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Message-ID: <PH0PR11MB583035D379A98C44510A7D8ED8042@PH0PR11MB5830.namprd11.prod.outlook.com>
Date: Tue, 17 Dec 2024 01:28:44 +0000
From: "Song, Yoong Siang" <yoong.siang.song@...el.com>
To: Paul Menzel <pmenzel@...gen.mpg.de>
CC: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann
<daniel@...earbox.net>, "David S . Miller" <davem@...emloft.net>, "Jakub
Kicinski" <kuba@...nel.org>, Jesper Dangaard Brouer <hawk@...nel.org>, "John
Fastabend" <john.fastabend@...il.com>, "Nguyen, Anthony L"
<anthony.l.nguyen@...el.com>, "Kitszel, Przemyslaw"
<przemyslaw.kitszel@...el.com>, Andrew Lunn <andrew+netdev@...n.ch>, "Eric
Dumazet" <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
"Fijalkowski, Maciej" <maciej.fijalkowski@...el.com>, "Gomes, Vinicius"
<vinicius.gomes@...el.com>, "intel-wired-lan@...ts.osuosl.org"
<intel-wired-lan@...ts.osuosl.org>, "netdev@...r.kernel.org"
<netdev@...r.kernel.org>, "linux-kernel@...r.kernel.org"
<linux-kernel@...r.kernel.org>, "bpf@...r.kernel.org" <bpf@...r.kernel.org>
Subject: RE: [Intel-wired-lan] [PATCH iwl-next v2 1/1] igc: Improve
XDP_SETUP_PROG process
On Friday, December 13, 2024 4:10 PM, Paul Menzel <pmenzel@...gen.mpg.de> wrote:
>Dear Song,
>
>
>Thank you for your patch. Maybe for the summary/title you could be more
>specific:
>
>igc: Avoid unnecessary link down event in XDP_SETUP_PROG process
>
>
>Am 11.12.24 um 14:45 schrieb Song Yoong Siang:
>> Improve XDP_SETUP_PROG process by avoiding unnecessary link down event.
>>
>> This patch is tested by using ip link set xdpdrv command to attach a simple
>> XDP program which always return XDP_PASS.
>
>return*s*
>
>> Before this patch, attaching xdp program will cause ptp4l to lost sync for
>
>to lose
>
>> few seconds, as shown in ptp4l log below:
>> ptp4l[198.082]: rms 4 max 8 freq +906 +/- 2 delay 12 +/- 0
>> ptp4l[199.082]: rms 3 max 4 freq +906 +/- 3 delay 12 +/- 0
>> ptp4l[199.536]: port 1 (enp2s0): link down
>> ptp4l[199.536]: port 1 (enp2s0): SLAVE to FAULTY on FAULT_DETECTED
>(FT_UNSPECIFIED)
>> ptp4l[199.600]: selected local clock 22abbc.fffe.bb1234 as best master
>> ptp4l[199.600]: port 1 (enp2s0): assuming the grand master role
>> ptp4l[199.600]: port 1 (enp2s0): master state recommended in slave only mode
>> ptp4l[199.600]: port 1 (enp2s0): defaultDS.priority1 probably misconfigured
>> ptp4l[202.266]: port 1 (enp2s0): link up
>> ptp4l[202.300]: port 1 (enp2s0): FAULTY to LISTENING on INIT_COMPLETE
>> ptp4l[205.558]: port 1 (enp2s0): new foreign master 44abbc.fffe.bb2144-1
>> ptp4l[207.558]: selected best master clock 44abbc.fffe.bb2144
>> ptp4l[207.559]: port 1 (enp2s0): LISTENING to UNCALIBRATED on RS_SLAVE
>> ptp4l[208.308]: port 1 (enp2s0): UNCALIBRATED to SLAVE on
>MASTER_CLOCK_SELECTED
>> ptp4l[208.933]: rms 742 max 1303 freq -195 +/- 682 delay 12 +/- 0
>> ptp4l[209.933]: rms 178 max 274 freq +387 +/- 243 delay 12 +/- 0
>>
>> After this patch, attaching xdp program no longer cause ptp4l to lost sync,
>
>to lose
>
>> as shown on ptp4l log below:
>> ptp4l[201.183]: rms 1 max 3 freq +959 +/- 1 delay 8 +/- 0
>> ptp4l[202.183]: rms 1 max 3 freq +961 +/- 2 delay 8 +/- 0
>> ptp4l[203.183]: rms 2 max 3 freq +958 +/- 2 delay 8 +/- 0
>> ptp4l[204.183]: rms 3 max 5 freq +961 +/- 3 delay 8 +/- 0
>> ptp4l[205.183]: rms 2 max 4 freq +964 +/- 3 delay 8 +/- 0
>>
>> Besides, before this patch, attaching xdp program will cause flood ping to
>> loss 10 packets, as shown in ping statistics below:
>
>to lose
>
>> --- 169.254.1.2 ping statistics ---
>> 100000 packets transmitted, 99990 received, +6 errors, 0.01% packet loss, time
>34001ms
>> rtt min/avg/max/mdev = 0.028/0.301/3104.360/13.838 ms, pipe 10, ipg/ewma
>0.340/0.243 ms
>>
>> After this patch, attaching xdp program no longer cause flood ping to loss
>
>cause*s*, to lose
>
>> any packets, as shown in ping statistics below:
>> --- 169.254.1.2 ping statistics ---
>> 100000 packets transmitted, 100000 received, 0% packet loss, time 32326ms
>> rtt min/avg/max/mdev = 0.027/0.231/19.589/0.155 ms, pipe 2, ipg/ewma
>0.323/0.322 ms
>>
>> On the other hand, this patch is also tested with tools/testing/selftests/
>> bpf/xdp_hw_metadata app to make sure XDP zero-copy is working fine with
>> XDP Tx and Rx metadata. Below is the result of last packet after received
>> 10000 UDP packets with interval 1 ms:
>> poll: 1 (0) skip=0 fail=0 redir=10000
>> xsk_ring_cons__peek: 1
>> 0x55881c7ef7a8: rx_desc[9999]->addr=8f110 addr=8f110 comp_addr=8f110 EoP
>> rx_hash: 0xFB9BB6A3 with RSS type:0x1
>> HW RX-time: 1733923136269470866 (sec:1733923136.2695) delta to User RX-
>time sec:0.0000 (43.280 usec)
>> XDP RX-time: 1733923136269482482 (sec:1733923136.2695) delta to User RX-
>time sec:0.0000 (31.664 usec)
>> No rx_vlan_tci or rx_vlan_proto, err=-95
>> 0x55881c7ef7a8: ping-pong with csum=ab19 (want 315b) csum_start=34
>csum_offset=6
>> 0x55881c7ef7a8: complete tx idx=9999 addr=f010
>> HW TX-complete-time: 1733923136269591637 (sec:1733923136.2696) delta to
>User TX-complete-time sec:0.0001 (108.571 usec)
>> XDP RX-time: 1733923136269482482 (sec:1733923136.2695) delta to User TX-
>complete-time sec:0.0002 (217.726 usec)
>> HW RX-time: 1733923136269470866 (sec:1733923136.2695) delta to HW TX-
>complete-time sec:0.0001 (120.771 usec)
>> 0x55881c7ef7a8: complete rx idx=10127 addr=8f110
>>
>> Signed-off-by: Song Yoong Siang <yoong.siang.song@...el.com>
>> ---
>> V2 changelog:
>> - show some examples of problem in commit msg. (Vinicius)
>> - igc_close()/igc_open() are too big a hammer for installing a new XDP
>> program. Only do we we really need. (Vinicius)
>
>The first sentence of the second item could go into the commit message
>with a note, why `igc_close()`/`igc_open()` are not needed.
>
>> ---
>> drivers/net/ethernet/intel/igc/igc_xdp.c | 19 +++++++++++++++----
>> 1 file changed, 15 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/intel/igc/igc_xdp.c
>b/drivers/net/ethernet/intel/igc/igc_xdp.c
>> index 869815f48ac1..64b04aad614c 100644
>> --- a/drivers/net/ethernet/intel/igc/igc_xdp.c
>> +++ b/drivers/net/ethernet/intel/igc/igc_xdp.c
>> @@ -14,6 +14,7 @@ int igc_xdp_set_prog(struct igc_adapter *adapter, struct
>bpf_prog *prog,
>> bool if_running = netif_running(dev);
>> struct bpf_prog *old_prog;
>> bool need_update;
>> + int i;
>
>I’d use unsigned int as it’s used to access array elements.
>
>>
>> if (dev->mtu > ETH_DATA_LEN) {
>> /* For now, the driver doesn't support XDP functionality with
>> @@ -24,8 +25,13 @@ int igc_xdp_set_prog(struct igc_adapter *adapter, struct
>bpf_prog *prog,
>> }
>>
>> need_update = !!adapter->xdp_prog != !!prog;
>> - if (if_running && need_update)
>> - igc_close(dev);
>> + if (if_running && need_update) {
>> + for (i = 0; i < adapter->num_rx_queues; i++) {
>> + igc_disable_rx_ring(adapter->rx_ring[i]);
>> + igc_disable_tx_ring(adapter->tx_ring[i]);
>> + napi_disable(&adapter->rx_ring[i]->q_vector->napi);
>> + }
>> + }
>>
>> old_prog = xchg(&adapter->xdp_prog, prog);
>> if (old_prog)
>> @@ -36,8 +42,13 @@ int igc_xdp_set_prog(struct igc_adapter *adapter, struct
>bpf_prog *prog,
>> else
>> xdp_features_clear_redirect_target(dev);
>>
>> - if (if_running && need_update)
>> - igc_open(dev);
>> + if (if_running && need_update) {
>> + for (i = 0; i < adapter->num_rx_queues; i++) {
>> + napi_enable(&adapter->rx_ring[i]->q_vector->napi);
>> + igc_enable_tx_ring(adapter->tx_ring[i]);
>> + igc_enable_rx_ring(adapter->rx_ring[i]);
>> + }
>> + }
>>
>> return 0;
>> }
>
>
>Kind regards,
>
>Paul
Hi Paul,
Thank you for your valuable review comments.
FYI, I submitted v3 [1] to address your comments.
Please feel free to review again.
[1] https://patchwork.ozlabs.org/project/intel-wired-lan/patch/20241216073849.3555825-1-yoong.siang.song@intel.com/
Thanks & Regards
Siang
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