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Date: Wed, 12 Apr 2023 15:37:01 +0000
From: "Song, Yoong Siang" <yoong.siang.song@...el.com>
To: "Brouer, Jesper" <brouer@...hat.com>,
"bpf@...r.kernel.org" <bpf@...r.kernel.org>
CC: "Brouer, Jesper" <brouer@...hat.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
Stanislav Fomichev <sdf@...gle.com>,
"martin.lau@...nel.org" <martin.lau@...nel.org>,
"ast@...nel.org" <ast@...nel.org>,
"daniel@...earbox.net" <daniel@...earbox.net>,
"Lobakin, Aleksander" <aleksander.lobakin@...el.com>,
"Zaremba, Larysa" <larysa.zaremba@...el.com>,
"xdp-hints@...-project.net" <xdp-hints@...-project.net>,
"Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
"Ong, Boon Leong" <boon.leong.ong@...el.com>,
"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
"pabeni@...hat.com" <pabeni@...hat.com>,
"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
"kuba@...nel.org" <kuba@...nel.org>,
"edumazet@...gle.com" <edumazet@...gle.com>,
"john.fastabend@...il.com" <john.fastabend@...il.com>,
"hawk@...nel.org" <hawk@...nel.org>,
"davem@...emloft.net" <davem@...emloft.net>
Subject: RE: [PATCH bpf-next V3 5/6] igc: add XDP hints kfuncs for RX
timestamp
On Wednesday, April 12, 2023 7:41 PM, Song Yoong Siang wrote:
>On Thursday, March 23, 2023 12:02 AM , Jesper Dangaard Brouer
><brouer@...hat.com> wrote:
>>The NIC hardware RX timestamping mechanism adds an optional tailored
>>header before the MAC header containing packet reception time. Optional
>>depending on RX descriptor TSIP status bit (IGC_RXDADV_STAT_TSIP). In
>>case this bit is set driver does offset adjustments to packet data start and
>extracts the timestamp.
>>
>>The timestamp need to be extracted before invoking the XDP bpf_prog,
>>because this area just before the packet is also accessible by XDP via
>>data_meta context pointer (and helper bpf_xdp_adjust_meta). Thus, an
>>XDP bpf_prog can potentially overwrite this and corrupt data that we
>>want to extract with the new kfunc for reading the timestamp.
>>
>>Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
Tested-by: Song Yoong Siang <yoong.siang.song@...el.com>
Tested Rx HWTS metadata on I226-LM (rev 04) NIC.
Below are the detail of test steps and result.
1. Run xdp_hw_metadata tool.
@DUT: sudo ./xdp_hw_metadata eth0
2. Enable Rx HWTS for all incoming packets. Note: This step should not needed, so
it should be a HWTS enablement bug on igc driver. I will take a look on it.
@DUT: sudo hwstamp_ctl -i eth0 -r 1
3. Set the ptp clock time from the system time using testptp tool.
@DUT: sudo ./testptp -d /dev/ptp0 -s
4. Send UDP packet with 9091 port from link partner immediately after step 3.
@LinkPartner: echo -n xdp | nc -u -q1 <Destination IPv4 addr> 9091
Result:
xsk_ring_cons__peek: 1
0x559288636880: rx_desc[2]->addr=100000000202000 addr=202100 comp_addr=202000
rx_hash: 0x0E550050
rx_timestamp: 1677762906850259640 (sec:1677762906.8503)
XDP RX-time: 1677762906850374981 (sec:1677762906.8504) delta sec:0.0001 (115.341 usec)
AF_XDP time: 1677762906850396571 (sec:1677762906.8504) delta sec:0.0000 (21.590 usec)
0x559288636880: complete idx=514 addr=202000
>>---
>> drivers/net/ethernet/intel/igc/igc.h | 1 +
>> drivers/net/ethernet/intel/igc/igc_main.c | 20 ++++++++++++++++++++
>> 2 files changed, 21 insertions(+)
>>
>>diff --git a/drivers/net/ethernet/intel/igc/igc.h
>>b/drivers/net/ethernet/intel/igc/igc.h
>>index bc67a52e47e8..29941734f1a1 100644
>>--- a/drivers/net/ethernet/intel/igc/igc.h
>>+++ b/drivers/net/ethernet/intel/igc/igc.h
>>@@ -503,6 +503,7 @@ struct igc_rx_buffer { struct igc_xdp_buff {
>> struct xdp_buff xdp;
>> union igc_adv_rx_desc *rx_desc;
>>+ ktime_t rx_ts; /* data indication bit IGC_RXDADV_STAT_TSIP */
>> };
>>
>> struct igc_q_vector {
>>diff --git a/drivers/net/ethernet/intel/igc/igc_main.c
>>b/drivers/net/ethernet/intel/igc/igc_main.c
>>index a78d7e6bcfd6..f66285c85444 100644
>>--- a/drivers/net/ethernet/intel/igc/igc_main.c
>>+++ b/drivers/net/ethernet/intel/igc/igc_main.c
>>@@ -2539,6 +2539,7 @@ static int igc_clean_rx_irq(struct igc_q_vector
>>*q_vector, const int budget)
>> if (igc_test_staterr(rx_desc, IGC_RXDADV_STAT_TSIP)) {
>> timestamp = igc_ptp_rx_pktstamp(q_vector->adapter,
>> pktbuf);
>>+ ctx.rx_ts = timestamp;
>> pkt_offset = IGC_TS_HDR_LEN;
>> size -= IGC_TS_HDR_LEN;
>> }
>>@@ -2727,6 +2728,7 @@ static int igc_clean_rx_irq_zc(struct
>>igc_q_vector *q_vector, const int budget)
>> if (igc_test_staterr(desc, IGC_RXDADV_STAT_TSIP)) {
>> timestamp = igc_ptp_rx_pktstamp(q_vector->adapter,
>> bi->xdp->data);
>>+ ctx->rx_ts = timestamp;
>>
>> bi->xdp->data += IGC_TS_HDR_LEN;
>>
>>@@ -6481,6 +6483,23 @@ u32 igc_rd32(struct igc_hw *hw, u32 reg)
>> return value;
>> }
>>
>>+static int igc_xdp_rx_timestamp(const struct xdp_md *_ctx, u64
>>+*timestamp) {
>>+ const struct igc_xdp_buff *ctx = (void *)_ctx;
>>+
>>+ if (igc_test_staterr(ctx->rx_desc, IGC_RXDADV_STAT_TSIP)) {
>>+ *timestamp = ctx->rx_ts;
>>+
>>+ return 0;
>>+ }
>>+
>>+ return -ENODATA;
>>+}
>>+
>>+const struct xdp_metadata_ops igc_xdp_metadata_ops = {
>
>Hi Jesper,
>
>Since igc_xdp_metadata_ops is used on igc_main.c only, we can make it static to
>avoid following build warning:
>
>drivers/net/ethernet/intel/igc/igc_main.c:6499:31: warning: symbol
>'igc_xdp_metadata_ops' was not declared. Should it be static?
>
>Thanks & Regards
>Siang
>
>>+ .xmo_rx_timestamp = igc_xdp_rx_timestamp,
>>+};
>>+
>> /**
>> * igc_probe - Device Initialization Routine
>> * @pdev: PCI device information struct @@ -6554,6 +6573,7 @@ static
>>int igc_probe(struct pci_dev *pdev,
>> hw->hw_addr = adapter->io_addr;
>>
>> netdev->netdev_ops = &igc_netdev_ops;
>>+ netdev->xdp_metadata_ops = &igc_xdp_metadata_ops;
>> igc_ethtool_set_ops(netdev);
>> netdev->watchdog_timeo = 5 * HZ;
>>
>>
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