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Subject: Re: [PATCH net] iwlwifi: provide gso_type to GSO packets
To:     Eric Dumazet <eric.dumazet@gmail.com>,
        "David S . Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>
Cc:     netdev <netdev@vger.kernel.org>,
        Eric Dumazet <edumazet@google.com>,
        Luca Coelho <luciano.coelho@intel.com>,
        linux-wireless@vger.kernel.org,
        Johannes Berg <johannes@sipsolutions.net>
References: <20210125150949.619309-1-eric.dumazet@gmail.com>
From:   Ben Greear <greearb@candelatech.com>
Organization: Candela Technologies
Message-ID: <97cf98b0-d464-1901-f01f-ac5dd362561d@candelatech.com>
Date:   Mon, 25 Jan 2021 07:15:04 -0800
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On 1/25/21 7:09 AM, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@google.com>
> 
> net/core/tso.c got recent support for USO, and this broke iwlfifi
> because the driver implemented a limited form of GSO.
> 
> Providing ->gso_type allows for skb_is_gso_tcp() to provide
> a correct result.
> 
> Fixes: 3d5b459ba0e3 ("net: tso: add UDP segmentation support")
> Signed-off-by: Eric Dumazet <edumazet@google.com>
> Reported-by: Ben Greear <greearb@candelatech.com>
> Bisected-by: Ben Greear <greearb@candelatech.com>

I appreciate the credit, but the bisect and some other initial bug hunting was
done by people on this thread:

https://bugzilla.kernel.org/show_bug.cgi?id=209913

Thanks,
Ben

> Tested-by: Ben Greear <greearb@candelatech.com>
> Cc: Luca Coelho <luciano.coelho@intel.com>
> Cc: linux-wireless@vger.kernel.org
> Cc: Johannes Berg <johannes@sipsolutions.net>
> ---
>   drivers/net/wireless/intel/iwlwifi/mvm/tx.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/tx.c b/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
> index a983c215df310776ffe67f3b3ffa203eab609bfc..3712adc3ccc2511d46bcc855efbfba41c487d8e6 100644
> --- a/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
> +++ b/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
> @@ -773,6 +773,7 @@ iwl_mvm_tx_tso_segment(struct sk_buff *skb, unsigned int num_subframes,
>   
>   	next = skb_gso_segment(skb, netdev_flags);
>   	skb_shinfo(skb)->gso_size = mss;
> +	skb_shinfo(skb)->gso_type = ipv4 ? SKB_GSO_TCPV4 : SKB_GSO_TCPV6;
>   	if (WARN_ON_ONCE(IS_ERR(next)))
>   		return -EINVAL;
>   	else if (next)
> @@ -795,6 +796,8 @@ iwl_mvm_tx_tso_segment(struct sk_buff *skb, unsigned int num_subframes,
>   
>   		if (tcp_payload_len > mss) {
>   			skb_shinfo(tmp)->gso_size = mss;
> +			skb_shinfo(tmp)->gso_type = ipv4 ? SKB_GSO_TCPV4 :
> +							   SKB_GSO_TCPV6;
>   		} else {
>   			if (qos) {
>   				u8 *qc;
> 


-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com