From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ye Xiaolong <xiaolong.ye@intel.com>
Subject: Re: [PATCH v9 1/1] net/af_xdp: introduce AF XDP PMD
	driver
Date: Wed, 3 Apr 2019 17:59:39 +0800
Message-ID: <20190403095939.GA32340@intel.com>
References: <20190301080947.91086-1-xiaolong.ye@intel.com>
 <20190402154653.711-1-xiaolong.ye@intel.com>
 <20190402154653.711-2-xiaolong.ye@intel.com>
 <d2bf5816f98d715ff6e0575930f233e8b45732de.camel@debian.org>
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Cc: dev@dpdk.org, Stephen Hemminger <stephen@networkplumber.org>,
 Ferruh Yigit <ferruh.yigit@intel.com>, Qi Zhang <qi.z.zhang@intel.com>,
 Karlsson Magnus <magnus.karlsson@intel.com>,
 Topel Bjorn <bjorn.topel@intel.com>,
 Maxime Coquelin <maxime.coquelin@redhat.com>,
 Bruce Richardson <bruce.richardson@intel.com>,
 Ananyev Konstantin <konstantin.ananyev@intel.com>,
 David Marchand <david.marchand@redhat.com>,
 Andrew Rybchenko <arybchenko@solarflare.com>,
 Olivier Matz <olivier.matz@6wind.com>
To: Luca Boccassi <bluca@debian.org>
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Hi, Luca

On 04/02, Luca Boccassi wrote:
>On Tue, 2019-04-02 at 23:46 +0800, Xiaolong Ye wrote:
>> diff --git a/drivers/net/af_xdp/Makefile
>> b/drivers/net/af_xdp/Makefile
>> new file mode 100644
>> index 000000000..8343e3016
>> --- /dev/null
>> +++ b/drivers/net/af_xdp/Makefile
>> @@ -0,0 +1,32 @@
>> +# SPDX-License-Identifier: BSD-3-Clause
>> +# Copyright(c) 2019 Intel Corporation
>> +
>> +include $(RTE_SDK)/mk/rte.vars.mk
>> +
>> +#
>> +# library name
>> +#
>> +LIB = librte_pmd_af_xdp.a
>> +
>> +EXPORT_MAP := rte_pmd_af_xdp_version.map
>> +
>> +LIBABIVER := 1
>> +
>> +CFLAGS += -O3
>> +
>> +# require kernel version >= v5.1-rc1
>> +CFLAGS += -I$(RTE_KERNELDIR)/tools/include
>> +CFLAGS += -I$(RTE_KERNELDIR)/tools/lib/bpf
>
>Sorry for not noticing this before, but doesn't this require the full
>kernel tree rather than just the typical headers package? Requiring the
>full kernel tree to be available at build time will make this
>unbuildable on distros that still use makefiles, like RHEL and SUSE. At
>least on Debian and Ubuntu, the kernel headers packages distributed do
>not include the full kernel tree, only the headers, so there's no
>tools/lib or tools/include.

Currently we do have dependencies on the kernel src tree, as xsk.h and
asm/barrier wouldn't be installed by libbpf, so before libbpf handles these
properly, can we keep the current RTE_KERNELDIR in Makefile for now, and mention
the dependencies in document, also suggest users to config RTE_KERNELDIR to correct
kernel src tree if they want to use af_xdp pmd?

Something like:

dependencies:
- kernel source code (>= v5.1-rc1)
- build libbfp and install

Thanks,
Xiaolong
>
>Like other dependencies, this should assume they are installed as
>regular libraries, eg:
>
>CFLAGS += $(shell command -v pkg-config > /dev/null 2>&1 && pkg-config --cflags libbpf || echo "-I/usr/include/bpf")
>
>> +CFLAGS += $(WERROR_FLAGS)
>> +LDLIBS += -lrte_eal -lrte_mbuf -lrte_mempool -lrte_ring
>> +LDLIBS += -lrte_ethdev -lrte_net -lrte_kvargs
>> +LDLIBS += -lrte_bus_vdev
>> +LDLIBS += -lbpf
>
>LDLIBS += $(shell command -v pkg-config > /dev/null 2>&1 && pkg-config --libs libbpf || echo "-lbpf")
>
>-- 
>Kind regards,
>Luca Boccassi