1. 10 Sep, 2016 13 commits
    • David S. Miller's avatar
      Merge branch 'bpf-helper-cleanups' · 349aa334
      David S. Miller authored
      Daniel Borkmann says:
      
      ====================
      Some BPF helper cleanups
      
      This series contains a couple of misc cleanups and improvements
      for BPF helpers. For details please see individual patches. We
      let this also sit for a few days with Fengguang's kbuild test
      robot, and there were no issues seen (besides one false positive,
      see last one for details).
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      349aa334
    • Daniel Borkmann's avatar
      bpf: add BPF_CALL_x macros for declaring helpers · f3694e00
      Daniel Borkmann authored
      This work adds BPF_CALL_<n>() macros and converts all the eBPF helper functions
      to use them, in a similar fashion like we do with SYSCALL_DEFINE<n>() macros
      that are used today. Motivation for this is to hide all the register handling
      and all necessary casts from the user, so that it is done automatically in the
      background when adding a BPF_CALL_<n>() call.
      
      This makes current helpers easier to review, eases to write future helpers,
      avoids getting the casting mess wrong, and allows for extending all helpers at
      once (f.e. build time checks, etc). It also helps detecting more easily in
      code reviews that unused registers are not instrumented in the code by accident,
      breaking compatibility with existing programs.
      
      BPF_CALL_<n>() internals are quite similar to SYSCALL_DEFINE<n>() ones with some
      fundamental differences, for example, for generating the actual helper function
      that carries all u64 regs, we need to fill unused regs, so that we always end up
      with 5 u64 regs as an argument.
      
      I reviewed several 0-5 generated BPF_CALL_<n>() variants of the .i results and
      they look all as expected. No sparse issue spotted. We let this also sit for a
      few days with Fengguang's kbuild test robot, and there were no issues seen. On
      s390, it barked on the "uses dynamic stack allocation" notice, which is an old
      one from bpf_perf_event_output{,_tp}() reappearing here due to the conversion
      to the call wrapper, just telling that the perf raw record/frag sits on stack
      (gcc with s390's -mwarn-dynamicstack), but that's all. Did various runtime tests
      and they were fine as well. All eBPF helpers are now converted to use these
      macros, getting rid of a good chunk of all the raw castings.
      Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
      Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      f3694e00
    • Daniel Borkmann's avatar
      bpf: add own ctx rewriter on ifindex for clsact progs · 374fb54e
      Daniel Borkmann authored
      When fetching ifindex, we don't need to test dev for being NULL since
      we're always guaranteed to have a valid dev for clsact programs. Thus,
      avoid this test in fast path.
      Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
      Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      374fb54e
    • Daniel Borkmann's avatar
      bpf: add BPF_SIZEOF and BPF_FIELD_SIZEOF macros · f035a515
      Daniel Borkmann authored
      Add BPF_SIZEOF() and BPF_FIELD_SIZEOF() macros to improve the code a bit
      which otherwise often result in overly long bytes_to_bpf_size(sizeof())
      and bytes_to_bpf_size(FIELD_SIZEOF()) lines. So place them into a macro
      helper instead. Moreover, we currently have a BUILD_BUG_ON(BPF_FIELD_SIZEOF())
      check in convert_bpf_extensions(), but we should rather make that generic
      as well and add a BUILD_BUG_ON() test in all BPF_SIZEOF()/BPF_FIELD_SIZEOF()
      users to detect any rewriter size issues at compile time. Note, there are
      currently none, but we want to assert that it stays this way.
      Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
      Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      f035a515
    • Daniel Borkmann's avatar
      bpf: minor cleanups in helpers · 6088b582
      Daniel Borkmann authored
      Some minor misc cleanups, f.e. use sizeof(__u32) instead of hardcoding
      and in __bpf_skb_max_len(), I missed that we always have skb->dev valid
      anyway, so we can drop the unneeded test for dev; also few more other
      misc bits addressed here.
      Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
      Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      6088b582
    • Eric Dumazet's avatar
      ip_tunnel: do not clear l4 hashes · bf8d85d4
      Eric Dumazet authored
      If skb has a valid l4 hash, there is no point clearing hash and force
      a further flow dissection when a tunnel encapsulation is added.
      Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      bf8d85d4
    • Markus Elfring's avatar
      ATM-ForeRunnerHE: Use kmalloc_array() in he_init_group() · 2c4f414f
      Markus Elfring authored
      * Multiplications for the size determination of memory allocations
        indicated that array data structures should be processed.
        Thus use the corresponding function "kmalloc_array".
      
        This issue was detected by using the Coccinelle software.
      
      * Replace the specification of data types by pointer dereferences
        to make the corresponding size determination a bit safer according to
        the Linux coding style convention.
      Signed-off-by: default avatarMarkus Elfring <elfring@users.sourceforge.net>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      2c4f414f
    • Markus Elfring's avatar
      ATM-ENI: Use kmalloc_array() in eni_start() · d9e6620c
      Markus Elfring authored
      * A multiplication for the size determination of a memory allocation
        indicated that an array data structure should be processed.
        Thus use the corresponding function "kmalloc_array".
      
        This issue was detected by using the Coccinelle software.
      
      * Replace the specification of a data structure by a pointer dereference
        to make the corresponding size determination a bit safer according to
        the Linux coding style convention.
      Signed-off-by: default avatarMarkus Elfring <elfring@users.sourceforge.net>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      d9e6620c
    • David S. Miller's avatar
      Merge tag 'rxrpc-rewrite-20160908' of... · fa5f4aaf
      David S. Miller authored
      Merge tag 'rxrpc-rewrite-20160908' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs
      
      David Howells says:
      
      ====================
      rxrpc: Rewrite data and ack handling
      
      This patch set constitutes the main portion of the AF_RXRPC rewrite.  It
      consists of five fix/helper patches:
      
       (1) Fix ASSERTCMP's and ASSERTIFCMP's handling of signed values.
      
       (2) Update some protocol definitions slightly.
      
       (3) Use of an hlist for RCU purposes.
      
       (4) Removal of per-call sk_buff accounting (not really needed when skbs
           aren't being queued on the main queue).
      
       (5) Addition of a tracepoint to log incoming packets in the data_ready
           callback and to log the end of the data_ready callback.
      
      And then there are two patches that form the main part:
      
       (6) Preallocation of resources for incoming calls so that in patch (7) the
           data_ready handler can be made to fully instantiate an incoming call
           and make it live.  This extends through into AFS so that AFS can
           preallocate its own incoming call resources.
      
           The preallocation size is capped at the listen() backlog setting - and
           that is capped at a sysctl limit which can be set between 4 and 32.
      
           The preallocation is (re)charged either by accepting/rejecting pending
           calls or, in the case of AFS, manually.  If insufficient preallocation
           resources exist, a BUSY packet will be transmitted.
      
           The advantage of using this preallocation is that once a call is set
           up in the data_ready handler, DATA packets can be queued on it
           immediately rather than the DATA packets being queued for a background
           work item to do all the allocation and then try and sort out the DATA
           packets whilst other DATA packets may still be coming in and going
           either to the background thread or the new call.
      
       (7) Rewrite the handling of DATA, ACK and ABORT packets.
      
           In the receive phase, DATA packets are now held in per-call circular
           buffers with deduplication, out of sequence detection and suchlike
           being done in data_ready.  Since there is only one producer and only
           once consumer, no locks need be used on the receive queue.
      
           Received ACK and ABORT packets are now parsed and discarded in
           data_ready to recycle resources as fast as possible.
      
           sk_buffs are no longer pulled, trimmed or cloned, but rather the
           offset and size of the content is tracked.  This particularly affects
           jumbo DATA packets which need insertion into the receive buffer in
           multiple places.  Annotations are kept to track which bit is which.
      
           Packets are no longer queued on the socket receive queue; rather,
           calls are queued.  Dummy packets to convey events therefore no longer
           need to be invented and metadata packets can be discarded as soon as
           parsed rather then being pushed onto the socket receive queue to
           indicate terminal events.
      
           The preallocation facility added in (6) is now used to set up incoming
           calls with very little locking required and no calls to the allocator
           in data_ready.
      
           Decryption and verification is now handled in recvmsg() rather than in
           a background thread.  This allows for the future possibility of
           decrypting directly into the user buffer.
      
           With this patch, the code is a lot simpler and most of the mass of
           call event and state wangling code in call_event.c is gone.
      
      With this, the majority of the AF_RXRPC rewrite is complete.  However,
      there are still things to be done, including:
      
       (*) Limit the number of active service calls to prevent an attacker from
           filling up a server's memory.
      
       (*) Limit the number of calls on the rebuff-with-BUSY queue.
      
       (*) Transmit delayed/deferred ACKs from recvmsg() if possible, rather than
           punting to the background thread.  Ideally, the background thread
           shouldn't run at all, but data_ready can't call kernel_sendmsg() and
           we can't rely on recvmsg() attending to the call in a timely fashion.
      
       (*) Prevent the call at the front of the socket queue from hogging
           recvmsg()'s attention if there's a sufficiently continuous supply of
           data.
      
       (*) Distribute ICMP errors by connection rather than by call.  Possibly
           parse the ICMP packet to try and pin down the exact connection and
           call.
      
       (*) Encrypt/decrypt directly between user buffers and socket buffers where
           possible.
      
       (*) IPv6.
      
       (*) Service ID upgrade.  This is a facility whereby a special flag bit is
           set in the DATA packet header when making a call that tells the server
           that it is allowed to change the service ID to an upgraded one and
           reply with an equivalent call from the upgraded service.
      
           This is used, for example, to override certain AFS calls so that IPv6
           addresses can be returned.
      
       (*) Allow userspace to preallocate call user IDs for incoming calls.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      fa5f4aaf
    • Colin Ian King's avatar
      via-velocity: remove null pointer check on array tdinfo->skb_dma · 46dfc23e
      Colin Ian King authored
      tdinfo->skb_dma is a 7 element array of dma_addr_t hence cannot be
      null, so the pull pointer check on tdinfo->skb_dma  is redundant.
      Remove it.
      Signed-off-by: default avatarColin Ian King <colin.king@canonical.com>
      Acked-by: default avatarFrancois Romieu <romieu@fr.zoreil.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      46dfc23e
    • Baoyou Xie's avatar
      qede: mark qede_set_features() static · 9438451e
      Baoyou Xie authored
      We get 1 warning when building kernel with W=1:
      drivers/net/ethernet/qlogic/qede/qede_main.c:2113:5: warning: no previous prototype for 'qede_set_features' [-Wmissing-prototypes]
      
      In fact, this function is only used in the file in which it is
      declared and don't need a declaration, but can be made static.
      so this patch marks this function with 'static'.
      Signed-off-by: default avatarBaoyou Xie <baoyou.xie@linaro.org>
      Acked-by: default avatarYuval Mintz <Yuval.Mintz@qlogic.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      9438451e
    • Raju Lakkaraju's avatar
      net: phy: Fixed checkpatch errors for Microsemi PHYs. · 4ffd03f5
      Raju Lakkaraju authored
      The existing VSC85xx PHY driver did not follow the coding style and caused "checkpatch" to complain. This commit fixes this.
      Signed-off-by: default avatarRaju Lakkaraju <Raju.Lakkaraju@microsemi.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      4ffd03f5
    • Colin Ian King's avatar
      net: x25: remove null checks on arrays calling_ae and called_ae · 05f1b12f
      Colin Ian King authored
      dtefacs.calling_ae and called_ae are both 20 element __u8 arrays and
      cannot be null and hence are redundant checks. Remove these.
      Signed-off-by: default avatarColin Ian King <colin.king@canonical.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      05f1b12f
  2. 09 Sep, 2016 12 commits
    • stephen hemminger's avatar
      macsec: set network devtype · c24acf03
      stephen hemminger authored
      The netdevice type structure for macsec was being defined but never used.
      To set the network device type the macro SET_NETDEV_DEVTYPE must be called.
      Compile tested only, I don't use macsec.
      Signed-off-by: default avatarStephen Hemminger <stephen@networkplumber.org>
      Acked-by: default avatarSabrina Dubroca <sd@queasysnail.net>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c24acf03
    • stephen hemminger's avatar
      rtnetlink: remove unused ifla_stats_policy · b8b867e1
      stephen hemminger authored
      This structure is defined but never used. Flagged with W=1
      Signed-off-by: default avatarStephen Hemminger <stephen@networkplumber.org>
      Acked-by: default avatarRoopa Prabhu <roopa@cumulusnetworks.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      b8b867e1
    • David S. Miller's avatar
      Merge branch 'newroute-creation-flags' · a349fcc8
      David S. Miller authored
      Guillaume Nault says:
      
      ====================
      ip: fix creation flags reported in RTM_NEWROUTE events
      
      Netlink messages sent to user-space upon RTM_NEWROUTE events have their
      nlmsg_flags field inconsistently set. While the NLM_F_REPLACE and
      NLM_F_APPEND bits are correctly handled, NLM_F_CREATE and NLM_F_EXCL
      are always 0.
      
      This series sets the NLM_F_CREATE and NLM_F_EXCL bits when applicable,
      for IPv4 and IPv6.
      
      Since IPv6 ignores the NLM_F_APPEND flags in requests, this flag isn't
      reported in RTM_NEWROUTE IPv6 events. This keeps IPv6 internal
      consistency (same flag semantic for user requests and kernel events) at
      the cost of bringing different flag interpretation for IPv4 and IPv6.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      a349fcc8
    • Guillaume Nault's avatar
      ipv6: report NLM_F_CREATE and NLM_F_EXCL flags in RTM_NEWROUTE events · 73483c12
      Guillaume Nault authored
      Since commit 37a1d361 ("ipv6: include NLM_F_REPLACE in route
      replace notifications"), RTM_NEWROUTE notifications have their
      NLM_F_REPLACE flag set if the new route replaced a preexisting one.
      However, other flags aren't set.
      
      This patch reports the missing NLM_F_CREATE and NLM_F_EXCL flag bits.
      
      NLM_F_APPEND is not reported, because in ipv6 a NLM_F_CREATE request
      is interpreted as an append request (contrary to ipv4, "prepend" is not
      supported, so if NLM_F_EXCL is not set then NLM_F_APPEND is implicit).
      
      As a result, the possible flag combination can now be reported
      (iproute2's terminology into parentheses):
      
        * NLM_F_CREATE | NLM_F_EXCL: route didn't exist, exclusive creation
          ("add").
        * NLM_F_CREATE: route did already exist, new route added after
          preexisting ones ("append").
        * NLM_F_REPLACE: route did already exist, new route replaced the
          first preexisting one ("change").
      Signed-off-by: default avatarGuillaume Nault <g.nault@alphalink.fr>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      73483c12
    • Guillaume Nault's avatar
      ipv4: fix value of ->nlmsg_flags reported in RTM_NEWROUTE events · b93e1fa7
      Guillaume Nault authored
      fib_table_insert() inconsistently fills the nlmsg_flags field in its
      notification messages.
      
      Since commit b8f55831 ("[RTNETLINK]: Fix sending netlink message
      when replace route."), the netlink message has its nlmsg_flags set to
      NLM_F_REPLACE if the route replaced a preexisting one.
      
      Then commit a2bb6d7d ("ipv4: include NLM_F_APPEND flag in append
      route notifications") started setting nlmsg_flags to NLM_F_APPEND if
      the route matched a preexisting one but was appended.
      
      In other cases (exclusive creation or prepend), nlmsg_flags is 0.
      
      This patch sets ->nlmsg_flags in all situations, preserving the
      semantic of the NLM_F_* bits:
      
        * NLM_F_CREATE: a new fib entry has been created for this route.
        * NLM_F_EXCL: no other fib entry existed for this route.
        * NLM_F_REPLACE: this route has overwritten a preexisting fib entry.
        * NLM_F_APPEND: the new fib entry was added after other entries for
          the same route.
      
      As a result, the possible flag combination can now be reported
      (iproute2's terminology into parentheses):
      
        * NLM_F_CREATE | NLM_F_EXCL: route didn't exist, exclusive creation
          ("add").
        * NLM_F_CREATE | NLM_F_APPEND: route did already exist, new route
          added after preexisting ones ("append").
        * NLM_F_CREATE: route did already exist, new route added before
          preexisting ones ("prepend").
        * NLM_F_REPLACE: route did already exist, new route replaced the
          first preexisting one ("change").
      Signed-off-by: default avatarGuillaume Nault <g.nault@alphalink.fr>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      b93e1fa7
    • Eric Dumazet's avatar
      ipv4: accept u8 in IP_TOS ancillary data · e895cdce
      Eric Dumazet authored
      In commit f02db315 ("ipv4: IP_TOS and IP_TTL can be specified as
      ancillary data") Francesco added IP_TOS values specified as integer.
      
      However, kernel sends to userspace (at recvmsg() time) an IP_TOS value
      in a single byte, when IP_RECVTOS is set on the socket.
      
      It can be very useful to reflect all ancillary options as given by the
      kernel in a subsequent sendmsg(), instead of aborting the sendmsg() with
      EINVAL after Francesco patch.
      
      So this patch extends IP_TOS ancillary to accept an u8, so that an UDP
      server can simply reuse same ancillary block without having to mangle
      it.
      
      Jesper can then augment
      https://github.com/netoptimizer/network-testing/blob/master/src/udp_example02.c
      to add TOS reflection ;)
      
      Fixes: f02db315 ("ipv4: IP_TOS and IP_TTL can be specified as ancillary data")
      Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
      Cc: Francesco Fusco <ffusco@redhat.com>
      Cc: Jesper Dangaard Brouer <brouer@redhat.com>
      Acked-by: default avatarJesper Dangaard Brouer <brouer@redhat.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e895cdce
    • Daniel Borkmann's avatar
      bpf: fix range propagation on direct packet access · 2d2be8ca
      Daniel Borkmann authored
      LLVM can generate code that tests for direct packet access via
      skb->data/data_end in a way that currently gets rejected by the
      verifier, example:
      
        [...]
         7: (61) r3 = *(u32 *)(r6 +80)
         8: (61) r9 = *(u32 *)(r6 +76)
         9: (bf) r2 = r9
        10: (07) r2 += 54
        11: (3d) if r3 >= r2 goto pc+12
         R1=inv R2=pkt(id=0,off=54,r=0) R3=pkt_end R4=inv R6=ctx
         R9=pkt(id=0,off=0,r=0) R10=fp
        12: (18) r4 = 0xffffff7a
        14: (05) goto pc+430
        [...]
      
        from 11 to 24: R1=inv R2=pkt(id=0,off=54,r=0) R3=pkt_end R4=inv
                       R6=ctx R9=pkt(id=0,off=0,r=0) R10=fp
        24: (7b) *(u64 *)(r10 -40) = r1
        25: (b7) r1 = 0
        26: (63) *(u32 *)(r6 +56) = r1
        27: (b7) r2 = 40
        28: (71) r8 = *(u8 *)(r9 +20)
        invalid access to packet, off=20 size=1, R9(id=0,off=0,r=0)
      
      The reason why this gets rejected despite a proper test is that we
      currently call find_good_pkt_pointers() only in case where we detect
      tests like rX > pkt_end, where rX is of type pkt(id=Y,off=Z,r=0) and
      derived, for example, from a register of type pkt(id=Y,off=0,r=0)
      pointing to skb->data. find_good_pkt_pointers() then fills the range
      in the current branch to pkt(id=Y,off=0,r=Z) on success.
      
      For above case, we need to extend that to recognize pkt_end >= rX
      pattern and mark the other branch that is taken on success with the
      appropriate pkt(id=Y,off=0,r=Z) type via find_good_pkt_pointers().
      Since eBPF operates on BPF_JGT (>) and BPF_JGE (>=), these are the
      only two practical options to test for from what LLVM could have
      generated, since there's no such thing as BPF_JLT (<) or BPF_JLE (<=)
      that we would need to take into account as well.
      
      After the fix:
      
        [...]
         7: (61) r3 = *(u32 *)(r6 +80)
         8: (61) r9 = *(u32 *)(r6 +76)
         9: (bf) r2 = r9
        10: (07) r2 += 54
        11: (3d) if r3 >= r2 goto pc+12
         R1=inv R2=pkt(id=0,off=54,r=0) R3=pkt_end R4=inv R6=ctx
         R9=pkt(id=0,off=0,r=0) R10=fp
        12: (18) r4 = 0xffffff7a
        14: (05) goto pc+430
        [...]
      
        from 11 to 24: R1=inv R2=pkt(id=0,off=54,r=54) R3=pkt_end R4=inv
                       R6=ctx R9=pkt(id=0,off=0,r=54) R10=fp
        24: (7b) *(u64 *)(r10 -40) = r1
        25: (b7) r1 = 0
        26: (63) *(u32 *)(r6 +56) = r1
        27: (b7) r2 = 40
        28: (71) r8 = *(u8 *)(r9 +20)
        29: (bf) r1 = r8
        30: (25) if r8 > 0x3c goto pc+47
         R1=inv56 R2=imm40 R3=pkt_end R4=inv R6=ctx R8=inv56
         R9=pkt(id=0,off=0,r=54) R10=fp
        31: (b7) r1 = 1
        [...]
      
      Verifier test cases are also added in this work, one that demonstrates
      the mentioned example here and one that tries a bad packet access for
      the current/fall-through branch (the one with types pkt(id=X,off=Y,r=0),
      pkt(id=X,off=0,r=0)), then a case with good and bad accesses, and two
      with both test variants (>, >=).
      
      Fixes: 969bf05e ("bpf: direct packet access")
      Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
      Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      2d2be8ca
    • Yaogong Wang's avatar
      tcp: use an RB tree for ooo receive queue · 9f5afeae
      Yaogong Wang authored
      Over the years, TCP BDP has increased by several orders of magnitude,
      and some people are considering to reach the 2 Gbytes limit.
      
      Even with current window scale limit of 14, ~1 Gbytes maps to ~740,000
      MSS.
      
      In presence of packet losses (or reorders), TCP stores incoming packets
      into an out of order queue, and number of skbs sitting there waiting for
      the missing packets to be received can be in the 10^5 range.
      
      Most packets are appended to the tail of this queue, and when
      packets can finally be transferred to receive queue, we scan the queue
      from its head.
      
      However, in presence of heavy losses, we might have to find an arbitrary
      point in this queue, involving a linear scan for every incoming packet,
      throwing away cpu caches.
      
      This patch converts it to a RB tree, to get bounded latencies.
      
      Yaogong wrote a preliminary patch about 2 years ago.
      Eric did the rebase, added ofo_last_skb cache, polishing and tests.
      
      Tested with network dropping between 1 and 10 % packets, with good
      success (about 30 % increase of throughput in stress tests)
      
      Next step would be to also use an RB tree for the write queue at sender
      side ;)
      Signed-off-by: default avatarYaogong Wang <wygivan@google.com>
      Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
      Cc: Yuchung Cheng <ycheng@google.com>
      Cc: Neal Cardwell <ncardwell@google.com>
      Cc: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
      Acked-By: default avatarIlpo Järvinen <ilpo.jarvinen@helsinki.fi>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      9f5afeae
    • David S. Miller's avatar
      Merge branch 'ovs-802.1ad' · 3b61075b
      David S. Miller authored
      Eric Garver says:
      
      ====================
      openvswitch: add 802.1ad support
      
      This series adds 802.1ad support to openvswitch. It is a continuation of the
      work originally started by Thomas F Herbert - hence the large rev number.
      
      The extra VLAN is implemented by using an additional level of the
      OVS_KEY_ATTR_ENCAP netlink attribute.
      In OVS flow speak, this looks like
      
         eth_type(0x88a8),vlan(vid=100),encap(eth_type(0x8100), vlan(vid=200),
                                              encap(eth_type(0x0800), ...))
      
      The userspace counterpart has also seen recent activity on the ovs-dev mailing
      lists. There are some new 802.1ad OVS tests being added - also on the ovs-dev
      list. This patch series has been tested using the most recent version of
      userspace (v3) and tests (v2).
      
      v22 changes:
        - merge patch 4 into patch 3
        - fix checkpatch.pl errors
          - Still some 80 char warnings for long string literals
        - refresh pointer after pskb_may_pull()
        - refactor vlan nlattr parsing to remove some double checks
        - introduce ovs_nla_put_vlan()
        - move triple VLAN check to after ethertype serialization
        - WARN_ON_ONCE() on triple VLAN and unexpected encap values
      
      v21 changes:
        - Fix (and simplify) netlink attribute parsing
        - re-add handling of truncated VLAN tags
        - fix if/else dangling assignment in {push,pop}_vlan()
        - simplify parse_vlan()
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      3b61075b
    • Eric Garver's avatar
      openvswitch: 802.1AD Flow handling, actions, vlan parsing, netlink attributes · 018c1dda
      Eric Garver authored
      Add support for 802.1ad including the ability to push and pop double
      tagged vlans. Add support for 802.1ad to netlink parsing and flow
      conversion. Uses double nested encap attributes to represent double
      tagged vlan. Inner TPID encoded along with ctci in nested attributes.
      
      This is based on Thomas F Herbert's original v20 patch. I made some
      small clean ups and bug fixes.
      Signed-off-by: default avatarThomas F Herbert <thomasfherbert@gmail.com>
      Signed-off-by: default avatarEric Garver <e@erig.me>
      Acked-by: default avatarPravin B Shelar <pshelar@ovn.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      018c1dda
    • Eric Garver's avatar
      vlan: Check for vlan ethernet types for 8021.q or 802.1ad · fe19c4f9
      Eric Garver authored
      This is to simplify using double tagged vlans. This function allows all
      valid vlan ethertypes to be checked in a single function call.
      Also replace some instances that check for both ETH_P_8021Q and
      ETH_P_8021AD.
      
      Patch based on one originally by Thomas F Herbert.
      Signed-off-by: default avatarThomas F Herbert <thomasfherbert@gmail.com>
      Signed-off-by: default avatarEric Garver <e@erig.me>
      Acked-by: default avatarPravin B Shelar <pshelar@ovn.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      fe19c4f9
    • Thomas F Herbert's avatar
      openvswitch: 802.1ad uapi changes. · 8c146bb9
      Thomas F Herbert authored
      openvswitch: Add support for 8021.AD
      
      Change the description of the VLAN tpid field.
      Signed-off-by: default avatarThomas F Herbert <thomasfherbert@gmail.com>
      Acked-by: default avatarPravin B Shelar <pshelar@ovn.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      8c146bb9
  3. 08 Sep, 2016 15 commits
    • Lorenzo Colitti's avatar
      net: inet: diag: expose the socket mark to privileged processes. · d545caca
      Lorenzo Colitti authored
      This adds the capability for a process that has CAP_NET_ADMIN on
      a socket to see the socket mark in socket dumps.
      
      Commit a52e95ab ("net: diag: allow socket bytecode filters to
      match socket marks") recently gave privileged processes the
      ability to filter socket dumps based on mark. This patch is
      complementary: it ensures that the mark is also passed to
      userspace in the socket's netlink attributes.  It is useful for
      tools like ss which display information about sockets.
      
      Tested: https://android-review.googlesource.com/270210Signed-off-by: default avatarLorenzo Colitti <lorenzo@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      d545caca
    • Zubair Lutfullah Kakakhel's avatar
      net: ethernet: xilinx: Enable emaclite for MIPS · 74f13c80
      Zubair Lutfullah Kakakhel authored
      The MIPS based xilfpga platform uses this driver.
      Enable it for MIPS
      Signed-off-by: default avatarZubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      74f13c80
    • David S. Miller's avatar
      Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next · 575f9c43
      David S. Miller authored
      Steffen Klassert says:
      
      ====================
      ipsec-next 2016-09-08
      
      1) Constify the xfrm_replay structures. From Julia Lawall
      
      2) Protect xfrm state hash tables with rcu, lookups
         can be done now without acquiring xfrm_state_lock.
         From Florian Westphal.
      
      3) Protect xfrm policy hash tables with rcu, lookups
         can be done now without acquiring xfrm_policy_lock.
         From Florian Westphal.
      
      4) We don't need to have a garbage collector list per
         namespace anymore, so use a global one instead.
         From Florian Westphal.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      575f9c43
    • David Howells's avatar
      rxrpc: Rewrite the data and ack handling code · 248f219c
      David Howells authored
      Rewrite the data and ack handling code such that:
      
       (1) Parsing of received ACK and ABORT packets and the distribution and the
           filing of DATA packets happens entirely within the data_ready context
           called from the UDP socket.  This allows us to process and discard ACK
           and ABORT packets much more quickly (they're no longer stashed on a
           queue for a background thread to process).
      
       (2) We avoid calling skb_clone(), pskb_pull() and pskb_trim().  We instead
           keep track of the offset and length of the content of each packet in
           the sk_buff metadata.  This means we don't do any allocation in the
           receive path.
      
       (3) Jumbo DATA packet parsing is now done in data_ready context.  Rather
           than cloning the packet once for each subpacket and pulling/trimming
           it, we file the packet multiple times with an annotation for each
           indicating which subpacket is there.  From that we can directly
           calculate the offset and length.
      
       (4) A call's receive queue can be accessed without taking locks (memory
           barriers do have to be used, though).
      
       (5) Incoming calls are set up from preallocated resources and immediately
           made live.  They can than have packets queued upon them and ACKs
           generated.  If insufficient resources exist, DATA packet #1 is given a
           BUSY reply and other DATA packets are discarded).
      
       (6) sk_buffs no longer take a ref on their parent call.
      
      To make this work, the following changes are made:
      
       (1) Each call's receive buffer is now a circular buffer of sk_buff
           pointers (rxtx_buffer) rather than a number of sk_buff_heads spread
           between the call and the socket.  This permits each sk_buff to be in
           the buffer multiple times.  The receive buffer is reused for the
           transmit buffer.
      
       (2) A circular buffer of annotations (rxtx_annotations) is kept parallel
           to the data buffer.  Transmission phase annotations indicate whether a
           buffered packet has been ACK'd or not and whether it needs
           retransmission.
      
           Receive phase annotations indicate whether a slot holds a whole packet
           or a jumbo subpacket and, if the latter, which subpacket.  They also
           note whether the packet has been decrypted in place.
      
       (3) DATA packet window tracking is much simplified.  Each phase has just
           two numbers representing the window (rx_hard_ack/rx_top and
           tx_hard_ack/tx_top).
      
           The hard_ack number is the sequence number before base of the window,
           representing the last packet the other side says it has consumed.
           hard_ack starts from 0 and the first packet is sequence number 1.
      
           The top number is the sequence number of the highest-numbered packet
           residing in the buffer.  Packets between hard_ack+1 and top are
           soft-ACK'd to indicate they've been received, but not yet consumed.
      
           Four macros, before(), before_eq(), after() and after_eq() are added
           to compare sequence numbers within the window.  This allows for the
           top of the window to wrap when the hard-ack sequence number gets close
           to the limit.
      
           Two flags, RXRPC_CALL_RX_LAST and RXRPC_CALL_TX_LAST, are added also
           to indicate when rx_top and tx_top point at the packets with the
           LAST_PACKET bit set, indicating the end of the phase.
      
       (4) Calls are queued on the socket 'receive queue' rather than packets.
           This means that we don't need have to invent dummy packets to queue to
           indicate abnormal/terminal states and we don't have to keep metadata
           packets (such as ABORTs) around
      
       (5) The offset and length of a (sub)packet's content are now passed to
           the verify_packet security op.  This is currently expected to decrypt
           the packet in place and validate it.
      
           However, there's now nowhere to store the revised offset and length of
           the actual data within the decrypted blob (there may be a header and
           padding to skip) because an sk_buff may represent multiple packets, so
           a locate_data security op is added to retrieve these details from the
           sk_buff content when needed.
      
       (6) recvmsg() now has to handle jumbo subpackets, where each subpacket is
           individually secured and needs to be individually decrypted.  The code
           to do this is broken out into rxrpc_recvmsg_data() and shared with the
           kernel API.  It now iterates over the call's receive buffer rather
           than walking the socket receive queue.
      
      Additional changes:
      
       (1) The timers are condensed to a single timer that is set for the soonest
           of three timeouts (delayed ACK generation, DATA retransmission and
           call lifespan).
      
       (2) Transmission of ACK and ABORT packets is effected immediately from
           process-context socket ops/kernel API calls that cause them instead of
           them being punted off to a background work item.  The data_ready
           handler still has to defer to the background, though.
      
       (3) A shutdown op is added to the AF_RXRPC socket so that the AFS
           filesystem can shut down the socket and flush its own work items
           before closing the socket to deal with any in-progress service calls.
      
      Future additional changes that will need to be considered:
      
       (1) Make sure that a call doesn't hog the front of the queue by receiving
           data from the network as fast as userspace is consuming it to the
           exclusion of other calls.
      
       (2) Transmit delayed ACKs from within recvmsg() when we've consumed
           sufficiently more packets to avoid the background work item needing to
           run.
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      248f219c
    • David Howells's avatar
      rxrpc: Preallocate peers, conns and calls for incoming service requests · 00e90712
      David Howells authored
      Make it possible for the data_ready handler called from the UDP transport
      socket to completely instantiate an rxrpc_call structure and make it
      immediately live by preallocating all the memory it might need.  The idea
      is to cut out the background thread usage as much as possible.
      
      [Note that the preallocated structs are not actually used in this patch -
       that will be done in a future patch.]
      
      If insufficient resources are available in the preallocation buffers, it
      will be possible to discard the DATA packet in the data_ready handler or
      schedule a BUSY packet without the need to schedule an attempt at
      allocation in a background thread.
      
      To this end:
      
       (1) Preallocate rxrpc_peer, rxrpc_connection and rxrpc_call structs to a
           maximum number each of the listen backlog size.  The backlog size is
           limited to a maxmimum of 32.  Only this many of each can be in the
           preallocation buffer.
      
       (2) For userspace sockets, the preallocation is charged initially by
           listen() and will be recharged by accepting or rejecting pending
           new incoming calls.
      
       (3) For kernel services {,re,dis}charging of the preallocation buffers is
           handled manually.  Two notifier callbacks have to be provided before
           kernel_listen() is invoked:
      
           (a) An indication that a new call has been instantiated.  This can be
           	 used to trigger background recharging.
      
           (b) An indication that a call is being discarded.  This is used when
           	 the socket is being released.
      
           A function, rxrpc_kernel_charge_accept() is called by the kernel
           service to preallocate a single call.  It should be passed the user ID
           to be used for that call and a callback to associate the rxrpc call
           with the kernel service's side of the ID.
      
       (4) Discard the preallocation when the socket is closed.
      
       (5) Temporarily bump the refcount on the call allocated in
           rxrpc_incoming_call() so that rxrpc_release_call() can ditch the
           preallocation ref on service calls unconditionally.  This will no
           longer be necessary once the preallocation is used.
      
      Note that this does not yet control the number of active service calls on a
      client - that will come in a later patch.
      
      A future development would be to provide a setsockopt() call that allows a
      userspace server to manually charge the preallocation buffer.  This would
      allow user call IDs to be provided in advance and the awkward manual accept
      stage to be bypassed.
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      00e90712
    • David Howells's avatar
      rxrpc: Add tracepoints to record received packets and end of data_ready · 49e19ec7
      David Howells authored
      Add two tracepoints:
      
       (1) Record the RxRPC protocol header of packets retrieved from the UDP
           socket by the data_ready handler.
      
       (2) Record the outcome of the data_ready handler.
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      49e19ec7
    • David Howells's avatar
      rxrpc: Remove skb_count from struct rxrpc_call · 2ab27215
      David Howells authored
      Remove the sk_buff count from the rxrpc_call struct as it's less useful
      once we stop queueing sk_buffs.
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      2ab27215
    • David Howells's avatar
      rxrpc: Convert rxrpc_local::services to an hlist · de8d6c74
      David Howells authored
      Convert the rxrpc_local::services list to an hlist so that it can be
      accessed under RCU conditions more readily.
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      de8d6c74
    • David Howells's avatar
      rxrpc: Update protocol definitions slightly · 18f1387c
      David Howells authored
      Update the protocol definitions in include/rxrpc/packet.h slightly:
      
       (1) Get rid of RXRPC_PROCESS_MAXCALLS as it's redundant (same as
           RXRPC_MAXCALLS).
      
       (2) In struct rxrpc_jumbo_header, put _rsvd in a union with a field called
           cksum to match struct rxrpc_wire_header.
      
       (3) Provide RXRPC_JUMBO_SUBPKTLEN which is the total of the amount of data
           in a non-terminal subpacket plus the following secondary header for
           the next packet included in the jumbo packet.
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      18f1387c
    • David Howells's avatar
      rxrpc: Fix ASSERTCMP and ASSERTIFCMP to handle signed values · cf13258f
      David Howells authored
      Fix ASSERTCMP and ASSERTIFCMP to be able to handle signed values by casting
      both parameters to the type of the first before comparing.  Without this,
      both values are cast to unsigned long, which means that checks for values
      less than zero don't work.
      
      The downside of this is that the state enum values in struct rxrpc_call and
      struct rxrpc_connection can't be bitfields as __typeof__ can't handle them.
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      cf13258f
    • subashab@codeaurora.org's avatar
      net: xfrm: Change u32 sysctl entries to use proc_douintvec · 0f76d256
      subashab@codeaurora.org authored
      proc_dointvec limits the values to INT_MAX in u32 sysctl entries.
      proc_douintvec allows to write upto UINT_MAX.
      Signed-off-by: default avatarSubash Abhinov Kasiviswanathan <subashab@codeaurora.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0f76d256
    • David S. Miller's avatar
      Merge branch 'be2net-error-recovery-and-bug-fixes' · 015777be
      David S. Miller authored
      Sriharsha Basavapatna says:
      
      ====================
      be2net: patch-set
      
      The following patch set contains an error recovery feature and a few
      bug fixes. Please consider applying this to the net-next tree. Thanks.
      
      Patch-1 Supports HW error recovery in Skyhawk/BEx adapters
      Patch-2 Fixes driver unload to issue function reset FW command
      Patch-3 Avoids issuing GET_EXT_FAT_CAPABILITIES command for VFs
      Patch-4 Avoids redundant addition of mac address in HW
      Patch-5 Fixes mac address collision in some configurations
      Patch-6 Updates driver version
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      015777be
    • Sriharsha Basavapatna's avatar
    • Suresh Reddy's avatar
      be2net: Fix mac address collision in some configurations · c27ebf58
      Suresh Reddy authored
      If the device mac address is updated using ndo_set_mac_address(),
      while the same mac address is already programmed, the driver does not
      detect this condition if its netdev->dev_addr has been changed. The
      driver tries to add the same mac address resulting in mac address
      collision error. This has been observed in bonding mode-5 configuration.
      
      To fix this, store the mac address configured in HW in the adapter
      structure. Use this to compare against the new address being updated
      to avoid collision.
      Signed-off-by: default avatarSuresh Reddy <Suresh.Reddy@broadcom.com>
      Signed-off-by: default avatarSathya Perla <sathya.perla@broadcom.com>
      Signed-off-by: default avatarSriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c27ebf58
    • Suresh Reddy's avatar
      be2net: Avoid redundant addition of mac address in HW · 988d44b1
      Suresh Reddy authored
      If a mac address is added to the uc_list and later the same mac address
      is added via ndo_set_mac_address() or vice versa, the driver does not
      detect this condition and tries to add it again. This results in a mac
      address collision error when the FW rejects it.
      
      Fix this by checking if the given mac address is present in uc_list while
      setting the device mac address and vice versa. Similarly skip deletion if
      the address is still in use in the other form.
      Signed-off-by: default avatarSuresh Reddy <Suresh.Reddy@broadcom.com>
      Signed-off-by: default avatarSathya Perla <sathya.perla@broadcom.com>
      Signed-off-by: default avatarSriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      988d44b1