linux-kernel - Re: [RFC PATCH rdma-next 05/10] RDMA/rxe: Allow registering persistent flag for pmem MR only

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Date:   Fri, 31 Dec 2021 09:40:12 -0500
From:   Tom Talpey <tom@...pey.com>
To:     "lizhijian@...itsu.com" <lizhijian@...itsu.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "zyjzyj2000@...il.com" <zyjzyj2000@...il.com>,
        "jgg@...pe.ca" <jgg@...pe.ca>,
        "aharonl@...dia.com" <aharonl@...dia.com>,
        "leon@...nel.org" <leon@...nel.org>
Cc:     "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 05/10] RDMA/rxe: Allow registering
 persistent flag for pmem MR only

On 12/30/2021 10:34 PM, lizhijian@...itsu.com wrote:

>>>    +static bool ib_check_flush_access_flags(struct ib_mr *mr, u32 flags)
>>> +{
>>> +    return mr->is_pmem || !(flags & IB_ACCESS_FLUSH_PERSISTENT);
>>> +}

>> Its name is confusing and needs to be clarified.
> 
> Err,  let me see.... a more suitable name is very welcome.

Since the subroutine is rather simple, and with only a single
reference in a single file, it would be best to just pull
the test inline and delete it. This would also remove some
inefficient code.

  	if (flags & IB_ACCESS_FLUSH_PERSISTENT) {
		if (!iova_in_pmem(mr, iova, length) {
			pr_err("Cannot set IB_ACCESS_FLUSH_PERSISTENT for non-pmem memory\n");
			mr->state = RXE_MR_STATE_INVALID;
			mr->umem = NULL;
			err = -EINVAL;
			goto err_release_umem;
		}
		mr-> ibmr.is_pmem = true;
	}
...