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Date: Fri, 19 Jun 2020 16:14:17 +0300
From: Ido Schimmel <idosch@...sch.org>
To: dsatish <satish.d@...convergence.com>
Cc: davem@...emloft.net, jhs@...atatu.com, xiyou.wangcong@...il.com,
jiri@...nulli.us, kuba@...nel.org, netdev@...r.kernel.org,
simon.horman@...ronome.com, kesavac@...il.com,
prathibha.nagooru@...convergence.com,
intiyaz.basha@...convergence.com, jai.rana@...convergence.com
Subject: Re: [PATCH net-next 2/3] cls_flower: Pass the unmasked key to hw
On Fri, Jun 19, 2020 at 03:11:55PM +0530, dsatish wrote:
> Pass the unmasked key along with the masked key to the hardware.
> This enables hardware to manage its own tables better based on the
> hardware features/capabilities.
How? Which hardware? You did not patch a single driver...
Are you familiar with chain templates? I think it might help:
https://github.com/Mellanox/mlxsw/wiki/ACLs#chain-templates
>
> Signed-off-by: Chandra Kesava <kesavac@...il.com>
> Signed-off-by: Prathibha Nagooru <prathibha.nagooru@...convergence.com>
> Signed-off-by: Satish Dhote <satish.d@...convergence.com>
> ---
> include/net/flow_offload.h | 45 ++++++++++
> net/core/flow_offload.c | 171 +++++++++++++++++++++++++++++++++++++
> net/sched/cls_flower.c | 43 ++++++++++
> 3 files changed, 259 insertions(+)
>
> diff --git a/include/net/flow_offload.h b/include/net/flow_offload.h
> index f2c8311a0433..26c6bd6bdb98 100644
> --- a/include/net/flow_offload.h
> +++ b/include/net/flow_offload.h
> @@ -11,6 +11,8 @@ struct flow_match {
> struct flow_dissector *dissector;
> void *mask;
> void *key;
> + void *unmasked_key;
> + struct flow_dissector *unmasked_key_dissector;
> };
>
> struct flow_match_meta {
> @@ -118,6 +120,49 @@ void flow_rule_match_enc_opts(const struct flow_rule *rule,
> void flow_rule_match_ct(const struct flow_rule *rule,
> struct flow_match_ct *out);
>
> +void flow_rule_match_unmasked_key_meta(const struct flow_rule *rule,
> + struct flow_match_meta *out);
> +void flow_rule_match_unmasked_key_basic(const struct flow_rule *rule,
> + struct flow_match_basic *out);
> +void flow_rule_match_unmasked_key_control(const struct flow_rule *rule,
> + struct flow_match_control *out);
> +void flow_rule_match_unmasked_key_eth_addrs(const struct flow_rule *rule,
> + struct flow_match_eth_addrs *out);
> +void flow_rule_match_unmasked_key_vlan(const struct flow_rule *rule,
> + struct flow_match_vlan *out);
> +void flow_rule_match_unmasked_key_cvlan(const struct flow_rule *rule,
> + struct flow_match_vlan *out);
> +void flow_rule_match_unmasked_key_ipv4_addrs(const struct flow_rule *rule,
> + struct flow_match_ipv4_addrs *out);
> +void flow_rule_match_unmasked_key_ipv6_addrs(const struct flow_rule *rule,
> + struct flow_match_ipv6_addrs *out);
> +void flow_rule_match_unmasked_key_ip(const struct flow_rule *rule,
> + struct flow_match_ip *out);
> +void flow_rule_match_unmasked_key_ports(const struct flow_rule *rule,
> + struct flow_match_ports *out);
> +void flow_rule_match_unmasked_key_tcp(const struct flow_rule *rule,
> + struct flow_match_tcp *out);
> +void flow_rule_match_unmasked_key_icmp(const struct flow_rule *rule,
> + struct flow_match_icmp *out);
> +void flow_rule_match_unmasked_key_mpls(const struct flow_rule *rule,
> + struct flow_match_mpls *out);
> +void flow_rule_match_unmasked_key_enc_control(const struct flow_rule *rule,
> + struct flow_match_control *out);
> +void flow_rule_match_unmasked_key_enc_ipv4_addrs(const struct flow_rule *rule,
> + struct flow_match_ipv4_addrs *out);
> +void flow_rule_match_unmasked_key_enc_ipv6_addrs(const struct flow_rule *rule,
> + struct flow_match_ipv6_addrs *out);
> +void flow_rule_match_unmasked_key_enc_ip(const struct flow_rule *rule,
> + struct flow_match_ip *out);
> +void flow_rule_match_unmasked_key_enc_ports(const struct flow_rule *rule,
> + struct flow_match_ports *out);
> +void flow_rule_match_unmasked_key_enc_keyid(const struct flow_rule *rule,
> + struct flow_match_enc_keyid *out);
> +void flow_rule_match_unmasked_key_enc_opts(const struct flow_rule *rule,
> + struct flow_match_enc_opts *out);
> +void flow_rule_match_unmasked_key_ct(const struct flow_rule *rule,
> + struct flow_match_ct *out);
> +
> enum flow_action_id {
> FLOW_ACTION_ACCEPT = 0,
> FLOW_ACTION_DROP,
> diff --git a/net/core/flow_offload.c b/net/core/flow_offload.c
> index 0cfc35e6be28..a98c31e864b1 100644
> --- a/net/core/flow_offload.c
> +++ b/net/core/flow_offload.c
> @@ -173,6 +173,177 @@ void flow_rule_match_enc_opts(const struct flow_rule *rule,
> }
> EXPORT_SYMBOL(flow_rule_match_enc_opts);
>
> +#define FLOW_UNMASKED_KEY_DISSECTOR_MATCH(__rule, __type, __out) \
> + const struct flow_match *__m = &(__rule)->match; \
> + struct flow_dissector *__d = (__m)->unmasked_key_dissector; \
> + \
> + (__out)->key = skb_flow_dissector_target(__d, __type, \
> + (__m)->unmasked_key); \
> + (__out)->mask = skb_flow_dissector_target(__d, __type, \
> + (__m)->mask) \
> +
> +void flow_rule_match_unmasked_key_meta(const struct flow_rule *rule,
> + struct flow_match_meta *out)
> +{
> + FLOW_UNMASKED_KEY_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_META, out);
> +}
> +EXPORT_SYMBOL(flow_rule_match_unmasked_key_meta);
> +
> +void
> +flow_rule_match_unmasked_key_basic(const struct flow_rule *rule,
> + struct flow_match_basic *out)
> +{
> + FLOW_UNMASKED_KEY_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_BASIC, out);
> +}
> +EXPORT_SYMBOL(flow_rule_match_unmasked_key_basic);
> +
> +void flow_rule_match_unmasked_key_control(const struct flow_rule *rule,
> + struct flow_match_control *out)
> +{
> + FLOW_UNMASKED_KEY_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_CONTROL,
> + out);
> +}
> +EXPORT_SYMBOL(flow_rule_match_unmasked_key_control);
> +
> +void flow_rule_match_unmasked_key_eth_addrs(const struct flow_rule *rule,
> + struct flow_match_eth_addrs *out)
> +{
> + FLOW_UNMASKED_KEY_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS,
> + out);
> +}
> +EXPORT_SYMBOL(flow_rule_match_unmasked_key_eth_addrs);
> +
> +void flow_rule_match_unmasked_key_vlan(const struct flow_rule *rule,
> + struct flow_match_vlan *out)
> +{
> + FLOW_UNMASKED_KEY_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_VLAN, out);
> +}
> +EXPORT_SYMBOL(flow_rule_match_unmasked_key_vlan);
> +
> +void flow_rule_match_unmasked_key_cvlan(const struct flow_rule *rule,
> + struct flow_match_vlan *out)
> +{
> + FLOW_UNMASKED_KEY_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_CVLAN, out);
> +}
> +EXPORT_SYMBOL(flow_rule_match_unmasked_key_cvlan);
> +
> +void flow_rule_match_unmasked_key_ipv4_addrs(const struct flow_rule *rule,
> + struct flow_match_ipv4_addrs *out)
> +{
> + FLOW_UNMASKED_KEY_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_IPV4_ADDRS,
> + out);
> +}
> +EXPORT_SYMBOL(flow_rule_match_unmasked_key_ipv4_addrs);
> +
> +void flow_rule_match_unmasked_key_ipv6_addrs(const struct flow_rule *rule,
> + struct flow_match_ipv6_addrs *out)
> +{
> + FLOW_UNMASKED_KEY_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_IPV6_ADDRS,
> + out);
> +}
> +EXPORT_SYMBOL(flow_rule_match_unmasked_key_ipv6_addrs);
> +
> +void flow_rule_match_unmasked_key_ip(const struct flow_rule *rule,
> + struct flow_match_ip *out)
> +{
> + FLOW_UNMASKED_KEY_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_IP, out);
> +}
> +EXPORT_SYMBOL(flow_rule_match_unmasked_key_ip);
> +
> +void flow_rule_match_unmasked_key_ports(const struct flow_rule *rule,
> + struct flow_match_ports *out)
> +{
> + FLOW_UNMASKED_KEY_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_PORTS, out);
> +}
> +EXPORT_SYMBOL(flow_rule_match_unmasked_key_ports);
> +
> +void flow_rule_match_unmasked_key_tcp(const struct flow_rule *rule,
> + struct flow_match_tcp *out)
> +{
> + FLOW_UNMASKED_KEY_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_TCP, out);
> +}
> +EXPORT_SYMBOL(flow_rule_match_unmasked_key_tcp);
> +
> +void flow_rule_match_unmasked_key_icmp(const struct flow_rule *rule,
> + struct flow_match_icmp *out)
> +{
> + FLOW_UNMASKED_KEY_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ICMP, out);
> +}
> +EXPORT_SYMBOL(flow_rule_match_unmasked_key_icmp);
> +
> +void flow_rule_match_unmasked_key_mpls(const struct flow_rule *rule,
> + struct flow_match_mpls *out)
> +{
> + FLOW_UNMASKED_KEY_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_MPLS, out);
> +}
> +EXPORT_SYMBOL(flow_rule_match_unmasked_key_mpls);
> +
> +void flow_rule_match_unmasked_key_enc_control(const struct flow_rule *rule,
> + struct flow_match_control *out)
> +{
> + FLOW_UNMASKED_KEY_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_CONTROL,
> + out);
> +}
> +EXPORT_SYMBOL(flow_rule_match_unmasked_key_enc_control);
> +
> +void
> +flow_rule_match_unmasked_key_enc_ipv4_addrs(const struct flow_rule *rule,
> + struct flow_match_ipv4_addrs *out)
> +{
> + FLOW_UNMASKED_KEY_DISSECTOR_MATCH(rule,
> + FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS,
> + out);
> +}
> +EXPORT_SYMBOL(flow_rule_match_unmasked_key_enc_ipv4_addrs);
> +
> +void
> +flow_rule_match_unmasked_key_enc_ipv6_addrs(const struct flow_rule *rule,
> + struct flow_match_ipv6_addrs *out)
> +{
> + FLOW_UNMASKED_KEY_DISSECTOR_MATCH(rule,
> + FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS,
> + out);
> +}
> +EXPORT_SYMBOL(flow_rule_match_unmasked_key_enc_ipv6_addrs);
> +
> +void flow_rule_match_unmasked_key_enc_ip(const struct flow_rule *rule,
> + struct flow_match_ip *out)
> +{
> + FLOW_UNMASKED_KEY_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_IP, out);
> +}
> +EXPORT_SYMBOL(flow_rule_match_unmasked_key_enc_ip);
> +
> +void flow_rule_match_unmasked_key_enc_ports(const struct flow_rule *rule,
> + struct flow_match_ports *out)
> +{
> + FLOW_UNMASKED_KEY_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_PORTS,
> + out);
> +}
> +EXPORT_SYMBOL(flow_rule_match_unmasked_key_enc_ports);
> +
> +void flow_rule_match_unmasked_key_enc_keyid(const struct flow_rule *rule,
> + struct flow_match_enc_keyid *out)
> +{
> + FLOW_UNMASKED_KEY_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_KEYID,
> + out);
> +}
> +EXPORT_SYMBOL(flow_rule_match_unmasked_key_enc_keyid);
> +
> +void flow_rule_match_unmasked_key_enc_opts(const struct flow_rule *rule,
> + struct flow_match_enc_opts *out)
> +{
> + FLOW_UNMASKED_KEY_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_OPTS,
> + out);
> +}
> +EXPORT_SYMBOL(flow_rule_match_unmasked_key_enc_opts);
> +
> +void flow_rule_match_unmasked_key_ct(const struct flow_rule *rule,
> + struct flow_match_ct *out)
> +{
> + FLOW_UNMASKED_KEY_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_CT, out);
> +}
> +EXPORT_SYMBOL(flow_rule_match_unmasked_key_ct);
> +
> struct flow_action_cookie *flow_action_cookie_create(void *data,
> unsigned int len,
> gfp_t gfp)
> diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
> index 64b70d396397..f1a5352cbb04 100644
> --- a/net/sched/cls_flower.c
> +++ b/net/sched/cls_flower.c
> @@ -121,6 +121,7 @@ struct cls_fl_filter {
> */
> refcount_t refcnt;
> bool deleted;
> + struct flow_dissector unmasked_key_dissector;
> };
>
> static const struct rhashtable_params mask_ht_params = {
> @@ -449,6 +450,13 @@ static int fl_hw_replace_filter(struct tcf_proto *tp,
> cls_flower.rule->match.key = &f->mkey;
> cls_flower.classid = f->res.classid;
>
> + /* Pass unmasked key and corresponding dissector also to the driver,
> + * hardware may optimize its flow table based on its capabilities.
> + */
> + cls_flower.rule->match.unmasked_key = &f->key;
> + cls_flower.rule->match.unmasked_key_dissector =
> + &f->unmasked_key_dissector;
> +
> err = tc_setup_flow_action(&cls_flower.rule->action, &f->exts);
> if (err) {
> kfree(cls_flower.rule);
> @@ -1753,6 +1761,39 @@ static void fl_init_dissector(struct flow_dissector *dissector,
> skb_flow_dissector_init(dissector, keys, cnt);
> }
>
> +/* Initialize dissector for unmasked key. */
> +static void fl_init_unmasked_key_dissector(struct flow_dissector *dissector)
> +{
> + struct flow_dissector_key keys[FLOW_DISSECTOR_KEY_MAX];
> + size_t cnt = 0;
> +
> + FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_META, meta);
> + FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_CONTROL, control);
> + FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_BASIC, basic);
> + FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_ETH_ADDRS, eth);
> + FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4);
> + FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6);
> + FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_PORTS, tp);
> + FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_PORTS_RANGE, tp_range);
> + FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_IP, ip);
> + FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_TCP, tcp);
> + FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_ICMP, icmp);
> + FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_ARP, arp);
> + FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_MPLS, mpls);
> + FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_VLAN, vlan);
> + FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_CVLAN, cvlan);
> + FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_ENC_KEYID, enc_key_id);
> + FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS, enc_ipv4);
> + FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS, enc_ipv6);
> + FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_ENC_CONTROL, enc_control);
> + FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_ENC_PORTS, enc_tp);
> + FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_ENC_IP, enc_ip);
> + FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_ENC_OPTS, enc_opts);
> + FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_CT, ct);
> +
> + skb_flow_dissector_init(dissector, keys, cnt);
> +}
> +
> static struct fl_flow_mask *fl_create_new_mask(struct cls_fl_head *head,
> struct fl_flow_mask *mask)
> {
> @@ -1980,6 +2021,8 @@ static int fl_change(struct net *net, struct sk_buff *in_skb,
> if (err)
> goto errout;
>
> + fl_init_unmasked_key_dissector(&fnew->unmasked_key_dissector);
> +
> err = fl_ht_insert_unique(fnew, fold, &in_ht);
> if (err)
> goto errout_mask;
> --
> 2.17.1
>
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