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authorLibravatar Linus Torvalds <torvalds@linux-foundation.org>2023-02-21 18:24:12 -0800
committerLibravatar Linus Torvalds <torvalds@linux-foundation.org>2023-02-21 18:24:12 -0800
commit5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 (patch)
treecc5c2d0a898769fd59549594fedb3ee6f84e59a0 /drivers/net/wireless/silabs/wfx/bh.c
downloadlinux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.tar.gz
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Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted
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(). ...
Diffstat (limited to 'drivers/net/wireless/silabs/wfx/bh.c')
-rw-r--r--drivers/net/wireless/silabs/wfx/bh.c324
1 files changed, 324 insertions, 0 deletions
diff --git a/drivers/net/wireless/silabs/wfx/bh.c b/drivers/net/wireless/silabs/wfx/bh.c
new file mode 100644
index 000000000..21dfdcf9c
--- /dev/null
+++ b/drivers/net/wireless/silabs/wfx/bh.c
@@ -0,0 +1,324 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Interrupt bottom half (BH).
+ *
+ * Copyright (c) 2017-2020, Silicon Laboratories, Inc.
+ * Copyright (c) 2010, ST-Ericsson
+ */
+#include <linux/gpio/consumer.h>
+#include <net/mac80211.h>
+
+#include "bh.h"
+#include "wfx.h"
+#include "hwio.h"
+#include "traces.h"
+#include "hif_rx.h"
+#include "hif_api_cmd.h"
+
+static void device_wakeup(struct wfx_dev *wdev)
+{
+ int max_retry = 3;
+
+ if (!wdev->pdata.gpio_wakeup)
+ return;
+ if (gpiod_get_value_cansleep(wdev->pdata.gpio_wakeup) > 0)
+ return;
+
+ if (wfx_api_older_than(wdev, 1, 4)) {
+ gpiod_set_value_cansleep(wdev->pdata.gpio_wakeup, 1);
+ if (!completion_done(&wdev->hif.ctrl_ready))
+ usleep_range(2000, 2500);
+ return;
+ }
+ for (;;) {
+ gpiod_set_value_cansleep(wdev->pdata.gpio_wakeup, 1);
+ /* completion.h does not provide any function to wait completion without consume it
+ * (a kind of wait_for_completion_done_timeout()). So we have to emulate it.
+ */
+ if (wait_for_completion_timeout(&wdev->hif.ctrl_ready, msecs_to_jiffies(2))) {
+ complete(&wdev->hif.ctrl_ready);
+ return;
+ } else if (max_retry-- > 0) {
+ /* Older firmwares have a race in sleep/wake-up process. Redo the process
+ * is sufficient to unfreeze the chip.
+ */
+ dev_err(wdev->dev, "timeout while wake up chip\n");
+ gpiod_set_value_cansleep(wdev->pdata.gpio_wakeup, 0);
+ usleep_range(2000, 2500);
+ } else {
+ dev_err(wdev->dev, "max wake-up retries reached\n");
+ return;
+ }
+ }
+}
+
+static void device_release(struct wfx_dev *wdev)
+{
+ if (!wdev->pdata.gpio_wakeup)
+ return;
+
+ gpiod_set_value_cansleep(wdev->pdata.gpio_wakeup, 0);
+}
+
+static int rx_helper(struct wfx_dev *wdev, size_t read_len, int *is_cnf)
+{
+ struct sk_buff *skb;
+ struct wfx_hif_msg *hif;
+ size_t alloc_len;
+ size_t computed_len;
+ int release_count;
+ int piggyback = 0;
+
+ WARN(read_len > round_down(0xFFF, 2) * sizeof(u16), "request exceed the chip capability");
+
+ /* Add 2 to take into account piggyback size */
+ alloc_len = wdev->hwbus_ops->align_size(wdev->hwbus_priv, read_len + 2);
+ skb = dev_alloc_skb(alloc_len);
+ if (!skb)
+ return -ENOMEM;
+
+ if (wfx_data_read(wdev, skb->data, alloc_len))
+ goto err;
+
+ piggyback = le16_to_cpup((__le16 *)(skb->data + alloc_len - 2));
+ _trace_piggyback(piggyback, false);
+
+ hif = (struct wfx_hif_msg *)skb->data;
+ WARN(hif->encrypted & 0x3, "encryption is unsupported");
+ if (WARN(read_len < sizeof(struct wfx_hif_msg), "corrupted read"))
+ goto err;
+ computed_len = le16_to_cpu(hif->len);
+ computed_len = round_up(computed_len, 2);
+ if (computed_len != read_len) {
+ dev_err(wdev->dev, "inconsistent message length: %zu != %zu\n",
+ computed_len, read_len);
+ print_hex_dump(KERN_INFO, "hif: ", DUMP_PREFIX_OFFSET, 16, 1,
+ hif, read_len, true);
+ goto err;
+ }
+
+ if (!(hif->id & HIF_ID_IS_INDICATION)) {
+ (*is_cnf)++;
+ if (hif->id == HIF_CNF_ID_MULTI_TRANSMIT)
+ release_count =
+ ((struct wfx_hif_cnf_multi_transmit *)hif->body)->num_tx_confs;
+ else
+ release_count = 1;
+ WARN(wdev->hif.tx_buffers_used < release_count, "corrupted buffer counter");
+ wdev->hif.tx_buffers_used -= release_count;
+ }
+ _trace_hif_recv(hif, wdev->hif.tx_buffers_used);
+
+ if (hif->id != HIF_IND_ID_EXCEPTION && hif->id != HIF_IND_ID_ERROR) {
+ if (hif->seqnum != wdev->hif.rx_seqnum)
+ dev_warn(wdev->dev, "wrong message sequence: %d != %d\n",
+ hif->seqnum, wdev->hif.rx_seqnum);
+ wdev->hif.rx_seqnum = (hif->seqnum + 1) % (HIF_COUNTER_MAX + 1);
+ }
+
+ skb_put(skb, le16_to_cpu(hif->len));
+ /* wfx_handle_rx takes care on SKB livetime */
+ wfx_handle_rx(wdev, skb);
+ if (!wdev->hif.tx_buffers_used)
+ wake_up(&wdev->hif.tx_buffers_empty);
+
+ return piggyback;
+
+err:
+ if (skb)
+ dev_kfree_skb(skb);
+ return -EIO;
+}
+
+static int bh_work_rx(struct wfx_dev *wdev, int max_msg, int *num_cnf)
+{
+ size_t len;
+ int i;
+ int ctrl_reg, piggyback;
+
+ piggyback = 0;
+ for (i = 0; i < max_msg; i++) {
+ if (piggyback & CTRL_NEXT_LEN_MASK)
+ ctrl_reg = piggyback;
+ else if (try_wait_for_completion(&wdev->hif.ctrl_ready))
+ ctrl_reg = atomic_xchg(&wdev->hif.ctrl_reg, 0);
+ else
+ ctrl_reg = 0;
+ if (!(ctrl_reg & CTRL_NEXT_LEN_MASK))
+ return i;
+ /* ctrl_reg units are 16bits words */
+ len = (ctrl_reg & CTRL_NEXT_LEN_MASK) * 2;
+ piggyback = rx_helper(wdev, len, num_cnf);
+ if (piggyback < 0)
+ return i;
+ if (!(piggyback & CTRL_WLAN_READY))
+ dev_err(wdev->dev, "unexpected piggyback value: ready bit not set: %04x\n",
+ piggyback);
+ }
+ if (piggyback & CTRL_NEXT_LEN_MASK) {
+ ctrl_reg = atomic_xchg(&wdev->hif.ctrl_reg, piggyback);
+ complete(&wdev->hif.ctrl_ready);
+ if (ctrl_reg)
+ dev_err(wdev->dev, "unexpected IRQ happened: %04x/%04x\n",
+ ctrl_reg, piggyback);
+ }
+ return i;
+}
+
+static void tx_helper(struct wfx_dev *wdev, struct wfx_hif_msg *hif)
+{
+ int ret;
+ void *data;
+ bool is_encrypted = false;
+ size_t len = le16_to_cpu(hif->len);
+
+ WARN(len < sizeof(*hif), "try to send corrupted data");
+
+ hif->seqnum = wdev->hif.tx_seqnum;
+ wdev->hif.tx_seqnum = (wdev->hif.tx_seqnum + 1) % (HIF_COUNTER_MAX + 1);
+
+ data = hif;
+ WARN(len > le16_to_cpu(wdev->hw_caps.size_inp_ch_buf),
+ "request exceed the chip capability: %zu > %d\n",
+ len, le16_to_cpu(wdev->hw_caps.size_inp_ch_buf));
+ len = wdev->hwbus_ops->align_size(wdev->hwbus_priv, len);
+ ret = wfx_data_write(wdev, data, len);
+ if (ret)
+ goto end;
+
+ wdev->hif.tx_buffers_used++;
+ _trace_hif_send(hif, wdev->hif.tx_buffers_used);
+end:
+ if (is_encrypted)
+ kfree(data);
+}
+
+static int bh_work_tx(struct wfx_dev *wdev, int max_msg)
+{
+ struct wfx_hif_msg *hif;
+ int i;
+
+ for (i = 0; i < max_msg; i++) {
+ hif = NULL;
+ if (wdev->hif.tx_buffers_used < le16_to_cpu(wdev->hw_caps.num_inp_ch_bufs)) {
+ if (try_wait_for_completion(&wdev->hif_cmd.ready)) {
+ WARN(!mutex_is_locked(&wdev->hif_cmd.lock), "data locking error");
+ hif = wdev->hif_cmd.buf_send;
+ } else {
+ hif = wfx_tx_queues_get(wdev);
+ }
+ }
+ if (!hif)
+ return i;
+ tx_helper(wdev, hif);
+ }
+ return i;
+}
+
+/* In SDIO mode, it is necessary to make an access to a register to acknowledge last received
+ * message. It could be possible to restrict this acknowledge to SDIO mode and only if last
+ * operation was rx.
+ */
+static void ack_sdio_data(struct wfx_dev *wdev)
+{
+ u32 cfg_reg;
+
+ wfx_config_reg_read(wdev, &cfg_reg);
+ if (cfg_reg & 0xFF) {
+ dev_warn(wdev->dev, "chip reports errors: %02x\n", cfg_reg & 0xFF);
+ wfx_config_reg_write_bits(wdev, 0xFF, 0x00);
+ }
+}
+
+static void bh_work(struct work_struct *work)
+{
+ struct wfx_dev *wdev = container_of(work, struct wfx_dev, hif.bh);
+ int stats_req = 0, stats_cnf = 0, stats_ind = 0;
+ bool release_chip = false, last_op_is_rx = false;
+ int num_tx, num_rx;
+
+ device_wakeup(wdev);
+ do {
+ num_tx = bh_work_tx(wdev, 32);
+ stats_req += num_tx;
+ if (num_tx)
+ last_op_is_rx = false;
+ num_rx = bh_work_rx(wdev, 32, &stats_cnf);
+ stats_ind += num_rx;
+ if (num_rx)
+ last_op_is_rx = true;
+ } while (num_rx || num_tx);
+ stats_ind -= stats_cnf;
+
+ if (last_op_is_rx)
+ ack_sdio_data(wdev);
+ if (!wdev->hif.tx_buffers_used && !work_pending(work)) {
+ device_release(wdev);
+ release_chip = true;
+ }
+ _trace_bh_stats(stats_ind, stats_req, stats_cnf, wdev->hif.tx_buffers_used, release_chip);
+}
+
+/* An IRQ from chip did occur */
+void wfx_bh_request_rx(struct wfx_dev *wdev)
+{
+ u32 cur, prev;
+
+ wfx_control_reg_read(wdev, &cur);
+ prev = atomic_xchg(&wdev->hif.ctrl_reg, cur);
+ complete(&wdev->hif.ctrl_ready);
+ queue_work(wdev->bh_wq, &wdev->hif.bh);
+
+ if (!(cur & CTRL_NEXT_LEN_MASK))
+ dev_err(wdev->dev, "unexpected control register value: length field is 0: %04x\n",
+ cur);
+ if (prev != 0)
+ dev_err(wdev->dev, "received IRQ but previous data was not (yet) read: %04x/%04x\n",
+ prev, cur);
+}
+
+/* Driver want to send data */
+void wfx_bh_request_tx(struct wfx_dev *wdev)
+{
+ queue_work(wdev->bh_wq, &wdev->hif.bh);
+}
+
+/* If IRQ is not available, this function allow to manually poll the control register and simulate
+ * an IRQ ahen an event happened.
+ *
+ * Note that the device has a bug: If an IRQ raise while host read control register, the IRQ is
+ * lost. So, use this function carefully (only duing device initialisation).
+ */
+void wfx_bh_poll_irq(struct wfx_dev *wdev)
+{
+ ktime_t now, start;
+ u32 reg;
+
+ WARN(!wdev->poll_irq, "unexpected IRQ polling can mask IRQ");
+ flush_workqueue(wdev->bh_wq);
+ start = ktime_get();
+ for (;;) {
+ wfx_control_reg_read(wdev, &reg);
+ now = ktime_get();
+ if (reg & 0xFFF)
+ break;
+ if (ktime_after(now, ktime_add_ms(start, 1000))) {
+ dev_err(wdev->dev, "time out while polling control register\n");
+ return;
+ }
+ udelay(200);
+ }
+ wfx_bh_request_rx(wdev);
+}
+
+void wfx_bh_register(struct wfx_dev *wdev)
+{
+ INIT_WORK(&wdev->hif.bh, bh_work);
+ init_completion(&wdev->hif.ctrl_ready);
+ init_waitqueue_head(&wdev->hif.tx_buffers_empty);
+}
+
+void wfx_bh_unregister(struct wfx_dev *wdev)
+{
+ flush_work(&wdev->hif.bh);
+}