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, 506 insertions, 0 deletions

diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_rx.c b/drivers/net/ethernet/marvell/octeon_ep/octep_rx.c
new file mode 100644
index 000000000..392d9b0da
--- /dev/null
+++ b/drivers/net/ethernet/marvell/octeon_ep/octep_rx.c
@@ -0,0 +1,506 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Marvell Octeon EP (EndPoint) Ethernet Driver
+ *
+ * Copyright (C) 2020 Marvell.
+ *
+ */
+
+#include <linux/pci.h>
+#include <linux/etherdevice.h>
+#include <linux/vmalloc.h>
+
+#include "octep_config.h"
+#include "octep_main.h"
+
+static void octep_oq_reset_indices(struct octep_oq *oq)
+{
+	oq->host_read_idx = 0;
+	oq->host_refill_idx = 0;
+	oq->refill_count = 0;
+	oq->last_pkt_count = 0;
+	oq->pkts_pending = 0;
+}
+
+/**
+ * octep_oq_fill_ring_buffers() - fill initial receive buffers for Rx ring.
+ *
+ * @oq: Octeon Rx queue data structure.
+ *
+ * Return: 0, if successfully filled receive buffers for all descriptors.
+ *         -1, if failed to allocate a buffer or failed to map for DMA.
+ */
+static int octep_oq_fill_ring_buffers(struct octep_oq *oq)
+{
+	struct octep_oq_desc_hw *desc_ring = oq->desc_ring;
+	struct page *page;
+	u32 i;
+
+	for (i = 0; i < oq->max_count; i++) {
+		page = dev_alloc_page();
+		if (unlikely(!page)) {
+			dev_err(oq->dev, "Rx buffer alloc failed\n");
+			goto rx_buf_alloc_err;
+		}
+		desc_ring[i].buffer_ptr = dma_map_page(oq->dev, page, 0,
+						       PAGE_SIZE,
+						       DMA_FROM_DEVICE);
+		if (dma_mapping_error(oq->dev, desc_ring[i].buffer_ptr)) {
+			dev_err(oq->dev,
+				"OQ-%d buffer alloc: DMA mapping error!\n",
+				oq->q_no);
+			put_page(page);
+			goto dma_map_err;
+		}
+		oq->buff_info[i].page = page;
+	}
+
+	return 0;
+
+dma_map_err:
+rx_buf_alloc_err:
+	while (i) {
+		i--;
+		dma_unmap_page(oq->dev, desc_ring[i].buffer_ptr, PAGE_SIZE, DMA_FROM_DEVICE);
+		put_page(oq->buff_info[i].page);
+		oq->buff_info[i].page = NULL;
+	}
+
+	return -1;
+}
+
+/**
+ * octep_oq_refill() - refill buffers for used Rx ring descriptors.
+ *
+ * @oct: Octeon device private data structure.
+ * @oq: Octeon Rx queue data structure.
+ *
+ * Return: number of descriptors successfully refilled with receive buffers.
+ */
+static int octep_oq_refill(struct octep_device *oct, struct octep_oq *oq)
+{
+	struct octep_oq_desc_hw *desc_ring = oq->desc_ring;
+	struct page *page;
+	u32 refill_idx, i;
+
+	refill_idx = oq->host_refill_idx;
+	for (i = 0; i < oq->refill_count; i++) {
+		page = dev_alloc_page();
+		if (unlikely(!page)) {
+			dev_err(oq->dev, "refill: rx buffer alloc failed\n");
+			oq->stats.alloc_failures++;
+			break;
+		}
+
+		desc_ring[refill_idx].buffer_ptr = dma_map_page(oq->dev, page, 0,
+								PAGE_SIZE, DMA_FROM_DEVICE);
+		if (dma_mapping_error(oq->dev, desc_ring[refill_idx].buffer_ptr)) {
+			dev_err(oq->dev,
+				"OQ-%d buffer refill: DMA mapping error!\n",
+				oq->q_no);
+			put_page(page);
+			oq->stats.alloc_failures++;
+			break;
+		}
+		oq->buff_info[refill_idx].page = page;
+		refill_idx++;
+		if (refill_idx == oq->max_count)
+			refill_idx = 0;
+	}
+	oq->host_refill_idx = refill_idx;
+	oq->refill_count -= i;
+
+	return i;
+}
+
+/**
+ * octep_setup_oq() - Setup a Rx queue.
+ *
+ * @oct: Octeon device private data structure.
+ * @q_no: Rx queue number to be setup.
+ *
+ * Allocate resources for a Rx queue.
+ */
+static int octep_setup_oq(struct octep_device *oct, int q_no)
+{
+	struct octep_oq *oq;
+	u32 desc_ring_size;
+
+	oq = vzalloc(sizeof(*oq));
+	if (!oq)
+		goto create_oq_fail;
+	oct->oq[q_no] = oq;
+
+	oq->octep_dev = oct;
+	oq->netdev = oct->netdev;
+	oq->dev = &oct->pdev->dev;
+	oq->q_no = q_no;
+	oq->max_count = CFG_GET_OQ_NUM_DESC(oct->conf);
+	oq->ring_size_mask = oq->max_count - 1;
+	oq->buffer_size = CFG_GET_OQ_BUF_SIZE(oct->conf);
+	oq->max_single_buffer_size = oq->buffer_size - OCTEP_OQ_RESP_HW_SIZE;
+
+	/* When the hardware/firmware supports additional capabilities,
+	 * additional header is filled-in by Octeon after length field in
+	 * Rx packets. this header contains additional packet information.
+	 */
+	if (oct->caps_enabled)
+		oq->max_single_buffer_size -= OCTEP_OQ_RESP_HW_EXT_SIZE;
+
+	oq->refill_threshold = CFG_GET_OQ_REFILL_THRESHOLD(oct->conf);
+
+	desc_ring_size = oq->max_count * OCTEP_OQ_DESC_SIZE;
+	oq->desc_ring = dma_alloc_coherent(oq->dev, desc_ring_size,
+					   &oq->desc_ring_dma, GFP_KERNEL);
+
+	if (unlikely(!oq->desc_ring)) {
+		dev_err(oq->dev,
+			"Failed to allocate DMA memory for OQ-%d !!\n", q_no);
+		goto desc_dma_alloc_err;
+	}
+
+	oq->buff_info = vzalloc(oq->max_count * OCTEP_OQ_RECVBUF_SIZE);
+	if (unlikely(!oq->buff_info)) {
+		dev_err(&oct->pdev->dev,
+			"Failed to allocate buffer info for OQ-%d\n", q_no);
+		goto buf_list_err;
+	}
+
+	if (octep_oq_fill_ring_buffers(oq))
+		goto oq_fill_buff_err;
+
+	octep_oq_reset_indices(oq);
+	oct->hw_ops.setup_oq_regs(oct, q_no);
+	oct->num_oqs++;
+
+	return 0;
+
+oq_fill_buff_err:
+	vfree(oq->buff_info);
+	oq->buff_info = NULL;
+buf_list_err:
+	dma_free_coherent(oq->dev, desc_ring_size,
+			  oq->desc_ring, oq->desc_ring_dma);
+	oq->desc_ring = NULL;
+desc_dma_alloc_err:
+	vfree(oq);
+	oct->oq[q_no] = NULL;
+create_oq_fail:
+	return -1;
+}
+
+/**
+ * octep_oq_free_ring_buffers() - Free ring buffers.
+ *
+ * @oq: Octeon Rx queue data structure.
+ *
+ * Free receive buffers in unused Rx queue descriptors.
+ */
+static void octep_oq_free_ring_buffers(struct octep_oq *oq)
+{
+	struct octep_oq_desc_hw *desc_ring = oq->desc_ring;
+	int  i;
+
+	if (!oq->desc_ring || !oq->buff_info)
+		return;
+
+	for (i = 0; i < oq->max_count; i++)  {
+		if (oq->buff_info[i].page) {
+			dma_unmap_page(oq->dev, desc_ring[i].buffer_ptr,
+				       PAGE_SIZE, DMA_FROM_DEVICE);
+			put_page(oq->buff_info[i].page);
+			oq->buff_info[i].page = NULL;
+			desc_ring[i].buffer_ptr = 0;
+		}
+	}
+	octep_oq_reset_indices(oq);
+}
+
+/**
+ * octep_free_oq() - Free Rx queue resources.
+ *
+ * @oq: Octeon Rx queue data structure.
+ *
+ * Free all resources of a Rx queue.
+ */
+static int octep_free_oq(struct octep_oq *oq)
+{
+	struct octep_device *oct = oq->octep_dev;
+	int q_no = oq->q_no;
+
+	octep_oq_free_ring_buffers(oq);
+
+	vfree(oq->buff_info);
+
+	if (oq->desc_ring)
+		dma_free_coherent(oq->dev,
+				  oq->max_count * OCTEP_OQ_DESC_SIZE,
+				  oq->desc_ring, oq->desc_ring_dma);
+
+	vfree(oq);
+	oct->oq[q_no] = NULL;
+	oct->num_oqs--;
+	return 0;
+}
+
+/**
+ * octep_setup_oqs() - setup resources for all Rx queues.
+ *
+ * @oct: Octeon device private data structure.
+ */
+int octep_setup_oqs(struct octep_device *oct)
+{
+	int i, retval = 0;
+
+	oct->num_oqs = 0;
+	for (i = 0; i < CFG_GET_PORTS_ACTIVE_IO_RINGS(oct->conf); i++) {
+		retval = octep_setup_oq(oct, i);
+		if (retval) {
+			dev_err(&oct->pdev->dev,
+				"Failed to setup OQ(RxQ)-%d.\n", i);
+			goto oq_setup_err;
+		}
+		dev_dbg(&oct->pdev->dev, "Successfully setup OQ(RxQ)-%d.\n", i);
+	}
+
+	return 0;
+
+oq_setup_err:
+	while (i) {
+		i--;
+		octep_free_oq(oct->oq[i]);
+	}
+	return -1;
+}
+
+/**
+ * octep_oq_dbell_init() - Initialize Rx queue doorbell.
+ *
+ * @oct: Octeon device private data structure.
+ *
+ * Write number of descriptors to Rx queue doorbell register.
+ */
+void octep_oq_dbell_init(struct octep_device *oct)
+{
+	int i;
+
+	for (i = 0; i < oct->num_oqs; i++)
+		writel(oct->oq[i]->max_count, oct->oq[i]->pkts_credit_reg);
+}
+
+/**
+ * octep_free_oqs() - Free resources of all Rx queues.
+ *
+ * @oct: Octeon device private data structure.
+ */
+void octep_free_oqs(struct octep_device *oct)
+{
+	int i;
+
+	for (i = 0; i < CFG_GET_PORTS_ACTIVE_IO_RINGS(oct->conf); i++) {
+		if (!oct->oq[i])
+			continue;
+		octep_free_oq(oct->oq[i]);
+		dev_dbg(&oct->pdev->dev,
+			"Successfully freed OQ(RxQ)-%d.\n", i);
+	}
+}
+
+/**
+ * octep_oq_check_hw_for_pkts() - Check for new Rx packets.
+ *
+ * @oct: Octeon device private data structure.
+ * @oq: Octeon Rx queue data structure.
+ *
+ * Return: packets received after previous check.
+ */
+static int octep_oq_check_hw_for_pkts(struct octep_device *oct,
+				      struct octep_oq *oq)
+{
+	u32 pkt_count, new_pkts;
+
+	pkt_count = readl(oq->pkts_sent_reg);
+	new_pkts = pkt_count - oq->last_pkt_count;
+
+	/* Clear the hardware packets counter register if the rx queue is
+	 * being processed continuously with-in a single interrupt and
+	 * reached half its max value.
+	 * this counter is not cleared every time read, to save write cycles.
+	 */
+	if (unlikely(pkt_count > 0xF0000000U)) {
+		writel(pkt_count, oq->pkts_sent_reg);
+		pkt_count = readl(oq->pkts_sent_reg);
+		new_pkts += pkt_count;
+	}
+	oq->last_pkt_count = pkt_count;
+	oq->pkts_pending += new_pkts;
+	return new_pkts;
+}
+
+/**
+ * __octep_oq_process_rx() - Process hardware Rx queue and push to stack.
+ *
+ * @oct: Octeon device private data structure.
+ * @oq: Octeon Rx queue data structure.
+ * @pkts_to_process: number of packets to be processed.
+ *
+ * Process the new packets in Rx queue.
+ * Packets larger than single Rx buffer arrive in consecutive descriptors.
+ * But, count returned by the API only accounts full packets, not fragments.
+ *
+ * Return: number of packets processed and pushed to stack.
+ */
+static int __octep_oq_process_rx(struct octep_device *oct,
+				 struct octep_oq *oq, u16 pkts_to_process)
+{
+	struct octep_oq_resp_hw_ext *resp_hw_ext = NULL;
+	struct octep_rx_buffer *buff_info;
+	struct octep_oq_resp_hw *resp_hw;
+	u32 pkt, rx_bytes, desc_used;
+	struct sk_buff *skb;
+	u16 data_offset;
+	u32 read_idx;
+
+	read_idx = oq->host_read_idx;
+	rx_bytes = 0;
+	desc_used = 0;
+	for (pkt = 0; pkt < pkts_to_process; pkt++) {
+		buff_info = (struct octep_rx_buffer *)&oq->buff_info[read_idx];
+		dma_unmap_page(oq->dev, oq->desc_ring[read_idx].buffer_ptr,
+			       PAGE_SIZE, DMA_FROM_DEVICE);
+		resp_hw = page_address(buff_info->page);
+		buff_info->page = NULL;
+
+		/* Swap the length field that is in Big-Endian to CPU */
+		buff_info->len = be64_to_cpu(resp_hw->length);
+		if (oct->caps_enabled & OCTEP_CAP_RX_CHECKSUM) {
+			/* Extended response header is immediately after
+			 * response header (resp_hw)
+			 */
+			resp_hw_ext = (struct octep_oq_resp_hw_ext *)
+				      (resp_hw + 1);
+			buff_info->len -= OCTEP_OQ_RESP_HW_EXT_SIZE;
+			/* Packet Data is immediately after
+			 * extended response header.
+			 */
+			data_offset = OCTEP_OQ_RESP_HW_SIZE +
+				      OCTEP_OQ_RESP_HW_EXT_SIZE;
+		} else {
+			/* Data is immediately after
+			 * Hardware Rx response header.
+			 */
+			data_offset = OCTEP_OQ_RESP_HW_SIZE;
+		}
+		rx_bytes += buff_info->len;
+
+		if (buff_info->len <= oq->max_single_buffer_size) {
+			skb = build_skb((void *)resp_hw, PAGE_SIZE);
+			skb_reserve(skb, data_offset);
+			skb_put(skb, buff_info->len);
+			read_idx++;
+			desc_used++;
+			if (read_idx == oq->max_count)
+				read_idx = 0;
+		} else {
+			struct skb_shared_info *shinfo;
+			u16 data_len;
+
+			skb = build_skb((void *)resp_hw, PAGE_SIZE);
+			skb_reserve(skb, data_offset);
+			/* Head fragment includes response header(s);
+			 * subsequent fragments contains only data.
+			 */
+			skb_put(skb, oq->max_single_buffer_size);
+			read_idx++;
+			desc_used++;
+			if (read_idx == oq->max_count)
+				read_idx = 0;
+
+			shinfo = skb_shinfo(skb);
+			data_len = buff_info->len - oq->max_single_buffer_size;
+			while (data_len) {
+				dma_unmap_page(oq->dev, oq->desc_ring[read_idx].buffer_ptr,
+					       PAGE_SIZE, DMA_FROM_DEVICE);
+				buff_info = (struct octep_rx_buffer *)
+					    &oq->buff_info[read_idx];
+				if (data_len < oq->buffer_size) {
+					buff_info->len = data_len;
+					data_len = 0;
+				} else {
+					buff_info->len = oq->buffer_size;
+					data_len -= oq->buffer_size;
+				}
+
+				skb_add_rx_frag(skb, shinfo->nr_frags,
+						buff_info->page, 0,
+						buff_info->len,
+						buff_info->len);
+				buff_info->page = NULL;
+				read_idx++;
+				desc_used++;
+				if (read_idx == oq->max_count)
+					read_idx = 0;
+			}
+		}
+
+		skb->dev = oq->netdev;
+		skb->protocol =  eth_type_trans(skb, skb->dev);
+		if (resp_hw_ext &&
+		    resp_hw_ext->csum_verified == OCTEP_CSUM_VERIFIED)
+			skb->ip_summed = CHECKSUM_UNNECESSARY;
+		else
+			skb->ip_summed = CHECKSUM_NONE;
+		napi_gro_receive(oq->napi, skb);
+	}
+
+	oq->host_read_idx = read_idx;
+	oq->refill_count += desc_used;
+	oq->stats.packets += pkt;
+	oq->stats.bytes += rx_bytes;
+
+	return pkt;
+}
+
+/**
+ * octep_oq_process_rx() - Process Rx queue.
+ *
+ * @oq: Octeon Rx queue data structure.
+ * @budget: max number of packets can be processed in one invocation.
+ *
+ * Check for newly received packets and process them.
+ * Keeps checking for new packets until budget is used or no new packets seen.
+ *
+ * Return: number of packets processed.
+ */
+int octep_oq_process_rx(struct octep_oq *oq, int budget)
+{
+	u32 pkts_available, pkts_processed, total_pkts_processed;
+	struct octep_device *oct = oq->octep_dev;
+
+	pkts_available = 0;
+	pkts_processed = 0;
+	total_pkts_processed = 0;
+	while (total_pkts_processed < budget) {
+		 /* update pending count only when current one exhausted */
+		if (oq->pkts_pending == 0)
+			octep_oq_check_hw_for_pkts(oct, oq);
+		pkts_available = min(budget - total_pkts_processed,
+				     oq->pkts_pending);
+		if (!pkts_available)
+			break;
+
+		pkts_processed = __octep_oq_process_rx(oct, oq,
+						       pkts_available);
+		oq->pkts_pending -= pkts_processed;
+		total_pkts_processed += pkts_processed;
+	}
+
+	if (oq->refill_count >= oq->refill_threshold) {
+		u32 desc_refilled = octep_oq_refill(oct, oq);
+
+		/* flush pending writes before updating credits */
+		wmb();
+		writel(desc_refilled, oq->pkts_credit_reg);
+	}
+
+	return total_pkts_processed;
+}