From: Jamal Hadi Salim <jhs@mojatatu.com>
To: Edward Cree <ecree@solarflare.com>,
Pablo Neira Ayuso <pablo@netfilter.org>
Cc: netdev <netdev@vger.kernel.org>, Jiri Pirko <jiri@resnulli.us>,
Cong Wang <xiyou.wangcong@gmail.com>
Subject: Re: TC stats / hw offload question
Date: Fri, 26 Apr 2019 08:42:01 -0400 [thread overview]
Message-ID: <eb718924-08b3-90ce-d8f0-3656d851a18b@mojatatu.com> (raw)
In-Reply-To: <e09faf92-c947-5b98-78d3-a37a28c0fc59@solarflare.com>
On 2019-04-26 8:13 a.m., Edward Cree wrote:
> Sure; this block is (still slightly abridged)
>
> if (a->ops && a->ops->stats_update) {
> struct efx_tc_counter_index *ctr;
>
> ctr = efx_tc_flower_get_counter_by_index(efx, a->tcfa_index);
> if (IS_ERR(ctr)) {
> rc = PTR_ERR(ctr);
> goto release;
> }
> act->count = ctr;
> act->count_action_idx = i;
> efx_tc_calculate_count_delta(act);
> }
>
> and we have
>
> struct efx_tc_counter_index {
> u32 tcfa_index;
> struct rhash_head linkage;
> refcount_t ref;
> u32 fw_id;
> };
>
> const static struct rhashtable_params efx_tc_counter_ht_params = {
> .key_len = offsetof(struct efx_tc_counter_index, linkage),
> .key_offset = 0,
> .head_offset = offsetof(struct efx_tc_counter_index, linkage),
> };
>
> static struct efx_tc_counter_index *efx_tc_flower_get_counter_by_index(
> struct efx_nic *efx, u32 idx)
> {
> struct efx_tc_counter_index *ctr, *old;
> long rc;
>
> ctr = kzalloc(sizeof(*ctr), GFP_USER);
> if (!ctr)
> return ERR_PTR(-ENOMEM);
> ctr->tcfa_index = idx;
> old = rhashtable_lookup_get_insert_fast(&efx->tc->counter_ht,
> &ctr->linkage,
> efx_tc_counter_ht_params);
> if (old) {
> /* don't need our new entry */
> kfree(ctr);
> if (!refcount_inc_not_zero(&old->ref))
> return ERR_PTR(-EAGAIN);
> /* existing entry found */
> ctr = old;
> } else {
> rc = efx_tc_flower_allocate_counter(efx);
> if (rc < 0) {
> rhashtable_remove_fast(&efx->tc->counter_ht,
> &ctr->linkage,
> efx_tc_counter_ht_params);
> kfree(ctr);
> return ERR_PTR(rc);
> }
> ctr->fw_id = rc;
> refcount_inc(&ctr->ref);
> }
> return ctr;
> }
>
> Thus if (and only if) two TC actions have the same tcfa_index, they will
> share a single counter in the HW.
> I gathered from a previous conversation with Jamal[1] that that was the
> correct behaviour:
Yes, this is expected behavior. Meters/policers as well used indices to
indicate sharing.
cheers,
jamal
next prev parent reply other threads:[~2019-04-26 12:42 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-05 19:41 TC stats / hw offload question Edward Cree
2019-02-06 2:20 ` Jamal Hadi Salim
2019-02-08 10:26 ` Edward Cree
2019-02-09 17:39 ` Jamal Hadi Salim
2019-02-11 11:44 ` Edward Cree
2019-02-14 12:39 ` Jamal Hadi Salim
2019-02-14 15:17 ` Andy Gospodarek
2019-02-18 18:56 ` Edward Cree
2019-02-18 19:37 ` Edward Cree
2019-04-24 14:05 ` Edward Cree
2019-04-24 14:11 ` Pablo Neira Ayuso
2019-04-24 15:03 ` Edward Cree
2019-04-25 13:23 ` Edward Cree
2019-04-25 22:33 ` Pablo Neira Ayuso
2019-04-26 12:13 ` Edward Cree
2019-04-26 12:42 ` Jamal Hadi Salim [this message]
2019-04-26 18:49 ` Pablo Neira Ayuso
2019-04-29 14:11 ` Edward Cree
2019-04-29 15:21 ` Pablo Neira Ayuso
2019-04-29 16:25 ` Edward Cree
2019-04-29 19:14 ` Pablo Neira Ayuso
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=eb718924-08b3-90ce-d8f0-3656d851a18b@mojatatu.com \
--to=jhs@mojatatu.com \
--cc=ecree@solarflare.com \
--cc=jiri@resnulli.us \
--cc=netdev@vger.kernel.org \
--cc=pablo@netfilter.org \
--cc=xiyou.wangcong@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).