Subject: Re: [RFC PATCH v5 12/16] RDMA/irdma: Add miscellaneous utility definitions

From: Leon Romanovsky <[email-masked]>
Date: Tue, 21 Apr 2020 10:30:44 +0300

On Tue, Apr 21, 2020 at 12:27:28AM +0000, Saleem, Shiraz wrote:
> > Subject: Re: [RFC PATCH v5 12/16] RDMA/irdma: Add miscellaneous utility
> > definitions
> >
> > On Fri, Apr 17, 2020 at 10:12:47AM -0700, Jeff Kirsher wrote:
> > > From: Mustafa Ismail <[email-masked]>
> > >
> > > Add miscellaneous utility functions and headers.
> > >
> > > Signed-off-by: Mustafa Ismail <[email-masked]>
> > > Signed-off-by: Shiraz Saleem <[email-masked]>
> > > ---
> > >  drivers/infiniband/hw/irdma/osdep.h  |  105 ++
> > >  drivers/infiniband/hw/irdma/protos.h |   93 +
> > >  drivers/infiniband/hw/irdma/status.h |   69 +
> > >  drivers/infiniband/hw/irdma/utils.c  | 2445
> > > ++++++++++++++++++++++++++
> > >  4 files changed, 2712 insertions(+)
> > >  create mode 100644 drivers/infiniband/hw/irdma/osdep.h
> > >  create mode 100644 drivers/infiniband/hw/irdma/protos.h
> > >  create mode 100644 drivers/infiniband/hw/irdma/status.h
> > >  create mode 100644 drivers/infiniband/hw/irdma/utils.c
> > >
> > > diff --git a/drivers/infiniband/hw/irdma/osdep.h
> > > b/drivers/infiniband/hw/irdma/osdep.h
> > > new file mode 100644
> > > index 000000000000..23ddfb8e9568
> > > --- /dev/null
> > > +++ b/drivers/infiniband/hw/irdma/osdep.h
> > > @@ -0,0 +1,105 @@
> > > +/* SPDX-License-Identifier: GPL-2.0 or Linux-OpenIB */
> > > +/* Copyright (c) 2015 - 2019 Intel Corporation */ #ifndef
> > > +IRDMA_OSDEP_H #define IRDMA_OSDEP_H
> > > +
> > > +#include <linux/version.h>
> >
> > Why is that?
> Not needed. Thanks!
>
> >
> > > +#define irdma_debug_buf(dev, prefix, desc, buf, size)	\
> > > +	print_hex_dump_debug(prefix ": " desc " ",	\
> > > +			     DUMP_PREFIX_OFFSET,	\
> > > +			     16, 8, buf, size, false)
> > > +
> >
> > I think that it can be beneficial to be as ibdev_print_buf().
>
> Macro itself looks a little weird since dev is not used and needs to be fixed.
> I wonder why there isn't a struct device ver. of this print buf
> to start with.
>
> [...]
>
> > > +	IRDMA_ERR_BAD_STAG			= -66,
> > > +	IRDMA_ERR_CQ_COMPL_ERROR		= -67,
> > > +	IRDMA_ERR_Q_DESTROYED			= -68,
> > > +	IRDMA_ERR_INVALID_FEAT_CNT		= -69,
> > > +	IRDMA_ERR_REG_CQ_FULL			= -70,
> > > +	IRDMA_ERR_VF_MSG_ERROR			= -71,
> > > +};
> >
> > Please don't do vertical space alignment in all the places
>
> vertically aligning groups of defines that are related or enum constants
> look more readable.
>
> +       IRDMA_ERR_BAD_STAG = -66,
> +       IRDMA_ERR_CQ_COMPL_ERROR = -67,
> +       IRDMA_ERR_Q_DESTROYED = -68,
> +       IRDMA_ERR_INVALID_FEAT_CNT = -69,
> +       IRDMA_ERR_REG_CQ_FULL = -70,
> +       IRDMA_ERR_VF_MSG_ERROR = -71,
>
> This looks less readable IMHO.

It works well until you need some ridiculous long name to introduce,
for example https://lore.kernel.org/linux-rdma/[email-masked]

>
> >
> > > +#endif /* IRDMA_STATUS_H */
> > > diff --git a/drivers/infiniband/hw/irdma/utils.c
> > > b/drivers/infiniband/hw/irdma/utils.c
> > > new file mode 100644
> > > index 000000000000..be46d672afc5
> > > --- /dev/null
> > > +++ b/drivers/infiniband/hw/irdma/utils.c
> > > @@ -0,0 +1,2445 @@
> > > +// SPDX-License-Identifier: GPL-2.0 or Linux-OpenIB
> > > +/* Copyright (c) 2015 - 2019 Intel Corporation */ #include
> > > +<linux/mii.h> #include <linux/in.h> #include <linux/init.h> #include
> > > +<asm/irq.h> #include <asm/byteorder.h> #include <net/neighbour.h>
> > > +#include "main.h"
> > > +
> > > +/**
> > > + * irdma_arp_table -manage arp table
> > > + * @rf: RDMA PCI function
> > > + * @ip_addr: ip address for device
> > > + * @ipv4: IPv4 flag
> > > + * @mac_addr: mac address ptr
> > > + * @action: modify, delete or add
> > > + */
> > > +int irdma_arp_table(struct irdma_pci_f *rf, u32 *ip_addr, bool ipv4,
> > > +		    u8 *mac_addr, u32 action)
> >
> > ARP table in the RDMA driver looks strange, I see that it is legacy from i40iw, but
> > wonder if it is the right thing to do the same for the new driver.
> >
>
> See response in Patch #1.

OK, let's me rephrase the question.
Why can't you use arp_tbl from include/net/arp.h and need
to implement it in the RDMA driver?

Thanks