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d76d40126e
freebsd-skq/sys/netinet
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Hans Petter Selasky d76d40126e Update TSO limits to include all headers. 
To make driver programming easier the TSO limits are changed to
reflect the values used in the BUSDMA tag a network adapter driver is
using. The TCP/IP network stack will subtract space for all linklevel
and protocol level headers and ensure that the full mbuf chain passed
to the network adapter fits within the given limits.

Implementation notes:

If a network adapter driver needs to fixup the first mbuf in order to
support VLAN tag insertion, the size of the VLAN tag should be
subtracted from the TSO limit. Else not.

Network adapters which typically inline the complete header mbuf could
technically transmit one more segment. This patch does not implement a
mechanism to recover the last segment for data transmission. It is
believed when sufficiently large mbuf clusters are used, the segment
limit will not be reached and recovering the last segment will not
have any effect.

The current TSO algorithm tries to send MTU-sized packets, where the
MTU typically is 1500 bytes, which gives 1448 bytes of TCP data
payload per packet for IPv4. That means if the TSO length limitiation
is set to 65536 bytes, there will be a data payload remainder of
(65536 - 1500) mod 1448 bytes which is equal to 324 bytes. Trying to
recover total TSO length due to inlining mbuf header data will not
have any effect, because adding or removing the ETH/IP/TCP headers
to or from 324 bytes will not cause more or less TCP payload to be
TSO'ed.

Existing network adapter limits will be updated separately.

Differential Revision:	https://reviews.freebsd.org/D3458
Reviewed by:		rmacklem
MFC after:		2 weeks
2015-09-14 08:36:22 +00:00
..
cc DCTCP (Data Center TCP) implementation. 2015-01-12 08:33:04 +00:00
khelp
libalias mdoc: fix rendering issues 2015-04-26 11:39:25 +00:00
accf_data.c
accf_dns.c In preparation of merging projects/sendfile, transform bare access to 2014-11-12 09:57:15 +00:00
accf_http.c In preparation of merging projects/sendfile, transform bare access to 2014-11-12 09:57:15 +00:00
cc.h DCTCP (Data Center TCP) implementation. 2015-01-12 08:33:04 +00:00
icmp6.h Implement Enhanced DAD algorithm for IPv6 described in 2015-03-02 17:30:26 +00:00
icmp_var.h
if_atm.c
if_atm.h
if_ether.c * Split allocation and table linking for lle's. 2015-08-20 12:05:17 +00:00
if_ether.h Simplify lle lookup/create api by using addresses instead of sockaddrs. 2014-12-08 23:23:53 +00:00
igmp_var.h - Rename 'struct igmp_ifinfo' into 'struct igmp_ifsoftc', since it really 2015-02-19 22:35:23 +00:00
igmp.c Convert in_ifaddr_lock and in6_ifaddr_lock to rmlock. 2015-07-29 08:12:05 +00:00
igmp.h
in_cksum.c
in_debug.c
in_gif.c Eliminate the use of m_copydata() in gif_encapcheck(). 2015-07-29 14:07:43 +00:00
in_kdtrace.c dd DTrace probe points, translators and a corresponding script 2015-09-13 15:50:55 +00:00
in_kdtrace.h dd DTrace probe points, translators and a corresponding script 2015-09-13 15:50:55 +00:00
in_mcast.c Convert in_ifaddr_lock and in6_ifaddr_lock to rmlock. 2015-07-29 08:12:05 +00:00
in_pcb.c Fix a kernel assertion issue introduced with r286227: 2015-08-08 08:40:36 +00:00
in_pcb.h Use Jenkins hash for TCP syncache. 2015-09-05 10:15:19 +00:00
in_pcbgroup.c Refactor / restructure the RSS code into generic, IPv4 and IPv6 specific 2015-01-18 18:06:40 +00:00
in_proto.c Finish r274118: remove useless fields from struct domain. 2014-11-06 14:39:04 +00:00
in_rmx.c Rename rt_foreach_fib() to rt_foreach_fib_walk(). 2015-08-10 20:50:31 +00:00
in_rss.c Rename rss_soft_m2cpuid() -> rss_soft_m2cpuid_v4() in preparation for 2015-08-29 06:58:30 +00:00
in_rss.h Rename rss_soft_m2cpuid() -> rss_soft_m2cpuid_v4() in preparation for 2015-08-29 06:58:30 +00:00
in_systm.h Where appropriate, use the modern terms for the one true time base 2014-12-21 05:07:11 +00:00
in_var.h Convert in_ifaddr_lock and in6_ifaddr_lock to rmlock. 2015-07-29 08:12:05 +00:00
in.c * Split allocation and table linking for lle's. 2015-08-20 12:05:17 +00:00
in.h Provide functions to determine presence of a given address 2015-04-17 11:57:06 +00:00
ip6.h Eliminate use of M_EXT in IP6_EXTHDR_CHECK() by trimming a redundant 2014-10-05 06:28:53 +00:00
ip_carp.c Improve carp(4) locking: 2015-04-21 20:25:12 +00:00
ip_carp.h Merge 'struct ip6protosw' and 'struct protosw' into one. Now we have 2014-08-08 01:57:15 +00:00
ip_divert.c Convert netinet6/ to use new routing API. 2014-11-04 15:39:56 +00:00
ip_divert.h
ip_dummynet.h ECN marking implenetation for dummynet. 2014-06-01 07:28:24 +00:00
ip_ecn.c
ip_ecn.h Remove unneded #include "opt_inet.h". 2015-07-31 09:02:28 +00:00
ip_encap.c Fix possible use after free in encap[46]_input(). 2015-06-18 18:28:38 +00:00
ip_encap.h Merge 'struct ip6protosw' and 'struct protosw' into one. Now we have 2014-08-08 01:57:15 +00:00
ip_fastfwd.c Remove incorrect layering violating code that: 2015-01-12 09:41:12 +00:00
ip_fw.h Make rule table kernel-index rewriting support any kind of objects. 2015-04-27 08:29:39 +00:00
ip_gre.c o Use new function ip_fillid() in all places throughout the kernel, 2015-04-01 22:26:39 +00:00
ip_icmp.c Convert in_ifaddr_lock and in6_ifaddr_lock to rmlock. 2015-07-29 08:12:05 +00:00
ip_icmp.h Where appropriate, use the modern terms for the one true time base 2014-12-21 05:07:11 +00:00
ip_id.c Provide a comment explaining issues with the counter(9) trick, so that 2015-04-02 14:22:59 +00:00
ip_input.c Replace rss_m2cpuid with rss_soft_m2cpuid_v4 for ip_direct_nh.nh_m2cpuid, 2015-09-06 20:20:48 +00:00
ip_ipsec.c Remove now unneded KEY_FREESP() for case when ipsec[46]_process_packet() 2015-04-27 01:11:09 +00:00
ip_ipsec.h Remove flag/flags argument from the following functions: 2014-12-11 18:35:34 +00:00
ip_mroute.c CALLOUT_MPSAFE has lost its meaning since r141428, i.e., for more than ten 2015-05-22 17:05:21 +00:00
ip_mroute.h
ip_options.c Use M_WRITABLE() and M_LEADINGSPACE() rather than checking M_EXT and 2015-01-06 14:32:28 +00:00
ip_options.h Make net.inet.ip.sourceroute, net.inet.ip.accept_sourceroute, and 2014-09-15 07:20:40 +00:00
ip_output.c Simplify ip[6] simploop: 2015-08-08 15:58:35 +00:00
ip_reass.c Fix RSS build - netisr input / NETISR_IP_DIRECT is used here. 2015-04-15 00:57:21 +00:00
ip_var.h fix a typo in a comment 2015-07-18 15:28:32 +00:00
ip.h Since the IETF has redefined the meaning of the tos field to accommodate 2015-07-18 06:48:30 +00:00
pim_var.h Merge 'struct ip6protosw' and 'struct protosw' into one. Now we have 2014-08-08 01:57:15 +00:00
pim.h
raw_ip.c Convert in_ifaddr_lock and in6_ifaddr_lock to rmlock. 2015-07-29 08:12:05 +00:00
sctp_asconf.c Provide consistent error causes whenever an ABORT chunk is sent. 2015-07-27 22:35:54 +00:00
sctp_asconf.h
sctp_auth.c Cleanup the handling of error causes for ERROR chunks. This fixes 2015-09-12 17:08:51 +00:00
sctp_auth.h Use a consistent type for the number of HMAC algorithms. 2014-09-16 14:20:33 +00:00
sctp_bsd_addr.c Minimize the usage of SCTP_BUF_IS_EXTENDED. 2015-01-10 20:49:57 +00:00
sctp_bsd_addr.h
sctp_cc_functions.c Fix and cleanup the debug information. This has no user-visible changes. 2015-05-28 16:00:23 +00:00
sctp_constants.h Ensure that ERROR chunks are always padded by implementing this 2015-09-11 13:54:33 +00:00
sctp_crc32.c
sctp_crc32.h
sctp_dtrace_declare.h
sctp_dtrace_define.h
sctp_header.h Cleanup the handling of error causes for ERROR chunks. This fixes 2015-09-12 17:08:51 +00:00
sctp_indata.c Cleanup the handling of error causes for ERROR chunks. This fixes 2015-09-12 17:08:51 +00:00
sctp_indata.h Don't take the port numbers for packets containing ABORT chunks from 2015-08-02 16:07:30 +00:00
sctp_input.c Fix compilation issue introduced in r287717. 2015-09-12 21:23:24 +00:00
sctp_input.h Add FIB support for SCTP. 2015-06-17 15:20:14 +00:00
sctp_lock_bsd.h
sctp_os_bsd.h Move including netinet/icmp6.h around to avoid a problem when including 2015-07-25 18:26:09 +00:00
sctp_os.h
sctp_output.c Ensure that ERROR chunks are always padded by implementing this 2015-09-11 13:54:33 +00:00
sctp_output.h Fix an issue with MAC OS locking and also optimize the case 2015-07-24 14:09:03 +00:00
sctp_pcb.c Provide consistent error causes whenever an ABORT chunk is sent. 2015-07-27 22:35:54 +00:00
sctp_pcb.h Add FIB support for SCTP. 2015-06-17 15:20:14 +00:00
sctp_peeloff.c Add a SCTP socket option to limit the cwnd for each path. 2015-03-10 19:49:25 +00:00
sctp_peeloff.h
sctp_ss_functions.c
sctp_structs.h Fix several problems with Stream Reset. 2015-07-22 11:30:37 +00:00
sctp_syscalls.c Fix two KTRACE related bugs. 2015-06-19 21:55:12 +00:00
sctp_sysctl.c Fix the exporting of SCTP association states to userland. Without this, 2015-08-29 09:14:32 +00:00
sctp_sysctl.h missed file that should have been included in r287528 2015-09-07 02:00:05 +00:00
sctp_timer.c Allow the path MTU to grow up to the outgoing interface MTU. 2015-08-14 14:26:13 +00:00
sctp_timer.h
sctp_uio.h Export the ssthresh value per SCTP path via the sysctl interface. 2015-07-07 06:34:28 +00:00
sctp_usrreq.c Fix the exporting of SCTP association states to userland. Without this, 2015-08-29 09:14:32 +00:00
sctp_var.h Stop the heartbeat timer when removing a net. 2015-06-14 17:48:44 +00:00
sctp.h Cleanup the handling of error causes for ERROR chunks. This fixes 2015-09-12 17:08:51 +00:00
sctputil.c Add a NULL pointer check to silence the clang code analyzer. 2015-09-04 09:22:16 +00:00
sctputil.h Fix the exporting of SCTP association states to userland. Without this, 2015-08-29 09:14:32 +00:00
siftr.c Move the SIFTR DTrace probe out of the writing thread context 2015-04-30 17:43:40 +00:00
tcp_debug.c
tcp_debug.h
tcp_fsm.h
tcp_hostcache.c CALLOUT_MPSAFE has lost its meaning since r141428, i.e., for more than ten 2015-05-22 17:05:21 +00:00
tcp_hostcache.h Add scope zone id to the in_endpoints and hc_metrics structures. 2014-09-10 16:26:18 +00:00
tcp_input.c dd DTrace probe points, translators and a corresponding script 2015-09-13 15:50:55 +00:00
tcp_lro.c Fix leak in tcp_lro_rx. Simply clearing M_PKTHDR isn't enough, any tags 2015-06-30 17:19:58 +00:00
tcp_lro.h
tcp_offload.c Convert netinet6/ to use new routing API. 2014-11-04 15:39:56 +00:00
tcp_offload.h
tcp_output.c Update TSO limits to include all headers. 2015-09-14 08:36:22 +00:00
tcp_reass.c tcp_reass_zone is not a VNET variable. 2015-08-09 19:07:24 +00:00
tcp_sack.c Remove SYSCTL_VNET_* macros, and simply put CTLFLAG_VNET where needed. 2014-11-07 09:39:05 +00:00
tcp_seq.h
tcp_subr.c dd DTrace probe points, translators and a corresponding script 2015-09-13 15:50:55 +00:00
tcp_syncache.c Use Jenkins hash for TCP syncache. 2015-09-05 10:15:19 +00:00
tcp_syncache.h Use Jenkins hash for TCP syncache. 2015-09-05 10:15:19 +00:00
tcp_timer.c dd DTrace probe points, translators and a corresponding script 2015-09-13 15:50:55 +00:00
tcp_timer.h Put r284245 back in place: If at first this fix was seen as a temporary 2015-08-30 13:44:39 +00:00
tcp_timewait.c Decompose TCP INP_INFO lock to increase short-lived TCP connections scalability: 2015-08-03 12:13:54 +00:00
tcp_usrreq.c dd DTrace probe points, translators and a corresponding script 2015-09-13 15:50:55 +00:00
tcp_var.h Make tcp_mtudisc() static and void. No functional changes. 2015-09-04 12:02:12 +00:00
tcp.h
tcpip.h
toecore.c Do not pass lle to nd6_ns_output(). Use newly-added 2015-09-05 14:14:03 +00:00
toecore.h * Convert TOE framework to use new routing api. 2014-10-25 18:25:00 +00:00
udp_usrreq.c get_inpcbinfo() and get_pcblist() are UDP local functions and 2015-08-27 15:27:41 +00:00
udp_var.h get_inpcbinfo() and get_pcblist() are UDP local functions and 2015-08-27 15:27:41 +00:00
udp.h
udplite.h