1. 17 Jan, 2014 15 commits
    • Florian Fainelli's avatar
      r6040: use ETH_ZLEN instead of MISR for SKB length checking · 31cf344c
      Florian Fainelli authored
      Ever since this driver was merged the following code was included:
      
      if (skb->len < MISR)
      	skb->len = MISR;
      
      MISR is defined to 0x3C which is also equivalent to ETH_ZLEN, but use
      ETH_ZLEN directly which is exactly what we want to be checking for.
      Reported-by: default avatarMarc Volovic <marcv@ezchip.com>
      Signed-off-by: default avatarFlorian Fainelli <florian@openwrt.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      31cf344c
    • Florian Fainelli's avatar
      r6040: add delays in MDIO read/write polling loops · 4f8d9f3c
      Florian Fainelli authored
      On newer and faster machines (Vortex X86DX) using the r6040 driver, it
      was noticed that the driver was returning an error during probing traced
      down to being the MDIO bus probing and the inability to complete a MDIO
      read operation in time. It turns out that the MDIO operations on these
      faster machines usually complete after ~2140 iterations which is bigger
      than 2048 (MAC_DEF_TIMEOUT) and results in spurious timeouts depending
      on the system load.
      
      Update r6040_phy_read() and r6040_phy_write() to include a 1
      micro second delay in each busy-looping iteration of the loop which is a
      much safer operation than incrementing MAC_DEF_TIMEOUT.
      Reported-by: default avatarNils Koehler <nils.koehler@ibt-interfaces.de>
      Reported-by: default avatarDaniel Goertzen <daniel.goertzen@gmail.com>
      Signed-off-by: default avatarFlorian Fainelli <florian@openwrt.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      4f8d9f3c
    • Paul Durrant's avatar
      xen-netfront: add support for IPv6 offloads · 2c0057de
      Paul Durrant authored
      This patch adds support for IPv6 checksum offload and GSO when those
      features are available in the backend.
      Signed-off-by: default avatarPaul Durrant <paul.durrant@citrix.com>
      Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
      Cc: David Vrabel <david.vrabel@citrix.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      2c0057de
    • Tom Herbert's avatar
      net: Check skb->rxhash in gro_receive · 0b4cec8c
      Tom Herbert authored
      When initializing a gro_list for a packet, first check the rxhash of
      the incoming skb against that of the skb's in the list. This should be
      a very strong inidicator of whether the flow is going to be matched,
      and potentially allows a lot of other checks to be short circuited.
      Use skb_hash_raw so that we don't force the hash to be calculated.
      
      Tested by running netperf 200 TCP_STREAMs between two machines with
      GRO, HW rxhash, and 1G. Saw no performance degration, slight reduction
      of time in dev_gro_receive.
      Signed-off-by: default avatarTom Herbert <therbert@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0b4cec8c
    • Tom Herbert's avatar
      net: Add skb_get_hash_raw · 57bdf7f4
      Tom Herbert authored
      Function to just return skb->rxhash without checking to see if it needs
      to be recomputed.
      Signed-off-by: default avatarTom Herbert <therbert@google.com>
      Acked-by: default avatarEric Dumazet <edumazet@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      57bdf7f4
    • stephen hemminger's avatar
      vxge: make local functions static · e40c10fc
      stephen hemminger authored
      Remove unused function vxge_hw_vpath_vid_get
      Signed-off-by: default avatarStephen Hemminger <stephen@networkplumber.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e40c10fc
    • stephen hemminger's avatar
      bnad: code cleanup · 2fd888a5
      stephen hemminger authored
      Use 'make namespacecheck' to code that could be declared static.
      After that remove code that is not being used.
      
      Compile tested only.
      Signed-off-by: default avatarStephen Hemminger <stephen@networkplumber.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      2fd888a5
    • Barry Song's avatar
      dm9000: fix a lot of checkpatch issues · 5b22721d
      Barry Song authored
      recently, dm9000 codes have many checkpatch errors and warnings:
      
      WARNING: please, no space before tabs
      3: FILE: dm9000.c:3:
      + * ^ICopyright (C) 1997  Sten Wang$
      
      WARNING: please, no space before tabs
      5: FILE: dm9000.c:5:
      + * ^IThis program is free software; you can redistribute it and/or$
      
      WARNING: please, no space before tabs
      6: FILE: dm9000.c:6:
      + * ^Imodify it under the terms of the GNU General Public License$
      
      WARNING: please, no space before tabs
      7: FILE: dm9000.c:7:
      + * ^Ias published by the Free Software Foundation; either version 2$
      
      WARNING: please, no space before tabs
      8: FILE: dm9000.c:8:
      + * ^Iof the License, or (at your option) any later version.$
      
      WARNING: please, no space before tabs
      10: FILE: dm9000.c:10:
      + * ^IThis program is distributed in the hope that it will be useful,$
      
      WARNING: please, no space before tabs
      11: FILE: dm9000.c:11:
      + * ^Ibut WITHOUT ANY WARRANTY; without even the implied warranty of$
      
      WARNING: please, no space before tabs
      12: FILE: dm9000.c:12:
      + * ^IMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the$
      
      WARNING: please, no space before tabs
      13: FILE: dm9000.c:13:
      + * ^IGNU General Public License for more details.$
      
      WARNING: do not add new typedefs
      97: FILE: dm9000.c:97:
      +typedef struct board_info {
      
      ERROR: spaces prohibited around that ':' (ctx:WxV)
      113: FILE: dm9000.c:113:
      +	unsigned int	in_suspend :1;
       	            	           ^
      
      ERROR: spaces prohibited around that ':' (ctx:WxV)
      114: FILE: dm9000.c:114:
      +	unsigned int	wake_supported :1;
       	            	               ^
      
      This patch fixes important errors in it.
      Signed-off-by: default avatarBarry Song <Baohua.Song@csr.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      5b22721d
    • Daniel Borkmann's avatar
      packet: use percpu mmap tx frame pending refcount · b0138408
      Daniel Borkmann authored
      In PF_PACKET's packet mmap(), we can avoid using one atomic_inc()
      and one atomic_dec() call in skb destructor and use a percpu
      reference count instead in order to determine if packets are
      still pending to be sent out. Micro-benchmark with [1] that has
      been slightly modified (that is, protcol = 0 in socket(2) and
      bind(2)), example on a rather crappy testing machine; I expect
      it to scale and have even better results on bigger machines:
      
      ./packet_mm_tx -s7000 -m7200 -z700000 em1, avg over 2500 runs:
      
      With patch:    4,022,015 cyc
      Without patch: 4,812,994 cyc
      
      time ./packet_mm_tx -s64 -c10000000 em1 > /dev/null, stable:
      
      With patch:
        real         1m32.241s
        user         0m0.287s
        sys          1m29.316s
      
      Without patch:
        real         1m38.386s
        user         0m0.265s
        sys          1m35.572s
      
      In function tpacket_snd(), it is okay to use packet_read_pending()
      since in fast-path we short-circuit the condition already with
      ph != NULL, since we have next frames to process. In case we have
      MSG_DONTWAIT, we also do not execute this path as need_wait is
      false here anyway, and in case of _no_ MSG_DONTWAIT flag, it is
      okay to call a packet_read_pending(), because when we ever reach
      that path, we're done processing outgoing frames anyway and only
      look if there are skbs still outstanding to be orphaned. We can
      stay lockless in this percpu counter since it's acceptable when we
      reach this path for the sum to be imprecise first, but we'll level
      out at 0 after all pending frames have reached the skb destructor
      eventually through tx reclaim. When people pin a tx process to
      particular CPUs, we expect overflows to happen in the reference
      counter as on one CPU we expect heavy increase; and distributed
      through ksoftirqd on all CPUs a decrease, for example. As
      David Laight points out, since the C language doesn't define the
      result of signed int overflow (i.e. rather than wrap, it is
      allowed to saturate as a possible outcome), we have to use
      unsigned int as reference count. The sum over all CPUs when tx
      is complete will result in 0 again.
      
      The BUG_ON() in tpacket_destruct_skb() we can remove as well. It
      can _only_ be set from inside tpacket_snd() path and we made sure
      to increase tx_ring.pending in any case before we called po->xmit(skb).
      So testing for tx_ring.pending == 0 is not too useful. Instead, it
      would rather have been useful to test if lower layers didn't orphan
      the skb so that we're missing ring slots being put back to
      TP_STATUS_AVAILABLE. But such a bug will be caught in user space
      already as we end up realizing that we do not have any
      TP_STATUS_AVAILABLE slots left anymore. Therefore, we're all set.
      
      Btw, in case of RX_RING path, we do not make use of the pending
      member, therefore we also don't need to use up any percpu memory
      here. Also note that __alloc_percpu() already returns a zero-filled
      percpu area, so initialization is done already.
      
        [1] http://wiki.ipxwarzone.com/index.php5?title=Linux_packet_mmapSigned-off-by: default avatarDaniel Borkmann <dborkman@redhat.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      b0138408
    • Daniel Borkmann's avatar
      packet: don't unconditionally schedule() in case of MSG_DONTWAIT · 87a2fd28
      Daniel Borkmann authored
      In tpacket_snd(), when we've discovered a first frame that is
      not in status TP_STATUS_SEND_REQUEST, and return a NULL buffer,
      we exit the send routine in case of MSG_DONTWAIT, since we've
      finished traversing the mmaped send ring buffer and don't care
      about pending frames.
      
      While doing so, we still unconditionally call an expensive
      schedule() in the packet_current_frame() "error" path, which
      is unnecessary in this case since it's enough to just quit
      the function.
      
      Also, in case MSG_DONTWAIT is not set, we should rather test
      for need_resched() first and do schedule() only if necessary
      since meanwhile pending frames could already have finished
      processing and called skb destructor.
      Signed-off-by: default avatarDaniel Borkmann <dborkman@redhat.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      87a2fd28
    • Daniel Borkmann's avatar
      packet: improve socket create/bind latency in some cases · 902fefb8
      Daniel Borkmann authored
      Most people acquire PF_PACKET sockets with a protocol argument in
      the socket call, e.g. libpcap does so with htons(ETH_P_ALL) for
      all its sockets. Most likely, at some point in time a subsequent
      bind() call will follow, e.g. in libpcap with ...
      
        memset(&sll, 0, sizeof(sll));
        sll.sll_family          = AF_PACKET;
        sll.sll_ifindex         = ifindex;
        sll.sll_protocol        = htons(ETH_P_ALL);
      
      ... as arguments. What happens in the kernel is that already
      in socket() syscall, we install a proto hook via register_prot_hook()
      if our protocol argument is != 0. Yet, in bind() we're almost
      doing the same work by doing a unregister_prot_hook() with an
      expensive synchronize_net() call in case during socket() the proto
      was != 0, plus follow-up register_prot_hook() with a bound device
      to it this time, in order to limit traffic we get.
      
      In the case when the protocol and user supplied device index (== 0)
      does not change from socket() to bind(), we can spare us doing
      the same work twice. Similarly for re-binding to the same device
      and protocol. For these scenarios, we can decrease create/bind
      latency from ~7447us (sock-bind-2 case) to ~89us (sock-bind-1 case)
      with this patch.
      
      Alternatively, for the first case, if people care, they should
      simply create their sockets with proto == 0 argument and define
      the protocol during bind() as this saves a call to synchronize_net()
      as well (sock-bind-3 case).
      
      In all other cases, we're tied to user space behaviour we must not
      change, also since a bind() is not strictly required. Thus, we need
      the synchronize_net() to make sure no asynchronous packet processing
      paths still refer to the previous elements of po->prot_hook.
      
      In case of mmap()ed sockets, the workflow that includes bind() is
      socket() -> setsockopt(<ring>) -> bind(). In that case, a pair of
      {__unregister, register}_prot_hook is being called from setsockopt()
      in order to install the new protocol receive handler. Thus, when
      we call bind and can skip a re-hook, we have already previously
      installed the new handler. For fanout, this is handled different
      entirely, so we should be good.
      
      Timings on an i7-3520M machine:
      
        * sock-bind-1:   89 us
        * sock-bind-2: 7447 us
        * sock-bind-3:   75 us
      
      sock-bind-1:
        socket(PF_PACKET, SOCK_RAW, htons(ETH_P_IP)) = 3
        bind(3, {sa_family=AF_PACKET, proto=htons(ETH_P_IP), if=all(0),
                 pkttype=PACKET_HOST, addr(0)={0, }, 20) = 0
      
      sock-bind-2:
        socket(PF_PACKET, SOCK_RAW, htons(ETH_P_IP)) = 3
        bind(3, {sa_family=AF_PACKET, proto=htons(ETH_P_IP), if=lo(1),
                 pkttype=PACKET_HOST, addr(0)={0, }, 20) = 0
      
      sock-bind-3:
        socket(PF_PACKET, SOCK_RAW, 0) = 3
        bind(3, {sa_family=AF_PACKET, proto=htons(ETH_P_IP), if=lo(1),
                 pkttype=PACKET_HOST, addr(0)={0, }, 20) = 0
      Signed-off-by: default avatarDaniel Borkmann <dborkman@redhat.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      902fefb8
    • David S. Miller's avatar
      i40e: Remove autogenerated Module.symvers file. · ec48a787
      David S. Miller authored
      Fixes: 9d8bf547 ("i40e: associate VMDq queue with VM type")
      Reported-by: default avatarStephen Hemminger <stephen@networkplumber.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      ec48a787
    • Paul Gortmaker's avatar
      net/ipv4: don't use module_init in non-modular gre_offload · cf172283
      Paul Gortmaker authored
      Recent commit 438e38fa
      ("gre_offload: statically build GRE offloading support") added
      new module_init/module_exit calls to the gre_offload.c file.
      
      The file is obj-y and can't be anything other than built-in.
      Currently it can never be built modular, so using module_init
      as an alias for __initcall can be somewhat misleading.
      
      Fix this up now, so that we can relocate module_init from
      init.h into module.h in the future.  If we don't do this, we'd
      have to add module.h to obviously non-modular code, and that
      would be a worse thing.  We also make the inclusion explicit.
      
      Note that direct use of __initcall is discouraged, vs. one
      of the priority categorized subgroups.  As __initcall gets
      mapped onto device_initcall, our use of device_initcall
      directly in this change means that the runtime impact is
      zero -- it will remain at level 6 in initcall ordering.
      
      As for the module_exit, rather than replace it with __exitcall,
      we simply remove it, since it appears only UML does anything
      with those, and even for UML, there is no relevant cleanup
      to be done here.
      
      Cc: Eric Dumazet <edumazet@google.com>
      Signed-off-by: default avatarPaul Gortmaker <paul.gortmaker@windriver.com>
      Acked-by: default avatarEric Dumazet <edumazet@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      cf172283
    • Paul Bolle's avatar
      net/mlx4_core: clean up srq_res_start_move_to() · f088cbb8
      Paul Bolle authored
      Building resource_tracker.o triggers a GCC warning:
          drivers/net/ethernet/mellanox/mlx4/resource_tracker.c: In function 'mlx4_HW2SW_SRQ_wrapper':
          drivers/net/ethernet/mellanox/mlx4/resource_tracker.c:3202:17: warning: 'srq' may be used uninitialized in this function [-Wmaybe-uninitialized]
            atomic_dec(&srq->mtt->ref_count);
                           ^
      
      This is a false positive. But a cleanup of srq_res_start_move_to() can
      help GCC here. The code currently uses a switch statement where a plain
      if/else would do, since only two of the switch's four cases can ever
      occur. Dropping that switch makes the warning go away.
      
      While we're at it, add some missing braces, and convert state to the
      correct type.
      Signed-off-by: default avatarPaul Bolle <pebolle@tiscali.nl>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      f088cbb8
    • Paul Bolle's avatar
      net/mlx4_core: clean up cq_res_start_move_to() · c9218a9e
      Paul Bolle authored
      Building resource_tracker.o triggers a GCC warning:
          drivers/net/ethernet/mellanox/mlx4/resource_tracker.c: In function 'mlx4_HW2SW_CQ_wrapper':
          drivers/net/ethernet/mellanox/mlx4/resource_tracker.c:3019:16: warning: 'cq' may be used uninitialized in this function [-Wmaybe-uninitialized]
            atomic_dec(&cq->mtt->ref_count);
                          ^
      
      This is a false positive. But a cleanup of cq_res_start_move_to() can
      help GCC here. The code currently uses a switch statement where an
      if/else construct would do too, since only two of the switch's four
      cases can ever occur. Dropping that switch makes the warning go away.
      
      While we're at it, add some missing braces.
      Signed-off-by: default avatarPaul Bolle <pebolle@tiscali.nl>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c9218a9e
  2. 16 Jan, 2014 25 commits