meson option to customize RTE_PKTMBUF_HEADROOM patch

[Parthakumar Roy <Parthakumar.Roy@ibm.com>]

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Hello,
Bruce Richardson suggested that I submit this patch - at IBM we needed to adjust the pkt_mbuf_headroom​ for our application to work. This is my first ever patch through a mailing list, I have only done it through Pull Requests before, so let me know if I need to correct something.

Message:
    Add meson configuration option to adjust RTE_PKTMBUF_HEADROOM


diff --git a/config/meson.build b/config/meson.build

index 7cd375e991..43b765ade1 100644

--- a/config/meson.build

+++ b/config/meson.build

@@ -304,6 +304,7 @@ endforeach

 dpdk_conf.set('RTE_MAX_ETHPORTS', get_option('max_ethports'))

 dpdk_conf.set('RTE_LIBEAL_USE_HPET', get_option('use_hpet'))

 dpdk_conf.set('RTE_ENABLE_TRACE_FP', get_option('enable_trace_fp'))

+dpdk_conf.set('RTE_PKTMBUF_HEADROOM', get_option('pkt_mbuf_headroom'))

 # values which have defaults which may be overridden

 dpdk_conf.set('RTE_MAX_VFIO_GROUPS', 64)

 dpdk_conf.set('RTE_DRIVER_MEMPOOL_BUCKET_SIZE_KB', 64)

diff --git a/config/rte_config.h b/config/rte_config.h

index 7b8c85e948..a2bb4ea61b 100644

--- a/config/rte_config.h

+++ b/config/rte_config.h

@@ -51,7 +51,6 @@



 /* mbuf defines */

 #define RTE_MBUF_DEFAULT_MEMPOOL_OPS "ring_mp_mc"

-#define RTE_PKTMBUF_HEADROOM 128



 /* ether defines */

 #define RTE_MAX_QUEUES_PER_PORT 1024

diff --git a/meson_options.txt b/meson_options.txt

index 08528492f7..169fcc94c7 100644

--- a/meson_options.txt

+++ b/meson_options.txt

@@ -36,6 +36,8 @@ option('machine', type: 'string', value: 'auto', description:

        'Alias of cpu_instruction_set.')

 option('max_ethports', type: 'integer', value: 32, description:

        'maximum number of Ethernet devices')

+option('pkt_mbuf_headroom', type: 'integer', value: 128, description:

+       'number of bytes skipped on Rx at the start of the packet buffer to leave room for additional packet headers')

 option('max_lcores', type: 'string', value: 'default', description:

        'Set maximum number of cores/threads supported by EAL; "default" is different per-arch, "detect" detects the number of cores on the build machine.')

 option('max_numa_nodes', type: 'string', value: 'default', description:


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