1. 19 Jun, 2020 20 commits
  2. 17 Jun, 2020 8 commits
    • Gustavo A. R. Silva's avatar
      ethtool: ioctl: Use array_size() in copy_to_user() · 3dd14996
      Gustavo A. R. Silva authored
      Use array_size() helper instead of the open-coded version in
      copy_to_user(). These sorts of multiplication factors need to
      be wrapped in array_size().
      
      This issue was found with the help of Coccinelle and, audited and fixed
      manually.
      
      Addresses-KSPP-ID: https://github.com/KSPP/linux/issues/83Signed-off-by: default avatarGustavo A. R. Silva <gustavoars@kernel.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      3dd14996
    • Gustavo A. R. Silva's avatar
      liquidio: Replace vmalloc_node + memset with vzalloc_node and use array_size · 682591f7
      Gustavo A. R. Silva authored
      Use vzalloc/vzalloc_node instead of the vmalloc/vzalloc_node and memset.
      
      Also, notice that vzalloc_node() function has no 2-factor argument form
      to calculate the size for the allocation, so multiplication factors need
      to be wrapped in array_size().
      
      This issue was found with the help of Coccinelle and, audited and fixed
      manually.
      
      Addresses-KSPP-ID: https://github.com/KSPP/linux/issues/83Signed-off-by: default avatarGustavo A. R. Silva <gustavoars@kernel.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      682591f7
    • Hoang Huu Le's avatar
      tipc: update a binding service via broadcast · cad2929d
      Hoang Huu Le authored
      Currently, updating binding table (add service binding to
      name table/withdraw a service binding) is being sent over replicast.
      However, if we are scaling up clusters to > 100 nodes/containers this
      method is less affection because of looping through nodes in a cluster one
      by one.
      
      It is worth to use broadcast to update a binding service. This way, the
      binding table can be updated on all peer nodes in one shot.
      
      Broadcast is used when all peer nodes, as indicated by a new capability
      flag TIPC_NAMED_BCAST, support reception of this message type.
      
      Four problems need to be considered when introducing this feature.
      1) When establishing a link to a new peer node we still update this by a
      unicast 'bulk' update. This may lead to race conditions, where a later
      broadcast publication/withdrawal bypass the 'bulk', resulting in
      disordered publications, or even that a withdrawal may arrive before the
      corresponding publication. We solve this by adding an 'is_last_bulk' bit
      in the last bulk messages so that it can be distinguished from all other
      messages. Only when this message has arrived do we open up for reception
      of broadcast publications/withdrawals.
      
      2) When a first legacy node is added to the cluster all distribution
      will switch over to use the legacy 'replicast' method, while the
      opposite happens when the last legacy node leaves the cluster. This
      entails another risk of message disordering that has to be handled. We
      solve this by adding a sequence number to the broadcast/replicast
      messages, so that disordering can be discovered and corrected. Note
      however that we don't need to consider potential message loss or
      duplication at this protocol level.
      
      3) Bulk messages don't contain any sequence numbers, and will always
      arrive in order. Hence we must exempt those from the sequence number
      control and deliver them unconditionally. We solve this by adding a new
      'is_bulk' bit in those messages so that they can be recognized.
      
      4) Legacy messages, which don't contain any new bits or sequence
      numbers, but neither can arrive out of order, also need to be exempt
      from the initial synchronization and sequence number check, and
      delivered unconditionally. Therefore, we add another 'is_not_legacy' bit
      to all new messages so that those can be distinguished from legacy
      messages and the latter delivered directly.
      
      v1->v2:
       - fix warning issue reported by kbuild test robot <lkp@intel.com>
       - add santiy check to drop the publication message with a sequence
      number that is lower than the agreed synch point
      Signed-off-by: default avatarkernel test robot <lkp@intel.com>
      Signed-off-by: default avatarHoang Huu Le <hoang.h.le@dektech.com.au>
      Acked-by: default avatarJon Maloy <jmaloy@redhat.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      cad2929d
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net · 69119673
      Linus Torvalds authored
      Pull networking fixes from David Miller:
      
       1) Don't get per-cpu pointer with preemption enabled in nft_set_pipapo,
          fix from Stefano Brivio.
      
       2) Fix memory leak in ctnetlink, from Pablo Neira Ayuso.
      
       3) Multiple definitions of MPTCP_PM_MAX_ADDR, from Geliang Tang.
      
       4) Accidently disabling NAPI in non-error paths of macb_open(), from
          Charles Keepax.
      
       5) Fix races between alx_stop and alx_remove, from Zekun Shen.
      
       6) We forget to re-enable SRIOV during resume in bnxt_en driver, from
          Michael Chan.
      
       7) Fix memory leak in ipv6_mc_destroy_dev(), from Wang Hai.
      
       8) rxtx stats use wrong index in mvpp2 driver, from Sven Auhagen.
      
       9) Fix memory leak in mptcp_subflow_create_socket error path, from Wei
          Yongjun.
      
      10) We should not adjust the TCP window advertised when sending dup acks
          in non-SACK mode, because it won't be counted as a dup by the sender
          if the window size changes. From Eric Dumazet.
      
      11) Destroy the right number of queues during remove in mvpp2 driver,
          from Sven Auhagen.
      
      12) Various WOL and PM fixes to e1000 driver, from Chen Yu, Vaibhav
          Gupta, and Arnd Bergmann.
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (35 commits)
        e1000e: fix unused-function warning
        e1000: use generic power management
        e1000e: Do not wake up the system via WOL if device wakeup is disabled
        lan743x: add MODULE_DEVICE_TABLE for module loading alias
        mlxsw: spectrum: Adjust headroom buffers for 8x ports
        bareudp: Fixed configuration to avoid having garbage values
        mvpp2: remove module bugfix
        tcp: grow window for OOO packets only for SACK flows
        mptcp: fix memory leak in mptcp_subflow_create_socket()
        netfilter: flowtable: Make nf_flow_table_offload_add/del_cb inline
        net/sched: act_ct: Make tcf_ct_flow_table_restore_skb inline
        net: dsa: sja1105: fix PTP timestamping with large tc-taprio cycles
        mvpp2: ethtool rxtx stats fix
        MAINTAINERS: switch to my private email for Renesas Ethernet drivers
        rocker: fix incorrect error handling in dma_rings_init
        test_objagg: Fix potential memory leak in error handling
        net: ethernet: mtk-star-emac: simplify interrupt handling
        mld: fix memory leak in ipv6_mc_destroy_dev()
        bnxt_en: Return from timer if interface is not in open state.
        bnxt_en: Fix AER reset logic on 57500 chips.
        ...
      69119673
    • Linus Torvalds's avatar
      Merge tag 'afs-fixes-20200616' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs · 26c20ffc
      Linus Torvalds authored
      Pull AFS fixes from David Howells:
       "I've managed to get xfstests kind of working with afs. Here are a set
        of patches that fix most of the bugs found.
      
        There are a number of primary issues:
      
         - Incorrect handling of mtime and non-handling of ctime. It might be
           argued, that the latter isn't a bug since the AFS protocol doesn't
           support ctime, but I should probably still update it locally.
      
         - Shared-write mmap, truncate and writeback bugs. This includes not
           changing i_size under the callback lock, overwriting local i_size
           with the reply from the server after a partial writeback, not
           limiting the writeback from an mmapped page to EOF.
      
         - Checks for an abort code indicating that the primary vnode in an
           operation was deleted by a third-party are done in the wrong place.
      
         - Silly rename bugs. This includes an incomplete conversion to the
           new operation handling, duplicate nlink handling, nlink changing
           not being done inside the callback lock and insufficient handling
           of third-party conflicting directory changes.
      
        And some secondary ones:
      
         - The UAEOVERFLOW abort code should map to EOVERFLOW not EREMOTEIO.
      
         - Remove a couple of unused or incompletely used bits.
      
         - Remove a couple of redundant success checks.
      
        These seem to fix all the data-corruption bugs found by
      
      	./check -afs -g quick
      
        along with the obvious silly rename bugs and time bugs.
      
        There are still some test failures, but they seem to fall into two
        classes: firstly, the authentication/security model is different to
        the standard UNIX model and permission is arbitrated by the server and
        cached locally; and secondly, there are a number of features that AFS
        does not support (such as mknod). But in these cases, the tests
        themselves need to be adapted or skipped.
      
        Using the in-kernel afs client with xfstests also found a bug in the
        AuriStor AFS server that has been fixed for a future release"
      
      * tag 'afs-fixes-20200616' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
        afs: Fix silly rename
        afs: afs_vnode_commit_status() doesn't need to check the RPC error
        afs: Fix use of afs_check_for_remote_deletion()
        afs: Remove afs_operation::abort_code
        afs: Fix yfs_fs_fetch_status() to honour vnode selector
        afs: Remove yfs_fs_fetch_file_status() as it's not used
        afs: Fix the mapping of the UAEOVERFLOW abort code
        afs: Fix truncation issues and mmap writeback size
        afs: Concoct ctimes
        afs: Fix EOF corruption
        afs: afs_write_end() should change i_size under the right lock
        afs: Fix non-setting of mtime when writing into mmap
      26c20ffc
    • Randy Dunlap's avatar
      Documentation: remove SH-5 index entries · f17957f7
      Randy Dunlap authored
      Remove SH-5 documentation index entries following the removal
      of SH-5 source code.
      
      Error: Cannot open file ../arch/sh/mm/tlb-sh5.c
      Error: Cannot open file ../arch/sh/mm/tlb-sh5.c
      Error: Cannot open file ../arch/sh/include/asm/tlb_64.h
      Error: Cannot open file ../arch/sh/include/asm/tlb_64.h
      
      Fixes: 3b69e8b4 ("Merge tag 'sh-for-5.8' of git://git.libc.org/linux-sh")
      Signed-off-by: default avatarRandy Dunlap <rdunlap@infradead.org>
      Reviewed-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
      Cc: Rich Felker <dalias@libc.org>
      Cc: Christoph Hellwig <hch@infradead.org>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: ysato@users.sourceforge.jp
      Cc: linux-sh@vger.kernel.org
      Cc: Geert Uytterhoeven <geert@linux-m68k.org>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      f17957f7
    • Linus Torvalds's avatar
      Merge tag 'flex-array-conversions-5.8-rc2' of... · ffbc9376
      Linus Torvalds authored
      Merge tag 'flex-array-conversions-5.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux
      
      Pull flexible-array member conversions from Gustavo A. R. Silva:
       "Replace zero-length arrays with flexible-array members.
      
        Notice that all of these patches have been baking in linux-next for
        two development cycles now.
      
        There is a regular need in the kernel to provide a way to declare
        having a dynamically sized set of trailing elements in a structure.
        Kernel code should always use “flexible array members”[1] for these
        cases. The older style of one-element or zero-length arrays should no
        longer be used[2].
      
        C99 introduced “flexible array members”, which lacks a numeric size
        for the array declaration entirely:
      
              struct something {
                      size_t count;
                      struct foo items[];
              };
      
        This is the way the kernel expects dynamically sized trailing elements
        to be declared. It allows the compiler to generate errors when the
        flexible array does not occur last in the structure, which helps to
        prevent some kind of undefined behavior[3] bugs from being
        inadvertently introduced to the codebase.
      
        It also allows the compiler to correctly analyze array sizes (via
        sizeof(), CONFIG_FORTIFY_SOURCE, and CONFIG_UBSAN_BOUNDS). For
        instance, there is no mechanism that warns us that the following
        application of the sizeof() operator to a zero-length array always
        results in zero:
      
              struct something {
                      size_t count;
                      struct foo items[0];
              };
      
              struct something *instance;
      
              instance = kmalloc(struct_size(instance, items, count), GFP_KERNEL);
              instance->count = count;
      
              size = sizeof(instance->items) * instance->count;
              memcpy(instance->items, source, size);
      
        At the last line of code above, size turns out to be zero, when one
        might have thought it represents the total size in bytes of the
        dynamic memory recently allocated for the trailing array items. Here
        are a couple examples of this issue[4][5].
      
        Instead, flexible array members have incomplete type, and so the
        sizeof() operator may not be applied[6], so any misuse of such
        operators will be immediately noticed at build time.
      
        The cleanest and least error-prone way to implement this is through
        the use of a flexible array member:
      
              struct something {
                      size_t count;
                      struct foo items[];
              };
      
              struct something *instance;
      
              instance = kmalloc(struct_size(instance, items, count), GFP_KERNEL);
              instance->count = count;
      
              size = sizeof(instance->items[0]) * instance->count;
              memcpy(instance->items, source, size);
      
        instead"
      
      [1] https://en.wikipedia.org/wiki/Flexible_array_member
      [2] https://github.com/KSPP/linux/issues/21
      [3] commit 76497732 ("cxgb3/l2t: Fix undefined behaviour")
      [4] commit f2cd32a4 ("rndis_wlan: Remove logically dead code")
      [5] commit ab91c2a8 ("tpm: eventlog: Replace zero-length array with flexible-array member")
      [6] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
      
      * tag 'flex-array-conversions-5.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux: (41 commits)
        w1: Replace zero-length array with flexible-array
        tracing/probe: Replace zero-length array with flexible-array
        soc: ti: Replace zero-length array with flexible-array
        tifm: Replace zero-length array with flexible-array
        dmaengine: tegra-apb: Replace zero-length array with flexible-array
        stm class: Replace zero-length array with flexible-array
        Squashfs: Replace zero-length array with flexible-array
        ASoC: SOF: Replace zero-length array with flexible-array
        ima: Replace zero-length array with flexible-array
        sctp: Replace zero-length array with flexible-array
        phy: samsung: Replace zero-length array with flexible-array
        RxRPC: Replace zero-length array with flexible-array
        rapidio: Replace zero-length array with flexible-array
        media: pwc: Replace zero-length array with flexible-array
        firmware: pcdp: Replace zero-length array with flexible-array
        oprofile: Replace zero-length array with flexible-array
        block: Replace zero-length array with flexible-array
        tools/testing/nvdimm: Replace zero-length array with flexible-array
        libata: Replace zero-length array with flexible-array
        kprobes: Replace zero-length array with flexible-array
        ...
      ffbc9376
    • Arvind Sankar's avatar
      x86/purgatory: Add -fno-stack-protector · ff58155c
      Arvind Sankar authored
      The purgatory Makefile removes -fstack-protector options if they were
      configured in, but does not currently add -fno-stack-protector.
      
      If gcc was configured with the --enable-default-ssp configure option,
      this results in the stack protector still being enabled for the
      purgatory (absent distro-specific specs files that might disable it
      again for freestanding compilations), if the main kernel is being
      compiled with stack protection enabled (if it's disabled for the main
      kernel, the top-level Makefile will add -fno-stack-protector).
      
      This will break the build since commit
        e4160b2e ("x86/purgatory: Fail the build if purgatory.ro has missing symbols")
      and prior to that would have caused runtime failure when trying to use
      kexec.
      
      Explicitly add -fno-stack-protector to avoid this, as done in other
      Makefiles that need to disable the stack protector.
      Reported-by: default avatarGabriel C <nix.or.die@googlemail.com>
      Signed-off-by: default avatarArvind Sankar <nivedita@alum.mit.edu>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      ff58155c
  3. 16 Jun, 2020 12 commits
    • David S. Miller's avatar
      Merge branch '1GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/net-queue · c9f66b43
      David S. Miller authored
      Jeff Kirsher says:
      
      ====================
      Intel Wired LAN Driver Updates 2020-06-16
      
      This series contains fixes to e1000 and e1000e.
      
      Chen fixes an e1000e issue where systems could be waken via WoL, even
      though the user has disabled the wakeup bit via sysfs.
      
      Vaibhav Gupta updates the e1000 driver to clean up the legacy Power
      Management hooks.
      
      Arnd Bergmann cleans up the inconsistent use CONFIG_PM_SLEEP
      preprocessor tags, which also resolves the compiler warnings about the
      possibility of unused structure.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c9f66b43
    • Arnd Bergmann's avatar
      e1000e: fix unused-function warning · 880e6269
      Arnd Bergmann authored
      The CONFIG_PM_SLEEP #ifdef checks in this file are inconsistent,
      leading to a warning about sometimes unused function:
      
      drivers/net/ethernet/intel/e1000e/netdev.c:137:13: error: unused function 'e1000e_check_me' [-Werror,-Wunused-function]
      
      Rather than adding more #ifdefs, just remove them completely
      and mark the PM functions as __maybe_unused to let the compiler
      work it out on it own.
      
      Fixes: e086ba2f ("e1000e: disable s0ix entry and exit flows for ME systems")
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Tested-by: default avatarAaron Brown <aaron.f.brown@intel.com>
      Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
      880e6269
    • Vaibhav Gupta's avatar
      e1000: use generic power management · eb6779d4
      Vaibhav Gupta authored
      With legacy PM hooks, it was the responsibility of a driver to manage PCI
      states and also the device's power state. The generic approach is to let PCI
      core handle the work.
      
      e1000_suspend() calls __e1000_shutdown() to perform intermediate tasks.
      __e1000_shutdown() modifies the value of "wake" (device should be wakeup
      enabled or not), responsible for controlling the flow of legacy PM.
      
      Since, PCI core has no idea about the value of "wake", new code for generic
      PM may produce unexpected results. Thus, use "device_set_wakeup_enable()"
      to wakeup-enable the device accordingly.
      Signed-off-by: default avatarVaibhav Gupta <vaibhavgupta40@gmail.com>
      Tested-by: default avatarAaron Brown <aaron.f.brown@intel.com>
      Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
      eb6779d4
    • Chen Yu's avatar
      e1000e: Do not wake up the system via WOL if device wakeup is disabled · 6bf6be11
      Chen Yu authored
      Currently the system will be woken up via WOL(Wake On LAN) even if the
      device wakeup ability has been disabled via sysfs:
       cat /sys/devices/pci0000:00/0000:00:1f.6/power/wakeup
       disabled
      
      The system should not be woken up if the user has explicitly
      disabled the wake up ability for this device.
      
      This patch clears the WOL ability of this network device if the
      user has disabled the wake up ability in sysfs.
      
      Fixes: bc7f75fa ("[E1000E]: New pci-express e1000 driver")
      Reported-by: default avatar"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
      Reviewed-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
      Cc: <Stable@vger.kernel.org>
      Signed-off-by: default avatarChen Yu <yu.c.chen@intel.com>
      Tested-by: default avatarAaron Brown <aaron.f.brown@intel.com>
      Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
      6bf6be11
    • Tim Harvey's avatar
      lan743x: add MODULE_DEVICE_TABLE for module loading alias · ea12fe9d
      Tim Harvey authored
      Without a MODULE_DEVICE_TABLE the attributes are missing that create
      an alias for auto-loading the module in userspace via hotplug.
      Signed-off-by: default avatarTim Harvey <tharvey@gateworks.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      ea12fe9d
    • David Howells's avatar
      afs: Fix silly rename · b6489a49
      David Howells authored
      Fix AFS's silly rename by the following means:
      
       (1) Set the destination directory in afs_do_silly_rename() so as to avoid
           misbehaviour and indicate that the directory data version will
           increment by 1 so as to avoid warnings about unexpected changes in the
           DV.  Also indicate that the ctime should be updated to avoid xfstest
           grumbling.
      
       (2) Note when the server indicates that a directory changed more than we
           expected (AFS_OPERATION_DIR_CONFLICT), indicating a conflict with a
           third party change, checking on successful completion of unlink and
           rename.
      
           The problem is that the FS.RemoveFile RPC op doesn't report the status
           of the unlinked file, though YFS.RemoveFile2 does.  This can be
           mitigated by the assumption that if the directory DV cranked by
           exactly 1, we can be sure we removed one link from the file; further,
           ordinarily in AFS, files cannot be hardlinked across directories, so
           if we reduce nlink to 0, the file is deleted.
      
           However, if the directory DV jumps by more than 1, we cannot know if a
           third party intervened by adding or removing a link on the file we
           just removed a link from.
      
           The same also goes for any vnode that is at the destination of the
           FS.Rename RPC op.
      
       (3) Make afs_vnode_commit_status() apply the nlink drop inside the cb_lock
           section along with the other attribute updates if ->op_unlinked is set
           on the descriptor for the appropriate vnode.
      
       (4) Issue a follow up status fetch to the unlinked file in the event of a
           third party conflict that makes it impossible for us to know if we
           actually deleted the file or not.
      
       (5) Provide a flag, AFS_VNODE_SILLY_DELETED, to make afs_getattr() lie to
           the user about the nlink of a silly deleted file so that it appears as
           0, not 1.
      
      Found with the generic/035 and generic/084 xfstests.
      
      Fixes: e49c7b2f ("afs: Build an abstraction around an "operation" concept")
      Reported-by: default avatarMarc Dionne <marc.dionne@auristor.com>
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      b6489a49
    • Ido Schimmel's avatar
      mlxsw: spectrum: Adjust headroom buffers for 8x ports · 60833d54
      Ido Schimmel authored
      The port's headroom buffers are used to store packets while they
      traverse the device's pipeline and also to store packets that are egress
      mirrored.
      
      On Spectrum-3, ports with eight lanes use two headroom buffers between
      which the configured headroom size is split.
      
      In order to prevent packet loss, multiply the calculated headroom size
      by two for 8x ports.
      
      Fixes: da382875 ("mlxsw: spectrum: Extend to support Spectrum-3 ASIC")
      Signed-off-by: default avatarIdo Schimmel <idosch@mellanox.com>
      Reviewed-by: default avatarJiri Pirko <jiri@mellanox.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      60833d54
    • Martin's avatar
      bareudp: Fixed configuration to avoid having garbage values · b15bb881
      Martin authored
      Code to initialize the conf structure while gathering the configuration
      of the device was missing.
      
      Fixes: 571912c6 ("net: UDP tunnel encapsulation module for tunnelling different protocols like MPLS, IP, NSH etc.")
      Signed-off-by: default avatarMartin <martin.varghese@nokia.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      b15bb881
    • Sven Auhagen's avatar
      mvpp2: remove module bugfix · 807eaf99
      Sven Auhagen authored
      The remove function does not destroy all
      BM Pools when per cpu pool is active.
      
      When reloading the mvpp2 as a module the BM Pools
      are still active in hardware and due to the bug
      have twice the size now old + new.
      
      This eventually leads to a kernel crash.
      
      v2:
      * add Fixes tag
      
      Fixes: 7d04b0b1 ("mvpp2: percpu buffers")
      Signed-off-by: default avatarSven Auhagen <sven.auhagen@voleatech.de>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      807eaf99
    • Eric Dumazet's avatar
      tcp: grow window for OOO packets only for SACK flows · 66205121
      Eric Dumazet authored
      Back in 2013, we made a change that broke fast retransmit
      for non SACK flows.
      
      Indeed, for these flows, a sender needs to receive three duplicate
      ACK before starting fast retransmit. Sending ACK with different
      receive window do not count.
      
      Even if enabling SACK is strongly recommended these days,
      there still are some cases where it has to be disabled.
      
      Not increasing the window seems better than having to
      rely on RTO.
      
      After the fix, following packetdrill test gives :
      
      // Initialize connection
          0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
         +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
         +0 bind(3, ..., ...) = 0
         +0 listen(3, 1) = 0
      
         +0 < S 0:0(0) win 32792 <mss 1000,nop,wscale 7>
         +0 > S. 0:0(0) ack 1 <mss 1460,nop,wscale 8>
         +0 < . 1:1(0) ack 1 win 514
      
         +0 accept(3, ..., ...) = 4
      
         +0 < . 1:1001(1000) ack 1 win 514
      // Quick ack
         +0 > . 1:1(0) ack 1001 win 264
      
         +0 < . 2001:3001(1000) ack 1 win 514
      // DUPACK : Normally we should not change the window
         +0 > . 1:1(0) ack 1001 win 264
      
         +0 < . 3001:4001(1000) ack 1 win 514
      // DUPACK : Normally we should not change the window
         +0 > . 1:1(0) ack 1001 win 264
      
         +0 < . 4001:5001(1000) ack 1 win 514
      // DUPACK : Normally we should not change the window
          +0 > . 1:1(0) ack 1001 win 264
      
         +0 < . 1001:2001(1000) ack 1 win 514
      // Hole is repaired.
         +0 > . 1:1(0) ack 5001 win 272
      
      Fixes: 4e4f1fc2 ("tcp: properly increase rcv_ssthresh for ofo packets")
      Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
      Reported-by: default avatarVenkat Venkatsubra <venkat.x.venkatsubra@oracle.com>
      Acked-by: default avatarNeal Cardwell <ncardwell@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      66205121
    • Linus Torvalds's avatar
      Merge tag 'mfd-fixes-5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd · 651220e2
      Linus Torvalds authored
      Pull MFD fix from Lee Jones:
       "Fix NULL pointer dereference in mt6360 driver"
      
      * tag 'mfd-fixes-5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd:
        mfd: mt6360: Fix register driver NULL pointer by adding driver name
      651220e2
    • David Howells's avatar
      afs: afs_vnode_commit_status() doesn't need to check the RPC error · 7c295eec
      David Howells authored
      afs_vnode_commit_status() is only ever called if op->error is 0, so remove
      the op->error checks from the function.
      
      Fixes: e49c7b2f ("afs: Build an abstraction around an "operation" concept")
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      7c295eec