>> struct sk_buff *))
>> {
>> int frag_max_size = BR_INPUT_SKB_CB(skb)->frag_max_size;
>> - bool mono_delivery_time = skb->mono_delivery_time;
>> + bool mono_delivery_time = skb->clockid_delivery_time;
>> ktime_t tstamp = skb->tstamp;
>> struct ip6_frag_state state;
>> u8 *prevhdr, nexthdr = 0;
>> diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
>> index b2dd48911c8d..65cdc41c2bba 100644
>> --- a/net/ipv6/netfilter/nf_conntrack_reasm.c
>> +++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
>> @@ -264,7 +264,7 @@ static int nf_ct_frag6_queue(struct frag_queue *fq, struct sk_buff *skb,
>> fq->iif = dev->ifindex;
>>
>> fq->q.stamp = skb->tstamp;
>> - fq->q.mono_delivery_time = skb->mono_delivery_time;
>> + fq->q.mono_delivery_time = skb->clockid_delivery_time;
>> fq->q.meat += skb->len;
>> fq->ecn |= ecn;
>> if (payload_len > fq->q.max_size)
>> diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
>> index 03dbb874c363..1b95ccb50066 100644
>> --- a/net/ipv6/raw.c
>> +++ b/net/ipv6/raw.c
>> @@ -616,7 +616,15 @@ static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
>> skb->priority = READ_ONCE(sk->sk_priority);
>> skb->mark = sockc->mark;
>> skb->tstamp = sockc->transmit_time;
>> -
>> + /* TX timestamp from userspace can be set by setting SO_TXTIME flag
>> + * Once userspace sets the SO_TXTIME flag internally SOCK_TXTIME is set
>> + * So we are setting the clockid_delivery_time based on if SOCK_TXTIME is
>> + * set or not.
>> + * Note:- the reason why we cannot use clockid to set the bool flag
>> + * is because if userspace sets Monotonic clocks the macro value for
>> + * monotonic clocks is 0 and !!clockid will return 0 for monotonic.
>> + */
>> + skb->clockid_delivery_time = sock_flag(sk, SOCK_TXTIME);
>> skb_put(skb, length);
>> skb_reset_network_header(skb);
>> iph = ipv6_hdr(skb);
>> diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
>> index 5ebc47da1000..ad0e6832b199 100644
>> --- a/net/ipv6/reassembly.c
>> +++ b/net/ipv6/reassembly.c
>> @@ -198,7 +198,7 @@ static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb,
>> fq->iif = dev->ifindex;
>>
>> fq->q.stamp = skb->tstamp;
>> - fq->q.mono_delivery_time = skb->mono_delivery_time;
>> + fq->q.mono_delivery_time = skb->clockid_delivery_time;
>> fq->q.meat += skb->len;
>> fq->ecn |= ecn;
>> add_frag_mem_limit(fq->q.fqdir, skb->truesize);
>> diff --git a/net/sched/act_bpf.c b/net/sched/act_bpf.c
>> index 0e3cf11ae5fc..47f46fcb1827 100644
>> --- a/net/sched/act_bpf.c
>> +++ b/net/sched/act_bpf.c
>> @@ -54,8 +54,8 @@ TC_INDIRECT_SCOPE int tcf_bpf_act(struct sk_buff *skb,
>> bpf_compute_data_pointers(skb);
>> filter_res = bpf_prog_run(filter, skb);
>> }
>> - if (unlikely(!skb->tstamp && skb->mono_delivery_time))
>> - skb->mono_delivery_time = 0;
>> + if (unlikely(!skb->tstamp && skb->clockid_delivery_time))
>> + skb->clockid_delivery_time = 0;
>> if (skb_sk_is_prefetched(skb) && filter_res != TC_ACT_OK)
>> skb_orphan(skb);
>>
>> diff --git a/net/sched/cls_bpf.c b/net/sched/cls_bpf.c
>> index 5e83e890f6a4..fc85a7619f07 100644
>> --- a/net/sched/cls_bpf.c
>> +++ b/net/sched/cls_bpf.c
>> @@ -104,8 +104,8 @@ TC_INDIRECT_SCOPE int cls_bpf_classify(struct sk_buff *skb,
>> bpf_compute_data_pointers(skb);
>> filter_res = bpf_prog_run(prog->filter, skb);
>> }
>> - if (unlikely(!skb->tstamp && skb->mono_delivery_time))
>> - skb->mono_delivery_time = 0;
>> + if (unlikely(!skb->tstamp && skb->clockid_delivery_time))
>> + skb->clockid_delivery_time = 0;
>>
>> if (prog->exts_integrated) {
>> res->class = 0;
>> --
>> 2.25.1
>>
>
>

Next message: Andy Shevchenko: "[PATCH wireless-next v1 1/1] wifi: mt76: mt7915: Remove unused of_gpio.h"
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