netdev - Re: [PATCH net-next v5 0/5] Introduce NETIF_F_GRO

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Date:   Sun, 13 Jan 2019 12:36:07 +0200
From:   Shay Agroskin <agrosshay@...il.com>
To:     Michael Chan <michael.chan@...adcom.com>,
        Shay Agroskin <shayag@...lanox.com>
Cc:     "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "andrew.gospodarek@...adcom.com" <andrew.gospodarek@...adcom.com>,
        Tariq Toukan <tariqt@...lanox.com>,
        Eran Ben Elisha <eranbe@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: Re: [PATCH net-next v5 0/5] Introduce NETIF_F_GRO_HW

Thank you for your replies. It answered my questions.

Shay

On 1/8/2019 12:58 PM, Michael Chan wrote:
> On Mon, Jan 7, 2019 at 6:00 AM Shay Agroskin <shayag@...lanox.com> wrote:
>
>> a) All segments (aggregated packets) must be of the same size (except possibly the last one).
>> (This in order to know each segments size, when re-segmenting an aggregated packet)
>>
>> b) IP ID must be incrementing unless DF is
>> (To have  the whole 4th layer, in order to know if a packet belongs to a certain flow)
>>
>> c) Also, all the other fields need to be the same to belong to the same flow and be aggregated.
>>
>> Any thoughts? Do I miss anything here ?
> In addition, the GRO SKB needs to be setup properly.  For example, the
> gso_type, gso_size, gso_segs, CHECKSUM_PARTIAL, etc, all have to be
> setup.  Hardware needs to provide all the necessary information to set
> this up.  In case this GRO SKB is re-routed to an output device, TSO
> or GSO needs to be performed on the packet and the original packet
> stream should be re-constituted exactly.