IFC @247348.

Sync with HEAD.

Add placeholder constants to reserve a portion of the socket option
name space for use by downstream vendors to add custom options.

MFC after: 2 weeks

Use decimal values for UDP and TCP socket options rather than hex to avoid
implying that these constants should be treated as bit masks.

Reviewed by: net
MFC after: 1 week

MFC

IFC @ r234692

sys/amd64/include/cpufunc.h
sys/amd64/include/fpu.h
sys/amd64/amd64/fpu.c
sys/amd64/vmm/vmm.c

- Add API to allow vmm FPU state init/save/restore.

FP stuff discussed with: kib

IFC @231845

Sponsored by: Cisco Systems, Inc.

Add new socket options: TCP_KEEPINIT, TCP_KEEPIDLE, TCP_KEEPINTVL and
TCP_KEEPCNT, that allow to control initial timeout, idle time, idle
re-send interval and idle send count on a per-socket basis.

Add new socket options: TCP_KEEPINIT, TCP_KEEPIDLE, TCP_KEEPINTVL and
TCP_KEEPCNT, that allow to control initial timeout, idle time, idle
re-send interval and idle send count on a per-socket basis.

Reviewed by: andre, bz, lstewart

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IFC @230489 (pending review).

IFC @ r226824

Add missing #includes.

According to POSIX, these two header files should be able to be included
by themselves, not depending on other headers. The <net/if.h> header
uses struct sockaddr when __BSD_V

Add missing #includes.

According to POSIX, these two header files should be able to be included
by themselves, not depending on other headers. The <net/if.h> header
uses struct sockaddr when __BSD_VISIBLE=1, while <netinet/tcp.h> uses
integer datatypes (u_int32_t, u_short, etc).

MFC after: 2 months

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svn+ssh://svn.freebsd.org/base/head@216199

Sync: merge r215396 through r215463 from ^/head.

Add new, per connection, statistics for TCP, including:
Retransmitted Packets
Zero Window Advertisements
Out of Order Receives

These statistics are available via the -T argument to
netstat(1).
MFC a

Add new, per connection, statistics for TCP, including:
Retransmitted Packets
Zero Window Advertisements
Out of Order Receives

These statistics are available via the -T argument to
netstat(1).
MFC after: 2 weeks

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Merge svn+ssh://svn.freebsd.org/base/head@214309

Remove the TCP inflight bandwidth limiter as announced in r211315
to give way for the pluggable congestion control framework. It is
the task of the congestion control algorithm to set the congestion

Remove the TCP inflight bandwidth limiter as announced in r211315
to give way for the pluggable congestion control framework. It is
the task of the congestion control algorithm to set the congestion
window and amount of inflight data without external interference.

In 'struct tcpcb' the variables previously used by the inflight
limiter are renamed to spares to keep the ABI intact and to have
some more space for future extensions.

In 'struct tcp_info' the variable 'tcpi_snd_bwnd' is not removed to
preserve the ABI. It is always set to 0.

In siftr.c in 'struct pkt_node' the variable 'snd_bwnd' is not removed
to preserve the ABI. It is always set to 0.

These unused variable in the various structures may be reused in the
future or garbage collected before the next release or at some other
point when an ABI change happens anyway for other reasons.

No MFC is planned. The inflight bandwidth limiter stays disabled by
default in the other branches but remains available.

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Improve comment to TCP_MINMSS by taking the wording from lstewart (with
a small difference in the last paragraph though) as suggested by jhb.

Clarify that the 'reviewed by' in r212653 by lstewart wa

Improve comment to TCP_MINMSS by taking the wording from lstewart (with
a small difference in the last paragraph though) as suggested by jhb.

Clarify that the 'reviewed by' in r212653 by lstewart was for the
functional change, not the comments in the committed version.

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Change the default MSS for IPv4 and IPv6 TCP connections from an
artificial power-of-2 rounded number to their real values specified
in RFC879 and RFC2460.

From the history and existing comments it

Change the default MSS for IPv4 and IPv6 TCP connections from an
artificial power-of-2 rounded number to their real values specified
in RFC879 and RFC2460.

From the history and existing comments it appears that the rounded
numbers were intended to be advantageous for the kernel and mbuf
system. However this hasn't been the case at for at least a long
time. The mbuf clusters used in tcp_output() have enough space
to hold the larger real value for the default MSS for both IPv4 and
IPv6. Note that the default MSS is only used when path MTU discovery
is disabled.

Update and expand related comments.

Reviewed by: lsteward (including some word-smithing)
MFC after: 2 weeks

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IFH@204581

use u_char instead of u_int for short bitfields.

For our compiler the two constructs are completely equivalent, but
some compilers (including MSC and tcc) use the base type for alignment,
which in t

use u_char instead of u_int for short bitfields.

For our compiler the two constructs are completely equivalent, but
some compilers (including MSC and tcc) use the base type for alignment,
which in the cases touched here result in aligning the bitfields
to 32 bit instead of the 8 bit that is meant here.

Note that almost all other headers where small bitfields
are used have u_int8_t instead of u_int.

MFC after: 3 days

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Merge from head at r201628.

# This hasn't been tested, and there are at least three bad commits
# that need to be backed out before the branch will be stable again.

MFC 200847:
- Rename the __tcpi_(snd|rcv)_mss fields of the tcp_info structure to remove
the leading underscores since they are now implemented.
- Implement the tcpi_rto and tcpi_last_data_recv fie

MFC 200847:
- Rename the __tcpi_(snd|rcv)_mss fields of the tcp_info structure to remove
the leading underscores since they are now implemented.
- Implement the tcpi_rto and tcpi_last_data_recv fields in the tcp_info
structure.

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- Rename the __tcpi_(snd|rcv)_mss fields of the tcp_info structure to remove
the leading underscores since they are now implemented.
- Implement the tcpi_rto and tcpi_last_data_recv fields in the t

- Rename the __tcpi_(snd|rcv)_mss fields of the tcp_info structure to remove
the leading underscores since they are now implemented.
- Implement the tcpi_rto and tcpi_last_data_recv fields in the tcp_info
structure.

Reviewed by: rwatson
MFC after: 2 weeks

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add rcv_nxt, snd_nxt, and toe offload id to FreeBSD-specific
extension fields for tcp_info

Use #defines for TCP options padding after EOL to be consistent.

Reviewed by: bz