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/infiniband/hw/hfi1/ipoib_tx.c | 864 ++++++++++++++++++++++++++++++++++ 1 file changed, 864 insertions(+) create mode 100644 drivers/infiniband/hw/hfi1/ipoib_tx.c (limited to 'drivers/infiniband/hw/hfi1/ipoib_tx.c') diff --git a/drivers/infiniband/hw/hfi1/ipoib_tx.c b/drivers/infiniband/hw/hfi1/ipoib_tx.c new file mode 100644 index 000000000..5d9a7b09c --- /dev/null +++ b/drivers/infiniband/hw/hfi1/ipoib_tx.c @@ -0,0 +1,864 @@ +// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) +/* + * Copyright(c) 2020 Intel Corporation. + * + */ + +/* + * This file contains HFI1 support for IPOIB SDMA functionality + */ + +#include +#include + +#include "sdma.h" +#include "verbs.h" +#include "trace_ibhdrs.h" +#include "ipoib.h" +#include "trace_tx.h" + +/* Add a convenience helper */ +#define CIRC_ADD(val, add, size) (((val) + (add)) & ((size) - 1)) +#define CIRC_NEXT(val, size) CIRC_ADD(val, 1, size) +#define CIRC_PREV(val, size) CIRC_ADD(val, -1, size) + +struct ipoib_txparms { + struct hfi1_devdata *dd; + struct rdma_ah_attr *ah_attr; + struct hfi1_ibport *ibp; + struct hfi1_ipoib_txq *txq; + union hfi1_ipoib_flow flow; + u32 dqpn; + u8 hdr_dwords; + u8 entropy; +}; + +static struct ipoib_txreq * +hfi1_txreq_from_idx(struct hfi1_ipoib_circ_buf *r, u32 idx) +{ + return (struct ipoib_txreq *)(r->items + (idx << r->shift)); +} + +static u32 hfi1_ipoib_txreqs(const u64 sent, const u64 completed) +{ + return sent - completed; +} + +static u64 hfi1_ipoib_used(struct hfi1_ipoib_txq *txq) +{ + return hfi1_ipoib_txreqs(txq->tx_ring.sent_txreqs, + txq->tx_ring.complete_txreqs); +} + +static void hfi1_ipoib_stop_txq(struct hfi1_ipoib_txq *txq) +{ + trace_hfi1_txq_stop(txq); + if (atomic_inc_return(&txq->tx_ring.stops) == 1) + netif_stop_subqueue(txq->priv->netdev, txq->q_idx); +} + +static void hfi1_ipoib_wake_txq(struct hfi1_ipoib_txq *txq) +{ + trace_hfi1_txq_wake(txq); + if (atomic_dec_and_test(&txq->tx_ring.stops)) + netif_wake_subqueue(txq->priv->netdev, txq->q_idx); +} + +static uint hfi1_ipoib_ring_hwat(struct hfi1_ipoib_txq *txq) +{ + return min_t(uint, txq->priv->netdev->tx_queue_len, + txq->tx_ring.max_items - 1); +} + +static uint hfi1_ipoib_ring_lwat(struct hfi1_ipoib_txq *txq) +{ + return min_t(uint, txq->priv->netdev->tx_queue_len, + txq->tx_ring.max_items) >> 1; +} + +static void hfi1_ipoib_check_queue_depth(struct hfi1_ipoib_txq *txq) +{ + ++txq->tx_ring.sent_txreqs; + if (hfi1_ipoib_used(txq) >= hfi1_ipoib_ring_hwat(txq) && + !atomic_xchg(&txq->tx_ring.ring_full, 1)) { + trace_hfi1_txq_full(txq); + hfi1_ipoib_stop_txq(txq); + } +} + +static void hfi1_ipoib_check_queue_stopped(struct hfi1_ipoib_txq *txq) +{ + struct net_device *dev = txq->priv->netdev; + + /* If shutting down just return as queue state is irrelevant */ + if (unlikely(dev->reg_state != NETREG_REGISTERED)) + return; + + /* + * When the queue has been drained to less than half full it will be + * restarted. + * The size of the txreq ring is fixed at initialization. + * The tx queue len can be adjusted upward while the interface is + * running. + * The tx queue len can be large enough to overflow the txreq_ring. + * Use the minimum of the current tx_queue_len or the rings max txreqs + * to protect against ring overflow. + */ + if (hfi1_ipoib_used(txq) < hfi1_ipoib_ring_lwat(txq) && + atomic_xchg(&txq->tx_ring.ring_full, 0)) { + trace_hfi1_txq_xmit_unstopped(txq); + hfi1_ipoib_wake_txq(txq); + } +} + +static void hfi1_ipoib_free_tx(struct ipoib_txreq *tx, int budget) +{ + struct hfi1_ipoib_dev_priv *priv = tx->txq->priv; + + if (likely(!tx->sdma_status)) { + dev_sw_netstats_tx_add(priv->netdev, 1, tx->skb->len); + } else { + ++priv->netdev->stats.tx_errors; + dd_dev_warn(priv->dd, + "%s: Status = 0x%x pbc 0x%llx txq = %d sde = %d\n", + __func__, tx->sdma_status, + le64_to_cpu(tx->sdma_hdr->pbc), tx->txq->q_idx, + tx->txq->sde->this_idx); + } + + napi_consume_skb(tx->skb, budget); + tx->skb = NULL; + sdma_txclean(priv->dd, &tx->txreq); +} + +static void hfi1_ipoib_drain_tx_ring(struct hfi1_ipoib_txq *txq) +{ + struct hfi1_ipoib_circ_buf *tx_ring = &txq->tx_ring; + int i; + struct ipoib_txreq *tx; + + for (i = 0; i < tx_ring->max_items; i++) { + tx = hfi1_txreq_from_idx(tx_ring, i); + tx->complete = 0; + dev_kfree_skb_any(tx->skb); + tx->skb = NULL; + sdma_txclean(txq->priv->dd, &tx->txreq); + } + tx_ring->head = 0; + tx_ring->tail = 0; + tx_ring->complete_txreqs = 0; + tx_ring->sent_txreqs = 0; + tx_ring->avail = hfi1_ipoib_ring_hwat(txq); +} + +static int hfi1_ipoib_poll_tx_ring(struct napi_struct *napi, int budget) +{ + struct hfi1_ipoib_txq *txq = + container_of(napi, struct hfi1_ipoib_txq, napi); + struct hfi1_ipoib_circ_buf *tx_ring = &txq->tx_ring; + u32 head = tx_ring->head; + u32 max_tx = tx_ring->max_items; + int work_done; + struct ipoib_txreq *tx = hfi1_txreq_from_idx(tx_ring, head); + + trace_hfi1_txq_poll(txq); + for (work_done = 0; work_done < budget; work_done++) { + /* See hfi1_ipoib_sdma_complete() */ + if (!smp_load_acquire(&tx->complete)) + break; + tx->complete = 0; + trace_hfi1_tx_produce(tx, head); + hfi1_ipoib_free_tx(tx, budget); + head = CIRC_NEXT(head, max_tx); + tx = hfi1_txreq_from_idx(tx_ring, head); + } + tx_ring->complete_txreqs += work_done; + + /* Finished freeing tx items so store the head value. */ + smp_store_release(&tx_ring->head, head); + + hfi1_ipoib_check_queue_stopped(txq); + + if (work_done < budget) + napi_complete_done(napi, work_done); + + return work_done; +} + +static void hfi1_ipoib_sdma_complete(struct sdma_txreq *txreq, int status) +{ + struct ipoib_txreq *tx = container_of(txreq, struct ipoib_txreq, txreq); + + trace_hfi1_txq_complete(tx->txq); + tx->sdma_status = status; + /* see hfi1_ipoib_poll_tx_ring */ + smp_store_release(&tx->complete, 1); + napi_schedule_irqoff(&tx->txq->napi); +} + +static int hfi1_ipoib_build_ulp_payload(struct ipoib_txreq *tx, + struct ipoib_txparms *txp) +{ + struct hfi1_devdata *dd = txp->dd; + struct sdma_txreq *txreq = &tx->txreq; + struct sk_buff *skb = tx->skb; + int ret = 0; + int i; + + if (skb_headlen(skb)) { + ret = sdma_txadd_kvaddr(dd, txreq, skb->data, skb_headlen(skb)); + if (unlikely(ret)) + return ret; + } + + for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { + const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; + + ret = sdma_txadd_page(dd, + txreq, + skb_frag_page(frag), + frag->bv_offset, + skb_frag_size(frag)); + if (unlikely(ret)) + break; + } + + return ret; +} + +static int hfi1_ipoib_build_tx_desc(struct ipoib_txreq *tx, + struct ipoib_txparms *txp) +{ + struct hfi1_devdata *dd = txp->dd; + struct sdma_txreq *txreq = &tx->txreq; + struct hfi1_sdma_header *sdma_hdr = tx->sdma_hdr; + u16 pkt_bytes = + sizeof(sdma_hdr->pbc) + (txp->hdr_dwords << 2) + tx->skb->len; + int ret; + + ret = sdma_txinit(txreq, 0, pkt_bytes, hfi1_ipoib_sdma_complete); + if (unlikely(ret)) + return ret; + + /* add pbc + headers */ + ret = sdma_txadd_kvaddr(dd, + txreq, + sdma_hdr, + sizeof(sdma_hdr->pbc) + (txp->hdr_dwords << 2)); + if (unlikely(ret)) + return ret; + + /* add the ulp payload */ + return hfi1_ipoib_build_ulp_payload(tx, txp); +} + +static void hfi1_ipoib_build_ib_tx_headers(struct ipoib_txreq *tx, + struct ipoib_txparms *txp) +{ + struct hfi1_ipoib_dev_priv *priv = tx->txq->priv; + struct hfi1_sdma_header *sdma_hdr = tx->sdma_hdr; + struct sk_buff *skb = tx->skb; + struct hfi1_pportdata *ppd = ppd_from_ibp(txp->ibp); + struct rdma_ah_attr *ah_attr = txp->ah_attr; + struct ib_other_headers *ohdr; + struct ib_grh *grh; + u16 dwords; + u16 slid; + u16 dlid; + u16 lrh0; + u32 bth0; + u32 sqpn = (u32)(priv->netdev->dev_addr[1] << 16 | + priv->netdev->dev_addr[2] << 8 | + priv->netdev->dev_addr[3]); + u16 payload_dwords; + u8 pad_cnt; + + pad_cnt = -skb->len & 3; + + /* Includes ICRC */ + payload_dwords = ((skb->len + pad_cnt) >> 2) + SIZE_OF_CRC; + + /* header size in dwords LRH+BTH+DETH = (8+12+8)/4. */ + txp->hdr_dwords = 7; + + if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) { + grh = &sdma_hdr->hdr.ibh.u.l.grh; + txp->hdr_dwords += + hfi1_make_grh(txp->ibp, + grh, + rdma_ah_read_grh(ah_attr), + txp->hdr_dwords - LRH_9B_DWORDS, + payload_dwords); + lrh0 = HFI1_LRH_GRH; + ohdr = &sdma_hdr->hdr.ibh.u.l.oth; + } else { + lrh0 = HFI1_LRH_BTH; + ohdr = &sdma_hdr->hdr.ibh.u.oth; + } + + lrh0 |= (rdma_ah_get_sl(ah_attr) & 0xf) << 4; + lrh0 |= (txp->flow.sc5 & 0xf) << 12; + + dlid = opa_get_lid(rdma_ah_get_dlid(ah_attr), 9B); + if (dlid == be16_to_cpu(IB_LID_PERMISSIVE)) { + slid = be16_to_cpu(IB_LID_PERMISSIVE); + } else { + u16 lid = (u16)ppd->lid; + + if (lid) { + lid |= rdma_ah_get_path_bits(ah_attr) & + ((1 << ppd->lmc) - 1); + slid = lid; + } else { + slid = be16_to_cpu(IB_LID_PERMISSIVE); + } + } + + /* Includes ICRC */ + dwords = txp->hdr_dwords + payload_dwords; + + /* Build the lrh */ + sdma_hdr->hdr.hdr_type = HFI1_PKT_TYPE_9B; + hfi1_make_ib_hdr(&sdma_hdr->hdr.ibh, lrh0, dwords, dlid, slid); + + /* Build the bth */ + bth0 = (IB_OPCODE_UD_SEND_ONLY << 24) | (pad_cnt << 20) | priv->pkey; + + ohdr->bth[0] = cpu_to_be32(bth0); + ohdr->bth[1] = cpu_to_be32(txp->dqpn); + ohdr->bth[2] = cpu_to_be32(mask_psn((u32)txp->txq->tx_ring.sent_txreqs)); + + /* Build the deth */ + ohdr->u.ud.deth[0] = cpu_to_be32(priv->qkey); + ohdr->u.ud.deth[1] = cpu_to_be32((txp->entropy << + HFI1_IPOIB_ENTROPY_SHIFT) | sqpn); + + /* Construct the pbc. */ + sdma_hdr->pbc = + cpu_to_le64(create_pbc(ppd, + ib_is_sc5(txp->flow.sc5) << + PBC_DC_INFO_SHIFT, + 0, + sc_to_vlt(priv->dd, txp->flow.sc5), + dwords - SIZE_OF_CRC + + (sizeof(sdma_hdr->pbc) >> 2))); +} + +static struct ipoib_txreq *hfi1_ipoib_send_dma_common(struct net_device *dev, + struct sk_buff *skb, + struct ipoib_txparms *txp) +{ + struct hfi1_ipoib_dev_priv *priv = hfi1_ipoib_priv(dev); + struct hfi1_ipoib_txq *txq = txp->txq; + struct ipoib_txreq *tx; + struct hfi1_ipoib_circ_buf *tx_ring = &txq->tx_ring; + u32 tail = tx_ring->tail; + int ret; + + if (unlikely(!tx_ring->avail)) { + u32 head; + + if (hfi1_ipoib_used(txq) >= hfi1_ipoib_ring_hwat(txq)) + /* This shouldn't happen with a stopped queue */ + return ERR_PTR(-ENOMEM); + /* See hfi1_ipoib_poll_tx_ring() */ + head = smp_load_acquire(&tx_ring->head); + tx_ring->avail = + min_t(u32, hfi1_ipoib_ring_hwat(txq), + CIRC_CNT(head, tail, tx_ring->max_items)); + } else { + tx_ring->avail--; + } + tx = hfi1_txreq_from_idx(tx_ring, tail); + trace_hfi1_txq_alloc_tx(txq); + + /* so that we can test if the sdma descriptors are there */ + tx->txreq.num_desc = 0; + tx->txq = txq; + tx->skb = skb; + INIT_LIST_HEAD(&tx->txreq.list); + + hfi1_ipoib_build_ib_tx_headers(tx, txp); + + ret = hfi1_ipoib_build_tx_desc(tx, txp); + if (likely(!ret)) { + if (txq->flow.as_int != txp->flow.as_int) { + txq->flow.tx_queue = txp->flow.tx_queue; + txq->flow.sc5 = txp->flow.sc5; + txq->sde = + sdma_select_engine_sc(priv->dd, + txp->flow.tx_queue, + txp->flow.sc5); + trace_hfi1_flow_switch(txq); + } + + return tx; + } + + sdma_txclean(priv->dd, &tx->txreq); + + return ERR_PTR(ret); +} + +static int hfi1_ipoib_submit_tx_list(struct net_device *dev, + struct hfi1_ipoib_txq *txq) +{ + int ret; + u16 count_out; + + ret = sdma_send_txlist(txq->sde, + iowait_get_ib_work(&txq->wait), + &txq->tx_list, + &count_out); + if (likely(!ret) || ret == -EBUSY || ret == -ECOMM) + return ret; + + dd_dev_warn(txq->priv->dd, "cannot send skb tx list, err %d.\n", ret); + + return ret; +} + +static int hfi1_ipoib_flush_tx_list(struct net_device *dev, + struct hfi1_ipoib_txq *txq) +{ + int ret = 0; + + if (!list_empty(&txq->tx_list)) { + /* Flush the current list */ + ret = hfi1_ipoib_submit_tx_list(dev, txq); + + if (unlikely(ret)) + if (ret != -EBUSY) + ++dev->stats.tx_carrier_errors; + } + + return ret; +} + +static int hfi1_ipoib_submit_tx(struct hfi1_ipoib_txq *txq, + struct ipoib_txreq *tx) +{ + int ret; + + ret = sdma_send_txreq(txq->sde, + iowait_get_ib_work(&txq->wait), + &tx->txreq, + txq->pkts_sent); + if (likely(!ret)) { + txq->pkts_sent = true; + iowait_starve_clear(txq->pkts_sent, &txq->wait); + } + + return ret; +} + +static int hfi1_ipoib_send_dma_single(struct net_device *dev, + struct sk_buff *skb, + struct ipoib_txparms *txp) +{ + struct hfi1_ipoib_txq *txq = txp->txq; + struct hfi1_ipoib_circ_buf *tx_ring; + struct ipoib_txreq *tx; + int ret; + + tx = hfi1_ipoib_send_dma_common(dev, skb, txp); + if (IS_ERR(tx)) { + int ret = PTR_ERR(tx); + + dev_kfree_skb_any(skb); + + if (ret == -ENOMEM) + ++dev->stats.tx_errors; + else + ++dev->stats.tx_carrier_errors; + + return NETDEV_TX_OK; + } + + tx_ring = &txq->tx_ring; + trace_hfi1_tx_consume(tx, tx_ring->tail); + /* consume tx */ + smp_store_release(&tx_ring->tail, CIRC_NEXT(tx_ring->tail, tx_ring->max_items)); + ret = hfi1_ipoib_submit_tx(txq, tx); + if (likely(!ret)) { +tx_ok: + trace_sdma_output_ibhdr(txq->priv->dd, + &tx->sdma_hdr->hdr, + ib_is_sc5(txp->flow.sc5)); + hfi1_ipoib_check_queue_depth(txq); + return NETDEV_TX_OK; + } + + txq->pkts_sent = false; + + if (ret == -EBUSY || ret == -ECOMM) + goto tx_ok; + + /* mark complete and kick napi tx */ + smp_store_release(&tx->complete, 1); + napi_schedule(&tx->txq->napi); + + ++dev->stats.tx_carrier_errors; + + return NETDEV_TX_OK; +} + +static int hfi1_ipoib_send_dma_list(struct net_device *dev, + struct sk_buff *skb, + struct ipoib_txparms *txp) +{ + struct hfi1_ipoib_txq *txq = txp->txq; + struct hfi1_ipoib_circ_buf *tx_ring; + struct ipoib_txreq *tx; + + /* Has the flow change ? */ + if (txq->flow.as_int != txp->flow.as_int) { + int ret; + + trace_hfi1_flow_flush(txq); + ret = hfi1_ipoib_flush_tx_list(dev, txq); + if (unlikely(ret)) { + if (ret == -EBUSY) + ++dev->stats.tx_dropped; + dev_kfree_skb_any(skb); + return NETDEV_TX_OK; + } + } + tx = hfi1_ipoib_send_dma_common(dev, skb, txp); + if (IS_ERR(tx)) { + int ret = PTR_ERR(tx); + + dev_kfree_skb_any(skb); + + if (ret == -ENOMEM) + ++dev->stats.tx_errors; + else + ++dev->stats.tx_carrier_errors; + + return NETDEV_TX_OK; + } + + tx_ring = &txq->tx_ring; + trace_hfi1_tx_consume(tx, tx_ring->tail); + /* consume tx */ + smp_store_release(&tx_ring->tail, CIRC_NEXT(tx_ring->tail, tx_ring->max_items)); + list_add_tail(&tx->txreq.list, &txq->tx_list); + + hfi1_ipoib_check_queue_depth(txq); + + trace_sdma_output_ibhdr(txq->priv->dd, + &tx->sdma_hdr->hdr, + ib_is_sc5(txp->flow.sc5)); + + if (!netdev_xmit_more()) + (void)hfi1_ipoib_flush_tx_list(dev, txq); + + return NETDEV_TX_OK; +} + +static u8 hfi1_ipoib_calc_entropy(struct sk_buff *skb) +{ + if (skb_transport_header_was_set(skb)) { + u8 *hdr = (u8 *)skb_transport_header(skb); + + return (hdr[0] ^ hdr[1] ^ hdr[2] ^ hdr[3]); + } + + return (u8)skb_get_queue_mapping(skb); +} + +int hfi1_ipoib_send(struct net_device *dev, + struct sk_buff *skb, + struct ib_ah *address, + u32 dqpn) +{ + struct hfi1_ipoib_dev_priv *priv = hfi1_ipoib_priv(dev); + struct ipoib_txparms txp; + struct rdma_netdev *rn = netdev_priv(dev); + + if (unlikely(skb->len > rn->mtu + HFI1_IPOIB_ENCAP_LEN)) { + dd_dev_warn(priv->dd, "packet len %d (> %d) too long to send, dropping\n", + skb->len, + rn->mtu + HFI1_IPOIB_ENCAP_LEN); + ++dev->stats.tx_dropped; + ++dev->stats.tx_errors; + dev_kfree_skb_any(skb); + return NETDEV_TX_OK; + } + + txp.dd = priv->dd; + txp.ah_attr = &ibah_to_rvtah(address)->attr; + txp.ibp = to_iport(priv->device, priv->port_num); + txp.txq = &priv->txqs[skb_get_queue_mapping(skb)]; + txp.dqpn = dqpn; + txp.flow.sc5 = txp.ibp->sl_to_sc[rdma_ah_get_sl(txp.ah_attr)]; + txp.flow.tx_queue = (u8)skb_get_queue_mapping(skb); + txp.entropy = hfi1_ipoib_calc_entropy(skb); + + if (netdev_xmit_more() || !list_empty(&txp.txq->tx_list)) + return hfi1_ipoib_send_dma_list(dev, skb, &txp); + + return hfi1_ipoib_send_dma_single(dev, skb, &txp); +} + +/* + * hfi1_ipoib_sdma_sleep - ipoib sdma sleep function + * + * This function gets called from sdma_send_txreq() when there are not enough + * sdma descriptors available to send the packet. It adds Tx queue's wait + * structure to sdma engine's dmawait list to be woken up when descriptors + * become available. + */ +static int hfi1_ipoib_sdma_sleep(struct sdma_engine *sde, + struct iowait_work *wait, + struct sdma_txreq *txreq, + uint seq, + bool pkts_sent) +{ + struct hfi1_ipoib_txq *txq = + container_of(wait->iow, struct hfi1_ipoib_txq, wait); + + write_seqlock(&sde->waitlock); + + if (likely(txq->priv->netdev->reg_state == NETREG_REGISTERED)) { + if (sdma_progress(sde, seq, txreq)) { + write_sequnlock(&sde->waitlock); + return -EAGAIN; + } + + if (list_empty(&txreq->list)) + /* came from non-list submit */ + list_add_tail(&txreq->list, &txq->tx_list); + if (list_empty(&txq->wait.list)) { + struct hfi1_ibport *ibp = &sde->ppd->ibport_data; + + if (!atomic_xchg(&txq->tx_ring.no_desc, 1)) { + trace_hfi1_txq_queued(txq); + hfi1_ipoib_stop_txq(txq); + } + ibp->rvp.n_dmawait++; + iowait_queue(pkts_sent, wait->iow, &sde->dmawait); + } + + write_sequnlock(&sde->waitlock); + return -EBUSY; + } + + write_sequnlock(&sde->waitlock); + return -EINVAL; +} + +/* + * hfi1_ipoib_sdma_wakeup - ipoib sdma wakeup function + * + * This function gets called when SDMA descriptors becomes available and Tx + * queue's wait structure was previously added to sdma engine's dmawait list. + */ +static void hfi1_ipoib_sdma_wakeup(struct iowait *wait, int reason) +{ + struct hfi1_ipoib_txq *txq = + container_of(wait, struct hfi1_ipoib_txq, wait); + + trace_hfi1_txq_wakeup(txq); + if (likely(txq->priv->netdev->reg_state == NETREG_REGISTERED)) + iowait_schedule(wait, system_highpri_wq, WORK_CPU_UNBOUND); +} + +static void hfi1_ipoib_flush_txq(struct work_struct *work) +{ + struct iowait_work *ioww = + container_of(work, struct iowait_work, iowork); + struct iowait *wait = iowait_ioww_to_iow(ioww); + struct hfi1_ipoib_txq *txq = + container_of(wait, struct hfi1_ipoib_txq, wait); + struct net_device *dev = txq->priv->netdev; + + if (likely(dev->reg_state == NETREG_REGISTERED) && + likely(!hfi1_ipoib_flush_tx_list(dev, txq))) + if (atomic_xchg(&txq->tx_ring.no_desc, 0)) + hfi1_ipoib_wake_txq(txq); +} + +int hfi1_ipoib_txreq_init(struct hfi1_ipoib_dev_priv *priv) +{ + struct net_device *dev = priv->netdev; + u32 tx_ring_size, tx_item_size; + struct hfi1_ipoib_circ_buf *tx_ring; + int i, j; + + /* + * Ring holds 1 less than tx_ring_size + * Round up to next power of 2 in order to hold at least tx_queue_len + */ + tx_ring_size = roundup_pow_of_two(dev->tx_queue_len + 1); + tx_item_size = roundup_pow_of_two(sizeof(struct ipoib_txreq)); + + priv->txqs = kcalloc_node(dev->num_tx_queues, + sizeof(struct hfi1_ipoib_txq), + GFP_KERNEL, + priv->dd->node); + if (!priv->txqs) + return -ENOMEM; + + for (i = 0; i < dev->num_tx_queues; i++) { + struct hfi1_ipoib_txq *txq = &priv->txqs[i]; + struct ipoib_txreq *tx; + + tx_ring = &txq->tx_ring; + iowait_init(&txq->wait, + 0, + hfi1_ipoib_flush_txq, + NULL, + hfi1_ipoib_sdma_sleep, + hfi1_ipoib_sdma_wakeup, + NULL, + NULL); + txq->priv = priv; + txq->sde = NULL; + INIT_LIST_HEAD(&txq->tx_list); + atomic_set(&txq->tx_ring.stops, 0); + atomic_set(&txq->tx_ring.ring_full, 0); + atomic_set(&txq->tx_ring.no_desc, 0); + txq->q_idx = i; + txq->flow.tx_queue = 0xff; + txq->flow.sc5 = 0xff; + txq->pkts_sent = false; + + netdev_queue_numa_node_write(netdev_get_tx_queue(dev, i), + priv->dd->node); + + txq->tx_ring.items = + kvzalloc_node(array_size(tx_ring_size, tx_item_size), + GFP_KERNEL, priv->dd->node); + if (!txq->tx_ring.items) + goto free_txqs; + + txq->tx_ring.max_items = tx_ring_size; + txq->tx_ring.shift = ilog2(tx_item_size); + txq->tx_ring.avail = hfi1_ipoib_ring_hwat(txq); + tx_ring = &txq->tx_ring; + for (j = 0; j < tx_ring_size; j++) + hfi1_txreq_from_idx(tx_ring, j)->sdma_hdr = + kzalloc_node(sizeof(*tx->sdma_hdr), + GFP_KERNEL, priv->dd->node); + + netif_napi_add_tx(dev, &txq->napi, hfi1_ipoib_poll_tx_ring); + } + + return 0; + +free_txqs: + for (i--; i >= 0; i--) { + struct hfi1_ipoib_txq *txq = &priv->txqs[i]; + + netif_napi_del(&txq->napi); + tx_ring = &txq->tx_ring; + for (j = 0; j < tx_ring_size; j++) + kfree(hfi1_txreq_from_idx(tx_ring, j)->sdma_hdr); + kvfree(tx_ring->items); + } + + kfree(priv->txqs); + priv->txqs = NULL; + return -ENOMEM; +} + +static void hfi1_ipoib_drain_tx_list(struct hfi1_ipoib_txq *txq) +{ + struct sdma_txreq *txreq; + struct sdma_txreq *txreq_tmp; + + list_for_each_entry_safe(txreq, txreq_tmp, &txq->tx_list, list) { + struct ipoib_txreq *tx = + container_of(txreq, struct ipoib_txreq, txreq); + + list_del(&txreq->list); + sdma_txclean(txq->priv->dd, &tx->txreq); + dev_kfree_skb_any(tx->skb); + tx->skb = NULL; + txq->tx_ring.complete_txreqs++; + } + + if (hfi1_ipoib_used(txq)) + dd_dev_warn(txq->priv->dd, + "txq %d not empty found %u requests\n", + txq->q_idx, + hfi1_ipoib_txreqs(txq->tx_ring.sent_txreqs, + txq->tx_ring.complete_txreqs)); +} + +void hfi1_ipoib_txreq_deinit(struct hfi1_ipoib_dev_priv *priv) +{ + int i, j; + + for (i = 0; i < priv->netdev->num_tx_queues; i++) { + struct hfi1_ipoib_txq *txq = &priv->txqs[i]; + struct hfi1_ipoib_circ_buf *tx_ring = &txq->tx_ring; + + iowait_cancel_work(&txq->wait); + iowait_sdma_drain(&txq->wait); + hfi1_ipoib_drain_tx_list(txq); + netif_napi_del(&txq->napi); + hfi1_ipoib_drain_tx_ring(txq); + for (j = 0; j < tx_ring->max_items; j++) + kfree(hfi1_txreq_from_idx(tx_ring, j)->sdma_hdr); + kvfree(tx_ring->items); + } + + kfree(priv->txqs); + priv->txqs = NULL; +} + +void hfi1_ipoib_napi_tx_enable(struct net_device *dev) +{ + struct hfi1_ipoib_dev_priv *priv = hfi1_ipoib_priv(dev); + int i; + + for (i = 0; i < dev->num_tx_queues; i++) { + struct hfi1_ipoib_txq *txq = &priv->txqs[i]; + + napi_enable(&txq->napi); + } +} + +void hfi1_ipoib_napi_tx_disable(struct net_device *dev) +{ + struct hfi1_ipoib_dev_priv *priv = hfi1_ipoib_priv(dev); + int i; + + for (i = 0; i < dev->num_tx_queues; i++) { + struct hfi1_ipoib_txq *txq = &priv->txqs[i]; + + napi_disable(&txq->napi); + hfi1_ipoib_drain_tx_ring(txq); + } +} + +void hfi1_ipoib_tx_timeout(struct net_device *dev, unsigned int q) +{ + struct hfi1_ipoib_dev_priv *priv = hfi1_ipoib_priv(dev); + struct hfi1_ipoib_txq *txq = &priv->txqs[q]; + + dd_dev_info(priv->dd, "timeout txq %p q %u stopped %u stops %d no_desc %d ring_full %d\n", + txq, q, + __netif_subqueue_stopped(dev, txq->q_idx), + atomic_read(&txq->tx_ring.stops), + atomic_read(&txq->tx_ring.no_desc), + atomic_read(&txq->tx_ring.ring_full)); + dd_dev_info(priv->dd, "sde %p engine %u\n", + txq->sde, + txq->sde ? txq->sde->this_idx : 0); + dd_dev_info(priv->dd, "flow %x\n", txq->flow.as_int); + dd_dev_info(priv->dd, "sent %llu completed %llu used %llu\n", + txq->tx_ring.sent_txreqs, txq->tx_ring.complete_txreqs, + hfi1_ipoib_used(txq)); + dd_dev_info(priv->dd, "tx_queue_len %u max_items %u\n", + dev->tx_queue_len, txq->tx_ring.max_items); + dd_dev_info(priv->dd, "head %u tail %u\n", + txq->tx_ring.head, txq->tx_ring.tail); + dd_dev_info(priv->dd, "wait queued %u\n", + !list_empty(&txq->wait.list)); + dd_dev_info(priv->dd, "tx_list empty %u\n", + list_empty(&txq->tx_list)); +} + -- cgit v1.2.3