d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
9acc0eafd7
freebsd-skq/sys/net
History
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
..
altq Fix the spelling of eri's name. 2015-08-24 23:40:36 +00:00
bpf_buffer.c Remove the sleep from the buffer allocation routine. 2015-07-31 20:25:54 +00:00
bpf_buffer.h
bpf_filter.c
bpf_jitter.c
bpf_jitter.h
bpf_zerocopy.c
bpf_zerocopy.h
bpf.c Remove the mtx_sleep() from the kqueue f_event filter. 2015-08-03 22:14:45 +00:00
bpf.h Remove two unnecessary sleeps from the hot path in bpf(4). 2015-07-31 21:43:27 +00:00
bpfdesc.h
bridgestp.c
bridgestp.h
ethernet.h Sync to HEAD@r274766 2014-11-21 01:22:33 +00:00
fddi.h
firewire.h
flowtable.c Start process of removing the use of the deprecated "M_FLOWID" flag 2014-12-01 11:45:24 +00:00
flowtable.h
ieee8023ad_lacp.c Make LAG LACP fast timeout tunable through IOCTL. 2015-08-12 20:21:04 +00:00
ieee8023ad_lacp.h Make LAG LACP fast timeout tunable through IOCTL. 2015-08-12 20:21:04 +00:00
ieee_oui.h
if_arc.h Replace 'struct route *' if_output() argument with 'struct nhop_info *'. 2014-11-09 16:33:04 +00:00
if_arcsubr.c Fix typo. 2015-01-09 20:29:13 +00:00
if_arp.h Remove struct arpcom. It is unused by most interface types, that allocate 2014-11-07 15:14:10 +00:00
if_atm.h Replace 'struct route *' if_output() argument with 'struct nhop_info *'. 2014-11-09 16:33:04 +00:00
if_atmsubr.c Replace 'struct route *' if_output() argument with 'struct nhop_info *'. 2014-11-09 16:33:04 +00:00
if_bridge.c Fix panic when adding vtnet interfaces to a bridge 2015-06-13 19:39:21 +00:00
if_bridgevar.h
if_clone.c Fix group membership of cloned interfaces when one is moved by 2015-03-02 20:00:03 +00:00
if_clone.h Fix group membership of cloned interfaces when one is moved by 2015-03-02 20:00:03 +00:00
if_dead.c Provide a dead version of if_get_counter. 2014-12-12 16:10:42 +00:00
if_debug.c Remove ifq_drops from struct ifqueue. Now queue drops are accounted in 2014-09-19 09:01:19 +00:00
if_disc.c Remove net/route_internal header from if_disc and if_faith. 2014-11-09 16:58:36 +00:00
if_dl.h Constantify lookup key in ifa_ifwith* functions. 2015-09-05 05:33:20 +00:00
if_edsc.c Virtualize if_edsc(4). 2014-10-05 21:27:26 +00:00
if_enc.c Replace 'struct route *' if_output() argument with 'struct nhop_info *'. 2014-11-09 16:33:04 +00:00
if_enc.h
if_epair.c Fix a panic which was reproducible by an infinite loop of 2015-09-02 16:30:45 +00:00
if_ethersubr.c Huge cleanup of random(4) code. 2015-06-30 17:00:45 +00:00
if_fddisubr.c After r275196 unbreak NOIP and NOINET kernels by hiding an otherwise 2014-11-28 14:51:49 +00:00
if_fwsubr.c After r275196 unbreak NOIP and NOINET kernels by hiding an otherwise 2014-11-28 14:51:49 +00:00
if_gif.c - Remove GIF_{SEND,ACCEPT}_REVETHIP. 2015-09-10 05:59:39 +00:00
if_gif.h - Remove GIF_{SEND,ACCEPT}_REVETHIP. 2015-09-10 05:59:39 +00:00
if_gre.c Add new socket ioctls SIOC[SG]TUNFIB to set FIB number of encapsulated 2015-05-12 07:37:27 +00:00
if_gre.h Extern declarations in C files loses compile-time checking that 2014-12-25 21:32:37 +00:00
if_iso88025subr.c Do not return unlocked/unreferenced lle in arpresolve/nd6_storelladdr - 2014-11-27 23:06:25 +00:00
if_lagg.c Make LAG LACP fast timeout tunable through IOCTL. 2015-08-12 20:21:04 +00:00
if_lagg.h Make LAG LACP fast timeout tunable through IOCTL. 2015-08-12 20:21:04 +00:00
if_llatbl.c Simplify lla_rt_output()/nd6_add_ifa_lle() by setting lle state in 2015-08-31 05:03:36 +00:00
if_llatbl.h * Split allocation and table linking for lle's. 2015-08-20 12:05:17 +00:00
if_llc.h
if_loop.c Fix if_loop so bpfwrite() can use it regardless of the state of 2015-07-06 02:12:49 +00:00
if_me.c Add new socket ioctls SIOC[SG]TUNFIB to set FIB number of encapsulated 2015-05-12 07:37:27 +00:00
if_media.c Make IFMEDIA_DEBUG a kernel option. 2015-04-21 10:35:23 +00:00
if_media.h ifmedia changes: 2015-04-07 21:31:17 +00:00
if_mib.c Remove SYSCTL_VNET_* macros, and simply put CTLFLAG_VNET where needed. 2014-11-07 09:39:05 +00:00
if_mib.h
if_pflog.h
if_pfsync.h
if_sppp.h
if_spppfr.c Mechanically convert to if_inc_counter(). 2014-09-19 10:39:58 +00:00
if_spppsubr.c Convert in_ifaddr_lock and in6_ifaddr_lock to rmlock. 2015-07-29 08:12:05 +00:00
if_stf.c Ansify if_stf.c 2015-07-31 09:04:22 +00:00
if_tap.c Redo r274966. Instead of global all-interface all-vnet undocumented sysctl, 2015-04-10 09:50:13 +00:00
if_tap.h
if_tapvar.h
if_tun.c * Address review (and add a bit myself). 2015-07-12 18:14:38 +00:00
if_tun.h
if_types.h After r281643 an #ifdef IFT_FOO preprocessor directive returns false, 2015-05-02 20:37:40 +00:00
if_var.h Update TSO limits to include all headers. 2015-09-14 08:36:22 +00:00
if_vlan_var.h Move struct ether_vlan_header to ethernet.h, out of if_vlan_var.h, 2014-11-11 10:22:33 +00:00
if_vlan.c Don't propagate SIOCSIFCAPS from a vlan(4) to its parent. This leads to 2015-04-23 13:19:00 +00:00
if_vxlan.c Start process of removing the use of the deprecated "M_FLOWID" flag 2014-12-01 11:45:24 +00:00
if_vxlan.h Add vxlan interface 2014-10-20 14:42:42 +00:00
if.c Constantify lookup key in ifa_ifwith* functions. 2015-09-05 05:33:20 +00:00
if.h
ifq.h Move ALTQ from contrib to net/altq. The ALTQ code is for many years 2015-04-16 20:22:40 +00:00
iso88025.h Replace 'struct route *' if_output() argument with 'struct nhop_info *'. 2014-11-09 16:33:04 +00:00
netisr_internal.h
netisr.c Currently there is no easy way to specify net.isr.maxthreads = all cpus. We need 2015-04-25 16:12:06 +00:00
netisr.h
netmap_user.h Sync netmap sources with the version in our private tree. 2015-07-10 05:51:36 +00:00
netmap.h Sync netmap sources with the version in our private tree. 2015-07-10 05:51:36 +00:00
paravirt.h
pfil.c
pfil.h
pfkeyv2.h looks like all archs either have clang or cdefs included before.. 2015-08-02 21:33:40 +00:00
pfvar.h pf: Remove support for 'scrub fragment crop|drop-ovl' 2015-08-27 21:27:47 +00:00
ppp_defs.h
radix_mpath.c Replace 'struct route *' if_output() argument with 'struct nhop_info *'. 2014-11-09 16:33:04 +00:00
radix_mpath.h
radix.c Follow r256586 and rename the kernel version of the Free() macro to 2015-07-30 02:09:03 +00:00
radix.h Follow r256586 and rename the kernel version of the Free() macro to 2015-07-30 02:09:03 +00:00
raw_cb.c
raw_cb.h
raw_usrreq.c
route.c Constantify lookup key in ifa_ifwith* functions. 2015-09-05 05:33:20 +00:00
route.h Constantify lookup key in ifa_ifwith* functions. 2015-09-05 05:33:20 +00:00
rss_config.c Remove now unused (and #if 0'ed out) headers. 2015-08-29 04:33:31 +00:00
rss_config.h Replace the printf()s with optional rate limited debugging for RSS. 2015-08-28 05:58:16 +00:00
rtsock.c Switch route radix to dual-lock model: 2014-11-10 00:07:06 +00:00
sff8436.h * Update SFF-8024 Identifier constants. 2015-05-16 13:11:35 +00:00
sff8472.h * Update SFF-8024 Identifier constants. 2015-05-16 13:11:35 +00:00
slcompress.c
slcompress.h
toeplitz.c Refactor / restructure the RSS code into generic, IPv4 and IPv6 specific 2015-01-18 18:06:40 +00:00
toeplitz.h Refactor / restructure the RSS code into generic, IPv4 and IPv6 specific 2015-01-18 18:06:40 +00:00
vnet.c
vnet.h Remove SYSCTL_VNET_* macros, and simply put CTLFLAG_VNET where needed. 2014-11-07 09:39:05 +00:00