DPDK patches and discussions
 help / color / mirror / Atom feed
From: Chas Williams <3chas3@gmail.com>
To: David Marchand <david.marchand@redhat.com>
Cc: dev <dev@dpdk.org>, "Yigit, Ferruh" <ferruh.yigit@intel.com>,
	chas3@att.com, "Zhaohui (zhaohui,
	Polestar)" <zhaohui8@huawei.com>, dpdk stable <stable@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH 2/2] net/bonding: fix oob access in "other" aggregator modes
Date: Sun, 24 Mar 2019 13:24:00 -0400	[thread overview]
Message-ID: <8eb07dc9-0640-66bd-22aa-e8518d449e97@gmail.com> (raw)
Message-ID: <20190324172400.xHfshH0vtlbBMFrp8Bs5AQ7FvQq0b_jKuKwyjZHiqrw@z> (raw)
In-Reply-To: <CAJFAV8wn0VAu41ZriTfUpXs4jLXeLxQz3=rCCOhfrvhNYPc+kQ@mail.gmail.com>



On 3/24/19 1:11 PM, David Marchand wrote:
> On Sun, Mar 24, 2019 at 2:35 PM Chas Williams <3chas3@gmail.com 
> <mailto:3chas3@gmail.com>> wrote:
> 
>     Have you ever experienced this problem in practice? I ask because I am
>     considering some fixes that would limit the number of slaves to a more
>     reasonable number (and reduce the over stack usage of the bonding
>     driver
>     in general).
> 
> 
> Not too hard to reproduce, the problem is not the number of slaves.
> With a default RTE_MAX_ETHPORTS at 32, any slave whose portid >= 8 would 
> trigger an oob access.
Err... Well I have a lot of questions then about this whole thing.  What 
is max_index() doing?

                 mode_count_id = max_index(agg_count, slaves_count);

It's indexing up to slaves_count, which is likely to be somewhere around 
2. agg_count() is indexed by the port id. It's likely agg_count was 
intended to be indexed by the slave index and not the port id.

> 
> 
> Example:
> # git describe
> v19.02-294-gad2f555
> 
> # gdb ./master/app/testpmd
> (gdb) b selection_logic
> (gdb) run -c 0x3 --no-pci --vdev net_ring0 --vdev net_ring1 --vdev 
> net_ring2 --vdev net_ring3 --vdev net_ring4 --vdev net_ring5 --vdev 
> net_ring6 --vdev net_ring7 --vdev net_ring8 --vdev net_ring9 --vdev 
> net_bonding0,mode=4,slave=8,slave=9 -- -i --total-num-mbufs 2048
> 
> Breakpoint 1, selection_logic (internals=0x17fe51980, slave_id=8) at 
> /root/dpdk/drivers/net/bonding/rte_eth_bond_8023ad.c:670
> 670        uint16_t slaves_count, new_agg_id, i, j = 0;
> Missing separate debuginfos, use: debuginfo-install 
> glibc-2.17-260.el7_6.3.x86_64 libgcc-4.8.5-36.el7.x86_64 
> numactl-libs-2.0.9-7.el7.x86_64
> (gdb) n
> 672        uint64_t agg_bandwidth[8] = {0};
> (gdb)
> 673        uint64_t agg_count[8] = {0};
> (gdb)
> 674        uint16_t default_slave = 0;
> (gdb) p agg_bandwidth
> $1 = {0, 0, 0, 0, 0, 0, 0, 0}
> (gdb) p agg_count
> $2 = {0, 0, 0, 0, 0, 0, 0, 0}
> (gdb) n
> 678        slaves = internals->active_slaves;
> (gdb)
> 679        slaves_count = internals->active_slave_count;
> (gdb)
> 680        port = &bond_mode_8023ad_ports[slave_id];
> (gdb)
> 683        for (i = 0; i < slaves_count; ++i) {
> (gdb)
> 684            agg = &bond_mode_8023ad_ports[slaves[i]];
> (gdb)
> 686            if (agg->aggregator_port_id != slaves[i])
> (gdb)
> 689            agg_count[agg->aggregator_port_id] += 1;
> (gdb)
> 690            rte_eth_link_get_nowait(slaves[i], &link_info);
> (gdb) p agg_bandwidth
> $3 = {1, 0, 0, 0, 0, 0, 0, 0}
> (gdb) p agg_count
> $4 = {0, 0, 0, 0, 0, 0, 0, 0}
> 
> 
> -- 
> David Marchand

  parent reply	other threads:[~2019-03-24 17:24 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-21 20:28 [dpdk-dev] [PATCH 1/2] net/bonding: fix more incorrect slave id types David Marchand
2019-03-21 20:28 ` David Marchand
2019-03-21 20:28 ` [dpdk-dev] [PATCH 2/2] net/bonding: fix oob access in "other" aggregator modes David Marchand
2019-03-21 20:28   ` David Marchand
2019-03-22 11:18   ` Maxime Coquelin
2019-03-22 11:18     ` Maxime Coquelin
2019-03-24 13:35   ` Chas Williams
2019-03-24 13:35     ` Chas Williams
2019-03-24 17:11     ` David Marchand
2019-03-24 17:11       ` David Marchand
2019-03-24 17:24       ` Chas Williams [this message]
2019-03-24 17:24         ` Chas Williams
2019-03-24 18:01         ` David Marchand
2019-03-24 18:01           ` David Marchand
2019-09-30 13:49     ` Yigit, Ferruh
2019-03-22 11:18 ` [dpdk-dev] [PATCH 1/2] net/bonding: fix more incorrect slave id types Maxime Coquelin
2019-03-22 11:18   ` Maxime Coquelin
2019-09-30 13:49   ` Yigit, Ferruh
2019-03-24 13:28 ` Chas Williams
2019-03-24 13:28   ` Chas Williams
2019-03-24 17:13   ` David Marchand
2019-03-24 17:13     ` David Marchand

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=8eb07dc9-0640-66bd-22aa-e8518d449e97@gmail.com \
    --to=3chas3@gmail.com \
    --cc=chas3@att.com \
    --cc=david.marchand@redhat.com \
    --cc=dev@dpdk.org \
    --cc=ferruh.yigit@intel.com \
    --cc=stable@dpdk.org \
    --cc=zhaohui8@huawei.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).