- 16 Mar, 2015 28 commits
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Thomas Graf authored
Caching the lock pointer avoids having to hash on the object again to unlock the bucket locks. Signed-off-by:
Thomas Graf <tgraf@suug.ch> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Eric Dumazet authored
Changes in tcp_metric hash table are protected by tcp_metrics_lock only, not by genl_mutex While we are at it use deref_locked() instead of rcu_dereference() in tcp_new() to avoid unnecessary barrier, as we hold tcp_metrics_lock as well. Reported-by:
Andrew Vagin <avagin@parallels.com> Signed-off-by:
Eric Dumazet <edumazet@google.com> Fixes: 098a697b ("tcp_metrics: Use a single hash table for all network namespaces.") Reviewed-by:
"Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by:
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Jiri Pirko authored
This would fix randconfig compile error: net/built-in.o: In function `netdev_switch_fib_ipv4_abort': (.text+0xf7811): undefined reference to `fib_flush_external' Also it fixes following warnings: warning: (NET_DSA) selects NET_SWITCHDEV which has unmet direct dependencies (NET && INET) warning: (NET_DSA_MV88E6060 && NET_DSA_MV88E6131 && NET_DSA_MV88E6123_61_65 && NET_DSA_MV88E6171 && NET_DSA_MV88E6352 && NET_DSA_BCM_SF2) selects NET_DSA which has unmet direct dependencies (NET && HAVE_NET_DSA && NET_SWITCHDEV) Reported-by:
Randy Dunlap <rdunlap@infradead.org> Suggested-by:
Alexei Starovoitov <alexei.starovoitov@gmail.com> Signed-off-by:
Jiri Pirko <jiri@resnulli.us> Signed-off-by:
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Shaohui Xie authored
MDIO controller on little endian Socs, e.g. ls2085a is similar to the controller on big endian Socs, but the MDIO access is little endian, we use I/O accessor function to handle endianness, so the driver can run on little endian Socs. A property "little-endian" is used in DTS to indicate the MDIO is little endian, if driver probes the property, driver will access MDIO in little endian, otherwise, driver works in big endian by default. Signed-off-by:
Shaohui Xie <Shaohui.Xie@freescale.com> Signed-off-by:
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Shaohui Xie authored
There is a bug in xgmac_wait_until_done() which mdio_stat should be used instead of mdio_data when checking if busy bit is cleared. Signed-off-by:
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Ying Xue authored
Creating a kernel socket with sock_create_kern() happens in "init_net" namespace, however, releasing it with sk_release_kernel() occurs in the current namespace which may be different with "init_net" namespace. Therefore, we should guarantee that the namespace in which a kernel socket is created is same as the socket is created. Signed-off-by:
Ying Xue <ying.xue@windriver.com> Signed-off-by:
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Thomas Graf authored
Fixes the following sparse warnings: lib/rhashtable.c:767:5: warning: context imbalance in 'rhashtable_walk_start' - wrong count at exit lib/rhashtable.c:849:6: warning: context imbalance in 'rhashtable_walk_stop' - unexpected unlock Fixes: f2dba9c6 ("rhashtable: Introduce rhashtable_walk_*") Signed-off-by:
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Scott Feldman authored
In hast to fix some sparse warning, I hard-coded a fix-sized array on the stack which is probably too big for kernel standards. Fix this by converting array to dynamic allocation. Signed-off-by:
Scott Feldman <sfeldma@gmail.com> Acked-by:
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David S. Miller authored
Eric Dumazet says: ==================== inet: tcp listener refactoring, part 10 We are getting close to the point where request sockets will be hashed into generic hash table. Some followups are needed for netfilter and will be handled in next patch series. ==================== Signed-off-by: -
Eric Dumazet authored
reqsk_put() is the generic function that should be used to release a refcount (and automatically call reqsk_free()) reqsk_free() might be called if refcount is known to be 0 or undefined. refcnt is set to one in inet_csk_reqsk_queue_add() As request socks are not yet in global ehash table, I added temporary debugging checks in reqsk_put() and reqsk_free() Signed-off-by:
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Eric Dumazet authored
sock_edemux() is not used in fast path, and should really call sock_gen_put() to save some code. Signed-off-by:
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Eric Dumazet authored
inet_diag_fill_req() is renamed to inet_req_diag_fill() and moved up, so that it can be called fom sk_diag_fill() inet_diag_bc_sk() is ready to handle request socks. inet_twsk_diag_dump() is no longer needed. Signed-off-by:
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Eric Dumazet authored
When a request socket is created, we do not cache ip route dst entry, like for timewait sockets. Let's use sk_fullsock() helper. Signed-off-by:
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Eric Dumazet authored
We have many places where we want to check if a socket is not a timewait or request socket. Use a helper to avoid hard coding this. Signed-off-by:
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David S. Miller authored
Scott Feldman says: ==================== switchdev: add swdev ops v3: - Fix missing include for DSA build v2: - Per Simon's review, squash some of the dependent commits into one to make series git bisect safe. v1: Per discussions at netconf, move switchdev ndo ops to a new swdev_ops to keep ndo namespace clean and maintain switchdev-related ops into one place. There are no functional changes here; just shuffling ops around for better organization. ==================== Signed-off-by: -
Scott Feldman authored
Signed-off-by:
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Scott Feldman authored
Move swdev wrappers over to new swdev ops (from previous ndo ops). No functional changes to the implementation. Signed-off-by:
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Scott Feldman authored
As discussed at netconf, introduce swdev_ops as first step to move switchdev ops from ndo to swdev. This will keep switchdev from cluttering up ndo ops space. Signed-off-by:
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David S. Miller authored
Herbert Xu says: ==================== rhashtable: Fix two bugs caused by multiple rehash preparation While testing some new patches over the weekend I discovered a couple of bugs in the series that had just been merged. These two patches fix them: 1) A use-after-free in the walker that can cause crashes when walking during a rehash. 2) When a second rehash starts during a single rhashtable_remove call the remove may fail when it shouldn't. ==================== Signed-off-by: -
Herbert Xu authored
The commit 9d901bc0 ("rhashtable: Free bucket tables asynchronously after rehash") causes gratuitous failures in rhashtable_remove. The reason is that it inadvertently introduced multiple rehashing from the perspective of readers. IOW it is now possible to see more than two tables during a single RCU critical section. Fortunately the other reader rhashtable_lookup already deals with this correctly thanks to c4db8848 ("rhashtable: rhashtable: Move future_tbl into struct bucket_table") so only rhashtable_remove is broken by this change. This patch fixes this by looping over every table from the first one to the last or until we find the element that we were trying to delete. Incidentally the simple test for detecting rehashing to prevent starting another shrinking no longer works. Since it isn't needed anyway (the work queue and the mutex serves as a natural barrier to unnecessary rehashes) I've simply killed the test. Signed-off-by:
Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by:
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Herbert Xu authored
The commit c4db8848 ("rhashtable: Move future_tbl into struct bucket_table") introduced a use-after- free bug in rhashtable_walk_stop because it dereferences tbl after droping the RCU read lock. This patch fixes it by moving the RCU read unlock down to the bottom of rhashtable_walk_stop. In fact this was how I had it originally but it got dropped while rearranging patches because this one depended on the async freeing of bucket_table. Signed-off-by:
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Petri Gynther authored
Add support for Hardware Filter Block (HFB) so that incoming Rx traffic can be matched and directed to desired Rx queues. Signed-off-by:
Petri Gynther <pgynther@google.com> Signed-off-by:
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David S. Miller authored
Alexei Starovoitov says: ==================== bpf: allow eBPF access skb fields V1->V2: - refactored field access converter into common helper convert_skb_access() used in both classic and extended BPF - added missing build_bug_on for field 'len' - added comment to uapi/linux/bpf.h as suggested by Daniel - dropped exposing 'ifindex' field for now classic BPF has a way to access skb fields, whereas extended BPF didn't. This patch introduces this ability. Classic BPF can access fields via negative SKF_AD_OFF offset. Positive bpf_ld_abs N is treated as load from packet, whereas bpf_ld_abs -0x1000 + N is treated as skb fields access. Many offsets were hard coded over years: SKF_AD_PROTOCOL, SKF_AD_PKTTYPE, etc. The problem with this approach was that for every new field classic bpf assembler had to be tweaked. I've considered doing the same for extended, but for every new field LLVM compiler would have to be modifed. Since it would need to add a new intrinsic. It could be done with single intrinsic and magic offset or use of inline assembler, but neither are clean from compiler backend point of view, since they look like calls but shouldn't scratch caller-saved registers. Another approach was to introduce a new helper functions like bpf_get_pkt_type() for every field that we want to access, but that is equally ugly for kernel and slow, since helpers are calls and they are slower then just loads. In theory helper calls can be 'inlined' inside kernel into direct loads, but since they were calls for user space, compiler would have to spill registers around such calls anyway. Teaching compiler to treat such helpers differently is even uglier. They were few other ideas considered. At the end the best seems to be to introduce a user accessible mirror of in-kernel sk_buff structure: struct __sk_buff { __u32 len; __u32 pkt_type; __u32 mark; __u32 queue_mapping; }; bpf programs will do: int bpf_prog1(struct __sk_buff *skb) { __u32 var = skb->pkt_type; which will be compiled to bpf assembler as: dst_reg = *(u32 *)(src_reg + 4) // 4 == offsetof(struct __sk_buff, pkt_type) bpf verifier will check validity of access and will convert it to: dst_reg = *(u8 *)(src_reg + offsetof(struct sk_buff, __pkt_type_offset)) dst_reg &= 7 since 'pkt_type' is a bitfield. No new instructions added. LLVM doesn't need to be modified. JITs don't change and verifier already knows when it accesses 'ctx' pointer. The only thing needed was to convert user visible offset within __sk_buff to kernel internal offset within sk_buff. For 'len' and other fields conversion is trivial. Converting 'pkt_type' takes 2 or 3 instructions depending on endianness. More fields can be exposed by adding to the end of the 'struct __sk_buff'. Like vlan_tci and others can be added later. When pkt_type field is moved around, goes into different structure, removed or its size changes, the function convert_skb_access() would need to updated and it will cover both classic and extended. Patch 2 updates examples to demonstrates how fields are accessed and adds new tests for verifier, since it needs to detect a corner case when attacker is using single bpf instruction in two branches with different register types. The 4 fields of __sk_buff are already exposed to user space via classic bpf and I believe they're useful in extended as well. ==================== Signed-off-by: -
Alexei Starovoitov authored
- modify sockex1 example to count number of bytes in outgoing packets - modify sockex2 example to count number of bytes and packets per flow - add 4 stress tests that exercise 'skb->field' code path of verifier Signed-off-by:
Alexei Starovoitov <ast@plumgrid.com> Signed-off-by:
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Alexei Starovoitov authored
introduce user accessible mirror of in-kernel 'struct sk_buff': struct __sk_buff { __u32 len; __u32 pkt_type; __u32 mark; __u32 queue_mapping; }; bpf programs can do: int bpf_prog(struct __sk_buff *skb) { __u32 var = skb->pkt_type; which will be compiled to bpf assembler as: dst_reg = *(u32 *)(src_reg + 4) // 4 == offsetof(struct __sk_buff, pkt_type) bpf verifier will check validity of access and will convert it to: dst_reg = *(u8 *)(src_reg + offsetof(struct sk_buff, __pkt_type_offset)) dst_reg &= 7 since skb->pkt_type is a bitfield. Signed-off-by: -
David S. Miller authored
Daniel Borkmann says: ==================== eBPF updates Two small eBPF helper additions to better match up with ancillary classic BPF functionality. ==================== Signed-off-by: -
Daniel Borkmann authored
This patch adds the possibility to obtain raw_smp_processor_id() in eBPF. Currently, this is only possible in classic BPF where commit da2033c2 ("filter: add SKF_AD_RXHASH and SKF_AD_CPU") has added facilities for this. Perhaps most importantly, this would also allow us to track per CPU statistics with eBPF maps, or to implement a poor-man's per CPU data structure through eBPF maps. Example function proto-type looks like: u32 (*smp_processor_id)(void) = (void *)BPF_FUNC_get_smp_processor_id; Signed-off-by:
Daniel Borkmann <daniel@iogearbox.net> Signed-off-by:
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Daniel Borkmann authored
This work is similar to commit 4cd3675e ("filter: added BPF random opcode") and adds a possibility for packet sampling in eBPF. Currently, this is only possible in classic BPF and useful to combine sampling with f.e. packet sockets, possible also with tc. Example function proto-type looks like: u32 (*prandom_u32)(void) = (void *)BPF_FUNC_get_prandom_u32; Signed-off-by:
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- 15 Mar, 2015 11 commits
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David S. Miller authored
Claudiu Manoil says: ==================== gianfar: ARM port driver updates (2/2) The 2nd round of driver updates to make gianfar portable on ARM, for the ARM based SoC that integrates eTSEC - "ls1021a". The patches address the bulk of remaining endianess issues - handling DMA fields (BD and FCB), and device tree properties. ==================== Signed-off-by: -
Jingchang Lu authored
Use of_property_read*() to get arch endian consistent property values. Do some refactoring in the process. Signed-off-by:
Jingchang Lu <jingchang.lu@freescale.com> Signed-off-by:
Claudiu Manoil <claudiu.manoil@freescale.com> Signed-off-by:
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Claudiu Manoil authored
Use conversion macros to correctly access the BE fields of the Rx and Tx Frame Control Block on LE CPUs. Signed-off-by:
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Claudiu Manoil authored
Use conversion macros to correctly access the BE fields of the Rx and Tx Buffer Descriptors on LE CPUs. Signed-off-by:
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David S. Miller authored
Herbert Xu says: ==================== rhashtable: Fixes + cleanups + preparation for multiple rehash Patch 1 fixes the walker so that it behaves properly even during a resize. Patch 2-3 are cleanups. Patch 4-6 lays some ground work for the upcoming multiple rehashing. This revision fixes the warning coming from the bucket_table->size downsize and improves its changelog. ==================== Signed-off-by: -
Herbert Xu authored
This patch moves future_tbl to open up the possibility of having multiple rehashes on the same table. Signed-off-by:
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Herbert Xu authored
This patch adds a rehash counter to bucket_table to indicate the last bucket that has been rehashed. This serves two purposes: 1. Any bucket that has been rehashed can never gain a new object. 2. If the rehash counter reaches the size of the table, the table will forever remain empty. This patch also downsizes bucket_table->size to an unsigned int since we do not support sizes greater than 32 bits yet. Signed-off-by:
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Herbert Xu authored
There is in fact no need to wait for an RCU grace period in the rehash function, since all insertions are guaranteed to go into the new table through spin locks. This patch uses call_rcu to free the old/rehashed table at our leisure. Signed-off-by:
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Herbert Xu authored
It seems that I have already made every rehash redo the random seed even though my commit message indicated otherwise :) Since we have already taken that step, this patch goes one step further and moves the seed initialisation into bucket_table_alloc. Signed-off-by:
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Herbert Xu authored
We only nest one level deep there is no need to roll our own subclasses. Signed-off-by:
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Herbert Xu authored
Previously whenever the walker encountered a resize it simply snaps back to the beginning and starts again. However, this only works if the rehash started and completed while the walker was idle. If the walker attempts to restart while the rehash is still ongoing, we may miss objects that we shouldn't have. This patch fixes this by making the walker walk the old table followed by the new table just like all other readers. If a rehash is detected we will still signal our caller of the fact so they can prepare for duplicates but we will simply continue the walk onto the new table after the old one is finished either by us or by the rehasher. Signed-off-by:
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- 14 Mar, 2015 1 commit
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Florian Fainelli authored
Commit cd28a1a9 ("net: dsa: fully divert PHY reads/writes if requested") introduced a check for particular PHYs that need to be accessed using the slave MII bus created by DSA, but this check was too inclusive. This would prevent fixed PHYs from being successfully registered because those should not go through the slave MII bus created by DSA. Make sure we check that the PHY is not a fixed PHY to prevent that from happening. Fixes: cd28a1a9 ("net: dsa: fully divert PHY reads/writes if requested") Signed-off-by:
Florian Fainelli <f.fainelli@gmail.com> Signed-off-by:
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