Re: [PATCH RFC 02/11] dpaa_eth: add support for DPAA Ethernet

From: Kumar Gala
Date: Wed Mar 18 2015 - 12:30:43 EST

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On Mar 17, 2015, at 1:58 PM, Madalin Bucur <madalin.bucur@xxxxxxxxxxxxx> wrote:

> This introduces the Freescale Data Path Acceleration Architecture
> (DPAA) Ethernet driver (dpaa_eth) that builds upon the DPAA QMan,
> BMan, PAMU and FMan drivers to deliver Ethernet connectivity on
> the Freescale DPAA QorIQ platforms.
>
> Signed-off-by: Madalin Bucur <madalin.bucur@xxxxxxxxxxxxx>
> ---
> drivers/net/ethernet/freescale/Kconfig | 2 +
> drivers/net/ethernet/freescale/Makefile | 1 +
> drivers/net/ethernet/freescale/dpaa/Kconfig | 49 +
> drivers/net/ethernet/freescale/dpaa/Makefile | 14 +
> drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 837 +++++++++++++
> drivers/net/ethernet/freescale/dpaa/dpaa_eth.h | 446 +++++++
> .../net/ethernet/freescale/dpaa/dpaa_eth_common.c | 1288 ++++++++++++++++++++
> .../net/ethernet/freescale/dpaa/dpaa_eth_common.h | 119 ++
> drivers/net/ethernet/freescale/dpaa/dpaa_eth_sg.c | 428 +++++++
> 9 files changed, 3184 insertions(+)
> create mode 100644 drivers/net/ethernet/freescale/dpaa/Kconfig
> create mode 100644 drivers/net/ethernet/freescale/dpaa/Makefile
> create mode 100644 drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> create mode 100644 drivers/net/ethernet/freescale/dpaa/dpaa_eth.h
> create mode 100644 drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.c
> create mode 100644 drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.h
> create mode 100644 drivers/net/ethernet/freescale/dpaa/dpaa_eth_sg.c
>
> diff --git a/drivers/net/ethernet/freescale/Kconfig b/drivers/net/ethernet/freescale/Kconfig
> index ba84c4a..dd485f1 100644
> --- a/drivers/net/ethernet/freescale/Kconfig
> +++ b/drivers/net/ethernet/freescale/Kconfig
> @@ -95,4 +95,6 @@ config GIANFAR
> This driver supports the Gigabit TSEC on the MPC83xx, MPC85xx,
> and MPC86xx family of chips, and the FEC on the 8540.
>
> +source "drivers/net/ethernet/freescale/dpaa/Kconfig"
> +
> endif # NET_VENDOR_FREESCALE
> diff --git a/drivers/net/ethernet/freescale/Makefile b/drivers/net/ethernet/freescale/Makefile
> index 71debd1..b6c10ab 100644
> --- a/drivers/net/ethernet/freescale/Makefile
> +++ b/drivers/net/ethernet/freescale/Makefile
> @@ -12,6 +12,7 @@ obj-$(CONFIG_FS_ENET) += fs_enet/
> obj-$(CONFIG_FSL_PQ_MDIO) += fsl_pq_mdio.o
> obj-$(CONFIG_FSL_XGMAC_MDIO) += xgmac_mdio.o
> obj-$(CONFIG_GIANFAR) += gianfar_driver.o
> +obj-$(if $(CONFIG_FSL_DPAA_ETH),y) += dpaa/

Why isn’t

obj-$(CONFIG_FSL_DPAA_ETH) += dpaa/

enough?

> obj-$(CONFIG_PTP_1588_CLOCK_GIANFAR) += gianfar_ptp.o
> gianfar_driver-objs := gianfar.o \
> gianfar_ethtool.o
> diff --git a/drivers/net/ethernet/freescale/dpaa/Kconfig b/drivers/net/ethernet/freescale/dpaa/Kconfig
> new file mode 100644
> index 0000000..7ef703c
> --- /dev/null
> +++ b/drivers/net/ethernet/freescale/dpaa/Kconfig
> @@ -0,0 +1,49 @@
> +menuconfig FSL_DPAA_ETH
> + tristate "DPAA Ethernet"
> + depends on FSL_SOC && FSL_BMAN && FSL_QMAN && FSL_FMAN
> + select PHYLIB
> + select FSL_FMAN_MAC
> + ---help---
> + Data Path Acceleration Architecture Ethernet driver,
> + supporting the Freescale QorIQ chips.
> + Depends on Freescale Buffer Manager and Queue Manager
> + driver and Frame Manager Driver.
> +
> +if FSL_DPAA_ETH
> +
> +config FSL_DPAA_CS_THRESHOLD_1G
> + hex "Egress congestion threshold on 1G ports"
> + depends on FSL_DPAA_ETH
> + range 0x1000 0x10000000
> + default "0x06000000"
> + ---help---
> + The size in bytes of the egress Congestion State notification threshold on 1G ports.
> + The 1G dTSECs can quite easily be flooded by cores doing Tx in a tight loop
> + (e.g. by sending UDP datagrams at "while(1) speed"),
> + and the larger the frame size, the more acute the problem.
> + So we have to find a balance between these factors:
> + - avoiding the device staying congested for a prolonged time (risking
> + the netdev watchdog to fire - see also the tx_timeout module param);
> + - affecting performance of protocols such as TCP, which otherwise
> + behave well under the congestion notification mechanism;
> + - preventing the Tx cores from tightly-looping (as if the congestion
> + threshold was too low to be effective);
> + - running out of memory if the CS threshold is set too high.
> +
> +config FSL_DPAA_CS_THRESHOLD_10G
> + hex "Egress congestion threshold on 10G ports"
> + depends on FSL_DPAA_ETH
> + range 0x1000 0x20000000
> + default "0x10000000"
> + ---help ---
> + The size in bytes of the egress Congestion State notification threshold on 10G ports.
> +
> +config FSL_DPAA_INGRESS_CS_THRESHOLD
> + hex "Ingress congestion threshold on FMan ports"
> + depends on FSL_DPAA_ETH
> + default "0x10000000"
> + ---help---
> + The size in bytes of the ingress tail-drop threshold on FMan ports.
> + Traffic piling up above this value will be rejected by QMan and discarded by FMan.
> +

Do these thresholds really need to be kconfig options? Are they not changeable at runtime?

> +endif # FSL_DPAA_ETH
> diff --git a/drivers/net/ethernet/freescale/dpaa/Makefile b/drivers/net/ethernet/freescale/dpaa/Makefile
> new file mode 100644
> index 0000000..bdeb04e
> --- /dev/null
> +++ b/drivers/net/ethernet/freescale/dpaa/Makefile
> @@ -0,0 +1,14 @@
> +#
> +# Makefile for the Freescale DPAA Ethernet controllers
> +#
> +ccflags-y += -DVERSION=\”\"

Is this really needed, if so we need to fix that.

> +#
> +# Include FMan headers
> +FMAN = $(srctree)/drivers/soc/fsl/fman
> +ccflags-y += -I$(FMAN)
> +ccflags-y += -I$(FMAN)/inc
> +ccflags-y += -I$(FMAN)/flib
> +
> +obj-$(CONFIG_FSL_DPAA_ETH) += fsl_dpa.o
> +
> +fsl_dpa-objs += dpaa_eth.o dpaa_eth_sg.o dpaa_eth_common.o
> diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> new file mode 100644
> index 0000000..96a7cee
> --- /dev/null
> +++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> @@ -0,0 +1,837 @@
> +/* Copyright 2008 - 2015 Freescale Semiconductor Inc.
> + *
> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions are met:
> + * * Redistributions of source code must retain the above copyright
> + * notice, this list of conditions and the following disclaimer.
> + * * Redistributions in binary form must reproduce the above copyright
> + * notice, this list of conditions and the following disclaimer in the
> + * documentation and/or other materials provided with the distribution.
> + * * Neither the name of Freescale Semiconductor nor the
> + * names of its contributors may be used to endorse or promote products
> + * derived from this software without specific prior written permission.
> + *
> + * ALTERNATIVELY, this software may be distributed under the terms of the
> + * GNU General Public License ("GPL") as published by the Free Software
> + * Foundation, either version 2 of that License or (at your option) any
> + * later version.
> + *
> + * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
> + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
> + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
> + * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
> + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
> + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
> + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
> + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
> + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> + */
> +
> +#define pr_fmt(fmt) \
> + KBUILD_MODNAME ": " fmt
> +
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/of_mdio.h>
> +#include <linux/of_net.h>
> +#include <linux/kthread.h>
> +#include <linux/io.h>
> +#include <linux/if_arp.h> /* arp_hdr_len() */
> +#include <linux/if_vlan.h> /* VLAN_HLEN */
> +#include <linux/icmp.h> /* struct icmphdr */
> +#include <linux/ip.h> /* struct iphdr */
> +#include <linux/ipv6.h> /* struct ipv6hdr */
> +#include <linux/udp.h> /* struct udphdr */
> +#include <linux/tcp.h> /* struct tcphdr */
> +#include <linux/net.h> /* net_ratelimit() */
> +#include <linux/if_ether.h> /* ETH_P_IP and ETH_P_IPV6 */
> +#include <linux/highmem.h>
> +#include <linux/percpu.h>
> +#include <linux/dma-mapping.h>
> +#include <soc/fsl/bman.h>
> +
> +#include "fsl_fman.h"
> +#include "fm_ext.h"
> +#include "fm_port_ext.h"
> +
> +#include "mac.h"
> +#include "dpaa_eth.h"
> +#include "dpaa_eth_common.h"
> +
> +#define DPA_NAPI_WEIGHT 64
> +
> +/* Valid checksum indication */
> +#define DPA_CSUM_VALID 0xFFFF
> +
> +#define DPA_DESCRIPTION "FSL DPAA Ethernet driver"
> +
> +MODULE_LICENSE("Dual BSD/GPL");
> +
> +MODULE_AUTHOR("Andy Fleming <afleming@xxxxxxxxxxxxx>");
> +
> +MODULE_DESCRIPTION(DPA_DESCRIPTION);

These are typically at the end of the file, and kept together (ie no blank lines between them)

> +
> +static u8 debug = -1;
> +module_param(debug, byte, S_IRUGO);
> +MODULE_PARM_DESC(debug, "Module/Driver verbosity level");
> +
> +/* This has to work in tandem with the DPA_CS_THRESHOLD_xxx values. */
> +static u16 tx_timeout = 1000;
> +module_param(tx_timeout, ushort, S_IRUGO);
> +MODULE_PARM_DESC(tx_timeout, "The Tx timeout in ms");
> +
>

[snip]

> +
> +static struct platform_device_id dpa_devtype[] = {
> + {
> + .name = "dpaa-ethernet",
> + .driver_data = 0,
> + }, {
> + }
> +};
> +MODULE_DEVICE_TABLE(platform, dpa_devtype);
> +
> +static struct platform_driver dpa_driver = {
> + .driver = {
> + .name = KBUILD_MODNAME,
> + .owner = THIS_MODULE,
> + },
> + .id_table = dpa_devtype,
> + .probe = dpaa_eth_priv_probe,
> + .remove = dpa_remove
> +};
> +
> +static int __init __cold dpa_load(void)
> +{
> + int _errno;
> +
> + pr_info(DPA_DESCRIPTION " (" VERSION ")\n");
> +
> + /* initialise dpaa_eth mirror values */
> + dpa_rx_extra_headroom = fm_get_rx_extra_headroom();
> + dpa_max_frm = fm_get_max_frm();
> +
> + _errno = platform_driver_register(&dpa_driver);
> + if (unlikely(_errno < 0)) {
> + pr_err(KBUILD_MODNAME
> + ": %s:%hu:%s(): platform_driver_register() = %d\n",
> + KBUILD_BASENAME ".c", __LINE__, __func__, _errno);
> + }
> +
> + pr_debug(KBUILD_MODNAME ": %s:%s() ->\n",
> + KBUILD_BASENAME ".c", __func__);
> +
> + return _errno;
> +}
> +module_init(dpa_load);
> +
> +static void __exit __cold dpa_unload(void)
> +{
> + pr_debug(KBUILD_MODNAME ": -> %s:%s()\n",
> + KBUILD_BASENAME ".c", __func__);
> +
> + platform_driver_unregister(&dpa_driver);
> +
> + /* Only one channel is used and needs to be relased after all
> + * interfaces are removed
> + */
> + dpa_release_channel();
> +
> + pr_debug(KBUILD_MODNAME ": %s:%s() ->\n",
> + KBUILD_BASENAME ".c", __func__);
> +}
> +module_exit(dpa_unload);

What’s the point of this dpa platform driver?

> diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.h b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.h
> new file mode 100644
> index 0000000..793491f
> --- /dev/null
> +++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.h
> @@ -0,0 +1,446 @@
> +/* Copyright 2008 - 2015 Freescale Semiconductor Inc.
> + *
> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions are met:
> + * * Redistributions of source code must retain the above copyright
> + * notice, this list of conditions and the following disclaimer.
> + * * Redistributions in binary form must reproduce the above copyright
> + * notice, this list of conditions and the following disclaimer in the
> + * documentation and/or other materials provided with the distribution.
> + * * Neither the name of Freescale Semiconductor nor the
> + * names of its contributors may be used to endorse or promote products
> + * derived from this software without specific prior written permission.
> + *
> + * ALTERNATIVELY, this software may be distributed under the terms of the
> + * GNU General Public License ("GPL") as published by the Free Software
> + * Foundation, either version 2 of that License or (at your option) any
> + * later version.
> + *
> + * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
> + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
> + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
> + * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
> + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
> + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
> + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
> + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
> + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> + */
> +
> +#ifndef __DPA_H
> +#define __DPA_H
> +
> +#include <linux/netdevice.h>
> +#include <soc/fsl/qman.h> /* struct qman_fq */
> +
> +#include "fm_ext.h"
> +
> +extern int dpa_rx_extra_headroom;
> +extern int dpa_max_frm;
> +
> +#define dpa_get_rx_extra_headroom() dpa_rx_extra_headroom
> +#define dpa_get_max_frm() dpa_max_frm
> +
> +#define dpa_get_max_mtu() \
> + (dpa_get_max_frm() - (VLAN_ETH_HLEN + ETH_FCS_LEN))
> +
> +#define __hot
> +
> +/* Simple enum of FQ types - used for array indexing */
> +enum port_type {RX, TX};
> +
> +struct dpa_buffer_layout_s {
> + u16 priv_data_size;
> + bool parse_results;
> + bool time_stamp;
> + bool hash_results;
> + u16 data_align;
> +};
> +
> +#define DPA_ERR_ON(cond)
> +
> +#define DPA_TX_PRIV_DATA_SIZE 16
> +#define DPA_PARSE_RESULTS_SIZE sizeof(fm_prs_result)
> +#define DPA_TIME_STAMP_SIZE 8
> +#define DPA_HASH_RESULTS_SIZE 8
> +#define DPA_RX_PRIV_DATA_SIZE (DPA_TX_PRIV_DATA_SIZE + \
> + dpa_get_rx_extra_headroom())
> +
> +#define FM_FD_STAT_RX_ERRORS \
> + (FM_PORT_FRM_ERR_DMA | FM_PORT_FRM_ERR_PHYSICAL | \
> + FM_PORT_FRM_ERR_SIZE | FM_PORT_FRM_ERR_CLS_DISCARD | \
> + FM_PORT_FRM_ERR_EXTRACTION | FM_PORT_FRM_ERR_NO_SCHEME | \
> + FM_PORT_FRM_ERR_PRS_TIMEOUT | FM_PORT_FRM_ERR_PRS_ILL_INSTRUCT | \
> + FM_PORT_FRM_ERR_PRS_HDR_ERR)
> +
> +#define FM_FD_STAT_TX_ERRORS \
> + (FM_PORT_FRM_ERR_UNSUPPORTED_FORMAT | \
> + FM_PORT_FRM_ERR_LENGTH | FM_PORT_FRM_ERR_DMA)
> +
> +/* The raw buffer size must be cacheline aligned.
> + * Normally we use 2K buffers.
> + */
> +#define DPA_BP_RAW_SIZE 2048
> +
> +/* This is what FMan is ever allowed to use.
> + * FMan-DMA requires 16-byte alignment for Rx buffers, but SKB_DATA_ALIGN is
> + * even stronger (SMP_CACHE_BYTES-aligned), so we just get away with that,
> + * via SKB_WITH_OVERHEAD(). We can't rely on netdev_alloc_frag() giving us
> + * half-page-aligned buffers (can we?), so we reserve some more space
> + * for start-of-buffer alignment.
> + */
> +#define dpa_bp_size(buffer_layout) (SKB_WITH_OVERHEAD(DPA_BP_RAW_SIZE) - \
> + SMP_CACHE_BYTES)
> +/* We must ensure that skb_shinfo is always cacheline-aligned. */
> +#define DPA_SKB_SIZE(size) ((size) & ~(SMP_CACHE_BYTES - 1))
> +
> +/* Largest value that the FQD's OAL field can hold.
> + * This is DPAA-1.x specific.
> + */
> +#define FSL_QMAN_MAX_OAL 127
> +
> +/* Default alignment for start of data in an Rx FD */
> +#define DPA_FD_DATA_ALIGNMENT 16
> +
> +/* Values for the L3R field of the FM Parse Results
> + */
> +/* L3 Type field: First IP Present IPv4 */
> +#define FM_L3_PARSE_RESULT_IPV4 0x8000
> +/* L3 Type field: First IP Present IPv6 */
> +#define FM_L3_PARSE_RESULT_IPV6 0x4000
> +
> +/* Values for the L4R field of the FM Parse Results
> + * See $8.8.4.7.20 - L4 HXS - L4 Results from DPAA-Rev2 Reference Manual.
> + */
> +/* L4 Type field: UDP */
> +#define FM_L4_PARSE_RESULT_UDP 0x40
> +/* L4 Type field: TCP */
> +#define FM_L4_PARSE_RESULT_TCP 0x20
> +
> +#define FM_FD_STAT_ERR_PHYSICAL FM_PORT_FRM_ERR_PHYSICAL
> +
> +/* number of Tx queues to FMan */
> +#define DPAA_ETH_TX_QUEUES NR_CPUS
> +
> +#define DPAA_ETH_RX_QUEUES 128
> +
> +#define FSL_DPAA_ETH_MAX_BUF_COUNT 128
> +#define FSL_DPAA_ETH_REFILL_THRESHOLD 80
> +
> +/* More detailed FQ types - used for fine-grained WQ assignments */
> +enum dpa_fq_type {
> + FQ_TYPE_RX_DEFAULT = 1, /* Rx Default FQs */
> + FQ_TYPE_RX_ERROR, /* Rx Error FQs */
> + FQ_TYPE_RX_PCD, /* User-defined PCDs */
> + FQ_TYPE_TX, /* "Real" Tx FQs */
> + FQ_TYPE_TX_CONFIRM, /* Tx default Conf FQ (actually an Rx FQ) */
> + FQ_TYPE_TX_CONF_MQ, /* Tx conf FQs (one for each Tx FQ) */
> + FQ_TYPE_TX_ERROR, /* Tx Error FQs (these are actually Rx FQs) */
> +};
> +
> +struct dpa_fq {
> + struct qman_fq fq_base;
> + struct list_head list;
> + struct net_device *net_dev;
> + bool init;
> + u32 fqid;
> + u32 flags;
> + u16 channel;
> + u8 wq;
> + enum dpa_fq_type fq_type;
> +};
> +
> +struct dpa_fq_cbs_t {
> + struct qman_fq rx_defq;
> + struct qman_fq tx_defq;
> + struct qman_fq rx_errq;
> + struct qman_fq tx_errq;
> + struct qman_fq egress_ern;
> +};
> +
> +struct fqid_cell {
> + u32 start;
> + u32 count;
> +};
> +
> +struct dpa_bp {
> + struct bman_pool *pool;
> + u8 bpid;
> + struct device *dev;
> + union {
> + /* The buffer pools used for the private ports are initialized
> + * with target_count buffers for each CPU; at runtime the
> + * number of buffers per CPU is constantly brought back to this
> + * level
> + */
> + int target_count;
> + /* The configured value for the number of buffers in the pool,
> + * used for shared port buffer pools
> + */
> + int config_count;
> + };
> + size_t size;
> + bool seed_pool;
> + /* physical address of the contiguous memory used by the pool to store
> + * the buffers
> + */
> + dma_addr_t paddr;
> + /* virtual address of the contiguous memory used by the pool to store
> + * the buffers
> + */
> + void __iomem *vaddr;
> + /* current number of buffers in the bpool alloted to this CPU */
> + int __percpu *percpu_count;
> + atomic_t refs;
> + /* some bpools need to be seeded before use by this cb */
> + int (*seed_cb)(struct dpa_bp *);
> + /* some bpools need to be emptied before freeing; this cb is used
> + * for freeing of individual buffers taken from the pool
> + */
> + void (*free_buf_cb)(void *addr);
> +};
> +
> +struct dpa_napi_portal {
> + struct napi_struct napi;
> + struct qman_portal *p;
> +};
> +
> +struct dpa_percpu_priv_s {
> + struct net_device *net_dev;
> + struct dpa_napi_portal *np;
> + struct rtnl_link_stats64 stats;
> +};
> +
> +struct dpa_priv_s {
> + struct dpa_percpu_priv_s __percpu *percpu_priv;
> + struct dpa_bp *dpa_bp;
> + /* Store here the needed Tx headroom for convenience and speed
> + * (even though it can be computed based on the fields of buf_layout)
> + */
> + u16 tx_headroom;
> + struct net_device *net_dev;
> + struct mac_device *mac_dev;
> + struct qman_fq *egress_fqs[DPAA_ETH_TX_QUEUES];
> + struct qman_fq *conf_fqs[DPAA_ETH_TX_QUEUES];
> +
> + size_t bp_count;
> +
> + u16 channel; /* "fsl,qman-channel-id" */
> + struct list_head dpa_fq_list;
> +
> + u32 msg_enable; /* net_device message level */
> +
> + struct {
> + /**
> + * All egress queues to a given net device belong to one
> + * (and the same) congestion group.
> + */
> + struct qman_cgr cgr;
> + } cgr_data;
> + /* Use a per-port CGR for ingress traffic. */
> + bool use_ingress_cgr;
> + struct qman_cgr ingress_cgr;
> +
> + struct dpa_buffer_layout_s *buf_layout;
> + u16 rx_headroom;
> +};
> +
> +struct fm_port_fqs {
> + struct dpa_fq *tx_defq;
> + struct dpa_fq *tx_errq;
> + struct dpa_fq *rx_defq;
> + struct dpa_fq *rx_errq;
> +};
> +
> +int dpa_bp_priv_seed(struct dpa_bp *dpa_bp);
> +int dpaa_eth_refill_bpools(struct dpa_bp *dpa_bp, int *count_ptr);
> +void __hot _dpa_rx(struct net_device *net_dev,
> + struct qman_portal *portal,
> + const struct dpa_priv_s *priv,
> + struct dpa_percpu_priv_s *percpu_priv,
> + const struct qm_fd *fd,
> + u32 fqid,
> + int *count_ptr);
> +int __hot dpa_tx(struct sk_buff *skb, struct net_device *net_dev);
> +struct sk_buff *_dpa_cleanup_tx_fd(const struct dpa_priv_s *priv,
> + const struct qm_fd *fd);
> +
> +/* Turn on HW checksum computation for this outgoing frame.
> + * If the current protocol is not something we support in this regard
> + * (or if the stack has already computed the SW checksum), we do nothing.
> + *
> + * Returns 0 if all goes well (or HW csum doesn't apply), and a negative value
> + * otherwise.
> + *
> + * Note that this function may modify the fd->cmd field and the skb data buffer
> + * (the Parse Results area).
> + */
> +int dpa_enable_tx_csum(struct dpa_priv_s *priv, struct sk_buff *skb,
> + struct qm_fd *fd, char *parse_results);
> +
> +static inline int dpaa_eth_napi_schedule(struct dpa_percpu_priv_s *percpu_priv,
> + struct qman_portal *portal)
> +{
> + /* In case of threaded ISR for RT enable kernel,
> + * in_irq() does not return appropriate value, so use
> + * in_serving_softirq to distinguish softirq or irq context.
> + */
> + if (unlikely(in_irq() || !in_serving_softirq())) {
> + /* Disable QMan IRQ and invoke NAPI */
> + int ret = qman_p_irqsource_remove(portal, QM_PIRQ_DQRI);
> +
> + if (likely(!ret)) {
> + const struct qman_portal_config *pc =
> + qman_p_get_portal_config(portal);
> + struct dpa_napi_portal *np =
> + &percpu_priv->np[pc->channel];
> +
> + np->p = portal;
> + napi_schedule(&np->napi);
> + return 1;
> + }
> + }
> + return 0;
> +}
> +
> +static inline ssize_t __const __must_check __attribute__((nonnull))
> +dpa_fd_length(const struct qm_fd *fd)
> +{
> + return fd->length20;
> +}
> +
> +static inline ssize_t __const __must_check __attribute__((nonnull))
> +dpa_fd_offset(const struct qm_fd *fd)
> +{
> + return fd->offset;
> +}
> +
> +/* Verifies if the skb length is below the interface MTU */
> +static inline int dpa_check_rx_mtu(struct sk_buff *skb, int mtu)
> +{
> + if (unlikely(skb->len > mtu))
> + if ((skb->protocol != ETH_P_8021Q) || (skb->len > mtu + 4))
> + return -1;
> +
> + return 0;
> +}
> +
> +static inline u16 dpa_get_headroom(struct dpa_buffer_layout_s *bl)
> +{
> + u16 headroom;
> + /* The frame headroom must accommodate:
> + * - the driver private data area
> + * - parse results, hash results, timestamp if selected
> + * If either hash results or time stamp are selected, both will
> + * be copied to/from the frame headroom, as TS is located between PR and
> + * HR in the IC and IC copy size has a granularity of 16bytes
> + * (see description of FMBM_RICP and FMBM_TICP registers in DPAARM)
> + *
> + * Also make sure the headroom is a multiple of data_align bytes
> + */
> + headroom = (u16)(bl->priv_data_size +
> + (bl->parse_results ? DPA_PARSE_RESULTS_SIZE : 0) +
> + (bl->hash_results || bl->time_stamp ?
> + DPA_TIME_STAMP_SIZE + DPA_HASH_RESULTS_SIZE : 0));
> +
> + return bl->data_align ? ALIGN(headroom, bl->data_align) : headroom;
> +}
> +
> +
> +void dpa_private_napi_del(struct net_device *net_dev);
> +
> +static inline void clear_fd(struct qm_fd *fd)
> +{
> + fd->opaque_addr = 0;
> + fd->opaque = 0;
> + fd->cmd = 0;
> +}
> +
> +static inline struct qman_fq *_dpa_get_tx_conf_queue(
> + const struct dpa_priv_s *priv,
> + struct qman_fq *tx_fq)
> +{
> + int i;
> +
> + for (i = 0; i < DPAA_ETH_TX_QUEUES; i++)
> + if (priv->egress_fqs[i] == tx_fq)
> + return priv->conf_fqs[i];
> +
> + return NULL;
> +}
> +
> +static inline int __hot dpa_xmit(struct dpa_priv_s *priv,
> + struct rtnl_link_stats64 *percpu_stats,
> + int queue,
> + struct qm_fd *fd)

Is there a reason this isnt just in the .c file?

> +{
> + int err, i;
> + struct qman_fq *egress_fq;
> +
> + egress_fq = priv->egress_fqs[queue];
> + if (fd->bpid == 0xff)
> + fd->cmd |= qman_fq_fqid(
> + _dpa_get_tx_conf_queue(priv, egress_fq)
> + );
> +
> + for (i = 0; i < 100000; i++) {
> + err = qman_enqueue(egress_fq, fd, 0);
> + if (err != -EBUSY)
> + break;
> + }
> +
> + if (unlikely(err < 0)) {
> + percpu_stats->tx_errors++;
> + percpu_stats->tx_fifo_errors++;
> + return err;
> + }
> +
> + percpu_stats->tx_packets++;
> + percpu_stats->tx_bytes += dpa_fd_length(fd);
> +
> + return 0;
> +}
> +
> +/* Use multiple WQs for FQ assignment:
> + * - Tx Confirmation queues go to WQ1.
> + * - Rx Default and Tx queues go to WQ3 (no differentiation between
> + * Rx and Tx traffic).
> + * - Rx Error and Tx Error queues go to WQ2 (giving them a better chance
> + * to be scheduled, in case there are many more FQs in WQ3).
> + * This ensures that Tx-confirmed buffers are timely released. In particular,
> + * it avoids congestion on the Tx Confirm FQs, which can pile up PFDRs if they
> + * are greatly outnumbered by other FQs in the system, while
> + * dequeue scheduling is round-robin.
> + */
> +static inline void _dpa_assign_wq(struct dpa_fq *fq)
> +{
> + switch (fq->fq_type) {
> + case FQ_TYPE_TX_CONFIRM:
> + case FQ_TYPE_TX_CONF_MQ:
> + fq->wq = 1;
> + break;
> + case FQ_TYPE_RX_DEFAULT:
> + case FQ_TYPE_TX:
> + fq->wq = 3;
> + break;
> + case FQ_TYPE_RX_ERROR:
> + case FQ_TYPE_TX_ERROR:
> + fq->wq = 2;
> + break;
> + default:
> + WARN(1, "Invalid FQ type %d for FQID %d!\n",
> + fq->fq_type, fq->fqid);
> + }
> +}
> +
> +/* Use the queue selected by XPS */
> +#define dpa_get_queue_mapping(skb) \
> + skb_get_queue_mapping(skb)
> +
> +static inline void _dpa_bp_free_pf(void *addr)
> +{
> + put_page(virt_to_head_page(addr));
> +}
> +
> +#endif /* __DPA_H */
> diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.c
> new file mode 100644
> index 0000000..7094a45
> --- /dev/null
> +++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.c
> @@ -0,0 +1,1288 @@
> +/* Copyright 2008 - 2015 Freescale Semiconductor, Inc.
> + *
> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions are met:
> + * * Redistributions of source code must retain the above copyright
> + * notice, this list of conditions and the following disclaimer.
> + * * Redistributions in binary form must reproduce the above copyright
> + * notice, this list of conditions and the following disclaimer in the
> + * documentation and/or other materials provided with the distribution.
> + * * Neither the name of Freescale Semiconductor nor the
> + * names of its contributors may be used to endorse or promote products
> + * derived from this software without specific prior written permission.
> + *
> + * ALTERNATIVELY, this software may be distributed under the terms of the
> + * GNU General Public License ("GPL") as published by the Free Software
> + * Foundation, either version 2 of that License or (at your option) any
> + * later version.
> + *
> + * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
> + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
> + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
> + * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
> + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
> + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
> + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
> + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
> + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> + */
> +
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/of_platform.h>
> +#include <linux/of_net.h>
> +#include <linux/etherdevice.h>
> +#include <linux/kthread.h>
> +#include <linux/percpu.h>
> +#include <linux/highmem.h>
> +#include <linux/sort.h>
> +#include <soc/fsl/qman.h>
> +#include <linux/ip.h>
> +#include <linux/ipv6.h>
> +#include <linux/if_vlan.h> /* vlan_eth_hdr */
> +#include "dpaa_eth.h"
> +#include "dpaa_eth_common.h"
> +#include "mac.h"
> +
> +/* Size in bytes of the FQ taildrop threshold */
> +#define DPA_FQ_TD 0x200000
> +
> +static struct dpa_bp *dpa_bp_array[64];
> +
> +int dpa_max_frm;
> +EXPORT_SYMBOL(dpa_max_frm);
> +
> +int dpa_rx_extra_headroom;
> +EXPORT_SYMBOL(dpa_rx_extra_headroom);
> +
> +static const struct fqid_cell tx_confirm_fqids[] = {
> + {0, DPAA_ETH_TX_QUEUES}
> +};
> +
> +static const struct fqid_cell default_fqids[][3] = {
> + [RX] = { {0, 1}, {0, 1}, {0, DPAA_ETH_RX_QUEUES} },
> + [TX] = { {0, 1}, {0, 1}, {0, DPAA_ETH_TX_QUEUES} }
> +};
> +
> +int dpa_netdev_init(struct net_device *net_dev,
> + const u8 *mac_addr,
> + u16 tx_timeout)
> +{
> + int err;
> + struct dpa_priv_s *priv = netdev_priv(net_dev);
> + struct device *dev = net_dev->dev.parent;
> +
> + net_dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
> +
> + net_dev->features |= net_dev->hw_features;
> + net_dev->vlan_features = net_dev->features;
> +
> + memcpy(net_dev->perm_addr, mac_addr, net_dev->addr_len);
> + memcpy(net_dev->dev_addr, mac_addr, net_dev->addr_len);
> +
> + net_dev->needed_headroom = priv->tx_headroom;
> + net_dev->watchdog_timeo = msecs_to_jiffies(tx_timeout);
> +
> + err = register_netdev(net_dev);
> + if (err < 0) {
> + dev_err(dev, "register_netdev() = %d\n", err);
> + return err;
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(dpa_netdev_init);
> +
> +int __cold dpa_start(struct net_device *net_dev)
> +{
> + int err, i;
> + struct dpa_priv_s *priv;
> + struct mac_device *mac_dev;
> +
> + priv = netdev_priv(net_dev);
> + mac_dev = priv->mac_dev;
> +
> + err = mac_dev->init_phy(net_dev, priv->mac_dev);
> + if (err < 0) {
> + if (netif_msg_ifup(priv))
> + netdev_err(net_dev, "init_phy() = %d\n", err);
> + return err;
> + }
> +
> + for_each_port_device(i, mac_dev->port_dev) {
> + err = fm_port_enable(mac_dev->port_dev[i]);
> + if (err)
> + goto mac_start_failed;
> + }
> +
> + err = priv->mac_dev->start(mac_dev);
> + if (err < 0) {
> + if (netif_msg_ifup(priv))
> + netdev_err(net_dev, "mac_dev->start() = %d\n", err);
> + goto mac_start_failed;
> + }
> +
> + netif_tx_start_all_queues(net_dev);
> +
> + return 0;
> +
> +mac_start_failed:
> + for_each_port_device(i, mac_dev->port_dev)
> + fm_port_disable(mac_dev->port_dev[i]);
> +
> + return err;
> +}
> +EXPORT_SYMBOL(dpa_start);
> +
> +int __cold dpa_stop(struct net_device *net_dev)
> +{
> + int _errno, i, err;
> + struct dpa_priv_s *priv;
> + struct mac_device *mac_dev;
> +
> + priv = netdev_priv(net_dev);
> + mac_dev = priv->mac_dev;
> +
> + netif_tx_stop_all_queues(net_dev);
> + /* Allow the Fman (Tx) port to process in-flight frames before we
> + * try switching it off.
> + */
> + usleep_range(5000, 10000);
> +
> + _errno = mac_dev->stop(mac_dev);
> + if (unlikely(_errno < 0))
> + if (netif_msg_ifdown(priv))
> + netdev_err(net_dev, "mac_dev->stop() = %d\n",
> + _errno);
> +
> + for_each_port_device(i, mac_dev->port_dev) {
> + err = fm_port_disable(mac_dev->port_dev[i]);
> + _errno = err ? err : _errno;
> + }
> +
> + if (mac_dev->phy_dev)
> + phy_disconnect(mac_dev->phy_dev);
> + mac_dev->phy_dev = NULL;
> +
> + return _errno;
> +}
> +EXPORT_SYMBOL(dpa_stop);
> +
> +void __cold dpa_timeout(struct net_device *net_dev)
> +{
> + const struct dpa_priv_s *priv;
> + struct dpa_percpu_priv_s *percpu_priv;
> +
> + priv = netdev_priv(net_dev);
> + percpu_priv = raw_cpu_ptr(priv->percpu_priv);
> +
> + if (netif_msg_timer(priv))
> + netdev_crit(net_dev, "Transmit timeout latency: %u ms\n",
> + jiffies_to_msecs(jiffies - net_dev->trans_start));
> +
> + percpu_priv->stats.tx_errors++;
> +}
> +EXPORT_SYMBOL(dpa_timeout);
> +
> +/* net_device */
> +
> +/**
> + * @param net_dev the device for which statistics are calculated
> + * @param stats the function fills this structure with the device's statistics
> + * @return the address of the structure containing the statistics
> + *
> + * Calculates the statistics for the given device by adding the statistics
> + * collected by each CPU.
> + */
> +struct rtnl_link_stats64 * __cold
> +dpa_get_stats64(struct net_device *net_dev,
> + struct rtnl_link_stats64 *stats)
> +{
> + struct dpa_priv_s *priv = netdev_priv(net_dev);
> + u64 *cpustats;
> + u64 *netstats = (u64 *)stats;
> + int i, j;
> + struct dpa_percpu_priv_s *percpu_priv;
> + int numstats = sizeof(struct rtnl_link_stats64) / sizeof(u64);
> +
> + for_each_possible_cpu(i) {
> + percpu_priv = per_cpu_ptr(priv->percpu_priv, i);
> +
> + cpustats = (u64 *)&percpu_priv->stats;
> +
> + for (j = 0; j < numstats; j++)
> + netstats[j] += cpustats[j];
> + }
> +
> + return stats;
> +}
> +EXPORT_SYMBOL(dpa_get_stats64);
> +
> +int dpa_change_mtu(struct net_device *net_dev, int new_mtu)
> +{
> + const int max_mtu = dpa_get_max_mtu();
> +
> + /* Make sure we don't exceed the Ethernet controller's MAXFRM */
> + if (new_mtu < 68 || new_mtu > max_mtu) {
> + netdev_err(net_dev, "Invalid L3 mtu %d (must be between %d and %d).\n",
> + new_mtu, 68, max_mtu);
> + return -EINVAL;
> + }
> + net_dev->mtu = new_mtu;
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(dpa_change_mtu);
> +
> +/* .ndo_init callback */
> +int dpa_ndo_init(struct net_device *net_dev)
> +{
> + /* If fsl_fm_max_frm is set to a higher value than the all-common 1500,
> + * we choose conservatively and let the user explicitly set a higher
> + * MTU via ifconfig. Otherwise, the user may end up with different MTUs
> + * in the same LAN.
> + * If on the other hand fsl_fm_max_frm has been chosen below 1500,
> + * start with the maximum allowed.
> + */
> + int init_mtu = min(dpa_get_max_mtu(), ETH_DATA_LEN);
> +
> + pr_debug("Setting initial MTU on net device: %d\n", init_mtu);
> + net_dev->mtu = init_mtu;
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(dpa_ndo_init);
> +
> +int dpa_set_features(struct net_device *dev, netdev_features_t features)
> +{
> + /* Not much to do here for now */
> + dev->features = features;
> + return 0;
> +}
> +EXPORT_SYMBOL(dpa_set_features);
> +
> +netdev_features_t dpa_fix_features(struct net_device *dev,
> + netdev_features_t features)
> +{
> + netdev_features_t unsupported_features = 0;
> +
> + /* In theory we should never be requested to enable features that
> + * we didn't set in netdev->features and netdev->hw_features at probe
> + * time, but double check just to be on the safe side.
> + * We don't support enabling Rx csum through ethtool yet
> + */
> + unsupported_features |= NETIF_F_RXCSUM;
> +
> + features &= ~unsupported_features;
> +
> + return features;
> +}
> +EXPORT_SYMBOL(dpa_fix_features);
> +
> +int __cold dpa_remove(struct platform_device *pdev)
> +{
> + int err;
> + struct device *dev;
> + struct net_device *net_dev;
> + struct dpa_priv_s *priv;
> +
> + dev = &pdev->dev;
> + net_dev = dev_get_drvdata(dev);
> +
> + priv = netdev_priv(net_dev);
> +
> + dev_set_drvdata(dev, NULL);
> + unregister_netdev(net_dev);
> +
> + err = dpa_fq_free(dev, &priv->dpa_fq_list);
> +
> + qman_delete_cgr_safe(&priv->ingress_cgr);
> + qman_release_cgrid(priv->ingress_cgr.cgrid);
> + qman_delete_cgr_safe(&priv->cgr_data.cgr);
> + qman_release_cgrid(priv->cgr_data.cgr.cgrid);
> +
> + dpa_private_napi_del(net_dev);
> +
> + dpa_bp_free(priv);
> +
> + if (priv->buf_layout)
> + devm_kfree(dev, priv->buf_layout);
> +
> + free_netdev(net_dev);
> +
> + return err;
> +}
> +EXPORT_SYMBOL(dpa_remove);
> +
> +struct mac_device * __cold __must_check
> +__attribute__((nonnull))
> +dpa_mac_dev_get(struct platform_device *pdev)
> +{
> + struct device *dpa_dev, *dev;
> + struct device_node *mac_node;
> + struct platform_device *of_dev;
> + struct mac_device *mac_dev;
> + struct dpaa_eth_data *eth_data;
> +
> + dpa_dev = &pdev->dev;
> + eth_data = dpa_dev->platform_data;
> + if (!eth_data)
> + return ERR_PTR(-ENODEV);
> +
> + mac_node = eth_data->mac_node;
> +
> + of_dev = of_find_device_by_node(mac_node);
> + if (unlikely(!of_dev)) {
> + dev_err(dpa_dev, "of_find_device_by_node(%s) failed\n",
> + mac_node->full_name);
> + of_node_put(mac_node);
> + return ERR_PTR(-EINVAL);
> + }
> + of_node_put(mac_node);
> +
> + dev = &of_dev->dev;
> +
> + mac_dev = dev_get_drvdata(dev);
> + if (unlikely(!mac_dev)) {
> + dev_err(dpa_dev, "dev_get_drvdata(%s) failed\n",
> + dev_name(dev));
> + return ERR_PTR(-EINVAL);
> + }
> +
> + return mac_dev;
> +}
> +EXPORT_SYMBOL(dpa_mac_dev_get);

why is this exported?

> +
> +int dpa_mac_hw_index_get(struct platform_device *pdev)
> +{
> + struct device *dpa_dev;
> + struct dpaa_eth_data *eth_data;
> +
> + dpa_dev = &pdev->dev;
> + eth_data = dpa_dev->platform_data;
> +
> + return eth_data->mac_hw_id;
> +}
> +
> +int dpa_mac_fman_index_get(struct platform_device *pdev)
> +{
> + struct device *dpa_dev;
> + struct dpaa_eth_data *eth_data;
> +
> + dpa_dev = &pdev->dev;
> + eth_data = dpa_dev->platform_data;
> +
> + return eth_data->fman_hw_id;
> +}
> +
> +int dpa_set_mac_address(struct net_device *net_dev, void *addr)
> +{
> + const struct dpa_priv_s *priv;
> + int _errno;
> + struct mac_device *mac_dev;
> +
> + priv = netdev_priv(net_dev);
> +
> + _errno = eth_mac_addr(net_dev, addr);
> + if (_errno < 0) {
> + if (netif_msg_drv(priv))
> + netdev_err(net_dev,
> + "eth_mac_addr() = %d\n",
> + _errno);
> + return _errno;
> + }
> +
> + mac_dev = priv->mac_dev;
> +
> + _errno = mac_dev->change_addr(mac_dev->get_mac_handle(mac_dev),
> + (enet_addr_t *)net_dev->dev_addr);
> + if (_errno < 0) {
> + if (netif_msg_drv(priv))
> + netdev_err(net_dev,
> + "mac_dev->change_addr() = %d\n",
> + _errno);
> + return _errno;
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(dpa_set_mac_address);
> +
> +void dpa_set_rx_mode(struct net_device *net_dev)
> +{
> + int _errno;
> + const struct dpa_priv_s *priv;
> +
> + priv = netdev_priv(net_dev);
> +
> + if (!!(net_dev->flags & IFF_PROMISC) != priv->mac_dev->promisc) {
> + priv->mac_dev->promisc = !priv->mac_dev->promisc;
> + _errno = priv->mac_dev->set_promisc(
> + priv->mac_dev->get_mac_handle(priv->mac_dev),
> + priv->mac_dev->promisc);
> + if (unlikely(_errno < 0) && netif_msg_drv(priv))
> + netdev_err(net_dev,
> + "mac_dev->set_promisc() = %d\n",
> + _errno);
> + }
> +
> + _errno = priv->mac_dev->set_multi(net_dev, priv->mac_dev);
> + if (unlikely(_errno < 0) && netif_msg_drv(priv))
> + netdev_err(net_dev, "mac_dev->set_multi() = %d\n", _errno);
> +}
> +EXPORT_SYMBOL(dpa_set_rx_mode);
> +
> +void dpa_set_buffers_layout(struct mac_device *mac_dev,
> + struct dpa_buffer_layout_s *layout)
> +{
> + struct fm_port_params params;
> +
> + /* Rx */
> + layout[RX].priv_data_size = (u16)DPA_RX_PRIV_DATA_SIZE;
> + layout[RX].parse_results = true;
> + layout[RX].hash_results = true;
> +
> + fm_port_get_buff_layout_ext_params(mac_dev->port_dev[RX], &params);
> + /* a value of zero for data alignment means "don't care", so align to
> + * a non-zero value to prevent FMD from using its own default
> + */
> + layout[RX].data_align = params.data_align ? : DPA_FD_DATA_ALIGNMENT;
> +
> + /* Tx */
> + layout[TX].priv_data_size = DPA_TX_PRIV_DATA_SIZE;
> + layout[TX].parse_results = true;
> + layout[TX].hash_results = true;
> +
> + fm_port_get_buff_layout_ext_params(mac_dev->port_dev[TX], &params);
> + layout[TX].data_align = params.data_align ? : DPA_FD_DATA_ALIGNMENT;
> +}
> +EXPORT_SYMBOL(dpa_set_buffers_layout);
> +
> +int __attribute__((nonnull))
> +dpa_bp_alloc(struct dpa_bp *dpa_bp)
> +{
> + int err;
> + struct bman_pool_params bp_params;
> + struct platform_device *pdev;
> +
> + if (dpa_bp->size == 0 || dpa_bp->config_count == 0) {
> + pr_err("Buffer pool is not properly initialized! Missing size or initial number of buffers");
> + return -EINVAL;
> + }
> +
> + memset(&bp_params, 0, sizeof(struct bman_pool_params));
> +
> + /* If the pool is already specified, we only create one per bpid */
> + if (dpa_bpid2pool_use(dpa_bp->bpid))
> + return 0;
> +
> + if (dpa_bp->bpid == 0)
> + bp_params.flags |= BMAN_POOL_FLAG_DYNAMIC_BPID;
> + else
> + bp_params.bpid = dpa_bp->bpid;
> +
> + dpa_bp->pool = bman_new_pool(&bp_params);
> + if (unlikely(!dpa_bp->pool)) {
> + pr_err("bman_new_pool() failed\n");
> + return -ENODEV;
> + }
> +
> + dpa_bp->bpid = (u8)bman_get_params(dpa_bp->pool)->bpid;
> +
> + pdev = platform_device_register_simple("DPAA_bpool",
> + dpa_bp->bpid, NULL, 0);
> + if (IS_ERR(pdev)) {
> + err = PTR_ERR(pdev);
> + goto pdev_register_failed;
> + }
> +
> + err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(40));
> + if (err)
> + goto pdev_mask_failed;
> +
> + dpa_bp->dev = &pdev->dev;
> +
> + if (dpa_bp->seed_cb) {
> + err = dpa_bp->seed_cb(dpa_bp);
> + if (err)
> + goto pool_seed_failed;
> + }
> +
> + dpa_bpid2pool_map(dpa_bp->bpid, dpa_bp);
> +
> + return 0;
> +
> +pool_seed_failed:
> +pdev_mask_failed:
> + platform_device_unregister(pdev);
> +pdev_register_failed:
> + bman_free_pool(dpa_bp->pool);
> +
> + return err;
> +}
> +EXPORT_SYMBOL(dpa_bp_alloc);
> +
> +void dpa_bp_drain(struct dpa_bp *bp)
> +{
> + int ret;
> + u8 num = 8;
> +
> + do {
> + struct bm_buffer bmb[8];
> + int i;
> +
> + ret = bman_acquire(bp->pool, bmb, num, 0);
> + if (ret < 0) {
> + if (num == 8) {
> + /* we have less than 8 buffers left;
> + * drain them one by one
> + */
> + num = 1;
> + ret = 1;
> + continue;
> + } else {
> + /* Pool is fully drained */
> + break;
> + }
> + }
> +
> + for (i = 0; i < num; i++) {
> + dma_addr_t addr = bm_buf_addr(&bmb[i]);
> +
> + dma_unmap_single(bp->dev, addr, bp->size,
> + DMA_BIDIRECTIONAL);
> +
> + bp->free_buf_cb(phys_to_virt(addr));
> + }
> + } while (ret > 0);
> +}
> +
> +static void __cold __attribute__((nonnull))
> +_dpa_bp_free(struct dpa_bp *dpa_bp)
> +{
> + struct dpa_bp *bp = dpa_bpid2pool(dpa_bp->bpid);
> +
> + /* the mapping between bpid and dpa_bp is done very late in the
> + * allocation procedure; if something failed before the mapping, the bp
> + * was not configured, therefore we don't need the below instructions
> + */
> + if (!bp)
> + return;
> +
> + if (!atomic_dec_and_test(&bp->refs))
> + return;
> +
> + if (bp->free_buf_cb)
> + dpa_bp_drain(bp);
> +
> + dpa_bp_array[bp->bpid] = NULL;
> + bman_free_pool(bp->pool);
> +
> + if (bp->dev)
> + platform_device_unregister(to_platform_device(bp->dev));
> +}
> +
> +void __cold __attribute__((nonnull))
> +dpa_bp_free(struct dpa_priv_s *priv)
> +{
> + int i;
> +
> + for (i = 0; i < priv->bp_count; i++)
> + _dpa_bp_free(&priv->dpa_bp[i]);
> +}
> +EXPORT_SYMBOL(dpa_bp_free);
> +
> +struct dpa_bp *dpa_bpid2pool(int bpid)
> +{
> + return dpa_bp_array[bpid];
> +}
> +EXPORT_SYMBOL(dpa_bpid2pool);
> +
> +void dpa_bpid2pool_map(int bpid, struct dpa_bp *dpa_bp)
> +{
> + dpa_bp_array[bpid] = dpa_bp;
> + atomic_set(&dpa_bp->refs, 1);
> +}
> +
> +bool dpa_bpid2pool_use(int bpid)
> +{
> + if (dpa_bpid2pool(bpid)) {
> + atomic_inc(&dpa_bp_array[bpid]->refs);
> + return true;
> + }
> +
> + return false;
> +}
> +
> +struct dpa_fq *dpa_fq_alloc(struct device *dev,
> + const struct fqid_cell *fqids,
> + struct list_head *list,
> + enum dpa_fq_type fq_type)
> +{
> + int i;
> + struct dpa_fq *dpa_fq;
> +
> + dpa_fq = devm_kzalloc(dev, sizeof(*dpa_fq) * fqids->count, GFP_KERNEL);
> + if (!dpa_fq)
> + return NULL;
> +
> + for (i = 0; i < fqids->count; i++) {
> + dpa_fq[i].fq_type = fq_type;
> + dpa_fq[i].fqid = fqids->start ? fqids->start + i : 0;
> + list_add_tail(&dpa_fq[i].list, list);
> + }
> +
> + for (i = 0; i < fqids->count; i++)
> + _dpa_assign_wq(dpa_fq + i);
> +
> + return dpa_fq;
> +}
> +EXPORT_SYMBOL(dpa_fq_alloc);
> +
> +int dpa_fq_probe_mac(struct device *dev, struct list_head *list,
> + struct fm_port_fqs *port_fqs,
> + bool alloc_tx_conf_fqs,
> + enum port_type ptype)
> +{
> + const struct fqid_cell *fqids;
> + struct dpa_fq *dpa_fq;
> + int num_ranges;
> + int i;
> +
> + if (ptype == TX && alloc_tx_conf_fqs) {
> + if (!dpa_fq_alloc(dev, tx_confirm_fqids, list,
> + FQ_TYPE_TX_CONF_MQ))
> + goto fq_alloc_failed;
> + }
> +
> + fqids = default_fqids[ptype];
> + num_ranges = 3;
> +
> + for (i = 0; i < num_ranges; i++) {
> + switch (i) {
> + case 0:
> + /* The first queue is the error queue */
> + if (fqids[i].count != 1)
> + goto invalid_error_queue;
> +
> + dpa_fq = dpa_fq_alloc(dev, &fqids[i], list,
> + ptype == RX ?
> + FQ_TYPE_RX_ERROR :
> + FQ_TYPE_TX_ERROR);
> + if (!dpa_fq)
> + goto fq_alloc_failed;
> +
> + if (ptype == RX)
> + port_fqs->rx_errq = &dpa_fq[0];
> + else
> + port_fqs->tx_errq = &dpa_fq[0];
> + break;
> + case 1:
> + /* the second queue is the default queue */
> + if (fqids[i].count != 1)
> + goto invalid_default_queue;
> +
> + dpa_fq = dpa_fq_alloc(dev, &fqids[i], list,
> + ptype == RX ?
> + FQ_TYPE_RX_DEFAULT :
> + FQ_TYPE_TX_CONFIRM);
> + if (!dpa_fq)
> + goto fq_alloc_failed;
> +
> + if (ptype == RX)
> + port_fqs->rx_defq = &dpa_fq[0];
> + else
> + port_fqs->tx_defq = &dpa_fq[0];
> + break;
> + default:
> + /* all subsequent queues are Tx */
> + if (!dpa_fq_alloc(dev, &fqids[i], list, FQ_TYPE_TX))
> + goto fq_alloc_failed;
> + break;
> + }
> + }
> +
> + return 0;
> +
> +fq_alloc_failed:
> + dev_err(dev, "dpa_fq_alloc() failed\n");
> + return -ENOMEM;
> +
> +invalid_default_queue:
> +invalid_error_queue:
> + dev_err(dev, "Too many default or error queues\n");
> + return -EINVAL;
> +}
> +EXPORT_SYMBOL(dpa_fq_probe_mac);
> +
> +static u32 rx_pool_channel;
> +static DEFINE_SPINLOCK(rx_pool_channel_init);
> +
> +int dpa_get_channel(void)
> +{
> + spin_lock(&rx_pool_channel_init);
> + if (!rx_pool_channel) {
> + u32 pool;
> + int ret = qman_alloc_pool(&pool);
> +
> + if (!ret)
> + rx_pool_channel = pool;
> + }
> + spin_unlock(&rx_pool_channel_init);
> + if (!rx_pool_channel)
> + return -ENOMEM;
> + return rx_pool_channel;
> +}
> +EXPORT_SYMBOL(dpa_get_channel);
> +
> +void dpa_release_channel(void)
> +{
> + qman_release_pool(rx_pool_channel);
> +}
> +EXPORT_SYMBOL(dpa_release_channel);
> +
> +int dpaa_eth_add_channel(void *__arg)
> +{
> + const cpumask_t *cpus = qman_affine_cpus();
> + u32 pool = QM_SDQCR_CHANNELS_POOL_CONV((u16)(unsigned long)__arg);
> + int cpu;
> + struct qman_portal *portal;
> +
> + for_each_cpu(cpu, cpus) {
> + portal = (struct qman_portal *)qman_get_affine_portal(cpu);
> + qman_p_static_dequeue_add(portal, pool);
> + }
> + return 0;
> +}
> +EXPORT_SYMBOL(dpaa_eth_add_channel);
> +
> +/**
> + * Congestion group state change notification callback.
> + * Stops the device's egress queues while they are congested and
> + * wakes them upon exiting congested state.
> + * Also updates some CGR-related stats.
> + */
> +static void dpaa_eth_cgscn(struct qman_portal *qm, struct qman_cgr *cgr,
> + int congested)
> +{
> + struct dpa_priv_s *priv = (struct dpa_priv_s *)container_of(cgr,
> + struct dpa_priv_s, cgr_data.cgr);
> +
> + if (congested)
> + netif_tx_stop_all_queues(priv->net_dev);
> + else
> + netif_tx_wake_all_queues(priv->net_dev);
> +}
> +
> +int dpaa_eth_cgr_init(struct dpa_priv_s *priv)
> +{
> + struct qm_mcc_initcgr initcgr;
> + u32 cs_th;
> + int err;
> +
> + err = qman_alloc_cgrid(&priv->cgr_data.cgr.cgrid);
> + if (err < 0) {
> + pr_err("Error %d allocating CGR ID\n", err);
> + goto out_error;
> + }
> + priv->cgr_data.cgr.cb = dpaa_eth_cgscn;
> +
> + /* Enable Congestion State Change Notifications and CS taildrop */
> + initcgr.we_mask = QM_CGR_WE_CSCN_EN | QM_CGR_WE_CS_THRES;
> + initcgr.cgr.cscn_en = QM_CGR_EN;
> +
> + /* Set different thresholds based on the MAC speed.
> + * This may turn suboptimal if the MAC is reconfigured at a speed
> + * lower than its max, e.g. if a dTSEC later negotiates a 100Mbps link.
> + * In such cases, we ought to reconfigure the threshold, too.
> + */
> + if (priv->mac_dev->if_support & SUPPORTED_10000baseT_Full)
> + cs_th = CONFIG_FSL_DPAA_CS_THRESHOLD_10G;
> + else
> + cs_th = CONFIG_FSL_DPAA_CS_THRESHOLD_1G;
> + qm_cgr_cs_thres_set64(&initcgr.cgr.cs_thres, cs_th, 1);
> +
> + initcgr.we_mask |= QM_CGR_WE_CSTD_EN;
> + initcgr.cgr.cstd_en = QM_CGR_EN;
> +
> + err = qman_create_cgr(&priv->cgr_data.cgr, QMAN_CGR_FLAG_USE_INIT,
> + &initcgr);
> + if (err < 0) {
> + pr_err("Error %d creating CGR with ID %d\n", err,
> + priv->cgr_data.cgr.cgrid);
> + qman_release_cgrid(priv->cgr_data.cgr.cgrid);
> + goto out_error;
> + }
> + pr_debug("Created CGR %d for netdev with hwaddr %pM on QMan channel %d\n",
> + priv->cgr_data.cgr.cgrid, priv->mac_dev->addr,
> + priv->cgr_data.cgr.chan);
> +
> +out_error:
> + return err;
> +}
> +EXPORT_SYMBOL(dpaa_eth_cgr_init);
> +
> +static inline void dpa_setup_ingress(const struct dpa_priv_s *priv,
> + struct dpa_fq *fq,
> + const struct qman_fq *template)
> +{
> + fq->fq_base = *template;
> + fq->net_dev = priv->net_dev;
> +
> + fq->flags = QMAN_FQ_FLAG_NO_ENQUEUE;
> + fq->channel = priv->channel;
> +}
> +
> +static inline void dpa_setup_egress(const struct dpa_priv_s *priv,
> + struct dpa_fq *fq,
> + struct fm_port *port,
> + const struct qman_fq *template)
> +{
> + fq->fq_base = *template;
> + fq->net_dev = priv->net_dev;
> +
> + if (port) {
> + fq->flags = QMAN_FQ_FLAG_TO_DCPORTAL;
> + fq->channel = (u16)fm_get_tx_port_channel(port);
> + } else {
> + fq->flags = QMAN_FQ_FLAG_NO_MODIFY;
> + }
> +}
> +
> +void dpa_fq_setup(struct dpa_priv_s *priv, const struct dpa_fq_cbs_t *fq_cbs,
> + struct fm_port *tx_port)
> +{
> + struct dpa_fq *fq;
> + u16 portals[NR_CPUS];
> + int cpu, num_portals = 0;
> + const cpumask_t *affine_cpus = qman_affine_cpus();
> + int egress_cnt = 0, conf_cnt = 0;
> +
> + for_each_cpu(cpu, affine_cpus)
> + portals[num_portals++] = qman_affine_channel(cpu);
> + if (num_portals == 0)
> + dev_err(priv->net_dev->dev.parent,
> + "No Qman software (affine) channels found");
> +
> + /* Initialize each FQ in the list */
> + list_for_each_entry(fq, &priv->dpa_fq_list, list) {
> + switch (fq->fq_type) {
> + case FQ_TYPE_RX_DEFAULT:
> + BUG_ON(!priv->mac_dev);
> + dpa_setup_ingress(priv, fq, &fq_cbs->rx_defq);
> + break;
> + case FQ_TYPE_RX_ERROR:
> + BUG_ON(!priv->mac_dev);
> + dpa_setup_ingress(priv, fq, &fq_cbs->rx_errq);
> + break;
> + case FQ_TYPE_TX:
> + dpa_setup_egress(priv, fq, tx_port,
> + &fq_cbs->egress_ern);
> + /* If we have more Tx queues than the number of cores,
> + * just ignore the extra ones.
> + */
> + if (egress_cnt < DPAA_ETH_TX_QUEUES)
> + priv->egress_fqs[egress_cnt++] = &fq->fq_base;
> + break;
> + case FQ_TYPE_TX_CONFIRM:
> + BUG_ON(!priv->mac_dev);
> + dpa_setup_ingress(priv, fq, &fq_cbs->tx_defq);
> + break;
> + case FQ_TYPE_TX_CONF_MQ:
> + BUG_ON(!priv->mac_dev);
> + dpa_setup_ingress(priv, fq, &fq_cbs->tx_defq);
> + priv->conf_fqs[conf_cnt++] = &fq->fq_base;
> + break;
> + case FQ_TYPE_TX_ERROR:
> + BUG_ON(!priv->mac_dev);
> + dpa_setup_ingress(priv, fq, &fq_cbs->tx_errq);
> + break;
> + default:
> + dev_warn(priv->net_dev->dev.parent,
> + "Unknown FQ type detected!\n");
> + break;
> + }
> + }
> +
> + /* The number of Tx queues may be smaller than the number of cores, if
> + * the Tx queue range is specified in the device tree instead of being
> + * dynamically allocated.
> + * Make sure all CPUs receive a corresponding Tx queue.
> + */
> + while (egress_cnt < DPAA_ETH_TX_QUEUES) {
> + list_for_each_entry(fq, &priv->dpa_fq_list, list) {
> + if (fq->fq_type != FQ_TYPE_TX)
> + continue;
> + priv->egress_fqs[egress_cnt++] = &fq->fq_base;
> + if (egress_cnt == DPAA_ETH_TX_QUEUES)
> + break;
> + }
> + }
> +}
> +EXPORT_SYMBOL(dpa_fq_setup);
> +
> +int dpa_fq_init(struct dpa_fq *dpa_fq, bool td_enable)
> +{
> + int _errno;
> + const struct dpa_priv_s *priv;
> + struct device *dev;
> + struct qman_fq *fq;
> + struct qm_mcc_initfq initfq;
> + struct qman_fq *confq;
> +
> + priv = netdev_priv(dpa_fq->net_dev);
> + dev = dpa_fq->net_dev->dev.parent;
> +
> + if (dpa_fq->fqid == 0)
> + dpa_fq->flags |= QMAN_FQ_FLAG_DYNAMIC_FQID;
> +
> + dpa_fq->init = !(dpa_fq->flags & QMAN_FQ_FLAG_NO_MODIFY);
> +
> + _errno = qman_create_fq(dpa_fq->fqid, dpa_fq->flags, &dpa_fq->fq_base);
> + if (_errno) {
> + dev_err(dev, "qman_create_fq() failed\n");
> + return _errno;
> + }
> + fq = &dpa_fq->fq_base;
> +
> + if (dpa_fq->init) {
> + initfq.we_mask = QM_INITFQ_WE_FQCTRL;
> + /* FIXME: why would we want to keep an empty FQ in cache? */
> + initfq.fqd.fq_ctrl = QM_FQCTRL_PREFERINCACHE;
> +
> + /* Try to reduce the number of portal interrupts for
> + * Tx Confirmation FQs.
> + */
> + if (dpa_fq->fq_type == FQ_TYPE_TX_CONFIRM)
> + initfq.fqd.fq_ctrl |= QM_FQCTRL_HOLDACTIVE;
> +
> + /* FQ placement */
> + initfq.we_mask |= QM_INITFQ_WE_DESTWQ;
> +
> + initfq.fqd.dest.channel = dpa_fq->channel;
> + initfq.fqd.dest.wq = dpa_fq->wq;
> +
> + /* Put all egress queues in a congestion group of their own.
> + * Sensu stricto, the Tx confirmation queues are Rx FQs,
> + * rather than Tx - but they nonetheless account for the
> + * memory footprint on behalf of egress traffic. We therefore
> + * place them in the netdev's CGR, along with the Tx FQs.
> + */
> + if (dpa_fq->fq_type == FQ_TYPE_TX ||
> + dpa_fq->fq_type == FQ_TYPE_TX_CONFIRM ||
> + dpa_fq->fq_type == FQ_TYPE_TX_CONF_MQ) {
> + initfq.we_mask |= QM_INITFQ_WE_CGID;
> + initfq.fqd.fq_ctrl |= QM_FQCTRL_CGE;
> + initfq.fqd.cgid = (u8)priv->cgr_data.cgr.cgrid;
> + /* Set a fixed overhead accounting, in an attempt to
> + * reduce the impact of fixed-size skb shells and the
> + * driver's needed headroom on system memory. This is
> + * especially the case when the egress traffic is
> + * composed of small datagrams.
> + * Unfortunately, QMan's OAL value is capped to an
> + * insufficient value, but even that is better than
> + * no overhead accounting at all.
> + */
> + initfq.we_mask |= QM_INITFQ_WE_OAC;
> + initfq.fqd.oac_init.oac = QM_OAC_CG;
> + initfq.fqd.oac_init.oal =
> + (signed char)(min(sizeof(struct sk_buff) +
> + priv->tx_headroom,
> + (size_t)FSL_QMAN_MAX_OAL));
> + }
> +
> + if (td_enable) {
> + initfq.we_mask |= QM_INITFQ_WE_TDTHRESH;
> + qm_fqd_taildrop_set(&initfq.fqd.td,
> + DPA_FQ_TD, 1);
> + initfq.fqd.fq_ctrl = QM_FQCTRL_TDE;
> + }
> +
> + /* Configure the Tx confirmation queue, now that we know
> + * which Tx queue it pairs with.
> + */
> + if (dpa_fq->fq_type == FQ_TYPE_TX) {
> + confq = _dpa_get_tx_conf_queue(priv, &dpa_fq->fq_base);
> + if (confq) {
> + initfq.we_mask |= QM_INITFQ_WE_CONTEXTA;
> + /* ContextA: OVOM=1 (use contextA2 bits instead of ICAD)
> + * A2V=1 (contextA A2 field is valid)
> + * A0V=1 (contextA A0 field is valid)
> + * ContextA A2: EBD=1 (deallocate buffers inside FMan)
> + */
> + initfq.fqd.context_a.hi = 0x1a000000;
> + initfq.fqd.context_a.lo = 0x80000000;
> + }
> + }
> +
> + /* Put all *private* ingress queues in our "ingress CGR". */
> + if (priv->use_ingress_cgr &&
> + (dpa_fq->fq_type == FQ_TYPE_RX_DEFAULT ||
> + dpa_fq->fq_type == FQ_TYPE_RX_ERROR)) {
> + initfq.we_mask |= QM_INITFQ_WE_CGID;
> + initfq.fqd.fq_ctrl |= QM_FQCTRL_CGE;
> + initfq.fqd.cgid = (u8)priv->ingress_cgr.cgrid;
> + /* Set a fixed overhead accounting, just like for the
> + * egress CGR.
> + */
> + initfq.we_mask |= QM_INITFQ_WE_OAC;
> + initfq.fqd.oac_init.oac = QM_OAC_CG;
> + initfq.fqd.oac_init.oal =
> + (signed char)(min(sizeof(struct sk_buff) +
> + priv->tx_headroom, (size_t)FSL_QMAN_MAX_OAL));
> + }
> +
> + /* Initialization common to all ingress queues */
> + if (dpa_fq->flags & QMAN_FQ_FLAG_NO_ENQUEUE) {
> + initfq.we_mask |= QM_INITFQ_WE_CONTEXTA;
> + initfq.fqd.fq_ctrl |=
> + QM_FQCTRL_CTXASTASHING | QM_FQCTRL_AVOIDBLOCK;
> + initfq.fqd.context_a.stashing.exclusive =
> + QM_STASHING_EXCL_DATA | QM_STASHING_EXCL_CTX |
> + QM_STASHING_EXCL_ANNOTATION;
> + initfq.fqd.context_a.stashing.data_cl = 2;
> + initfq.fqd.context_a.stashing.annotation_cl = 1;
> + initfq.fqd.context_a.stashing.context_cl =
> + DIV_ROUND_UP(sizeof(struct qman_fq), 64);
> + }
> +
> + _errno = qman_init_fq(fq, QMAN_INITFQ_FLAG_SCHED, &initfq);
> + if (_errno < 0) {
> + dev_err(dev, "qman_init_fq(%u) = %d\n",
> + qman_fq_fqid(fq), _errno);
> + qman_destroy_fq(fq, 0);
> + return _errno;
> + }
> + }
> +
> + dpa_fq->fqid = qman_fq_fqid(fq);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(dpa_fq_init);
> +
> +static int __cold __attribute__((nonnull))
> +_dpa_fq_free(struct device *dev, struct qman_fq *fq)
> +{
> + int _errno, __errno;
> + struct dpa_fq *dpa_fq;
> + const struct dpa_priv_s *priv;
> +
> + _errno = 0;
> +
> + dpa_fq = container_of(fq, struct dpa_fq, fq_base);
> + priv = netdev_priv(dpa_fq->net_dev);
> +
> + if (dpa_fq->init) {
> + _errno = qman_retire_fq(fq, NULL);
> + if (unlikely(_errno < 0) && netif_msg_drv(priv))
> + dev_err(dev, "qman_retire_fq(%u) = %d\n",
> + qman_fq_fqid(fq), _errno);
> +
> + __errno = qman_oos_fq(fq);
> + if (unlikely(__errno < 0) && netif_msg_drv(priv)) {
> + dev_err(dev, "qman_oos_fq(%u) = %d\n",
> + qman_fq_fqid(fq), __errno);
> + if (_errno >= 0)
> + _errno = __errno;
> + }
> + }
> +
> + qman_destroy_fq(fq, 0);
> + list_del(&dpa_fq->list);
> +
> + return _errno;
> +}
> +
> +int __cold __attribute__((nonnull))
> +dpa_fq_free(struct device *dev, struct list_head *list)
> +{
> + int _errno, __errno;
> + struct dpa_fq *dpa_fq, *tmp;
> +
> + _errno = 0;
> + list_for_each_entry_safe(dpa_fq, tmp, list, list) {
> + __errno = _dpa_fq_free(dev, (struct qman_fq *)dpa_fq);
> + if (unlikely(__errno < 0) && _errno >= 0)
> + _errno = __errno;
> + }
> +
> + return _errno;
> +}
> +EXPORT_SYMBOL(dpa_fq_free);
> +
> +static void
> +dpaa_eth_init_tx_port(struct fm_port *port, struct dpa_fq *errq,
> + struct dpa_fq *defq,
> + struct dpa_buffer_layout_s *buf_layout)
> +{
> + struct fm_port_params tx_port_param;
> +
> + memset(&tx_port_param, 0, sizeof(tx_port_param));
> + dpaa_eth_init_port(tx, port, tx_port_param, errq->fqid, defq->fqid,
> + buf_layout, false);
> +}
> +
> +static void
> +dpaa_eth_init_rx_port(struct fm_port *port, struct dpa_bp *bp, size_t count,
> + struct dpa_fq *errq, struct dpa_fq *defq,
> + struct dpa_buffer_layout_s *buf_layout)
> +{
> + struct fm_port_params rx_port_param;
> + int i;
> +
> + memset(&rx_port_param, 0, sizeof(rx_port_param));
> + count = min(ARRAY_SIZE(rx_port_param.pool_param), count);
> + rx_port_param.num_pools = (u8)count;
> + for (i = 0; i < count; i++) {
> + if (i >= rx_port_param.num_pools)
> + break;
> + rx_port_param.pool_param[i].id = bp[i].bpid;
> + rx_port_param.pool_param[i].size = (u16)bp[i].size;
> + }
> +
> + dpaa_eth_init_port(rx, port, rx_port_param, errq->fqid, defq->fqid,
> + buf_layout, false);
> +}
> +
> +void dpaa_eth_init_ports(struct mac_device *mac_dev,
> + struct dpa_bp *bp, size_t count,
> + struct fm_port_fqs *port_fqs,
> + struct dpa_buffer_layout_s *buf_layout,
> + struct device *dev)
> +{
> + struct fm_port *rxport = mac_dev->port_dev[RX];
> + struct fm_port *txport = mac_dev->port_dev[TX];
> +
> + dpaa_eth_init_tx_port(txport, port_fqs->tx_errq,
> + port_fqs->tx_defq, &buf_layout[TX]);
> + dpaa_eth_init_rx_port(rxport, bp, count, port_fqs->rx_errq,
> + port_fqs->rx_defq, &buf_layout[RX]);
> +}
> +EXPORT_SYMBOL(dpaa_eth_init_ports);
> +
> +void __attribute__((nonnull))
> +dpa_fd_release(const struct net_device *net_dev, const struct qm_fd *fd)
> +{
> + struct dpa_bp *_dpa_bp;
> + struct bm_buffer _bmb;
> +
> + _bmb.hi = fd->addr_hi;
> + _bmb.lo = fd->addr_lo;
> +
> + _dpa_bp = dpa_bpid2pool(fd->bpid);
> + DPA_ERR_ON(!_dpa_bp);
> +
> + DPA_ERR_ON(fd->format == qm_fd_sg);
> +
> + while (bman_release(_dpa_bp->pool, &_bmb, 1, 0))
> + cpu_relax();
> +}
> +EXPORT_SYMBOL(dpa_fd_release);
> +
> +/**
> + * Turn on HW checksum computation for this outgoing frame.
> + * If the current protocol is not something we support in this regard
> + * (or if the stack has already computed the SW checksum), we do nothing.
> + *
> + * Returns 0 if all goes well (or HW csum doesn't apply), and a negative value
> + * otherwise.
> + *
> + * Note that this function may modify the fd->cmd field and the skb data buffer
> + * (the Parse Results area).
> + */
> +int dpa_enable_tx_csum(struct dpa_priv_s *priv,
> + struct sk_buff *skb,
> + struct qm_fd *fd,
> + char *parse_results)
> +{
> + fm_prs_result *parse_result;
> + struct iphdr *iph;
> + struct ipv6hdr *ipv6h = NULL;
> + int l4_proto;
> + int ethertype = ntohs(skb->protocol);
> + int retval = 0;
> +
> + if (skb->ip_summed != CHECKSUM_PARTIAL)
> + return 0;
> +
> + /* Note: L3 csum seems to be already computed in sw, but we can't choose
> + * L4 alone from the FM configuration anyway.
> + */
> +
> + /* Fill in some fields of the Parse Results array, so the FMan
> + * can find them as if they came from the FMan Parser.
> + */
> + parse_result = (fm_prs_result *)parse_results;
> +
> + /* If we're dealing with VLAN, get the real Ethernet type */
> + if (ethertype == ETH_P_8021Q) {
> + /* We can't always assume the MAC header is set correctly
> + * by the stack, so reset to beginning of skb->data
> + */
> + skb_reset_mac_header(skb);
> + ethertype = ntohs(vlan_eth_hdr(skb)->h_vlan_encapsulated_proto);
> + }
> +
> + /* Fill in the relevant L3 parse result fields
> + * and read the L4 protocol type
> + */
> + switch (ethertype) {
> + case ETH_P_IP:
> + parse_result->l3r = FM_L3_PARSE_RESULT_IPV4;
> + iph = ip_hdr(skb);
> + DPA_ERR_ON(!iph);
> + l4_proto = ntohs(iph->protocol);
> + break;
> + case ETH_P_IPV6:
> + parse_result->l3r = FM_L3_PARSE_RESULT_IPV6;
> + ipv6h = ipv6_hdr(skb);
> + DPA_ERR_ON(!ipv6h);
> + l4_proto = ntohs(ipv6h->nexthdr);
> + break;
> + default:
> + /* We shouldn't even be here */
> + if (netif_msg_tx_err(priv) && net_ratelimit())
> + netdev_alert(priv->net_dev,
> + "Can't compute HW csum for L3 proto 0x%x\n",
> + ntohs(skb->protocol));
> + retval = -EIO;
> + goto return_error;
> + }
> +
> + /* Fill in the relevant L4 parse result fields */
> + switch (l4_proto) {
> + case IPPROTO_UDP:
> + parse_result->l4r = FM_L4_PARSE_RESULT_UDP;
> + break;
> + case IPPROTO_TCP:
> + parse_result->l4r = FM_L4_PARSE_RESULT_TCP;
> + break;
> + default:
> + /* This can as well be a BUG() */
> + if (netif_msg_tx_err(priv) && net_ratelimit())
> + netdev_alert(priv->net_dev,
> + "Can't compute HW csum for L4 proto 0x%x\n",
> + l4_proto);
> + retval = -EIO;
> + goto return_error;
> + }
> +
> + /* At index 0 is IPOffset_1 as defined in the Parse Results */
> + parse_result->ip_off[0] = (u8)skb_network_offset(skb);
> + parse_result->l4_off = (u8)skb_transport_offset(skb);
> +
> + /* Enable L3 (and L4, if TCP or UDP) HW checksum. */
> + fd->cmd |= FM_FD_CMD_RPD | FM_FD_CMD_DTC;
> +
> + /* On P1023 and similar platforms fd->cmd interpretation could
> + * be disabled by setting CONTEXT_A bit ICMD; currently this bit
> + * is not set so we do not need to check; in the future, if/when
> + * using context_a we need to check this bit
> + */
> +
> +return_error:
> + return retval;
> +}
> +EXPORT_SYMBOL(dpa_enable_tx_csum);
> diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.h b/drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.h
> new file mode 100644
> index 0000000..96bc63e
> --- /dev/null
> +++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth_common.h
> @@ -0,0 +1,119 @@
> +/* Copyright 2008 - 2015 Freescale Semiconductor, Inc.
> + *
> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions are met:
> + * * Redistributions of source code must retain the above copyright
> + * notice, this list of conditions and the following disclaimer.
> + * * Redistributions in binary form must reproduce the above copyright
> + * notice, this list of conditions and the following disclaimer in the
> + * documentation and/or other materials provided with the distribution.
> + * * Neither the name of Freescale Semiconductor nor the
> + * names of its contributors may be used to endorse or promote products
> + * derived from this software without specific prior written permission.
> + *
> + * ALTERNATIVELY, this software may be distributed under the terms of the
> + * GNU General Public License ("GPL") as published by the Free Software
> + * Foundation, either version 2 of that License or (at your option) any
> + * later version.
> + *
> + * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
> + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
> + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
> + * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
> + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
> + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
> + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
> + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
> + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> + */
> +
> +#ifndef __DPAA_ETH_COMMON_H
> +#define __DPAA_ETH_COMMON_H
> +
> +#include <linux/etherdevice.h> /* struct net_device */
> +#include <soc/fsl/bman.h> /* struct bm_buffer */
> +#include <linux/of_platform.h> /* struct platform_device */
> +#include <linux/net_tstamp.h> /* struct hwtstamp_config */
> +
> +#include "dpaa_eth.h"
> +#include "fsl_fman_drv.h"
> +
> +#define dpaa_eth_init_port(type, port, param, errq_id, defq_id, buf_layout,\
> + frag_enabled) \
> +{ \
> + param.errq = errq_id; \
> + param.defq = defq_id; \
> + param.priv_data_size = buf_layout->priv_data_size; \
> + param.parse_results = buf_layout->parse_results; \
> + param.hash_results = buf_layout->hash_results; \
> + param.time_stamp = buf_layout->time_stamp; \
> + param.data_align = buf_layout->data_align; \
> + fm_set_##type##_port_params(port, &param); \
> +}
> +
> +#define DPA_BUFF_RELEASE_MAX 8 /* maximum number of buffers released at once */
> +
> +/* used in napi related functions */
> +extern u16 qman_portal_max;
> +
> +int dpa_netdev_init(struct net_device *net_dev,
> + const u8 *mac_addr,
> + u16 tx_timeout);
> +int __cold dpa_start(struct net_device *net_dev);
> +int __cold dpa_stop(struct net_device *net_dev);
> +void __cold dpa_timeout(struct net_device *net_dev);
> +struct rtnl_link_stats64 * __cold
> +dpa_get_stats64(struct net_device *net_dev,
> + struct rtnl_link_stats64 *stats);
> +int dpa_change_mtu(struct net_device *net_dev, int new_mtu);
> +int dpa_ndo_init(struct net_device *net_dev);
> +int dpa_set_features(struct net_device *dev, netdev_features_t features);
> +netdev_features_t dpa_fix_features(struct net_device *dev,
> + netdev_features_t features);
> +int __cold dpa_remove(struct platform_device *pdev);
> +struct mac_device * __cold __must_check
> +__attribute__((nonnull)) dpa_mac_dev_get(struct platform_device *pdev);
> +int dpa_mac_hw_index_get(struct platform_device *pdev);
> +int dpa_mac_fman_index_get(struct platform_device *pdev);
> +int dpa_set_mac_address(struct net_device *net_dev, void *addr);
> +void dpa_set_rx_mode(struct net_device *net_dev);
> +void dpa_set_buffers_layout(struct mac_device *mac_dev,
> + struct dpa_buffer_layout_s *layout);
> +int __attribute__((nonnull))
> +dpa_bp_alloc(struct dpa_bp *dpa_bp);
> +void __cold __attribute__((nonnull))
> +dpa_bp_free(struct dpa_priv_s *priv);
> +struct dpa_bp *dpa_bpid2pool(int bpid);
> +void dpa_bpid2pool_map(int bpid, struct dpa_bp *dpa_bp);
> +bool dpa_bpid2pool_use(int bpid);
> +void dpa_bp_drain(struct dpa_bp *bp);
> +struct dpa_fq *dpa_fq_alloc(struct device *dev,
> + const struct fqid_cell *fqids,
> + struct list_head *list,
> + enum dpa_fq_type fq_type);
> +int dpa_fq_probe_mac(struct device *dev, struct list_head *list,
> + struct fm_port_fqs *port_fqs,
> + bool tx_conf_fqs_per_core,
> + enum port_type ptype);
> +int dpa_get_channel(void);
> +void dpa_release_channel(void);
> +int dpaa_eth_add_channel(void *__arg);
> +int dpaa_eth_cgr_init(struct dpa_priv_s *priv);
> +void dpa_fq_setup(struct dpa_priv_s *priv, const struct dpa_fq_cbs_t *fq_cbs,
> + struct fm_port *tx_port);
> +int dpa_fq_init(struct dpa_fq *dpa_fq, bool td_enable);
> +int __cold __attribute__((nonnull))
> +dpa_fq_free(struct device *dev, struct list_head *list);
> +void dpaa_eth_init_ports(struct mac_device *mac_dev,
> + struct dpa_bp *bp, size_t count,
> + struct fm_port_fqs *port_fqs,
> + struct dpa_buffer_layout_s *buf_layout,
> + struct device *dev);
> +void __attribute__((nonnull))
> +dpa_fd_release(const struct net_device *net_dev, const struct qm_fd *fd);
> +int dpa_enable_tx_csum(struct dpa_priv_s *priv,
> + struct sk_buff *skb,
> + struct qm_fd *fd,
> + char *parse_results);
> +#endif /* __DPAA_ETH_COMMON_H */
> diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth_sg.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth_sg.c
> new file mode 100644
> index 0000000..ef3117e
> --- /dev/null
> +++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth_sg.c
> @@ -0,0 +1,428 @@
> +/* Copyright 2012 - 2015 Freescale Semiconductor Inc.
> + *
> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions are met:
> + * * Redistributions of source code must retain the above copyright
> + * notice, this list of conditions and the following disclaimer.
> + * * Redistributions in binary form must reproduce the above copyright
> + * notice, this list of conditions and the following disclaimer in the
> + * documentation and/or other materials provided with the distribution.
> + * * Neither the name of Freescale Semiconductor nor the
> + * names of its contributors may be used to endorse or promote products
> + * derived from this software without specific prior written permission.
> + *
> + * ALTERNATIVELY, this software may be distributed under the terms of the
> + * GNU General Public License ("GPL") as published by the Free Software
> + * Foundation, either version 2 of that License or (at your option) any
> + * later version.
> + *
> + * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
> + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
> + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
> + * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
> + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
> + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
> + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
> + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
> + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> + */
> +
> +#define pr_fmt(fmt) \
> + KBUILD_MODNAME ": " fmt
> +
> +#include <linux/init.h>
> +#include <linux/skbuff.h>
> +#include <linux/highmem.h>
> +#include <soc/fsl/bman.h>
> +
> +#include "dpaa_eth.h"
> +#include "dpaa_eth_common.h"
> +
> +/* Convenience macros for storing/retrieving the skb back-pointers.
> + *
> + * NB: @off is an offset from a (struct sk_buff **) pointer!
> + */
> +#define DPA_WRITE_SKB_PTR(skb, skbh, addr, off) \
> + { \
> + skbh = (struct sk_buff **)addr; \
> + *(skbh + (off)) = skb; \
> + }
> +#define DPA_READ_SKB_PTR(skb, skbh, addr, off) \
> + { \
> + skbh = (struct sk_buff **)addr; \
> + skb = *(skbh + (off)); \
> + }
> +
> +static int _dpa_bp_add_8_bufs(const struct dpa_bp *dpa_bp)
> +{
> + struct bm_buffer bmb[8];
> + void *new_buf;
> + dma_addr_t addr;
> + u8 i;
> + struct device *dev = dpa_bp->dev;
> + struct sk_buff *skb, **skbh;
> +
> + for (i = 0; i < 8; i++) {
> + /* We'll prepend the skb back-pointer; can't use the DPA
> + * priv space, because FMan will overwrite it (from offset 0)
> + * if it ends up being the second, third, etc. fragment
> + * in a S/G frame.
> + *
> + * We only need enough space to store a pointer, but allocate
> + * an entire cacheline for performance reasons.
> + */
> + new_buf = netdev_alloc_frag(SMP_CACHE_BYTES + DPA_BP_RAW_SIZE);
> + if (unlikely(!new_buf))
> + goto netdev_alloc_failed;
> + new_buf = PTR_ALIGN(new_buf + SMP_CACHE_BYTES, SMP_CACHE_BYTES);
> +
> + skb = build_skb(new_buf, DPA_SKB_SIZE(dpa_bp->size) +
> + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
> + if (unlikely(!skb)) {
> + put_page(virt_to_head_page(new_buf));
> + goto build_skb_failed;
> + }
> + DPA_WRITE_SKB_PTR(skb, skbh, new_buf, -1);
> +
> + addr = dma_map_single(dev, new_buf,
> + dpa_bp->size, DMA_BIDIRECTIONAL);
> + if (unlikely(dma_mapping_error(dev, addr)))
> + goto dma_map_failed;
> +
> + bm_buffer_set64(&bmb[i], addr);
> + }
> +
> +release_bufs:
> + /* Release the buffers. In case bman is busy, keep trying
> + * until successful. bman_release() is guaranteed to succeed
> + * in a reasonable amount of time
> + */
> + while (unlikely(bman_release(dpa_bp->pool, bmb, i, 0)))
> + cpu_relax();
> + return i;
> +
> +dma_map_failed:
> + kfree_skb(skb);
> +
> +build_skb_failed:
> +netdev_alloc_failed:
> + net_err_ratelimited("dpa_bp_add_8_bufs() failed\n");
> + WARN_ONCE(1, "Memory allocation failure on Rx\n");
> +
> + bm_buffer_set64(&bmb[i], 0);
> + /* Avoid releasing a completely null buffer; bman_release() requires
> + * at least one buffer.
> + */
> + if (likely(i))
> + goto release_bufs;
> +
> + return 0;
> +}
> +
> +/* Cold path wrapper over _dpa_bp_add_8_bufs(). */
> +static void dpa_bp_add_8_bufs(const struct dpa_bp *dpa_bp, int cpu)
> +{
> + int *count_ptr = per_cpu_ptr(dpa_bp->percpu_count, cpu);
> + *count_ptr += _dpa_bp_add_8_bufs(dpa_bp);
> +}
> +
> +int dpa_bp_priv_seed(struct dpa_bp *dpa_bp)
> +{
> + int i;
> +
> + /* Give each CPU an allotment of "config_count" buffers */
> + for_each_possible_cpu(i) {
> + int j;
> +
> + /* Although we access another CPU's counters here
> + * we do it at boot time so it is safe
> + */
> + for (j = 0; j < dpa_bp->config_count; j += 8)
> + dpa_bp_add_8_bufs(dpa_bp, i);
> + }
> + return 0;
> +}
> +EXPORT_SYMBOL(dpa_bp_priv_seed);
> +
> +/* Add buffers/(pages) for Rx processing whenever bpool count falls below
> + * REFILL_THRESHOLD.
> + */
> +int dpaa_eth_refill_bpools(struct dpa_bp *dpa_bp, int *countptr)
> +{
> + int count = *countptr;
> + int new_bufs;
> +
> + if (unlikely(count < FSL_DPAA_ETH_REFILL_THRESHOLD)) {
> + do {
> + new_bufs = _dpa_bp_add_8_bufs(dpa_bp);
> + if (unlikely(!new_bufs)) {
> + /* Avoid looping forever if we've temporarily
> + * run out of memory. We'll try again at the
> + * next NAPI cycle.
> + */
> + break;
> + }
> + count += new_bufs;
> + } while (count < FSL_DPAA_ETH_MAX_BUF_COUNT);
> +
> + *countptr = count;
> + if (unlikely(count < FSL_DPAA_ETH_MAX_BUF_COUNT))
> + return -ENOMEM;
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(dpaa_eth_refill_bpools);
> +
> +/* Cleanup function for outgoing frame descriptors that were built on Tx path,
> + * either contiguous frames or scatter/gather ones.
> + * Skb freeing is not handled here.
> + *
> + * This function may be called on error paths in the Tx function, so guard
> + * against cases when not all fd relevant fields were filled in.
> + *
> + * Return the skb backpointer, since for S/G frames the buffer containing it
> + * gets freed here.
> + */
> +struct sk_buff *_dpa_cleanup_tx_fd(const struct dpa_priv_s *priv,
> + const struct qm_fd *fd)
> +{
> + struct dpa_bp *dpa_bp = priv->dpa_bp;
> + dma_addr_t addr = qm_fd_addr(fd);
> + struct sk_buff **skbh;
> + struct sk_buff *skb = NULL;
> + const enum dma_data_direction dma_dir = DMA_TO_DEVICE;
> + int nr_frags;
> +
> + dma_unmap_single(dpa_bp->dev, addr, dpa_bp->size, dma_dir);
> +
> + /* retrieve skb back pointer */
> + DPA_READ_SKB_PTR(skb, skbh, phys_to_virt(addr), 0);
> + nr_frags = skb_shinfo(skb)->nr_frags;
> +
> + return skb;
> +}
> +
> +/* Build a linear skb around the received buffer.
> + * We are guaranteed there is enough room at the end of the data buffer to
> + * accommodate the shared info area of the skb.
> + */
> +static struct sk_buff *__hot contig_fd_to_skb(const struct dpa_priv_s *priv,
> + const struct qm_fd *fd)
> +{
> + struct sk_buff *skb = NULL, **skbh;
> + ssize_t fd_off = dpa_fd_offset(fd);
> + dma_addr_t addr = qm_fd_addr(fd);
> + void *vaddr;
> +
> + vaddr = phys_to_virt(addr);
> + DPA_ERR_ON(!IS_ALIGNED((unsigned long)vaddr, SMP_CACHE_BYTES));
> +
> + /* Retrieve the skb and adjust data and tail pointers, to make sure
> + * forwarded skbs will have enough space on Tx if extra headers
> + * are added.
> + */
> + DPA_READ_SKB_PTR(skb, skbh, vaddr, -1);
> +
> + DPA_ERR_ON(fd_off != priv->rx_headroom);
> + skb_reserve(skb, fd_off);
> + skb_put(skb, dpa_fd_length(fd));
> +
> + skb->ip_summed = CHECKSUM_NONE;
> +
> + return skb;
> +}
> +
> +void __hot _dpa_rx(struct net_device *net_dev,
> + struct qman_portal *portal,
> + const struct dpa_priv_s *priv,
> + struct dpa_percpu_priv_s *percpu_priv,
> + const struct qm_fd *fd,
> + u32 fqid,
> + int *count_ptr)
> +{
> + struct dpa_bp *dpa_bp;
> + struct sk_buff *skb;
> + dma_addr_t addr = qm_fd_addr(fd);
> + u32 fd_status = fd->status;
> + unsigned int skb_len;
> + struct rtnl_link_stats64 *percpu_stats = &percpu_priv->stats;
> +
> + if (unlikely(fd_status & FM_FD_STAT_RX_ERRORS) != 0) {
> + if (netif_msg_hw(priv) && net_ratelimit())
> + netdev_warn(net_dev, "FD status = 0x%08x\n",
> + fd_status & FM_FD_STAT_RX_ERRORS);
> +
> + percpu_stats->rx_errors++;
> + goto _release_frame;
> + }
> +
> + dpa_bp = priv->dpa_bp;
> + DPA_ERR_ON(dpa_bp != dpa_bpid2pool(fd->bpid));
> +
> + /* prefetch the first 64 bytes of the frame */
> + dma_unmap_single(dpa_bp->dev, addr, dpa_bp->size, DMA_BIDIRECTIONAL);
> + prefetch(phys_to_virt(addr) + dpa_fd_offset(fd));
> +
> + /* The only FD type that we may receive is contig */
> + DPA_ERR_ON((fd->format != qm_fd_contig));
> +
> + skb = contig_fd_to_skb(priv, fd);
> +
> + /* Account for the contig buffer
> + * having been removed from the pool.
> + */
> + (*count_ptr)--;
> + skb->protocol = eth_type_trans(skb, net_dev);
> +
> + /* IP Reassembled frames are allowed to be larger than MTU */
> + if (unlikely(dpa_check_rx_mtu(skb, net_dev->mtu) &&
> + !(fd_status & FM_FD_IPR))) {
> + percpu_stats->rx_dropped++;
> + goto drop_bad_frame;
> + }
> +
> + skb_len = skb->len;
> +
> + if (unlikely(netif_receive_skb(skb) == NET_RX_DROP))
> + goto packet_dropped;
> +
> + percpu_stats->rx_packets++;
> + percpu_stats->rx_bytes += skb_len;
> +
> +packet_dropped:
> + return;
> +
> +drop_bad_frame:
> + dev_kfree_skb(skb);
> + return;
> +
> +_release_frame:
> + dpa_fd_release(net_dev, fd);
> +}
> +
> +static int __hot skb_to_contig_fd(struct dpa_priv_s *priv,
> + struct sk_buff *skb, struct qm_fd *fd,
> + int *count_ptr, int *offset)
> +{
> + struct sk_buff **skbh;
> + dma_addr_t addr;
> + struct dpa_bp *dpa_bp = priv->dpa_bp;
> + struct net_device *net_dev = priv->net_dev;
> + int err;
> + enum dma_data_direction dma_dir;
> + unsigned char *buffer_start;
> +
> + {
> + /* We are guaranteed to have at least tx_headroom bytes
> + * available, so just use that for offset.
> + */
> + fd->bpid = 0xff;
> + buffer_start = skb->data - priv->tx_headroom;
> + fd->offset = priv->tx_headroom;
> + dma_dir = DMA_TO_DEVICE;
> +
> + DPA_WRITE_SKB_PTR(skb, skbh, buffer_start, 0);
> + }
> +
> + /* Enable L3/L4 hardware checksum computation.
> + *
> + * We must do this before dma_map_single(DMA_TO_DEVICE), because we may
> + * need to write into the skb.
> + */
> + err = dpa_enable_tx_csum(priv, skb, fd,
> + ((char *)skbh) + DPA_TX_PRIV_DATA_SIZE);
> + if (unlikely(err < 0)) {
> + if (netif_msg_tx_err(priv) && net_ratelimit())
> + netdev_err(net_dev, "HW csum error: %d\n", err);
> + return err;
> + }
> +
> + /* Fill in the rest of the FD fields */
> + fd->format = qm_fd_contig;
> + fd->length20 = skb->len;
> + fd->cmd |= FM_FD_CMD_FCO;
> +
> + /* Map the entire buffer size that may be seen by FMan, but no more */
> + addr = dma_map_single(dpa_bp->dev, skbh,
> + skb_end_pointer(skb) - buffer_start, dma_dir);
> + if (unlikely(dma_mapping_error(dpa_bp->dev, addr))) {
> + if (netif_msg_tx_err(priv) && net_ratelimit())
> + netdev_err(net_dev, "dma_map_single() failed\n");
> + return -EINVAL;
> + }
> + fd->addr_hi = (u8)upper_32_bits(addr);
> + fd->addr_lo = lower_32_bits(addr);
> +
> + return 0;
> +}
> +
> +int __hot dpa_tx(struct sk_buff *skb, struct net_device *net_dev)
> +{
> + struct dpa_priv_s *priv;
> + struct qm_fd fd;
> + struct dpa_percpu_priv_s *percpu_priv;
> + struct rtnl_link_stats64 *percpu_stats;
> + const int queue_mapping = dpa_get_queue_mapping(skb);
> + int *countptr, offset = 0;
> +
> + priv = netdev_priv(net_dev);
> + /* Non-migratable context, safe to use raw_cpu_ptr */
> + percpu_priv = raw_cpu_ptr(priv->percpu_priv);
> + percpu_stats = &percpu_priv->stats;
> + countptr = raw_cpu_ptr(priv->dpa_bp->percpu_count);
> +
> + clear_fd(&fd);
> +
> + /* Make sure we have enough headroom to accommodate private
> + * data, parse results, etc. Normally this shouldn't happen if
> + * we're here via the standard kernel stack.
> + */
> + if (unlikely(skb_headroom(skb) < priv->tx_headroom)) {
> + struct sk_buff *skb_new;
> +
> + skb_new = skb_realloc_headroom(skb, priv->tx_headroom);
> + if (unlikely(!skb_new)) {
> + dev_kfree_skb(skb);
> + percpu_stats->tx_errors++;
> + return NETDEV_TX_OK;
> + }
> + dev_kfree_skb(skb);
> + skb = skb_new;
> + }
> +
> + /* We're going to store the skb backpointer at the beginning
> + * of the data buffer, so we need a privately owned skb
> + */
> +
> + /* Code borrowed from skb_unshare(). */
> + if (skb_cloned(skb)) {
> + struct sk_buff *nskb = skb_copy(skb, GFP_ATOMIC);
> +
> + /* Finally, create a contig FD from this skb */
> + skb_to_contig_fd(priv, skb, &fd, countptr, &offset);
> +
> + kfree_skb(skb);
> + skb = nskb;
> + /* skb_copy() has now linearized the skbuff. */
> + }
> +
> + if (unlikely(dpa_xmit(priv, percpu_stats, queue_mapping, &fd) < 0))
> + goto xmit_failed;
> +
> + net_dev->trans_start = jiffies;
> + return NETDEV_TX_OK;
> +
> +xmit_failed:
> + if (fd.cmd & FM_FD_CMD_FCO) {
> + (*countptr)--;
> + dpa_fd_release(net_dev, &fd);
> + percpu_stats->tx_errors++;
> + return NETDEV_TX_OK;
> + }
> + _dpa_cleanup_tx_fd(priv, &fd);
> + percpu_stats->tx_errors++;
> + dev_kfree_skb(skb);
> + return NETDEV_TX_OK;
> +}
> --
> 1.7.11.7
>
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