From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- drivers/crypto/nx/nx-842.c | 521 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 521 insertions(+) create mode 100644 drivers/crypto/nx/nx-842.c (limited to 'drivers/crypto/nx/nx-842.c') diff --git a/drivers/crypto/nx/nx-842.c b/drivers/crypto/nx/nx-842.c new file mode 100644 index 000000000..2ab90ec10 --- /dev/null +++ b/drivers/crypto/nx/nx-842.c @@ -0,0 +1,521 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Cryptographic API for the NX-842 hardware compression. + * + * Copyright (C) IBM Corporation, 2011-2015 + * + * Designer of the Power data compression engine: + * Bulent Abali + * + * Original Authors: Robert Jennings + * Seth Jennings + * + * Rewrite: Dan Streetman + * + * This is an interface to the NX-842 compression hardware in PowerPC + * processors. Most of the complexity of this drvier is due to the fact that + * the NX-842 compression hardware requires the input and output data buffers + * to be specifically aligned, to be a specific multiple in length, and within + * specific minimum and maximum lengths. Those restrictions, provided by the + * nx-842 driver via nx842_constraints, mean this driver must use bounce + * buffers and headers to correct misaligned in or out buffers, and to split + * input buffers that are too large. + * + * This driver will fall back to software decompression if the hardware + * decompression fails, so this driver's decompression should never fail as + * long as the provided compressed buffer is valid. Any compressed buffer + * created by this driver will have a header (except ones where the input + * perfectly matches the constraints); so users of this driver cannot simply + * pass a compressed buffer created by this driver over to the 842 software + * decompression library. Instead, users must use this driver to decompress; + * if the hardware fails or is unavailable, the compressed buffer will be + * parsed and the header removed, and the raw 842 buffer(s) passed to the 842 + * software decompression library. + * + * This does not fall back to software compression, however, since the caller + * of this function is specifically requesting hardware compression; if the + * hardware compression fails, the caller can fall back to software + * compression, and the raw 842 compressed buffer that the software compressor + * creates can be passed to this driver for hardware decompression; any + * buffer without our specific header magic is assumed to be a raw 842 buffer + * and passed directly to the hardware. Note that the software compression + * library will produce a compressed buffer that is incompatible with the + * hardware decompressor if the original input buffer length is not a multiple + * of 8; if such a compressed buffer is passed to this driver for + * decompression, the hardware will reject it and this driver will then pass + * it over to the software library for decompression. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include + +#include "nx-842.h" + +/* The first 5 bits of this magic are 0x1f, which is an invalid 842 5-bit + * template (see lib/842/842.h), so this magic number will never appear at + * the start of a raw 842 compressed buffer. That is important, as any buffer + * passed to us without this magic is assumed to be a raw 842 compressed + * buffer, and passed directly to the hardware to decompress. + */ +#define NX842_CRYPTO_MAGIC (0xf842) +#define NX842_CRYPTO_HEADER_SIZE(g) \ + (sizeof(struct nx842_crypto_header) + \ + sizeof(struct nx842_crypto_header_group) * (g)) +#define NX842_CRYPTO_HEADER_MAX_SIZE \ + NX842_CRYPTO_HEADER_SIZE(NX842_CRYPTO_GROUP_MAX) + +/* bounce buffer size */ +#define BOUNCE_BUFFER_ORDER (2) +#define BOUNCE_BUFFER_SIZE \ + ((unsigned int)(PAGE_SIZE << BOUNCE_BUFFER_ORDER)) + +/* try longer on comp because we can fallback to sw decomp if hw is busy */ +#define COMP_BUSY_TIMEOUT (250) /* ms */ +#define DECOMP_BUSY_TIMEOUT (50) /* ms */ + +struct nx842_crypto_param { + u8 *in; + unsigned int iremain; + u8 *out; + unsigned int oremain; + unsigned int ototal; +}; + +static int update_param(struct nx842_crypto_param *p, + unsigned int slen, unsigned int dlen) +{ + if (p->iremain < slen) + return -EOVERFLOW; + if (p->oremain < dlen) + return -ENOSPC; + + p->in += slen; + p->iremain -= slen; + p->out += dlen; + p->oremain -= dlen; + p->ototal += dlen; + + return 0; +} + +int nx842_crypto_init(struct crypto_tfm *tfm, struct nx842_driver *driver) +{ + struct nx842_crypto_ctx *ctx = crypto_tfm_ctx(tfm); + + spin_lock_init(&ctx->lock); + ctx->driver = driver; + ctx->wmem = kmalloc(driver->workmem_size, GFP_KERNEL); + ctx->sbounce = (u8 *)__get_free_pages(GFP_KERNEL, BOUNCE_BUFFER_ORDER); + ctx->dbounce = (u8 *)__get_free_pages(GFP_KERNEL, BOUNCE_BUFFER_ORDER); + if (!ctx->wmem || !ctx->sbounce || !ctx->dbounce) { + kfree(ctx->wmem); + free_page((unsigned long)ctx->sbounce); + free_page((unsigned long)ctx->dbounce); + return -ENOMEM; + } + + return 0; +} +EXPORT_SYMBOL_GPL(nx842_crypto_init); + +void nx842_crypto_exit(struct crypto_tfm *tfm) +{ + struct nx842_crypto_ctx *ctx = crypto_tfm_ctx(tfm); + + kfree(ctx->wmem); + free_page((unsigned long)ctx->sbounce); + free_page((unsigned long)ctx->dbounce); +} +EXPORT_SYMBOL_GPL(nx842_crypto_exit); + +static void check_constraints(struct nx842_constraints *c) +{ + /* limit maximum, to always have enough bounce buffer to decompress */ + if (c->maximum > BOUNCE_BUFFER_SIZE) + c->maximum = BOUNCE_BUFFER_SIZE; +} + +static int nx842_crypto_add_header(struct nx842_crypto_header *hdr, u8 *buf) +{ + int s = NX842_CRYPTO_HEADER_SIZE(hdr->groups); + + /* compress should have added space for header */ + if (s > be16_to_cpu(hdr->group[0].padding)) { + pr_err("Internal error: no space for header\n"); + return -EINVAL; + } + + memcpy(buf, hdr, s); + + print_hex_dump_debug("header ", DUMP_PREFIX_OFFSET, 16, 1, buf, s, 0); + + return 0; +} + +static int compress(struct nx842_crypto_ctx *ctx, + struct nx842_crypto_param *p, + struct nx842_crypto_header_group *g, + struct nx842_constraints *c, + u16 *ignore, + unsigned int hdrsize) +{ + unsigned int slen = p->iremain, dlen = p->oremain, tmplen; + unsigned int adj_slen = slen; + u8 *src = p->in, *dst = p->out; + int ret, dskip = 0; + ktime_t timeout; + + if (p->iremain == 0) + return -EOVERFLOW; + + if (p->oremain == 0 || hdrsize + c->minimum > dlen) + return -ENOSPC; + + if (slen % c->multiple) + adj_slen = round_up(slen, c->multiple); + if (slen < c->minimum) + adj_slen = c->minimum; + if (slen > c->maximum) + adj_slen = slen = c->maximum; + if (adj_slen > slen || (u64)src % c->alignment) { + adj_slen = min(adj_slen, BOUNCE_BUFFER_SIZE); + slen = min(slen, BOUNCE_BUFFER_SIZE); + if (adj_slen > slen) + memset(ctx->sbounce + slen, 0, adj_slen - slen); + memcpy(ctx->sbounce, src, slen); + src = ctx->sbounce; + slen = adj_slen; + pr_debug("using comp sbounce buffer, len %x\n", slen); + } + + dst += hdrsize; + dlen -= hdrsize; + + if ((u64)dst % c->alignment) { + dskip = (int)(PTR_ALIGN(dst, c->alignment) - dst); + dst += dskip; + dlen -= dskip; + } + if (dlen % c->multiple) + dlen = round_down(dlen, c->multiple); + if (dlen < c->minimum) { +nospc: + dst = ctx->dbounce; + dlen = min(p->oremain, BOUNCE_BUFFER_SIZE); + dlen = round_down(dlen, c->multiple); + dskip = 0; + pr_debug("using comp dbounce buffer, len %x\n", dlen); + } + if (dlen > c->maximum) + dlen = c->maximum; + + tmplen = dlen; + timeout = ktime_add_ms(ktime_get(), COMP_BUSY_TIMEOUT); + do { + dlen = tmplen; /* reset dlen, if we're retrying */ + ret = ctx->driver->compress(src, slen, dst, &dlen, ctx->wmem); + /* possibly we should reduce the slen here, instead of + * retrying with the dbounce buffer? + */ + if (ret == -ENOSPC && dst != ctx->dbounce) + goto nospc; + } while (ret == -EBUSY && ktime_before(ktime_get(), timeout)); + if (ret) + return ret; + + dskip += hdrsize; + + if (dst == ctx->dbounce) + memcpy(p->out + dskip, dst, dlen); + + g->padding = cpu_to_be16(dskip); + g->compressed_length = cpu_to_be32(dlen); + g->uncompressed_length = cpu_to_be32(slen); + + if (p->iremain < slen) { + *ignore = slen - p->iremain; + slen = p->iremain; + } + + pr_debug("compress slen %x ignore %x dlen %x padding %x\n", + slen, *ignore, dlen, dskip); + + return update_param(p, slen, dskip + dlen); +} + +int nx842_crypto_compress(struct crypto_tfm *tfm, + const u8 *src, unsigned int slen, + u8 *dst, unsigned int *dlen) +{ + struct nx842_crypto_ctx *ctx = crypto_tfm_ctx(tfm); + struct nx842_crypto_header *hdr = &ctx->header; + struct nx842_crypto_param p; + struct nx842_constraints c = *ctx->driver->constraints; + unsigned int groups, hdrsize, h; + int ret, n; + bool add_header; + u16 ignore = 0; + + check_constraints(&c); + + p.in = (u8 *)src; + p.iremain = slen; + p.out = dst; + p.oremain = *dlen; + p.ototal = 0; + + *dlen = 0; + + groups = min_t(unsigned int, NX842_CRYPTO_GROUP_MAX, + DIV_ROUND_UP(p.iremain, c.maximum)); + hdrsize = NX842_CRYPTO_HEADER_SIZE(groups); + + spin_lock_bh(&ctx->lock); + + /* skip adding header if the buffers meet all constraints */ + add_header = (p.iremain % c.multiple || + p.iremain < c.minimum || + p.iremain > c.maximum || + (u64)p.in % c.alignment || + p.oremain % c.multiple || + p.oremain < c.minimum || + p.oremain > c.maximum || + (u64)p.out % c.alignment); + + hdr->magic = cpu_to_be16(NX842_CRYPTO_MAGIC); + hdr->groups = 0; + hdr->ignore = 0; + + while (p.iremain > 0) { + n = hdr->groups++; + ret = -ENOSPC; + if (hdr->groups > NX842_CRYPTO_GROUP_MAX) + goto unlock; + + /* header goes before first group */ + h = !n && add_header ? hdrsize : 0; + + if (ignore) + pr_warn("internal error, ignore is set %x\n", ignore); + + ret = compress(ctx, &p, &hdr->group[n], &c, &ignore, h); + if (ret) + goto unlock; + } + + if (!add_header && hdr->groups > 1) { + pr_err("Internal error: No header but multiple groups\n"); + ret = -EINVAL; + goto unlock; + } + + /* ignore indicates the input stream needed to be padded */ + hdr->ignore = cpu_to_be16(ignore); + if (ignore) + pr_debug("marked %d bytes as ignore\n", ignore); + + if (add_header) + ret = nx842_crypto_add_header(hdr, dst); + if (ret) + goto unlock; + + *dlen = p.ototal; + + pr_debug("compress total slen %x dlen %x\n", slen, *dlen); + +unlock: + spin_unlock_bh(&ctx->lock); + return ret; +} +EXPORT_SYMBOL_GPL(nx842_crypto_compress); + +static int decompress(struct nx842_crypto_ctx *ctx, + struct nx842_crypto_param *p, + struct nx842_crypto_header_group *g, + struct nx842_constraints *c, + u16 ignore) +{ + unsigned int slen = be32_to_cpu(g->compressed_length); + unsigned int required_len = be32_to_cpu(g->uncompressed_length); + unsigned int dlen = p->oremain, tmplen; + unsigned int adj_slen = slen; + u8 *src = p->in, *dst = p->out; + u16 padding = be16_to_cpu(g->padding); + int ret, spadding = 0; + ktime_t timeout; + + if (!slen || !required_len) + return -EINVAL; + + if (p->iremain <= 0 || padding + slen > p->iremain) + return -EOVERFLOW; + + if (p->oremain <= 0 || required_len - ignore > p->oremain) + return -ENOSPC; + + src += padding; + + if (slen % c->multiple) + adj_slen = round_up(slen, c->multiple); + if (slen < c->minimum) + adj_slen = c->minimum; + if (slen > c->maximum) + goto usesw; + if (slen < adj_slen || (u64)src % c->alignment) { + /* we can append padding bytes because the 842 format defines + * an "end" template (see lib/842/842_decompress.c) and will + * ignore any bytes following it. + */ + if (slen < adj_slen) + memset(ctx->sbounce + slen, 0, adj_slen - slen); + memcpy(ctx->sbounce, src, slen); + src = ctx->sbounce; + spadding = adj_slen - slen; + slen = adj_slen; + pr_debug("using decomp sbounce buffer, len %x\n", slen); + } + + if (dlen % c->multiple) + dlen = round_down(dlen, c->multiple); + if (dlen < required_len || (u64)dst % c->alignment) { + dst = ctx->dbounce; + dlen = min(required_len, BOUNCE_BUFFER_SIZE); + pr_debug("using decomp dbounce buffer, len %x\n", dlen); + } + if (dlen < c->minimum) + goto usesw; + if (dlen > c->maximum) + dlen = c->maximum; + + tmplen = dlen; + timeout = ktime_add_ms(ktime_get(), DECOMP_BUSY_TIMEOUT); + do { + dlen = tmplen; /* reset dlen, if we're retrying */ + ret = ctx->driver->decompress(src, slen, dst, &dlen, ctx->wmem); + } while (ret == -EBUSY && ktime_before(ktime_get(), timeout)); + if (ret) { +usesw: + /* reset everything, sw doesn't have constraints */ + src = p->in + padding; + slen = be32_to_cpu(g->compressed_length); + spadding = 0; + dst = p->out; + dlen = p->oremain; + if (dlen < required_len) { /* have ignore bytes */ + dst = ctx->dbounce; + dlen = BOUNCE_BUFFER_SIZE; + } + pr_info_ratelimited("using software 842 decompression\n"); + ret = sw842_decompress(src, slen, dst, &dlen); + } + if (ret) + return ret; + + slen -= spadding; + + dlen -= ignore; + if (ignore) + pr_debug("ignoring last %x bytes\n", ignore); + + if (dst == ctx->dbounce) + memcpy(p->out, dst, dlen); + + pr_debug("decompress slen %x padding %x dlen %x ignore %x\n", + slen, padding, dlen, ignore); + + return update_param(p, slen + padding, dlen); +} + +int nx842_crypto_decompress(struct crypto_tfm *tfm, + const u8 *src, unsigned int slen, + u8 *dst, unsigned int *dlen) +{ + struct nx842_crypto_ctx *ctx = crypto_tfm_ctx(tfm); + struct nx842_crypto_header *hdr; + struct nx842_crypto_param p; + struct nx842_constraints c = *ctx->driver->constraints; + int n, ret, hdr_len; + u16 ignore = 0; + + check_constraints(&c); + + p.in = (u8 *)src; + p.iremain = slen; + p.out = dst; + p.oremain = *dlen; + p.ototal = 0; + + *dlen = 0; + + hdr = (struct nx842_crypto_header *)src; + + spin_lock_bh(&ctx->lock); + + /* If it doesn't start with our header magic number, assume it's a raw + * 842 compressed buffer and pass it directly to the hardware driver + */ + if (be16_to_cpu(hdr->magic) != NX842_CRYPTO_MAGIC) { + struct nx842_crypto_header_group g = { + .padding = 0, + .compressed_length = cpu_to_be32(p.iremain), + .uncompressed_length = cpu_to_be32(p.oremain), + }; + + ret = decompress(ctx, &p, &g, &c, 0); + if (ret) + goto unlock; + + goto success; + } + + if (!hdr->groups) { + pr_err("header has no groups\n"); + ret = -EINVAL; + goto unlock; + } + if (hdr->groups > NX842_CRYPTO_GROUP_MAX) { + pr_err("header has too many groups %x, max %x\n", + hdr->groups, NX842_CRYPTO_GROUP_MAX); + ret = -EINVAL; + goto unlock; + } + + hdr_len = NX842_CRYPTO_HEADER_SIZE(hdr->groups); + if (hdr_len > slen) { + ret = -EOVERFLOW; + goto unlock; + } + + memcpy(&ctx->header, src, hdr_len); + hdr = &ctx->header; + + for (n = 0; n < hdr->groups; n++) { + /* ignore applies to last group */ + if (n + 1 == hdr->groups) + ignore = be16_to_cpu(hdr->ignore); + + ret = decompress(ctx, &p, &hdr->group[n], &c, ignore); + if (ret) + goto unlock; + } + +success: + *dlen = p.ototal; + + pr_debug("decompress total slen %x dlen %x\n", slen, *dlen); + + ret = 0; + +unlock: + spin_unlock_bh(&ctx->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(nx842_crypto_decompress); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("IBM PowerPC Nest (NX) 842 Hardware Compression Driver"); +MODULE_AUTHOR("Dan Streetman "); -- cgit v1.2.3