Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 683 insertions, 0 deletions

diff --git a/drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.c b/drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.c
new file mode 100644
index 000000000..46514208d
--- /dev/null
+++ b/drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.c
@@ -0,0 +1,683 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ *  Amir Hanania <amir.hanania@intel.com>
+ *  Haijun Liu <haijun.liu@mediatek.com>
+ *  Eliot Lee <eliot.lee@intel.com>
+ *  Moises Veleta <moises.veleta@intel.com>
+ *  Ricardo Martinez <ricardo.martinez@linux.intel.com>
+ *
+ * Contributors:
+ *  Chiranjeevi Rapolu <chiranjeevi.rapolu@intel.com>
+ *  Sreehari Kancharla <sreehari.kancharla@intel.com>
+ */
+
+#include <linux/atomic.h>
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dma-direction.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/gfp.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/list.h>
+#include <linux/minmax.h>
+#include <linux/netdevice.h>
+#include <linux/pm_runtime.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/skbuff.h>
+#include <linux/types.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+
+#include "t7xx_dpmaif.h"
+#include "t7xx_hif_dpmaif.h"
+#include "t7xx_hif_dpmaif_tx.h"
+#include "t7xx_pci.h"
+
+#define DPMAIF_SKB_TX_BURST_CNT	5
+#define DPMAIF_DRB_LIST_LEN	6144
+
+/* DRB dtype */
+#define DES_DTYP_PD		0
+#define DES_DTYP_MSG		1
+
+static unsigned int t7xx_dpmaif_update_drb_rd_idx(struct dpmaif_ctrl *dpmaif_ctrl,
+						  unsigned int q_num)
+{
+	struct dpmaif_tx_queue *txq = &dpmaif_ctrl->txq[q_num];
+	unsigned int old_sw_rd_idx, new_hw_rd_idx, drb_cnt;
+	unsigned long flags;
+
+	if (!txq->que_started)
+		return 0;
+
+	old_sw_rd_idx = txq->drb_rd_idx;
+	new_hw_rd_idx = t7xx_dpmaif_ul_get_rd_idx(&dpmaif_ctrl->hw_info, q_num);
+	if (new_hw_rd_idx >= DPMAIF_DRB_LIST_LEN) {
+		dev_err(dpmaif_ctrl->dev, "Out of range read index: %u\n", new_hw_rd_idx);
+		return 0;
+	}
+
+	if (old_sw_rd_idx <= new_hw_rd_idx)
+		drb_cnt = new_hw_rd_idx - old_sw_rd_idx;
+	else
+		drb_cnt = txq->drb_size_cnt - old_sw_rd_idx + new_hw_rd_idx;
+
+	spin_lock_irqsave(&txq->tx_lock, flags);
+	txq->drb_rd_idx = new_hw_rd_idx;
+	spin_unlock_irqrestore(&txq->tx_lock, flags);
+
+	return drb_cnt;
+}
+
+static unsigned int t7xx_dpmaif_release_tx_buffer(struct dpmaif_ctrl *dpmaif_ctrl,
+						  unsigned int q_num, unsigned int release_cnt)
+{
+	struct dpmaif_tx_queue *txq = &dpmaif_ctrl->txq[q_num];
+	struct dpmaif_callbacks *cb = dpmaif_ctrl->callbacks;
+	struct dpmaif_drb_skb *cur_drb_skb, *drb_skb_base;
+	struct dpmaif_drb *cur_drb, *drb_base;
+	unsigned int drb_cnt, i, cur_idx;
+	unsigned long flags;
+
+	drb_skb_base = txq->drb_skb_base;
+	drb_base = txq->drb_base;
+
+	spin_lock_irqsave(&txq->tx_lock, flags);
+	drb_cnt = txq->drb_size_cnt;
+	cur_idx = txq->drb_release_rd_idx;
+	spin_unlock_irqrestore(&txq->tx_lock, flags);
+
+	for (i = 0; i < release_cnt; i++) {
+		cur_drb = drb_base + cur_idx;
+		if (FIELD_GET(DRB_HDR_DTYP, le32_to_cpu(cur_drb->header)) == DES_DTYP_PD) {
+			cur_drb_skb = drb_skb_base + cur_idx;
+			if (!cur_drb_skb->is_msg)
+				dma_unmap_single(dpmaif_ctrl->dev, cur_drb_skb->bus_addr,
+						 cur_drb_skb->data_len, DMA_TO_DEVICE);
+
+			if (!FIELD_GET(DRB_HDR_CONT, le32_to_cpu(cur_drb->header))) {
+				if (!cur_drb_skb->skb) {
+					dev_err(dpmaif_ctrl->dev,
+						"txq%u: DRB check fail, invalid skb\n", q_num);
+					continue;
+				}
+
+				dev_kfree_skb_any(cur_drb_skb->skb);
+			}
+
+			cur_drb_skb->skb = NULL;
+		}
+
+		spin_lock_irqsave(&txq->tx_lock, flags);
+		cur_idx = t7xx_ring_buf_get_next_wr_idx(drb_cnt, cur_idx);
+		txq->drb_release_rd_idx = cur_idx;
+		spin_unlock_irqrestore(&txq->tx_lock, flags);
+
+		if (atomic_inc_return(&txq->tx_budget) > txq->drb_size_cnt / 8)
+			cb->state_notify(dpmaif_ctrl->t7xx_dev, DMPAIF_TXQ_STATE_IRQ, txq->index);
+	}
+
+	if (FIELD_GET(DRB_HDR_CONT, le32_to_cpu(cur_drb->header)))
+		dev_err(dpmaif_ctrl->dev, "txq%u: DRB not marked as the last one\n", q_num);
+
+	return i;
+}
+
+static int t7xx_dpmaif_tx_release(struct dpmaif_ctrl *dpmaif_ctrl,
+				  unsigned int q_num, unsigned int budget)
+{
+	struct dpmaif_tx_queue *txq = &dpmaif_ctrl->txq[q_num];
+	unsigned int rel_cnt, real_rel_cnt;
+
+	/* Update read index from HW */
+	t7xx_dpmaif_update_drb_rd_idx(dpmaif_ctrl, q_num);
+
+	rel_cnt = t7xx_ring_buf_rd_wr_count(txq->drb_size_cnt, txq->drb_release_rd_idx,
+					    txq->drb_rd_idx, DPMAIF_READ);
+
+	real_rel_cnt = min_not_zero(budget, rel_cnt);
+	if (real_rel_cnt)
+		real_rel_cnt = t7xx_dpmaif_release_tx_buffer(dpmaif_ctrl, q_num, real_rel_cnt);
+
+	return real_rel_cnt < rel_cnt ? -EAGAIN : 0;
+}
+
+static bool t7xx_dpmaif_drb_ring_not_empty(struct dpmaif_tx_queue *txq)
+{
+	return !!t7xx_dpmaif_update_drb_rd_idx(txq->dpmaif_ctrl, txq->index);
+}
+
+static void t7xx_dpmaif_tx_done(struct work_struct *work)
+{
+	struct dpmaif_tx_queue *txq = container_of(work, struct dpmaif_tx_queue, dpmaif_tx_work);
+	struct dpmaif_ctrl *dpmaif_ctrl = txq->dpmaif_ctrl;
+	struct dpmaif_hw_info *hw_info;
+	int ret;
+
+	ret = pm_runtime_resume_and_get(dpmaif_ctrl->dev);
+	if (ret < 0 && ret != -EACCES)
+		return;
+
+	/* The device may be in low power state. Disable sleep if needed */
+	t7xx_pci_disable_sleep(dpmaif_ctrl->t7xx_dev);
+	if (t7xx_pci_sleep_disable_complete(dpmaif_ctrl->t7xx_dev)) {
+		hw_info = &dpmaif_ctrl->hw_info;
+		ret = t7xx_dpmaif_tx_release(dpmaif_ctrl, txq->index, txq->drb_size_cnt);
+		if (ret == -EAGAIN ||
+		    (t7xx_dpmaif_ul_clr_done(hw_info, txq->index) &&
+		     t7xx_dpmaif_drb_ring_not_empty(txq))) {
+			queue_work(dpmaif_ctrl->txq[txq->index].worker,
+				   &dpmaif_ctrl->txq[txq->index].dpmaif_tx_work);
+			/* Give the device time to enter the low power state */
+			t7xx_dpmaif_clr_ip_busy_sts(hw_info);
+		} else {
+			t7xx_dpmaif_clr_ip_busy_sts(hw_info);
+			t7xx_dpmaif_unmask_ulq_intr(hw_info, txq->index);
+		}
+	}
+
+	t7xx_pci_enable_sleep(dpmaif_ctrl->t7xx_dev);
+	pm_runtime_mark_last_busy(dpmaif_ctrl->dev);
+	pm_runtime_put_autosuspend(dpmaif_ctrl->dev);
+}
+
+static void t7xx_setup_msg_drb(struct dpmaif_ctrl *dpmaif_ctrl, unsigned int q_num,
+			       unsigned int cur_idx, unsigned int pkt_len, unsigned int count_l,
+			       unsigned int channel_id)
+{
+	struct dpmaif_drb *drb_base = dpmaif_ctrl->txq[q_num].drb_base;
+	struct dpmaif_drb *drb = drb_base + cur_idx;
+
+	drb->header = cpu_to_le32(FIELD_PREP(DRB_HDR_DTYP, DES_DTYP_MSG) |
+				  FIELD_PREP(DRB_HDR_CONT, 1) |
+				  FIELD_PREP(DRB_HDR_DATA_LEN, pkt_len));
+
+	drb->msg.msg_hdr = cpu_to_le32(FIELD_PREP(DRB_MSG_COUNT_L, count_l) |
+				       FIELD_PREP(DRB_MSG_CHANNEL_ID, channel_id) |
+				       FIELD_PREP(DRB_MSG_L4_CHK, 1));
+}
+
+static void t7xx_setup_payload_drb(struct dpmaif_ctrl *dpmaif_ctrl, unsigned int q_num,
+				   unsigned int cur_idx, dma_addr_t data_addr,
+				   unsigned int pkt_size, bool last_one)
+{
+	struct dpmaif_drb *drb_base = dpmaif_ctrl->txq[q_num].drb_base;
+	struct dpmaif_drb *drb = drb_base + cur_idx;
+	u32 header;
+
+	header = FIELD_PREP(DRB_HDR_DTYP, DES_DTYP_PD) | FIELD_PREP(DRB_HDR_DATA_LEN, pkt_size);
+	if (!last_one)
+		header |= FIELD_PREP(DRB_HDR_CONT, 1);
+
+	drb->header = cpu_to_le32(header);
+	drb->pd.data_addr_l = cpu_to_le32(lower_32_bits(data_addr));
+	drb->pd.data_addr_h = cpu_to_le32(upper_32_bits(data_addr));
+}
+
+static void t7xx_record_drb_skb(struct dpmaif_ctrl *dpmaif_ctrl, unsigned int q_num,
+				unsigned int cur_idx, struct sk_buff *skb, bool is_msg,
+				bool is_frag, bool is_last_one, dma_addr_t bus_addr,
+				unsigned int data_len)
+{
+	struct dpmaif_drb_skb *drb_skb_base = dpmaif_ctrl->txq[q_num].drb_skb_base;
+	struct dpmaif_drb_skb *drb_skb = drb_skb_base + cur_idx;
+
+	drb_skb->skb = skb;
+	drb_skb->bus_addr = bus_addr;
+	drb_skb->data_len = data_len;
+	drb_skb->index = cur_idx;
+	drb_skb->is_msg = is_msg;
+	drb_skb->is_frag = is_frag;
+	drb_skb->is_last = is_last_one;
+}
+
+static int t7xx_dpmaif_add_skb_to_ring(struct dpmaif_ctrl *dpmaif_ctrl, struct sk_buff *skb)
+{
+	struct dpmaif_callbacks *cb = dpmaif_ctrl->callbacks;
+	unsigned int wr_cnt, send_cnt, payload_cnt;
+	unsigned int cur_idx, drb_wr_idx_backup;
+	struct skb_shared_info *shinfo;
+	struct dpmaif_tx_queue *txq;
+	struct t7xx_skb_cb *skb_cb;
+	unsigned long flags;
+
+	skb_cb = T7XX_SKB_CB(skb);
+	txq = &dpmaif_ctrl->txq[skb_cb->txq_number];
+	if (!txq->que_started || dpmaif_ctrl->state != DPMAIF_STATE_PWRON)
+		return -ENODEV;
+
+	atomic_set(&txq->tx_processing, 1);
+	 /* Ensure tx_processing is changed to 1 before actually begin TX flow */
+	smp_mb();
+
+	shinfo = skb_shinfo(skb);
+	if (shinfo->frag_list)
+		dev_warn_ratelimited(dpmaif_ctrl->dev, "frag_list not supported\n");
+
+	payload_cnt = shinfo->nr_frags + 1;
+	/* nr_frags: frag cnt, 1: skb->data, 1: msg DRB */
+	send_cnt = payload_cnt + 1;
+
+	spin_lock_irqsave(&txq->tx_lock, flags);
+	cur_idx = txq->drb_wr_idx;
+	drb_wr_idx_backup = cur_idx;
+	txq->drb_wr_idx += send_cnt;
+	if (txq->drb_wr_idx >= txq->drb_size_cnt)
+		txq->drb_wr_idx -= txq->drb_size_cnt;
+	t7xx_setup_msg_drb(dpmaif_ctrl, txq->index, cur_idx, skb->len, 0, skb_cb->netif_idx);
+	t7xx_record_drb_skb(dpmaif_ctrl, txq->index, cur_idx, skb, true, 0, 0, 0, 0);
+	spin_unlock_irqrestore(&txq->tx_lock, flags);
+
+	for (wr_cnt = 0; wr_cnt < payload_cnt; wr_cnt++) {
+		bool is_frag, is_last_one = wr_cnt == payload_cnt - 1;
+		unsigned int data_len;
+		dma_addr_t bus_addr;
+		void *data_addr;
+
+		if (!wr_cnt) {
+			data_len = skb_headlen(skb);
+			data_addr = skb->data;
+			is_frag = false;
+		} else {
+			skb_frag_t *frag = shinfo->frags + wr_cnt - 1;
+
+			data_len = skb_frag_size(frag);
+			data_addr = skb_frag_address(frag);
+			is_frag = true;
+		}
+
+		bus_addr = dma_map_single(dpmaif_ctrl->dev, data_addr, data_len, DMA_TO_DEVICE);
+		if (dma_mapping_error(dpmaif_ctrl->dev, bus_addr))
+			goto unmap_buffers;
+
+		cur_idx = t7xx_ring_buf_get_next_wr_idx(txq->drb_size_cnt, cur_idx);
+
+		spin_lock_irqsave(&txq->tx_lock, flags);
+		t7xx_setup_payload_drb(dpmaif_ctrl, txq->index, cur_idx, bus_addr, data_len,
+				       is_last_one);
+		t7xx_record_drb_skb(dpmaif_ctrl, txq->index, cur_idx, skb, false, is_frag,
+				    is_last_one, bus_addr, data_len);
+		spin_unlock_irqrestore(&txq->tx_lock, flags);
+	}
+
+	if (atomic_sub_return(send_cnt, &txq->tx_budget) <= (MAX_SKB_FRAGS + 2))
+		cb->state_notify(dpmaif_ctrl->t7xx_dev, DMPAIF_TXQ_STATE_FULL, txq->index);
+
+	atomic_set(&txq->tx_processing, 0);
+
+	return 0;
+
+unmap_buffers:
+	while (wr_cnt--) {
+		struct dpmaif_drb_skb *drb_skb = txq->drb_skb_base;
+
+		cur_idx = cur_idx ? cur_idx - 1 : txq->drb_size_cnt - 1;
+		drb_skb += cur_idx;
+		dma_unmap_single(dpmaif_ctrl->dev, drb_skb->bus_addr,
+				 drb_skb->data_len, DMA_TO_DEVICE);
+	}
+
+	txq->drb_wr_idx = drb_wr_idx_backup;
+	atomic_set(&txq->tx_processing, 0);
+
+	return -ENOMEM;
+}
+
+static bool t7xx_tx_lists_are_all_empty(const struct dpmaif_ctrl *dpmaif_ctrl)
+{
+	int i;
+
+	for (i = 0; i < DPMAIF_TXQ_NUM; i++) {
+		if (!skb_queue_empty(&dpmaif_ctrl->txq[i].tx_skb_head))
+			return false;
+	}
+
+	return true;
+}
+
+/* Currently, only the default TX queue is used */
+static struct dpmaif_tx_queue *t7xx_select_tx_queue(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+	struct dpmaif_tx_queue *txq;
+
+	txq = &dpmaif_ctrl->txq[DPMAIF_TX_DEFAULT_QUEUE];
+	if (!txq->que_started)
+		return NULL;
+
+	return txq;
+}
+
+static unsigned int t7xx_txq_drb_wr_available(struct dpmaif_tx_queue *txq)
+{
+	return t7xx_ring_buf_rd_wr_count(txq->drb_size_cnt, txq->drb_release_rd_idx,
+					 txq->drb_wr_idx, DPMAIF_WRITE);
+}
+
+static unsigned int t7xx_skb_drb_cnt(struct sk_buff *skb)
+{
+	/* Normal DRB (frags data + skb linear data) + msg DRB */
+	return skb_shinfo(skb)->nr_frags + 2;
+}
+
+static int t7xx_txq_burst_send_skb(struct dpmaif_tx_queue *txq)
+{
+	unsigned int drb_remain_cnt, i;
+	unsigned int send_drb_cnt;
+	int drb_cnt = 0;
+	int ret = 0;
+
+	drb_remain_cnt = t7xx_txq_drb_wr_available(txq);
+
+	for (i = 0; i < DPMAIF_SKB_TX_BURST_CNT; i++) {
+		struct sk_buff *skb;
+
+		skb = skb_peek(&txq->tx_skb_head);
+		if (!skb)
+			break;
+
+		send_drb_cnt = t7xx_skb_drb_cnt(skb);
+		if (drb_remain_cnt < send_drb_cnt) {
+			drb_remain_cnt = t7xx_txq_drb_wr_available(txq);
+			continue;
+		}
+
+		drb_remain_cnt -= send_drb_cnt;
+
+		ret = t7xx_dpmaif_add_skb_to_ring(txq->dpmaif_ctrl, skb);
+		if (ret < 0) {
+			dev_err(txq->dpmaif_ctrl->dev,
+				"Failed to add skb to device's ring: %d\n", ret);
+			break;
+		}
+
+		drb_cnt += send_drb_cnt;
+		skb_unlink(skb, &txq->tx_skb_head);
+	}
+
+	if (drb_cnt > 0)
+		return drb_cnt;
+
+	return ret;
+}
+
+static void t7xx_do_tx_hw_push(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+	bool wait_disable_sleep = true;
+
+	do {
+		struct dpmaif_tx_queue *txq;
+		int drb_send_cnt;
+
+		txq = t7xx_select_tx_queue(dpmaif_ctrl);
+		if (!txq)
+			return;
+
+		drb_send_cnt = t7xx_txq_burst_send_skb(txq);
+		if (drb_send_cnt <= 0) {
+			usleep_range(10, 20);
+			cond_resched();
+			continue;
+		}
+
+		/* Wait for the PCIe resource to unlock */
+		if (wait_disable_sleep) {
+			if (!t7xx_pci_sleep_disable_complete(dpmaif_ctrl->t7xx_dev))
+				return;
+
+			wait_disable_sleep = false;
+		}
+
+		t7xx_dpmaif_ul_update_hw_drb_cnt(&dpmaif_ctrl->hw_info, txq->index,
+						 drb_send_cnt * DPMAIF_UL_DRB_SIZE_WORD);
+
+		cond_resched();
+	} while (!t7xx_tx_lists_are_all_empty(dpmaif_ctrl) && !kthread_should_stop() &&
+		 (dpmaif_ctrl->state == DPMAIF_STATE_PWRON));
+}
+
+static int t7xx_dpmaif_tx_hw_push_thread(void *arg)
+{
+	struct dpmaif_ctrl *dpmaif_ctrl = arg;
+	int ret;
+
+	while (!kthread_should_stop()) {
+		if (t7xx_tx_lists_are_all_empty(dpmaif_ctrl) ||
+		    dpmaif_ctrl->state != DPMAIF_STATE_PWRON) {
+			if (wait_event_interruptible(dpmaif_ctrl->tx_wq,
+						     (!t7xx_tx_lists_are_all_empty(dpmaif_ctrl) &&
+						     dpmaif_ctrl->state == DPMAIF_STATE_PWRON) ||
+						     kthread_should_stop()))
+				continue;
+
+			if (kthread_should_stop())
+				break;
+		}
+
+		ret = pm_runtime_resume_and_get(dpmaif_ctrl->dev);
+		if (ret < 0 && ret != -EACCES)
+			return ret;
+
+		t7xx_pci_disable_sleep(dpmaif_ctrl->t7xx_dev);
+		t7xx_do_tx_hw_push(dpmaif_ctrl);
+		t7xx_pci_enable_sleep(dpmaif_ctrl->t7xx_dev);
+		pm_runtime_mark_last_busy(dpmaif_ctrl->dev);
+		pm_runtime_put_autosuspend(dpmaif_ctrl->dev);
+	}
+
+	return 0;
+}
+
+int t7xx_dpmaif_tx_thread_init(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+	init_waitqueue_head(&dpmaif_ctrl->tx_wq);
+	dpmaif_ctrl->tx_thread = kthread_run(t7xx_dpmaif_tx_hw_push_thread,
+					     dpmaif_ctrl, "dpmaif_tx_hw_push");
+	return PTR_ERR_OR_ZERO(dpmaif_ctrl->tx_thread);
+}
+
+void t7xx_dpmaif_tx_thread_rel(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+	if (dpmaif_ctrl->tx_thread)
+		kthread_stop(dpmaif_ctrl->tx_thread);
+}
+
+/**
+ * t7xx_dpmaif_tx_send_skb() - Add skb to the transmit queue.
+ * @dpmaif_ctrl: Pointer to struct dpmaif_ctrl.
+ * @txq_number: Queue number to xmit on.
+ * @skb: Pointer to the skb to transmit.
+ *
+ * Add the skb to the queue of the skbs to be transmit.
+ * Wake up the thread that push the skbs from the queue to the HW.
+ *
+ * Return:
+ * * 0		- Success.
+ * * -EBUSY	- Tx budget exhausted.
+ *		  In normal circumstances t7xx_dpmaif_add_skb_to_ring() must report the txq full
+ *		  state to prevent this error condition.
+ */
+int t7xx_dpmaif_tx_send_skb(struct dpmaif_ctrl *dpmaif_ctrl, unsigned int txq_number,
+			    struct sk_buff *skb)
+{
+	struct dpmaif_tx_queue *txq = &dpmaif_ctrl->txq[txq_number];
+	struct dpmaif_callbacks *cb = dpmaif_ctrl->callbacks;
+	struct t7xx_skb_cb *skb_cb;
+
+	if (atomic_read(&txq->tx_budget) <= t7xx_skb_drb_cnt(skb)) {
+		cb->state_notify(dpmaif_ctrl->t7xx_dev, DMPAIF_TXQ_STATE_FULL, txq_number);
+		return -EBUSY;
+	}
+
+	skb_cb = T7XX_SKB_CB(skb);
+	skb_cb->txq_number = txq_number;
+	skb_queue_tail(&txq->tx_skb_head, skb);
+	wake_up(&dpmaif_ctrl->tx_wq);
+
+	return 0;
+}
+
+void t7xx_dpmaif_irq_tx_done(struct dpmaif_ctrl *dpmaif_ctrl, unsigned int que_mask)
+{
+	int i;
+
+	for (i = 0; i < DPMAIF_TXQ_NUM; i++) {
+		if (que_mask & BIT(i))
+			queue_work(dpmaif_ctrl->txq[i].worker, &dpmaif_ctrl->txq[i].dpmaif_tx_work);
+	}
+}
+
+static int t7xx_dpmaif_tx_drb_buf_init(struct dpmaif_tx_queue *txq)
+{
+	size_t brb_skb_size, brb_pd_size;
+
+	brb_pd_size = DPMAIF_DRB_LIST_LEN * sizeof(struct dpmaif_drb);
+	brb_skb_size = DPMAIF_DRB_LIST_LEN * sizeof(struct dpmaif_drb_skb);
+
+	txq->drb_size_cnt = DPMAIF_DRB_LIST_LEN;
+
+	/* For HW && AP SW */
+	txq->drb_base = dma_alloc_coherent(txq->dpmaif_ctrl->dev, brb_pd_size,
+					   &txq->drb_bus_addr, GFP_KERNEL | __GFP_ZERO);
+	if (!txq->drb_base)
+		return -ENOMEM;
+
+	/* For AP SW to record the skb information */
+	txq->drb_skb_base = devm_kzalloc(txq->dpmaif_ctrl->dev, brb_skb_size, GFP_KERNEL);
+	if (!txq->drb_skb_base) {
+		dma_free_coherent(txq->dpmaif_ctrl->dev, brb_pd_size,
+				  txq->drb_base, txq->drb_bus_addr);
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+static void t7xx_dpmaif_tx_free_drb_skb(struct dpmaif_tx_queue *txq)
+{
+	struct dpmaif_drb_skb *drb_skb, *drb_skb_base = txq->drb_skb_base;
+	unsigned int i;
+
+	if (!drb_skb_base)
+		return;
+
+	for (i = 0; i < txq->drb_size_cnt; i++) {
+		drb_skb = drb_skb_base + i;
+		if (!drb_skb->skb)
+			continue;
+
+		if (!drb_skb->is_msg)
+			dma_unmap_single(txq->dpmaif_ctrl->dev, drb_skb->bus_addr,
+					 drb_skb->data_len, DMA_TO_DEVICE);
+
+		if (drb_skb->is_last) {
+			dev_kfree_skb(drb_skb->skb);
+			drb_skb->skb = NULL;
+		}
+	}
+}
+
+static void t7xx_dpmaif_tx_drb_buf_rel(struct dpmaif_tx_queue *txq)
+{
+	if (txq->drb_base)
+		dma_free_coherent(txq->dpmaif_ctrl->dev,
+				  txq->drb_size_cnt * sizeof(struct dpmaif_drb),
+				  txq->drb_base, txq->drb_bus_addr);
+
+	t7xx_dpmaif_tx_free_drb_skb(txq);
+}
+
+/**
+ * t7xx_dpmaif_txq_init() - Initialize TX queue.
+ * @txq: Pointer to struct dpmaif_tx_queue.
+ *
+ * Initialize the TX queue data structure and allocate memory for it to use.
+ *
+ * Return:
+ * * 0		- Success.
+ * * -ERROR	- Error code from failure sub-initializations.
+ */
+int t7xx_dpmaif_txq_init(struct dpmaif_tx_queue *txq)
+{
+	int ret;
+
+	skb_queue_head_init(&txq->tx_skb_head);
+	init_waitqueue_head(&txq->req_wq);
+	atomic_set(&txq->tx_budget, DPMAIF_DRB_LIST_LEN);
+
+	ret = t7xx_dpmaif_tx_drb_buf_init(txq);
+	if (ret) {
+		dev_err(txq->dpmaif_ctrl->dev, "Failed to initialize DRB buffers: %d\n", ret);
+		return ret;
+	}
+
+	txq->worker = alloc_workqueue("md_dpmaif_tx%d_worker", WQ_UNBOUND | WQ_MEM_RECLAIM |
+				      (txq->index ? 0 : WQ_HIGHPRI), 1, txq->index);
+	if (!txq->worker)
+		return -ENOMEM;
+
+	INIT_WORK(&txq->dpmaif_tx_work, t7xx_dpmaif_tx_done);
+	spin_lock_init(&txq->tx_lock);
+
+	return 0;
+}
+
+void t7xx_dpmaif_txq_free(struct dpmaif_tx_queue *txq)
+{
+	if (txq->worker)
+		destroy_workqueue(txq->worker);
+
+	skb_queue_purge(&txq->tx_skb_head);
+	t7xx_dpmaif_tx_drb_buf_rel(txq);
+}
+
+void t7xx_dpmaif_tx_stop(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+	int i;
+
+	for (i = 0; i < DPMAIF_TXQ_NUM; i++) {
+		struct dpmaif_tx_queue *txq;
+		int count = 0;
+
+		txq = &dpmaif_ctrl->txq[i];
+		txq->que_started = false;
+		/* Make sure TXQ is disabled */
+		smp_mb();
+
+		/* Wait for active Tx to be done */
+		while (atomic_read(&txq->tx_processing)) {
+			if (++count >= DPMAIF_MAX_CHECK_COUNT) {
+				dev_err(dpmaif_ctrl->dev, "TX queue stop failed\n");
+				break;
+			}
+		}
+	}
+}
+
+static void t7xx_dpmaif_txq_flush_rel(struct dpmaif_tx_queue *txq)
+{
+	txq->que_started = false;
+
+	cancel_work_sync(&txq->dpmaif_tx_work);
+	flush_work(&txq->dpmaif_tx_work);
+	t7xx_dpmaif_tx_free_drb_skb(txq);
+
+	txq->drb_rd_idx = 0;
+	txq->drb_wr_idx = 0;
+	txq->drb_release_rd_idx = 0;
+}
+
+void t7xx_dpmaif_tx_clear(struct dpmaif_ctrl *dpmaif_ctrl)
+{
+	int i;
+
+	for (i = 0; i < DPMAIF_TXQ_NUM; i++)
+		t7xx_dpmaif_txq_flush_rel(&dpmaif_ctrl->txq[i]);
+}