- 18 Apr, 2018 6 commits
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David Ahern authored
Code move only. Signed-off-by:
David Ahern <dsahern@gmail.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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David Ahern authored
Pass network namespace reference into route add, delete and get functions. Signed-off-by:
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David Ahern authored
Pass net namespace to fib6_update_sernum. It can not be marked const as fib6_new_sernum will change ipv6.fib6_sernum. Signed-off-by:
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David Ahern authored
A later patch removes rt6i_table from rt6_info. Save the ipv6 table for a VRF in net_vrf. fib tables can not be deleted so no reference counting or locking is required. Signed-off-by:
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David Ahern authored
Need to keep expires time for IPv6 routes in a dump of FIB entries. Update rtnl_put_cacheinfo to allow dst to be NULL in which case rta_cacheinfo will only contain non-dst data. Signed-off-by:
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David Ahern authored
Move logic of fib_convert_metrics into ip_metrics_convert. This allows the code that converts netlink attributes into metrics struct to be re-used in a later patch by IPv6. This is mostly a code move with the following changes to variable names: - fi->fib_net becomes net - fc_mx and fc_mx_len are passed as inputs pulled from fib_config - metrics array is passed as an input from fi->fib_metrics->metrics Signed-off-by:
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- 17 Apr, 2018 27 commits
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Lorenzo Bianconi authored
Send a netlink notification when userspace adds a manually configured address if DAD is enabled and optimistic flag isn't set. Moreover send RTM_DELADDR notifications for tentative addresses. Some userspace applications (e.g. NetworkManager) are interested in addr netlink events albeit the address is still in tentative state, however events are not sent if DAD process is not completed. If the address is added and immediately removed userspace listeners are not notified. This behaviour can be easily reproduced by using veth interfaces: $ ip -b - <<EOF > link add dev vm1 type veth peer name vm2 > link set dev vm1 up > link set dev vm2 up > addr add 2001:db8:a:b:1:2:3:4/64 dev vm1 > addr del 2001:db8:a:b:1:2:3:4/64 dev vm1 EOF This patch reverts the behaviour introduced by the commit f784ad3d ("ipv6: do not send RTM_DELADDR for tentative addresses") Suggested-by:
Thomas Haller <thaller@redhat.com> Signed-off-by:
Lorenzo Bianconi <lorenzo.bianconi@redhat.com> Signed-off-by:
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Ganesh Goudar authored
Add support to display pause settings Signed-off-by:
Ganesh Goudar <ganeshgr@chelsio.com> Signed-off-by:
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Hangbin Liu authored
Like tos inherit, ttl inherit should also means inherit the inner protocol's ttl values, which actually not implemented in vxlan yet. But we could not treat ttl == 0 as "use the inner TTL", because that would be used also when the "ttl" option is not specified and that would be a behavior change, and breaking real use cases. So add a different attribute IFLA_VXLAN_TTL_INHERIT when "ttl inherit" is specified with ip cmd. Reported-by:
Jianlin Shi <jishi@redhat.com> Suggested-by:
Jiri Benc <jbenc@redhat.com> Signed-off-by:
Hangbin Liu <liuhangbin@gmail.com> Signed-off-by:
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Samuel Mendoza-Jonas authored
The NCSI driver defines a generic ncsi_channel_filter struct that can be used to store arbitrarily formatted filters, and several generic methods of accessing data stored in such a filter. However in both the driver and as defined in the NCSI specification there are only two actual filters: VLAN ID filters and MAC address filters. The splitting of the MAC filter into unicast, multicast, and mixed is also technically not necessary as these are stored in the same location in hardware. To save complexity, particularly in the set up and accessing of these generic filters, remove them in favour of two specific structs. These can be acted on directly and do not need several generic helper functions to use. This also fixes a memory error found by KASAN on ARM32 (which is not upstream yet), where response handlers accessing a filter's data field could write past allocated memory. [ 114.926512] ================================================================== [ 114.933861] BUG: KASAN: slab-out-of-bounds in ncsi_configure_channel+0x4b8/0xc58 [ 114.941304] Read of size 2 at addr 94888558 by task kworker/0:2/546 [ 114.947593] [ 114.949146] CPU: 0 PID: 546 Comm: kworker/0:2 Not tainted 4.16.0-rc6-00119-ge156398bfcad #13 ... [ 115.170233] The buggy address belongs to the object at 94888540 [ 115.170233] which belongs to the cache kmalloc-32 of size 32 [ 115.181917] The buggy address is located 24 bytes inside of [ 115.181917] 32-byte region [94888540, 94888560) [ 115.192115] The buggy address belongs to the page: [ 115.196943] page:9eeac100 count:1 mapcount:0 mapping:94888000 index:0x94888fc1 [ 115.204200] flags: 0x100(slab) [ 115.207330] raw: 00000100 94888000 94888fc1 0000003f 00000001 9eea2014 9eecaa74 96c003e0 [ 115.215444] page dumped because: kasan: bad access detected [ 115.221036] [ 115.222544] Memory state around the buggy address: [ 115.227384] 94888400: fb fb fb fb fc fc fc fc 04 fc fc fc fc fc fc fc [ 115.233959] 94888480: 00 00 00 fc fc fc fc fc 00 04 fc fc fc fc fc fc [ 115.240529] >94888500: 00 00 04 fc fc fc fc fc 00 00 04 fc fc fc fc fc [ 115.247077] ^ [ 115.252523] 94888580: 00 04 fc fc fc fc fc fc 06 fc fc fc fc fc fc fc [ 115.259093] 94888600: 00 00 06 fc fc fc fc fc 00 00 04 fc fc fc fc fc [ 115.265639] ================================================================== Reported-by:
Joel Stanley <joel@jms.id.au> Signed-off-by:
Samuel Mendoza-Jonas <sam@mendozajonas.com> Signed-off-by:
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Eric Biggers authored
Adding a dns_resolver key whose payload contains a very long option name resulted in that string being printed in full. This hit the WARN_ONCE() in set_precision() during the printk(), because printk() only supports a precision of up to 32767 bytes: precision 1000000 too large WARNING: CPU: 0 PID: 752 at lib/vsprintf.c:2189 vsnprintf+0x4bc/0x5b0 Fix it by limiting option strings (combined name + value) to a much more reasonable 128 bytes. The exact limit is arbitrary, but currently the only recognized option is formatted as "dnserror=%lu" which fits well within this limit. Also ratelimit the printks. Reproducer: perl -e 'print "#", "A" x 1000000, "\x00"' | keyctl padd dns_resolver desc @s This bug was found using syzkaller. Reported-by:Mark Rutland <mark.rutland@arm.com> Fixes: 4a2d7892 ("DNS: If the DNS server returns an error, allow that to be cached [ver #2]") Signed-off-by:
Eric Biggers <ebiggers@google.com> Signed-off-by:
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Davide Caratti authored
Signed-off-by:
Davide Caratti <dcaratti@redhat.com> Signed-off-by:
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Stephen Suryaputra authored
The statistics such as InHdrErrors should be counted on the ingress netdev rather than on the dev from the dst, which is the egress. Signed-off-by:
Stephen Suryaputra <ssuryaextr@gmail.com> Signed-off-by:
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David Ahern authored
BPF core gets access to __inet6_bind via ipv6_bpf_stub_impl, so it is not invoked directly outside of af_inet6.c. Make it static and move inet6_bind after to avoid forward declaration. Signed-off-by:
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David S. Miller authored
Jesper Dangaard Brouer says: ==================== XDP redirect memory return API Submitted against net-next, as it contains NIC driver changes. This patchset works towards supporting different XDP RX-ring memory allocators. As this will be needed by the AF_XDP zero-copy mode. The patchset uses mlx5 as the sample driver, which gets implemented XDP_REDIRECT RX-mode, but not ndo_xdp_xmit (as this API is subject to change thought the patchset). A new struct xdp_frame is introduced (modeled after cpumap xdp_pkt). And both ndo_xdp_xmit and the new xdp_return_frame end-up using this. Support for a driver supplied allocator is implemented, and a refurbished version of page_pool is the first return allocator type introduced. This will be a integration point for AF_XDP zero-copy. The mlx5 driver evolve into using the page_pool, and see a performance increase (with ndo_xdp_xmit out ixgbe driver) from 6Mpps to 12Mpps. The patchset stop at 16 patches (one over limit), but more API changes are planned. Specifically extending ndo_xdp_xmit and xdp_return_frame APIs to support bulking. As this will address some known limits. V2: Updated according to Tariq's feedback V3: Updated based on feedback from Jason Wang and Alex Duyck V4: Updated based on feedback from Tariq and Jason V5: Fix SPDX license, add Tariq's reviews, improve patch desc for perf test V6: Updated based on feedback from Eric Dumazet and Alex Duyck V7: Adapt to i40e that got XDP_REDIRECT support in-between V8: Updated based on feedback kbuild test robot, and adjust for mlx5 changes page_pool only compiled into kernel when drivers Kconfig 'select' feature V9: Remove some inline statements, let compiler decide what to inline Fix return value in virtio_net driver Adjust for mlx5 changes in-between submissions V10: Minor adjust for mlx5 requested by Tariq Resubmit against net-next V11: avoid leaking info stored in frame data on page reuse ==================== Acked-by:
Alexei Starovoitov <ast@kernel.org> Signed-off-by:
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Jesper Dangaard Brouer authored
The bpf infrastructure and verifier goes to great length to avoid bpf progs leaking kernel (pointer) info. For queueing an xdp_buff via XDP_REDIRECT, xdp_frame info stores kernel info (incl pointers) in top part of frame data (xdp->data_hard_start). Checks are in place to assure enough headroom is available for this. This info is not cleared, and if the frame is reused, then a malicious user could use bpf_xdp_adjust_head helper to move xdp->data into this area. Thus, making this area readable. This is not super critical as XDP progs requires root or CAP_SYS_ADMIN, which are privileged enough for such info. An effort (is underway) towards moving networking bpf hooks to the lesser privileged mode CAP_NET_ADMIN, where leaking such info should be avoided. Thus, this patch to clear the info when needed. Signed-off-by:
Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by:
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Jesper Dangaard Brouer authored
Changing API ndo_xdp_xmit to take a struct xdp_frame instead of struct xdp_buff. This brings xdp_return_frame and ndp_xdp_xmit in sync. This builds towards changing the API further to become a bulk API, because xdp_buff is not a queue-able object while xdp_frame is. V4: Adjust for commit 59655a5b ("tuntap: XDP_TX can use native XDP") V7: Adjust for commit d9314c47 ("i40e: add support for XDP_REDIRECT") Signed-off-by:
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Jesper Dangaard Brouer authored
Changing API xdp_return_frame() to take struct xdp_frame as argument, seems like a natural choice. But there are some subtle performance details here that needs extra care, which is a deliberate choice. When de-referencing xdp_frame on a remote CPU during DMA-TX completion, result in the cache-line is change to "Shared" state. Later when the page is reused for RX, then this xdp_frame cache-line is written, which change the state to "Modified". This situation already happens (naturally) for, virtio_net, tun and cpumap as the xdp_frame pointer is the queued object. In tun and cpumap, the ptr_ring is used for efficiently transferring cache-lines (with pointers) between CPUs. Thus, the only option is to de-referencing xdp_frame. It is only the ixgbe driver that had an optimization, in which it can avoid doing the de-reference of xdp_frame. The driver already have TX-ring queue, which (in case of remote DMA-TX completion) have to be transferred between CPUs anyhow. In this data area, we stored a struct xdp_mem_info and a data pointer, which allowed us to avoid de-referencing xdp_frame. To compensate for this, a prefetchw is used for telling the cache coherency protocol about our access pattern. My benchmarks show that this prefetchw is enough to compensate the ixgbe driver. V7: Adjust for commit d9314c47 ("i40e: add support for XDP_REDIRECT") V8: Adjust for commit bd658dda ("net/mlx5e: Separate dma base address and offset in dma_sync call") Signed-off-by:
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Jesper Dangaard Brouer authored
This patch shows how it is possible to have both the driver local page cache, which uses elevated refcnt for "catching"/avoiding SKB put_page returns the page through the page allocator. And at the same time, have pages getting returned to the page_pool from ndp_xdp_xmit DMA completion. The performance improvement for XDP_REDIRECT in this patch is really good. Especially considering that (currently) the xdp_return_frame API and page_pool_put_page() does per frame operations of both rhashtable ID-lookup and locked return into (page_pool) ptr_ring. (It is the plan to remove these per frame operation in a followup patchset). The benchmark performed was RX on mlx5 and XDP_REDIRECT out ixgbe, with xdp_redirect_map (using devmap) . And the target/maximum capability of ixgbe is 13Mpps (on this HW setup). Before this patch for mlx5, XDP redirected frames were returned via the page allocator. The single flow performance was 6Mpps, and if I started two flows the collective performance drop to 4Mpps, because we hit the page allocator lock (further negative scaling occurs). Two test scenarios need to be covered, for xdp_return_frame API, which is DMA-TX completion running on same-CPU or cross-CPU free/return. Results were same-CPU=10Mpps, and cross-CPU=12Mpps. This is very close to our 13Mpps max target. The reason max target isn't reached in cross-CPU test, is likely due to RX-ring DMA unmap/map overhead (which doesn't occur in ixgbe to ixgbe testing). It is also planned to remove this unnecessary DMA unmap in a later patchset V2: Adjustments requested by Tariq - Changed page_pool_create return codes not return NULL, only ERR_PTR, as this simplifies err handling in drivers. - Save a branch in mlx5e_page_release - Correct page_pool size calc for MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ V5: Updated patch desc V8: Adjust for b0cedc84 ("net/mlx5e: Remove rq_headroom field from params") V9: - Adjust for 121e8927 ("net/mlx5e: Refactor RQ XDP_TX indication") - Adjust for 73281b78 ("net/mlx5e: Derive Striding RQ size from MTU") - Correct handling if page_pool_create fail for MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ V10: Req from Tariq - Change pool_size calc for MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ Signed-off-by:
Tariq Toukan <tariqt@mellanox.com> Acked-by:
Saeed Mahameed <saeedm@mellanox.com> Signed-off-by:
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Jesper Dangaard Brouer authored
New allocator type MEM_TYPE_PAGE_POOL for page_pool usage. The registered allocator page_pool pointer is not available directly from xdp_rxq_info, but it could be (if needed). For now, the driver should keep separate track of the page_pool pointer, which it should use for RX-ring page allocation. As suggested by Saeed, to maintain a symmetric API it is the drivers responsibility to allocate/create and free/destroy the page_pool. Thus, after the driver have called xdp_rxq_info_unreg(), it is drivers responsibility to free the page_pool, but with a RCU free call. This is done easily via the page_pool helper page_pool_destroy() (which avoids touching any driver code during the RCU callback, which could happen after the driver have been unloaded). V8: address issues found by kbuild test robot - Address sparse should be static warnings - Allow xdp.o to be compiled without page_pool.o V9: Remove inline from .c file, compiler knows best Signed-off-by:
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Jesper Dangaard Brouer authored
Need a fast page recycle mechanism for ndo_xdp_xmit API for returning pages on DMA-TX completion time, which have good cross CPU performance, given DMA-TX completion time can happen on a remote CPU. Refurbish my page_pool code, that was presented[1] at MM-summit 2016. Adapted page_pool code to not depend the page allocator and integration into struct page. The DMA mapping feature is kept, even-though it will not be activated/used in this patchset. [1] http://people.netfilter.org/hawk/presentations/MM-summit2016/generic_page_pool_mm_summit2016.pdf V2: Adjustments requested by Tariq - Changed page_pool_create return codes, don't return NULL, only ERR_PTR, as this simplifies err handling in drivers. V4: many small improvements and cleanups - Add DOC comment section, that can be used by kernel-doc - Improve fallback mode, to work better with refcnt based recycling e.g. remove a WARN as pointed out by Tariq e.g. quicker fallback if ptr_ring is empty. V5: Fixed SPDX license as pointed out by Alexei V6: Adjustments requested by Eric Dumazet - Adjust ____cacheline_aligned_in_smp usage/placement - Move rcu_head in struct page_pool - Free pages quicker on destroy, minimize resources delayed an RCU period - Remove code for forward/backward compat ABI interface V8: Issues found by kbuild test robot - Address sparse should be static warnings - Only compile+link when a driver use/select page_pool, mlx5 selects CONFIG_PAGE_POOL, although its first used in two patches Signed-off-by:
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Jesper Dangaard Brouer authored
Use the IDA infrastructure for getting a cyclic increasing ID number, that is used for keeping track of each registered allocator per RX-queue xdp_rxq_info. Instead of using the IDR infrastructure, which uses a radix tree, use a dynamic rhashtable, for creating ID to pointer lookup table, because this is faster. The problem that is being solved here is that, the xdp_rxq_info pointer (stored in xdp_buff) cannot be used directly, as the guaranteed lifetime is too short. The info is needed on a (potentially) remote CPU during DMA-TX completion time . In an xdp_frame the xdp_mem_info is stored, when it got converted from an xdp_buff, which is sufficient for the simple page refcnt based recycle schemes. For more advanced allocators there is a need to store a pointer to the registered allocator. Thus, there is a need to guard the lifetime or validity of the allocator pointer, which is done through this rhashtable ID map to pointer. The removal and validity of of the allocator and helper struct xdp_mem_allocator is guarded by RCU. The allocator will be created by the driver, and registered with xdp_rxq_info_reg_mem_model(). It is up-to debate who is responsible for freeing the allocator pointer or invoking the allocator destructor function. In any case, this must happen via RCU freeing. Use the IDA infrastructure for getting a cyclic increasing ID number, that is used for keeping track of each registered allocator per RX-queue xdp_rxq_info. V4: Per req of Jason Wang - Use xdp_rxq_info_reg_mem_model() in all drivers implementing XDP_REDIRECT, even-though it's not strictly necessary when allocator==NULL for type MEM_TYPE_PAGE_SHARED (given it's zero). V6: Per req of Alex Duyck - Introduce rhashtable_lookup() call in later patch V8: Address sparse should be static warnings (from kbuild test robot) Signed-off-by:
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Jesper Dangaard Brouer authored
Now all the users of ndo_xdp_xmit have been converted to use xdp_return_frame. This enable a different memory model, thus activating another code path in the xdp_return_frame API. V2: Fixed issues pointed out by Tariq. Signed-off-by:
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Jesper Dangaard Brouer authored
Also convert driver i40e, which very recently got XDP_REDIRECT support in commit d9314c47 ("i40e: add support for XDP_REDIRECT"). V7: This patch got added in V7 of this patchset. Signed-off-by:
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Jesper Dangaard Brouer authored
The generic xdp_frame format, was inspired by the cpumap own internal xdp_pkt format. It is now time to convert it over to the generic xdp_frame format. The cpumap needs one extra field dev_rx. Signed-off-by:
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Jesper Dangaard Brouer authored
The virtio_net driver assumes XDP frames are always released based on page refcnt (via put_page). Thus, is only queues the XDP data pointer address and uses virt_to_head_page() to retrieve struct page. Use the XDP return API to get away from such assumptions. Instead queue an xdp_frame, which allow us to use the xdp_return_frame API, when releasing the frame. V8: Avoid endianness issues (found by kbuild test robot) V9: Change __virtnet_xdp_xmit from bool to int return value (found by Dan Carpenter) Signed-off-by:
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Jesper Dangaard Brouer authored
The tuntap driver invented it's own driver specific way of queuing XDP packets, by storing the xdp_buff information in the top of the XDP frame data. Convert it over to use the more generic xdp_frame structure. The main problem with the in-driver method is that the xdp_rxq_info pointer cannot be trused/used when dequeueing the frame. V3: Remove check based on feedback from Jason Signed-off-by:
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Jesper Dangaard Brouer authored
This is needed to convert drivers tuntap and virtio_net. This is a generalization of what is done inside cpumap, which will be converted later. Signed-off-by:
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Jesper Dangaard Brouer authored
This is done to prepare for the next patch, and it is also nice to move this XDP related struct out of filter.h. Signed-off-by:
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Jesper Dangaard Brouer authored
Extend struct ixgbe_tx_buffer to store the xdp_mem_info. Notice that this could be optimized further by putting this into a union in the struct ixgbe_tx_buffer, but this patchset works towards removing this again. Thus, this is not done. Signed-off-by:
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Jesper Dangaard Brouer authored
Introduce an xdp_return_frame API, and convert over cpumap as the first user, given it have queued XDP frame structure to leverage. V3: Cleanup and remove C99 style comments, pointed out by Alex Duyck. V6: Remove comment that id will be added later (Req by Alex Duyck) V8: Rename enum mem_type to xdp_mem_type (found by kbuild test robot) Signed-off-by:
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Jesper Dangaard Brouer authored
This implements basic XDP redirect support in mlx5 driver. Notice that the ndo_xdp_xmit() is NOT implemented, because that API need some changes that this patchset is working towards. The main purpose of this patch is have different drivers doing XDP_REDIRECT to show how different memory models behave in a cross driver world. Update(pre-RFCv2 Tariq): Need to DMA unmap page before xdp_do_redirect, as the return API does not exist yet to to keep this mapped. Update(pre-RFCv3 Saeed): Don't mix XDP_TX and XDP_REDIRECT flushing, introduce xdpsq.db.redirect_flush boolian. V9: Adjust for commit 121e8927 ("net/mlx5e: Refactor RQ XDP_TX indication") Signed-off-by:
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Intiyaz Basha authored
1. Added red_drops stats. Inbound packets dropped by RED, buffer exhaustion 2. Included fcs_err, jabber_err, l2_err and frame_err errors under rx_errors 3. Included fifo_err, dmac_drop, red_drops, fw_err_pko, fw_err_link and fw_err_drop under rx_dropped 4. Included max_collision_fail, max_deferral_fail, total_collisions, fw_err_pko, fw_err_link, fw_err_drop and fw_err_pki under tx_dropped 5. Counting dma mapping errors 6. Added some firmware stats description and removed for some Signed-off-by:
Intiyaz Basha <intiyaz.basha@cavium.com> Acked-by:
Derek Chickles <derek.chickles@cavium.com> Acked-by:
Satanand Burla <satananda.burla@cavium.com> Signed-off-by:
Felix Manlunas <felix.manlunas@cavium.com> Signed-off-by:
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- 16 Apr, 2018 7 commits
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Andrey Ignatov authored
This tracepoint was replaced by inet_sock_set_state in 563e0bb0 and not used anywhere in the kernel anymore. Remove it. Signed-off-by:
Andrey Ignatov <rdna@fb.com> Signed-off-by:
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David S. Miller authored
Heiner Kallweit says: ==================== PCI: add two more values for PCIe Max_Read_Request_Size and initially use them in r8169 network driver In r8169 network driver I stumbled across a magic number translating to PCI MRRS size 4K. The PCI core is still missing constants for values 2K and 4K (as defined in PCI standard). So let's add these two constants and use the 4K constant in r8169. Second patch depends on the first one, therefore both patches preferrably should go through either PCI or netdev tree. ==================== Signed-off-by: -
Heiner Kallweit authored
Replace magic number "0x5 << MAX_READ_REQUEST_SHIFT" with the appropriate constant as defined in PCI core. Signed-off-by:
Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by:
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Heiner Kallweit authored
This patch adds missing values for the max read request size. E.g. network driver r8169 uses a value of 4K. Signed-off-by:
Bjorn Helgaas <bhelgaas@google.com> Signed-off-by:
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David S. Miller authored
Jose Abreu says: ==================== net: stmmac: Stop using hard-coded callbacks This a starting point for a cleanup and re-organization of stmmac. In this series we stop using hard-coded callbacks along the code and use instead helpers which are defined in a single place ("hwif.h"). This brings several advantages: 1) Less typing :) 2) Guaranteed function pointer check 3) More flexibility By 2) we stop using the repeated pattern of: if (priv->hw->mac->some_func) priv->hw->mac->some_func(...) I didn't check but I expect the final .ko will be bigger with this series because *all* of function pointers are checked. Anyway, I hope this can make the code more readable and more flexible now. ==================== Signed-off-by: -
Jose Abreu authored
Switch stmmac_mode_ops to generic Hardware Interface Helpers instead of using hard-coded callbacks. This makes the code more readable and more flexible. No functional change. Signed-off-by:
Jose Abreu <joabreu@synopsys.com> Cc: David S. Miller <davem@davemloft.net> Cc: Joao Pinto <jpinto@synopsys.com> Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com> Cc: Alexandre Torgue <alexandre.torgue@st.com> Signed-off-by:
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Jose Abreu authored
Switch stmmac_hwtimestamp to generic Hardware Interface Helpers instead of using hard-coded callbacks. This makes the code more readable and more flexible. No functional change. Signed-off-by:
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