Re: [dpdk-dev] [ [PATCH v2] 10/13] include/exec-env: ioport: add rte_virt_ioport header file

[Jerin Jacob <jerin.jacob@caviumnetworks.com>]

On Mon, Dec 14, 2015 at 06:30:29PM +0530, Santosh Shukla wrote:
> including virtio_ioport header file has iopci bar page_size, bar_len and
> device filename info.
> 
> Signed-off-by: Santosh Shukla <sshukla@mvista.com>
> ---
>  lib/librte_eal/linuxapp/eal/Makefile               |    2 +-
>  .../eal/include/exec-env/rte_virt_ioport.h         |   81 ++++++++++++++++++++
>  2 files changed, 82 insertions(+), 1 deletion(-)
>  create mode 100644 lib/librte_eal/linuxapp/eal/include/exec-env/rte_virt_ioport.h
> 
> diff --git a/lib/librte_eal/linuxapp/eal/Makefile b/lib/librte_eal/linuxapp/eal/Makefile
> index 26eced5..1252e05 100644
> --- a/lib/librte_eal/linuxapp/eal/Makefile
> +++ b/lib/librte_eal/linuxapp/eal/Makefile
> @@ -115,7 +115,7 @@ ifeq ($(CONFIG_RTE_TOOLCHAIN_GCC),y)
>  CFLAGS_eal_thread.o += -Wno-return-type
>  endif
>  
> -INC := rte_interrupts.h rte_kni_common.h rte_dom0_common.h
> +INC := rte_interrupts.h rte_kni_common.h rte_dom0_common.h rte_virt_ioport.h
>  
>  SYMLINK-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP)-include/exec-env := \
>  	$(addprefix include/exec-env/,$(INC))
> diff --git a/lib/librte_eal/linuxapp/eal/include/exec-env/rte_virt_ioport.h b/lib/librte_eal/linuxapp/eal/include/exec-env/rte_virt_ioport.h
> new file mode 100644
> index 0000000..8098eaf
> --- /dev/null
> +++ b/lib/librte_eal/linuxapp/eal/include/exec-env/rte_virt_ioport.h
> @@ -0,0 +1,81 @@
> +/*
> + *   This file is provided under a dual BSD/LGPLv2 license.  When using or
> + *   redistributing this file, you may do so under either license.
> + *
> + *   GNU LESSER GENERAL PUBLIC LICENSE
> + *
> + *   Copyright(c) 2015 Cavium Networks. All rights reserved.
> + *   All rights reserved.
> + *
> + *   This program is free software; you can redistribute it and/or modify
> + *   it under the terms of version 2.1 of the GNU Lesser General Public License
> + *   as published by the Free Software Foundation.
> + *
> + *   This program is distributed in the hope that it will be useful, but
> + *   WITHOUT ANY WARRANTY; without even the implied warranty of
> + *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + *   Lesser General Public License for more details.
> + *
> + *   You should have received a copy of the GNU Lesser General Public License
> + *   along with this program; if not, write to the Free Software
> + *   Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
> + *
> + *   Contact Information:
> + *   Cavium Networks
> + *
> + *
> + *   BSD LICENSE
> + *
> + *   Copyright(c) 2015 Cavium Networks. All rights reserved.
> + *   All rights reserved.
> + *
> + *   Redistribution and use in source and binary forms, with or without
> + *   modification, are permitted provided that the following conditions
> + *   are met:
> + *
> + *   * Redistributions of source code must retain the above copyright
> + *     notice, this list of conditions and the following disclaimer.
> + *   * Redistributions in binary form must reproduce the above copyright
> + *     notice, this list of conditions and the following disclaimer in
> + *     the documentation and/or other materials provided with the
> + *     distribution.
> + *   * Neither the name of Intel Corporation nor the names of its
> + *     contributors may be used to endorse or promote products derived
> + *     from this software without specific prior written permission.
> + *
> + *    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
> + *    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
> + *    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
> + *    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
> + *    OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
> + *    SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
> + *    LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
> + *    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
> + *    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> + *    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
> + *    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> + *
> + */
> +#ifndef _RTE_VIRTIO_IOPORT_H_
> +#define _RTE_VIRTIO_IOPORT_H_
> +
> +#define VIRT_IOPORT_DEV		"/dev/igb_ioport"
> +
> +/**
> + * Keeping pci_virt_ioport_size = 4k.
> + * So maximum mmaped pci_iobar supported =
> + * (virt_ioport_size/pci_dev->mem_resource[0].len)
> + * where, pci_dev->mem_resource[0].len == virtio_pci_iobar_len i.e.. 32 byte
> + *
> + * Note: kernel could allow maximum 32 virtio-net-pci interface, that mean
> + * maximum 32 PCI_IOBAR(s) where each PCI_IOBAR_LEN=0x20, so virtio_map_ioport()
> + * func by theory gonna support 4k/0x20 ==> 128 PCI_IOBAR(s), more than
> + * max-virtio-net-pci interface.
> + */
> +#define PAGE_SIZE		4096

IMO, We can remove this PAGE_SIZE macro and set PCI_VIRT_IOPORT_SIZE as
4096 directly. It will remove the confusion between
kernel page size

> +#define PCI_VIRT_IOPORT_SIZE	PAGE_SIZE
> +#define PCI_VIRT_IOBAR_LEN	32
> +#define PCI_VIRT_IOPORT_MAX	(PCI_VIRT_IOPORT_SIZE/PCI_VIRT_IOBAR_LEN)
> +				/* 128 max ioport */
> +
> +#endif /* _RTE_VIRTIO_IOPORT_H_ */
> -- 
> 1.7.9.5
>