netdev - Re: [PATCH net-next RFC v1 02/10] net: Introduce direct data placement tcp offload

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Date:   Sun, 11 Oct 2020 17:44:07 +0300
From:   Boris Pismenny <borispismenny@...il.com>
To:     Sagi Grimberg <sagi@...mberg.me>,
        Boris Pismenny <borisp@...lanox.com>, kuba@...nel.org,
        davem@...emloft.net, saeedm@...dia.com, hch@....de, axboe@...com,
        kbusch@...nel.org, viro@...iv.linux.org.uk, edumazet@...gle.com
Cc:     Yoray Zack <yorayz@...lanox.com>,
        Ben Ben-Ishay <benishay@...lanox.com>,
        boris.pismenny@...il.com, linux-nvme@...ts.infradead.org,
        netdev@...r.kernel.org, Or Gerlitz <ogerlitz@...lanox.com>,
        Boris Pismenny <borisp@...dia.com>
Subject: Re: [PATCH net-next RFC v1 02/10] net: Introduce direct data
 placement tcp offload



On 09/10/2020 0:47, Sagi Grimberg wrote:
>> + * tcp_ddp.h
>> + *	Author:	Boris Pismenny <borisp@...lanox.com>
>> + *	Copyright (C) 2020 Mellanox Technologies.
>> + */
>> +#ifndef _TCP_DDP_H
>> +#define _TCP_DDP_H
>> +
>> +#include <linux/blkdev.h>
> Why is blkdev.h needed?

That's a lefotover from a previous iteration over this code. I'll remove it for the next patch.

>
>> +#include <linux/netdevice.h>
>> +#include <net/inet_connection_sock.h>
>> +#include <net/sock.h>
>> +
>> +/* limits returned by the offload driver, zero means don't care */
>> +struct tcp_ddp_limits {
>> +	int	 max_ddp_sgl_len;
>> +};
>> +
>> +enum tcp_ddp_type {
>> +	TCP_DDP_NVME = 1,
>> +};
>> +
>> +struct tcp_ddp_config {
>> +	enum tcp_ddp_type    type;
>> +	unsigned char        buf[];
> A little kdoc may help here as its not exactly clear what is
> buf used for (at this point at least)...

Will add.

>> +};
>> +
>> +struct nvme_tcp_config {
> struct nvme_tcp_ddp_config

Sure.

>> +	struct tcp_ddp_config   cfg;
>> +
>> +	u16			pfv;
>> +	u8			cpda;
>> +	u8			dgst;
>> +	int			queue_size;
>> +	int			queue_id;
>> +	int			io_cpu;
>> +};
>> +
> Other than that this looks good to me.
Thanks Sagi!