dpaa_eth.c 72.7 KB
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/* Copyright 2008 - 2016 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_platform.h>
#include <linux/of_mdio.h>
#include <linux/of_net.h>
#include <linux/io.h>
#include <linux/if_arp.h>
#include <linux/if_vlan.h>
#include <linux/icmp.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/udp.h>
#include <linux/tcp.h>
#include <linux/net.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/if_ether.h>
#include <linux/highmem.h>
#include <linux/percpu.h>
#include <linux/dma-mapping.h>
#include <linux/sort.h>
#include <soc/fsl/bman.h>
#include <soc/fsl/qman.h>

#include "fman.h"
#include "fman_port.h"
#include "mac.h"
#include "dpaa_eth.h"

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/* CREATE_TRACE_POINTS only needs to be defined once. Other dpaa files
 * using trace events only need to #include <trace/events/sched.h>
 */
#define CREATE_TRACE_POINTS
#include "dpaa_eth_trace.h"

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static int debug = -1;
module_param(debug, int, 0444);
MODULE_PARM_DESC(debug, "Module/Driver verbosity level (0=none,...,16=all)");

static u16 tx_timeout = 1000;
module_param(tx_timeout, ushort, 0444);
MODULE_PARM_DESC(tx_timeout, "The Tx timeout in ms");

#define FM_FD_STAT_RX_ERRORS						\
	(FM_FD_ERR_DMA | FM_FD_ERR_PHYSICAL	| \
	 FM_FD_ERR_SIZE | FM_FD_ERR_CLS_DISCARD | \
	 FM_FD_ERR_EXTRACTION | FM_FD_ERR_NO_SCHEME	| \
	 FM_FD_ERR_PRS_TIMEOUT | FM_FD_ERR_PRS_ILL_INSTRUCT | \
	 FM_FD_ERR_PRS_HDR_ERR)

#define FM_FD_STAT_TX_ERRORS \
	(FM_FD_ERR_UNSUPPORTED_FORMAT | \
	 FM_FD_ERR_LENGTH | FM_FD_ERR_DMA)

#define DPAA_MSG_DEFAULT (NETIF_MSG_DRV | NETIF_MSG_PROBE | \
			  NETIF_MSG_LINK | NETIF_MSG_IFUP | \
			  NETIF_MSG_IFDOWN)

#define DPAA_INGRESS_CS_THRESHOLD 0x10000000
/* Ingress congestion threshold on FMan ports
 * 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.
 */

/* Size in bytes of the FQ taildrop threshold */
#define DPAA_FQ_TD 0x200000

#define DPAA_CS_THRESHOLD_1G 0x06000000
/* Egress congestion threshold on 1G ports, range 0x1000 .. 0x10000000
 * 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.
 */

#define DPAA_CS_THRESHOLD_10G 0x10000000
/* The size in bytes of the egress Congestion State notification threshold on
 * 10G ports, range 0x1000 .. 0x10000000
 */

/* Largest value that the FQD's OAL field can hold */
#define FSL_QMAN_MAX_OAL	127

/* Default alignment for start of data in an Rx FD */
#define DPAA_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 */
/* L4 Type field: UDP */
#define FM_L4_PARSE_RESULT_UDP	0x40
/* L4 Type field: TCP */
#define FM_L4_PARSE_RESULT_TCP	0x20

#define DPAA_SGT_MAX_ENTRIES 16 /* maximum number of entries in SG Table */
#define DPAA_BUFF_RELEASE_MAX 8 /* maximum number of buffers released at once */

#define FSL_DPAA_BPID_INV		0xff
#define FSL_DPAA_ETH_MAX_BUF_COUNT	128
#define FSL_DPAA_ETH_REFILL_THRESHOLD	80

#define DPAA_TX_PRIV_DATA_SIZE	16
#define DPAA_PARSE_RESULTS_SIZE sizeof(struct fman_prs_result)
#define DPAA_TIME_STAMP_SIZE 8
#define DPAA_HASH_RESULTS_SIZE 8
#define DPAA_RX_PRIV_DATA_SIZE	(u16)(DPAA_TX_PRIV_DATA_SIZE + \
					dpaa_rx_extra_headroom)

#define DPAA_ETH_RX_QUEUES	128

#define DPAA_ENQUEUE_RETRIES	100000

enum port_type {RX, TX};

struct fm_port_fqs {
	struct dpaa_fq *tx_defq;
	struct dpaa_fq *tx_errq;
	struct dpaa_fq *rx_defq;
	struct dpaa_fq *rx_errq;
};

/* All the dpa bps in use at any moment */
static struct dpaa_bp *dpaa_bp_array[BM_MAX_NUM_OF_POOLS];

/* The raw buffer size must be cacheline aligned */
#define DPAA_BP_RAW_SIZE 4096
/* When using more than one buffer pool, the raw sizes are as follows:
 * 1 bp: 4KB
 * 2 bp: 2KB, 4KB
 * 3 bp: 1KB, 2KB, 4KB
 * 4 bp: 1KB, 2KB, 4KB, 8KB
 */
static inline size_t bpool_buffer_raw_size(u8 index, u8 cnt)
{
	size_t res = DPAA_BP_RAW_SIZE / 4;
	u8 i;

	for (i = (cnt < 3) ? cnt : 3; i < 3 + index; i++)
		res *= 2;
	return res;
}

/* 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, so we reserve some more space for start-of-buffer
 * alignment.
 */
#define dpaa_bp_size(raw_size) SKB_WITH_OVERHEAD((raw_size) - SMP_CACHE_BYTES)

static int dpaa_max_frm;

static int dpaa_rx_extra_headroom;

#define dpaa_get_max_mtu()	\
	(dpaa_max_frm - (VLAN_ETH_HLEN + ETH_FCS_LEN))

static int dpaa_netdev_init(struct net_device *net_dev,
			    const struct net_device_ops *dpaa_ops,
			    u16 tx_timeout)
{
	struct dpaa_priv *priv = netdev_priv(net_dev);
	struct device *dev = net_dev->dev.parent;
	struct dpaa_percpu_priv *percpu_priv;
	const u8 *mac_addr;
	int i, err;

	/* Although we access another CPU's private data here
	 * we do it at initialization so it is safe
	 */
	for_each_possible_cpu(i) {
		percpu_priv = per_cpu_ptr(priv->percpu_priv, i);
		percpu_priv->net_dev = net_dev;
	}

	net_dev->netdev_ops = dpaa_ops;
	mac_addr = priv->mac_dev->addr;

	net_dev->mem_start = priv->mac_dev->res->start;
	net_dev->mem_end = priv->mac_dev->res->end;

	net_dev->min_mtu = ETH_MIN_MTU;
	net_dev->max_mtu = dpaa_get_max_mtu();

	net_dev->hw_features |= (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
				 NETIF_F_LLTX);

	net_dev->hw_features |= NETIF_F_SG | NETIF_F_HIGHDMA;
	/* The kernels enables GSO automatically, if we declare NETIF_F_SG.
	 * For conformity, we'll still declare GSO explicitly.
	 */
	net_dev->features |= NETIF_F_GSO;

	net_dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
	/* we do not want shared skbs on TX */
	net_dev->priv_flags &= ~IFF_TX_SKB_SHARING;

	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);

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	net_dev->ethtool_ops = &dpaa_ethtool_ops;

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	net_dev->needed_headroom = priv->tx_headroom;
	net_dev->watchdog_timeo = msecs_to_jiffies(tx_timeout);

	/* start without the RUNNING flag, phylib controls it later */
	netif_carrier_off(net_dev);

	err = register_netdev(net_dev);
	if (err < 0) {
		dev_err(dev, "register_netdev() = %d\n", err);
		return err;
	}

	return 0;
}

static int dpaa_stop(struct net_device *net_dev)
{
	struct mac_device *mac_dev;
	struct dpaa_priv *priv;
	int i, err, error;

	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);

	err = mac_dev->stop(mac_dev);
	if (err < 0)
		netif_err(priv, ifdown, net_dev, "mac_dev->stop() = %d\n",
			  err);

	for (i = 0; i < ARRAY_SIZE(mac_dev->port); i++) {
		error = fman_port_disable(mac_dev->port[i]);
		if (error)
			err = error;
	}

	if (net_dev->phydev)
		phy_disconnect(net_dev->phydev);
	net_dev->phydev = NULL;

	return err;
}

static void dpaa_tx_timeout(struct net_device *net_dev)
{
	struct dpaa_percpu_priv *percpu_priv;
	const struct dpaa_priv	*priv;

	priv = netdev_priv(net_dev);
	percpu_priv = this_cpu_ptr(priv->percpu_priv);

	netif_crit(priv, timer, net_dev, "Transmit timeout latency: %u ms\n",
		   jiffies_to_msecs(jiffies - dev_trans_start(net_dev)));

	percpu_priv->stats.tx_errors++;
}

/* Calculates the statistics for the given device by adding the statistics
 * collected by each CPU.
 */
static struct rtnl_link_stats64 *dpaa_get_stats64(struct net_device *net_dev,
						  struct rtnl_link_stats64 *s)
{
	int numstats = sizeof(struct rtnl_link_stats64) / sizeof(u64);
	struct dpaa_priv *priv = netdev_priv(net_dev);
	struct dpaa_percpu_priv *percpu_priv;
	u64 *netstats = (u64 *)s;
	u64 *cpustats;
	int i, j;

	for_each_possible_cpu(i) {
		percpu_priv = per_cpu_ptr(priv->percpu_priv, i);

		cpustats = (u64 *)&percpu_priv->stats;

		/* add stats from all CPUs */
		for (j = 0; j < numstats; j++)
			netstats[j] += cpustats[j];
	}

	return s;
}

static struct mac_device *dpaa_mac_dev_get(struct platform_device *pdev)
{
	struct platform_device *of_dev;
	struct dpaa_eth_data *eth_data;
	struct device *dpaa_dev, *dev;
	struct device_node *mac_node;
	struct mac_device *mac_dev;

	dpaa_dev = &pdev->dev;
	eth_data = dpaa_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 (!of_dev) {
		dev_err(dpaa_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 (!mac_dev) {
		dev_err(dpaa_dev, "dev_get_drvdata(%s) failed\n",
			dev_name(dev));
		return ERR_PTR(-EINVAL);
	}

	return mac_dev;
}

static int dpaa_set_mac_address(struct net_device *net_dev, void *addr)
{
	const struct dpaa_priv *priv;
	struct mac_device *mac_dev;
	struct sockaddr old_addr;
	int err;

	priv = netdev_priv(net_dev);

	memcpy(old_addr.sa_data, net_dev->dev_addr,  ETH_ALEN);

	err = eth_mac_addr(net_dev, addr);
	if (err < 0) {
		netif_err(priv, drv, net_dev, "eth_mac_addr() = %d\n", err);
		return err;
	}

	mac_dev = priv->mac_dev;

	err = mac_dev->change_addr(mac_dev->fman_mac,
				   (enet_addr_t *)net_dev->dev_addr);
	if (err < 0) {
		netif_err(priv, drv, net_dev, "mac_dev->change_addr() = %d\n",
			  err);
		/* reverting to previous address */
		eth_mac_addr(net_dev, &old_addr);

		return err;
	}

	return 0;
}

static void dpaa_set_rx_mode(struct net_device *net_dev)
{
	const struct dpaa_priv	*priv;
	int err;

	priv = netdev_priv(net_dev);

	if (!!(net_dev->flags & IFF_PROMISC) != priv->mac_dev->promisc) {
		priv->mac_dev->promisc = !priv->mac_dev->promisc;
		err = priv->mac_dev->set_promisc(priv->mac_dev->fman_mac,
						 priv->mac_dev->promisc);
		if (err < 0)
			netif_err(priv, drv, net_dev,
				  "mac_dev->set_promisc() = %d\n",
				  err);
	}

	err = priv->mac_dev->set_multi(net_dev, priv->mac_dev);
	if (err < 0)
		netif_err(priv, drv, net_dev, "mac_dev->set_multi() = %d\n",
			  err);
}

static struct dpaa_bp *dpaa_bpid2pool(int bpid)
{
	if (WARN_ON(bpid < 0 || bpid >= BM_MAX_NUM_OF_POOLS))
		return NULL;

	return dpaa_bp_array[bpid];
}

/* checks if this bpool is already allocated */
static bool dpaa_bpid2pool_use(int bpid)
{
	if (dpaa_bpid2pool(bpid)) {
		atomic_inc(&dpaa_bp_array[bpid]->refs);
		return true;
	}

	return false;
}

/* called only once per bpid by dpaa_bp_alloc_pool() */
static void dpaa_bpid2pool_map(int bpid, struct dpaa_bp *dpaa_bp)
{
	dpaa_bp_array[bpid] = dpaa_bp;
	atomic_set(&dpaa_bp->refs, 1);
}

static int dpaa_bp_alloc_pool(struct dpaa_bp *dpaa_bp)
{
	int err;

	if (dpaa_bp->size == 0 || dpaa_bp->config_count == 0) {
		pr_err("%s: Buffer pool is not properly initialized! Missing size or initial number of buffers\n",
		       __func__);
		return -EINVAL;
	}

	/* If the pool is already specified, we only create one per bpid */
	if (dpaa_bp->bpid != FSL_DPAA_BPID_INV &&
	    dpaa_bpid2pool_use(dpaa_bp->bpid))
		return 0;

	if (dpaa_bp->bpid == FSL_DPAA_BPID_INV) {
		dpaa_bp->pool = bman_new_pool();
		if (!dpaa_bp->pool) {
			pr_err("%s: bman_new_pool() failed\n",
			       __func__);
			return -ENODEV;
		}

		dpaa_bp->bpid = (u8)bman_get_bpid(dpaa_bp->pool);
	}

	if (dpaa_bp->seed_cb) {
		err = dpaa_bp->seed_cb(dpaa_bp);
		if (err)
			goto pool_seed_failed;
	}

	dpaa_bpid2pool_map(dpaa_bp->bpid, dpaa_bp);

	return 0;

pool_seed_failed:
	pr_err("%s: pool seeding failed\n", __func__);
	bman_free_pool(dpaa_bp->pool);

	return err;
}

/* remove and free all the buffers from the given buffer pool */
static void dpaa_bp_drain(struct dpaa_bp *bp)
{
	u8 num = 8;
	int ret;

	do {
		struct bm_buffer bmb[8];
		int i;

		ret = bman_acquire(bp->pool, bmb, num);
		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;
			}
		}

		if (bp->free_buf_cb)
			for (i = 0; i < num; i++)
				bp->free_buf_cb(bp, &bmb[i]);
	} while (ret > 0);
}

static void dpaa_bp_free(struct dpaa_bp *dpaa_bp)
{
	struct dpaa_bp *bp = dpaa_bpid2pool(dpaa_bp->bpid);

	/* the mapping between bpid and dpaa_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)
		dpaa_bp_drain(bp);

	dpaa_bp_array[bp->bpid] = NULL;
	bman_free_pool(bp->pool);
}

static void dpaa_bps_free(struct dpaa_priv *priv)
{
	int i;

	for (i = 0; i < DPAA_BPS_NUM; i++)
		dpaa_bp_free(priv->dpaa_bps[i]);
}

/* Use multiple WQs for FQ assignment:
 *	- Tx Confirmation queues go to WQ1.
 *	- 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).
 *	- Rx Default and Tx queues go to WQ3 (no differentiation between
 *	  Rx and Tx traffic).
 * 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 dpaa_assign_wq(struct dpaa_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_ERROR:
	case FQ_TYPE_TX_ERROR:
		fq->wq = 2;
		break;
	case FQ_TYPE_RX_DEFAULT:
	case FQ_TYPE_TX:
		fq->wq = 3;
		break;
	default:
		WARN(1, "Invalid FQ type %d for FQID %d!\n",
		     fq->fq_type, fq->fqid);
	}
}

static struct dpaa_fq *dpaa_fq_alloc(struct device *dev,
				     u32 start, u32 count,
				     struct list_head *list,
				     enum dpaa_fq_type fq_type)
{
	struct dpaa_fq *dpaa_fq;
	int i;

	dpaa_fq = devm_kzalloc(dev, sizeof(*dpaa_fq) * count,
			       GFP_KERNEL);
	if (!dpaa_fq)
		return NULL;

	for (i = 0; i < count; i++) {
		dpaa_fq[i].fq_type = fq_type;
		dpaa_fq[i].fqid = start ? start + i : 0;
		list_add_tail(&dpaa_fq[i].list, list);
	}

	for (i = 0; i < count; i++)
		dpaa_assign_wq(dpaa_fq + i);

	return dpaa_fq;
}

static int dpaa_alloc_all_fqs(struct device *dev, struct list_head *list,
			      struct fm_port_fqs *port_fqs)
{
	struct dpaa_fq *dpaa_fq;

	dpaa_fq = dpaa_fq_alloc(dev, 0, 1, list, FQ_TYPE_RX_ERROR);
	if (!dpaa_fq)
		goto fq_alloc_failed;

	port_fqs->rx_errq = &dpaa_fq[0];

	dpaa_fq = dpaa_fq_alloc(dev, 0, 1, list, FQ_TYPE_RX_DEFAULT);
	if (!dpaa_fq)
		goto fq_alloc_failed;

	port_fqs->rx_defq = &dpaa_fq[0];

	if (!dpaa_fq_alloc(dev, 0, DPAA_ETH_TXQ_NUM, list, FQ_TYPE_TX_CONF_MQ))
		goto fq_alloc_failed;

	dpaa_fq = dpaa_fq_alloc(dev, 0, 1, list, FQ_TYPE_TX_ERROR);
	if (!dpaa_fq)
		goto fq_alloc_failed;

	port_fqs->tx_errq = &dpaa_fq[0];

	dpaa_fq = dpaa_fq_alloc(dev, 0, 1, list, FQ_TYPE_TX_CONFIRM);
	if (!dpaa_fq)
		goto fq_alloc_failed;

	port_fqs->tx_defq = &dpaa_fq[0];

	if (!dpaa_fq_alloc(dev, 0, DPAA_ETH_TXQ_NUM, list, FQ_TYPE_TX))
		goto fq_alloc_failed;

	return 0;

fq_alloc_failed:
	dev_err(dev, "dpaa_fq_alloc() failed\n");
	return -ENOMEM;
}

static u32 rx_pool_channel;
static DEFINE_SPINLOCK(rx_pool_channel_init);

static int dpaa_get_channel(void)
{
	spin_lock(&rx_pool_channel_init);
	if (!rx_pool_channel) {
		u32 pool;
		int ret;

		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;
}

static void dpaa_release_channel(void)
{
	qman_release_pool(rx_pool_channel);
}

static void dpaa_eth_add_channel(u16 channel)
{
	u32 pool = QM_SDQCR_CHANNELS_POOL_CONV(channel);
	const cpumask_t *cpus = qman_affine_cpus();
	struct qman_portal *portal;
	int cpu;

	for_each_cpu(cpu, cpus) {
		portal = qman_get_affine_portal(cpu);
		qman_p_static_dequeue_add(portal, pool);
	}
}

/* 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 dpaa_priv *priv = (struct dpaa_priv *)container_of(cgr,
		struct dpaa_priv, cgr_data.cgr);

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	if (congested) {
		priv->cgr_data.congestion_start_jiffies = jiffies;
711
		netif_tx_stop_all_queues(priv->net_dev);
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		priv->cgr_data.cgr_congested_count++;
	} else {
		priv->cgr_data.congested_jiffies +=
			(jiffies - priv->cgr_data.congestion_start_jiffies);
716
		netif_tx_wake_all_queues(priv->net_dev);
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	}
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}

static int dpaa_eth_cgr_init(struct dpaa_priv *priv)
{
	struct qm_mcc_initcgr initcgr;
	u32 cs_th;
	int err;

	err = qman_alloc_cgrid(&priv->cgr_data.cgr.cgrid);
	if (err < 0) {
		if (netif_msg_drv(priv))
			pr_err("%s: Error %d allocating CGR ID\n",
			       __func__, err);
		goto out_error;
	}
	priv->cgr_data.cgr.cb = dpaa_eth_cgscn;

	/* Enable Congestion State Change Notifications and CS taildrop */
736
	initcgr.we_mask = cpu_to_be16(QM_CGR_WE_CSCN_EN | QM_CGR_WE_CS_THRES);
737 738 739 740 741 742 743 744 745 746 747 748 749
	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 = DPAA_CS_THRESHOLD_10G;
	else
		cs_th = DPAA_CS_THRESHOLD_1G;
	qm_cgr_cs_thres_set64(&initcgr.cgr.cs_thres, cs_th, 1);

750
	initcgr.we_mask |= cpu_to_be16(QM_CGR_WE_CSTD_EN);
751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898
	initcgr.cgr.cstd_en = QM_CGR_EN;

	err = qman_create_cgr(&priv->cgr_data.cgr, QMAN_CGR_FLAG_USE_INIT,
			      &initcgr);
	if (err < 0) {
		if (netif_msg_drv(priv))
			pr_err("%s: Error %d creating CGR with ID %d\n",
			       __func__, err, priv->cgr_data.cgr.cgrid);
		qman_release_cgrid(priv->cgr_data.cgr.cgrid);
		goto out_error;
	}
	if (netif_msg_drv(priv))
		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;
}

static inline void dpaa_setup_ingress(const struct dpaa_priv *priv,
				      struct dpaa_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 dpaa_setup_egress(const struct dpaa_priv *priv,
				     struct dpaa_fq *fq,
				     struct fman_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)fman_port_get_qman_channel_id(port);
	} else {
		fq->flags = QMAN_FQ_FLAG_NO_MODIFY;
	}
}

static void dpaa_fq_setup(struct dpaa_priv *priv,
			  const struct dpaa_fq_cbs *fq_cbs,
			  struct fman_port *tx_port)
{
	int egress_cnt = 0, conf_cnt = 0, num_portals = 0, cpu;
	const cpumask_t *affine_cpus = qman_affine_cpus();
	u16 portals[NR_CPUS];
	struct dpaa_fq *fq;

	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->dpaa_fq_list, list) {
		switch (fq->fq_type) {
		case FQ_TYPE_RX_DEFAULT:
			dpaa_setup_ingress(priv, fq, &fq_cbs->rx_defq);
			break;
		case FQ_TYPE_RX_ERROR:
			dpaa_setup_ingress(priv, fq, &fq_cbs->rx_errq);
			break;
		case FQ_TYPE_TX:
			dpaa_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_TXQ_NUM)
				priv->egress_fqs[egress_cnt++] = &fq->fq_base;
			break;
		case FQ_TYPE_TX_CONF_MQ:
			priv->conf_fqs[conf_cnt++] = &fq->fq_base;
			/* fall through */
		case FQ_TYPE_TX_CONFIRM:
			dpaa_setup_ingress(priv, fq, &fq_cbs->tx_defq);
			break;
		case FQ_TYPE_TX_ERROR:
			dpaa_setup_ingress(priv, fq, &fq_cbs->tx_errq);
			break;
		default:
			dev_warn(priv->net_dev->dev.parent,
				 "Unknown FQ type detected!\n");
			break;
		}
	}

	 /* Make sure all CPUs receive a corresponding Tx queue. */
	while (egress_cnt < DPAA_ETH_TXQ_NUM) {
		list_for_each_entry(fq, &priv->dpaa_fq_list, list) {
			if (fq->fq_type != FQ_TYPE_TX)
				continue;
			priv->egress_fqs[egress_cnt++] = &fq->fq_base;
			if (egress_cnt == DPAA_ETH_TXQ_NUM)
				break;
		}
	}
}

static inline int dpaa_tx_fq_to_id(const struct dpaa_priv *priv,
				   struct qman_fq *tx_fq)
{
	int i;

	for (i = 0; i < DPAA_ETH_TXQ_NUM; i++)
		if (priv->egress_fqs[i] == tx_fq)
			return i;

	return -EINVAL;
}

static int dpaa_fq_init(struct dpaa_fq *dpaa_fq, bool td_enable)
{
	const struct dpaa_priv	*priv;
	struct qman_fq *confq = NULL;
	struct qm_mcc_initfq initfq;
	struct device *dev;
	struct qman_fq *fq;
	int queue_id;
	int err;

	priv = netdev_priv(dpaa_fq->net_dev);
	dev = dpaa_fq->net_dev->dev.parent;

	if (dpaa_fq->fqid == 0)
		dpaa_fq->flags |= QMAN_FQ_FLAG_DYNAMIC_FQID;

	dpaa_fq->init = !(dpaa_fq->flags & QMAN_FQ_FLAG_NO_MODIFY);

	err = qman_create_fq(dpaa_fq->fqid, dpaa_fq->flags, &dpaa_fq->fq_base);
	if (err) {
		dev_err(dev, "qman_create_fq() failed\n");
		return err;
	}
	fq = &dpaa_fq->fq_base;

	if (dpaa_fq->init) {
		memset(&initfq, 0, sizeof(initfq));

899
		initfq.we_mask = cpu_to_be16(QM_INITFQ_WE_FQCTRL);
900
		/* Note: we may get to keep an empty FQ in cache */
901
		initfq.fqd.fq_ctrl = cpu_to_be16(QM_FQCTRL_PREFERINCACHE);
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		/* Try to reduce the number of portal interrupts for
		 * Tx Confirmation FQs.
		 */
		if (dpaa_fq->fq_type == FQ_TYPE_TX_CONFIRM)
907
			initfq.fqd.fq_ctrl |= cpu_to_be16(QM_FQCTRL_HOLDACTIVE);
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		/* FQ placement */
910
		initfq.we_mask |= cpu_to_be16(QM_INITFQ_WE_DESTWQ);
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		qm_fqd_set_destwq(&initfq.fqd, dpaa_fq->channel, dpaa_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 (dpaa_fq->fq_type == FQ_TYPE_TX ||
		    dpaa_fq->fq_type == FQ_TYPE_TX_CONFIRM ||
		    dpaa_fq->fq_type == FQ_TYPE_TX_CONF_MQ) {
923 924
			initfq.we_mask |= cpu_to_be16(QM_INITFQ_WE_CGID);
			initfq.fqd.fq_ctrl |= cpu_to_be16(QM_FQCTRL_CGE);
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			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.
			 */
935
			initfq.we_mask |= cpu_to_be16(QM_INITFQ_WE_OAC);
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			qm_fqd_set_oac(&initfq.fqd, QM_OAC_CG);
			qm_fqd_set_oal(&initfq.fqd,
				       min(sizeof(struct sk_buff) +
				       priv->tx_headroom,
				       (size_t)FSL_QMAN_MAX_OAL));
		}

		if (td_enable) {
944
			initfq.we_mask |= cpu_to_be16(QM_INITFQ_WE_TDTHRESH);
945
			qm_fqd_set_taildrop(&initfq.fqd, DPAA_FQ_TD, 1);
946
			initfq.fqd.fq_ctrl = cpu_to_be16(QM_FQCTRL_TDE);
947 948 949 950 951 952 953
		}

		if (dpaa_fq->fq_type == FQ_TYPE_TX) {
			queue_id = dpaa_tx_fq_to_id(priv, &dpaa_fq->fq_base);
			if (queue_id >= 0)
				confq = priv->conf_fqs[queue_id];
			if (confq) {
954 955
				initfq.we_mask |=
					cpu_to_be16(QM_INITFQ_WE_CONTEXTA);
956 957 958 959 960 961 962
			/* ContextA: OVOM=1(use contextA2 bits instead of ICAD)
			 *	     A2V=1 (contextA A2 field is valid)
			 *	     A0V=1 (contextA A0 field is valid)
			 *	     B0V=1 (contextB field is valid)
			 * ContextA A2: EBD=1 (deallocate buffers inside FMan)
			 * ContextB B0(ASPID): 0 (absolute Virtual Storage ID)
			 */
963 964
				qm_fqd_context_a_set64(&initfq.fqd,
						       0x1e00000080000000ULL);
965 966 967 968 969 970 971
			}
		}

		/* Put all the ingress queues in our "ingress CGR". */
		if (priv->use_ingress_cgr &&
		    (dpaa_fq->fq_type == FQ_TYPE_RX_DEFAULT ||
		     dpaa_fq->fq_type == FQ_TYPE_RX_ERROR)) {
972 973
			initfq.we_mask |= cpu_to_be16(QM_INITFQ_WE_CGID);
			initfq.fqd.fq_ctrl |= cpu_to_be16(QM_FQCTRL_CGE);
974 975 976 977
			initfq.fqd.cgid = (u8)priv->ingress_cgr.cgrid;
			/* Set a fixed overhead accounting, just like for the
			 * egress CGR.
			 */
978
			initfq.we_mask |= cpu_to_be16(QM_INITFQ_WE_OAC);
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			qm_fqd_set_oac(&initfq.fqd, QM_OAC_CG);
			qm_fqd_set_oal(&initfq.fqd,
				       min(sizeof(struct sk_buff) +
				       priv->tx_headroom,
				       (size_t)FSL_QMAN_MAX_OAL));
		}

		/* Initialization common to all ingress queues */
		if (dpaa_fq->flags & QMAN_FQ_FLAG_NO_ENQUEUE) {
988 989
			initfq.we_mask |= cpu_to_be16(QM_INITFQ_WE_CONTEXTA);
			initfq.fqd.fq_ctrl |= cpu_to_be16(QM_FQCTRL_HOLDACTIVE);
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			initfq.fqd.context_a.stashing.exclusive =
				QM_STASHING_EXCL_DATA | QM_STASHING_EXCL_CTX |
				QM_STASHING_EXCL_ANNOTATION;
			qm_fqd_set_stashing(&initfq.fqd, 1, 2,
					    DIV_ROUND_UP(sizeof(struct qman_fq),
							 64));
		}

		err = qman_init_fq(fq, QMAN_INITFQ_FLAG_SCHED, &initfq);
		if (err < 0) {
			dev_err(dev, "qman_init_fq(%u) = %d\n",
				qman_fq_fqid(fq), err);
			qman_destroy_fq(fq);
			return err;
		}
	}

	dpaa_fq->fqid = qman_fq_fqid(fq);

	return 0;
}

static int dpaa_fq_free_entry(struct device *dev, struct qman_fq *fq)
{
	const struct dpaa_priv  *priv;
	struct dpaa_fq *dpaa_fq;
	int err, error;

	err = 0;

	dpaa_fq = container_of(fq, struct dpaa_fq, fq_base);
	priv = netdev_priv(dpaa_fq->net_dev);

	if (dpaa_fq->init) {
		err = qman_retire_fq(fq, NULL);
		if (err < 0 && netif_msg_drv(priv))
			dev_err(dev, "qman_retire_fq(%u) = %d\n",
				qman_fq_fqid(fq), err);

		error = qman_oos_fq(fq);
		if (error < 0 && netif_msg_drv(priv)) {
			dev_err(dev, "qman_oos_fq(%u) = %d\n",
				qman_fq_fqid(fq), error);
			if (err >= 0)
				err = error;
		}
	}

	qman_destroy_fq(fq);
	list_del(&dpaa_fq->list);

	return err;
}

static int dpaa_fq_free(struct device *dev, struct list_head *list)
{
	struct dpaa_fq *dpaa_fq, *tmp;
	int err, error;

	err = 0;
	list_for_each_entry_safe(dpaa_fq, tmp, list, list) {
		error = dpaa_fq_free_entry(dev, (struct qman_fq *)dpaa_fq);
		if (error < 0 && err >= 0)
			err = error;
	}

	return err;
}

static void dpaa_eth_init_tx_port(struct fman_port *port, struct dpaa_fq *errq,
				  struct dpaa_fq *defq,
				  struct dpaa_buffer_layout *buf_layout)
{
	struct fman_buffer_prefix_content buf_prefix_content;
	struct fman_port_params params;
	int err;

	memset(&params, 0, sizeof(params));
	memset(&buf_prefix_content, 0, sizeof(buf_prefix_content));

	buf_prefix_content.priv_data_size = buf_layout->priv_data_size;
	buf_prefix_content.pass_prs_result = true;
	buf_prefix_content.pass_hash_result = true;
	buf_prefix_content.pass_time_stamp = false;
	buf_prefix_content.data_align = DPAA_FD_DATA_ALIGNMENT;

	params.specific_params.non_rx_params.err_fqid = errq->fqid;
	params.specific_params.non_rx_params.dflt_fqid = defq->fqid;

	err = fman_port_config(port, &params);
	if (err)
		pr_err("%s: fman_port_config failed\n", __func__);

	err = fman_port_cfg_buf_prefix_content(port, &buf_prefix_content);
	if (err)
		pr_err("%s: fman_port_cfg_buf_prefix_content failed\n",
		       __func__);

	err = fman_port_init(port);
	if (err)
		pr_err("%s: fm_port_init failed\n", __func__);
}

static void dpaa_eth_init_rx_port(struct fman_port *port, struct dpaa_bp **bps,
				  size_t count, struct dpaa_fq *errq,
				  struct dpaa_fq *defq,
				  struct dpaa_buffer_layout *buf_layout)
{
	struct fman_buffer_prefix_content buf_prefix_content;
	struct fman_port_rx_params *rx_p;
	struct fman_port_params params;
	int i, err;

	memset(&params, 0, sizeof(params));
	memset(&buf_prefix_content, 0, sizeof(buf_prefix_content));

	buf_prefix_content.priv_data_size = buf_layout->priv_data_size;
	buf_prefix_content.pass_prs_result = true;
	buf_prefix_content.pass_hash_result = true;
	buf_prefix_content.pass_time_stamp = false;
	buf_prefix_content.data_align = DPAA_FD_DATA_ALIGNMENT;

	rx_p = &params.specific_params.rx_params;
	rx_p->err_fqid = errq->fqid;
	rx_p->dflt_fqid = defq->fqid;

	count = min(ARRAY_SIZE(rx_p->ext_buf_pools.ext_buf_pool), count);
	rx_p->ext_buf_pools.num_of_pools_used = (u8)count;
	for (i = 0; i < count; i++) {
		rx_p->ext_buf_pools.ext_buf_pool[i].id =  bps[i]->bpid;
		rx_p->ext_buf_pools.ext_buf_pool[i].size = (u16)bps[i]->size;
	}

	err = fman_port_config(port, &params);
	if (err)
		pr_err("%s: fman_port_config failed\n", __func__);

	err = fman_port_cfg_buf_prefix_content(port, &buf_prefix_content);
	if (err)
		pr_err("%s: fman_port_cfg_buf_prefix_content failed\n",
		       __func__);

	err = fman_port_init(port);
	if (err)
		pr_err("%s: fm_port_init failed\n", __func__);
}

static void dpaa_eth_init_ports(struct mac_device *mac_dev,
				struct dpaa_bp **bps, size_t count,
				struct fm_port_fqs *port_fqs,
				struct dpaa_buffer_layout *buf_layout,
				struct device *dev)
{
	struct fman_port *rxport = mac_dev->port[RX];
	struct fman_port *txport = mac_dev->port[TX];

	dpaa_eth_init_tx_port(txport, port_fqs->tx_errq,
			      port_fqs->tx_defq, &buf_layout[TX]);
	dpaa_eth_init_rx_port(rxport, bps, count, port_fqs->rx_errq,
			      port_fqs->rx_defq, &buf_layout[RX]);
}

static int dpaa_bman_release(const struct dpaa_bp *dpaa_bp,
			     struct bm_buffer *bmb, int cnt)
{
	int err;

	err = bman_release(dpaa_bp->pool, bmb, cnt);
	/* Should never occur, address anyway to avoid leaking the buffers */
	if (unlikely(WARN_ON(err)) && dpaa_bp->free_buf_cb)
		while (cnt-- > 0)
			dpaa_bp->free_buf_cb(dpaa_bp, &bmb[cnt]);

	return cnt;
}

static void dpaa_release_sgt_members(struct qm_sg_entry *sgt)
{
	struct bm_buffer bmb[DPAA_BUFF_RELEASE_MAX];
	struct dpaa_bp *dpaa_bp;
	int i = 0, j;

	memset(bmb, 0, sizeof(bmb));

	do {
		dpaa_bp = dpaa_bpid2pool(sgt[i].bpid);
		if (!dpaa_bp)
			return;

		j = 0;
		do {
			WARN_ON(qm_sg_entry_is_ext(&sgt[i]));

			bm_buffer_set64(&bmb[j], qm_sg_entry_get64(&sgt[i]));

			j++; i++;
		} while (j < ARRAY_SIZE(bmb) &&
				!qm_sg_entry_is_final(&sgt[i - 1]) &&
				sgt[i - 1].bpid == sgt[i].bpid);

		dpaa_bman_release(dpaa_bp, bmb, j);
	} while (!qm_sg_entry_is_final(&sgt[i - 1]));
}

static void dpaa_fd_release(const struct net_device *net_dev,
			    const struct qm_fd *fd)
{
	struct qm_sg_entry *sgt;
	struct dpaa_bp *dpaa_bp;
	struct bm_buffer bmb;
	dma_addr_t addr;
	void *vaddr;

	bmb.data = 0;
	bm_buffer_set64(&bmb, qm_fd_addr(fd));

	dpaa_bp = dpaa_bpid2pool(fd->bpid);
	if (!dpaa_bp)
		return;

	if (qm_fd_get_format(fd) == qm_fd_sg) {
		vaddr = phys_to_virt(qm_fd_addr(fd));
		sgt = vaddr + qm_fd_get_offset(fd);

		dma_unmap_single(dpaa_bp->dev, qm_fd_addr(fd), dpaa_bp->size,
				 DMA_FROM_DEVICE);

		dpaa_release_sgt_members(sgt);

		addr = dma_map_single(dpaa_bp->dev, vaddr, dpaa_bp->size,
				      DMA_FROM_DEVICE);
		if (dma_mapping_error(dpaa_bp->dev, addr)) {
			dev_err(dpaa_bp->dev, "DMA mapping failed");
			return;
		}
		bm_buffer_set64(&bmb, addr);
	}

	dpaa_bman_release(dpaa_bp, &bmb, 1);
}

M
Madalin Bucur 已提交
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static void count_ern(struct dpaa_percpu_priv *percpu_priv,
		      const union qm_mr_entry *msg)
{
	switch (msg->ern.rc & QM_MR_RC_MASK) {
	case QM_MR_RC_CGR_TAILDROP:
		percpu_priv->ern_cnt.cg_tdrop++;
		break;
	case QM_MR_RC_WRED:
		percpu_priv->ern_cnt.wred++;
		break;
	case QM_MR_RC_ERROR:
		percpu_priv->ern_cnt.err_cond++;
		break;
	case QM_MR_RC_ORPWINDOW_EARLY:
		percpu_priv->ern_cnt.early_window++;
		break;
	case QM_MR_RC_ORPWINDOW_LATE:
		percpu_priv->ern_cnt.late_window++;
		break;
	case QM_MR_RC_FQ_TAILDROP:
		percpu_priv->ern_cnt.fq_tdrop++;
		break;
	case QM_MR_RC_ORPWINDOW_RETIRED:
		percpu_priv->ern_cnt.fq_retired++;
		break;
	case QM_MR_RC_ORP_ZERO:
		percpu_priv->ern_cnt.orp_zero++;
		break;
	}
}

1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352
/* 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).
 */
static int dpaa_enable_tx_csum(struct dpaa_priv *priv,
			       struct sk_buff *skb,
			       struct qm_fd *fd,
			       char *parse_results)
{
	struct fman_prs_result *parse_result;
	u16 ethertype = ntohs(skb->protocol);
	struct ipv6hdr *ipv6h = NULL;
	struct iphdr *iph;
	int retval = 0;
	u8 l4_proto;

	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 = (struct fman_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 = cpu_to_be16(FM_L3_PARSE_RESULT_IPV4);
		iph = ip_hdr(skb);
		WARN_ON(!iph);
		l4_proto = iph->protocol;
		break;
	case ETH_P_IPV6:
		parse_result->l3r = cpu_to_be16(FM_L3_PARSE_RESULT_IPV6);
		ipv6h = ipv6_hdr(skb);
		WARN_ON(!ipv6h);
		l4_proto = ipv6h->nexthdr;
		break;
	default:
		/* We shouldn't even be here */
		if (net_ratelimit())
			netif_alert(priv, tx_err, 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:
		if (net_ratelimit())
			netif_alert(priv, tx_err, 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. */
1353
	fd->cmd |= cpu_to_be32(FM_FD_CMD_RPD | FM_FD_CMD_DTC);
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	/* 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;
}

static int dpaa_bp_add_8_bufs(const struct dpaa_bp *dpaa_bp)
{
	struct device *dev = dpaa_bp->dev;
	struct bm_buffer bmb[8];
	dma_addr_t addr;
	void *new_buf;
	u8 i;

	for (i = 0; i < 8; i++) {
		new_buf = netdev_alloc_frag(dpaa_bp->raw_size);
		if (unlikely(!new_buf)) {
			dev_err(dev, "netdev_alloc_frag() failed, size %zu\n",
				dpaa_bp->raw_size);
			goto release_previous_buffs;
		}
		new_buf = PTR_ALIGN(new_buf, SMP_CACHE_BYTES);

		addr = dma_map_single(dev, new_buf,
				      dpaa_bp->size, DMA_FROM_DEVICE);
		if (unlikely(dma_mapping_error(dev, addr))) {
			dev_err(dpaa_bp->dev, "DMA map failed");
			goto release_previous_buffs;
		}

		bmb[i].data = 0;
		bm_buffer_set64(&bmb[i], addr);
	}

release_bufs:
	return dpaa_bman_release(dpaa_bp, bmb, i);

release_previous_buffs:
	WARN_ONCE(1, "dpaa_eth: failed to add buffers 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;
}

static int dpaa_bp_seed(struct dpaa_bp *dpaa_bp)
{
	int i;

	/* Give each CPU an allotment of "config_count" buffers */
	for_each_possible_cpu(i) {
		int *count_ptr = per_cpu_ptr(dpaa_bp->percpu_count, 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 < dpaa_bp->config_count; j += 8)
			*count_ptr += dpaa_bp_add_8_bufs(dpaa_bp);
	}
	return 0;
}

/* Add buffers/(pages) for Rx processing whenever bpool count falls below
 * REFILL_THRESHOLD.
 */
static int dpaa_eth_refill_bpool(struct dpaa_bp *dpaa_bp, int *countptr)
{
	int count = *countptr;
	int new_bufs;

	if (unlikely(count < FSL_DPAA_ETH_REFILL_THRESHOLD)) {
		do {
			new_bufs = dpaa_bp_add_8_bufs(dpaa_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;
}

static int dpaa_eth_refill_bpools(struct dpaa_priv *priv)
{
	struct dpaa_bp *dpaa_bp;
	int *countptr;
	int res, i;

	for (i = 0; i < DPAA_BPS_NUM; i++) {
		dpaa_bp = priv->dpaa_bps[i];
		if (!dpaa_bp)
			return -EINVAL;
		countptr = this_cpu_ptr(dpaa_bp->percpu_count);
		res  = dpaa_eth_refill_bpool(dpaa_bp, countptr);
		if (res)
			return res;
	}
	return 0;
}

/* 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.
 */
static struct sk_buff *dpaa_cleanup_tx_fd(const struct dpaa_priv *priv,
					  const struct qm_fd *fd)
{
	const enum dma_data_direction dma_dir = DMA_TO_DEVICE;
	struct device *dev = priv->net_dev->dev.parent;
	dma_addr_t addr = qm_fd_addr(fd);
	const struct qm_sg_entry *sgt;
	struct sk_buff **skbh, *skb;
	int nr_frags, i;

	skbh = (struct sk_buff **)phys_to_virt(addr);
	skb = *skbh;

	if (unlikely(qm_fd_get_format(fd) == qm_fd_sg)) {
		nr_frags = skb_shinfo(skb)->nr_frags;
		dma_unmap_single(dev, addr, qm_fd_get_offset(fd) +
				 sizeof(struct qm_sg_entry) * (1 + nr_frags),
				 dma_dir);

		/* The sgt buffer has been allocated with netdev_alloc_frag(),
		 * it's from lowmem.
		 */
		sgt = phys_to_virt(addr + qm_fd_get_offset(fd));

		/* sgt[0] is from lowmem, was dma_map_single()-ed */
		dma_unmap_single(dev, qm_sg_addr(&sgt[0]),
				 qm_sg_entry_get_len(&sgt[0]), dma_dir);

		/* remaining pages were mapped with skb_frag_dma_map() */
		for (i = 1; i < nr_frags; i++) {
			WARN_ON(qm_sg_entry_is_ext(&sgt[i]));

			dma_unmap_page(dev, qm_sg_addr(&sgt[i]),
				       qm_sg_entry_get_len(&sgt[i]), dma_dir);
		}

		/* Free the page frag that we allocated on Tx */
		skb_free_frag(phys_to_virt(addr));
	} else {
		dma_unmap_single(dev, addr,
				 skb_tail_pointer(skb) - (u8 *)skbh, dma_dir);
	}

	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 *contig_fd_to_skb(const struct dpaa_priv *priv,
					const struct qm_fd *fd)
{
	ssize_t fd_off = qm_fd_get_offset(fd);
	dma_addr_t addr = qm_fd_addr(fd);
	struct dpaa_bp *dpaa_bp;
	struct sk_buff *skb;
	void *vaddr;

	vaddr = phys_to_virt(addr);
	WARN_ON(!IS_ALIGNED((unsigned long)vaddr, SMP_CACHE_BYTES));

	dpaa_bp = dpaa_bpid2pool(fd->bpid);
	if (!dpaa_bp)
		goto free_buffer;

	skb = build_skb(vaddr, dpaa_bp->size +
			SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
	if (unlikely(!skb)) {
		WARN_ONCE(1, "Build skb failure on Rx\n");
		goto free_buffer;
	}
	WARN_ON(fd_off != priv->rx_headroom);
	skb_reserve(skb, fd_off);
	skb_put(skb, qm_fd_get_length(fd));

	skb->ip_summed = CHECKSUM_NONE;

	return skb;

free_buffer:
	skb_free_frag(vaddr);
	return NULL;
}

/* Build an skb with the data of the first S/G entry in the linear portion and
 * the rest of the frame as skb fragments.
 *
 * The page fragment holding the S/G Table is recycled here.
 */
static struct sk_buff *sg_fd_to_skb(const struct dpaa_priv *priv,
				    const struct qm_fd *fd)
{
	ssize_t fd_off = qm_fd_get_offset(fd);
	dma_addr_t addr = qm_fd_addr(fd);
	const struct qm_sg_entry *sgt;
	struct page *page, *head_page;
	struct dpaa_bp *dpaa_bp;
	void *vaddr, *sg_vaddr;
	int frag_off, frag_len;
	struct sk_buff *skb;
	dma_addr_t sg_addr;
	int page_offset;
	unsigned int sz;
	int *count_ptr;
	int i;

	vaddr = phys_to_virt(addr);
	WARN_ON(!IS_ALIGNED((unsigned long)vaddr, SMP_CACHE_BYTES));

	/* Iterate through the SGT entries and add data buffers to the skb */
	sgt = vaddr + fd_off;
	for (i = 0; i < DPAA_SGT_MAX_ENTRIES; i++) {
		/* Extension bit is not supported */
		WARN_ON(qm_sg_entry_is_ext(&sgt[i]));

		sg_addr = qm_sg_addr(&sgt[i]);
		sg_vaddr = phys_to_virt(sg_addr);
		WARN_ON(!IS_ALIGNED((unsigned long)sg_vaddr,
				    SMP_CACHE_BYTES));

		/* We may use multiple Rx pools */
		dpaa_bp = dpaa_bpid2pool(sgt[i].bpid);
		if (!dpaa_bp)
			goto free_buffers;

		count_ptr = this_cpu_ptr(dpaa_bp->percpu_count);
		dma_unmap_single(dpaa_bp->dev, sg_addr, dpaa_bp->size,
				 DMA_FROM_DEVICE);
		if (i == 0) {
			sz = dpaa_bp->size +
				SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
			skb = build_skb(sg_vaddr, sz);
			if (WARN_ON(unlikely(!skb)))
				goto free_buffers;

			skb->ip_summed = CHECKSUM_NONE;

			/* Make sure forwarded skbs will have enough space
			 * on Tx, if extra headers are added.
			 */
			WARN_ON(fd_off != priv->rx_headroom);
			skb_reserve(skb, fd_off);
			skb_put(skb, qm_sg_entry_get_len(&sgt[i]));
		} else {
			/* Not the first S/G entry; all data from buffer will
			 * be added in an skb fragment; fragment index is offset
			 * by one since first S/G entry was incorporated in the
			 * linear part of the skb.
			 *
			 * Caution: 'page' may be a tail page.
			 */
			page = virt_to_page(sg_vaddr);
			head_page = virt_to_head_page(sg_vaddr);

			/* Compute offset in (possibly tail) page */
			page_offset = ((unsigned long)sg_vaddr &
					(PAGE_SIZE - 1)) +
				(page_address(page) - page_address(head_page));
			/* page_offset only refers to the beginning of sgt[i];
			 * but the buffer itself may have an internal offset.
			 */
			frag_off = qm_sg_entry_get_off(&sgt[i]) + page_offset;
			frag_len = qm_sg_entry_get_len(&sgt[i]);
			/* skb_add_rx_frag() does no checking on the page; if
			 * we pass it a tail page, we'll end up with
			 * bad page accounting and eventually with segafults.
			 */
			skb_add_rx_frag(skb, i - 1, head_page, frag_off,
					frag_len, dpaa_bp->size);
		}
		/* Update the pool count for the current {cpu x bpool} */
		(*count_ptr)--;

		if (qm_sg_entry_is_final(&sgt[i]))
			break;
	}
	WARN_ONCE(i == DPAA_SGT_MAX_ENTRIES, "No final bit on SGT\n");

	/* free the SG table buffer */
	skb_free_frag(vaddr);

	return skb;

free_buffers:
	/* compensate sw bpool counter changes */
	for (i--; i > 0; i--) {
		dpaa_bp = dpaa_bpid2pool(sgt[i].bpid);
		if (dpaa_bp) {
			count_ptr = this_cpu_ptr(dpaa_bp->percpu_count);
			(*count_ptr)++;
		}
	}
	/* free all the SG entries */
	for (i = 0; i < DPAA_SGT_MAX_ENTRIES ; i++) {
		sg_addr = qm_sg_addr(&sgt[i]);
		sg_vaddr = phys_to_virt(sg_addr);
		skb_free_frag(sg_vaddr);
		dpaa_bp = dpaa_bpid2pool(sgt[i].bpid);
		if (dpaa_bp) {
			count_ptr = this_cpu_ptr(dpaa_bp->percpu_count);
			(*count_ptr)--;
		}

		if (qm_sg_entry_is_final(&sgt[i]))
			break;
	}
	/* free the SGT fragment */
	skb_free_frag(vaddr);

	return NULL;
}

static int skb_to_contig_fd(struct dpaa_priv *priv,
			    struct sk_buff *skb, struct qm_fd *fd,
			    int *offset)
{
	struct net_device *net_dev = priv->net_dev;
	struct device *dev = net_dev->dev.parent;
	enum dma_data_direction dma_dir;
	unsigned char *buffer_start;
	struct sk_buff **skbh;
	dma_addr_t addr;
	int err;

	/* We are guaranteed to have at least tx_headroom bytes
	 * available, so just use that for offset.
	 */
	fd->bpid = FSL_DPAA_BPID_INV;
	buffer_start = skb->data - priv->tx_headroom;
	dma_dir = DMA_TO_DEVICE;

	skbh = (struct sk_buff **)buffer_start;
	*skbh = skb;

	/* 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 = dpaa_enable_tx_csum(priv, skb, fd,
				  ((char *)skbh) + DPAA_TX_PRIV_DATA_SIZE);
	if (unlikely(err < 0)) {
		if (net_ratelimit())
			netif_err(priv, tx_err, net_dev, "HW csum error: %d\n",
				  err);
		return err;
	}

	/* Fill in the rest of the FD fields */
	qm_fd_set_contig(fd, priv->tx_headroom, skb->len);
1735
	fd->cmd |= cpu_to_be32(FM_FD_CMD_FCO);
1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842

	/* Map the entire buffer size that may be seen by FMan, but no more */
	addr = dma_map_single(dev, skbh,
			      skb_tail_pointer(skb) - buffer_start, dma_dir);
	if (unlikely(dma_mapping_error(dev, addr))) {
		if (net_ratelimit())
			netif_err(priv, tx_err, net_dev, "dma_map_single() failed\n");
		return -EINVAL;
	}
	qm_fd_addr_set64(fd, addr);

	return 0;
}

static int skb_to_sg_fd(struct dpaa_priv *priv,
			struct sk_buff *skb, struct qm_fd *fd)
{
	const enum dma_data_direction dma_dir = DMA_TO_DEVICE;
	const int nr_frags = skb_shinfo(skb)->nr_frags;
	struct net_device *net_dev = priv->net_dev;
	struct device *dev = net_dev->dev.parent;
	struct qm_sg_entry *sgt;
	struct sk_buff **skbh;
	int i, j, err, sz;
	void *buffer_start;
	skb_frag_t *frag;
	dma_addr_t addr;
	size_t frag_len;
	void *sgt_buf;

	/* get a page frag to store the SGTable */
	sz = SKB_DATA_ALIGN(priv->tx_headroom +
		sizeof(struct qm_sg_entry) * (1 + nr_frags));
	sgt_buf = netdev_alloc_frag(sz);
	if (unlikely(!sgt_buf)) {
		netdev_err(net_dev, "netdev_alloc_frag() failed for size %d\n",
			   sz);
		return -ENOMEM;
	}

	/* 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 = dpaa_enable_tx_csum(priv, skb, fd,
				  sgt_buf + DPAA_TX_PRIV_DATA_SIZE);
	if (unlikely(err < 0)) {
		if (net_ratelimit())
			netif_err(priv, tx_err, net_dev, "HW csum error: %d\n",
				  err);
		goto csum_failed;
	}

	sgt = (struct qm_sg_entry *)(sgt_buf + priv->tx_headroom);
	qm_sg_entry_set_len(&sgt[0], skb_headlen(skb));
	sgt[0].bpid = FSL_DPAA_BPID_INV;
	sgt[0].offset = 0;
	addr = dma_map_single(dev, skb->data,
			      skb_headlen(skb), dma_dir);
	if (unlikely(dma_mapping_error(dev, addr))) {
		dev_err(dev, "DMA mapping failed");
		err = -EINVAL;
		goto sg0_map_failed;
	}
	qm_sg_entry_set64(&sgt[0], addr);

	/* populate the rest of SGT entries */
	frag = &skb_shinfo(skb)->frags[0];
	frag_len = frag->size;
	for (i = 1; i <= nr_frags; i++, frag++) {
		WARN_ON(!skb_frag_page(frag));
		addr = skb_frag_dma_map(dev, frag, 0,
					frag_len, dma_dir);
		if (unlikely(dma_mapping_error(dev, addr))) {
			dev_err(dev, "DMA mapping failed");
			err = -EINVAL;
			goto sg_map_failed;
		}

		qm_sg_entry_set_len(&sgt[i], frag_len);
		sgt[i].bpid = FSL_DPAA_BPID_INV;
		sgt[i].offset = 0;

		/* keep the offset in the address */
		qm_sg_entry_set64(&sgt[i], addr);
		frag_len = frag->size;
	}
	qm_sg_entry_set_f(&sgt[i - 1], frag_len);

	qm_fd_set_sg(fd, priv->tx_headroom, skb->len);

	/* DMA map the SGT page */
	buffer_start = (void *)sgt - priv->tx_headroom;
	skbh = (struct sk_buff **)buffer_start;
	*skbh = skb;

	addr = dma_map_single(dev, buffer_start, priv->tx_headroom +
			      sizeof(struct qm_sg_entry) * (1 + nr_frags),
			      dma_dir);
	if (unlikely(dma_mapping_error(dev, addr))) {
		dev_err(dev, "DMA mapping failed");
		err = -EINVAL;
		goto sgt_map_failed;
	}

	fd->bpid = FSL_DPAA_BPID_INV;
1843
	fd->cmd |= cpu_to_be32(FM_FD_CMD_FCO);
1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869
	qm_fd_addr_set64(fd, addr);

	return 0;

sgt_map_failed:
sg_map_failed:
	for (j = 0; j < i; j++)
		dma_unmap_page(dev, qm_sg_addr(&sgt[j]),
			       qm_sg_entry_get_len(&sgt[j]), dma_dir);
sg0_map_failed:
csum_failed:
	skb_free_frag(sgt_buf);

	return err;
}

static inline int dpaa_xmit(struct dpaa_priv *priv,
			    struct rtnl_link_stats64 *percpu_stats,
			    int queue,
			    struct qm_fd *fd)
{
	struct qman_fq *egress_fq;
	int err, i;

	egress_fq = priv->egress_fqs[queue];
	if (fd->bpid == FSL_DPAA_BPID_INV)
1870
		fd->cmd |= cpu_to_be32(qman_fq_fqid(priv->conf_fqs[queue]));
1871

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	/* Trace this Tx fd */
	trace_dpaa_tx_fd(priv->net_dev, egress_fq, fd);

1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929
	for (i = 0; i < DPAA_ENQUEUE_RETRIES; i++) {
		err = qman_enqueue(egress_fq, fd);
		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 += qm_fd_get_length(fd);

	return 0;
}

static int dpaa_start_xmit(struct sk_buff *skb, struct net_device *net_dev)
{
	const int queue_mapping = skb_get_queue_mapping(skb);
	bool nonlinear = skb_is_nonlinear(skb);
	struct rtnl_link_stats64 *percpu_stats;
	struct dpaa_percpu_priv *percpu_priv;
	struct dpaa_priv *priv;
	struct qm_fd fd;
	int offset = 0;
	int err = 0;

	priv = netdev_priv(net_dev);
	percpu_priv = this_cpu_ptr(priv->percpu_priv);
	percpu_stats = &percpu_priv->stats;

	qm_fd_clear_fd(&fd);

	if (!nonlinear) {
		/* We're going to store the skb backpointer at the beginning
		 * of the data buffer, so we need a privately owned skb
		 *
		 * We've made sure skb is not shared in dev->priv_flags,
		 * we need to verify the skb head is not cloned
		 */
		if (skb_cow_head(skb, priv->tx_headroom))
			goto enomem;

		WARN_ON(skb_is_nonlinear(skb));
	}

	/* MAX_SKB_FRAGS is equal or larger than our dpaa_SGT_MAX_ENTRIES;
	 * make sure we don't feed FMan with more fragments than it supports.
	 */
	if (nonlinear &&
	    likely(skb_shinfo(skb)->nr_frags < DPAA_SGT_MAX_ENTRIES)) {
		/* Just create a S/G fd based on the skb */
		err = skb_to_sg_fd(priv, skb, &fd);
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		percpu_priv->tx_frag_skbuffs++;
1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962
	} else {
		/* If the egress skb contains more fragments than we support
		 * we have no choice but to linearize it ourselves.
		 */
		if (unlikely(nonlinear) && __skb_linearize(skb))
			goto enomem;

		/* Finally, create a contig FD from this skb */
		err = skb_to_contig_fd(priv, skb, &fd, &offset);
	}
	if (unlikely(err < 0))
		goto skb_to_fd_failed;

	if (likely(dpaa_xmit(priv, percpu_stats, queue_mapping, &fd) == 0))
		return NETDEV_TX_OK;

	dpaa_cleanup_tx_fd(priv, &fd);
skb_to_fd_failed:
enomem:
	percpu_stats->tx_errors++;
	dev_kfree_skb(skb);
	return NETDEV_TX_OK;
}

static void dpaa_rx_error(struct net_device *net_dev,
			  const struct dpaa_priv *priv,
			  struct dpaa_percpu_priv *percpu_priv,
			  const struct qm_fd *fd,
			  u32 fqid)
{
	if (net_ratelimit())
		netif_err(priv, hw, net_dev, "Err FD status = 0x%08x\n",
1963
			  be32_to_cpu(fd->status) & FM_FD_STAT_RX_ERRORS);
1964 1965 1966

	percpu_priv->stats.rx_errors++;

1967
	if (be32_to_cpu(fd->status) & FM_FD_ERR_DMA)
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		percpu_priv->rx_errors.dme++;
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	if (be32_to_cpu(fd->status) & FM_FD_ERR_PHYSICAL)
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		percpu_priv->rx_errors.fpe++;
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	if (be32_to_cpu(fd->status) & FM_FD_ERR_SIZE)
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		percpu_priv->rx_errors.fse++;
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	if (be32_to_cpu(fd->status) & FM_FD_ERR_PRS_HDR_ERR)
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		percpu_priv->rx_errors.phe++;

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	dpaa_fd_release(net_dev, fd);
}

static void dpaa_tx_error(struct net_device *net_dev,
			  const struct dpaa_priv *priv,
			  struct dpaa_percpu_priv *percpu_priv,
			  const struct qm_fd *fd,
			  u32 fqid)
{
	struct sk_buff *skb;

	if (net_ratelimit())
		netif_warn(priv, hw, net_dev, "FD status = 0x%08x\n",
1989
			   be32_to_cpu(fd->status) & FM_FD_STAT_TX_ERRORS);
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	percpu_priv->stats.tx_errors++;

	skb = dpaa_cleanup_tx_fd(priv, fd);
	dev_kfree_skb(skb);
}

static int dpaa_eth_poll(struct napi_struct *napi, int budget)
{
	struct dpaa_napi_portal *np =
			container_of(napi, struct dpaa_napi_portal, napi);

	int cleaned = qman_p_poll_dqrr(np->p, budget);

	if (cleaned < budget) {
		napi_complete(napi);
		qman_p_irqsource_add(np->p, QM_PIRQ_DQRI);

	} else if (np->down) {
		qman_p_irqsource_add(np->p, QM_PIRQ_DQRI);
	}

	return cleaned;
}

static void dpaa_tx_conf(struct net_device *net_dev,
			 const struct dpaa_priv *priv,
			 struct dpaa_percpu_priv *percpu_priv,
			 const struct qm_fd *fd,
			 u32 fqid)
{
	struct sk_buff	*skb;

2023
	if (unlikely(be32_to_cpu(fd->status) & FM_FD_STAT_TX_ERRORS)) {
2024 2025
		if (net_ratelimit())
			netif_warn(priv, hw, net_dev, "FD status = 0x%08x\n",
2026 2027
				   be32_to_cpu(fd->status) &
				   FM_FD_STAT_TX_ERRORS);
2028 2029 2030 2031

		percpu_priv->stats.tx_errors++;
	}

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	percpu_priv->tx_confirm++;

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	skb = dpaa_cleanup_tx_fd(priv, fd);

	consume_skb(skb);
}

static inline int dpaa_eth_napi_schedule(struct dpaa_percpu_priv *percpu_priv,
					 struct qman_portal *portal)
{
	if (unlikely(in_irq() || !in_serving_softirq())) {
		/* Disable QMan IRQ and invoke NAPI */
		qman_p_irqsource_remove(portal, QM_PIRQ_DQRI);

		percpu_priv->np.p = portal;
		napi_schedule(&percpu_priv->np.napi);
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		percpu_priv->in_interrupt++;
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		return 1;
	}
	return 0;
}

static enum qman_cb_dqrr_result rx_error_dqrr(struct qman_portal *portal,
					      struct qman_fq *fq,
					      const struct qm_dqrr_entry *dq)
{
	struct dpaa_fq *dpaa_fq = container_of(fq, struct dpaa_fq, fq_base);
	struct dpaa_percpu_priv *percpu_priv;
	struct net_device *net_dev;
	struct dpaa_bp *dpaa_bp;
	struct dpaa_priv *priv;

	net_dev = dpaa_fq->net_dev;
	priv = netdev_priv(net_dev);
	dpaa_bp = dpaa_bpid2pool(dq->fd.bpid);
	if (!dpaa_bp)
		return qman_cb_dqrr_consume;

	percpu_priv = this_cpu_ptr(priv->percpu_priv);

	if (dpaa_eth_napi_schedule(percpu_priv, portal))
		return qman_cb_dqrr_stop;

	if (dpaa_eth_refill_bpools(priv))
		/* Unable to refill the buffer pool due to insufficient
		 * system memory. Just release the frame back into the pool,
		 * otherwise we'll soon end up with an empty buffer pool.
		 */
		dpaa_fd_release(net_dev, &dq->fd);
	else
		dpaa_rx_error(net_dev, priv, percpu_priv, &dq->fd, fq->fqid);

	return qman_cb_dqrr_consume;
}

static enum qman_cb_dqrr_result rx_default_dqrr(struct qman_portal *portal,
						struct qman_fq *fq,
						const struct qm_dqrr_entry *dq)
{
	struct rtnl_link_stats64 *percpu_stats;
	struct dpaa_percpu_priv *percpu_priv;
	const struct qm_fd *fd = &dq->fd;
	dma_addr_t addr = qm_fd_addr(fd);
	enum qm_fd_format fd_format;
	struct net_device *net_dev;
	u32 fd_status = fd->status;
	struct dpaa_bp *dpaa_bp;
	struct dpaa_priv *priv;
	unsigned int skb_len;
	struct sk_buff *skb;
	int *count_ptr;

2104 2105
	fd_status = be32_to_cpu(fd->status);
	fd_format = qm_fd_get_format(fd);
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	net_dev = ((struct dpaa_fq *)fq)->net_dev;
	priv = netdev_priv(net_dev);
	dpaa_bp = dpaa_bpid2pool(dq->fd.bpid);
	if (!dpaa_bp)
		return qman_cb_dqrr_consume;

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	/* Trace the Rx fd */
	trace_dpaa_rx_fd(net_dev, fq, &dq->fd);

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	percpu_priv = this_cpu_ptr(priv->percpu_priv);
	percpu_stats = &percpu_priv->stats;

	if (unlikely(dpaa_eth_napi_schedule(percpu_priv, portal)))
		return qman_cb_dqrr_stop;

	/* Make sure we didn't run out of buffers */
	if (unlikely(dpaa_eth_refill_bpools(priv))) {
		/* Unable to refill the buffer pool due to insufficient
		 * system memory. Just release the frame back into the pool,
		 * otherwise we'll soon end up with an empty buffer pool.
		 */
		dpaa_fd_release(net_dev, &dq->fd);
		return qman_cb_dqrr_consume;
	}

	if (unlikely(fd_status & FM_FD_STAT_RX_ERRORS) != 0) {
		if (net_ratelimit())
			netif_warn(priv, hw, net_dev, "FD status = 0x%08x\n",
				   fd_status & FM_FD_STAT_RX_ERRORS);

		percpu_stats->rx_errors++;
		dpaa_fd_release(net_dev, fd);
		return qman_cb_dqrr_consume;
	}

	dpaa_bp = dpaa_bpid2pool(fd->bpid);
	if (!dpaa_bp)
		return qman_cb_dqrr_consume;

	dma_unmap_single(dpaa_bp->dev, addr, dpaa_bp->size, DMA_FROM_DEVICE);

	/* prefetch the first 64 bytes of the frame or the SGT start */
	prefetch(phys_to_virt(addr) + qm_fd_get_offset(fd));

	fd_format = qm_fd_get_format(fd);
	/* The only FD types that we may receive are contig and S/G */
	WARN_ON((fd_format != qm_fd_contig) && (fd_format != qm_fd_sg));

	/* Account for either the contig buffer or the SGT buffer (depending on
	 * which case we were in) having been removed from the pool.
	 */
	count_ptr = this_cpu_ptr(dpaa_bp->percpu_count);
	(*count_ptr)--;

	if (likely(fd_format == qm_fd_contig))
		skb = contig_fd_to_skb(priv, fd);
	else
		skb = sg_fd_to_skb(priv, fd);
	if (!skb)
		return qman_cb_dqrr_consume;

	skb->protocol = eth_type_trans(skb, net_dev);

	skb_len = skb->len;

	if (unlikely(netif_receive_skb(skb) == NET_RX_DROP))
		return qman_cb_dqrr_consume;

	percpu_stats->rx_packets++;
	percpu_stats->rx_bytes += skb_len;

	return qman_cb_dqrr_consume;
}

static enum qman_cb_dqrr_result conf_error_dqrr(struct qman_portal *portal,
						struct qman_fq *fq,
						const struct qm_dqrr_entry *dq)
{
	struct dpaa_percpu_priv *percpu_priv;
	struct net_device *net_dev;
	struct dpaa_priv *priv;

	net_dev = ((struct dpaa_fq *)fq)->net_dev;
	priv = netdev_priv(net_dev);

	percpu_priv = this_cpu_ptr(priv->percpu_priv);

	if (dpaa_eth_napi_schedule(percpu_priv, portal))
		return qman_cb_dqrr_stop;

	dpaa_tx_error(net_dev, priv, percpu_priv, &dq->fd, fq->fqid);

	return qman_cb_dqrr_consume;
}

static enum qman_cb_dqrr_result conf_dflt_dqrr(struct qman_portal *portal,
					       struct qman_fq *fq,
					       const struct qm_dqrr_entry *dq)
{
	struct dpaa_percpu_priv *percpu_priv;
	struct net_device *net_dev;
	struct dpaa_priv *priv;

	net_dev = ((struct dpaa_fq *)fq)->net_dev;
	priv = netdev_priv(net_dev);

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	/* Trace the fd */
	trace_dpaa_tx_conf_fd(net_dev, fq, &dq->fd);

2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240
	percpu_priv = this_cpu_ptr(priv->percpu_priv);

	if (dpaa_eth_napi_schedule(percpu_priv, portal))
		return qman_cb_dqrr_stop;

	dpaa_tx_conf(net_dev, priv, percpu_priv, &dq->fd, fq->fqid);

	return qman_cb_dqrr_consume;
}

static void egress_ern(struct qman_portal *portal,
		       struct qman_fq *fq,
		       const union qm_mr_entry *msg)
{
	const struct qm_fd *fd = &msg->ern.fd;
	struct dpaa_percpu_priv *percpu_priv;
	const struct dpaa_priv *priv;
	struct net_device *net_dev;
	struct sk_buff *skb;

	net_dev = ((struct dpaa_fq *)fq)->net_dev;
	priv = netdev_priv(net_dev);
	percpu_priv = this_cpu_ptr(priv->percpu_priv);

	percpu_priv->stats.tx_dropped++;
	percpu_priv->stats.tx_fifo_errors++;
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	count_ern(percpu_priv, msg);
2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293

	skb = dpaa_cleanup_tx_fd(priv, fd);
	dev_kfree_skb_any(skb);
}

static const struct dpaa_fq_cbs dpaa_fq_cbs = {
	.rx_defq = { .cb = { .dqrr = rx_default_dqrr } },
	.tx_defq = { .cb = { .dqrr = conf_dflt_dqrr } },
	.rx_errq = { .cb = { .dqrr = rx_error_dqrr } },
	.tx_errq = { .cb = { .dqrr = conf_error_dqrr } },
	.egress_ern = { .cb = { .ern = egress_ern } }
};

static void dpaa_eth_napi_enable(struct dpaa_priv *priv)
{
	struct dpaa_percpu_priv *percpu_priv;
	int i;

	for_each_possible_cpu(i) {
		percpu_priv = per_cpu_ptr(priv->percpu_priv, i);

		percpu_priv->np.down = 0;
		napi_enable(&percpu_priv->np.napi);
	}
}

static void dpaa_eth_napi_disable(struct dpaa_priv *priv)
{
	struct dpaa_percpu_priv *percpu_priv;
	int i;

	for_each_possible_cpu(i) {
		percpu_priv = per_cpu_ptr(priv->percpu_priv, i);

		percpu_priv->np.down = 1;
		napi_disable(&percpu_priv->np.napi);
	}
}

static int dpaa_open(struct net_device *net_dev)
{
	struct mac_device *mac_dev;
	struct dpaa_priv *priv;
	int err, i;

	priv = netdev_priv(net_dev);
	mac_dev = priv->mac_dev;
	dpaa_eth_napi_enable(priv);

	net_dev->phydev = mac_dev->init_phy(net_dev, priv->mac_dev);
	if (!net_dev->phydev) {
		netif_err(priv, ifup, net_dev, "init_phy() failed\n");
2294 2295
		err = -ENODEV;
		goto phy_init_failed;
2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317
	}

	for (i = 0; i < ARRAY_SIZE(mac_dev->port); i++) {
		err = fman_port_enable(mac_dev->port[i]);
		if (err)
			goto mac_start_failed;
	}

	err = priv->mac_dev->start(mac_dev);
	if (err < 0) {
		netif_err(priv, ifup, 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 (i = 0; i < ARRAY_SIZE(mac_dev->port); i++)
		fman_port_disable(mac_dev->port[i]);

2318
phy_init_failed:
2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424
	dpaa_eth_napi_disable(priv);

	return err;
}

static int dpaa_eth_stop(struct net_device *net_dev)
{
	struct dpaa_priv *priv;
	int err;

	err = dpaa_stop(net_dev);

	priv = netdev_priv(net_dev);
	dpaa_eth_napi_disable(priv);

	return err;
}

static const struct net_device_ops dpaa_ops = {
	.ndo_open = dpaa_open,
	.ndo_start_xmit = dpaa_start_xmit,
	.ndo_stop = dpaa_eth_stop,
	.ndo_tx_timeout = dpaa_tx_timeout,
	.ndo_get_stats64 = dpaa_get_stats64,
	.ndo_set_mac_address = dpaa_set_mac_address,
	.ndo_validate_addr = eth_validate_addr,
	.ndo_set_rx_mode = dpaa_set_rx_mode,
};

static int dpaa_napi_add(struct net_device *net_dev)
{
	struct dpaa_priv *priv = netdev_priv(net_dev);
	struct dpaa_percpu_priv *percpu_priv;
	int cpu;

	for_each_possible_cpu(cpu) {
		percpu_priv = per_cpu_ptr(priv->percpu_priv, cpu);

		netif_napi_add(net_dev, &percpu_priv->np.napi,
			       dpaa_eth_poll, NAPI_POLL_WEIGHT);
	}

	return 0;
}

static void dpaa_napi_del(struct net_device *net_dev)
{
	struct dpaa_priv *priv = netdev_priv(net_dev);
	struct dpaa_percpu_priv *percpu_priv;
	int cpu;

	for_each_possible_cpu(cpu) {
		percpu_priv = per_cpu_ptr(priv->percpu_priv, cpu);

		netif_napi_del(&percpu_priv->np.napi);
	}
}

static inline void dpaa_bp_free_pf(const struct dpaa_bp *bp,
				   struct bm_buffer *bmb)
{
	dma_addr_t addr = bm_buf_addr(bmb);

	dma_unmap_single(bp->dev, addr, bp->size, DMA_FROM_DEVICE);

	skb_free_frag(phys_to_virt(addr));
}

/* Alloc the dpaa_bp struct and configure default values */
static struct dpaa_bp *dpaa_bp_alloc(struct device *dev)
{
	struct dpaa_bp *dpaa_bp;

	dpaa_bp = devm_kzalloc(dev, sizeof(*dpaa_bp), GFP_KERNEL);
	if (!dpaa_bp)
		return ERR_PTR(-ENOMEM);

	dpaa_bp->bpid = FSL_DPAA_BPID_INV;
	dpaa_bp->percpu_count = devm_alloc_percpu(dev, *dpaa_bp->percpu_count);
	dpaa_bp->config_count = FSL_DPAA_ETH_MAX_BUF_COUNT;

	dpaa_bp->seed_cb = dpaa_bp_seed;
	dpaa_bp->free_buf_cb = dpaa_bp_free_pf;

	return dpaa_bp;
}

/* Place all ingress FQs (Rx Default, Rx Error) in a dedicated CGR.
 * We won't be sending congestion notifications to FMan; for now, we just use
 * this CGR to generate enqueue rejections to FMan in order to drop the frames
 * before they reach our ingress queues and eat up memory.
 */
static int dpaa_ingress_cgr_init(struct dpaa_priv *priv)
{
	struct qm_mcc_initcgr initcgr;
	u32 cs_th;
	int err;

	err = qman_alloc_cgrid(&priv->ingress_cgr.cgrid);
	if (err < 0) {
		if (netif_msg_drv(priv))
			pr_err("Error %d allocating CGR ID\n", err);
		goto out_error;
	}

	/* Enable CS TD, but disable Congestion State Change Notifications. */
2425
	initcgr.we_mask = cpu_to_be16(QM_CGR_WE_CS_THRES);
2426 2427 2428 2429
	initcgr.cgr.cscn_en = QM_CGR_EN;
	cs_th = DPAA_INGRESS_CS_THRESHOLD;
	qm_cgr_cs_thres_set64(&initcgr.cgr.cs_thres, cs_th, 1);

2430
	initcgr.we_mask |= cpu_to_be16(QM_CGR_WE_CSTD_EN);
2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641
	initcgr.cgr.cstd_en = QM_CGR_EN;

	/* This CGR will be associated with the SWP affined to the current CPU.
	 * However, we'll place all our ingress FQs in it.
	 */
	err = qman_create_cgr(&priv->ingress_cgr, QMAN_CGR_FLAG_USE_INIT,
			      &initcgr);
	if (err < 0) {
		if (netif_msg_drv(priv))
			pr_err("Error %d creating ingress CGR with ID %d\n",
			       err, priv->ingress_cgr.cgrid);
		qman_release_cgrid(priv->ingress_cgr.cgrid);
		goto out_error;
	}
	if (netif_msg_drv(priv))
		pr_debug("Created ingress CGR %d for netdev with hwaddr %pM\n",
			 priv->ingress_cgr.cgrid, priv->mac_dev->addr);

	priv->use_ingress_cgr = true;

out_error:
	return err;
}

static const struct of_device_id dpaa_match[];

static inline u16 dpaa_get_headroom(struct dpaa_buffer_layout *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 + DPAA_PARSE_RESULTS_SIZE +
		DPAA_TIME_STAMP_SIZE + DPAA_HASH_RESULTS_SIZE);

	return DPAA_FD_DATA_ALIGNMENT ? ALIGN(headroom,
					      DPAA_FD_DATA_ALIGNMENT) :
					headroom;
}

static int dpaa_eth_probe(struct platform_device *pdev)
{
	struct dpaa_bp *dpaa_bps[DPAA_BPS_NUM] = {NULL};
	struct dpaa_percpu_priv *percpu_priv;
	struct net_device *net_dev = NULL;
	struct dpaa_fq *dpaa_fq, *tmp;
	struct dpaa_priv *priv = NULL;
	struct fm_port_fqs port_fqs;
	struct mac_device *mac_dev;
	int err = 0, i, channel;
	struct device *dev;

	dev = &pdev->dev;

	/* Allocate this early, so we can store relevant information in
	 * the private area
	 */
	net_dev = alloc_etherdev_mq(sizeof(*priv), DPAA_ETH_TXQ_NUM);
	if (!net_dev) {
		dev_err(dev, "alloc_etherdev_mq() failed\n");
		goto alloc_etherdev_mq_failed;
	}

	/* Do this here, so we can be verbose early */
	SET_NETDEV_DEV(net_dev, dev);
	dev_set_drvdata(dev, net_dev);

	priv = netdev_priv(net_dev);
	priv->net_dev = net_dev;

	priv->msg_enable = netif_msg_init(debug, DPAA_MSG_DEFAULT);

	mac_dev = dpaa_mac_dev_get(pdev);
	if (IS_ERR(mac_dev)) {
		dev_err(dev, "dpaa_mac_dev_get() failed\n");
		err = PTR_ERR(mac_dev);
		goto mac_probe_failed;
	}

	/* 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.
	 */
	net_dev->mtu = min(dpaa_get_max_mtu(), ETH_DATA_LEN);

	netdev_dbg(net_dev, "Setting initial MTU on net device: %d\n",
		   net_dev->mtu);

	priv->buf_layout[RX].priv_data_size = DPAA_RX_PRIV_DATA_SIZE; /* Rx */
	priv->buf_layout[TX].priv_data_size = DPAA_TX_PRIV_DATA_SIZE; /* Tx */

	/* device used for DMA mapping */
	arch_setup_dma_ops(dev, 0, 0, NULL, false);
	err = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(40));
	if (err) {
		dev_err(dev, "dma_coerce_mask_and_coherent() failed\n");
		goto dev_mask_failed;
	}

	/* bp init */
	for (i = 0; i < DPAA_BPS_NUM; i++) {
		int err;

		dpaa_bps[i] = dpaa_bp_alloc(dev);
		if (IS_ERR(dpaa_bps[i]))
			return PTR_ERR(dpaa_bps[i]);
		/* the raw size of the buffers used for reception */
		dpaa_bps[i]->raw_size = bpool_buffer_raw_size(i, DPAA_BPS_NUM);
		/* avoid runtime computations by keeping the usable size here */
		dpaa_bps[i]->size = dpaa_bp_size(dpaa_bps[i]->raw_size);
		dpaa_bps[i]->dev = dev;

		err = dpaa_bp_alloc_pool(dpaa_bps[i]);
		if (err < 0) {
			dpaa_bps_free(priv);
			priv->dpaa_bps[i] = NULL;
			goto bp_create_failed;
		}
		priv->dpaa_bps[i] = dpaa_bps[i];
	}

	INIT_LIST_HEAD(&priv->dpaa_fq_list);

	memset(&port_fqs, 0, sizeof(port_fqs));

	err = dpaa_alloc_all_fqs(dev, &priv->dpaa_fq_list, &port_fqs);
	if (err < 0) {
		dev_err(dev, "dpaa_alloc_all_fqs() failed\n");
		goto fq_probe_failed;
	}

	priv->mac_dev = mac_dev;

	channel = dpaa_get_channel();
	if (channel < 0) {
		dev_err(dev, "dpaa_get_channel() failed\n");
		err = channel;
		goto get_channel_failed;
	}

	priv->channel = (u16)channel;

	/* Start a thread that will walk the CPUs with affine portals
	 * and add this pool channel to each's dequeue mask.
	 */
	dpaa_eth_add_channel(priv->channel);

	dpaa_fq_setup(priv, &dpaa_fq_cbs, priv->mac_dev->port[TX]);

	/* Create a congestion group for this netdev, with
	 * dynamically-allocated CGR ID.
	 * Must be executed after probing the MAC, but before
	 * assigning the egress FQs to the CGRs.
	 */
	err = dpaa_eth_cgr_init(priv);
	if (err < 0) {
		dev_err(dev, "Error initializing CGR\n");
		goto tx_cgr_init_failed;
	}

	err = dpaa_ingress_cgr_init(priv);
	if (err < 0) {
		dev_err(dev, "Error initializing ingress CGR\n");
		goto rx_cgr_init_failed;
	}

	/* Add the FQs to the interface, and make them active */
	list_for_each_entry_safe(dpaa_fq, tmp, &priv->dpaa_fq_list, list) {
		err = dpaa_fq_init(dpaa_fq, false);
		if (err < 0)
			goto fq_alloc_failed;
	}

	priv->tx_headroom = dpaa_get_headroom(&priv->buf_layout[TX]);
	priv->rx_headroom = dpaa_get_headroom(&priv->buf_layout[RX]);

	/* All real interfaces need their ports initialized */
	dpaa_eth_init_ports(mac_dev, dpaa_bps, DPAA_BPS_NUM, &port_fqs,
			    &priv->buf_layout[0], dev);

	priv->percpu_priv = devm_alloc_percpu(dev, *priv->percpu_priv);
	if (!priv->percpu_priv) {
		dev_err(dev, "devm_alloc_percpu() failed\n");
		err = -ENOMEM;
		goto alloc_percpu_failed;
	}
	for_each_possible_cpu(i) {
		percpu_priv = per_cpu_ptr(priv->percpu_priv, i);
		memset(percpu_priv, 0, sizeof(*percpu_priv));
	}

	/* Initialize NAPI */
	err = dpaa_napi_add(net_dev);
	if (err < 0)
		goto napi_add_failed;

	err = dpaa_netdev_init(net_dev, &dpaa_ops, tx_timeout);
	if (err < 0)
		goto netdev_init_failed;

M
Madalin Bucur 已提交
2642 2643
	dpaa_eth_sysfs_init(&net_dev->dev);

2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688
	netif_info(priv, probe, net_dev, "Probed interface %s\n",
		   net_dev->name);

	return 0;

netdev_init_failed:
napi_add_failed:
	dpaa_napi_del(net_dev);
alloc_percpu_failed:
	dpaa_fq_free(dev, &priv->dpaa_fq_list);
fq_alloc_failed:
	qman_delete_cgr_safe(&priv->ingress_cgr);
	qman_release_cgrid(priv->ingress_cgr.cgrid);
rx_cgr_init_failed:
	qman_delete_cgr_safe(&priv->cgr_data.cgr);
	qman_release_cgrid(priv->cgr_data.cgr.cgrid);
tx_cgr_init_failed:
get_channel_failed:
	dpaa_bps_free(priv);
bp_create_failed:
fq_probe_failed:
dev_mask_failed:
mac_probe_failed:
	dev_set_drvdata(dev, NULL);
	free_netdev(net_dev);
alloc_etherdev_mq_failed:
	for (i = 0; i < DPAA_BPS_NUM && dpaa_bps[i]; i++) {
		if (atomic_read(&dpaa_bps[i]->refs) == 0)
			devm_kfree(dev, dpaa_bps[i]);
	}
	return err;
}

static int dpaa_remove(struct platform_device *pdev)
{
	struct net_device *net_dev;
	struct dpaa_priv *priv;
	struct device *dev;
	int err;

	dev = &pdev->dev;
	net_dev = dev_get_drvdata(dev);

	priv = netdev_priv(net_dev);

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Madalin Bucur 已提交
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	dpaa_eth_sysfs_remove(dev);

2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758
	dev_set_drvdata(dev, NULL);
	unregister_netdev(net_dev);

	err = dpaa_fq_free(dev, &priv->dpaa_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);

	dpaa_napi_del(net_dev);

	dpaa_bps_free(priv);

	free_netdev(net_dev);

	return err;
}

static struct platform_device_id dpaa_devtype[] = {
	{
		.name = "dpaa-ethernet",
		.driver_data = 0,
	}, {
	}
};
MODULE_DEVICE_TABLE(platform, dpaa_devtype);

static struct platform_driver dpaa_driver = {
	.driver = {
		.name = KBUILD_MODNAME,
	},
	.id_table = dpaa_devtype,
	.probe = dpaa_eth_probe,
	.remove = dpaa_remove
};

static int __init dpaa_load(void)
{
	int err;

	pr_debug("FSL DPAA Ethernet driver\n");

	/* initialize dpaa_eth mirror values */
	dpaa_rx_extra_headroom = fman_get_rx_extra_headroom();
	dpaa_max_frm = fman_get_max_frm();

	err = platform_driver_register(&dpaa_driver);
	if (err < 0)
		pr_err("Error, platform_driver_register() = %d\n", err);

	return err;
}
module_init(dpaa_load);

static void __exit dpaa_unload(void)
{
	platform_driver_unregister(&dpaa_driver);

	/* Only one channel is used and needs to be released after all
	 * interfaces are removed
	 */
	dpaa_release_channel();
}
module_exit(dpaa_unload);

MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("FSL DPAA Ethernet driver");