Set lib/ DEBUG mode default.

FF_USE_PAGE_ARRAY compatible DPDK 20.11.

Support zero copy while call `ff_write`, you can enable it by modify ‘FF_ZC_SEND=1' in `lib/Makefile`.

`FF_ZC_SEND` is same as `FF_USE_PAGE_ARRAY`, it will improve performance slightly in some scena

Support zero copy while call `ff_write`, you can enable it by modify ‘FF_ZC_SEND=1' in `lib/Makefile`.

`FF_ZC_SEND` is same as `FF_USE_PAGE_ARRAY`, it will improve performance slightly in some scenarios, need to be tested in combination with real applications.

You can enable both compilation options at the same time or separately.

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remove for loop

remove cmsg_len error

ff_syscall_wrapper.c: add linux_cmsghdr and its support in recvmsg
add support for IP_RECVTTL and IP_RECVTOS

Optimize random function in ff_compat.c

FF_USE_PAGE_ARRAY compatible DPDK 19.11.

Avoid leaks after errors in freebsd config handler

Freeing allocated memory in an error flow. Currently this would
most likely not occure but a safeguard for future changes.

Renaming vip6_cfg_hander() to vip6_cfg_handler()

Corrected the output of an error log as well.

Correcting check of config value for vip_addr6

Updated for code consistency, but checking the IPv4 vip_addr
pointer might have given problems for IPv6 only configs.

Revert "Fix 'FF_KNI' ifdef in Makefile"

Fix 'FF_KNI' ifdef in Makefile

Add support to set interface name of each port in `config.ini`.

Add support for multiple `pci_whitelist` in `config.ini`.

fix ‘__uintptr_t’ error.

fix kqueue can't add multi event onetime, modify struct event fromm freebsd11 to freebsd13.

Modify net.inet.tcp.functions_default from bbr to freebsd, because extra
stacks(bbr and rack) can't work normaly now.

Netgraph and ipfw for FreeBSD 13.0.

Support extra tcp stacks, rack and bbr.

modify licence.

Update LICENCE.

Add lib/ff_subr_epoch.c.

FreeBSD13 can simply work.

fix some issues.