- 12 Jan, 2017 12 commits
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Xinming Hu authored
__mwifiex_sdio_remove helper is not needed after our enhancements in SDIO card reset. Signed-off-by:
Xinming Hu <huxm@marvell.com> Signed-off-by:
Amitkumar Karwar <akarwar@marvell.com> Signed-off-by:
Kalle Valo <kvalo@codeaurora.org>
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Xinming Hu authored
Commit b4336a28 ("mwifiex: sdio: reset adapter using mmc_hw_reset") introduces a simple sdio card reset solution based on card remove and re-probe. This solution has proved to be vulnerable, as card and adapter structures are not protected, concurrent access will result in kernel panic issues. Let's reuse PCIe FLR's functions for SDIO reset to avoid freeing and reallocating adapter and card structures. Signed-off-by:
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Xinming Hu authored
adapter and card variables don't get freed during PCIe function level reset. "adapter->ext_scan" variable need not be re-initialized. fw_name and tx_buf_size initialization is moved to pcie specific code so that mwifiex_reinit_sw() can be used by SDIO. Signed-off-by:
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Xinming Hu authored
This patch gets rid of mwifiex_do_flr. We will call mwifiex_shutdown_sw() and mwifiex_reinit_sw() directly. These two general purpose functions will be useful for sdio card reset handler. Signed-off-by:
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Amitkumar Karwar authored
After user_rmmod global flag removal, *_init_module() and *_cleanup_module() have become just a wrapper functions. We will get rid of them with the help of module_*_driver() macros. For pcie, existing ".init_if" handler has same name as what module_pcie_driver() macro will create. Let's rename it to avoid conflict. Signed-off-by:
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Xinming Hu authored
bus.remove() callback function is called when user removes this module from kernel space or ejects the card from the slot. The driver handles these 2 cases differently. Few commands (FUNC_SHUTDOWN etc.) are sent to the firmware only for module unload case. The variable 'user_rmmod' is used to distinguish between these two scenarios. This patch checks hardware status and get rid of global variable user_rmmod. Signed-off-by:
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Xinming Hu authored
Next patch in this series is going to use mwifiex_read_reg() in remove handlers. The changes here are prerequisites to avoid forward declarations. Signed-off-by:
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Ganapathi Bhat authored
Currently pcie_work and related variables are global. It may create problem while supporting multiple devices simultaneously. Let's move it inside card structure so that separate instance will be created/ cancelled in init/teardown threads of each connected devices. Signed-off-by:
Ganapathi Bhat <gbhat@marvell.com> Signed-off-by:
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Xinming Hu authored
Wait for firmware dump complete in card remove function. For sdio interface, there are two diffenrent cases, card reset trigger sdio_work and firmware dump trigger sdio_work. Do code rearrangement for distinguish between these two cases. Signed-off-by:
Brian Norris <briannorris@chromium.org> Signed-off-by:
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Xinming Hu authored
We can avoid drv_info_dump and drv_info_size adapter variables. This info can be passed to mwifiex_upload_device_dump() as parameters Signed-off-by:
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Xinming Hu authored
mwifiex_upload_device_dump() already takes care of freeing firmware dump memory. Doing the same thing in mwifiex_shutdown_drv() is redundant. Signed-off-by:
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Xinming Hu authored
main_process is not expected to be running when shutdown_drv function is called. currently we wait for main_process completion in the function. Actually the caller has already made sure main_process is completed by performing below actions. (1) disable interrupts in if_ops->disable_int. (2) set adapter->surprise_removed = true, main_process wont be queued. (3) mwifiex_terminate_workqueue(adapter), wait for workqueue to be completed. This patch removes redundant wait code and takes care of related cleanup. Signed-off-by:
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- 11 Jan, 2017 4 commits
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Sowmini Varadhan authored
Commit 7f953ab2 ("af_packet: TX_RING support for TPACKET_V3") now makes it possible to use TX_RING with TPACKET_V3, so make the the relevant information available via 'ss -e -a --packet' Signed-off-by:
Sowmini Varadhan <sowmini.varadhan@oracle.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Tobias Klauser authored
Make the functions __local_list_pop_free(), __local_list_pop_pending(), bpf_common_lru_populate() and bpf_percpu_lru_populate() static as they are not used outide of bpf_lru_list.c This fixes the following GCC warnings when building with 'W=1': kernel/bpf/bpf_lru_list.c:363:22: warning: no previous prototype for ‘__local_list_pop_free’ [-Wmissing-prototypes] kernel/bpf/bpf_lru_list.c:376:22: warning: no previous prototype for ‘__local_list_pop_pending’ [-Wmissing-prototypes] kernel/bpf/bpf_lru_list.c:560:6: warning: no previous prototype for ‘bpf_common_lru_populate’ [-Wmissing-prototypes] kernel/bpf/bpf_lru_list.c:577:6: warning: no previous prototype for ‘bpf_percpu_lru_populate’ [-Wmissing-prototypes] Cc: Martin KaFai Lau <kafai@fb.com> Signed-off-by:
Tobias Klauser <tklauser@distanz.ch> Acked-by:
Alexei Starovoitov <ast@kernel.org> Acked-by:
Martin KaFai Lau <kafai@fb.com> Signed-off-by:
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Tobias Klauser authored
Remove the unused but set variable 'first_node' in __bpf_lru_list_shrink_inactive() to fix the following GCC warning when building with 'W=1': kernel/bpf/bpf_lru_list.c:216:41: warning: variable ‘first_node’ set but not used [-Wunused-but-set-variable] Cc: Martin KaFai Lau <kafai@fb.com> Signed-off-by:
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Mahesh Bandewar authored
The patch 009146d1 ("ipvlan: assign unique dev-id for each slave device.") used ida_simple_get() to generate dev_ids assigned to the slave devices. However (Eric has pointed out that) there is a shortcoming with that approach as it always uses the first available ID. This becomes a problem when a slave gets deleted and a new slave gets added. The ID gets reassigned causing the new slave to get the same link-local address. This side-effect is undesirable. This patch adds a per-port variable that keeps track of the IDs assigned and used as the stat-base for the IDR api. This base will be wrapped around when it reaches the MAX (0xFFFE) value possibly on a busy system where slaves are added and deleted routinely. Fixes: 009146d1 ("ipvlan: assign unique dev-id for each slave device.") Signed-off-by:
Mahesh Bandewar <maheshb@google.com> CC: Eric Dumazet <edumazet@google.com> CC: David Miller <davem@davemloft.org> Signed-off-by:
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- 10 Jan, 2017 6 commits
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Prasad Kanneganti authored
Store the L4 hash of received packets in the skb; the hash is computed in the NIC firmware. Signed-off-by:
Prasad Kanneganti <prasad.kanneganti@cavium.com> Signed-off-by:
Felix Manlunas <felix.manlunas@cavium.com> Signed-off-by:
Derek Chickles <derek.chickles@cavium.com> Signed-off-by:
Satanand Burla <satananda.burla@cavium.com> Signed-off-by:
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David S. Miller authored
Edward Cree says: ==================== sfc: physical port ids This series brings our handling of ndo_get_phys_port_id and related interfaces into line with the behaviour of other drivers. ==================== Signed-off-by: -
Bert Kenward authored
Setting dev_port changes the device names allocated by systemd. Any devices with a dev_port >0 will (in default distro configurations) have a suffix of "d<port-number>" appended. This is not something done by other drivers, and causes confusion for users. Fixes: 8be41320 ("sfc: Add code to export port_num in netdev->dev_port") Signed-off-by:
Edward Cree <ecree@solarflare.com> Signed-off-by:
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Bert Kenward authored
Output is of the form p<port-number>. Note that the port numbers don't necessarily map one-to-one to physical cages, partly because of 4x10G port modes on QSFP+ and partly because of hw/fw implementation details. Signed-off-by:
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Bert Kenward authored
There's no good reason why this should be an SRIOV-only thing. Thus, also move it out of SRIOV-specific files. Signed-off-by:
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Timur Tabi authored
Add support for some ethtool methods: get/set link settings, get/set message level, get statistics, get link status, get ring params, get pause params, and restart autonegotiation. The code to collect the hardware statistics is moved into its own function so that it can be used by "get statistics" method. Signed-off-by:
Timur Tabi <timur@codeaurora.org> Signed-off-by:
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- 09 Jan, 2017 18 commits
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Vivien Didelot authored
The support for DSA Ethernet switch chips depends on TCP/IP networking, thus explicit that HAVE_NET_DSA depends on INET. DSA uses SWITCHDEV, thus select it instead of depending on it. Signed-off-by:
Vivien Didelot <vivien.didelot@savoirfairelinux.com> Reviewed-by:
Andrew Lunn <andrew@lunn.ch> Reviewed-by:
Florian Fainelli <f.fainelli@gmail.com> Tested-by:
Randy Dunlap <rdunlap@infradead.org> Signed-off-by:
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git://git.kernel.org/pub/scm/linux/kernel/git/mellanox/linuxDavid S. Miller authored
Saeed Mahameed says: ==================== mlx5 4K UAR The following series of patches optimizes the usage of the UAR area which is contained within the BAR 0-1. Previous versions of the firmware and the driver assumed each system page contains a single UAR. This patch set will query the firmware for a new capability that if published, means that the firmware can support UARs of fixed 4K regardless of system page size. In the case of powerpc, where page size equals 64KB, this means we can utilize 16 UARs per system page. Since user space processes by default consume eight UARs per context this means that with this change a process will need a single system page to fulfill that requirement and in fact make use of more UARs which is better in terms of performance. In addition to optimizing user-space processes, we introduce an allocator that can be used by kernel consumers to allocate blue flame registers (which are areas within a UAR that are used to write doorbells). This provides further optimization on using the UAR area since the Ethernet driver makes use of a single blue flame register per system page and now it will use two blue flame registers per 4K. The series also makes changes to naming conventions and now the terms used in the driver code match the terms used in the PRM (programmers reference manual). Thus, what used to be called UUAR (micro UAR) is now called BFREG (blue flame register). In order to support compatibility between different versions of library/driver/firmware, the library has now means to notify the kernel driver that it supports the new scheme and the kernel can notify the library if it supports this extension. So mixed versions of libraries can run concurrently without any issues. ==================== Signed-off-by: -
Eric Dumazet authored
tcp_get_info() has to lock the socket, so lets lock it for an extended critical section, so that various fields have consistent values. This solves an annoying issue that some applications reported when multiple counters are updated during one particular rx/rx event, and TCP_INFO was called from another cpu. Signed-off-by:
Eric Dumazet <edumazet@google.com> Cc: Yuchung Cheng <ycheng@google.com> Signed-off-by:
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David S. Miller authored
Alexei Starovoitov says: ==================== bpf: verifier improvements A number of bpf verifier improvements from Gianluca. See individual patches for details. ==================== Signed-off-by: -
Alexei Starovoitov authored
since ARG_PTR_TO_STACK is no longer just pointer to stack rename it to ARG_PTR_TO_MEM and adjust comment. Signed-off-by:
Daniel Borkmann <daniel@iogearbox.net> Signed-off-by:
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Gianluca Borello authored
Currently, helpers that read and write from/to the stack can do so using a pair of arguments of type ARG_PTR_TO_STACK and ARG_CONST_STACK_SIZE. ARG_CONST_STACK_SIZE accepts a constant register of type CONST_IMM, so that the verifier can safely check the memory access. However, requiring the argument to be a constant can be limiting in some circumstances. Since the current logic keeps track of the minimum and maximum value of a register throughout the simulated execution, ARG_CONST_STACK_SIZE can be changed to also accept an UNKNOWN_VALUE register in case its boundaries have been set and the range doesn't cause invalid memory accesses. One common situation when this is useful: int len; char buf[BUFSIZE]; /* BUFSIZE is 128 */ if (some_condition) len = 42; else len = 84; some_helper(..., buf, len & (BUFSIZE - 1)); The compiler can often decide to assign the constant values 42 or 48 into a variable on the stack, instead of keeping it in a register. When the variable is then read back from stack into the register in order to be passed to the helper, the verifier will not be able to recognize the register as constant (the verifier is not currently tracking all constant writes into memory), and the program won't be valid. However, by allowing the helper to accept an UNKNOWN_VALUE register, this program will work because the bitwise AND operation will set the range of possible values for the UNKNOWN_VALUE register to [0, BUFSIZE), so the verifier can guarantee the helper call will be safe (assuming the argument is of type ARG_CONST_STACK_SIZE_OR_ZERO, otherwise one more check against 0 would be needed). Custom ranges can be set not only with ALU operations, but also by explicitly comparing the UNKNOWN_VALUE register with constants. Another very common example happens when intercepting system call arguments and accessing user-provided data of variable size using bpf_probe_read(). One can load at runtime the user-provided length in an UNKNOWN_VALUE register, and then read that exact amount of data up to a compile-time determined limit in order to fit into the proper local storage allocated on the stack, without having to guess a suboptimal access size at compile time. Also, in case the helpers accepting the UNKNOWN_VALUE register operate in raw mode, disable the raw mode so that the program is required to initialize all memory, since there is no guarantee the helper will fill it completely, leaving possibilities for data leak (just relevant when the memory used by the helper is the stack, not when using a pointer to map element value or packet). In other words, ARG_PTR_TO_RAW_STACK will be treated as ARG_PTR_TO_STACK. Signed-off-by:
Gianluca Borello <g.borello@gmail.com> Acked-by:
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Gianluca Borello authored
commit 48461135 ("bpf: allow access into map value arrays") introduces the ability to do pointer math inside a map element value via the PTR_TO_MAP_VALUE_ADJ register type. The current support doesn't handle the case where a PTR_TO_MAP_VALUE_ADJ is spilled into the stack, limiting several use cases, especially when generating bpf code from a compiler. Handle this case by explicitly enabling the register type PTR_TO_MAP_VALUE_ADJ to be spilled. Also, make sure that min_value and max_value are reset just for BPF_LDX operations that don't result in a restore of a spilled register from stack. Signed-off-by:
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Gianluca Borello authored
Enable helpers to directly access a map element value by passing a register type PTR_TO_MAP_VALUE (or PTR_TO_MAP_VALUE_ADJ) to helper arguments ARG_PTR_TO_STACK or ARG_PTR_TO_RAW_STACK. This enables several use cases. For example, a typical tracing program might want to capture pathnames passed to sys_open() with: struct trace_data { char pathname[PATHLEN]; }; SEC("kprobe/sys_open") void bpf_sys_open(struct pt_regs *ctx) { struct trace_data data; bpf_probe_read(data.pathname, sizeof(data.pathname), ctx->di); /* consume data.pathname, for example via * bpf_trace_printk() or bpf_perf_event_output() */ } Such a program could easily hit the stack limit in case PATHLEN needs to be large or more local variables need to exist, both of which are quite common scenarios. Allowing direct helper access to map element values, one could do: struct bpf_map_def SEC("maps") scratch_map = { .type = BPF_MAP_TYPE_PERCPU_ARRAY, .key_size = sizeof(u32), .value_size = sizeof(struct trace_data), .max_entries = 1, }; SEC("kprobe/sys_open") int bpf_sys_open(struct pt_regs *ctx) { int id = 0; struct trace_data *p = bpf_map_lookup_elem(&scratch_map, &id); if (!p) return; bpf_probe_read(p->pathname, sizeof(p->pathname), ctx->di); /* consume p->pathname, for example via * bpf_trace_printk() or bpf_perf_event_output() */ } And wouldn't risk exhausting the stack. Code changes are loosely modeled after commit 6841de8b ("bpf: allow helpers access the packet directly"). Unlike with PTR_TO_PACKET, these changes just work with ARG_PTR_TO_STACK and ARG_PTR_TO_RAW_STACK (not ARG_PTR_TO_MAP_KEY, ARG_PTR_TO_MAP_VALUE, ...): adding those would be trivial, but since there is not currently a use case for that, it's reasonable to limit the set of changes. Also, add new tests to make sure accesses to map element values from helpers never go out of boundary, even when adjusted. Signed-off-by: -
Gianluca Borello authored
Move the logic to check memory accesses to a PTR_TO_MAP_VALUE_ADJ from check_mem_access() to a separate helper check_map_access_adj(). This enables to use those checks in other parts of the verifier as well, where boundaries on PTR_TO_MAP_VALUE_ADJ might need to be checked, for example when checking helper function arguments. The same thing is already happening for other types such as PTR_TO_PACKET and its check_packet_access() helper. The code has been copied verbatim, with the only difference of removing the "off += reg->max_value" statement and moving the sum into the call statement to check_map_access(), as that was only needed due to the earlier common check_map_access() call. Signed-off-by:
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David S. Miller authored
Ursula Braun says: ==================== net/smc: Shared Memory Communications - RDMA here is now V4 of the SMC-R patches having processed your feedback from end of November. The most important change is the replacement of sysfs by a generic netlink solution in patch 04. And I tried to get rid of the __packed attributes. There are still a few usages left due to SMC-R protocol defined structures. V4 changes: The order of patches 03 and 04 for pnet table management and SMC IB-client establishing has been exchanged, since pnet table management is now built on top of smc_ib_devices. Patch 01: Use EXPORT_SYMBOL_GPL(). Patch 02: Define "use_fallback" as bool. Get rid of useless smc_sock fields clearing in smc_sock_alloc(), since sk_alloc() clears out the memory. Patch 03: Postpone smc_ib_remember_port_attr() call till ib_device is mentioned in the pnet table. Patch 04: Replace sysfs-usage by a generic netlink approach for pnet table configuration. Change layout of pnet table entries to reference net_device and ib_device instead of dealing with names of net_devices and ib_devices. Patch 05: Adapt "use_fallback" usages to new type bool. Get rid of useless smc_sock fields clearing in smc_sock_alloc() Avoid __packed where possible. Check if clc responses are not too big. Patch 09: Postpone smc_setup_per_ibdev till the first connection with this ib_device is really created. Patch 11: Get rid of __packed usage. V3 changes: Patch 05: Remove unneeded DEFINE_WAIT Patch 06: Improve synchronization of link group creation Patch 07: Rename peer_rmbe_len into peer_rmbe_size to be more consistent Patch 09: Avoid calls of ib_get_memory_region with IB_ACCESS_LOCAL_WRITE, use new default local_dma_lkey from protection domain as lkey instead. Remove no longer needed function smc_ib_dereg_memory_region(). Patch 14: Switch to state ACTIVE only if still in state INIT. Return 0 for recvmsg invoked in a socket closing state. Allow getname call in state APPCLOSEWAIT1 Do not trigger destruction of a socket-in-error queued in accept queue. During cleanup of accept queue, make sure sockets are destructed, and sockets in fallback mode are handled appropriately. When freeing sndbufs/rmbs, remove them from their list and free the entry. Use add_wait_queue() and remove_wait_queue() in close wait functions. If actively closing a socket in state for PEERFINCLOSEWAIT, keep this state. If passively closing a socket while bytes are to be received, move to state APPCLOSEWAIT1. If actively aborting a socket, skip sending the close_abort flag, since RDMA communication is no longer possible. When terminating a link group, do not schedule link group freeing a 2nd time, since already done when unregistering the last remaining connection. Patch 15: Introduce smc_diag module for monitoring SMC protocol sockets. This replaces the old patch 0015 dealing with procfs. V2 changes: Patch 0002: Add SMC versions for family key strings in net/core/sock.c. Patch 0006: initialize rb_tree. Patch 0007: Get rid of unneeded use of xchg() in smc_sndbuf_unuse() and smc_rmb_unuse(). Patch 0008: Correct error checking logic for ib_function calls. Define struct smc_link field wr_tx_id as atomic_long_t. Use "do_div" instead of "%" to be architecture-independent. Patch 0009: Correct error checking logic for ib_function calls. Patch 0011: Remove xchg() calls in cursor handling. Use atomic64_t for cursor overlays on 64-bit architectures. If not available, use plain u64 and add locking for cursor reading and writing. Implement smc_curs_add() without modulo operator "%". Patch 0012: Remove xchg() calls in cursor handling. Implement smc_tx_rdma_writes() without module operator "%". Patch 0013: Remove xchg() calls in cursor handling. Patch 0014: Return type bool in smc_wr_tx_has_pending(). Remove unneeded semicolon in smc_close_shutdown_write(). Call smc_close_active() in non-fallback case only. Get rid of duplicate schedule of sock_put_work(). Take nested sock_lock in smc_listen_work(). Start close stream_wait in case of prepared sends only. Patch 0015: Remove unneeded socket ref_count in smc_proc_seq_show(). Take lock before list_empty check in smc_proc_sock_list_del(). These patches are the initial part of the implementation of the "Shared Memory Communications-RDMA" (SMC-R) protocol as defined in RFC7609 [1]. While SMC-R does not aim to replace TCP, it taps a wealth of existing data center TCP socket applications to become more efficient without the need for rewriting them. SMC-R uses RDMA over Converged Ethernet (RoCE) to save CPU consumption. For instance, when running 10 parallel connections with uperf, we measured a decrease of 60% in CPU consumption with SMC-R compared to TCP/IP (with throughput and latency comparable; measured on x86_64 with the same RoCE card and port). SMC-R does not require an RDMA communication manager (RDMA CM). SMC-R inherits TCP qualities such as reliable connections, host-based firewall packet filtering (on connection establishment) and unmodified application of communication encryption such as TLS (transport layer security) or SSL (secure sockets layer). Since original TCP is used to establish SMC-R connections, load balancers and packet inspection based on TCP/IP connection establishment continue to work for SMC-R. On the other hand, using SMC-R implies: - either involving a preload library when invoking the unchanged TCP-application or slightly modifying the source by simply changing the socket family in the socket() call - accepting extra overhead and latency in connection establishment due to SMC Connection Layer Control (CLC) handshake - explicit coupling of RoCE ports with Ethernet ports - not routable as currently built on RoCE V1 - bypassing of packet-based networking features - filtering (netfilter) - sniffing (libpcap, packet sockets, (E)BPF) - traffic control (scheduling, shaping) - bypassing of IP-header based socket options - bypassing of memory buffer (pressure) management - unusable together with IPsec Overview of the SMC-R Protocol described in informational RFC 7609 SMC-R is an open protocol that provides RDMA capabilities over RoCE transparently for applications exploiting TCP sockets. A new socket protocol family PF_SMC is introduced. There are no changes required to applications using the sockets API for TCP stream sockets other than the specification of the new socket family AF_SMC. Unmodified applications can be used by means of a dynamic preload shared library which rewrites the socket API call socket(AF_INET, SOCK_STREAM, IPPROTO_TCP) into socket(AF_SMC, SOCK_STREAM, IPPROTO_TCP). SMC-R re-uses the address family AF_INET for all addressing purposes around struct sockaddr. SMC-R system architecture layers: +=============================================================================+ | | unmodified TCP application | | native SMC application +--------------------------------------+ | | dynamic preload shared library | +=============================================================================+ | SMC socket | +-----------------------------------------------------------------------------+ | | TCP socket (for connection establishment and fallback) | | IB verbs +--------------------------------------------------------+ | | IP | +--------------------+--------------------------------------------------------+ | RoCE device driver | some network device driver | +=============================================================================+ Terms: A link group is determined by an ordered peer pair of TCP client and TCP server (IP addresses and subnet). Reversed client server roles cause an own link group. A link is a logical point-to-point connection based on an infiniband reliable connected queue pair (RC-QP) between two RoCE ports (MACs and GIDs) of a peer pair. A link group can have 1..8 links for failover and load balancing. This initial Linux implementation always has 1 link per link group. Each link group on a peer can have 1..255 remote memory buffers (RMBs). If more RMBs are needed, a peer can open another link group (this initial Linux implementation) or fall back to TCP. Each RMB has its own particular size and its own (R)DMA mapping and credentials (rtoken consisting of rkey and RDMA "virtual address"). This initial Linux implementation uses physically contiguous memory for RMBs but we are working towards scattered memory because of memory fragmentation. Each RMB has 1..255 RMB elements (RMBEs) of equal size to provide multiplexing of connections within an RMB. An RMBE is the RDMA Write destination organized as wrapping ring buffer for data transmit of a particular connection in one direction (duplex by means of mirror symmetry as with TCP). This initial Linux implementation always has 1 RMBE per RMB and thus an individual RMB for each connection. SMC-R connection establishment with subsequent data transfer: CLIENT SERVER TCP three-way handshake: regular TCP SYN --------------------------------------------------------> regular TCP SYN ACK <-------------------------------------------------------- regular TCP ACK --------------------------------------------------------> SMC Connection Layer Control (CLC) handshake exchanges RDMA credentials between peers: via above TCP connection: SMC CLC Proposal --------------------------------------------------------> via above TCP connection: SMC CLC Accept <-------------------------------------------------------- via above TCP connection: SMC CLC Confirm --------------------------------------------------------> SMC Link Layer Control (LLC) (only once per link, i.e. 1st conn. of link group): RoCE RC-QP: SMC LLC Confirm Link <======================================================== RoCE RC-QP: SMC LLC Confirm Link response ========================================================> SMC data transmission (incl. SMC Connection Data Control (CDC) message): RoCE RC-QP: RDMA Write ========================================================> RoCE RC-QP: SMC CDC message (flow control) ========================================================> ... RoCE RC-QP: RDMA Write <======================================================== RoCE RC-QP: SMC CDC message (flow control) <======================================================== ... Data flow within an established connection: +---------------------------------------------------------------------------- | SENDER | sendmsg() | | | | produces into sndbuf [sender's process context] | v | +--------+ | | sndbuf | [ring buffer] | +--------+ | | | | consumes from sndbuf and produces into receiver's RMBE [any context] | | by sending RDMA Write followed by SMC CDC message over RoCE RC-QP | | +----|----------------------------------------------------------------------- | +----|----------------------------------------------------------------------- | v RECEIVER | +------+ | | RMBE | [ring buffer, can have size different from sender's sndbuf] | | | [RMBE represents rcvbuf, no further de-coupling as on sender side] | +------+ | | | | consumes from RMBE [receiver's process context] | v | recvmsg() +---------------------------------------------------------------------------- Flow control ("cursor" updates) by means of SMC CDC messages: SENDER RECEIVER sends updates via CDC-------------+ sends updates via CDC on consuming from sndbuf | on consuming from RMBE and producing into RMBE | by means of recvmsg() | | | | +-----------------------------------|------------+ | | +--v-------------------------+ +--v-----------------------+ | receiver's consumer cursor | | sender's producer cursor----+ +----------------|-----------+ +--------------------------+ | | | | receiver's RMBE | | +--------------------------+ | | | | | +--------------------------------+ | | | | | | | v | | | +------------| | |-------------+////////////| | |//RDMA data written by////| | |////sender that is////////| | |/available to be consumed/| | |///////// +---------------| | |----------+^ | | | | | | | +-----------------+ | | +--------------------------+ Sending updates of the producer cursor is immediate for low latency; something like Nagle's algorithm (absence of TCP_NODELAY) is optional and currently not part of this initial Linux implementation. Sending updates of the consumer cursor is conditional to avoid the silly window syndrome. Normal connection termination: Normal connection termination starts transitioning from socket state ACTIVE via either "Active Close" or "Passive Close". shutdown rdwr +-----------------+ or close, +-------------->| INIT / CLOSED |<-------------+ send PeerCon|nClosed +-----------------+ | PeerConnClosed | | | received | connection | established | | V | +----------------+ +-----------------+ +----------------+ |AppFinCloseWait | | ACTIVE | |PeerFinCloseWait| +----------------+ +-----------------+ +----------------+ | | | | | Active Close: | |Passive Close: | | close or | |PeerConnClosed or | | shutdown wr or| |PeerDoneWriting | | shutdown rdwr | |received | | V V | PeerConnClo|sed +--------------+ +-------------+ | close or received +--<----|PeerCloseWait1| |AppCloseWait1|--->----+ shutdown rdwr, | +--------------+ +-------------+ | send | PeerDoneWri|ting | shutdown wr, | PeerConnClosed | received | send Pee|rDoneWriting | | V V | | +--------------+ +-------------+ | +--<----|PeerCloseWait2| |AppCloseWait2|--->----+ +--------------+ +-------------+ In state CLOSED, the socket can be destructed only, once the application has issued a close(). Abnormal connection termination: +-----------------+ +-------------->| INIT / CLOSED |<-------------+ | +-----------------+ | | | | +-----------------------+ | | | Any state | | PeerConnAbo|rt | (before setting | | send received | | PeerConnClosed | | PeerConnAbort | | indicator in | | | | peer's RMBE) | | | +-----------------------+ | | | | | | Active Abort: | | Passive Abort: | | problem, | | PeerConnAbort | | send | | received, | | PeerConnAbort,| | ECONNRESET | | ECONNABORTED | | | | V V | | +--------------+ +--------------+ | +-------|PeerAbortWait | | ProcessAbort |------+ +--------------+ +--------------+ Implementation notes beyond RFC 7609: A PNET table in sysfs provides the mapping between network device names and RoCE Infiniband device names for the transparent switch of data communication. A PNET table can contain an arbitrary number of PNETIDs. Each PNETID contains exactly one (Ethernet) network device name and one or more RoCE Infiniband device names. Each device name can only exist in at most one PNETID (no overlapping). This initial Linux implementation allows at most one RoCE Infiniband device name per PNETID. After a new TCP connection is established, the network device name used for egress traffic with the TCP connection's local source IP address is used as key to lookup the unique PNETID, and the RoCE Infiniband device of this PNETID is used to switch data communication from TCP to RDMA during SMC CLC handshake. Problem determination: A protocol dissector is available with upstream wireshark for formatting SMC-R related RoCE LAN traffic. [https://code.wireshark.org/review/gitweb?p=wireshark.git;a=blob;f=epan/dissectors/packet-smcr.c] We are working on enhancing the Linux implementation to cover: - Improve default socket closing asynchronicity - Address corner cases with many parallel connections - Tracing - Integrated load balancing and fail-over within a link group - Splice and sendpage support - IPv6 addressing support - Keepalive, Cork - Namespaces support - Urgent data - More socket options - Diagnostics - Statistics support - SNMP support References: [1] SMC-R Informational RFC: http://www.rfc-editor.org/info/rfc7609 ==================== Signed-off-by: -
Ursula Braun authored
Support for SMC socket monitoring via netlink sockets of protocol NETLINK_SOCK_DIAG. Signed-off-by:
Ursula Braun <ubraun@linux.vnet.ibm.com> Signed-off-by:
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Ursula Braun authored
smc_shutdown() and smc_release() handling delayed linkgroup cleanup for linkgroups without connections Signed-off-by:
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Ursula Braun authored
move RMBE data into user space buffer and update managing cursors Signed-off-by:
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Ursula Braun authored
copy data to kernel send buffer, and trigger RDMA write Signed-off-by:
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Ursula Braun authored
send and receive CDC messages (via IB message send and CQE) Signed-off-by:
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Ursula Braun authored
send and receive LLC messages CONFIRM_LINK (via IB message send and CQE) Signed-off-by:
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Ursula Braun authored
Prepare the link for RDMA transport: Create a queue pair (QP) and move it into the state Ready-To-Receive (RTR). Signed-off-by:
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Ursula Braun authored
The base containers for RDMA transport are work requests and completion queue entries processed through Infiniband verbs: * allocate and initialize these areas * map these areas to DMA * implement the basic communication consisting of work request posting and receival of completion queue events Signed-off-by:
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