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/sfc/ef100_rep.c | 499 +++++++++++++++++++++++++++++++++++ 1 file changed, 499 insertions(+) create mode 100644 drivers/net/ethernet/sfc/ef100_rep.c (limited to 'drivers/net/ethernet/sfc/ef100_rep.c') diff --git a/drivers/net/ethernet/sfc/ef100_rep.c b/drivers/net/ethernet/sfc/ef100_rep.c new file mode 100644 index 000000000..0b3083ef0 --- /dev/null +++ b/drivers/net/ethernet/sfc/ef100_rep.c @@ -0,0 +1,499 @@ +// SPDX-License-Identifier: GPL-2.0-only +/**************************************************************************** + * Driver for Solarflare network controllers and boards + * Copyright 2019 Solarflare Communications Inc. + * Copyright 2020-2022 Xilinx Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation, incorporated herein by reference. + */ + +#include +#include "ef100_rep.h" +#include "ef100_netdev.h" +#include "ef100_nic.h" +#include "mae.h" +#include "rx_common.h" +#include "tc_bindings.h" +#include "efx_devlink.h" + +#define EFX_EF100_REP_DRIVER "efx_ef100_rep" + +#define EFX_REP_DEFAULT_PSEUDO_RING_SIZE 64 + +static int efx_ef100_rep_poll(struct napi_struct *napi, int weight); + +static int efx_ef100_rep_init_struct(struct efx_nic *efx, struct efx_rep *efv, + unsigned int i) +{ + efv->parent = efx; + efv->idx = i; + INIT_LIST_HEAD(&efv->list); + efv->dflt.fw_id = MC_CMD_MAE_ACTION_RULE_INSERT_OUT_ACTION_RULE_ID_NULL; + INIT_LIST_HEAD(&efv->dflt.acts.list); + INIT_LIST_HEAD(&efv->rx_list); + spin_lock_init(&efv->rx_lock); + efv->msg_enable = NETIF_MSG_DRV | NETIF_MSG_PROBE | + NETIF_MSG_LINK | NETIF_MSG_IFDOWN | + NETIF_MSG_IFUP | NETIF_MSG_RX_ERR | + NETIF_MSG_TX_ERR | NETIF_MSG_HW; + return 0; +} + +static int efx_ef100_rep_open(struct net_device *net_dev) +{ + struct efx_rep *efv = netdev_priv(net_dev); + + netif_napi_add(net_dev, &efv->napi, efx_ef100_rep_poll); + napi_enable(&efv->napi); + return 0; +} + +static int efx_ef100_rep_close(struct net_device *net_dev) +{ + struct efx_rep *efv = netdev_priv(net_dev); + + napi_disable(&efv->napi); + netif_napi_del(&efv->napi); + return 0; +} + +static netdev_tx_t efx_ef100_rep_xmit(struct sk_buff *skb, + struct net_device *dev) +{ + struct efx_rep *efv = netdev_priv(dev); + struct efx_nic *efx = efv->parent; + netdev_tx_t rc; + + /* __ef100_hard_start_xmit() will always return success even in the + * case of TX drops, where it will increment efx's tx_dropped. The + * efv stats really only count attempted TX, not success/failure. + */ + atomic64_inc(&efv->stats.tx_packets); + atomic64_add(skb->len, &efv->stats.tx_bytes); + netif_tx_lock(efx->net_dev); + rc = __ef100_hard_start_xmit(skb, efx, dev, efv); + netif_tx_unlock(efx->net_dev); + return rc; +} + +static int efx_ef100_rep_get_port_parent_id(struct net_device *dev, + struct netdev_phys_item_id *ppid) +{ + struct efx_rep *efv = netdev_priv(dev); + struct efx_nic *efx = efv->parent; + struct ef100_nic_data *nic_data; + + nic_data = efx->nic_data; + /* nic_data->port_id is a u8[] */ + ppid->id_len = sizeof(nic_data->port_id); + memcpy(ppid->id, nic_data->port_id, sizeof(nic_data->port_id)); + return 0; +} + +static int efx_ef100_rep_get_phys_port_name(struct net_device *dev, + char *buf, size_t len) +{ + struct efx_rep *efv = netdev_priv(dev); + struct efx_nic *efx = efv->parent; + struct ef100_nic_data *nic_data; + int ret; + + nic_data = efx->nic_data; + ret = snprintf(buf, len, "p%upf%uvf%u", efx->port_num, + nic_data->pf_index, efv->idx); + if (ret >= len) + return -EOPNOTSUPP; + + return 0; +} + +static int efx_ef100_rep_setup_tc(struct net_device *net_dev, + enum tc_setup_type type, void *type_data) +{ + struct efx_rep *efv = netdev_priv(net_dev); + struct efx_nic *efx = efv->parent; + + if (type == TC_SETUP_CLSFLOWER) + return efx_tc_flower(efx, net_dev, type_data, efv); + if (type == TC_SETUP_BLOCK) + return efx_tc_setup_block(net_dev, efx, type_data, efv); + + return -EOPNOTSUPP; +} + +static void efx_ef100_rep_get_stats64(struct net_device *dev, + struct rtnl_link_stats64 *stats) +{ + struct efx_rep *efv = netdev_priv(dev); + + stats->rx_packets = atomic64_read(&efv->stats.rx_packets); + stats->tx_packets = atomic64_read(&efv->stats.tx_packets); + stats->rx_bytes = atomic64_read(&efv->stats.rx_bytes); + stats->tx_bytes = atomic64_read(&efv->stats.tx_bytes); + stats->rx_dropped = atomic64_read(&efv->stats.rx_dropped); + stats->tx_errors = atomic64_read(&efv->stats.tx_errors); +} + +const struct net_device_ops efx_ef100_rep_netdev_ops = { + .ndo_open = efx_ef100_rep_open, + .ndo_stop = efx_ef100_rep_close, + .ndo_start_xmit = efx_ef100_rep_xmit, + .ndo_get_port_parent_id = efx_ef100_rep_get_port_parent_id, + .ndo_get_phys_port_name = efx_ef100_rep_get_phys_port_name, + .ndo_get_stats64 = efx_ef100_rep_get_stats64, + .ndo_setup_tc = efx_ef100_rep_setup_tc, +}; + +static void efx_ef100_rep_get_drvinfo(struct net_device *dev, + struct ethtool_drvinfo *drvinfo) +{ + strscpy(drvinfo->driver, EFX_EF100_REP_DRIVER, sizeof(drvinfo->driver)); +} + +static u32 efx_ef100_rep_ethtool_get_msglevel(struct net_device *net_dev) +{ + struct efx_rep *efv = netdev_priv(net_dev); + + return efv->msg_enable; +} + +static void efx_ef100_rep_ethtool_set_msglevel(struct net_device *net_dev, + u32 msg_enable) +{ + struct efx_rep *efv = netdev_priv(net_dev); + + efv->msg_enable = msg_enable; +} + +static void efx_ef100_rep_ethtool_get_ringparam(struct net_device *net_dev, + struct ethtool_ringparam *ring, + struct kernel_ethtool_ringparam *kring, + struct netlink_ext_ack *ext_ack) +{ + struct efx_rep *efv = netdev_priv(net_dev); + + ring->rx_max_pending = U32_MAX; + ring->rx_pending = efv->rx_pring_size; +} + +static int efx_ef100_rep_ethtool_set_ringparam(struct net_device *net_dev, + struct ethtool_ringparam *ring, + struct kernel_ethtool_ringparam *kring, + struct netlink_ext_ack *ext_ack) +{ + struct efx_rep *efv = netdev_priv(net_dev); + + if (ring->rx_mini_pending || ring->rx_jumbo_pending || ring->tx_pending) + return -EINVAL; + + efv->rx_pring_size = ring->rx_pending; + return 0; +} + +static const struct ethtool_ops efx_ef100_rep_ethtool_ops = { + .get_drvinfo = efx_ef100_rep_get_drvinfo, + .get_msglevel = efx_ef100_rep_ethtool_get_msglevel, + .set_msglevel = efx_ef100_rep_ethtool_set_msglevel, + .get_ringparam = efx_ef100_rep_ethtool_get_ringparam, + .set_ringparam = efx_ef100_rep_ethtool_set_ringparam, +}; + +static struct efx_rep *efx_ef100_rep_create_netdev(struct efx_nic *efx, + unsigned int i) +{ + struct net_device *net_dev; + struct efx_rep *efv; + int rc; + + net_dev = alloc_etherdev_mq(sizeof(*efv), 1); + if (!net_dev) + return ERR_PTR(-ENOMEM); + + efv = netdev_priv(net_dev); + rc = efx_ef100_rep_init_struct(efx, efv, i); + if (rc) + goto fail1; + efv->net_dev = net_dev; + rtnl_lock(); + spin_lock_bh(&efx->vf_reps_lock); + list_add_tail(&efv->list, &efx->vf_reps); + spin_unlock_bh(&efx->vf_reps_lock); + if (netif_running(efx->net_dev) && efx->state == STATE_NET_UP) { + netif_device_attach(net_dev); + netif_carrier_on(net_dev); + } else { + netif_carrier_off(net_dev); + netif_tx_stop_all_queues(net_dev); + } + rtnl_unlock(); + + net_dev->netdev_ops = &efx_ef100_rep_netdev_ops; + net_dev->ethtool_ops = &efx_ef100_rep_ethtool_ops; + net_dev->min_mtu = EFX_MIN_MTU; + net_dev->max_mtu = EFX_MAX_MTU; + net_dev->features |= NETIF_F_LLTX; + net_dev->hw_features |= NETIF_F_LLTX; + return efv; +fail1: + free_netdev(net_dev); + return ERR_PTR(rc); +} + +static int efx_ef100_configure_rep(struct efx_rep *efv) +{ + struct efx_nic *efx = efv->parent; + int rc; + + efv->rx_pring_size = EFX_REP_DEFAULT_PSEUDO_RING_SIZE; + /* Look up actual mport ID */ + rc = efx_mae_lookup_mport(efx, efv->idx, &efv->mport); + if (rc) + return rc; + pci_dbg(efx->pci_dev, "VF %u has mport ID %#x\n", efv->idx, efv->mport); + /* mport label should fit in 16 bits */ + WARN_ON(efv->mport >> 16); + + return efx_tc_configure_default_rule_rep(efv); +} + +static void efx_ef100_deconfigure_rep(struct efx_rep *efv) +{ + struct efx_nic *efx = efv->parent; + + efx_tc_deconfigure_default_rule(efx, &efv->dflt); +} + +static void efx_ef100_rep_destroy_netdev(struct efx_rep *efv) +{ + struct efx_nic *efx = efv->parent; + + rtnl_lock(); + spin_lock_bh(&efx->vf_reps_lock); + list_del(&efv->list); + spin_unlock_bh(&efx->vf_reps_lock); + rtnl_unlock(); + synchronize_rcu(); + free_netdev(efv->net_dev); +} + +int efx_ef100_vfrep_create(struct efx_nic *efx, unsigned int i) +{ + struct efx_rep *efv; + int rc; + + efv = efx_ef100_rep_create_netdev(efx, i); + if (IS_ERR(efv)) { + rc = PTR_ERR(efv); + pci_err(efx->pci_dev, + "Failed to create representor for VF %d, rc %d\n", i, + rc); + return rc; + } + rc = efx_ef100_configure_rep(efv); + if (rc) { + pci_err(efx->pci_dev, + "Failed to configure representor for VF %d, rc %d\n", + i, rc); + goto fail1; + } + ef100_rep_set_devlink_port(efv); + rc = register_netdev(efv->net_dev); + if (rc) { + pci_err(efx->pci_dev, + "Failed to register representor for VF %d, rc %d\n", + i, rc); + goto fail2; + } + pci_dbg(efx->pci_dev, "Representor for VF %d is %s\n", i, + efv->net_dev->name); + return 0; +fail2: + ef100_rep_unset_devlink_port(efv); + efx_ef100_deconfigure_rep(efv); +fail1: + efx_ef100_rep_destroy_netdev(efv); + return rc; +} + +void efx_ef100_vfrep_destroy(struct efx_nic *efx, struct efx_rep *efv) +{ + struct net_device *rep_dev; + + rep_dev = efv->net_dev; + if (!rep_dev) + return; + netif_dbg(efx, drv, rep_dev, "Removing VF representor\n"); + unregister_netdev(rep_dev); + ef100_rep_unset_devlink_port(efv); + efx_ef100_deconfigure_rep(efv); + efx_ef100_rep_destroy_netdev(efv); +} + +void efx_ef100_fini_vfreps(struct efx_nic *efx) +{ + struct ef100_nic_data *nic_data = efx->nic_data; + struct efx_rep *efv, *next; + + if (!nic_data->grp_mae) + return; + + list_for_each_entry_safe(efv, next, &efx->vf_reps, list) + efx_ef100_vfrep_destroy(efx, efv); +} + +static bool ef100_mport_is_pcie_vnic(struct mae_mport_desc *mport_desc) +{ + return mport_desc->mport_type == MAE_MPORT_DESC_MPORT_TYPE_VNIC && + mport_desc->vnic_client_type == MAE_MPORT_DESC_VNIC_CLIENT_TYPE_FUNCTION; +} + +bool ef100_mport_on_local_intf(struct efx_nic *efx, + struct mae_mport_desc *mport_desc) +{ + struct ef100_nic_data *nic_data = efx->nic_data; + bool pcie_func; + + pcie_func = ef100_mport_is_pcie_vnic(mport_desc); + + return nic_data->have_local_intf && pcie_func && + mport_desc->interface_idx == nic_data->local_mae_intf; +} + +bool ef100_mport_is_vf(struct mae_mport_desc *mport_desc) +{ + bool pcie_func; + + pcie_func = ef100_mport_is_pcie_vnic(mport_desc); + return pcie_func && (mport_desc->vf_idx != MAE_MPORT_DESC_VF_IDX_NULL); +} + +void efx_ef100_init_reps(struct efx_nic *efx) +{ + struct ef100_nic_data *nic_data = efx->nic_data; + int rc; + + nic_data->have_local_intf = false; + rc = efx_mae_enumerate_mports(efx); + if (rc) + pci_warn(efx->pci_dev, + "Could not enumerate mports (rc=%d), are we admin?", + rc); +} + +void efx_ef100_fini_reps(struct efx_nic *efx) +{ + struct efx_mae *mae = efx->mae; + + rhashtable_free_and_destroy(&mae->mports_ht, efx_mae_remove_mport, + NULL); +} + +static int efx_ef100_rep_poll(struct napi_struct *napi, int weight) +{ + struct efx_rep *efv = container_of(napi, struct efx_rep, napi); + unsigned int read_index; + struct list_head head; + struct sk_buff *skb; + bool need_resched; + int spent = 0; + + INIT_LIST_HEAD(&head); + /* Grab up to 'weight' pending SKBs */ + spin_lock_bh(&efv->rx_lock); + read_index = efv->write_index; + while (spent < weight && !list_empty(&efv->rx_list)) { + skb = list_first_entry(&efv->rx_list, struct sk_buff, list); + list_del(&skb->list); + list_add_tail(&skb->list, &head); + spent++; + } + spin_unlock_bh(&efv->rx_lock); + /* Receive them */ + netif_receive_skb_list(&head); + if (spent < weight) + if (napi_complete_done(napi, spent)) { + spin_lock_bh(&efv->rx_lock); + efv->read_index = read_index; + /* If write_index advanced while we were doing the + * RX, then storing our read_index won't re-prime the + * fake-interrupt. In that case, we need to schedule + * NAPI again to consume the additional packet(s). + */ + need_resched = efv->write_index != read_index; + spin_unlock_bh(&efv->rx_lock); + if (need_resched) + napi_schedule(&efv->napi); + } + return spent; +} + +void efx_ef100_rep_rx_packet(struct efx_rep *efv, struct efx_rx_buffer *rx_buf) +{ + u8 *eh = efx_rx_buf_va(rx_buf); + struct sk_buff *skb; + bool primed; + + /* Don't allow too many queued SKBs to build up, as they consume + * GFP_ATOMIC memory. If we overrun, just start dropping. + */ + if (efv->write_index - READ_ONCE(efv->read_index) > efv->rx_pring_size) { + atomic64_inc(&efv->stats.rx_dropped); + if (net_ratelimit()) + netif_dbg(efv->parent, rx_err, efv->net_dev, + "nodesc-dropped packet of length %u\n", + rx_buf->len); + return; + } + + skb = netdev_alloc_skb(efv->net_dev, rx_buf->len); + if (!skb) { + atomic64_inc(&efv->stats.rx_dropped); + if (net_ratelimit()) + netif_dbg(efv->parent, rx_err, efv->net_dev, + "noskb-dropped packet of length %u\n", + rx_buf->len); + return; + } + memcpy(skb->data, eh, rx_buf->len); + __skb_put(skb, rx_buf->len); + + skb_record_rx_queue(skb, 0); /* rep is single-queue */ + + /* Move past the ethernet header */ + skb->protocol = eth_type_trans(skb, efv->net_dev); + + skb_checksum_none_assert(skb); + + atomic64_inc(&efv->stats.rx_packets); + atomic64_add(rx_buf->len, &efv->stats.rx_bytes); + + /* Add it to the rx list */ + spin_lock_bh(&efv->rx_lock); + primed = efv->read_index == efv->write_index; + list_add_tail(&skb->list, &efv->rx_list); + efv->write_index++; + spin_unlock_bh(&efv->rx_lock); + /* Trigger rx work */ + if (primed) + napi_schedule(&efv->napi); +} + +struct efx_rep *efx_ef100_find_rep_by_mport(struct efx_nic *efx, u16 mport) +{ + struct efx_rep *efv, *out = NULL; + + /* spinlock guards against list mutation while we're walking it; + * but caller must also hold rcu_read_lock() to ensure the netdev + * isn't freed after we drop the spinlock. + */ + spin_lock_bh(&efx->vf_reps_lock); + list_for_each_entry(efv, &efx->vf_reps, list) + if (efv->mport == mport) { + out = efv; + break; + } + spin_unlock_bh(&efx->vf_reps_lock); + return out; +} -- cgit v1.2.3