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From: Jinpu Wang <jinpu.wang@cloud.ionos.com>
To: Leon Romanovsky <leon@kernel.org>
Cc: Jack Wang <jinpuwang@gmail.com>,
	linux-block@vger.kernel.org, linux-rdma@vger.kernel.org,
	Jens Axboe <axboe@kernel.dk>,
	Christoph Hellwig <hch@infradead.org>,
	Sagi Grimberg <sagi@grimberg.me>,
	Bart Van Assche <bvanassche@acm.org>,
	Doug Ledford <dledford@redhat.com>,
	Jason Gunthorpe <jgg@ziepe.ca>,
	Danil Kipnis <danil.kipnis@cloud.ionos.com>,
	Roman Penyaev <rpenyaev@suse.de>
Subject: Re: [PATCH v7 04/25] RDMA/rtrs: core: lib functions shared between client and server modules
Date: Mon, 20 Jan 2020 15:08:00 +0100
Message-ID: <CAMGffE=2OZLkBsaANFvcy80Se8rbs+s0VTL3=2WKpiQP-LxiuA@mail.gmail.com> (raw)
In-Reply-To: <20200120133006.GG51881@unreal>

On Mon, Jan 20, 2020 at 2:30 PM Leon Romanovsky <leon@kernel.org> wrote:
>
> On Mon, Jan 20, 2020 at 12:32:00PM +0100, Jinpu Wang wrote:
> > On Sun, Jan 19, 2020 at 3:48 PM Leon Romanovsky <leon@kernel.org> wrote:
> > >
> > > On Thu, Jan 16, 2020 at 01:58:54PM +0100, Jack Wang wrote:
> > > > From: Jack Wang <jinpu.wang@cloud.ionos.com>
> > > >
> > > > This is a set of library functions existing as a rtrs-core module,
> > > > used by client and server modules.
> > > >
> > > > Mainly these functions wrap IB and RDMA calls and provide a bit higher
> > > > abstraction for implementing of RTRS protocol on client or server
> > > > sides.
> > > >
> > > > Signed-off-by: Danil Kipnis <danil.kipnis@cloud.ionos.com>
> > > > Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
> > > > ---
> > > >  drivers/infiniband/ulp/rtrs/rtrs.c | 597 +++++++++++++++++++++++++++++
> > > >  1 file changed, 597 insertions(+)
> > > >  create mode 100644 drivers/infiniband/ulp/rtrs/rtrs.c
> > > >
> > > > diff --git a/drivers/infiniband/ulp/rtrs/rtrs.c b/drivers/infiniband/ulp/rtrs/rtrs.c
> > > > new file mode 100644
> > > > index 000000000000..7b84d76e2a67
> > > > --- /dev/null
> > > > +++ b/drivers/infiniband/ulp/rtrs/rtrs.c
> > > > @@ -0,0 +1,597 @@
> > > > +// SPDX-License-Identifier: GPL-2.0-or-later
> > > > +/*
> > > > + * RDMA Transport Layer
> > > > + *
> > > > + * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
> > > > + *
> > > > + * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
> > > > + *
> > > > + * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
> > > > + */
> > > > +#undef pr_fmt
> > > > +#define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt
> > > > +
> > > > +#include <linux/module.h>
> > > > +#include <linux/inet.h>
> > > > +
> > > > +#include "rtrs-pri.h"
> > > > +#include "rtrs-log.h"
> > > > +
> > > > +MODULE_DESCRIPTION("RDMA Transport Core");
> > > > +MODULE_LICENSE("GPL");
> > > > +
> > > > +struct rtrs_iu *rtrs_iu_alloc(u32 queue_size, size_t size, gfp_t gfp_mask,
> > > > +                           struct ib_device *dma_dev,
> > > > +                           enum dma_data_direction dir,
> > > > +                           void (*done)(struct ib_cq *cq, struct ib_wc *wc))
> > > > +{
> > > > +     struct rtrs_iu *ius, *iu;
> > > > +     int i;
> > > > +
> > > > +     WARN_ON(!queue_size);
> > > > +     ius = kcalloc(queue_size, sizeof(*ius), gfp_mask);
> > > > +     if (unlikely(!ius))
> > > > +             return NULL;
> > >
> > > Let's do not add useless WARN_ON() and unlikely to every error path.
> > I can remove the WARN_ON, but the unlikey for error case seems normal to use,
> > small size memory allocation is unlikely to fail.
>
> The unlikely() makes sense in data-path only and mostly it doesn't give
> any performance advantage, kcalloc() in this function means that this
> function is not performance oriented.
>

Thanks for the clarification, it is not in the data path, sure can be
removed, we will review the usage
and remove the unnecessary ones.

  reply index

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-16 12:58 [PATCH v7 00/25] RTRS (former IBTRS) RDMA Transport Library and RNBD (former IBNBD) RDMA Network Block Device Jack Wang
2020-01-16 12:58 ` [PATCH v7 01/25] sysfs: export sysfs_remove_file_self() Jack Wang
2020-01-16 12:58 ` [PATCH v7 02/25] RDMA/rtrs: public interface header to establish RDMA connections Jack Wang
2020-01-16 12:58 ` [PATCH v7 03/25] RDMA/rtrs: private headers with rtrs protocol structs and helpers Jack Wang
2020-01-16 12:58 ` [PATCH v7 04/25] RDMA/rtrs: core: lib functions shared between client and server modules Jack Wang
2020-01-19 14:48   ` Leon Romanovsky
2020-01-20 11:32     ` Jinpu Wang
2020-01-20 13:30       ` Leon Romanovsky
2020-01-20 14:08         ` Jinpu Wang [this message]
2020-01-16 12:58 ` [PATCH v7 05/25] RDMA/rtrs: client: private header with client structs and functions Jack Wang
2020-01-16 12:58 ` [PATCH v7 06/25] RDMA/rtrs: client: main functionality Jack Wang
2020-01-16 14:53   ` Leon Romanovsky
2020-01-16 15:43     ` Jinpu Wang
2020-01-16 15:53       ` Jason Gunthorpe
2020-01-16 16:48         ` Jinpu Wang
2020-01-16 15:58       ` Leon Romanovsky
2020-01-16 16:24         ` Jinpu Wang
2020-01-18 10:12           ` Leon Romanovsky
2020-01-20 11:24             ` Jinpu Wang
2020-01-16 12:58 ` [PATCH v7 07/25] RDMA/rtrs: client: statistics functions Jack Wang
2020-01-16 12:58 ` [PATCH v7 08/25] RDMA/rtrs: client: sysfs interface functions Jack Wang
2020-01-16 12:58 ` [PATCH v7 09/25] RDMA/rtrs: server: private header with server structs and functions Jack Wang
2020-01-16 12:59 ` [PATCH v7 10/25] RDMA/rtrs: server: main functionality Jack Wang
2020-01-16 12:59 ` [PATCH v7 11/25] RDMA/rtrs: server: statistics functions Jack Wang
2020-01-16 12:59 ` [PATCH v7 12/25] RDMA/rtrs: server: sysfs interface functions Jack Wang
2020-01-16 12:59 ` [PATCH v7 13/25] RDMA/rtrs: include client and server modules into kernel compilation Jack Wang
2020-01-16 12:59 ` [PATCH v7 14/25] RDMA/rtrs: a bit of documentation Jack Wang
2020-01-16 12:59 ` [PATCH v7 15/25] block/rnbd: private headers with rnbd protocol structs and helpers Jack Wang
2020-01-16 12:59 ` [PATCH v7 16/25] block/rnbd: client: private header with client structs and functions Jack Wang
2020-01-16 12:59 ` [PATCH v7 17/25] block/rnbd: client: main functionality Jack Wang
2020-01-20 13:48   ` Leon Romanovsky
2020-01-20 17:30     ` Jinpu Wang
2020-01-22 12:31       ` Leon Romanovsky
2020-01-22 12:52         ` Jinpu Wang
2020-01-22 11:22     ` Jinpu Wang
2020-01-22 12:25       ` Leon Romanovsky
2020-01-22 13:12         ` Jinpu Wang
2020-01-22 14:07           ` Leon Romanovsky
2020-01-22 14:18             ` Jinpu Wang
2020-01-16 12:59 ` [PATCH v7 18/25] block/rnbd: client: sysfs interface functions Jack Wang
2020-01-16 12:59 ` [PATCH v7 19/25] block/rnbd: server: private header with server structs and functions Jack Wang
2020-01-16 12:59 ` [PATCH v7 20/25] block/rnbd: server: main functionality Jack Wang
2020-01-16 12:59 ` [PATCH v7 21/25] block/rnbd: server: functionality for IO submission to file or block dev Jack Wang
2020-01-16 12:59 ` [PATCH v7 22/25] block/rnbd: server: sysfs interface functions Jack Wang
2020-01-16 12:59 ` [PATCH v7 23/25] block/rnbd: include client and server modules into kernel compilation Jack Wang
2020-01-16 14:40   ` Leon Romanovsky
2020-01-16 14:54     ` Jinpu Wang
2020-01-16 15:59       ` Leon Romanovsky
2020-01-16 16:53         ` Jinpu Wang
2020-01-16 12:59 ` [PATCH v7 24/25] block/rnbd: a bit of documentation Jack Wang
2020-01-16 12:59 ` [PATCH v7 25/25] MAINTAINERS: Add maintainers for RNBD/RTRS modules Jack Wang

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