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ded5ea6a25
freebsd-skq/sys/net
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Randall Stewart ded5ea6a25 This fixes a out-of-order problem with several 
of the newer drivers. The basic problem was
that the driver was pulling the mbuf off the
drbr ring and then when sending with xmit(), encounting
a full transmit ring. Thus the lower layer
xmit() function would return an error, and the
drivers would then append the data back on to the ring.
For TCP this is a horrible scenario sure to bring
on a fast-retransmit.

The fix is to use drbr_peek() to pull the data pointer
but not remove it from the ring. If it fails then
we either call the new drbr_putback or drbr_advance
method. Advance moves it forward (we do this sometimes
when the xmit() function frees the mbuf). When
we succeed we always call advance. The
putback will always copy the mbuf back to the top
of the ring. Note that the putback *cannot* be used
with a drbr_dequeue() only with drbr_peek(). We most
of the time, in putback, would not need to copy it
back since most likey the mbuf is still the same, but
sometimes xmit() functions will change the mbuf via
a pullup or other call. So the optimial case for
the single consumer is to always copy it back. If
we ever do a multiple_consumer (for lagg?) we
will  need a test and atomic in the put back possibly
a seperate putback_mc() in the ring buf.

Reviewed by:	jhb@freebsd.org, jlv@freebsd.org
2013-02-07 15:20:54 +00:00
..
bpf_buffer.c Changes to resolve races in bpfread() and catchpacket() that, at worst, 2012-12-10 16:14:44 +00:00
bpf_buffer.h Call bpf_jitter() before acquiring BPF global lock due to malloc() being used inside bpf_jitter. 2012-05-21 22:19:19 +00:00
bpf_filter.c Clear the filter memory area before using it. Leaving it uninitialized may 2011-07-14 21:06:22 +00:00
bpf_jitter.c
bpf_jitter.h
bpf_zerocopy.c After the PHYS_TO_VM_PAGE() function was de-inlined, the main reason 2012-08-05 14:11:42 +00:00
bpf_zerocopy.h - Fix trivial typo 2012-01-14 17:07:52 +00:00
bpf.c - Utilize m_get2(), accidentially fixing some signedness bugs. 2013-01-24 14:29:31 +00:00
bpf.h Changes to resolve races in bpfread() and catchpacket() that, at worst, 2012-12-10 16:14:44 +00:00
bpfdesc.h Changes to resolve races in bpfread() and catchpacket() that, at worst, 2012-12-10 16:14:44 +00:00
bridgestp.c Mechanically substitute flags from historic mbuf allocator with 2012-12-05 08:04:20 +00:00
bridgestp.h Move the interface media check to a taskqueue, some interfaces (usb) sleep 2012-04-20 10:06:28 +00:00
ethernet.h
fddi.h
firewire.h
flowtable.c - Move jenkins.h to jenkins_hash.c 2012-09-04 12:07:33 +00:00
flowtable.h
ieee8023ad_lacp.c Mechanically substitute flags from historic mbuf allocator with 2012-12-05 08:04:20 +00:00
ieee8023ad_lacp.h
if_arc.h
if_arcsubr.c Mechanically substitute flags from historic mbuf allocator with 2012-12-05 08:04:20 +00:00
if_arp.h
if_atm.h
if_atmsubr.c Mechanically substitute flags from historic mbuf allocator with 2012-12-05 08:04:20 +00:00
if_bridge.c Fix typo in comment. 2012-12-18 06:37:23 +00:00
if_bridgevar.h
if_clone.c Fix VIMAGE build. 2012-10-17 21:19:27 +00:00
if_clone.h Make the "struct if_clone" opaque to users of the cloning API. Users 2012-10-16 13:37:54 +00:00
if_dead.c
if_debug.c Add infrastructure to allow all frames/packets received on an interface 2011-07-03 12:22:02 +00:00
if_disc.c Make the "struct if_clone" opaque to users of the cloning API. Users 2012-10-16 13:37:54 +00:00
if_dl.h Use the LLINDEX macro to access the link-level I/F index. This makes 2012-05-19 02:39:43 +00:00
if_edsc.c Make the "struct if_clone" opaque to users of the cloning API. Users 2012-10-16 13:37:54 +00:00
if_ef.c Mechanically substitute flags from historic mbuf allocator with 2012-12-05 08:04:20 +00:00
if_enc.c Make the "struct if_clone" opaque to users of the cloning API. Users 2012-10-16 13:37:54 +00:00
if_enc.h
if_epair.c Utilize new macro to initialize if_baudrate(). 2012-10-18 09:57:56 +00:00
if_ethersubr.c Mechanically substitute flags from historic mbuf allocator with 2012-12-05 08:04:20 +00:00
if_faith.c Make the "struct if_clone" opaque to users of the cloning API. Users 2012-10-16 13:37:54 +00:00
if_fddisubr.c Mechanically substitute flags from historic mbuf allocator with 2012-12-05 08:04:20 +00:00
if_fwsubr.c Mechanically substitute flags from historic mbuf allocator with 2012-12-05 08:04:20 +00:00
if_gif.c Make the "struct if_clone" opaque to users of the cloning API. Users 2012-10-16 13:37:54 +00:00
if_gif.h
if_gre.c Mechanically substitute flags from historic mbuf allocator with 2012-12-05 08:04:20 +00:00
if_gre.h gre(4) was using a field in the softc to detect possible recursion. 2011-06-18 09:34:03 +00:00
if_iso88025subr.c Mechanically substitute flags from historic mbuf allocator with 2012-12-05 08:04:20 +00:00
if_lagg.c If lagg(4) can't forward a packet due to underlying port problems, 2013-01-21 08:59:31 +00:00
if_lagg.h Add the ability to set which packet layers are used for the load balance hash 2012-03-06 22:58:13 +00:00
if_llatbl.c Retire struct sockaddr_inarp. 2013-01-31 08:55:21 +00:00
if_llatbl.h Retire struct sockaddr_inarp. 2013-01-31 08:55:21 +00:00
if_llc.h
if_loop.c Make the "struct if_clone" opaque to users of the cloning API. Users 2012-10-16 13:37:54 +00:00
if_media.c
if_media.h Add media types for 40G media that might be used with FreeBSD. 2012-04-10 13:59:35 +00:00
if_mib.c Mark all SYSCTL_NODEs static that have no corresponding SYSCTL_DECLs. 2011-11-07 15:43:11 +00:00
if_mib.h
if_pflog.h o Create directory sys/netpfil, where all packet filters should 2012-09-14 11:51:49 +00:00
if_pfsync.h - Add dashes before copyright notices. 2013-01-07 19:36:11 +00:00
if_sppp.h
if_spppfr.c Mechanically substitute flags from historic mbuf allocator with 2012-12-05 08:04:20 +00:00
if_spppsubr.c Mechanically substitute flags from historic mbuf allocator with 2012-12-05 08:04:20 +00:00
if_stf.c Add an ability to set net.link.stf.permit_rfc1918 from the loader. 2012-12-27 21:26:08 +00:00
if_stf.h
if_tap.c Mechanically substitute flags from historic mbuf allocator with 2012-12-05 08:04:20 +00:00
if_tap.h
if_tapvar.h Revert part of an earlier patch attempt that snuck in with r240938. 2012-09-25 23:41:45 +00:00
if_tun.c Mechanically substitute flags from historic mbuf allocator with 2012-12-05 08:04:20 +00:00
if_tun.h
if_types.h A major overhaul of the CARP implementation. The ip_carp.c was started 2011-12-16 12:16:56 +00:00
if_var.h This fixes a out-of-order problem with several 2013-02-07 15:20:54 +00:00
if_vlan_var.h Clarify throughout the vlan(4) code the difference between a "tag" (the 2012-01-12 18:39:37 +00:00
if_vlan.c Remove unused and unnecessary CSUM_IP_FRAGS checksumming capability. 2012-11-27 19:31:49 +00:00
if.c Update to previous r241688 to use __func__ instead of spelled out function 2012-10-19 10:07:55 +00:00
if.h provide helper if_initbaudrate() to set if_baudrate_pf and if_baudrate_pf. 2012-10-17 19:24:13 +00:00
iso88025.h
netisr_internal.h Rework netisr policy mechanism so that per-protocol dispatch policies can 2011-05-24 12:34:19 +00:00
netisr.c Mark all SYSCTL_NODEs static that have no corresponding SYSCTL_DECLs. 2011-11-07 15:43:11 +00:00
netisr.h Rework netisr policy mechanism so that per-protocol dispatch policies can 2011-05-24 12:34:19 +00:00
netmap_user.h Cast through void * to silence compiler warning 2012-10-03 21:41:20 +00:00
netmap.h leftover from r245579... flags for semi transparent mode and direct 2013-01-23 03:49:48 +00:00
pf_mtag.h o Create directory sys/netpfil, where all packet filters should 2012-09-14 11:51:49 +00:00
pfil.c Remove the recently added sysctl variable net.pfil.forward. 2012-11-02 01:20:55 +00:00
pfil.h Remove the recently added sysctl variable net.pfil.forward. 2012-11-02 01:20:55 +00:00
pfkeyv2.h
pfvar.h Utilize Jenkins hash with random seed for source nodes storage. 2012-09-20 06:52:05 +00:00
ppp_defs.h
radix_mpath.c When the RADIX_MPATH kernel option is enabled, the RADIX_MPATH code tries 2011-08-25 04:31:20 +00:00
radix_mpath.h
radix.c
radix.h Make KBI changes required for future MFCing of inpcb rtentry / llentry caching. 2011-09-20 20:27:26 +00:00
raw_cb.c Mark all SYSCTL_NODEs static that have no corresponding SYSCTL_DECLs. 2011-11-07 15:43:11 +00:00
raw_cb.h Pass the fibnum where we need filtering of the message on the 2011-09-28 13:48:36 +00:00
raw_usrreq.c Pass the fibnum where we need filtering of the message on the 2011-09-28 13:48:36 +00:00
route.c Hide kernel option ROUTETABLES evaluations in the implementation 2012-03-18 11:23:40 +00:00
route.h When ip_output()/ip6_output() is supplied a struct route *ro argument, 2012-07-04 07:37:53 +00:00
rtsock.c - Move definition of V_deembed_scopeid to scope6_var.h. 2012-12-05 19:45:24 +00:00
slcompress.c
slcompress.h
vnet.c Mark MALLOC_DEFINEs static that have no corresponding MALLOC_DECLAREs. 2011-11-07 06:44:47 +00:00
vnet.h
zlib.c Juggle some internal symbols from our antique zlib (that originally came 2013-01-06 14:59:59 +00:00
zlib.h Juggle some internal symbols from our antique zlib (that originally came 2013-01-06 14:59:59 +00:00
zutil.h