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/*********************************************************************
* Author: Cavium Networks
*
* Contact: support@caviumnetworks.com
* This file is part of the OCTEON SDK
*
* Copyright (c) 2003-2010 Cavium Networks
*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, Version 2, as
* published by the Free Software Foundation.
*
* This file is distributed in the hope that it will be useful, but
* AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
* NONINFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this file; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
* or visit http://www.gnu.org/licenses/.
*
* This file may also be available under a different license from Cavium.
* Contact Cavium Networks for more information
*********************************************************************/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/init.h>
#include <linux/etherdevice.h>
#include <linux/ip.h>
#include <linux/string.h>
#include <net/dst.h>
#ifdef CONFIG_XFRM
#include <linux/xfrm.h>
#include <net/xfrm.h>
#endif /* CONFIG_XFRM */
#include <asm/atomic.h>
#include <asm/octeon/octeon.h>
#include "ethernet-defines.h"
#include "octeon-ethernet.h"
#include "ethernet-tx.h"
#include "ethernet-util.h"
#include "cvmx-wqe.h"
#include "cvmx-fau.h"
#include "cvmx-pko.h"
#include "cvmx-helper.h"
#include "cvmx-gmxx-defs.h"
#define CVM_OCT_SKB_CB(skb) ((u64 *)((skb)->cb))
/*
* You can define GET_SKBUFF_QOS() to override how the skbuff output
* function determines which output queue is used. The default
* implementation always uses the base queue for the port. If, for
* example, you wanted to use the skb->priority fieid, define
* GET_SKBUFF_QOS as: #define GET_SKBUFF_QOS(skb) ((skb)->priority)
*/
#ifndef GET_SKBUFF_QOS
#define GET_SKBUFF_QOS(skb) 0
#endif
static inline int32_t cvm_oct_adjust_skb_to_free(int32_t skb_to_free, int fau)
{
int32_t undo;
undo = skb_to_free > 0 ? MAX_SKB_TO_FREE : skb_to_free + MAX_SKB_TO_FREE;
if (undo > 0)
cvmx_fau_atomic_add32(fau, -undo);
skb_to_free = -skb_to_free > MAX_SKB_TO_FREE ? MAX_SKB_TO_FREE : -skb_to_free;
return skb_to_free;
}
void cvm_oct_free_tx_skbs(struct octeon_ethernet *priv)
{
int32_t skb_to_free;
int qos, queues_per_port;
queues_per_port = cvmx_pko_get_num_queues(priv->port);
/* Drain any pending packets in the free list */
for (qos = 0; qos < queues_per_port; qos++) {
if (skb_queue_len(&priv->tx_free_list[qos]) == 0)
continue;
skb_to_free = cvmx_fau_fetch_and_add32(priv->fau+qos*4, MAX_SKB_TO_FREE);
skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, priv->fau+qos*4);
while (skb_to_free > 0) {
dev_kfree_skb_any(skb_dequeue(&priv->tx_free_list[qos]));
skb_to_free--;
}
}
}
enum hrtimer_restart cvm_oct_restart_tx(struct hrtimer *timer)
{
struct octeon_ethernet *priv = container_of(timer, struct octeon_ethernet, tx_restart_timer);
struct net_device *dev = cvm_oct_device[priv->port];
cvm_oct_free_tx_skbs(priv);
if (netif_queue_stopped(dev))
netif_wake_queue(dev);
return HRTIMER_NORESTART;
}
/**
* Packet transmit
*
* @skb: Packet to send
* @dev: Device info structure
* Returns Always returns zero
*/
int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev)
{
cvmx_pko_command_word0_t pko_command;
union cvmx_buf_ptr hw_buffer;
uint64_t old_scratch;
uint64_t old_scratch2;
int qos;
int i;
enum {QUEUE_CORE, QUEUE_HW, QUEUE_DROP} queue_type;
struct octeon_ethernet *priv = netdev_priv(dev);
struct sk_buff *to_free_list;
int32_t skb_to_free;
int32_t buffers_to_free;
unsigned long flags;
#if REUSE_SKBUFFS_WITHOUT_FREE
unsigned char *fpa_head;
#endif
/*
* Prefetch the private data structure. It is larger that one
* cache line.
*/
prefetch(priv);
/*
* The check on CVMX_PKO_QUEUES_PER_PORT_* is designed to
* completely remove "qos" in the event neither interface
* supports multiple queues per port.
*/
if ((CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 > 1) ||
(CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 > 1)) {
qos = GET_SKBUFF_QOS(skb);
if (qos <= 0)
qos = 0;
else if (qos >= cvmx_pko_get_num_queues(priv->port))
qos = 0;
} else
qos = 0;
if (USE_ASYNC_IOBDMA) {
/* Save scratch in case userspace is using it */
CVMX_SYNCIOBDMA;
old_scratch = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
old_scratch2 = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
/*
* Fetch and increment the number of packets to be
* freed.
*/
cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH + 8,
FAU_NUM_PACKET_BUFFERS_TO_FREE,
0);
cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,
priv->fau + qos * 4,
MAX_SKB_TO_FREE);
}
/*
* We have space for 6 segment pointers, If there will be more
* than that, we must linearize.
*/
if (unlikely(skb_shinfo(skb)->nr_frags > 5)) {
if (unlikely(__skb_linearize(skb))) {
queue_type = QUEUE_DROP;
if (USE_ASYNC_IOBDMA) {
/* Get the number of skbuffs in use by the hardware */
CVMX_SYNCIOBDMA;
skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
} else {
/* Get the number of skbuffs in use by the hardware */
skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
MAX_SKB_TO_FREE);
}
skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, priv->fau + qos * 4);
spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
goto skip_xmit;
}
}
/*
* The CN3XXX series of parts has an errata (GMX-401) which
* causes the GMX block to hang if a collision occurs towards
* the end of a <68 byte packet. As a workaround for this, we
* pad packets to be 68 bytes whenever we are in half duplex
* mode. We don't handle the case of having a small packet but
* no room to add the padding. The kernel should always give
* us at least a cache line
*/
if ((skb->len < 64) && OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
union cvmx_gmxx_prtx_cfg gmx_prt_cfg;
int interface = INTERFACE(priv->port);
int index = INDEX(priv->port);
if (interface < 2) {
/* We only need to pad packet in half duplex mode */
gmx_prt_cfg.u64 =
cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
if (gmx_prt_cfg.s.duplex == 0) {
int add_bytes = 64 - skb->len;
if ((skb_tail_pointer(skb) + add_bytes) <=
skb_end_pointer(skb))
memset(__skb_put(skb, add_bytes), 0,
add_bytes);
}
}
}
/* Build the PKO command */
pko_command.u64 = 0;
pko_command.s.n2 = 1; /* Don't pollute L2 with the outgoing packet */
pko_command.s.segs = 1;
pko_command.s.total_bytes = skb->len;
pko_command.s.size0 = CVMX_FAU_OP_SIZE_32;
pko_command.s.subone0 = 1;
pko_command.s.dontfree = 1;
pko_command.s.reg0 = priv->fau + qos * 4;
/* Build the PKO buffer pointer */
hw_buffer.u64 = 0;
if (skb_shinfo(skb)->nr_frags == 0) {
hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data);
hw_buffer.s.pool =<
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