Eric Lee / smarc-fsl-linux-kernel

01 Oct, 2009

1 commit

  • b7058842c   net: Make setsockopt() optlen be unsigned. ... Browse Code »

    This provides safety against negative optlen at the type
    level instead of depending upon (sometimes non-trivial)
    checks against this sprinkled all over the the place, in
    each and every implementation.

    Based upon work done by Arjan van de Ven and feedback
    from Linus Torvalds.

    Signed-off-by: David S. Miller

    David S. Miller
     

29 Oct, 2008

1 commit

  • 645ca708f   udp: introduce struct udp_table and multiple spinlocks ... Browse Code »

    UDP sockets are hashed in a 128 slots hash table.

    This hash table is protected by *one* rwlock.

    This rwlock is readlocked each time an incoming UDP message is handled.

    This rwlock is writelocked each time a socket must be inserted in
    hash table (bind time), or deleted from this table (close time)

    This is not scalable on SMP machines :

    1) Even in read mode, lock() and unlock() are atomic operations and
    must dirty a contended cache line, shared by all cpus.

    2) A writer might be starved if many readers are 'in flight'. This can
    happen on a machine with some NIC receiving many UDP messages. User
    process can be delayed a long time at socket creation/dismantle time.

    This patch prepares RCU migration, by introducing 'struct udp_table
    and struct udp_hslot', and using one spinlock per chain, to reduce
    contention on central rwlock.

    Introducing one spinlock per chain reduces latencies, for port
    randomization on heavily loaded UDP servers. This also speedup
    bindings to specific ports.

    udp_lib_unhash() was uninlined, becoming to big.

    Some cleanups were done to ease review of following patch
    (RCUification of UDP Unicast lookups)

    Signed-off-by: Eric Dumazet
    Signed-off-by: David S. Miller

    Eric Dumazet
     

15 Jun, 2008

1 commit

23 Mar, 2008

1 commit

  • 6ba5a3c52   [UDP]: Make full use of proto.h.udp_hash innovation. ... Browse Code »

    After this we have only udp_lib_get_port to get the port and two
    stubs for ipv4 and ipv6. No difference in udp and udplite except
    for initialized h.udp_hash member.

    I tried to find a graceful way to drop the only difference between
    udp_v4_get_port and udp_v6_get_port (i.e. the rcv_saddr comparison
    routine), but adding one more callback on the struct proto didn't
    appear such :( Maybe later.

    Signed-off-by: Pavel Emelyanov
    Signed-off-by: David S. Miller

    Pavel Emelyanov
     

11 Oct, 2007

1 commit

08 Jun, 2007

1 commit

  • df2bc459a   [UDP]: Revert 2-pass hashing changes. ... Browse Code »

    This reverts changesets:

    6aaf47fa48d3c44280810b1b470261d340e4ed87
    b7b5f487ab39bc10ed0694af35651a03d9cb97ff
    de34ed91c4ffa4727964a832c46e624dd1495cf5
    fc038410b4b1643766f8033f4940bcdb1dace633

    There are still some correctness issues recently
    discovered which do not have a known fix that doesn't
    involve doing a full hash table scan on port bind.

    So revert for now.

    Signed-off-by: David S. Miller

    David S. Miller
     

11 May, 2007

1 commit

11 Feb, 2007

1 commit

03 Dec, 2006

1 commit

  • ba4e58eca   [NET]: Supporting UDP-Lite (RFC 3828) in Linux ... Browse Code »

    This is a revision of the previously submitted patch, which alters
    the way files are organized and compiled in the following manner:

    * UDP and UDP-Lite now use separate object files
    * source file dependencies resolved via header files
    net/ipv{4,6}/udp_impl.h
    * order of inclusion files in udp.c/udplite.c adapted
    accordingly

    [NET/IPv4]: Support for the UDP-Lite protocol (RFC 3828)

    This patch adds support for UDP-Lite to the IPv4 stack, provided as an
    extension to the existing UDPv4 code:
    * generic routines are all located in net/ipv4/udp.c
    * UDP-Lite specific routines are in net/ipv4/udplite.c
    * MIB/statistics support in /proc/net/snmp and /proc/net/udplite
    * shared API with extensions for partial checksum coverage

    [NET/IPv6]: Extension for UDP-Lite over IPv6

    It extends the existing UDPv6 code base with support for UDP-Lite
    in the same manner as per UDPv4. In particular,
    * UDPv6 generic and shared code is in net/ipv6/udp.c
    * UDP-Litev6 specific extensions are in net/ipv6/udplite.c
    * MIB/statistics support in /proc/net/snmp6 and /proc/net/udplite6
    * support for IPV6_ADDRFORM
    * aligned the coding style of protocol initialisation with af_inet6.c
    * made the error handling in udpv6_queue_rcv_skb consistent;
    to return `-1' on error on all error cases
    * consolidation of shared code

    [NET]: UDP-Lite Documentation and basic XFRM/Netfilter support

    The UDP-Lite patch further provides
    * API documentation for UDP-Lite
    * basic xfrm support
    * basic netfilter support for IPv4 and IPv6 (LOG target)

    Signed-off-by: Gerrit Renker
    Signed-off-by: David S. Miller

    Gerrit Renker