f3e7afe2d7
- Add RATELIMIT kernel configuration keyword which must be set to enable the new functionality. - Add support for hardware driven, Receive Side Scaling, RSS aware, rate limited sendqueues and expose the functionality through the already established SO_MAX_PACING_RATE setsockopt(). The API support rates in the range from 1 to 4Gbytes/s which are suitable for regular TCP and UDP streams. The setsockopt(2) manual page has been updated. - Add rate limit function callback API to "struct ifnet" which supports the following operations: if_snd_tag_alloc(), if_snd_tag_modify(), if_snd_tag_query() and if_snd_tag_free(). - Add support to ifconfig to view, set and clear the IFCAP_TXRTLMT flag, which tells if a network driver supports rate limiting or not. - This patch also adds support for rate limiting through VLAN and LAGG intermediate network devices. - How rate limiting works: 1) The userspace application calls setsockopt() after accepting or making a new connection to set the rate which is then stored in the socket structure in the kernel. Later on when packets are transmitted a check is made in the transmit path for rate changes. A rate change implies a non-blocking ifp->if_snd_tag_alloc() call will be made to the destination network interface, which then sets up a custom sendqueue with the given rate limitation parameter. A "struct m_snd_tag" pointer is returned which serves as a "snd_tag" hint in the m_pkthdr for the subsequently transmitted mbufs. 2) When the network driver sees the "m->m_pkthdr.snd_tag" different from NULL, it will move the packets into a designated rate limited sendqueue given by the snd_tag pointer. It is up to the individual drivers how the rate limited traffic will be rate limited. 3) Route changes are detected by the NIC drivers in the ifp->if_transmit() routine when the ifnet pointer in the incoming snd_tag mismatches the one of the network interface. The network adapter frees the mbuf and returns EAGAIN which causes the ip_output() to release and clear the send tag. Upon next ip_output() a new "snd_tag" will be tried allocated. 4) When the PCB is detached the custom sendqueue will be released by a non-blocking ifp->if_snd_tag_free() call to the currently bound network interface. Reviewed by: wblock (manpages), adrian, gallatin, scottl (network) Differential Revision: https://reviews.freebsd.org/D3687 Sponsored by: Mellanox Technologies MFC after: 3 months
65 lines
1.7 KiB
Makefile
65 lines
1.7 KiB
Makefile
# $FreeBSD$
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#
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# Common code to marry kernel config(8) goo and module building goo.
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#
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# Generate options files that otherwise would be built
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# in substantially similar ways through the tree. Move
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# the code here when they all produce identical results
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# (or should)
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.if !defined(KERNBUILDDIR)
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opt_bpf.h:
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echo "#define DEV_BPF 1" > ${.TARGET}
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.if ${MK_INET_SUPPORT} != "no"
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opt_inet.h:
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@echo "#define INET 1" > ${.TARGET}
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@echo "#define TCP_OFFLOAD 1" >> ${.TARGET}
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.endif
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.if ${MK_INET6_SUPPORT} != "no"
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opt_inet6.h:
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@echo "#define INET6 1" > ${.TARGET}
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.endif
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.if ${MK_RATELIMIT} != "no"
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opt_ratelimit.h:
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@echo "#define RATELIMIT 1" > ${.TARGET}
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.endif
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.if ${MK_EISA} != "no"
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opt_eisa.h:
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@echo "#define DEV_EISA 1" > ${.TARGET}
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.endif
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opt_mrouting.h:
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echo "#define MROUTING 1" > ${.TARGET}
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opt_natm.h:
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echo "#define NATM 1" > ${.TARGET}
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opt_scsi.h:
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echo "#define SCSI_DELAY 15000" > ${.TARGET}
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opt_wlan.h:
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echo "#define IEEE80211_DEBUG 1" > ${.TARGET}
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echo "#define IEEE80211_AMPDU_AGE 1" >> ${.TARGET}
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echo "#define IEEE80211_SUPPORT_MESH 1" >> ${.TARGET}
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KERN_OPTS.i386=NEW_PCIB DEV_PCI
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KERN_OPTS.pc98=NEW_PCIB DEV_PCI
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KERN_OPTS.amd64=NEW_PCIB DEV_PCI
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KERN_OPTS.powerpc=NEW_PCIB DEV_PCI
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KERN_OPTS=MROUTING NATM IEEE80211_DEBUG \
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IEEE80211_AMPDU_AGE IEEE80211_SUPPORT_MESH DEV_BPF \
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${KERN_OPTS.${MACHINE}} ${KERN_OPTS_EXTRA}
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.if ${MK_INET_SUPPORT} != "no"
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KERN_OPTS+= INET TCP_OFFLOAD
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.endif
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.if ${MK_INET6_SUPPORT} != "no"
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KERN_OPTS+= INET6
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.endif
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.if ${MK_EISA} != "no"
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KERN_OPTS+= DEV_EISA
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.endif
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.elif !defined(KERN_OPTS)
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KERN_OPTS!=cat ${KERNBUILDDIR}/opt*.h | awk '{print $$2;}' | sort -u
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.export KERN_OPTS
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.endif
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.if !defined(NO_MODULES) && !defined(__MPATH)
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__MPATH!=find ${SYSDIR:tA}/ -name \*_if.m
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.export __MPATH
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.endif
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