netdev - Re: [PATCH net v3] net: Clear old fragment checksum value in napi_reuse

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Message-Id: 
 <174062523299.949564.12243959200939454238.git-patchwork-notify@kernel.org>
Date: Thu, 27 Feb 2025 03:00:32 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Mohammad Heib <mheib@...hat.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
 kuba@...nel.org, pabeni@...hat.com
Subject: Re: [PATCH net v3] net: Clear old fragment checksum value in
 napi_reuse_skb

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@...nel.org>:

On Tue, 25 Feb 2025 13:28:52 +0200 you wrote:
> In certain cases, napi_get_frags() returns an skb that points to an old
> received fragment, This skb may have its skb->ip_summed, csum, and other
> fields set from previous fragment handling.
> 
> Some network drivers set skb->ip_summed to either CHECKSUM_COMPLETE or
> CHECKSUM_UNNECESSARY when getting skb from napi_get_frags(), while
> others only set skb->ip_summed when RX checksum offload is enabled on
> the device, and do not set any value for skb->ip_summed when hardware
> checksum offload is disabled, assuming that the skb->ip_summed
> initiated to zero by napi_reuse_skb, ionic driver for example will
> ignore/unset any value for the ip_summed filed if HW checksum offload is
> disabled, and if we have a situation where the user disables the
> checksum offload during a traffic that could lead to the following
> errors shown in the kernel logs:
> <IRQ>
> dump_stack_lvl+0x34/0x48
>  __skb_gro_checksum_complete+0x7e/0x90
> tcp6_gro_receive+0xc6/0x190
> ipv6_gro_receive+0x1ec/0x430
> dev_gro_receive+0x188/0x360
> ? ionic_rx_clean+0x25a/0x460 [ionic]
> napi_gro_frags+0x13c/0x300
> ? __pfx_ionic_rx_service+0x10/0x10 [ionic]
> ionic_rx_service+0x67/0x80 [ionic]
> ionic_cq_service+0x58/0x90 [ionic]
> ionic_txrx_napi+0x64/0x1b0 [ionic]
>  __napi_poll+0x27/0x170
> net_rx_action+0x29c/0x370
> handle_softirqs+0xce/0x270
> __irq_exit_rcu+0xa3/0xc0
> common_interrupt+0x80/0xa0
> </IRQ>
> 
> [...]

Here is the summary with links:
  - [net,v3] net: Clear old fragment checksum value in napi_reuse_skb
    https://git.kernel.org/netdev/net/c/49806fe6e61b

You are awesome, thank you!
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