| Message ID | 20230524125714.357337-1-wei.fang@nxp.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [net] net: stmmac: fix call trace when stmmac_xdp_xmit() is invoked | expand |
On Wed, May 24, 2023 at 08:57:14PM +0800, wei.fang@nxp.com wrote: > From: Wei Fang <wei.fang@nxp.com> > > We encountered a kernel call trace issue which was related to > ndo_xdp_xmit callback on our i.MX8MP platform. The reproduce > steps show as follows. > 1. The FEC port (eth0) connects to a PC port, and the PC uses > pktgen_sample03_burst_single_flow.sh to generate packets and > send these packets to the FEC port. Notice that the script must > be executed before step 2. > 2. Run the "./xdp_redirect eth0 eth1" command on i.MX8MP, the > eth1 interface is the dwmac. Then there will be a call trace > issue soon. Please see the log for more details. > The root cause is that the NETDEV_XDP_ACT_NDO_XMIT feature is > enabled by default, so when the step 2 command is exexcuted > and packets have already been sent to eth0, the stmmac_xdp_xmit() > starts running before the stmmac_xdp_set_prog() finishes. To > resolve this issue, we disable the NETDEV_XDP_ACT_NDO_XMIT > feature by default and turn on/off this feature when the bpf > program is installed/uninstalled which just like the other > ethernet drivers. > > Call Trace log: > [ 306.311271] ------------[ cut here ]------------ > [ 306.315910] WARNING: CPU: 0 PID: 15 at lib/timerqueue.c:55 timerqueue_del+0x68/0x70 > [ 306.323590] Modules linked in: > [ 306.326654] CPU: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 6.4.0-rc1+ #37 > [ 306.333277] Hardware name: NXP i.MX8MPlus EVK board (DT) > [ 306.338591] pstate: 600000c5 (nZCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--) > [ 306.345561] pc : timerqueue_del+0x68/0x70 > [ 306.349577] lr : __remove_hrtimer+0x5c/0xa0 > [ 306.353777] sp : ffff80000b7c3920 > [ 306.357094] x29: ffff80000b7c3920 x28: 0000000000000000 x27: 0000000000000001 > [ 306.364244] x26: ffff80000a763a40 x25: ffff0000d0285a00 x24: 0000000000000001 > [ 306.371390] x23: 0000000000000001 x22: ffff000179389a40 x21: 0000000000000000 > [ 306.378537] x20: ffff000179389aa0 x19: ffff0000d2951308 x18: 0000000000001000 > [ 306.385686] x17: f1d3000000000000 x16: 00000000c39c1000 x15: 55e99bbe00001a00 > [ 306.392835] x14: 09000900120aa8c0 x13: e49af1d300000000 x12: 000000000000c39c > [ 306.399987] x11: 100055e99bbe0000 x10: ffff8000090b1048 x9 : ffff8000081603fc > [ 306.407133] x8 : 000000000000003c x7 : 000000000000003c x6 : 0000000000000001 > [ 306.414284] x5 : ffff0000d2950980 x4 : 0000000000000000 x3 : 0000000000000000 > [ 306.421432] x2 : 0000000000000001 x1 : ffff0000d2951308 x0 : ffff0000d2951308 > [ 306.428585] Call trace: > [ 306.431035] timerqueue_del+0x68/0x70 > [ 306.434706] __remove_hrtimer+0x5c/0xa0 > [ 306.438549] hrtimer_start_range_ns+0x2bc/0x370 > [ 306.443089] stmmac_xdp_xmit+0x174/0x1b0 > [ 306.447021] bq_xmit_all+0x194/0x4b0 > [ 306.450612] __dev_flush+0x4c/0x98 > [ 306.454024] xdp_do_flush+0x18/0x38 > [ 306.457522] fec_enet_rx_napi+0x6c8/0xc68 > [ 306.461539] __napi_poll+0x40/0x220 > [ 306.465038] net_rx_action+0xf8/0x240 > [ 306.468707] __do_softirq+0x128/0x3a8 > [ 306.472378] run_ksoftirqd+0x40/0x58 > [ 306.475961] smpboot_thread_fn+0x1c4/0x288 > [ 306.480068] kthread+0x124/0x138 > [ 306.483305] ret_from_fork+0x10/0x20 > [ 306.486889] ---[ end trace 0000000000000000 ]--- > > Fixes: 66c0e13ad236 ("drivers: net: turn on XDP features") > Signed-off-by: Wei Fang <wei.fang@nxp.com> This looks good to me. Reviewed-by: Simon Horman <simon.horman@corigine.com> Alexandre, is there any feedback from your side?
Hello: This patch was applied to netdev/net.git (main) by Jakub Kicinski <kuba@kernel.org>: On Wed, 24 May 2023 20:57:14 +0800 you wrote: > From: Wei Fang <wei.fang@nxp.com> > > We encountered a kernel call trace issue which was related to > ndo_xdp_xmit callback on our i.MX8MP platform. The reproduce > steps show as follows. > 1. The FEC port (eth0) connects to a PC port, and the PC uses > pktgen_sample03_burst_single_flow.sh to generate packets and > send these packets to the FEC port. Notice that the script must > be executed before step 2. > 2. Run the "./xdp_redirect eth0 eth1" command on i.MX8MP, the > eth1 interface is the dwmac. Then there will be a call trace > issue soon. Please see the log for more details. > The root cause is that the NETDEV_XDP_ACT_NDO_XMIT feature is > enabled by default, so when the step 2 command is exexcuted > and packets have already been sent to eth0, the stmmac_xdp_xmit() > starts running before the stmmac_xdp_set_prog() finishes. To > resolve this issue, we disable the NETDEV_XDP_ACT_NDO_XMIT > feature by default and turn on/off this feature when the bpf > program is installed/uninstalled which just like the other > ethernet drivers. > > [...] Here is the summary with links: - [net] net: stmmac: fix call trace when stmmac_xdp_xmit() is invoked https://git.kernel.org/netdev/net/c/ffb3322181d9 You are awesome, thank you!
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index 0fca81507a77..52cab9de05f2 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -7233,8 +7233,7 @@ int stmmac_dvr_probe(struct device *device, ndev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | NETIF_F_RXCSUM; ndev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT | - NETDEV_XDP_ACT_XSK_ZEROCOPY | - NETDEV_XDP_ACT_NDO_XMIT; + NETDEV_XDP_ACT_XSK_ZEROCOPY; ret = stmmac_tc_init(priv, priv); if (!ret) { diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_xdp.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_xdp.c index 9d4d8c3dad0a..aa6f16d3df64 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_xdp.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_xdp.c @@ -117,6 +117,9 @@ int stmmac_xdp_set_prog(struct stmmac_priv *priv, struct bpf_prog *prog, return -EOPNOTSUPP; } + if (!prog) + xdp_features_clear_redirect_target(dev); + need_update = !!priv->xdp_prog != !!prog; if (if_running && need_update) stmmac_xdp_release(dev); @@ -131,5 +134,8 @@ int stmmac_xdp_set_prog(struct stmmac_priv *priv, struct bpf_prog *prog, if (if_running && need_update) stmmac_xdp_open(dev); + if (prog) + xdp_features_set_redirect_target(dev, false); + return 0; }