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/target/iscsi/cxgbit/cxgbit_main.c | 746 ++++++++++++++++++++++++++++++ 1 file changed, 746 insertions(+) create mode 100644 drivers/target/iscsi/cxgbit/cxgbit_main.c (limited to 'drivers/target/iscsi/cxgbit/cxgbit_main.c') diff --git a/drivers/target/iscsi/cxgbit/cxgbit_main.c b/drivers/target/iscsi/cxgbit/cxgbit_main.c new file mode 100644 index 000000000..2c1950df3 --- /dev/null +++ b/drivers/target/iscsi/cxgbit/cxgbit_main.c @@ -0,0 +1,746 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2016 Chelsio Communications, Inc. + */ + +#define DRV_NAME "cxgbit" +#define DRV_VERSION "1.0.0-ko" +#define pr_fmt(fmt) DRV_NAME ": " fmt + +#include "cxgbit.h" + +#ifdef CONFIG_CHELSIO_T4_DCB +#include +#include "cxgb4_dcb.h" +#endif + +LIST_HEAD(cdev_list_head); +/* cdev list lock */ +DEFINE_MUTEX(cdev_list_lock); + +void _cxgbit_free_cdev(struct kref *kref) +{ + struct cxgbit_device *cdev; + + cdev = container_of(kref, struct cxgbit_device, kref); + + cxgbi_ppm_release(cdev2ppm(cdev)); + kfree(cdev); +} + +static void cxgbit_set_mdsl(struct cxgbit_device *cdev) +{ + struct cxgb4_lld_info *lldi = &cdev->lldi; + u32 mdsl; + +#define CXGBIT_T5_MAX_PDU_LEN 16224 +#define CXGBIT_PDU_NONPAYLOAD_LEN 312 /* 48(BHS) + 256(AHS) + 8(Digest) */ + if (is_t5(lldi->adapter_type)) { + mdsl = min_t(u32, lldi->iscsi_iolen - CXGBIT_PDU_NONPAYLOAD_LEN, + CXGBIT_T5_MAX_PDU_LEN - CXGBIT_PDU_NONPAYLOAD_LEN); + } else { + mdsl = lldi->iscsi_iolen - CXGBIT_PDU_NONPAYLOAD_LEN; + mdsl = min(mdsl, 16384U); + } + + mdsl = round_down(mdsl, 4); + mdsl = min_t(u32, mdsl, 4 * PAGE_SIZE); + mdsl = min_t(u32, mdsl, (MAX_SKB_FRAGS - 1) * PAGE_SIZE); + + cdev->mdsl = mdsl; +} + +static void *cxgbit_uld_add(const struct cxgb4_lld_info *lldi) +{ + struct cxgbit_device *cdev; + + if (is_t4(lldi->adapter_type)) + return ERR_PTR(-ENODEV); + + cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); + if (!cdev) + return ERR_PTR(-ENOMEM); + + kref_init(&cdev->kref); + spin_lock_init(&cdev->np_lock); + + cdev->lldi = *lldi; + + cxgbit_set_mdsl(cdev); + + if (cxgbit_ddp_init(cdev) < 0) { + kfree(cdev); + return ERR_PTR(-EINVAL); + } + + if (!test_bit(CDEV_DDP_ENABLE, &cdev->flags)) + pr_info("cdev %s ddp init failed\n", + pci_name(lldi->pdev)); + + if (lldi->fw_vers >= 0x10d2b00) + set_bit(CDEV_ISO_ENABLE, &cdev->flags); + + spin_lock_init(&cdev->cskq.lock); + INIT_LIST_HEAD(&cdev->cskq.list); + + mutex_lock(&cdev_list_lock); + list_add_tail(&cdev->list, &cdev_list_head); + mutex_unlock(&cdev_list_lock); + + pr_info("cdev %s added for iSCSI target transport\n", + pci_name(lldi->pdev)); + + return cdev; +} + +static void cxgbit_close_conn(struct cxgbit_device *cdev) +{ + struct cxgbit_sock *csk; + struct sk_buff *skb; + bool wakeup_thread = false; + + spin_lock_bh(&cdev->cskq.lock); + list_for_each_entry(csk, &cdev->cskq.list, list) { + skb = alloc_skb(0, GFP_ATOMIC); + if (!skb) + continue; + + spin_lock_bh(&csk->rxq.lock); + __skb_queue_tail(&csk->rxq, skb); + if (skb_queue_len(&csk->rxq) == 1) + wakeup_thread = true; + spin_unlock_bh(&csk->rxq.lock); + + if (wakeup_thread) { + wake_up(&csk->waitq); + wakeup_thread = false; + } + } + spin_unlock_bh(&cdev->cskq.lock); +} + +static void cxgbit_detach_cdev(struct cxgbit_device *cdev) +{ + bool free_cdev = false; + + spin_lock_bh(&cdev->cskq.lock); + if (list_empty(&cdev->cskq.list)) + free_cdev = true; + spin_unlock_bh(&cdev->cskq.lock); + + if (free_cdev) { + mutex_lock(&cdev_list_lock); + list_del(&cdev->list); + mutex_unlock(&cdev_list_lock); + + cxgbit_put_cdev(cdev); + } else { + cxgbit_close_conn(cdev); + } +} + +static int cxgbit_uld_state_change(void *handle, enum cxgb4_state state) +{ + struct cxgbit_device *cdev = handle; + + switch (state) { + case CXGB4_STATE_UP: + set_bit(CDEV_STATE_UP, &cdev->flags); + pr_info("cdev %s state UP.\n", pci_name(cdev->lldi.pdev)); + break; + case CXGB4_STATE_START_RECOVERY: + clear_bit(CDEV_STATE_UP, &cdev->flags); + cxgbit_close_conn(cdev); + pr_info("cdev %s state RECOVERY.\n", pci_name(cdev->lldi.pdev)); + break; + case CXGB4_STATE_DOWN: + pr_info("cdev %s state DOWN.\n", pci_name(cdev->lldi.pdev)); + break; + case CXGB4_STATE_DETACH: + clear_bit(CDEV_STATE_UP, &cdev->flags); + pr_info("cdev %s state DETACH.\n", pci_name(cdev->lldi.pdev)); + cxgbit_detach_cdev(cdev); + break; + default: + pr_info("cdev %s unknown state %d.\n", + pci_name(cdev->lldi.pdev), state); + break; + } + return 0; +} + +static void +cxgbit_process_ddpvld(struct cxgbit_sock *csk, struct cxgbit_lro_pdu_cb *pdu_cb, + u32 ddpvld) +{ + + if (ddpvld & (1 << CPL_RX_ISCSI_DDP_STATUS_HCRC_SHIFT)) { + pr_info("tid 0x%x, status 0x%x, hcrc bad.\n", csk->tid, ddpvld); + pdu_cb->flags |= PDUCBF_RX_HCRC_ERR; + } + + if (ddpvld & (1 << CPL_RX_ISCSI_DDP_STATUS_DCRC_SHIFT)) { + pr_info("tid 0x%x, status 0x%x, dcrc bad.\n", csk->tid, ddpvld); + pdu_cb->flags |= PDUCBF_RX_DCRC_ERR; + } + + if (ddpvld & (1 << CPL_RX_ISCSI_DDP_STATUS_PAD_SHIFT)) + pr_info("tid 0x%x, status 0x%x, pad bad.\n", csk->tid, ddpvld); + + if ((ddpvld & (1 << CPL_RX_ISCSI_DDP_STATUS_DDP_SHIFT)) && + (!(pdu_cb->flags & PDUCBF_RX_DATA))) { + pdu_cb->flags |= PDUCBF_RX_DATA_DDPD; + } +} + +static void +cxgbit_lro_add_packet_rsp(struct sk_buff *skb, u8 op, const __be64 *rsp) +{ + struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb); + struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, + lro_cb->pdu_idx); + struct cpl_rx_iscsi_ddp *cpl = (struct cpl_rx_iscsi_ddp *)(rsp + 1); + + cxgbit_process_ddpvld(lro_cb->csk, pdu_cb, be32_to_cpu(cpl->ddpvld)); + + pdu_cb->flags |= PDUCBF_RX_STATUS; + pdu_cb->ddigest = ntohl(cpl->ulp_crc); + pdu_cb->pdulen = ntohs(cpl->len); + + if (pdu_cb->flags & PDUCBF_RX_HDR) + pdu_cb->complete = true; + + lro_cb->pdu_totallen += pdu_cb->pdulen; + lro_cb->complete = true; + lro_cb->pdu_idx++; +} + +static void +cxgbit_copy_frags(struct sk_buff *skb, const struct pkt_gl *gl, + unsigned int offset) +{ + u8 skb_frag_idx = skb_shinfo(skb)->nr_frags; + u8 i; + + /* usually there's just one frag */ + __skb_fill_page_desc(skb, skb_frag_idx, gl->frags[0].page, + gl->frags[0].offset + offset, + gl->frags[0].size - offset); + for (i = 1; i < gl->nfrags; i++) + __skb_fill_page_desc(skb, skb_frag_idx + i, + gl->frags[i].page, + gl->frags[i].offset, + gl->frags[i].size); + + skb_shinfo(skb)->nr_frags += gl->nfrags; + + /* get a reference to the last page, we don't own it */ + get_page(gl->frags[gl->nfrags - 1].page); +} + +static void +cxgbit_lro_add_packet_gl(struct sk_buff *skb, u8 op, const struct pkt_gl *gl) +{ + struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb); + struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, + lro_cb->pdu_idx); + u32 len, offset; + + if (op == CPL_ISCSI_HDR) { + struct cpl_iscsi_hdr *cpl = (struct cpl_iscsi_hdr *)gl->va; + + offset = sizeof(struct cpl_iscsi_hdr); + pdu_cb->flags |= PDUCBF_RX_HDR; + pdu_cb->seq = ntohl(cpl->seq); + len = ntohs(cpl->len); + pdu_cb->hdr = gl->va + offset; + pdu_cb->hlen = len; + pdu_cb->hfrag_idx = skb_shinfo(skb)->nr_frags; + + if (unlikely(gl->nfrags > 1)) + cxgbit_skcb_flags(skb) = 0; + + lro_cb->complete = false; + } else if (op == CPL_ISCSI_DATA) { + struct cpl_iscsi_data *cpl = (struct cpl_iscsi_data *)gl->va; + + offset = sizeof(struct cpl_iscsi_data); + pdu_cb->flags |= PDUCBF_RX_DATA; + len = ntohs(cpl->len); + pdu_cb->dlen = len; + pdu_cb->doffset = lro_cb->offset; + pdu_cb->nr_dfrags = gl->nfrags; + pdu_cb->dfrag_idx = skb_shinfo(skb)->nr_frags; + lro_cb->complete = false; + } else { + struct cpl_rx_iscsi_cmp *cpl; + + cpl = (struct cpl_rx_iscsi_cmp *)gl->va; + offset = sizeof(struct cpl_rx_iscsi_cmp); + pdu_cb->flags |= (PDUCBF_RX_HDR | PDUCBF_RX_STATUS); + len = be16_to_cpu(cpl->len); + pdu_cb->hdr = gl->va + offset; + pdu_cb->hlen = len; + pdu_cb->hfrag_idx = skb_shinfo(skb)->nr_frags; + pdu_cb->ddigest = be32_to_cpu(cpl->ulp_crc); + pdu_cb->pdulen = ntohs(cpl->len); + + if (unlikely(gl->nfrags > 1)) + cxgbit_skcb_flags(skb) = 0; + + cxgbit_process_ddpvld(lro_cb->csk, pdu_cb, + be32_to_cpu(cpl->ddpvld)); + + if (pdu_cb->flags & PDUCBF_RX_DATA_DDPD) { + pdu_cb->flags |= PDUCBF_RX_DDP_CMP; + pdu_cb->complete = true; + } else if (pdu_cb->flags & PDUCBF_RX_DATA) { + pdu_cb->complete = true; + } + + lro_cb->pdu_totallen += pdu_cb->hlen + pdu_cb->dlen; + lro_cb->complete = true; + lro_cb->pdu_idx++; + } + + cxgbit_copy_frags(skb, gl, offset); + + pdu_cb->frags += gl->nfrags; + lro_cb->offset += len; + skb->len += len; + skb->data_len += len; + skb->truesize += len; +} + +static struct sk_buff * +cxgbit_lro_init_skb(struct cxgbit_sock *csk, u8 op, const struct pkt_gl *gl, + const __be64 *rsp, struct napi_struct *napi) +{ + struct sk_buff *skb; + struct cxgbit_lro_cb *lro_cb; + + skb = napi_alloc_skb(napi, LRO_SKB_MAX_HEADROOM); + + if (unlikely(!skb)) + return NULL; + + memset(skb->data, 0, LRO_SKB_MAX_HEADROOM); + + cxgbit_skcb_flags(skb) |= SKCBF_RX_LRO; + + lro_cb = cxgbit_skb_lro_cb(skb); + + cxgbit_get_csk(csk); + + lro_cb->csk = csk; + + return skb; +} + +static void cxgbit_queue_lro_skb(struct cxgbit_sock *csk, struct sk_buff *skb) +{ + bool wakeup_thread = false; + + spin_lock(&csk->rxq.lock); + __skb_queue_tail(&csk->rxq, skb); + if (skb_queue_len(&csk->rxq) == 1) + wakeup_thread = true; + spin_unlock(&csk->rxq.lock); + + if (wakeup_thread) + wake_up(&csk->waitq); +} + +static void cxgbit_lro_flush(struct t4_lro_mgr *lro_mgr, struct sk_buff *skb) +{ + struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb); + struct cxgbit_sock *csk = lro_cb->csk; + + csk->lro_skb = NULL; + + __skb_unlink(skb, &lro_mgr->lroq); + cxgbit_queue_lro_skb(csk, skb); + + cxgbit_put_csk(csk); + + lro_mgr->lro_pkts++; + lro_mgr->lro_session_cnt--; +} + +static void cxgbit_uld_lro_flush(struct t4_lro_mgr *lro_mgr) +{ + struct sk_buff *skb; + + while ((skb = skb_peek(&lro_mgr->lroq))) + cxgbit_lro_flush(lro_mgr, skb); +} + +static int +cxgbit_lro_receive(struct cxgbit_sock *csk, u8 op, const __be64 *rsp, + const struct pkt_gl *gl, struct t4_lro_mgr *lro_mgr, + struct napi_struct *napi) +{ + struct sk_buff *skb; + struct cxgbit_lro_cb *lro_cb; + + if (!csk) { + pr_err("%s: csk NULL, op 0x%x.\n", __func__, op); + goto out; + } + + if (csk->lro_skb) + goto add_packet; + +start_lro: + if (lro_mgr->lro_session_cnt >= MAX_LRO_SESSIONS) { + cxgbit_uld_lro_flush(lro_mgr); + goto start_lro; + } + + skb = cxgbit_lro_init_skb(csk, op, gl, rsp, napi); + if (unlikely(!skb)) + goto out; + + csk->lro_skb = skb; + + __skb_queue_tail(&lro_mgr->lroq, skb); + lro_mgr->lro_session_cnt++; + +add_packet: + skb = csk->lro_skb; + lro_cb = cxgbit_skb_lro_cb(skb); + + if ((gl && (((skb_shinfo(skb)->nr_frags + gl->nfrags) > + MAX_SKB_FRAGS) || (lro_cb->pdu_totallen >= LRO_FLUSH_LEN_MAX))) || + (lro_cb->pdu_idx >= MAX_SKB_FRAGS)) { + cxgbit_lro_flush(lro_mgr, skb); + goto start_lro; + } + + if (gl) + cxgbit_lro_add_packet_gl(skb, op, gl); + else + cxgbit_lro_add_packet_rsp(skb, op, rsp); + + lro_mgr->lro_merged++; + + return 0; + +out: + return -1; +} + +static int +cxgbit_uld_lro_rx_handler(void *hndl, const __be64 *rsp, + const struct pkt_gl *gl, struct t4_lro_mgr *lro_mgr, + struct napi_struct *napi) +{ + struct cxgbit_device *cdev = hndl; + struct cxgb4_lld_info *lldi = &cdev->lldi; + struct cpl_tx_data *rpl = NULL; + struct cxgbit_sock *csk = NULL; + unsigned int tid = 0; + struct sk_buff *skb; + unsigned int op = *(u8 *)rsp; + bool lro_flush = true; + + switch (op) { + case CPL_ISCSI_HDR: + case CPL_ISCSI_DATA: + case CPL_RX_ISCSI_CMP: + case CPL_RX_ISCSI_DDP: + case CPL_FW4_ACK: + lro_flush = false; + fallthrough; + case CPL_ABORT_RPL_RSS: + case CPL_PASS_ESTABLISH: + case CPL_PEER_CLOSE: + case CPL_CLOSE_CON_RPL: + case CPL_ABORT_REQ_RSS: + case CPL_SET_TCB_RPL: + case CPL_RX_DATA: + rpl = gl ? (struct cpl_tx_data *)gl->va : + (struct cpl_tx_data *)(rsp + 1); + tid = GET_TID(rpl); + csk = lookup_tid(lldi->tids, tid); + break; + default: + break; + } + + if (csk && csk->lro_skb && lro_flush) + cxgbit_lro_flush(lro_mgr, csk->lro_skb); + + if (!gl) { + unsigned int len; + + if (op == CPL_RX_ISCSI_DDP) { + if (!cxgbit_lro_receive(csk, op, rsp, NULL, lro_mgr, + napi)) + return 0; + } + + len = 64 - sizeof(struct rsp_ctrl) - 8; + skb = napi_alloc_skb(napi, len); + if (!skb) + goto nomem; + __skb_put(skb, len); + skb_copy_to_linear_data(skb, &rsp[1], len); + } else { + if (unlikely(op != *(u8 *)gl->va)) { + pr_info("? FL 0x%p,RSS%#llx,FL %#llx,len %u.\n", + gl->va, be64_to_cpu(*rsp), + get_unaligned_be64(gl->va), + gl->tot_len); + return 0; + } + + if ((op == CPL_ISCSI_HDR) || (op == CPL_ISCSI_DATA) || + (op == CPL_RX_ISCSI_CMP)) { + if (!cxgbit_lro_receive(csk, op, rsp, gl, lro_mgr, + napi)) + return 0; + } + +#define RX_PULL_LEN 128 + skb = cxgb4_pktgl_to_skb(gl, RX_PULL_LEN, RX_PULL_LEN); + if (unlikely(!skb)) + goto nomem; + } + + rpl = (struct cpl_tx_data *)skb->data; + op = rpl->ot.opcode; + cxgbit_skcb_rx_opcode(skb) = op; + + pr_debug("cdev %p, opcode 0x%x(0x%x,0x%x), skb %p.\n", + cdev, op, rpl->ot.opcode_tid, + ntohl(rpl->ot.opcode_tid), skb); + + if (op < NUM_CPL_CMDS && cxgbit_cplhandlers[op]) { + cxgbit_cplhandlers[op](cdev, skb); + } else { + pr_err("No handler for opcode 0x%x.\n", op); + __kfree_skb(skb); + } + return 0; +nomem: + pr_err("%s OOM bailing out.\n", __func__); + return 1; +} + +#ifdef CONFIG_CHELSIO_T4_DCB +struct cxgbit_dcb_work { + struct dcb_app_type dcb_app; + struct work_struct work; +}; + +static void +cxgbit_update_dcb_priority(struct cxgbit_device *cdev, u8 port_id, + u8 dcb_priority, u16 port_num) +{ + struct cxgbit_sock *csk; + struct sk_buff *skb; + u16 local_port; + bool wakeup_thread = false; + + spin_lock_bh(&cdev->cskq.lock); + list_for_each_entry(csk, &cdev->cskq.list, list) { + if (csk->port_id != port_id) + continue; + + if (csk->com.local_addr.ss_family == AF_INET6) { + struct sockaddr_in6 *sock_in6; + + sock_in6 = (struct sockaddr_in6 *)&csk->com.local_addr; + local_port = ntohs(sock_in6->sin6_port); + } else { + struct sockaddr_in *sock_in; + + sock_in = (struct sockaddr_in *)&csk->com.local_addr; + local_port = ntohs(sock_in->sin_port); + } + + if (local_port != port_num) + continue; + + if (csk->dcb_priority == dcb_priority) + continue; + + skb = alloc_skb(0, GFP_ATOMIC); + if (!skb) + continue; + + spin_lock(&csk->rxq.lock); + __skb_queue_tail(&csk->rxq, skb); + if (skb_queue_len(&csk->rxq) == 1) + wakeup_thread = true; + spin_unlock(&csk->rxq.lock); + + if (wakeup_thread) { + wake_up(&csk->waitq); + wakeup_thread = false; + } + } + spin_unlock_bh(&cdev->cskq.lock); +} + +static void cxgbit_dcb_workfn(struct work_struct *work) +{ + struct cxgbit_dcb_work *dcb_work; + struct net_device *ndev; + struct cxgbit_device *cdev = NULL; + struct dcb_app_type *iscsi_app; + u8 priority, port_id = 0xff; + + dcb_work = container_of(work, struct cxgbit_dcb_work, work); + iscsi_app = &dcb_work->dcb_app; + + if (iscsi_app->dcbx & DCB_CAP_DCBX_VER_IEEE) { + if ((iscsi_app->app.selector != IEEE_8021QAZ_APP_SEL_STREAM) && + (iscsi_app->app.selector != IEEE_8021QAZ_APP_SEL_ANY)) + goto out; + + priority = iscsi_app->app.priority; + + } else if (iscsi_app->dcbx & DCB_CAP_DCBX_VER_CEE) { + if (iscsi_app->app.selector != DCB_APP_IDTYPE_PORTNUM) + goto out; + + if (!iscsi_app->app.priority) + goto out; + + priority = ffs(iscsi_app->app.priority) - 1; + } else { + goto out; + } + + pr_debug("priority for ifid %d is %u\n", + iscsi_app->ifindex, priority); + + ndev = dev_get_by_index(&init_net, iscsi_app->ifindex); + + if (!ndev) + goto out; + + mutex_lock(&cdev_list_lock); + cdev = cxgbit_find_device(ndev, &port_id); + + dev_put(ndev); + + if (!cdev) { + mutex_unlock(&cdev_list_lock); + goto out; + } + + cxgbit_update_dcb_priority(cdev, port_id, priority, + iscsi_app->app.protocol); + mutex_unlock(&cdev_list_lock); +out: + kfree(dcb_work); +} + +static int +cxgbit_dcbevent_notify(struct notifier_block *nb, unsigned long action, + void *data) +{ + struct cxgbit_dcb_work *dcb_work; + struct dcb_app_type *dcb_app = data; + + dcb_work = kzalloc(sizeof(*dcb_work), GFP_ATOMIC); + if (!dcb_work) + return NOTIFY_DONE; + + dcb_work->dcb_app = *dcb_app; + INIT_WORK(&dcb_work->work, cxgbit_dcb_workfn); + schedule_work(&dcb_work->work); + return NOTIFY_OK; +} +#endif + +static enum target_prot_op cxgbit_get_sup_prot_ops(struct iscsit_conn *conn) +{ + return TARGET_PROT_NORMAL; +} + +static struct iscsit_transport cxgbit_transport = { + .name = DRV_NAME, + .transport_type = ISCSI_CXGBIT, + .rdma_shutdown = false, + .priv_size = sizeof(struct cxgbit_cmd), + .owner = THIS_MODULE, + .iscsit_setup_np = cxgbit_setup_np, + .iscsit_accept_np = cxgbit_accept_np, + .iscsit_free_np = cxgbit_free_np, + .iscsit_free_conn = cxgbit_free_conn, + .iscsit_get_login_rx = cxgbit_get_login_rx, + .iscsit_put_login_tx = cxgbit_put_login_tx, + .iscsit_immediate_queue = iscsit_immediate_queue, + .iscsit_response_queue = iscsit_response_queue, + .iscsit_get_dataout = iscsit_build_r2ts_for_cmd, + .iscsit_queue_data_in = iscsit_queue_rsp, + .iscsit_queue_status = iscsit_queue_rsp, + .iscsit_xmit_pdu = cxgbit_xmit_pdu, + .iscsit_get_r2t_ttt = cxgbit_get_r2t_ttt, + .iscsit_get_rx_pdu = cxgbit_get_rx_pdu, + .iscsit_validate_params = cxgbit_validate_params, + .iscsit_unmap_cmd = cxgbit_unmap_cmd, + .iscsit_aborted_task = iscsit_aborted_task, + .iscsit_get_sup_prot_ops = cxgbit_get_sup_prot_ops, +}; + +static struct cxgb4_uld_info cxgbit_uld_info = { + .name = DRV_NAME, + .nrxq = MAX_ULD_QSETS, + .ntxq = MAX_ULD_QSETS, + .rxq_size = 1024, + .lro = true, + .add = cxgbit_uld_add, + .state_change = cxgbit_uld_state_change, + .lro_rx_handler = cxgbit_uld_lro_rx_handler, + .lro_flush = cxgbit_uld_lro_flush, +}; + +#ifdef CONFIG_CHELSIO_T4_DCB +static struct notifier_block cxgbit_dcbevent_nb = { + .notifier_call = cxgbit_dcbevent_notify, +}; +#endif + +static int __init cxgbit_init(void) +{ + cxgb4_register_uld(CXGB4_ULD_ISCSIT, &cxgbit_uld_info); + iscsit_register_transport(&cxgbit_transport); + +#ifdef CONFIG_CHELSIO_T4_DCB + pr_info("%s dcb enabled.\n", DRV_NAME); + register_dcbevent_notifier(&cxgbit_dcbevent_nb); +#endif + BUILD_BUG_ON(sizeof_field(struct sk_buff, cb) < + sizeof(union cxgbit_skb_cb)); + return 0; +} + +static void __exit cxgbit_exit(void) +{ + struct cxgbit_device *cdev, *tmp; + +#ifdef CONFIG_CHELSIO_T4_DCB + unregister_dcbevent_notifier(&cxgbit_dcbevent_nb); +#endif + mutex_lock(&cdev_list_lock); + list_for_each_entry_safe(cdev, tmp, &cdev_list_head, list) { + list_del(&cdev->list); + cxgbit_put_cdev(cdev); + } + mutex_unlock(&cdev_list_lock); + iscsit_unregister_transport(&cxgbit_transport); + cxgb4_unregister_uld(CXGB4_ULD_ISCSIT); +} + +module_init(cxgbit_init); +module_exit(cxgbit_exit); + +MODULE_DESCRIPTION("Chelsio iSCSI target offload driver"); +MODULE_AUTHOR("Chelsio Communications"); +MODULE_VERSION(DRV_VERSION); +MODULE_LICENSE("GPL"); -- cgit v1.2.3