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/scsi/scsicam.c | 257 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 257 insertions(+) create mode 100644 drivers/scsi/scsicam.c (limited to 'drivers/scsi/scsicam.c') diff --git a/drivers/scsi/scsicam.c b/drivers/scsi/scsicam.c new file mode 100644 index 000000000..e2c7d8ef2 --- /dev/null +++ b/drivers/scsi/scsicam.c @@ -0,0 +1,257 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * scsicam.c - SCSI CAM support functions, use for HDIO_GETGEO, etc. + * + * Copyright 1993, 1994 Drew Eckhardt + * Visionary Computing + * (Unix and Linux consulting and custom programming) + * drew@Colorado.EDU + * +1 (303) 786-7975 + * + * For more information, please consult the SCSI-CAM draft. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +/** + * scsi_bios_ptable - Read PC partition table out of first sector of device. + * @dev: from this device + * + * Description: Reads the first sector from the device and returns %0x42 bytes + * starting at offset %0x1be. + * Returns: partition table in kmalloc(GFP_KERNEL) memory, or NULL on error. + */ +unsigned char *scsi_bios_ptable(struct block_device *dev) +{ + struct address_space *mapping = bdev_whole(dev)->bd_inode->i_mapping; + unsigned char *res = NULL; + struct folio *folio; + + folio = read_mapping_folio(mapping, 0, NULL); + if (IS_ERR(folio)) + return NULL; + + res = kmemdup(folio_address(folio) + 0x1be, 66, GFP_KERNEL); + folio_put(folio); + return res; +} +EXPORT_SYMBOL(scsi_bios_ptable); + +/** + * scsi_partsize - Parse cylinders/heads/sectors from PC partition table + * @bdev: block device to parse + * @capacity: size of the disk in sectors + * @geom: output in form of [hds, cylinders, sectors] + * + * Determine the BIOS mapping/geometry used to create the partition + * table, storing the results in @geom. + * + * Returns: %false on failure, %true on success. + */ +bool scsi_partsize(struct block_device *bdev, sector_t capacity, int geom[3]) +{ + int cyl, ext_cyl, end_head, end_cyl, end_sector; + unsigned int logical_end, physical_end, ext_physical_end; + struct msdos_partition *p, *largest = NULL; + void *buf; + int ret = false; + + buf = scsi_bios_ptable(bdev); + if (!buf) + return false; + + if (*(unsigned short *) (buf + 64) == 0xAA55) { + int largest_cyl = -1, i; + + for (i = 0, p = buf; i < 4; i++, p++) { + if (!p->sys_ind) + continue; +#ifdef DEBUG + printk("scsicam_bios_param : partition %d has system \n", + i); +#endif + cyl = p->cyl + ((p->sector & 0xc0) << 2); + if (cyl > largest_cyl) { + largest_cyl = cyl; + largest = p; + } + } + } + if (largest) { + end_cyl = largest->end_cyl + ((largest->end_sector & 0xc0) << 2); + end_head = largest->end_head; + end_sector = largest->end_sector & 0x3f; + + if (end_head + 1 == 0 || end_sector == 0) + goto out_free_buf; + +#ifdef DEBUG + printk("scsicam_bios_param : end at h = %d, c = %d, s = %d\n", + end_head, end_cyl, end_sector); +#endif + + physical_end = end_cyl * (end_head + 1) * end_sector + + end_head * end_sector + end_sector; + + /* This is the actual _sector_ number at the end */ + logical_end = get_unaligned_le32(&largest->start_sect) + + get_unaligned_le32(&largest->nr_sects); + + /* This is for >1023 cylinders */ + ext_cyl = (logical_end - (end_head * end_sector + end_sector)) + / (end_head + 1) / end_sector; + ext_physical_end = ext_cyl * (end_head + 1) * end_sector + + end_head * end_sector + end_sector; + +#ifdef DEBUG + printk("scsicam_bios_param : logical_end=%d physical_end=%d ext_physical_end=%d ext_cyl=%d\n" + ,logical_end, physical_end, ext_physical_end, ext_cyl); +#endif + + if (logical_end == physical_end || + (end_cyl == 1023 && ext_physical_end == logical_end)) { + geom[0] = end_head + 1; + geom[1] = end_sector; + geom[2] = (unsigned long)capacity / + ((end_head + 1) * end_sector); + ret = true; + goto out_free_buf; + } +#ifdef DEBUG + printk("scsicam_bios_param : logical (%u) != physical (%u)\n", + logical_end, physical_end); +#endif + } + +out_free_buf: + kfree(buf); + return ret; +} +EXPORT_SYMBOL(scsi_partsize); + +/* + * Function : static int setsize(unsigned long capacity,unsigned int *cyls, + * unsigned int *hds, unsigned int *secs); + * + * Purpose : to determine a near-optimal int 0x13 mapping for a + * SCSI disk in terms of lost space of size capacity, storing + * the results in *cyls, *hds, and *secs. + * + * Returns : -1 on failure, 0 on success. + * + * Extracted from + * + * WORKING X3T9.2 + * DRAFT 792D + * see http://www.t10.org/ftp/t10/drafts/cam/cam-r12b.pdf + * + * Revision 6 + * 10-MAR-94 + * Information technology - + * SCSI-2 Common access method + * transport and SCSI interface module + * + * ANNEX A : + * + * setsize() converts a read capacity value to int 13h + * head-cylinder-sector requirements. It minimizes the value for + * number of heads and maximizes the number of cylinders. This + * will support rather large disks before the number of heads + * will not fit in 4 bits (or 6 bits). This algorithm also + * minimizes the number of sectors that will be unused at the end + * of the disk while allowing for very large disks to be + * accommodated. This algorithm does not use physical geometry. + */ + +static int setsize(unsigned long capacity, unsigned int *cyls, unsigned int *hds, + unsigned int *secs) +{ + unsigned int rv = 0; + unsigned long heads, sectors, cylinders, temp; + + cylinders = 1024L; /* Set number of cylinders to max */ + sectors = 62L; /* Maximize sectors per track */ + + temp = cylinders * sectors; /* Compute divisor for heads */ + heads = capacity / temp; /* Compute value for number of heads */ + if (capacity % temp) { /* If no remainder, done! */ + heads++; /* Else, increment number of heads */ + temp = cylinders * heads; /* Compute divisor for sectors */ + sectors = capacity / temp; /* Compute value for sectors per + track */ + if (capacity % temp) { /* If no remainder, done! */ + sectors++; /* Else, increment number of sectors */ + temp = heads * sectors; /* Compute divisor for cylinders */ + cylinders = capacity / temp; /* Compute number of cylinders */ + } + } + if (cylinders == 0) + rv = (unsigned) -1; /* Give error if 0 cylinders */ + + *cyls = (unsigned int) cylinders; /* Stuff return values */ + *secs = (unsigned int) sectors; + *hds = (unsigned int) heads; + return (rv); +} + +/** + * scsicam_bios_param - Determine geometry of a disk in cylinders/heads/sectors. + * @bdev: which device + * @capacity: size of the disk in sectors + * @ip: return value: ip[0]=heads, ip[1]=sectors, ip[2]=cylinders + * + * Description : determine the BIOS mapping/geometry used for a drive in a + * SCSI-CAM system, storing the results in ip as required + * by the HDIO_GETGEO ioctl(). + * + * Returns : -1 on failure, 0 on success. + */ +int scsicam_bios_param(struct block_device *bdev, sector_t capacity, int *ip) +{ + u64 capacity64 = capacity; /* Suppress gcc warning */ + int ret = 0; + + /* try to infer mapping from partition table */ + if (scsi_partsize(bdev, capacity, ip)) + return 0; + + if (capacity64 < (1ULL << 32)) { + /* + * Pick some standard mapping with at most 1024 cylinders, and + * at most 62 sectors per track - this works up to 7905 MB. + */ + ret = setsize((unsigned long)capacity, (unsigned int *)ip + 2, + (unsigned int *)ip + 0, (unsigned int *)ip + 1); + } + + /* + * If something went wrong, then apparently we have to return a geometry + * with more than 1024 cylinders. + */ + if (ret || ip[0] > 255 || ip[1] > 63) { + if ((capacity >> 11) > 65534) { + ip[0] = 255; + ip[1] = 63; + } else { + ip[0] = 64; + ip[1] = 32; + } + + if (capacity > 65535*63*255) + ip[2] = 65535; + else + ip[2] = (unsigned long)capacity / (ip[0] * ip[1]); + } + + return 0; +} +EXPORT_SYMBOL(scsicam_bios_param); -- cgit v1.2.3