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/net/ethernet/google/gve/gve_rx_dqo.c | 756 +++++++++++++++++++++++++++ 1 file changed, 756 insertions(+) create mode 100644 drivers/net/ethernet/google/gve/gve_rx_dqo.c (limited to 'drivers/net/ethernet/google/gve/gve_rx_dqo.c') diff --git a/drivers/net/ethernet/google/gve/gve_rx_dqo.c b/drivers/net/ethernet/google/gve/gve_rx_dqo.c new file mode 100644 index 000000000..630f42a30 --- /dev/null +++ b/drivers/net/ethernet/google/gve/gve_rx_dqo.c @@ -0,0 +1,756 @@ +// SPDX-License-Identifier: (GPL-2.0 OR MIT) +/* Google virtual Ethernet (gve) driver + * + * Copyright (C) 2015-2021 Google, Inc. + */ + +#include "gve.h" +#include "gve_dqo.h" +#include "gve_adminq.h" +#include "gve_utils.h" +#include +#include +#include +#include +#include +#include +#include + +static int gve_buf_ref_cnt(struct gve_rx_buf_state_dqo *bs) +{ + return page_count(bs->page_info.page) - bs->page_info.pagecnt_bias; +} + +static void gve_free_page_dqo(struct gve_priv *priv, + struct gve_rx_buf_state_dqo *bs) +{ + page_ref_sub(bs->page_info.page, bs->page_info.pagecnt_bias - 1); + gve_free_page(&priv->pdev->dev, bs->page_info.page, bs->addr, + DMA_FROM_DEVICE); + bs->page_info.page = NULL; +} + +static struct gve_rx_buf_state_dqo *gve_alloc_buf_state(struct gve_rx_ring *rx) +{ + struct gve_rx_buf_state_dqo *buf_state; + s16 buffer_id; + + buffer_id = rx->dqo.free_buf_states; + if (unlikely(buffer_id == -1)) + return NULL; + + buf_state = &rx->dqo.buf_states[buffer_id]; + + /* Remove buf_state from free list */ + rx->dqo.free_buf_states = buf_state->next; + + /* Point buf_state to itself to mark it as allocated */ + buf_state->next = buffer_id; + + return buf_state; +} + +static bool gve_buf_state_is_allocated(struct gve_rx_ring *rx, + struct gve_rx_buf_state_dqo *buf_state) +{ + s16 buffer_id = buf_state - rx->dqo.buf_states; + + return buf_state->next == buffer_id; +} + +static void gve_free_buf_state(struct gve_rx_ring *rx, + struct gve_rx_buf_state_dqo *buf_state) +{ + s16 buffer_id = buf_state - rx->dqo.buf_states; + + buf_state->next = rx->dqo.free_buf_states; + rx->dqo.free_buf_states = buffer_id; +} + +static struct gve_rx_buf_state_dqo * +gve_dequeue_buf_state(struct gve_rx_ring *rx, struct gve_index_list *list) +{ + struct gve_rx_buf_state_dqo *buf_state; + s16 buffer_id; + + buffer_id = list->head; + if (unlikely(buffer_id == -1)) + return NULL; + + buf_state = &rx->dqo.buf_states[buffer_id]; + + /* Remove buf_state from list */ + list->head = buf_state->next; + if (buf_state->next == -1) + list->tail = -1; + + /* Point buf_state to itself to mark it as allocated */ + buf_state->next = buffer_id; + + return buf_state; +} + +static void gve_enqueue_buf_state(struct gve_rx_ring *rx, + struct gve_index_list *list, + struct gve_rx_buf_state_dqo *buf_state) +{ + s16 buffer_id = buf_state - rx->dqo.buf_states; + + buf_state->next = -1; + + if (list->head == -1) { + list->head = buffer_id; + list->tail = buffer_id; + } else { + int tail = list->tail; + + rx->dqo.buf_states[tail].next = buffer_id; + list->tail = buffer_id; + } +} + +static struct gve_rx_buf_state_dqo * +gve_get_recycled_buf_state(struct gve_rx_ring *rx) +{ + struct gve_rx_buf_state_dqo *buf_state; + int i; + + /* Recycled buf states are immediately usable. */ + buf_state = gve_dequeue_buf_state(rx, &rx->dqo.recycled_buf_states); + if (likely(buf_state)) + return buf_state; + + if (unlikely(rx->dqo.used_buf_states.head == -1)) + return NULL; + + /* Used buf states are only usable when ref count reaches 0, which means + * no SKBs refer to them. + * + * Search a limited number before giving up. + */ + for (i = 0; i < 5; i++) { + buf_state = gve_dequeue_buf_state(rx, &rx->dqo.used_buf_states); + if (gve_buf_ref_cnt(buf_state) == 0) + return buf_state; + + gve_enqueue_buf_state(rx, &rx->dqo.used_buf_states, buf_state); + } + + /* If there are no free buf states discard an entry from + * `used_buf_states` so it can be used. + */ + if (unlikely(rx->dqo.free_buf_states == -1)) { + buf_state = gve_dequeue_buf_state(rx, &rx->dqo.used_buf_states); + if (gve_buf_ref_cnt(buf_state) == 0) + return buf_state; + + gve_free_page_dqo(rx->gve, buf_state); + gve_free_buf_state(rx, buf_state); + } + + return NULL; +} + +static int gve_alloc_page_dqo(struct gve_priv *priv, + struct gve_rx_buf_state_dqo *buf_state) +{ + int err; + + err = gve_alloc_page(priv, &priv->pdev->dev, &buf_state->page_info.page, + &buf_state->addr, DMA_FROM_DEVICE, GFP_ATOMIC); + if (err) + return err; + + buf_state->page_info.page_offset = 0; + buf_state->page_info.page_address = + page_address(buf_state->page_info.page); + buf_state->last_single_ref_offset = 0; + + /* The page already has 1 ref. */ + page_ref_add(buf_state->page_info.page, INT_MAX - 1); + buf_state->page_info.pagecnt_bias = INT_MAX; + + return 0; +} + +static void gve_rx_free_ring_dqo(struct gve_priv *priv, int idx) +{ + struct gve_rx_ring *rx = &priv->rx[idx]; + struct device *hdev = &priv->pdev->dev; + size_t completion_queue_slots; + size_t buffer_queue_slots; + size_t size; + int i; + + completion_queue_slots = rx->dqo.complq.mask + 1; + buffer_queue_slots = rx->dqo.bufq.mask + 1; + + gve_rx_remove_from_block(priv, idx); + + if (rx->q_resources) { + dma_free_coherent(hdev, sizeof(*rx->q_resources), + rx->q_resources, rx->q_resources_bus); + rx->q_resources = NULL; + } + + for (i = 0; i < rx->dqo.num_buf_states; i++) { + struct gve_rx_buf_state_dqo *bs = &rx->dqo.buf_states[i]; + + if (bs->page_info.page) + gve_free_page_dqo(priv, bs); + } + + if (rx->dqo.bufq.desc_ring) { + size = sizeof(rx->dqo.bufq.desc_ring[0]) * buffer_queue_slots; + dma_free_coherent(hdev, size, rx->dqo.bufq.desc_ring, + rx->dqo.bufq.bus); + rx->dqo.bufq.desc_ring = NULL; + } + + if (rx->dqo.complq.desc_ring) { + size = sizeof(rx->dqo.complq.desc_ring[0]) * + completion_queue_slots; + dma_free_coherent(hdev, size, rx->dqo.complq.desc_ring, + rx->dqo.complq.bus); + rx->dqo.complq.desc_ring = NULL; + } + + kvfree(rx->dqo.buf_states); + rx->dqo.buf_states = NULL; + + netif_dbg(priv, drv, priv->dev, "freed rx ring %d\n", idx); +} + +static int gve_rx_alloc_ring_dqo(struct gve_priv *priv, int idx) +{ + struct gve_rx_ring *rx = &priv->rx[idx]; + struct device *hdev = &priv->pdev->dev; + size_t size; + int i; + + const u32 buffer_queue_slots = + priv->options_dqo_rda.rx_buff_ring_entries; + const u32 completion_queue_slots = priv->rx_desc_cnt; + + netif_dbg(priv, drv, priv->dev, "allocating rx ring DQO\n"); + + memset(rx, 0, sizeof(*rx)); + rx->gve = priv; + rx->q_num = idx; + rx->dqo.bufq.mask = buffer_queue_slots - 1; + rx->dqo.complq.num_free_slots = completion_queue_slots; + rx->dqo.complq.mask = completion_queue_slots - 1; + rx->ctx.skb_head = NULL; + rx->ctx.skb_tail = NULL; + + rx->dqo.num_buf_states = min_t(s16, S16_MAX, buffer_queue_slots * 4); + rx->dqo.buf_states = kvcalloc(rx->dqo.num_buf_states, + sizeof(rx->dqo.buf_states[0]), + GFP_KERNEL); + if (!rx->dqo.buf_states) + return -ENOMEM; + + /* Set up linked list of buffer IDs */ + for (i = 0; i < rx->dqo.num_buf_states - 1; i++) + rx->dqo.buf_states[i].next = i + 1; + + rx->dqo.buf_states[rx->dqo.num_buf_states - 1].next = -1; + rx->dqo.recycled_buf_states.head = -1; + rx->dqo.recycled_buf_states.tail = -1; + rx->dqo.used_buf_states.head = -1; + rx->dqo.used_buf_states.tail = -1; + + /* Allocate RX completion queue */ + size = sizeof(rx->dqo.complq.desc_ring[0]) * + completion_queue_slots; + rx->dqo.complq.desc_ring = + dma_alloc_coherent(hdev, size, &rx->dqo.complq.bus, GFP_KERNEL); + if (!rx->dqo.complq.desc_ring) + goto err; + + /* Allocate RX buffer queue */ + size = sizeof(rx->dqo.bufq.desc_ring[0]) * buffer_queue_slots; + rx->dqo.bufq.desc_ring = + dma_alloc_coherent(hdev, size, &rx->dqo.bufq.bus, GFP_KERNEL); + if (!rx->dqo.bufq.desc_ring) + goto err; + + rx->q_resources = dma_alloc_coherent(hdev, sizeof(*rx->q_resources), + &rx->q_resources_bus, GFP_KERNEL); + if (!rx->q_resources) + goto err; + + gve_rx_add_to_block(priv, idx); + + return 0; + +err: + gve_rx_free_ring_dqo(priv, idx); + return -ENOMEM; +} + +void gve_rx_write_doorbell_dqo(const struct gve_priv *priv, int queue_idx) +{ + const struct gve_rx_ring *rx = &priv->rx[queue_idx]; + u64 index = be32_to_cpu(rx->q_resources->db_index); + + iowrite32(rx->dqo.bufq.tail, &priv->db_bar2[index]); +} + +int gve_rx_alloc_rings_dqo(struct gve_priv *priv) +{ + int err = 0; + int i; + + for (i = 0; i < priv->rx_cfg.num_queues; i++) { + err = gve_rx_alloc_ring_dqo(priv, i); + if (err) { + netif_err(priv, drv, priv->dev, + "Failed to alloc rx ring=%d: err=%d\n", + i, err); + goto err; + } + } + + return 0; + +err: + for (i--; i >= 0; i--) + gve_rx_free_ring_dqo(priv, i); + + return err; +} + +void gve_rx_free_rings_dqo(struct gve_priv *priv) +{ + int i; + + for (i = 0; i < priv->rx_cfg.num_queues; i++) + gve_rx_free_ring_dqo(priv, i); +} + +void gve_rx_post_buffers_dqo(struct gve_rx_ring *rx) +{ + struct gve_rx_compl_queue_dqo *complq = &rx->dqo.complq; + struct gve_rx_buf_queue_dqo *bufq = &rx->dqo.bufq; + struct gve_priv *priv = rx->gve; + u32 num_avail_slots; + u32 num_full_slots; + u32 num_posted = 0; + + num_full_slots = (bufq->tail - bufq->head) & bufq->mask; + num_avail_slots = bufq->mask - num_full_slots; + + num_avail_slots = min_t(u32, num_avail_slots, complq->num_free_slots); + while (num_posted < num_avail_slots) { + struct gve_rx_desc_dqo *desc = &bufq->desc_ring[bufq->tail]; + struct gve_rx_buf_state_dqo *buf_state; + + buf_state = gve_get_recycled_buf_state(rx); + if (unlikely(!buf_state)) { + buf_state = gve_alloc_buf_state(rx); + if (unlikely(!buf_state)) + break; + + if (unlikely(gve_alloc_page_dqo(priv, buf_state))) { + u64_stats_update_begin(&rx->statss); + rx->rx_buf_alloc_fail++; + u64_stats_update_end(&rx->statss); + gve_free_buf_state(rx, buf_state); + break; + } + } + + desc->buf_id = cpu_to_le16(buf_state - rx->dqo.buf_states); + desc->buf_addr = cpu_to_le64(buf_state->addr + + buf_state->page_info.page_offset); + + bufq->tail = (bufq->tail + 1) & bufq->mask; + complq->num_free_slots--; + num_posted++; + + if ((bufq->tail & (GVE_RX_BUF_THRESH_DQO - 1)) == 0) + gve_rx_write_doorbell_dqo(priv, rx->q_num); + } + + rx->fill_cnt += num_posted; +} + +static void gve_try_recycle_buf(struct gve_priv *priv, struct gve_rx_ring *rx, + struct gve_rx_buf_state_dqo *buf_state) +{ + const int data_buffer_size = priv->data_buffer_size_dqo; + int pagecount; + + /* Can't reuse if we only fit one buffer per page */ + if (data_buffer_size * 2 > PAGE_SIZE) + goto mark_used; + + pagecount = gve_buf_ref_cnt(buf_state); + + /* Record the offset when we have a single remaining reference. + * + * When this happens, we know all of the other offsets of the page are + * usable. + */ + if (pagecount == 1) { + buf_state->last_single_ref_offset = + buf_state->page_info.page_offset; + } + + /* Use the next buffer sized chunk in the page. */ + buf_state->page_info.page_offset += data_buffer_size; + buf_state->page_info.page_offset &= (PAGE_SIZE - 1); + + /* If we wrap around to the same offset without ever dropping to 1 + * reference, then we don't know if this offset was ever freed. + */ + if (buf_state->page_info.page_offset == + buf_state->last_single_ref_offset) { + goto mark_used; + } + + gve_enqueue_buf_state(rx, &rx->dqo.recycled_buf_states, buf_state); + return; + +mark_used: + gve_enqueue_buf_state(rx, &rx->dqo.used_buf_states, buf_state); +} + +static void gve_rx_skb_csum(struct sk_buff *skb, + const struct gve_rx_compl_desc_dqo *desc, + struct gve_ptype ptype) +{ + skb->ip_summed = CHECKSUM_NONE; + + /* HW did not identify and process L3 and L4 headers. */ + if (unlikely(!desc->l3_l4_processed)) + return; + + if (ptype.l3_type == GVE_L3_TYPE_IPV4) { + if (unlikely(desc->csum_ip_err || desc->csum_external_ip_err)) + return; + } else if (ptype.l3_type == GVE_L3_TYPE_IPV6) { + /* Checksum should be skipped if this flag is set. */ + if (unlikely(desc->ipv6_ex_add)) + return; + } + + if (unlikely(desc->csum_l4_err)) + return; + + switch (ptype.l4_type) { + case GVE_L4_TYPE_TCP: + case GVE_L4_TYPE_UDP: + case GVE_L4_TYPE_ICMP: + case GVE_L4_TYPE_SCTP: + skb->ip_summed = CHECKSUM_UNNECESSARY; + break; + default: + break; + } +} + +static void gve_rx_skb_hash(struct sk_buff *skb, + const struct gve_rx_compl_desc_dqo *compl_desc, + struct gve_ptype ptype) +{ + enum pkt_hash_types hash_type = PKT_HASH_TYPE_L2; + + if (ptype.l4_type != GVE_L4_TYPE_UNKNOWN) + hash_type = PKT_HASH_TYPE_L4; + else if (ptype.l3_type != GVE_L3_TYPE_UNKNOWN) + hash_type = PKT_HASH_TYPE_L3; + + skb_set_hash(skb, le32_to_cpu(compl_desc->hash), hash_type); +} + +static void gve_rx_free_skb(struct gve_rx_ring *rx) +{ + if (!rx->ctx.skb_head) + return; + + dev_kfree_skb_any(rx->ctx.skb_head); + rx->ctx.skb_head = NULL; + rx->ctx.skb_tail = NULL; +} + +/* Chains multi skbs for single rx packet. + * Returns 0 if buffer is appended, -1 otherwise. + */ +static int gve_rx_append_frags(struct napi_struct *napi, + struct gve_rx_buf_state_dqo *buf_state, + u16 buf_len, struct gve_rx_ring *rx, + struct gve_priv *priv) +{ + int num_frags = skb_shinfo(rx->ctx.skb_tail)->nr_frags; + + if (unlikely(num_frags == MAX_SKB_FRAGS)) { + struct sk_buff *skb; + + skb = napi_alloc_skb(napi, 0); + if (!skb) + return -1; + + skb_shinfo(rx->ctx.skb_tail)->frag_list = skb; + rx->ctx.skb_tail = skb; + num_frags = 0; + } + if (rx->ctx.skb_tail != rx->ctx.skb_head) { + rx->ctx.skb_head->len += buf_len; + rx->ctx.skb_head->data_len += buf_len; + rx->ctx.skb_head->truesize += priv->data_buffer_size_dqo; + } + + skb_add_rx_frag(rx->ctx.skb_tail, num_frags, + buf_state->page_info.page, + buf_state->page_info.page_offset, + buf_len, priv->data_buffer_size_dqo); + gve_dec_pagecnt_bias(&buf_state->page_info); + + return 0; +} + +/* Returns 0 if descriptor is completed successfully. + * Returns -EINVAL if descriptor is invalid. + * Returns -ENOMEM if data cannot be copied to skb. + */ +static int gve_rx_dqo(struct napi_struct *napi, struct gve_rx_ring *rx, + const struct gve_rx_compl_desc_dqo *compl_desc, + int queue_idx) +{ + const u16 buffer_id = le16_to_cpu(compl_desc->buf_id); + const bool eop = compl_desc->end_of_packet != 0; + struct gve_rx_buf_state_dqo *buf_state; + struct gve_priv *priv = rx->gve; + u16 buf_len; + + if (unlikely(buffer_id >= rx->dqo.num_buf_states)) { + net_err_ratelimited("%s: Invalid RX buffer_id=%u\n", + priv->dev->name, buffer_id); + return -EINVAL; + } + buf_state = &rx->dqo.buf_states[buffer_id]; + if (unlikely(!gve_buf_state_is_allocated(rx, buf_state))) { + net_err_ratelimited("%s: RX buffer_id is not allocated: %u\n", + priv->dev->name, buffer_id); + return -EINVAL; + } + + if (unlikely(compl_desc->rx_error)) { + gve_enqueue_buf_state(rx, &rx->dqo.recycled_buf_states, + buf_state); + return -EINVAL; + } + + buf_len = compl_desc->packet_len; + + /* Page might have not been used for awhile and was likely last written + * by a different thread. + */ + prefetch(buf_state->page_info.page); + + /* Sync the portion of dma buffer for CPU to read. */ + dma_sync_single_range_for_cpu(&priv->pdev->dev, buf_state->addr, + buf_state->page_info.page_offset, + buf_len, DMA_FROM_DEVICE); + + /* Append to current skb if one exists. */ + if (rx->ctx.skb_head) { + if (unlikely(gve_rx_append_frags(napi, buf_state, buf_len, rx, + priv)) != 0) { + goto error; + } + + gve_try_recycle_buf(priv, rx, buf_state); + return 0; + } + + if (eop && buf_len <= priv->rx_copybreak) { + rx->ctx.skb_head = gve_rx_copy(priv->dev, napi, + &buf_state->page_info, buf_len, 0); + if (unlikely(!rx->ctx.skb_head)) + goto error; + rx->ctx.skb_tail = rx->ctx.skb_head; + + u64_stats_update_begin(&rx->statss); + rx->rx_copied_pkt++; + rx->rx_copybreak_pkt++; + u64_stats_update_end(&rx->statss); + + gve_enqueue_buf_state(rx, &rx->dqo.recycled_buf_states, + buf_state); + return 0; + } + + rx->ctx.skb_head = napi_get_frags(napi); + if (unlikely(!rx->ctx.skb_head)) + goto error; + rx->ctx.skb_tail = rx->ctx.skb_head; + + skb_add_rx_frag(rx->ctx.skb_head, 0, buf_state->page_info.page, + buf_state->page_info.page_offset, buf_len, + priv->data_buffer_size_dqo); + gve_dec_pagecnt_bias(&buf_state->page_info); + + gve_try_recycle_buf(priv, rx, buf_state); + return 0; + +error: + gve_enqueue_buf_state(rx, &rx->dqo.recycled_buf_states, buf_state); + return -ENOMEM; +} + +static int gve_rx_complete_rsc(struct sk_buff *skb, + const struct gve_rx_compl_desc_dqo *desc, + struct gve_ptype ptype) +{ + struct skb_shared_info *shinfo = skb_shinfo(skb); + + /* Only TCP is supported right now. */ + if (ptype.l4_type != GVE_L4_TYPE_TCP) + return -EINVAL; + + switch (ptype.l3_type) { + case GVE_L3_TYPE_IPV4: + shinfo->gso_type = SKB_GSO_TCPV4; + break; + case GVE_L3_TYPE_IPV6: + shinfo->gso_type = SKB_GSO_TCPV6; + break; + default: + return -EINVAL; + } + + shinfo->gso_size = le16_to_cpu(desc->rsc_seg_len); + return 0; +} + +/* Returns 0 if skb is completed successfully, -1 otherwise. */ +static int gve_rx_complete_skb(struct gve_rx_ring *rx, struct napi_struct *napi, + const struct gve_rx_compl_desc_dqo *desc, + netdev_features_t feat) +{ + struct gve_ptype ptype = + rx->gve->ptype_lut_dqo->ptypes[desc->packet_type]; + int err; + + skb_record_rx_queue(rx->ctx.skb_head, rx->q_num); + + if (feat & NETIF_F_RXHASH) + gve_rx_skb_hash(rx->ctx.skb_head, desc, ptype); + + if (feat & NETIF_F_RXCSUM) + gve_rx_skb_csum(rx->ctx.skb_head, desc, ptype); + + /* RSC packets must set gso_size otherwise the TCP stack will complain + * that packets are larger than MTU. + */ + if (desc->rsc) { + err = gve_rx_complete_rsc(rx->ctx.skb_head, desc, ptype); + if (err < 0) + return err; + } + + if (skb_headlen(rx->ctx.skb_head) == 0) + napi_gro_frags(napi); + else + napi_gro_receive(napi, rx->ctx.skb_head); + + return 0; +} + +int gve_rx_poll_dqo(struct gve_notify_block *block, int budget) +{ + struct napi_struct *napi = &block->napi; + netdev_features_t feat = napi->dev->features; + + struct gve_rx_ring *rx = block->rx; + struct gve_rx_compl_queue_dqo *complq = &rx->dqo.complq; + + u32 work_done = 0; + u64 bytes = 0; + int err; + + while (work_done < budget) { + struct gve_rx_compl_desc_dqo *compl_desc = + &complq->desc_ring[complq->head]; + u32 pkt_bytes; + + /* No more new packets */ + if (compl_desc->generation == complq->cur_gen_bit) + break; + + /* Prefetch the next two descriptors. */ + prefetch(&complq->desc_ring[(complq->head + 1) & complq->mask]); + prefetch(&complq->desc_ring[(complq->head + 2) & complq->mask]); + + /* Do not read data until we own the descriptor */ + dma_rmb(); + + err = gve_rx_dqo(napi, rx, compl_desc, rx->q_num); + if (err < 0) { + gve_rx_free_skb(rx); + u64_stats_update_begin(&rx->statss); + if (err == -ENOMEM) + rx->rx_skb_alloc_fail++; + else if (err == -EINVAL) + rx->rx_desc_err_dropped_pkt++; + u64_stats_update_end(&rx->statss); + } + + complq->head = (complq->head + 1) & complq->mask; + complq->num_free_slots++; + + /* When the ring wraps, the generation bit is flipped. */ + complq->cur_gen_bit ^= (complq->head == 0); + + /* Receiving a completion means we have space to post another + * buffer on the buffer queue. + */ + { + struct gve_rx_buf_queue_dqo *bufq = &rx->dqo.bufq; + + bufq->head = (bufq->head + 1) & bufq->mask; + } + + /* Free running counter of completed descriptors */ + rx->cnt++; + + if (!rx->ctx.skb_head) + continue; + + if (!compl_desc->end_of_packet) + continue; + + work_done++; + pkt_bytes = rx->ctx.skb_head->len; + /* The ethernet header (first ETH_HLEN bytes) is snipped off + * by eth_type_trans. + */ + if (skb_headlen(rx->ctx.skb_head)) + pkt_bytes += ETH_HLEN; + + /* gve_rx_complete_skb() will consume skb if successful */ + if (gve_rx_complete_skb(rx, napi, compl_desc, feat) != 0) { + gve_rx_free_skb(rx); + u64_stats_update_begin(&rx->statss); + rx->rx_desc_err_dropped_pkt++; + u64_stats_update_end(&rx->statss); + continue; + } + + bytes += pkt_bytes; + rx->ctx.skb_head = NULL; + rx->ctx.skb_tail = NULL; + } + + gve_rx_post_buffers_dqo(rx); + + u64_stats_update_begin(&rx->statss); + rx->rpackets += work_done; + rx->rbytes += bytes; + u64_stats_update_end(&rx->statss); + + return work_done; +} -- cgit v1.2.3