netdev - Re: [PATCH v21 06/20] nvme-tcp: Add DDP data-path

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Date: Mon, 18 Dec 2023 20:08:52 +0200
From: Aurelien Aptel <aaptel@...dia.com>
To: Max Gurtovoy <mgurtovoy@...dia.com>, linux-nvme@...ts.infradead.org,
 netdev@...r.kernel.org, sagi@...mberg.me, hch@....de, kbusch@...nel.org,
 axboe@...com, chaitanyak@...dia.com, davem@...emloft.net, kuba@...nel.org
Cc: Boris Pismenny <borisp@...dia.com>, aurelien.aptel@...il.com,
 smalin@...dia.com, malin1024@...il.com, ogerlitz@...dia.com,
 yorayz@...dia.com, galshalom@...dia.com
Subject: Re: [PATCH v21 06/20] nvme-tcp: Add DDP data-path

Max Gurtovoy <mgurtovoy@...dia.com> writes:
>> +
>> +	if (nvme_tcp_is_ddp_offloaded(req)) {
>
> Same optimization here:
>
> if (IS_ENABLED(CONFIG_ULP_DDP) && nvme_tcp_is_ddp_offloaded(req)) {
>

nvme_tcp_is_ddp_offloaded() compiles to "return false" when ULP_DDP is
disabled and the compiler already folds the branching completely.

>
> if (IS_ENABLED(CONFIG_ULP_DDP) && test_bit(NVME_TCP_Q_OFF_DDP, 
> &queue->flags))
>

Same, I've checked and the test is already optimized out.

Thanks