netdev - Re: [PATCH v3 net-next 0/2] enetc: unlock XDP

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Date:   Mon, 12 Dec 2022 21:51:30 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     netdev@...r.kernel.org, claudiu.manoil@....com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, lorenzo.bianconi@...hat.com
Subject: Re: [PATCH v3 net-next 0/2] enetc: unlock XDP_REDIRECT for XDP
 non-linear

On Sat, Dec 10, 2022 at 02:53:09PM +0100, Lorenzo Bianconi wrote:
> Unlock XDP_REDIRECT for S/G XDP buffer and rely on XDP stack to properly
> take care of the frames.
> Remove xdp_redirect_sg counter and the related ethtool entry since it is
> no longer used.
> 
> Changes since v2:
> - remove xdp_redirect_sg ethtool counter
> Changes since v1:
> - drop Fixes tag
> - unlock XDP_REDIRECT
> - populate missing XDP metadata
> 
> Please note this patch is just compile tested
> 
> Lorenzo Bianconi (2):
>   net: ethernet: enetc: unlock XDP_REDIRECT for XDP non-linear buffers
>   net: ethernet: enetc: get rid of xdp_redirect_sg counter
> 
>  drivers/net/ethernet/freescale/enetc/enetc.c  | 25 ++++++++-----------
>  drivers/net/ethernet/freescale/enetc/enetc.h  |  1 -
>  .../ethernet/freescale/enetc/enetc_ethtool.c  |  2 --
>  3 files changed, 10 insertions(+), 18 deletions(-)

NACK.

xdp_redirect_cpu works, but OOM is still there if we XDP_REDIRECT to
another interface. That needs to be solved first.

root@...ian:~# ./bpf/xdp_redirect eno0 eno2
[  313.613983] fsl_enetc 0000:00:00.0 eno0: Link is Down
[  313.699861] fsl_enetc 0000:00:00.0 eno0: PHY [0000:00:00.3:02] driver [Qualcomm Atheros AR8031/AR8033] (irq=POLL)
[  313.735530] fsl_enetc 0000:00:00.0 eno0: configuring for inband/sgmii link mode
[  313.754024] fsl_enetc 0000:00:00.2 eno2: Link is Down
[  313.798565] fsl_enetc 0000:00:00.2 eno2: configuring for fixed/internal link mode
[  313.806252] fsl_enetc 0000:00:00.2 eno2: Link is Up - 2.5Gbps/Full - flow control rx/tx
Redirecting from eno0 (ifindex 6; driver fsl_enetc) to eno2 (ifindex 7; driver fsl_enetc)
[  315.791491] fsl_enetc 0000:00:00.0 eno0: Link is Up - 1Gbps/Full - flow control rx/tx
[  315.799451] IPv6: ADDRCONF(NETDEV_CHANGE): eno0: link becomes ready
eno0->eno2                      0 rx/s                  0 err,drop/s            0 xmit/s
eno0->eno2                      0 rx/s                  0 err,drop/s            0 xmit/s
eno0->eno2                  19806 rx/s                  0 err,drop/s            0 xmit/s
eno0->eno2                  81274 rx/s                  0 err,drop/s            0 xmit/s
eno0->eno2                  81275 rx/s                  0 err,drop/s            0 xmit/s
eno0->eno2                  81274 rx/s                  0 err,drop/s            0 xmit/s
eno0->eno2                  81274 rx/s                  0 err,drop/s            0 xmit/s
eno0->eno2                  75733 rx/s                  0 err,drop/s            0 xmit/s
eno0->eno2                   1562 rx/s                  0 err,drop/s            0 xmit/s
eno0->eno2                      0 rx/s                  0 err,drop/s            0 xmit/s
eno0->eno2                      0 rx/s                  0 err,drop/s            0 xmit/s
eno0->eno2                      0 rx/s                  0 err,drop/s            0 xmit/s
eno0->eno2                      0 rx/s                  0 err,drop/s            0 xmit/s
eno0->eno2                      0 rx/s                  0 err,drop/s            0 xmit/s
eno0->eno2                      0 rx/s                  0 err,drop/s            0 xmit/s
eno0->eno2                      0 rx/s                  0 err,drop/s            0 xmit/s
^Z
[1]+  Stopped                 ./nxp_board_rootfs/bpf/xdp_redirect eno0 eno2
[  347.901643] bash invoked oom-killer: gfp_mask=0x40cc0(GFP_KERNEL|__GFP_COMP), order=0, oom_score_adj=0
[  347.911254] CPU: 1 PID: 412 Comm: bash Not tainted 6.1.0-rc8-07010-ga9b9500ffaac-dirty #754
[  347.919676] Hardware name: LS1028A RDB Board (DT)
[  347.924423] Call trace:
[  347.926901]  dump_backtrace.part.0+0xe8/0xf4
[  347.931223]  show_stack+0x20/0x50
[  347.934579]  dump_stack_lvl+0x8c/0xb8
[  347.938288]  dump_stack+0x18/0x34
[  347.941644]  dump_header+0x50/0x2ec
[  347.945182]  oom_kill_process+0x384/0x390
[  347.949243]  out_of_memory+0x218/0x670
[  347.953039]  __alloc_pages+0xf28/0x1080
[  347.956919]  cache_grow_begin+0x98/0x390
[  347.960887]  fallback_alloc+0x1f8/0x2bc
[  347.964765]  ____cache_alloc_node+0x17c/0x194
[  347.969168]  kmem_cache_alloc+0x214/0x2d0
[  347.973222]  getname_flags.part.0+0x3c/0x1a4
[  347.977536]  getname_flags+0x4c/0x7c
[  347.981151]  vfs_fstatat+0x4c/0x90
[  347.984595]  __do_sys_newfstatat+0x2c/0x70
[  347.988737]  __arm64_sys_newfstatat+0x28/0x34
[  347.993140]  invoke_syscall+0x50/0x120
[  347.996939]  el0_svc_common.constprop.0+0x68/0x124