1. 14 Mar, 2016 40 commits
    • Sergei Shtylyov's avatar
      of_mdio: use PTR_ERR_OR_ZERO() · 5189b1d8
      Sergei Shtylyov authored
      PTR_ERR_OR_ZERO() is open coded in of_phy_register_fixed_link(), so just
      call it directly...
      Signed-off-by: default avatarSergei Shtylyov <sergei.shtylyov@cogentembedded.com>
      Reviewed-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
      Reviewed-by: default avatarVladimir Zapolskiy <vz@mleia.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      5189b1d8
    • Sergei Shtylyov's avatar
      of_mdio: use IS_ERR_OR_NULL() · ac044b90
      Sergei Shtylyov authored
      IS_ERR_OR_NULL() is open coded in of_mdiobus_register_phy(), so just call
      it directly...
      Signed-off-by: default avatarSergei Shtylyov <sergei.shtylyov@cogentembedded.com>
      Reviewed-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      ac044b90
    • Sergei Shtylyov's avatar
      of_mdio: mdio_device_create() never returns NULL · a3478bae
      Sergei Shtylyov authored
      mdio_device_create() never returns NULL, thus checking for it in
      of_mdiobus_register_device() is pointless...
      Suggested-by: default avatarVladimir Zapolskiy <vz@mleia.com>
      Signed-off-by: default avatarSergei Shtylyov <sergei.shtylyov@cogentembedded.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      a3478bae
    • David S. Miller's avatar
      Merge branch 'thunderx-phy' · 1f3a1c54
      David S. Miller authored
      David Daney says:
      
      ====================
      net/phy: Improvements to Cavium Thunder MDIO code.
      
      Changes from v1:
      
       - In 1/3 Add back check for non-OF objects in bgx_init_of_phy().  It
         is probably not necessary, but better safe than sorry...
      
      The firmware on many Cavium Thunder systems configures the MDIO bus
      hardware to be probed as a PCI device.  In order to use the MDIO bus
      drivers in this configuration, we must add PCI probing to the driver.
      
      There are two parts to this set of three patches:
      
       1) Cleanup the PHY probing code in thunder_bgx.c to handle the case
          where there is no PHY attached to a port, as well as being more
          robust in the face of driver loading order by use of
          -EPROBE_DEFER.
      
       2) Split mdio-octeon.c into two drivers, one with platform probing,
       and the other with PCI probing.  Common code is shared between the
       two.
      
      Tested on several different Thunder and OCTEON systems, also compile
      tested on x86_64.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      1f3a1c54
    • David Daney's avatar
      phy: mdio-thunder: Add driver for Cavium Thunder SoC MDIO buses. · 379d7ac7
      David Daney authored
      The Cavium Thunder SoCs have multiple MIDO buses that are part of a
      single PCI device.  To model this in the device tree we call the PCI
      parent device a "cavium,thunder-8890-mdio-nexus", it has several
      children, one for each MDIO bus.
      
      The MDIO bus hardware is identical to that found in the OCTEON SoCs,
      so we use that code for things that are not part of the PCI driver
      probe/remove
      Signed-off-by: default avatarDavid Daney <david.daney@cavium.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      379d7ac7
    • David Daney's avatar
      phy: mdio-octeon: Refactor into two files/modules · 1eefee90
      David Daney authored
      A follow-on patch uses PCI probing to find the Thunder MDIO hardware.
      In preparation for this, split out the common code into a new file
      mdio-cavium.c, which will be used by both the existing OCTEON driver,
      and the new Thunder PCI based driver.
      
      As part of the refactoring simplify the struct cavium_mdiobus by
      removing fields that are only ever used in the probe function and can
      just as well be local variables.
      
      Use readq/writeq in preference to readq_relaxed/writeq_relaxed as the
      relaxed form was an optimization for an early chip revision, and the
      MDIO drivers are not performance bottlenecks that need optimization in
      the first place.
      Signed-off-by: default avatarDavid Daney <david.daney@cavium.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      1eefee90
    • David Daney's avatar
      net: thunderx: Cleanup PHY probing code. · 5fc7cf17
      David Daney authored
      Remove the call to force the octeon-mdio driver to be loaded.  Allow
      the standard driver loading mechanisms to load the PHY drivers, and
      use -EPROBE_DEFER to cause the BGX driver to be probed only after the
      PHY drivers are available.
      
      Reorder the setting of MAC addresses and PHY probing to allow BGX
      LMACs with no attached PHY to still be assigned a MAC address.
      Signed-off-by: default avatarDavid Daney <david.daney@cavium.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      5fc7cf17
    • Anna-Maria Gleixner's avatar
      net: mvneta: Add missing hotplug notifier transition · 0df83e7a
      Anna-Maria Gleixner authored
      The mvneta_percpu_notifier() hotplug callback lacks handling of the
      CPU_DOWN_FAILED case. That means, if CPU_DOWN_PREPARE failes, the
      driver is not well configured on the CPU.
      
      Add handling for CPU_DOWN_FAILED[_FROZEN] hotplug notifier transition
      to setup the driver.
      
      Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
      Cc: netdev@vger.kernel.org
      Signed-off-by: default avatarAnna-Maria Gleixner <anna-maria@linutronix.de>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0df83e7a
    • Igal Liberman's avatar
      fsl/fman: fix dtsec_set_tx_pause_frames · 7c82a7b9
      Igal Liberman authored
      Fix a bug introduced in e06a03bd (fsl/fman: fix the pause_time test)
      When pause_time is set to '0' - pause frames are disabled and
      there's no need to apply dTSEC-A003 Errata workaround.
      Signed-off-by: default avatarIgal Liberman <igal.liberman@freescale.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      7c82a7b9
    • Florian Fainelli's avatar
      Documentation: networking: phy.txt: Add missing functions · 387178ec
      Florian Fainelli authored
      Some new development in PHYLIB added new function pointers to the struct
      phy_driver, document these.
      Signed-off-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      387178ec
    • Martin KaFai Lau's avatar
      tcp: Add RFC4898 tcpEStatsPerfDataSegsOut/In · a44d6eac
      Martin KaFai Lau authored
      Per RFC4898, they count segments sent/received
      containing a positive length data segment (that includes
      retransmission segments carrying data).  Unlike
      tcpi_segs_out/in, tcpi_data_segs_out/in excludes segments
      carrying no data (e.g. pure ack).
      
      The patch also updates the segs_in in tcp_fastopen_add_skb()
      so that segs_in >= data_segs_in property is kept.
      
      Together with retransmission data, tcpi_data_segs_out
      gives a better signal on the rxmit rate.
      
      v6: Rebase on the latest net-next
      
      v5: Eric pointed out that checking skb->len is still needed in
      tcp_fastopen_add_skb() because skb can carry a FIN without data.
      Hence, instead of open coding segs_in and data_segs_in, tcp_segs_in()
      helper is used.  Comment is added to the fastopen case to explain why
      segs_in has to be reset and tcp_segs_in() has to be called before
      __skb_pull().
      
      v4: Add comment to the changes in tcp_fastopen_add_skb()
      and also add remark on this case in the commit message.
      
      v3: Add const modifier to the skb parameter in tcp_segs_in()
      
      v2: Rework based on recent fix by Eric:
      commit a9d99ce2 ("tcp: fix tcpi_segs_in after connection establishment")
      Signed-off-by: default avatarMartin KaFai Lau <kafai@fb.com>
      Cc: Chris Rapier <rapier@psc.edu>
      Cc: Eric Dumazet <edumazet@google.com>
      Cc: Marcelo Ricardo Leitner <mleitner@redhat.com>
      Cc: Neal Cardwell <ncardwell@google.com>
      Cc: Yuchung Cheng <ycheng@google.com>
      Acked-by: default avatarEric Dumazet <edumazet@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      a44d6eac
    • Arnd Bergmann's avatar
      vmxnet3: fix lock imbalance in vmxnet3_tq_xmit() · efc21d95
      Arnd Bergmann authored
      A recent bug fix rearranged the code in vmxnet3_tq_xmit() in a
      way that left the error handling for oversized headers unlock
      a lock that had not been taken yet. Gcc warns about the incorrect
      use of the 'flags' variable because of that:
      
      drivers/net/vmxnet3/vmxnet3_drv.c: In function 'vmxnet3_tq_xmit.constprop':
      include/linux/spinlock.h:246:3: error: 'flags' may be used uninitialized in this function [-Werror=maybe-uninitialized]
      
      This changes the error handling path to 'goto' the end of the function
      beyond the lock/unlock pair.
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Fixes: cec05562 ("vmxnet3: avoid calling pskb_may_pull with interrupts disabled")
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      efc21d95
    • David S. Miller's avatar
      Merge branch 'net-gcc60-fixes' · 888506a9
      David S. Miller authored
      Arnd Bergmann says:
      
      ====================
      net: gcc-6.0 warning fixes
      
      I've just installed gcc-6.0 to see what kinds of new warnings
      we get. It turns out that it's actually really useful once I
      disabled -Wunused-const-variable, and all of the warnings it
      found in network drivers seem valid.
      
      Sorry for the bad timing in the merge window, but I figured
      it would be better to send the fixes as I found the bugs
      rather than waiting for the next cycle. The first three
      look appropriate for stable backports.
      
      The other two only fix a gcc warning about incorrect whitespace,
      probably not worth backporting those.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      888506a9
    • Arnd Bergmann's avatar
      net: caif: fix misleading indentation · 8e0cc8c3
      Arnd Bergmann authored
      gcc points out code that is not indented the way it is
      interpreted:
      
      net/caif/cfpkt_skbuff.c: In function 'cfpkt_setlen':
      net/caif/cfpkt_skbuff.c:289:4: error: statement is indented as if it were guarded by... [-Werror=misleading-indentation]
          return cfpkt_getlen(pkt);
          ^~~~~~
      net/caif/cfpkt_skbuff.c:286:3: note: ...this 'else' clause, but it is not
         else
         ^~~~
      
      It is clear from the context that not returning here would be
      a bug, as we'd end up passing a negative length into a function
      that takes a u16 length, so it is not missing curly braces
      here, and I'm assuming that the indentation is the only part
      that's wrong about it.
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      8e0cc8c3
    • Arnd Bergmann's avatar
      ath9k: fix misleading indentation · 362210e0
      Arnd Bergmann authored
      A cleanup patch in linux-3.18 moved around some code in the ath9k
      driver and left some code to be indented in a misleading way,
      made worse by the addition of some new code for p2p mode, as
      discovered by a new gcc-6 warning:
      
      drivers/net/wireless/ath/ath9k/init.c: In function 'ath9k_set_hw_capab':
      drivers/net/wireless/ath/ath9k/init.c:851:4: warning: statement is indented as if it were guarded by... [-Wmisleading-indentation]
          hw->wiphy->iface_combinations = if_comb;
          ^~
      drivers/net/wireless/ath/ath9k/init.c:847:3: note: ...this 'if' clause, but it is not
         if (ath9k_is_chanctx_enabled())
         ^~
      
      The code is in fact correct, but the indentation is not, so I'm
      reformatting it as it should have been after the original cleanup.
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Fixes: 499afacc ("ath9k: Isolate ath9k_use_chanctx module parameter")
      Fixes: eb61f9f6 ("ath9k: advertise p2p dev support when chanctx")
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      362210e0
    • Arnd Bergmann's avatar
      ath9k: fix buffer overrun for ar9287 · 83d6f1f1
      Arnd Bergmann authored
      Code that was added back in 2.6.38 has an obvious overflow
      when accessing a static array, and at the time it was added
      only a code comment was put in front of it as a reminder
      to have it reviewed properly.
      
      This has not happened, but gcc-6 now points to the specific
      overflow:
      
      drivers/net/wireless/ath/ath9k/eeprom.c: In function 'ath9k_hw_get_gain_boundaries_pdadcs':
      drivers/net/wireless/ath/ath9k/eeprom.c:483:44: error: array subscript is above array bounds [-Werror=array-bounds]
           maxPwrT4[i] = data_9287[idxL].pwrPdg[i][4];
                         ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
      
      It turns out that the correct array length exists in the local
      'intercepts' variable of this function, so we can just use that
      instead of hardcoding '4', so this patch changes all three
      instances to use that variable. The other two instances were
      already correct, but it's more consistent this way.
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Fixes: 940cd2c1 ("ath9k_hw: merge the ar9287 version of ath9k_hw_get_gain_boundaries_pdadcs")
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      83d6f1f1
    • Arnd Bergmann's avatar
      farsync: fix off-by-one bug in fst_add_one · e725a66c
      Arnd Bergmann authored
      gcc-6 finds an out of bounds access in the fst_add_one function
      when calculating the end of the mmio area:
      
      drivers/net/wan/farsync.c: In function 'fst_add_one':
      drivers/net/wan/farsync.c:418:53: error: index 2 denotes an offset greater than size of 'u8[2][8192] {aka unsigned char[2][8192]}' [-Werror=array-bounds]
       #define BUF_OFFSET(X)   (BFM_BASE + offsetof(struct buf_window, X))
                                                           ^
      include/linux/compiler-gcc.h:158:21: note: in definition of macro '__compiler_offsetof'
        __builtin_offsetof(a, b)
                           ^
      drivers/net/wan/farsync.c:418:37: note: in expansion of macro 'offsetof'
       #define BUF_OFFSET(X)   (BFM_BASE + offsetof(struct buf_window, X))
                                           ^~~~~~~~
      drivers/net/wan/farsync.c:2519:36: note: in expansion of macro 'BUF_OFFSET'
                                        + BUF_OFFSET ( txBuffer[i][NUM_TX_BUFFER][0]);
                                          ^~~~~~~~~~
      
      The warning is correct, but not critical because this appears
      to be a write-only variable that is set by each WAN driver but
      never accessed afterwards.
      
      I'm taking the minimal fix here, using the correct pointer by
      pointing 'mem_end' to the last byte inside of the register area
      as all other WAN drivers do, rather than the first byte outside of
      it. An alternative would be to just remove the mem_end member
      entirely.
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e725a66c
    • Arnd Bergmann's avatar
      mlx4: add missing braces in verify_qp_parameters · baefd701
      Arnd Bergmann authored
      The implementation of QP paravirtualization back in linux-3.7 included
      some code that looks very dubious, and gcc-6 has grown smart enough
      to warn about it:
      
      drivers/net/ethernet/mellanox/mlx4/resource_tracker.c: In function 'verify_qp_parameters':
      drivers/net/ethernet/mellanox/mlx4/resource_tracker.c:3154:5: error: statement is indented as if it were guarded by... [-Werror=misleading-indentation]
           if (optpar & MLX4_QP_OPTPAR_ALT_ADDR_PATH) {
           ^~
      drivers/net/ethernet/mellanox/mlx4/resource_tracker.c:3144:4: note: ...this 'if' clause, but it is not
          if (slave != mlx4_master_func_num(dev))
      
      >From looking at the context, I'm reasonably sure that the indentation
      is correct but that it should have contained curly braces from the
      start, as the update_gid() function in the same patch correctly does.
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Fixes: 54679e14 ("mlx4: Implement QP paravirtualization and maintain phys_pkey_cache for smp_snoop")
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      baefd701
    • Arnd Bergmann's avatar
      net: mediatek: check device_reset return code · 916848ca
      Arnd Bergmann authored
      The device_reset() function may fail, so we have to check
      its return value, e.g. to make deferred probing work correctly.
      gcc warns about it because of the warn_unused_result attribute:
      
      drivers/net/ethernet/mediatek/mtk_eth_soc.c: In function 'mtk_probe':
      drivers/net/ethernet/mediatek/mtk_eth_soc.c:1679:2: error: ignoring return value of 'device_reset', declared with attribute warn_unused_result [-Werror=unused-result]
      
      This adds the trivial error check to propagate the return value
      to the generic platform device probe code.
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      916848ca
    • Arnd Bergmann's avatar
      net: mediatek: remove incorrect dma_mask assignment · a25cdc0d
      Arnd Bergmann authored
      Device drivers should not mess with the DMA mask directly,
      but instead call dma_set_mask() etc if needed.
      
      In case of the mtk_eth_soc driver, the mask already gets set
      correctly when the device is created, and setting it again
      is against the documented API.
      
      This removes the incorrect setting.
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      a25cdc0d
    • Arnd Bergmann's avatar
      net: mediatek: use dma_addr_t correctly · 6aab1a62
      Arnd Bergmann authored
      dma_alloc_coherent() expects a dma_addr_t pointer as its argument,
      not an 'unsigned int', and gcc correctly warns about broken
      code in the mtk_init_fq_dma function:
      
      drivers/net/ethernet/mediatek/mtk_eth_soc.c: In function 'mtk_init_fq_dma':
      drivers/net/ethernet/mediatek/mtk_eth_soc.c:463:13: error: passing argument 3 of 'dma_alloc_coherent' from incompatible pointer type [-Werror=incompatible-pointer-types]
      
      This changes the type of the local variable to dma_addr_t.
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      6aab1a62
    • Arnaldo Carvalho de Melo's avatar
      net: Fix use after free in the recvmmsg exit path · 34b88a68
      Arnaldo Carvalho de Melo authored
      The syzkaller fuzzer hit the following use-after-free:
      
        Call Trace:
         [<ffffffff8175ea0e>] __asan_report_load8_noabort+0x3e/0x40 mm/kasan/report.c:295
         [<ffffffff851cc31a>] __sys_recvmmsg+0x6fa/0x7f0 net/socket.c:2261
         [<     inline     >] SYSC_recvmmsg net/socket.c:2281
         [<ffffffff851cc57f>] SyS_recvmmsg+0x16f/0x180 net/socket.c:2270
         [<ffffffff86332bb6>] entry_SYSCALL_64_fastpath+0x16/0x7a
        arch/x86/entry/entry_64.S:185
      
      And, as Dmitry rightly assessed, that is because we can drop the
      reference and then touch it when the underlying recvmsg calls return
      some packets and then hit an error, which will make recvmmsg to set
      sock->sk->sk_err, oops, fix it.
      Reported-and-Tested-by: default avatarDmitry Vyukov <dvyukov@google.com>
      Cc: Alexander Potapenko <glider@google.com>
      Cc: Eric Dumazet <edumazet@google.com>
      Cc: Kostya Serebryany <kcc@google.com>
      Cc: Sasha Levin <sasha.levin@oracle.com>
      Fixes: a2e27255 ("net: Introduce recvmmsg socket syscall")
      http://lkml.kernel.org/r/20160122211644.GC2470@redhat.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      34b88a68
    • David S. Miller's avatar
      Merge branch 'thunderx-perf' · b6e40382
      David S. Miller authored
      Sunil Goutham says:
      
      ====================
      net: thunderx: Performance enhancement changes
      
      Below patches attempts to improve performance by reducing
      no of atomic operations while allocating new receive buffers
      and reducing cache misses by adjusting nicvf structure elements.
      
      Changes from v1:
       No changes, resubmitting a fresh as per David's suggestion.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      b6e40382
    • Sunil Goutham's avatar
      net: thunderx: Adjust nicvf structure to reduce cache misses · 1d368790
      Sunil Goutham authored
      Adjusted nicvf structure such that all elements used in hot
      path like napi, xmit e.t.c fall into same cache line. This reduced
      no of cache misses and resulted in ~2% increase in no of packets
      handled on a core.
      
      Also modified elements with :1 notation to boolean, to be
      consistent with other element definitions.
      Signed-off-by: default avatarSunil Goutham <sgoutham@cavium.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      1d368790
    • Sunil Goutham's avatar
      net: thunderx: Set recevie buffer page usage count in bulk · 5c2e26f6
      Sunil Goutham authored
      Instead of calling get_page() for every receive buffer carved out
      of page, set page's usage count at the end, to reduce no of atomic
      calls.
      Signed-off-by: default avatarSunil Goutham <sgoutham@cavium.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      5c2e26f6
    • Richard Alpe's avatar
      tipc: make sure IPv6 header fits in skb headroom · 9bd160bf
      Richard Alpe authored
      Expand headroom further in order to be able to fit the larger IPv6
      header. Prior to this patch this caused a skb under panic for certain
      tipc packets when using IPv6 UDP bearer(s).
      Signed-off-by: default avatarRichard Alpe <richard.alpe@ericsson.com>
      Acked-by: default avatarJon Maloy <jon.maloy@ericsson.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      9bd160bf
    • David S. Miller's avatar
      Merge branch 'mvneta-hwbm' · c9214f50
      David S. Miller authored
      Gregory CLEMENT says:
      
      ====================
      API set for HW Buffer management
      
      This is the sixth version of the API set for HW Buffer management (that was
      initially submitted here:
      http://thread.gmane.org/gmane.linux.kernel/2125152).
      
      This version is just a rebasing onto the last net-next. I also added
      the Tested-by flag from Sebastian Careba : "The patch set applies
      successfully and it works well, no more Samba issues any longer".
      
      For the record in the previous versions I made the following changes:
      v4 -> v5:
      - Add a field with the size of the buffer of the pool was added. It
        then allow to fix some misused size in the mvneta_bm code when using
        the new framework.
      
      - Add a new patch from Marcin for sram allowing to require
        non-bufferable access to the memory. It was needed for the hardware
        buffer management of the mvneta.
      
      - Fix the build issue notified by the 0-day builder when building the
        drivers as module.
      
      v3 -> v4
      - Fix build issue when HWBM is not selected
      
      v2 -> v3
      - Make a HWBM and a SWBM version of the mvneta_rx() function in order
        to reduce the the conditional code. Kept a condition inside the
        mvneta_poll because specializing this function would have means
        duplicating 95% of the code.
      
      - Put back the register_netdev() call at the end of the mvneta_probe()
        function. In order to have a unique ID for each port, just used a
        global variable in the driver.
      
      - Added a fix from Marcin in the "net: mvneta: bm: add support for
        hardware buffer management" patch: "when dropping packets, only
        buffer pointers passed from BM to descriptors have to be returned to
        the pool. In submitted version after closing the port and
        mvneta_rxq_deinit(), it was very likely that a lot of fake buffers
        are added to the pool, because all descriptors took part in
        iteration."
      
      - Removed the select MVNETA_BM from the Kconfig, it will let the user
        the choice to use not use it if they want.
      
      v1 -> v2
      - The hardware buffer management helpers are no more built by default
        and now depend on a hidden config symbol which has to be selected
        by the driver if needed
      - The hwbm_pool_refill() and hwbm_pool_add() now receive a gfp_t as
        argument allowing the caller to specify the flag it needs.
      - buf_num is now tested to ensure there is no wrapping
      - A spinlock has been added to protect the hwbm_pool_add() function in
        SMP or irq context.
      - used pr_warn instead of pr_debug in case of errors.
      - fixed the mvneta implementation by returning the buffer to the pool
        at various place instead of ignoring it.
      - Squashed "bus: mvenus-mbus: Fix size test for
         mvebu_mbus_get_dram_win_info" into bus: mvebu-mbus: provide api for
         obtaining IO and DRAM window information.
      - Added my signed-otf-by on all the patches as submitter of the series.
      - Renamed the dts patches with the pattern "ARM: dts: platform:"
      - Removed the patch "ARM: mvebu: enable SRAM support in
        mvebu_v7_defconfig" of this series and already applied it
      - Modified the order of the patches.
      
      In order to ease the test the branch mvneta-BM-framework-v6 is
      available at git@github.com:MISL-EBU-System-SW/mainline-public.git.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c9214f50
    • Gregory CLEMENT's avatar
      net: mvneta: Use the new hwbm framework · baa11ebc
      Gregory CLEMENT authored
      Now that the hardware buffer management framework had been introduced,
      let's use it.
      Tested-by: default avatarSebastian Careba <nitroshift@yahoo.com>
      Signed-off-by: default avatarGregory CLEMENT <gregory.clement@free-electrons.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      baa11ebc
    • Gregory CLEMENT's avatar
      net: add a hardware buffer management helper API · 8cb2d8bf
      Gregory CLEMENT authored
      This basic implementation allows to share code between driver using
      hardware buffer management. As the code is hardware agnostic, there is
      few helpers, most of the optimization brought by the an HW BM has to be
      done at driver level.
      Tested-by: default avatarSebastian Careba <nitroshift@yahoo.com>
      Signed-off-by: default avatarGregory CLEMENT <gregory.clement@free-electrons.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      8cb2d8bf
    • Marcin Wojtas's avatar
      net: mvneta: bm: add support for hardware buffer management · dc35a10f
      Marcin Wojtas authored
      Buffer manager (BM) is a dedicated hardware unit that can be used by all
      ethernet ports of Armada XP and 38x SoC's. It allows to offload CPU on RX
      path by sparing DRAM access on refilling buffer pool, hardware-based
      filling of descriptor ring data and better memory utilization due to HW
      arbitration for using 'short' pools for small packets.
      
      Tests performed with A388 SoC working as a network bridge between two
      packet generators showed increase of maximum processed 64B packets by
      ~20k (~555k packets with BM enabled vs ~535 packets without BM). Also
      when pushing 1500B-packets with a line rate achieved, CPU load decreased
      from around 25% without BM to 20% with BM.
      
      BM comprise up to 4 buffer pointers' (BP) rings kept in DRAM, which
      are called external BP pools - BPPE. Allocating and releasing buffer
      pointers (BP) to/from BPPE is performed indirectly by write/read access
      to a dedicated internal SRAM, where internal BP pools (BPPI) are placed.
      BM hardware controls status of BPPE automatically, as well as assigning
      proper buffers to RX descriptors. For more details please refer to
      Functional Specification of Armada XP or 38x SoC.
      
      In order to enable support for a separate hardware block, common for all
      ports, a new driver has to be implemented ('mvneta_bm'). It provides
      initialization sequence of address space, clocks, registers, SRAM,
      empty pools' structures and also obtaining optional configuration
      from DT (please refer to device tree binding documentation). mvneta_bm
      exposes also a necessary API to mvneta driver, as well as a dedicated
      structure with BM information (bm_priv), whose presence is used as a
      flag notifying of BM usage by port. It has to be ensured that mvneta_bm
      probe is executed prior to the ones in ports' driver. In case BM is not
      used or its probe fails, mvneta falls back to use software buffer
      management.
      
      A sequence executed in mvneta_probe function is modified in order to have
      an access to needed resources before possible port's BM initialization is
      done. According to port-pools mapping provided by DT appropriate registers
      are configured and the buffer pools are filled. RX path is modified
      accordingly. Becaues the hardware allows a wide variety of configuration
      options, following assumptions are made:
      * using BM mechanisms can be selectively disabled/enabled basing
        on DT configuration among the ports
      * 'long' pool's single buffer size is tied to port's MTU
      * using 'long' pool by port is obligatory and it cannot be shared
      * using 'short' pool for smaller packets is optional
      * one 'short' pool can be shared among all ports
      
      This commit enables hardware buffer management operation cooperating with
      existing mvneta driver. New device tree binding documentation is added and
      the one of mvneta is updated accordingly.
      
      [gregory.clement@free-electrons.com: removed the suspend/resume part]
      Signed-off-by: default avatarMarcin Wojtas <mw@semihalf.com>
      Signed-off-by: default avatarGregory CLEMENT <gregory.clement@free-electrons.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      dc35a10f
    • Marcin Wojtas's avatar
      bus: mvebu-mbus: provide api for obtaining IO and DRAM window information · f2900ace
      Marcin Wojtas authored
      This commit enables finding appropriate mbus window and obtaining its
      target id and attribute for given physical address in two separate
      routines, both for IO and DRAM windows. This functionality
      is needed for Armada XP/38x Network Controller's Buffer Manager and
      PnC configuration.
      
      [gregory.clement@free-electrons.com: Fix size test for
      mvebu_mbus_get_dram_win_info]
      Signed-off-by: default avatarMarcin Wojtas <mw@semihalf.com>
      [DRAM window information reference in LKv3.10]
      Signed-off-by: default avatarEvan Wang <xswang@marvell.com>
      Signed-off-by: default avatarGregory CLEMENT <gregory.clement@free-electrons.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      f2900ace
    • Gregory CLEMENT's avatar
      ARM: dts: armada-xp-openblocks-ax3-4: Add BM support · 293fdc24
      Gregory CLEMENT authored
      Allow Openblock AX3 using hardware buffer management with mvneta.
      Signed-off-by: default avatarGregory CLEMENT <gregory.clement@free-electrons.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      293fdc24
    • Marcin Wojtas's avatar
      ARM: dts: armada-xp: enable buffer manager support on Armada XP boards · 9dd7a57e
      Marcin Wojtas authored
      Since mvneta driver supports using hardware buffer management (BM), in
      order to use it, board files have to be adjusted accordingly. This commit
      enables BM on AXP-DB and AXP-GP in same manner - because number of ports
      on those boards is the same as number of possible pools, each port is
      supposed to use single pool for all kind of packets.
      
      Moreover appropriate entry is added to 'soc' node ranges, as well as "okay"
      status for 'bm' and 'bm-bppi' (internal SRAM) nodes.
      Signed-off-by: default avatarMarcin Wojtas <mw@semihalf.com>
      Signed-off-by: default avatarGregory CLEMENT <gregory.clement@free-electrons.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      9dd7a57e
    • Marcin Wojtas's avatar
      ARM: dts: armada-xp: add buffer manager nodes · ebae1376
      Marcin Wojtas authored
      Armada XP network controller supports hardware buffer management (BM).
      Since it is now enabled in mvneta driver, appropriate nodes can be added
      to armada-xp.dtsi - for the actual common BM unit (bm@c0000) and its
      internal SRAM (bm-bppi), which is used for indirect access to buffer
      pointer ring residing in DRAM.
      
      Pools - ports mapping, bm-bppi entry in 'soc' node's ranges and optional
      parameters are supposed to be set in board files.
      Signed-off-by: default avatarMarcin Wojtas <mw@semihalf.com>
      Signed-off-by: default avatarGregory CLEMENT <gregory.clement@free-electrons.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      ebae1376
    • Marcin Wojtas's avatar
      ARM: dts: armada-38x: enable buffer manager support on Armada 38x boards · c49e99c2
      Marcin Wojtas authored
      Since mvneta driver supports using hardware buffer management (BM), in
      order to use it, board files have to be adjusted accordingly. This commit
      enables BM on:
      * A385-DB-AP - each port has its own pool for long and common pool for
      short packets,
      * A388-ClearFog - same as above,
      * A388-DB - to each port unique 'short' and 'long' pools are mapped,
      * A388-GP - same as above.
      
      Moreover appropriate entry is added to 'soc' node ranges, as well as "okay"
      status for 'bm' and 'bm-bppi' (internal SRAM) nodes.
      
      [gregory.clement@free-electrons.com: add suppport for the ClearFog board]
      Signed-off-by: default avatarMarcin Wojtas <mw@semihalf.com>
      Signed-off-by: default avatarGregory CLEMENT <gregory.clement@free-electrons.com>
      Acked-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c49e99c2
    • Marcin Wojtas's avatar
      ARM: dts: armada-38x: add buffer manager nodes · 4a547a5a
      Marcin Wojtas authored
      Armada 38x network controller supports hardware buffer management (BM).
      Since it is now enabled in mvneta driver, appropriate nodes can be added
      to armada-38x.dtsi - for the actual common BM unit (bm@c8000) and its
      internal SRAM (bm-bppi), which is used for indirect access to buffer
      pointer ring residing in DRAM.
      
      Pools - ports mapping, bm-bppi entry in 'soc' node's ranges and optional
      parameters are supposed to be set in board files.
      Signed-off-by: default avatarMarcin Wojtas <mw@semihalf.com>
      Signed-off-by: default avatarGregory CLEMENT <gregory.clement@free-electrons.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      4a547a5a
    • Marcin Wojtas's avatar
      misc: sram: add optional ioremap without write combining · eb43e023
      Marcin Wojtas authored
      Some SRAM users may require non-bufferable access to the memory, which is
      impossible, because devm_ioremap_wc() is used for setting sram->virt_base.
      
      This commit adds optional flag 'no-memory-wc', which allow to choose remap
      method, using DT property. Documentation is updated accordingly.
      Signed-off-by: default avatarMarcin Wojtas <mw@semihalf.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      eb43e023
    • David S. Miller's avatar
      Merge tag 'wireless-drivers-next-for-davem-2016-03-14' of... · d3bf9b19
      David S. Miller authored
      Merge tag 'wireless-drivers-next-for-davem-2016-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/wireless-drivers-next
      
      Kalle Valo says:
      
      ====================
      wireless-drivers patches for 4.6
      
      Major changes:
      
      rtl8xxxu
      
      * add 8723bu support
      
      wl18xx
      
      * add radar_debug_mode debugfs file for DFS testing
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      d3bf9b19
    • David S. Miller's avatar
      Merge branch 'ipv4-ipv6-csums' · 20db778e
      David S. Miller authored
      Alexander Duyck says:
      
      ====================
      Fix differences between IPv4 and IPv6 TCP/UDP checksum calculation
      
      This patch series is meant to address the differences that exist between
      IPv4 and IPv6 in terms of checksum calculation.  Specifically the IPv6
      function csum_ipv6_magic treated length as a value that could be greater
      than 64K, while csum_tcpudp_magic was truncating the length at 16 bits.
      After looking over the code and giving it some thought I decided it would
      be best to update the IPv4 function so that it worked the same way the IPv6
      one did.  This allows us to get the same results given the same inputs for
      both functions.  As a result we can use the same processes to reverse the
      calculation in the event we need to do something like remove the length of
      the pseudo-header checksum.
      
      I also took the opportunity to standardize things so that the parameters
      for these functions all use the correct types.  IPv4 addresses are __be32,
      length should always be __u32, and protocol is a __u8.
      
      With this change in place it corrects an issue with UDP tunnels in which we
      were getting a checksum that was off by 1 when performing fragmentation on
      inner UDP packets.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      20db778e
    • Alexander Duyck's avatar
      GSO/UDP: Use skb->len instead of udph->len to determine length of original skb · 08334824
      Alexander Duyck authored
      It is possible for tunnels to end up generating IP or IPv6 datagrams that
      are larger than 64K and expecting to be segmented.  As such we need to deal
      with length values greater than 64K.  In order to accommodate this we need
      to update the code to work with a 32b length value instead of a 16b one.
      Signed-off-by: default avatarAlexander Duyck <aduyck@mirantis.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      08334824