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authorDavid Daney <ddaney@caviumnetworks.com>2009-05-05 17:35:21 -0700
committerRalf Baechle <ralf@linux-mips.org>2009-06-17 11:06:30 +0100
commit80ff0fd3ab6451407a20c19b80c1643c4a6d6434 (patch)
tree2d7021ac34269f0bce3ac18f7347bf6946640f36 /drivers/staging/octeon/ethernet-tx.c
parent38295fb2a09264671c82d490ce77c17d492378e0 (diff)
Staging: Add octeon-ethernet driver files.
The octeon-ethernet driver supports the sgmii, rgmii, spi, and xaui ports present on the Cavium OCTEON family of SOCs. These SOCs are multi-core mips64 processors with existing support over in arch/mips. The driver files can be categorized into three basic groups: 1) Register definitions, these are named cvmx-*-defs.h 2) Main driver code, these have names that don't start cvmx-. 3) Interface specific functions and other utility code, names starting with cvmx- Signed-off-by: David Daney <ddaney@caviumnetworks.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'drivers/staging/octeon/ethernet-tx.c')
-rw-r--r--drivers/staging/octeon/ethernet-tx.c634
1 files changed, 634 insertions, 0 deletions
diff --git a/drivers/staging/octeon/ethernet-tx.c b/drivers/staging/octeon/ethernet-tx.c
new file mode 100644
index 000000000000..77b7122c8fdb
--- /dev/null
+++ b/drivers/staging/octeon/ethernet-tx.c
@@ -0,0 +1,634 @@
+/*********************************************************************
+ * Author: Cavium Networks
+ *
+ * Contact: support@caviumnetworks.com
+ * This file is part of the OCTEON SDK
+ *
+ * Copyright (c) 2003-2007 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 <linux/ethtool.h>
+#include <linux/mii.h>
+#include <linux/seq_file.h>
+#include <linux/proc_fs.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-util.h"
+
+#include "cvmx-wqe.h"
+#include "cvmx-fau.h"
+#include "cvmx-pko.h"
+#include "cvmx-helper.h"
+
+#include "cvmx-gmxx-defs.h"
+
+/*
+ * 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
+
+/**
+ * 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 dropped;
+ int qos;
+ struct octeon_ethernet *priv = netdev_priv(dev);
+ int32_t in_use;
+ int32_t buffers_to_free;
+#if REUSE_SKBUFFS_WITHOUT_FREE
+ unsigned char *fpa_head;
+#endif
+
+ /*
+ * Prefetch the private data structure. It is larger that one
+ * cache line.
+ */
+ prefetch(priv);
+
+ /* Start off assuming no drop */
+ dropped = 0;
+
+ /*
+ * 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);
+
+ /*
+ * Assume we're going to be able t osend this
+ * packet. Fetch and increment the number of pending
+ * packets for output.
+ */
+ 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, 1);
+ }
+
+ /*
+ * 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 buffer pointer */
+ hw_buffer.u64 = 0;
+ hw_buffer.s.addr = cvmx_ptr_to_phys(skb->data);
+ hw_buffer.s.pool = 0;
+ hw_buffer.s.size =
+ (unsigned long)skb_end_pointer(skb) - (unsigned long)skb->head;
+
+ /* 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;
+ /*
+ * 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 get carried over when a
+ * buffer is reused, bad thing 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 + 128 - ((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_pointer(skb) - skb->head)) {
+ /*
+ 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.reg0 = 0;
+ pko_command.s.dontfree = 0;
+
+ hw_buffer.s.back = (skb->data - 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 Linux stuff.
+ */
+ dst_release(skb->dst);
+ skb->dst = 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 */
+
+dont_put_skbuff_in_hw:
+#endif /* REUSE_SKBUFFS_WITHOUT_FREE */
+
+ /* 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 == 1 << 14))
+ && ((ip_hdr(skb)->protocol == IP_PROTOCOL_TCP)
+ || (ip_hdr(skb)->protocol == IP_PROTOCOL_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;
+ in_use = 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 */
+ in_use = cvmx_fau_fetch_and_add32(priv->fau + qos * 4, 1);
+ buffers_to_free =
+ cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);
+ }
+
+ /*
+ * 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;
+ pko_command.s.reg0 = priv->fau + qos * 4;
+ }
+
+ cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos,
+ CVMX_PKO_LOCK_CMD_QUEUE);
+
+ /* 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)) {
+ /*
+ DEBUGPRINT("%s: Tx dropped. Too many queued\n", dev->name);
+ */
+ dropped = 1;
+ }
+ /* Send the packet to the output queue */
+ else if (unlikely
+ (cvmx_pko_send_packet_finish
+ (priv->port, priv->queue + qos, pko_command, hw_buffer,
+ CVMX_PKO_LOCK_CMD_QUEUE))) {
+ DEBUGPRINT("%s: Failed to send the packet\n", dev->name);
+ dropped = 1;
+ }
+
+ if (USE_ASYNC_IOBDMA) {
+ /* Restore the scratch area */
+ cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch);
+ cvmx_scratch_write64(CVMX_SCR_SCRATCH + 8, old_scratch2);
+ }
+
+ if (unlikely(dropped)) {
+ dev_kfree_skb_any(skb);
+ cvmx_fau_atomic_add32(priv->fau + qos * 4, -1);
+ priv->stats.tx_dropped++;
+ } else {
+ if (USE_SKBUFFS_IN_HW) {
+ /* Put this packet on the queue to be freed later */
+ if (pko_command.s.dontfree)
+ skb_queue_tail(&priv->tx_free_list[qos], skb);
+ else {
+ cvmx_fau_atomic_add32
+ (FAU_NUM_PACKET_BUFFERS_TO_FREE, -1);
+ cvmx_fau_atomic_add32(priv->fau + qos * 4, -1);
+ }
+ } else {
+ /* Put this packet on the queue to be freed later */
+ skb_queue_tail(&priv->tx_free_list[qos], skb);
+ }
+ }
+
+ /* Free skbuffs not in use by the hardware, possibly two at a time */
+ if (skb_queue_len(&priv->tx_free_list[qos]) > in_use) {
+ spin_lock(&priv->tx_free_list[qos].lock);
+ /*
+ * Check again now that we have the lock. It might
+ * have changed.
+ */
+ if (skb_queue_len(&priv->tx_free_list[qos]) > in_use)
+ dev_kfree_skb(__skb_dequeue(&priv->tx_free_list[qos]));
+ if (skb_queue_len(&priv->tx_free_list[qos]) > in_use)
+ dev_kfree_skb(__skb_dequeue(&priv->tx_free_list[qos]));
+ spin_unlock(&priv->tx_free_list[qos].lock);
+ }
+
+ return 0;
+}
+
+/**
+ * Packet transmit 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)) {
+ DEBUGPRINT("%s: Failed to allocate a work queue entry\n",
+ dev->name);
+ priv->stats.tx_dropped++;
+ dev_kfree_skb(skb);
+ return 0;
+ }
+
+ /* Get a packet buffer */
+ packet_buffer = cvmx_fpa_alloc(CVMX_FPA_PACKET_POOL);
+ if (unlikely(packet_buffer == NULL)) {
+ DEBUGPRINT("%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(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 == IP_PROTOCOL_TCP)
+ || (ip_hdr(skb)->protocol == IP_PROTOCOL_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_kfree_skb(skb);
+ return 0;
+}
+
+/**
+ * Transmit a work queue entry out of the ethernet port. Both
+ * the work queue entry and the packet data can optionally be
+ * freed. The work will be freed on error as well.
+ *
+ * @dev: Device to transmit out.
+ * @work_queue_entry:
+ * Work queue entry to send
+ * @do_free: True if the work queue entry and packet data should be
+ * freed. If false, neither will be freed.
+ * @qos: Index into the queues for this port to transmit on. This
+ * is used to implement QoS if their are multiple queues per
+ * port. This parameter must be between 0 and the number of
+ * queues per port minus 1. Values outside of this range will
+ * be change to zero.
+ *
+ * Returns Zero on success, negative on failure.
+ */
+int cvm_oct_transmit_qos(struct net_device *dev, void *work_queue_entry,
+ int do_free, int qos)
+{
+ unsigned long flags;
+ union cvmx_buf_ptr hw_buffer;
+ cvmx_pko_command_word0_t pko_command;
+ int dropped;
+ struct octeon_ethernet *priv = netdev_priv(dev);
+ cvmx_wqe_t *work = work_queue_entry;
+
+ if (!(dev->flags & IFF_UP)) {
+ DEBUGPRINT("%s: Device not up\n", dev->name);
+ if (do_free)
+ cvm_oct_free_work(work);
+ return -1;
+ }
+
+ /* 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)) {
+ if (qos <= 0)
+ qos = 0;
+ else if (qos >= cvmx_pko_get_num_queues(priv->port))
+ qos = 0;
+ } else
+ qos = 0;
+
+ /* Start off assuming no drop */
+ dropped = 0;
+
+ local_irq_save(flags);
+ cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos,
+ CVMX_PKO_LOCK_CMD_QUEUE);
+
+ /* Build the PKO buffer pointer */
+ hw_buffer.u64 = 0;
+ hw_buffer.s.addr = work->packet_ptr.s.addr;
+ hw_buffer.s.pool = CVMX_FPA_PACKET_POOL;
+ hw_buffer.s.size = CVMX_FPA_PACKET_POOL_SIZE;
+ hw_buffer.s.back = work->packet_ptr.s.back;
+
+ /* Build the PKO command */
+ pko_command.u64 = 0;
+ pko_command.s.n2 = 1; /* Don't pollute L2 with the outgoing packet */
+ pko_command.s.dontfree = !do_free;
+ pko_command.s.segs = work->word2.s.bufs;
+ pko_command.s.total_bytes = work->len;
+
+ /* Check if we can use the hardware checksumming */
+ if (unlikely(work->word2.s.not_IP || work->word2.s.IP_exc))
+ pko_command.s.ipoffp1 = 0;
+ else
+ pko_command.s.ipoffp1 = sizeof(struct ethhdr) + 1;
+
+ /* 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_CMD_QUEUE))) {
+ DEBUGPRINT("%s: Failed to send the packet\n", dev->name);
+ dropped = -1;
+ }
+ local_irq_restore(flags);
+
+ if (unlikely(dropped)) {
+ if (do_free)
+ cvm_oct_free_work(work);
+ priv->stats.tx_dropped++;
+ } else if (do_free)
+ cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, DONT_WRITEBACK(1));
+
+ return dropped;
+}
+EXPORT_SYMBOL(cvm_oct_transmit_qos);
+
+/**
+ * This function frees all skb that are currenty queued for TX.
+ *
+ * @dev: Device being shutdown
+ */
+void cvm_oct_tx_shutdown(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);
+ }
+}

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