manuals: Fix syntax of list width

Signed-off-by: Graham Percival <gperciva@tarsnap.com>
Reviewed by: mhorne
MFC after: 3 days
Sponsored by: Tarsnap Backup Inc.
Pull Request: https://github.com/freeb

manuals: Fix syntax of list width

Signed-off-by: Graham Percival <gperciva@tarsnap.com>
Reviewed by: mhorne
MFC after: 3 days
Sponsored by: Tarsnap Backup Inc.
Pull Request: https://github.com/freebsd/freebsd-src/pull/1455

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mbuf.9: Document mtodo

mtodo() accepts an mbuf and offset and returns a void * pointer to the
requested offset into the mbuf's associated data. Similar to mtod(),
no bounds checking is performed.

mbuf.9: Document mtodo

mtodo() accepts an mbuf and offset and returns a void * pointer to the
requested offset into the mbuf's associated data. Similar to mtod(),
no bounds checking is performed.

Reviewed by: imp, markj
Sponsored by: Chelsio Communications
Differential Revision: https://reviews.freebsd.org/D43215

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Remove $FreeBSD$: two-line nroff pattern

Remove /^\.\\"\n\.\\"\s*\$FreeBSD\$$\n/

mbuf(9): Remove two double words in the manual page

- s/is is/is/

MFC after: 1 week

Introduce m_get3()

Introduce m_get3() which is similar to m_get2(), but can allocate up to
MJUM16BYTES bytes (m_get2() can only allocate up to MJUMPAGESIZE).

This simplifies the bpf improvement in

Introduce m_get3()

Introduce m_get3() which is similar to m_get2(), but can allocate up to
MJUM16BYTES bytes (m_get2() can only allocate up to MJUMPAGESIZE).

This simplifies the bpf improvement in f13da24715.

Suggested by: glebius
Differential Revision: https://reviews.freebsd.org/D31455

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sed(1): Add a reference for a 4.4BSD manual document

Obtained from: OpenBSD
MFC after: 1 week

Catch up with 6edfd179c86: document M_EXTPG. While here sore flags
as they are in sys/mbuf.h

mbuf(9): Some markup fixes

- whitespace at end of input line
- no blank before trailing delimiter: Dv MJUM16BYTES

MFC after: 3 days

MFH

Sponsored by: Rubicon Communications, LLC (netgate.com)

fix up docs for m_getjcl as well..

document that m_get2 only accepts up to MJUMPAGESIZE..

MFHead @r350386

Sponsored by: The FreeBSD Foundation

Add an external mbuf buffer type that holds multiple unmapped pages.

Unmapped mbufs allow sendfile to carry multiple pages of data in a
single mbuf, without mapping those pages. It is a requirement

Add an external mbuf buffer type that holds multiple unmapped pages.

Unmapped mbufs allow sendfile to carry multiple pages of data in a
single mbuf, without mapping those pages. It is a requirement for
Netflix's in-kernel TLS, and provides a 5-10% CPU savings on heavy web
serving workloads when used by sendfile, due to effectively
compressing socket buffers by an order of magnitude, and hence
reducing cache misses.

For this new external mbuf buffer type (EXT_PGS), the ext_buf pointer
now points to a struct mbuf_ext_pgs structure instead of a data
buffer. This structure contains an array of physical addresses (this
reduces cache misses compared to an earlier version that stored an
array of vm_page_t pointers). It also stores additional fields needed
for in-kernel TLS such as the TLS header and trailer data that are
currently unused. To more easily detect these mbufs, the M_NOMAP flag
is set in m_flags in addition to M_EXT.

Various functions like m_copydata() have been updated to safely access
packet contents (using uiomove_fromphys()), to make things like BPF
safe.

NIC drivers advertise support for unmapped mbufs on transmit via a new
IFCAP_NOMAP capability. This capability can be toggled via the new
'nomap' and '-nomap' ifconfig(8) commands. For NIC drivers that only
transmit packet contents via DMA and use bus_dma, adding the
capability to if_capabilities and if_capenable should be all that is
required.

If a NIC does not support unmapped mbufs, they are converted to a
chain of mapped mbufs (using sf_bufs to provide the mapping) in
ip_output or ip6_output. If an unmapped mbuf requires software
checksums, it is also converted to a chain of mapped mbufs before
computing the checksum.

Submitted by: gallatin (earlier version)
Reviewed by: gallatin, hselasky, rrs
Discussed with: ae, kp (firewalls)
Relnotes: yes
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D20616

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Sync mbuf flags, types, and external buffer types with <sys/mbuf.h>.

Sponsored by: Netflix

Use a tab after #define for EXT_* constants.

This matches other #define's in this manpage as well as <sys/mbuf.h>.

Sponsored by: Netflix

Merge ^/head r323559 through r325504.

MFhead@r324482

Shorten list of arguments to mbuf external storage freeing function.

All of these arguments are stored in m_ext, so there is no reason
to pass them in the argument list. Not all functions need the

Shorten list of arguments to mbuf external storage freeing function.

All of these arguments are stored in m_ext, so there is no reason
to pass them in the argument list. Not all functions need the second
argument, some don't even need the first one. The second argument
lives in next cache line, so not dereferencing it is a performance
gain. This was discovered in sendfile(2), which will be covered by
next commits.

The second goal of this commit is to bring even more flexibility
to m_ext mbufs, allowing to create more fields in m_ext, opaque to
the generic mbuf code, and potentially set and dereferenced by
subsystems.

Reviewed by: gallatin, kbowling
Differential Revision: https://reviews.freebsd.org/D12615

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Merge ^/head r306906 through r307382.

mbuf(9), mbuf_tags(9): fix function prototypes.

- Add m_getclr(9) symlink to ObsoleteFiles.inc (removed in r295481).
- Add const qualifiers in m_dup(), m_dup_pkthdr() and m_tag_copy_chain()
(r286450

mbuf(9), mbuf_tags(9): fix function prototypes.

- Add m_getclr(9) symlink to ObsoleteFiles.inc (removed in r295481).
- Add const qualifiers in m_dup(), m_dup_pkthdr() and m_tag_copy_chain()
(r286450).
- Fix m_dup_pkthdr() definition (it's not the same as m_move_pkthdr()).

MFC after: 5 days

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MFhead @ r305170

Merge ^/head r305029 through r305080.

Update a comment to reflect r305051.

Merge ^/head r296007 through r296368.

MFH

Sponsored by: The FreeBSD Foundation