--- /dev/null
+/*********************************************************************
+ * 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/etherdevice.h>
+#include <linux/ip.h>
+#include <linux/ratelimit.h>
+#include <linux/string.h>
+#include <linux/interrupt.h>
+#include <net/dst.h>
+#ifdef CONFIG_XFRM
+#include <linux/xfrm.h>
+#include <net/xfrm.h>
+#endif /* CONFIG_XFRM */
+
+#include <linux/atomic.h>
+
+#include <asm/octeon/octeon.h>
+
+#include "ethernet-defines.h"
+#include "octeon-ethernet.h"
+#include "ethernet-tx.h"
+#include "ethernet-util.h"
+
+#include <asm/octeon/cvmx-wqe.h>
+#include <asm/octeon/cvmx-fau.h>
+#include <asm/octeon/cvmx-pip.h>
+#include <asm/octeon/cvmx-pko.h>
+#include <asm/octeon/cvmx-helper.h>
+
+#include <asm/octeon/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 field, define
+ * GET_SKBUFF_QOS as: #define GET_SKBUFF_QOS(skb) ((skb)->priority)
+ */
+#ifndef GET_SKBUFF_QOS
+#define GET_SKBUFF_QOS(skb) 0
+#endif
+
+static void cvm_oct_tx_do_cleanup(unsigned long arg);
+static DECLARE_TASKLET(cvm_oct_tx_cleanup_tasklet, cvm_oct_tx_do_cleanup, 0);
+
+/* Maximum number of SKBs to try to free per xmit packet. */
+#define MAX_SKB_TO_FREE (MAX_OUT_QUEUE_DEPTH * 2)
+
+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;
+}
+
+static void cvm_oct_kick_tx_poll_watchdog(void)
+{
+ union cvmx_ciu_timx ciu_timx;
+
+ ciu_timx.u64 = 0;
+ ciu_timx.s.one_shot = 1;
+ ciu_timx.s.len = cvm_oct_tx_poll_interval;
+ cvmx_write_csr(CVMX_CIU_TIMX(1), ciu_timx.u64);
+}
+
+static void cvm_oct_free_tx_skbs(struct net_device *dev)
+{
+ int32_t skb_to_free;
+ int qos, queues_per_port;
+ int total_freed = 0;
+ int total_remaining = 0;
+ unsigned long flags;
+ struct octeon_ethernet *priv = netdev_priv(dev);
+
+ 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);
+
+
+ total_freed += skb_to_free;
+ if (skb_to_free > 0) {
+ struct sk_buff *to_free_list = NULL;
+
+ spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
+ while (skb_to_free > 0) {
+ struct sk_buff *t;
+
+ t = __skb_dequeue(&priv->tx_free_list[qos]);
+ t->next = to_free_list;
+ to_free_list = t;
+ skb_to_free--;
+ }
+ spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
+ flags);
+ /* Do the actual freeing outside of the lock. */
+ while (to_free_list) {
+ struct sk_buff *t = to_free_list;
+
+ to_free_list = to_free_list->next;
+ dev_kfree_skb_any(t);
+ }
+ }
+ total_remaining += skb_queue_len(&priv->tx_free_list[qos]);
+ }
+ if (total_freed >= 0 && netif_queue_stopped(dev))
+ netif_wake_queue(dev);
+ if (total_remaining)
+ cvm_oct_kick_tx_poll_watchdog();
+}
+
+/**
+ * cvm_oct_xmit - transmit a packet
+ * @skb: Packet to send
+ * @dev: Device info structure
+ *
+ * Returns Always returns NETDEV_TX_OK
+ */
+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;
+ u32 total_to_clean;
+ unsigned long flags;
+#if REUSE_SKBUFFS_WITHOUT_FREE
+ unsigned char *fpa_head;
+#endif
+
+ /*
+ * Prefetch the private data structure. It is larger than the
+ * 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;
+#ifdef __LITTLE_ENDIAN
+ pko_command.s.le = 1;
+#endif
+ 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;
+
+ /* 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 = 0;
+ hw_buffer.s.size = skb->len;
+ } else {
+ hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data);
+ hw_buffer.s.pool = 0;
+ hw_buffer.s.size = skb_headlen(skb);
+ CVM_OCT_SKB_CB(skb)[0] = hw_buffer.u64;
+ for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
+ struct skb_frag_struct *fs = skb_shinfo(skb)->frags + i;
+
+ hw_buffer.s.addr = XKPHYS_TO_PHYS(
+ (u64)(page_address(fs->page.p) +
+ fs->page_offset));
+ hw_buffer.s.size = fs->size;
+ CVM_OCT_SKB_CB(skb)[i + 1] = hw_buffer.u64;
+ }
+ hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)CVM_OCT_SKB_CB(skb));
+ hw_buffer.s.size = skb_shinfo(skb)->nr_frags + 1;
+ pko_command.s.segs = skb_shinfo(skb)->nr_frags + 1;
+ pko_command.s.gather = 1;
+ goto dont_put_skbuff_in_hw;
+ }
+
+ /*
+ * See if we can put this skb in the FPA pool. Any strange
+ * behavior from the Linux networking stack will most likely
+ * be caused by a bug in the following code. If some field is
+ * in use by the network stack and gets carried over when a
+ * buffer is reused, bad things may happen. If in doubt and
+ * you dont need the absolute best performance, disable the
+ * define REUSE_SKBUFFS_WITHOUT_FREE. The reuse of buffers has
+ * shown a 25% increase in performance under some loads.
+ */
+#if REUSE_SKBUFFS_WITHOUT_FREE
+ fpa_head = skb->head + 256 - ((unsigned long)skb->head & 0x7f);
+ if (unlikely(skb->data < fpa_head)) {
+ /*
+ * printk("TX buffer beginning can't meet FPA
+ * alignment constraints\n");
+ */
+ goto dont_put_skbuff_in_hw;
+ }
+ if (unlikely
+ ((skb_end_pointer(skb) - fpa_head) < CVMX_FPA_PACKET_POOL_SIZE)) {
+ /*
+ printk("TX buffer isn't large enough for the FPA\n");
+ */
+ goto dont_put_skbuff_in_hw;
+ }
+ if (unlikely(skb_shared(skb))) {
+ /*
+ printk("TX buffer sharing data with someone else\n");
+ */
+ goto dont_put_skbuff_in_hw;
+ }
+ if (unlikely(skb_cloned(skb))) {
+ /*
+ printk("TX buffer has been cloned\n");
+ */
+ goto dont_put_skbuff_in_hw;
+ }
+ if (unlikely(skb_header_cloned(skb))) {
+ /*
+ printk("TX buffer header has been cloned\n");
+ */
+ goto dont_put_skbuff_in_hw;
+ }
+ if (unlikely(skb->destructor)) {
+ /*
+ printk("TX buffer has a destructor\n");
+ */
+ goto dont_put_skbuff_in_hw;
+ }
+ if (unlikely(skb_shinfo(skb)->nr_frags)) {
+ /*
+ printk("TX buffer has fragments\n");
+ */
+ goto dont_put_skbuff_in_hw;
+ }
+ if (unlikely
+ (skb->truesize !=
+ sizeof(*skb) + skb_end_offset(skb))) {
+ /*
+ printk("TX buffer truesize has been changed\n");
+ */
+ goto dont_put_skbuff_in_hw;
+ }
+
+ /*
+ * We can use this buffer in the FPA. We don't need the FAU
+ * update anymore
+ */
+ pko_command.s.dontfree = 0;
+
+ hw_buffer.s.back = ((unsigned long)skb->data >> 7) -
+ ((unsigned long)fpa_head >> 7);
+
+ *(struct sk_buff **)(fpa_head - sizeof(void *)) = skb;
+
+ /*
+ * The skbuff will be reused without ever being freed. We must
+ * cleanup a bunch of core things.
+ */
+ dst_release(skb_dst(skb));
+ skb_dst_set(skb, NULL);
+#ifdef CONFIG_XFRM
+ secpath_put(skb->sp);
+ skb->sp = NULL;
+#endif
+ nf_reset(skb);
+
+#ifdef CONFIG_NET_SCHED
+ skb->tc_index = 0;
+#ifdef CONFIG_NET_CLS_ACT
+ skb->tc_verd = 0;
+#endif /* CONFIG_NET_CLS_ACT */
+#endif /* CONFIG_NET_SCHED */
+#endif /* REUSE_SKBUFFS_WITHOUT_FREE */
+
+dont_put_skbuff_in_hw:
+
+ /* Check if we can use the hardware checksumming */
+ if (USE_HW_TCPUDP_CHECKSUM && (skb->protocol == htons(ETH_P_IP)) &&
+ (ip_hdr(skb)->version == 4) && (ip_hdr(skb)->ihl == 5) &&
+ ((ip_hdr(skb)->frag_off == 0) || (ip_hdr(skb)->frag_off == htons(1 << 14)))
+ && ((ip_hdr(skb)->protocol == IPPROTO_TCP)
+ || (ip_hdr(skb)->protocol == IPPROTO_UDP))) {
+ /* Use hardware checksum calc */
+ pko_command.s.ipoffp1 = sizeof(struct ethhdr) + 1;
+ }
+
+ 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);
+ buffers_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
+ } 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);
+ buffers_to_free =
+ cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);
+ }
+
+ skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, priv->fau+qos*4);
+
+ /*
+ * If we're sending faster than the receive can free them then
+ * don't do the HW free.
+ */
+ if ((buffers_to_free < -100) && !pko_command.s.dontfree)
+ pko_command.s.dontfree = 1;
+
+ if (pko_command.s.dontfree) {
+ queue_type = QUEUE_CORE;
+ pko_command.s.reg0 = priv->fau+qos*4;
+ } else {
+ queue_type = QUEUE_HW;
+ }
+ if (USE_ASYNC_IOBDMA)
+ cvmx_fau_async_fetch_and_add32(
+ CVMX_SCR_SCRATCH, FAU_TOTAL_TX_TO_CLEAN, 1);
+
+ spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
+
+ /* Drop this packet if we have too many already queued to the HW */
+ if (unlikely(skb_queue_len(&priv->tx_free_list[qos]) >=
+ MAX_OUT_QUEUE_DEPTH)) {
+
+ if (dev->tx_queue_len != 0) {
+ /* Drop the lock when notifying the core. */
+ spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
+ flags);
+ netif_stop_queue(dev);
+ spin_lock_irqsave(&priv->tx_free_list[qos].lock,
+ flags);
+ } else {
+ /* If not using normal queueing. */
+ queue_type = QUEUE_DROP;
+ goto skip_xmit;
+ }
+ }
+
+ cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos,
+ CVMX_PKO_LOCK_NONE);
+
+ /* Send the packet to the output queue */
+ if (unlikely(cvmx_pko_send_packet_finish(priv->port,
+ priv->queue + qos,
+ pko_command, hw_buffer,
+ CVMX_PKO_LOCK_NONE))) {
+ printk_ratelimited("%s: Failed to send the packet\n",
+ dev->name);
+ queue_type = QUEUE_DROP;
+ }
+skip_xmit:
+ to_free_list = NULL;
+
+ switch (queue_type) {
+ case QUEUE_DROP:
+ skb->next = to_free_list;
+ to_free_list = skb;
+ priv->stats.tx_dropped++;
+ break;
+ case QUEUE_HW:
+ cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, -1);
+ break;
+ case QUEUE_CORE:
+ __skb_queue_tail(&priv->tx_free_list[qos], skb);
+ break;
+ default:
+ BUG();
+ }
+
+ while (skb_to_free > 0) {
+ struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]);
+
+ t->next = to_free_list;
+ to_free_list = t;
+ skb_to_free--;
+ }
+
+ spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
+
+ /* Do the actual freeing outside of the lock. */
+ while (to_free_list) {
+ struct sk_buff *t = to_free_list;
+
+ to_free_list = to_free_list->next;
+ dev_kfree_skb_any(t);
+ }
+
+ if (USE_ASYNC_IOBDMA) {
+ CVMX_SYNCIOBDMA;
+ total_to_clean = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
+ /* Restore the scratch area */
+ cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch);
+ cvmx_scratch_write64(CVMX_SCR_SCRATCH + 8, old_scratch2);
+ } else {
+ total_to_clean = cvmx_fau_fetch_and_add32(
+ FAU_TOTAL_TX_TO_CLEAN, 1);
+ }
+
+ if (total_to_clean & 0x3ff) {
+ /*
+ * Schedule the cleanup tasklet every 1024 packets for
+ * the pathological case of high traffic on one port
+ * delaying clean up of packets on a different port
+ * that is blocked waiting for the cleanup.
+ */
+ tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
+ }
+
+ cvm_oct_kick_tx_poll_watchdog();
+
+ return NETDEV_TX_OK;
+}
+
+/**
+ * cvm_oct_xmit_pow - transmit a packet to the POW
+ * @skb: Packet to send
+ * @dev: Device info structure
+
+ * Returns Always returns zero
+ */
+int cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev)
+{
+ struct octeon_ethernet *priv = netdev_priv(dev);
+ void *packet_buffer;
+ void *copy_location;
+
+ /* Get a work queue entry */
+ cvmx_wqe_t *work = cvmx_fpa_alloc(CVMX_FPA_WQE_POOL);
+
+ if (unlikely(work == NULL)) {
+ printk_ratelimited("%s: Failed to allocate a work queue entry\n",
+ dev->name);
+ priv->stats.tx_dropped++;
+ dev_kfree_skb_any(skb);
+ return 0;
+ }
+
+ /* Get a packet buffer */
+ packet_buffer = cvmx_fpa_alloc(CVMX_FPA_PACKET_POOL);
+ if (unlikely(packet_buffer == NULL)) {
+ printk_ratelimited("%s: Failed to allocate a packet buffer\n",
+ dev->name);
+ cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, DONT_WRITEBACK(1));
+ priv->stats.tx_dropped++;
+ dev_kfree_skb_any(skb);
+ return 0;
+ }
+
+ /*
+ * Calculate where we need to copy the data to. We need to
+ * leave 8 bytes for a next pointer (unused). We also need to
+ * include any configure skip. Then we need to align the IP
+ * packet src and dest into the same 64bit word. The below
+ * calculation may add a little extra, but that doesn't
+ * hurt.
+ */
+ copy_location = packet_buffer + sizeof(uint64_t);
+ copy_location += ((CVMX_HELPER_FIRST_MBUFF_SKIP + 7) & 0xfff8) + 6;
+
+ /*
+ * We have to copy the packet since whoever processes this
+ * packet will free it to a hardware pool. We can't use the
+ * trick of counting outstanding packets like in
+ * cvm_oct_xmit.
+ */
+ memcpy(copy_location, skb->data, skb->len);
+
+ /*
+ * Fill in some of the work queue fields. We may need to add
+ * more if the software at the other end needs them.
+ */
+ work->hw_chksum = skb->csum;
+ work->len = skb->len;
+ work->ipprt = priv->port;
+ work->qos = priv->port & 0x7;
+ work->grp = pow_send_group;
+ work->tag_type = CVMX_HELPER_INPUT_TAG_TYPE;
+ work->tag = pow_send_group; /* FIXME */
+ /* Default to zero. Sets of zero later are commented out */
+ work->word2.u64 = 0;
+ work->word2.s.bufs = 1;
+ work->packet_ptr.u64 = 0;
+ work->packet_ptr.s.addr = cvmx_ptr_to_phys(copy_location);
+ work->packet_ptr.s.pool = CVMX_FPA_PACKET_POOL;
+ work->packet_ptr.s.size = CVMX_FPA_PACKET_POOL_SIZE;
+ work->packet_ptr.s.back = (copy_location - packet_buffer) >> 7;
+
+ if (skb->protocol == htons(ETH_P_IP)) {
+ work->word2.s.ip_offset = 14;
+#if 0
+ work->word2.s.vlan_valid = 0; /* FIXME */
+ work->word2.s.vlan_cfi = 0; /* FIXME */
+ work->word2.s.vlan_id = 0; /* FIXME */
+ work->word2.s.dec_ipcomp = 0; /* FIXME */
+#endif
+ work->word2.s.tcp_or_udp =
+ (ip_hdr(skb)->protocol == IPPROTO_TCP)
+ || (ip_hdr(skb)->protocol == IPPROTO_UDP);
+#if 0
+ /* FIXME */
+ work->word2.s.dec_ipsec = 0;
+ /* We only support IPv4 right now */
+ work->word2.s.is_v6 = 0;
+ /* Hardware would set to zero */
+ work->word2.s.software = 0;
+ /* No error, packet is internal */
+ work->word2.s.L4_error = 0;
+#endif
+ work->word2.s.is_frag = !((ip_hdr(skb)->frag_off == 0)
+ || (ip_hdr(skb)->frag_off ==
+ 1 << 14));
+#if 0
+ /* Assume Linux is sending a good packet */
+ work->word2.s.IP_exc = 0;
+#endif
+ work->word2.s.is_bcast = (skb->pkt_type == PACKET_BROADCAST);
+ work->word2.s.is_mcast = (skb->pkt_type == PACKET_MULTICAST);
+#if 0
+ /* This is an IP packet */
+ work->word2.s.not_IP = 0;
+ /* No error, packet is internal */
+ work->word2.s.rcv_error = 0;
+ /* No error, packet is internal */
+ work->word2.s.err_code = 0;
+#endif
+
+ /*
+ * When copying the data, include 4 bytes of the
+ * ethernet header to align the same way hardware
+ * does.
+ */
+ memcpy(work->packet_data, skb->data + 10,
+ sizeof(work->packet_data));
+ } else {
+#if 0
+ work->word2.snoip.vlan_valid = 0; /* FIXME */
+ work->word2.snoip.vlan_cfi = 0; /* FIXME */
+ work->word2.snoip.vlan_id = 0; /* FIXME */
+ work->word2.snoip.software = 0; /* Hardware would set to zero */
+#endif
+ work->word2.snoip.is_rarp = skb->protocol == htons(ETH_P_RARP);
+ work->word2.snoip.is_arp = skb->protocol == htons(ETH_P_ARP);
+ work->word2.snoip.is_bcast =
+ (skb->pkt_type == PACKET_BROADCAST);
+ work->word2.snoip.is_mcast =
+ (skb->pkt_type == PACKET_MULTICAST);
+ work->word2.snoip.not_IP = 1; /* IP was done up above */
+#if 0
+ /* No error, packet is internal */
+ work->word2.snoip.rcv_error = 0;
+ /* No error, packet is internal */
+ work->word2.snoip.err_code = 0;
+#endif
+ memcpy(work->packet_data, skb->data, sizeof(work->packet_data));
+ }
+
+ /* Submit the packet to the POW */
+ cvmx_pow_work_submit(work, work->tag, work->tag_type, work->qos,
+ work->grp);
+ priv->stats.tx_packets++;
+ priv->stats.tx_bytes += skb->len;
+ dev_consume_skb_any(skb);
+ return 0;
+}
+
+/**
+ * cvm_oct_tx_shutdown_dev - free all skb that are currently queued for TX.
+ * @dev: Device being shutdown
+ *
+ */
+void cvm_oct_tx_shutdown_dev(struct net_device *dev)
+{
+ struct octeon_ethernet *priv = netdev_priv(dev);
+ unsigned long flags;
+ int qos;
+
+ for (qos = 0; qos < 16; qos++) {
+ spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
+ while (skb_queue_len(&priv->tx_free_list[qos]))
+ dev_kfree_skb_any(__skb_dequeue
+ (&priv->tx_free_list[qos]));
+ spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
+ }
+}
+
+static void cvm_oct_tx_do_cleanup(unsigned long arg)
+{
+ int port;
+
+ for (port = 0; port < TOTAL_NUMBER_OF_PORTS; port++) {
+ if (cvm_oct_device[port]) {
+ struct net_device *dev = cvm_oct_device[port];
+
+ cvm_oct_free_tx_skbs(dev);
+ }
+ }
+}
+
+static irqreturn_t cvm_oct_tx_cleanup_watchdog(int cpl, void *dev_id)
+{
+ /* Disable the interrupt. */
+ cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
+ /* Do the work in the tasklet. */
+ tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
+ return IRQ_HANDLED;
+}
+
+void cvm_oct_tx_initialize(void)
+{
+ int i;
+
+ /* Disable the interrupt. */
+ cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
+ /* Register an IRQ handler to receive CIU_TIMX(1) interrupts */
+ i = request_irq(OCTEON_IRQ_TIMER1,
+ cvm_oct_tx_cleanup_watchdog, 0,
+ "Ethernet", cvm_oct_device);
+
+ if (i)
+ panic("Could not acquire Ethernet IRQ %d\n", OCTEON_IRQ_TIMER1);
+}
+
+void cvm_oct_tx_shutdown(void)
+{
+ /* Free the interrupt handler */
+ free_irq(OCTEON_IRQ_TIMER1, cvm_oct_device);
+}
Code Review / kvmfornfv.git / blobdiff