- 07 Jul, 2020 17 commits
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Stanislav Fomichev authored
Add auto-detection for the cgroup/sock_release programs. Signed-off-by:
Stanislav Fomichev <sdf@google.com> Signed-off-by:
Daniel Borkmann <daniel@iogearbox.net> Acked-by:
Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/20200706230128.4073544-3-sdf@google.com
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Stanislav Fomichev authored
Sometimes it's handy to know when the socket gets freed. In particular, we'd like to try to use a smarter allocation of ports for bpf_bind and explore the possibility of limiting the number of SOCK_DGRAM sockets the process can have. Implement BPF_CGROUP_INET_SOCK_RELEASE hook that triggers on inet socket release. It triggers only for userspace sockets (not in-kernel ones) and therefore has the same semantics as the existing BPF_CGROUP_INET_SOCK_CREATE. Signed-off-by:
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Matteo Croce authored
priv->page_pool is an array, so comparing against it will always return true. Do a meaningful check by checking priv->page_pool[0] instead. While at it, clear the page_pool pointers on deallocation, or when an allocation error happens during init. Reported-by:
Colin Ian King <colin.king@canonical.com> Fixes: c2d6fe61 ("mvpp2: XDP TX support") Signed-off-by:
Matteo Croce <mcroce@microsoft.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Florian Westphal authored
We can re-use the existing work queue to handle path management instead of a dedicated work queue. Just move pm_worker to protocol.c, call it from the mptcp worker and get rid of the msk lock (already held). Signed-off-by:
Florian Westphal <fw@strlen.de> Reviewed-by:
Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by:
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Wei Yongjun authored
In certain configurations without power management support, gcc report the following warning: drivers/net/ethernet/sun/cassini.c:5206:12: warning: 'cas_resume' defined but not used [-Wunused-function] 5206 | static int cas_resume(struct device *dev_d) | ^~~~~~~~~~ Mark cas_resume() as __maybe_unused to make it clear. Fixes: f193f4eb ("sun/cassini: use generic power management") Reported-by:Hulk Robot <hulkci@huawei.com> Signed-off-by:
Wei Yongjun <weiyongjun1@huawei.com> Signed-off-by:
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Vaibhav Gupta authored
The upgraded .suspend() and .resume() throw "defined but not used [-Wunused-function]" warning for certain configurations. Mark them with "__maybe_unused" attribute. Compile-tested only. Fixes: b0db0cc2 ("sun/niu: use generic power management") Reported-by:
Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by:
Vaibhav Gupta <vaibhavgupta40@gmail.com> Signed-off-by:
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David S. Miller authored
Andrew Lunn says: ==================== drivers/net/phy C=1 W=1 fixes This fixes most of the Sparse and W=1 warnings in drivers/net/phy. The Cavium code is still not fully clean, but it might actually be the strange code is confusing Sparse. v2 -- Added RB, TB, AB. s/case/cause Reverse Christmas tree Module soft dependencies ==================== Signed-off-by: -
Andrew Lunn authored
To ensure that the octeon MDIO driver has been loaded, the Cavium ethernet drivers reference a dummy symbol in the MDIO driver. This forces it to be loaded first. And this symbol has not been cleanly implemented, resulting in warnings when build W=1 C=1. Since device tree is being used, and a phandle points to the PHY on the MDIO bus, we can make use of deferred probing. If the PHY fails to connect, it should be because the MDIO bus driver has not loaded yet. Return -EPROBE_DEFER so it will be tried again later. Additionally, add a MODULE_SOFTDEP() to give user space a hint as to what order it should load the modules. v2: s/octoen/octeon/ Add MODULE_SOFTDEP() Cc: Sunil Goutham <sgoutham@marvell.com> Cc: Robert Richter <rrichter@marvell.com> Cc: Chris Packham <chris.packham@alliedtelesis.co.nz> Tested-by:
Chris Packham <chris.packham@alliedtelesis.co.nz> Acked-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by:
Florian Fainelli <f.fainelli@gmail.com> Signed-off-by:
Andrew Lunn <andrew@lunn.ch> Signed-off-by:
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Andrew Lunn authored
The MIPS low level register access functions seem to be missing __iomem annotation. This causes lots of sparse warnings, when code casts off the __iomem. Make the Cavium MDIO drivers cleaner by pushing the casts lower down into the helpers, allow the drivers to work as normal, with __iomem. bus->register_base is now an void *, rather than a u64. So forming the mii_bus->id string cannot use %llx any more. Use %px, so this kernel address is still exposed to user space, as it was before. v2: s/cases/causes/g Cc: Sunil Goutham <sgoutham@marvell.com> Cc: Robert Richter <rrichter@marvell.com> Reviewed-by:
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Andrew Lunn authored
ntohs() expects to be passed a __be16. Correct the type of the variable holding the sequence ID. Cc: Richard Cochran <richardcochran@gmail.com> Acked-by:
Richard Cochran <richardcochran@gmail.com> Reviewed-by:
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Andrew Lunn authored
This array is not used outside of phy_device.c, so make it static. Reviewed-by:
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Andrew Lunn authored
Avoid the W=1 warning that symbol 'genphy_c45_driver' was not declared. Should it be static? Declare it on the phy header file. Reviewed-by:
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Andrew Lunn authored
Correct the kerneldoc for a few structure and function calls, as reported by C=1 W=1. Cc: Alexandru Ardelean <alexaundru.ardelean@analog.com> Reviewed-by:
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Andrew Lunn authored
By placing the GENMASK value into an unsigned int and then passing it to PREF_FIELD, the type is reduces down from ULL. Given the reduced size of the type, the range checks in PREP_FAIL() are always true, and -Wtype-limits then gives a warning. By skipping the intermediate variable, the warning can be avoided. Reviewed-by:
Jakub Kicinski <kuba@kernel.org> Signed-off-by:
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Chris Healy authored
Dynamically generate a unique GPIO interrupt name, based on the device name and the GPIO name. For example: 103: 0 sx1503q 12 Edge sff2-los 104: 0 sx1503q 13 Edge sff2-tx-fault The sffX indicates the SFP the los and tx-fault are associated with. v3: - reverse Christmas tree new variable - fix spaces vs tabs v2: - added net-next to PATCH part of subject line - switched to devm_kasprintf() Signed-off-by:
Chris Healy <cphealy@gmail.com> Signed-off-by:
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Jacob Keller authored
The recent change by commit 8d7aab35 ("ice: implement snapshot for device capabilities") to implement the device-caps region for the ice driver forgot to document it. Add documentation to the ice devlink documentation file describing the new region and add some sample output to the shell commands provided as an example. Fixes: 8d7aab35 ("ice: implement snapshot for device capabilities") Signed-off-by:
Jacob Keller <jacob.e.keller@intel.com> Signed-off-by:
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Florian Fainelli authored
SYSTEMPORT is capable of performing VLAN transmit acceleration, support that by configuring it appropriately, providing the VLAN ID and PCP/DEI where necessary. Signed-off-by:
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- 06 Jul, 2020 20 commits
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Davide Caratti authored
syzkaller was able to make the kernel reach subflow_data_ready() for a server subflow that was closed before subflow_finish_connect() completed. In these cases we can avoid using the path for regular/fallback MPTCP data, and just wake the main socket, to avoid the following warning: WARNING: CPU: 0 PID: 9370 at net/mptcp/subflow.c:885 subflow_data_ready+0x1e6/0x290 net/mptcp/subflow.c:885 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 9370 Comm: syz-executor.0 Not tainted 5.7.0 #106 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga5cab58e9a3f-prebuilt.qemu.org 04/01/2014 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xb7/0xfe lib/dump_stack.c:118 panic+0x29e/0x692 kernel/panic.c:221 __warn.cold+0x2f/0x3d kernel/panic.c:582 report_bug+0x28b/0x2f0 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:105 [inline] fixup_bug arch/x86/kernel/traps.c:100 [inline] do_error_trap+0x10f/0x180 arch/x86/kernel/traps.c:197 do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:216 invalid_op+0x1e/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:subflow_data_ready+0x1e6/0x290 net/mptcp/subflow.c:885 Code: 04 02 84 c0 74 06 0f 8e 91 00 00 00 41 0f b6 5e 48 31 ff 83 e3 18 89 de e8 37 ec 3d fe 84 db 0f 85 65 ff ff ff e8 fa ea 3d fe <0f> 0b e9 59 ff ff ff e8 ee ea 3d fe 48 89 ee 4c 89 ef e8 f3 77 ff RSP: 0018:ffff88811b2099b0 EFLAGS: 00010206 RAX: ffff888111197000 RBX: 0000000000000000 RCX: ffffffff82fbc609 RDX: 0000000000000100 RSI: ffffffff82fbc616 RDI: 0000000000000001 RBP: ffff8881111bc800 R08: ffff888111197000 R09: ffffed10222a82af R10: ffff888111541577 R11: ffffed10222a82ae R12: 1ffff11023641336 R13: ffff888111541000 R14: ffff88810fd4ca00 R15: ffff888111541570 tcp_child_process+0x754/0x920 net/ipv4/tcp_minisocks.c:841 tcp_v4_do_rcv+0x749/0x8b0 net/ipv4/tcp_ipv4.c:1642 tcp_v4_rcv+0x2666/0x2e60 net/ipv4/tcp_ipv4.c:1999 ip_protocol_deliver_rcu+0x29/0x1f0 net/ipv4/ip_input.c:204 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline] NF_HOOK include/linux/netfilter.h:421 [inline] ip_local_deliver+0x2da/0x390 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:441 [inline] ip_rcv_finish net/ipv4/ip_input.c:428 [inline] ip_rcv_finish net/ipv4/ip_input.c:414 [inline] NF_HOOK include/linux/netfilter.h:421 [inline] ip_rcv+0xef/0x140 net/ipv4/ip_input.c:539 __netif_receive_skb_one_core+0x197/0x1e0 net/core/dev.c:5268 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5382 process_backlog+0x1e5/0x6d0 net/core/dev.c:6226 napi_poll net/core/dev.c:6671 [inline] net_rx_action+0x3e3/0xd70 net/core/dev.c:6739 __do_softirq+0x18c/0x634 kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 </IRQ> do_softirq.part.0+0x26/0x30 kernel/softirq.c:337 do_softirq arch/x86/include/asm/preempt.h:26 [inline] __local_bh_enable_ip+0x46/0x50 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:723 [inline] ip_finish_output2+0x78a/0x19c0 net/ipv4/ip_output.c:229 __ip_finish_output+0x471/0x720 net/ipv4/ip_output.c:306 dst_output include/net/dst.h:435 [inline] ip_local_out+0x181/0x1e0 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x7a1/0x14e0 net/ipv4/ip_output.c:530 __tcp_transmit_skb+0x19dc/0x35e0 net/ipv4/tcp_output.c:1238 __tcp_send_ack.part.0+0x3c2/0x5b0 net/ipv4/tcp_output.c:3785 __tcp_send_ack net/ipv4/tcp_output.c:3791 [inline] tcp_send_ack+0x7d/0xa0 net/ipv4/tcp_output.c:3791 tcp_rcv_synsent_state_process net/ipv4/tcp_input.c:6040 [inline] tcp_rcv_state_process+0x36a4/0x49c2 net/ipv4/tcp_input.c:6209 tcp_v4_do_rcv+0x343/0x8b0 net/ipv4/tcp_ipv4.c:1651 sk_backlog_rcv include/net/sock.h:996 [inline] __release_sock+0x1ad/0x310 net/core/sock.c:2548 release_sock+0x54/0x1a0 net/core/sock.c:3064 inet_wait_for_connect net/ipv4/af_inet.c:594 [inline] __inet_stream_connect+0x57e/0xd50 net/ipv4/af_inet.c:686 inet_stream_connect+0x53/0xa0 net/ipv4/af_inet.c:725 mptcp_stream_connect+0x171/0x5f0 net/mptcp/protocol.c:1920 __sys_connect_file net/socket.c:1854 [inline] __sys_connect+0x267/0x2f0 net/socket.c:1871 __do_sys_connect net/socket.c:1882 [inline] __se_sys_connect net/socket.c:1879 [inline] __x64_sys_connect+0x6f/0xb0 net/socket.c:1879 do_syscall_64+0xb7/0x3d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fb577d06469 Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d ff 49 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007fb5783d5dd8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 000000000068bfa0 RCX: 00007fb577d06469 RDX: 000000000000004d RSI: 0000000020000040 RDI: 0000000000000003 RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000041427c R14: 00007fb5783d65c0 R15: 0000000000000003 Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/39Reported-by:
Christoph Paasch <cpaasch@apple.com> Fixes: e1ff9e82 ("net: mptcp: improve fallback to TCP") Suggested-by:
Paolo Abeni <pabeni@redhat.com> Signed-off-by:
Davide Caratti <dcaratti@redhat.com> Reviewed-by:
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Alexander A. Klimov authored
Rationale: Reduces attack surface on kernel devs opening the links for MITM as HTTPS traffic is much harder to manipulate. Deterministic algorithm: For each file: If not .svg: For each line: If doesn't contain `\bxmlns\b`: For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`: If both the HTTP and HTTPS versions return 200 OK and serve the same content: Replace HTTP with HTTPS. Signed-off-by:Alexander A. Klimov <grandmaster@al2klimov.de> Signed-off-by:
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David S. Miller authored
Alexander Lobakin says: ==================== net: qed/qede: W=1 C=1 warnings cleanup This set cleans qed/qede build log under W=1 C=1 with GCC 8 and sparse 0.6.2. The only thing left is "context imbalance -- unexpected unlock" in one of the source files, which will be issued later during the refactoring cycles. The biggest part is handling the endianness warnings. The current code often just assumes that both host and device operate in LE, which is obviously incorrect (despite the fact that it's true for x86 platforms), and makes sparse {s,m}ad. The rest of the series is mostly random non-functional fixes here-and-there. ==================== Signed-off-by: -
Alexander Lobakin authored
Flow Dissector's keys are mostly Network / Big Endian. U{16,32}_MAX are the same in either of byteorders, but let's make sparse happy with wrapping them into noops. Signed-off-by:Alexander Lobakin <alobakin@marvell.com> Signed-off-by:
Igor Russkikh <irusskikh@marvell.com> Signed-off-by:
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Alexander Lobakin authored
One of the function arguments was renamed some time ago, but this wasn't reflected in its kernel-doc comment. Also add the description for return values. Signed-off-by:
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Alexander Lobakin authored
Current code assumes that both host and device operates in Little Endian in lots of places. While this is true for x86 platform, this doesn't mean we should not care about this. This commit addresses all parts of the code that were pointed out by sparse checker. All operations with restricted (__be*/__le*) types are now protected with explicit from/to CPU conversions, even if they're noops on common setups. I'm sure there are more such places, but this implies a deeper code investigation, and is a subject for future works. Signed-off-by:
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Alexander Lobakin authored
Use intermediate pointers instead of multiple dereferencing to simplify and beautify parts of code that will be addressed in the next commit. Signed-off-by:
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Alexander Lobakin authored
To not mix functional and stylistic changes, correct indentation of code that will be modified in the subsequent commits. Signed-off-by:
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Alexander Lobakin authored
Get rid of the kernel-doc warnings when building with W=1+ by rewriting the problematic doc comments according to the recommended format and style. Note that this only fixes problems found in C source files, headers aren't in scope for now. Signed-off-by:
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Alexander Lobakin authored
Change the prototype of qed_hw_err_notify() with the following: * constify "fmt" argument according to printk() declarations; * anontate it with __cold attribute to move the function out of the line; * annotate it with __printf() attribute; This eliminates W=1+ warning: drivers/net/ethernet/qlogic/qed/qed_hw.c: In function ‘qed_hw_err_notify’: drivers/net/ethernet/qlogic/qed/qed_hw.c:851:3: warning: function ‘qed_hw_err_notify’ might be a candidate for ‘gnu_printf’ format attribute [-Wsuggest-attribute=format] len = vsnprintf(buf, QED_HW_ERR_MAX_STR_SIZE, fmt, vl); ^~~ as well as saves some code size: add/remove: 0/0 grow/shrink: 2/4 up/down: 40/-125 (-85) Function old new delta qed_dmae_execute_command 1680 1711 +31 qed_spq_post 1104 1113 +9 qed_int_sp_dpc 3554 3545 -9 qed_mcp_cmd_and_union 1896 1876 -20 qed_hw_err_notify 395 352 -43 qed_mcp_handle_events 2630 2577 -53 Total: Before=368645, After=368560, chg -0.02% __printf() will also be helpful with catching bad format strings and arguments. Signed-off-by:
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Alexander Lobakin authored
Fix several sparse warnings by moving structs declarations into the corresponding header files: drivers/net/ethernet/qlogic/qed/qed_dcbx.c:2402:32: warning: symbol 'qed_dcbnl_ops_pass' was not declared. Should it be static? drivers/net/ethernet/qlogic/qed/qed_ll2.c:2754:26: warning: symbol 'qed_ll2_ops_pass' was not declared. Should it be static? drivers/net/ethernet/qlogic/qed/qed_ptp.c:449:30: warning: symbol 'qed_ptp_ops_pass' was not declared. Should it be static? drivers/net/ethernet/qlogic/qed/qed_sriov.c:5265:29: warning: symbol 'qed_iov_ops_pass' was not declared. Should it be static? (some of them were declared twice in different header files) Also make qed_hw_err_type_descr[] const while at it. Signed-off-by:
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Alexander Lobakin authored
Static variables (and functions, unless they're inline) should not be declared in header files. Move the static array iro_arr[] from "qed_hsi.h" to the sole place where it's used, "qed_init_ops.c". This eliminates lots of warnings (42 of them actually) against W=1+: In file included from drivers/net/ethernet/qlogic/qed/qed.h:51:0, from drivers/net/ethernet/qlogic/qed/qed_ooo.c:40: drivers/net/ethernet/qlogic/qed/qed_hsi.h:4421:18: warning: 'iro_arr' defined but not used [-Wunused-const-variable=] static const u32 iro_arr[] = { ^~~~~~~ Signed-off-by: -
Sabrina Dubroca authored
This patch adds a new structure geneve_config and moves the per-device configuration attributes to it, like we already have in VXLAN with struct vxlan_config. This ends up being pretty invasive since those attributes are used everywhere. This allows us to clean up the argument lists for geneve_configure (4 arguments instead of 8) and geneve_nl2info (5 instead of 9). This also reduces the copy-paste of code setting those attributes between geneve_configure and geneve_changelink to a single memcpy, which would have avoided the bug fixed in commit 56c09de3 ("geneve: allow changing DF behavior after creation"). Signed-off-by:
Sabrina Dubroca <sd@queasysnail.net> Signed-off-by:
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Ioana Ciornei authored
On link down, the draining of the S/G cache should be done on all _possible_ CPUs not just the ones that are online in that moment. Fix this by changing the iterator. Fixes: d70446ee ("dpaa2-eth: send a scatter-gather FD instead of realloc-ing") Reported-by:
Ioana Ciornei <ioana.ciornei@nxp.com> Signed-off-by:
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Tang Bin authored
The variable 'err = -ENODEV;' in au1000_probe() is duplicate, so remove redundant one. And remove the extra blank lines in the file au1000_eth.c Signed-off-by:
Zhang Shengju <zhangshengju@cmss.chinamobile.com> Signed-off-by:
Tang Bin <tangbin@cmss.chinamobile.com> Signed-off-by:
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Matthieu Baerts authored
When investigating performance issues that involve latency / loss / reordering it is useful to have the pcap from the sender-side as it allows to easier infer the state of the sender's congestion-control, loss-recovery, etc. Allow the selftests to capture a pcap on both sender and receiver so that this information is not lost when reproducing. This patch also improves the file names. Instead of: ns4-5ee79a56-X4O6gS-ns3-5ee79a56-X4O6gS-MPTCP-MPTCP-10.0.3.1.pcap We now have something like for the same test: 5ee79a56-X4O6gS-ns3-ns4-MPTCP-MPTCP-10.0.3.1-10030-connector.pcap 5ee79a56-X4O6gS-ns3-ns4-MPTCP-MPTCP-10.0.3.1-10030-listener.pcap It was a connection from ns3 to ns4, better to start with ns3 then. The port is also added, easier to find the trace we want. Co-developed-by:
Matthieu Baerts <matthieu.baerts@tessares.net> Signed-off-by:
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David S. Miller authored
Vaibhav Gupta says: ==================== ethernet: sun: use generic power management Linux Kernel Mentee: Remove Legacy Power Management. The purpose of this patch series is to remove legacy power management callbacks from sun ethernet drivers. The callbacks performing suspend() and resume() operations are still calling pci_save_state(), pci_set_power_state(), etc. and handling the power management themselves, which is not recommended. The conversion requires the removal of the those function calls and change the callback definition accordingly and make use of dev_pm_ops structure. All patches are compile-tested only. ==================== Signed-off-by: -
Vaibhav Gupta authored
With legacy PM, drivers themselves were responsible for managing the device's power states and takes care of register states. After upgrading to the generic structure, PCI core will take care of required tasks and drivers should do only device-specific operations. Compile-tested only. Signed-off-by:
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Vaibhav Gupta authored
With legacy PM, drivers themselves were responsible for managing the device's power states and takes care of register states. After upgrading to the generic structure, PCI core will take care of required tasks and drivers should do only device-specific operations. The driver was calling pci_save/restore_state() which is no more needed. Compile-tested only. Signed-off-by:
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Vaibhav Gupta authored
With legacy PM, drivers themselves were responsible for managing the device's power states and takes care of register states. And they use PCI helper functions to do it. After upgrading to the generic structure, PCI core will take care of required tasks and drivers should do only device-specific operations. In this driver: gem_suspend() calls gem_do_stop() which in turn invokes pci_disable_device(). As the PCI helper function is not called at the end/start of the function body, breaking the function in two parts may change its behavior. The only other function invoking gem_do_stop() is gem_close(). Hence, gem_close() and gem_suspend() can do the required end steps on their own. The same case is with gem_resume(). Both gem_resume() and gem_open() invoke gem_do_start(). Again, make the caller functions do the required steps on their own. Compile-tested only. Signed-off-by:
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- 05 Jul, 2020 3 commits
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Andrew Lunn authored
The comments before struct vsc73xx_platform and struct vsc73xx_spi use kerneldoc format, but then fail to document the members of these structures. All the structure members are self evident, and the driver has not other kerneldoc comments, so change these to plain comments to avoid warnings. Signed-off-by:
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Andrew Lunn authored
Since lan9303_adjust_link() is a void function, there is no option to return an error. So just remove the variable and lets any errors be discarded. Cc: Egil Hjelmeland <privat@egil-hjelmeland.no> Signed-off-by:
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Andrew Lunn authored
Oddly, GENMASK() requires signed bit numbers, so that it can compare them for < 0. If passed an unsigned type, we get warnings about the test never being true. Signed-off-by:
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