linux-kernel - Re: [RFC PATCH rdma-next 08/10] RDMA/rxe: Implement flush execution in responder side

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Message-ID: <347eb51d-6b0c-75fb-e27f-6bf4969125fe@fujitsu.com>
Date:   Thu, 6 Jan 2022 06:42:57 +0000
From:   "lizhijian@...itsu.com" <lizhijian@...itsu.com>
To:     Jason Gunthorpe <jgg@...pe.ca>,
        "lizhijian@...itsu.com" <lizhijian@...itsu.com>
CC:     "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "zyjzyj2000@...il.com" <zyjzyj2000@...il.com>,
        "aharonl@...dia.com" <aharonl@...dia.com>,
        "leon@...nel.org" <leon@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mbloch@...dia.com" <mbloch@...dia.com>,
        "liweihang@...wei.com" <liweihang@...wei.com>,
        "liangwenpeng@...wei.com" <liangwenpeng@...wei.com>,
        "yangx.jy@...itsu.com" <yangx.jy@...itsu.com>,
        "rpearsonhpe@...il.com" <rpearsonhpe@...il.com>,
        "y-goto@...itsu.com" <y-goto@...itsu.com>
Subject: Re: [RFC PATCH rdma-next 08/10] RDMA/rxe: Implement flush execution
 in responder side



On 06/01/2022 08:28, Jason Gunthorpe wrote:
> On Tue, Dec 28, 2021 at 04:07:15PM +0800, Li Zhijian wrote:
>> +	while (length > 0) {
>> +		va	= (u8 *)(uintptr_t)buf->addr + offset;
>> +		bytes	= buf->size - offset;
>> +
>> +		if (bytes > length)
>> +			bytes = length;
>> +
>> +		arch_wb_cache_pmem(va, bytes);
> So why did we need to check that the va was pmem to call this?
Sorry, i didn't get you.

I didn't check whether va is pmem, since only MR registered with PERSISTENCE(only pmem can
register this access flag) can reach here.

Thanks
Zhijian


>
> Jason