![Julia Lawall](/assets/img/avatar_default.png)
Drop cast on the result of kmalloc and similar functions. The semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ type T; @@ - (T *) (\(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\| kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\)(...)) // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
798 lines
22 KiB
C
798 lines
22 KiB
C
/*
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* Agere Systems Inc.
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* 10/100/1000 Base-T Ethernet Driver for the ET1301 and ET131x series MACs
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*
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* Copyright © 2005 Agere Systems Inc.
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* All rights reserved.
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* http://www.agere.com
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*
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*------------------------------------------------------------------------------
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*
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* et1310_tx.c - Routines used to perform data transmission.
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*
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*------------------------------------------------------------------------------
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*
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* SOFTWARE LICENSE
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*
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* This software is provided subject to the following terms and conditions,
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* which you should read carefully before using the software. Using this
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* software indicates your acceptance of these terms and conditions. If you do
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* not agree with these terms and conditions, do not use the software.
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*
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* Copyright © 2005 Agere Systems Inc.
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* All rights reserved.
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*
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* Redistribution and use in source or binary forms, with or without
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* modifications, are permitted provided that the following conditions are met:
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*
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* . Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following Disclaimer as comments in the code as
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* well as in the documentation and/or other materials provided with the
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* distribution.
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*
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* . Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following Disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* . Neither the name of Agere Systems Inc. nor the names of the contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* Disclaimer
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*
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* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, INFRINGEMENT AND THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. ANY
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* USE, MODIFICATION OR DISTRIBUTION OF THIS SOFTWARE IS SOLELY AT THE USERS OWN
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* RISK. IN NO EVENT SHALL AGERE SYSTEMS INC. OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, INCLUDING, BUT NOT LIMITED TO, CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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*/
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#include "et131x_version.h"
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#include "et131x_defs.h"
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/ptrace.h>
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#include <linux/slab.h>
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#include <linux/ctype.h>
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#include <linux/string.h>
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#include <linux/timer.h>
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#include <linux/interrupt.h>
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#include <linux/in.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/bitops.h>
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#include <asm/system.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/if_arp.h>
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#include <linux/ioport.h>
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#include "et1310_phy.h"
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#include "et131x_adapter.h"
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#include "et1310_tx.h"
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#include "et131x.h"
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static inline void et131x_free_send_packet(struct et131x_adapter *etdev,
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struct tcb *tcb);
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static int et131x_send_packet(struct sk_buff *skb,
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struct et131x_adapter *etdev);
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static int nic_send_packet(struct et131x_adapter *etdev, struct tcb *tcb);
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/**
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* et131x_tx_dma_memory_alloc
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* @adapter: pointer to our private adapter structure
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*
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* Returns 0 on success and errno on failure (as defined in errno.h).
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*
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* Allocates memory that will be visible both to the device and to the CPU.
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* The OS will pass us packets, pointers to which we will insert in the Tx
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* Descriptor queue. The device will read this queue to find the packets in
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* memory. The device will update the "status" in memory each time it xmits a
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* packet.
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*/
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int et131x_tx_dma_memory_alloc(struct et131x_adapter *adapter)
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{
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int desc_size = 0;
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struct tx_ring *tx_ring = &adapter->tx_ring;
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/* Allocate memory for the TCB's (Transmit Control Block) */
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adapter->tx_ring.tcb_ring =
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kcalloc(NUM_TCB, sizeof(struct tcb), GFP_ATOMIC | GFP_DMA);
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if (!adapter->tx_ring.tcb_ring) {
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dev_err(&adapter->pdev->dev, "Cannot alloc memory for TCBs\n");
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return -ENOMEM;
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}
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/* Allocate enough memory for the Tx descriptor ring, and allocate
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* some extra so that the ring can be aligned on a 4k boundary.
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*/
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desc_size = (sizeof(struct tx_desc) * NUM_DESC_PER_RING_TX) + 4096 - 1;
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tx_ring->tx_desc_ring =
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(struct tx_desc *) pci_alloc_consistent(adapter->pdev, desc_size,
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&tx_ring->tx_desc_ring_pa);
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if (!adapter->tx_ring.tx_desc_ring) {
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dev_err(&adapter->pdev->dev,
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"Cannot alloc memory for Tx Ring\n");
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return -ENOMEM;
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}
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/* Save physical address
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*
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* NOTE: pci_alloc_consistent(), used above to alloc DMA regions,
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* ALWAYS returns SAC (32-bit) addresses. If DAC (64-bit) addresses
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* are ever returned, make sure the high part is retrieved here before
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* storing the adjusted address.
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*/
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/* Allocate memory for the Tx status block */
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tx_ring->tx_status = pci_alloc_consistent(adapter->pdev,
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sizeof(u32),
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&tx_ring->tx_status_pa);
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if (!adapter->tx_ring.tx_status_pa) {
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dev_err(&adapter->pdev->dev,
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"Cannot alloc memory for Tx status block\n");
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return -ENOMEM;
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}
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return 0;
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}
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/**
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* et131x_tx_dma_memory_free - Free all memory allocated within this module
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* @adapter: pointer to our private adapter structure
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*
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* Returns 0 on success and errno on failure (as defined in errno.h).
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*/
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void et131x_tx_dma_memory_free(struct et131x_adapter *adapter)
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{
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int desc_size = 0;
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if (adapter->tx_ring.tx_desc_ring) {
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/* Free memory relating to Tx rings here */
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desc_size = (sizeof(struct tx_desc) * NUM_DESC_PER_RING_TX)
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+ 4096 - 1;
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pci_free_consistent(adapter->pdev,
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desc_size,
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adapter->tx_ring.tx_desc_ring,
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adapter->tx_ring.tx_desc_ring_pa);
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adapter->tx_ring.tx_desc_ring = NULL;
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}
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/* Free memory for the Tx status block */
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if (adapter->tx_ring.tx_status) {
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pci_free_consistent(adapter->pdev,
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sizeof(u32),
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adapter->tx_ring.tx_status,
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adapter->tx_ring.tx_status_pa);
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adapter->tx_ring.tx_status = NULL;
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}
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/* Free the memory for the tcb structures */
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kfree(adapter->tx_ring.tcb_ring);
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}
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/**
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* ConfigTxDmaRegs - Set up the tx dma section of the JAGCore.
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* @etdev: pointer to our private adapter structure
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*
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* Configure the transmit engine with the ring buffers we have created
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* and prepare it for use.
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*/
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void ConfigTxDmaRegs(struct et131x_adapter *etdev)
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{
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struct txdma_regs __iomem *txdma = &etdev->regs->txdma;
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/* Load the hardware with the start of the transmit descriptor ring. */
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writel((u32) ((u64)etdev->tx_ring.tx_desc_ring_pa >> 32),
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&txdma->pr_base_hi);
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writel((u32) etdev->tx_ring.tx_desc_ring_pa,
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&txdma->pr_base_lo);
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/* Initialise the transmit DMA engine */
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writel(NUM_DESC_PER_RING_TX - 1, &txdma->pr_num_des);
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/* Load the completion writeback physical address */
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writel((u32)((u64)etdev->tx_ring.tx_status_pa >> 32),
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&txdma->dma_wb_base_hi);
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writel((u32)etdev->tx_ring.tx_status_pa, &txdma->dma_wb_base_lo);
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*etdev->tx_ring.tx_status = 0;
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writel(0, &txdma->service_request);
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etdev->tx_ring.send_idx = 0;
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}
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/**
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* et131x_tx_dma_disable - Stop of Tx_DMA on the ET1310
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* @etdev: pointer to our adapter structure
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*/
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void et131x_tx_dma_disable(struct et131x_adapter *etdev)
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{
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/* Setup the tramsmit dma configuration register */
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writel(ET_TXDMA_CSR_HALT|ET_TXDMA_SNGL_EPKT,
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&etdev->regs->txdma.csr);
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}
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/**
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* et131x_tx_dma_enable - re-start of Tx_DMA on the ET1310.
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* @etdev: pointer to our adapter structure
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*
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* Mainly used after a return to the D0 (full-power) state from a lower state.
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*/
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void et131x_tx_dma_enable(struct et131x_adapter *etdev)
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{
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/* Setup the transmit dma configuration register for normal
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* operation
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*/
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writel(ET_TXDMA_SNGL_EPKT|(PARM_DMA_CACHE_DEF << ET_TXDMA_CACHE_SHIFT),
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&etdev->regs->txdma.csr);
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}
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/**
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* et131x_init_send - Initialize send data structures
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* @adapter: pointer to our private adapter structure
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*/
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void et131x_init_send(struct et131x_adapter *adapter)
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{
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struct tcb *tcb;
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u32 ct;
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struct tx_ring *tx_ring;
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/* Setup some convenience pointers */
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tx_ring = &adapter->tx_ring;
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tcb = adapter->tx_ring.tcb_ring;
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tx_ring->tcb_qhead = tcb;
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memset(tcb, 0, sizeof(struct tcb) * NUM_TCB);
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/* Go through and set up each TCB */
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for (ct = 0; ct++ < NUM_TCB; tcb++)
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/* Set the link pointer in HW TCB to the next TCB in the
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* chain
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*/
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tcb->next = tcb + 1;
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/* Set the tail pointer */
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tcb--;
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tx_ring->tcb_qtail = tcb;
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tcb->next = NULL;
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/* Curr send queue should now be empty */
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tx_ring->send_head = NULL;
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tx_ring->send_tail = NULL;
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}
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/**
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* et131x_send_packets - This function is called by the OS to send packets
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* @skb: the packet(s) to send
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* @netdev:device on which to TX the above packet(s)
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*
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* Return 0 in almost all cases; non-zero value in extreme hard failure only
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*/
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int et131x_send_packets(struct sk_buff *skb, struct net_device *netdev)
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{
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int status = 0;
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struct et131x_adapter *etdev = NULL;
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etdev = netdev_priv(netdev);
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/* Send these packets
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*
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* NOTE: The Linux Tx entry point is only given one packet at a time
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* to Tx, so the PacketCount and it's array used makes no sense here
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*/
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/* TCB is not available */
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if (etdev->tx_ring.used >= NUM_TCB) {
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/* NOTE: If there's an error on send, no need to queue the
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* packet under Linux; if we just send an error up to the
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* netif layer, it will resend the skb to us.
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*/
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status = -ENOMEM;
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} else {
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/* We need to see if the link is up; if it's not, make the
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* netif layer think we're good and drop the packet
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*/
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if ((etdev->Flags & fMP_ADAPTER_FAIL_SEND_MASK) ||
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!netif_carrier_ok(netdev)) {
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dev_kfree_skb_any(skb);
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skb = NULL;
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etdev->net_stats.tx_dropped++;
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} else {
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status = et131x_send_packet(skb, etdev);
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if (status != 0 && status != -ENOMEM) {
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/* On any other error, make netif think we're
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* OK and drop the packet
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*/
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dev_kfree_skb_any(skb);
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skb = NULL;
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etdev->net_stats.tx_dropped++;
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}
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}
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}
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return status;
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}
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/**
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* et131x_send_packet - Do the work to send a packet
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* @skb: the packet(s) to send
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* @etdev: a pointer to the device's private adapter structure
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*
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* Return 0 in almost all cases; non-zero value in extreme hard failure only.
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*
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* Assumption: Send spinlock has been acquired
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*/
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static int et131x_send_packet(struct sk_buff *skb,
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struct et131x_adapter *etdev)
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{
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int status;
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struct tcb *tcb = NULL;
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u16 *shbufva;
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unsigned long flags;
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/* All packets must have at least a MAC address and a protocol type */
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if (skb->len < ETH_HLEN)
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return -EIO;
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/* Get a TCB for this packet */
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spin_lock_irqsave(&etdev->TCBReadyQLock, flags);
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tcb = etdev->tx_ring.tcb_qhead;
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if (tcb == NULL) {
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spin_unlock_irqrestore(&etdev->TCBReadyQLock, flags);
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return -ENOMEM;
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}
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etdev->tx_ring.tcb_qhead = tcb->next;
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if (etdev->tx_ring.tcb_qhead == NULL)
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etdev->tx_ring.tcb_qtail = NULL;
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spin_unlock_irqrestore(&etdev->TCBReadyQLock, flags);
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tcb->skb = skb;
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if (skb->data != NULL && skb->len - skb->data_len >= 6) {
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shbufva = (u16 *) skb->data;
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if ((shbufva[0] == 0xffff) &&
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(shbufva[1] == 0xffff) && (shbufva[2] == 0xffff)) {
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tcb->flags |= fMP_DEST_BROAD;
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} else if ((shbufva[0] & 0x3) == 0x0001) {
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tcb->flags |= fMP_DEST_MULTI;
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}
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}
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tcb->next = NULL;
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/* Call the NIC specific send handler. */
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status = nic_send_packet(etdev, tcb);
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if (status != 0) {
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spin_lock_irqsave(&etdev->TCBReadyQLock, flags);
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if (etdev->tx_ring.tcb_qtail)
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etdev->tx_ring.tcb_qtail->next = tcb;
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else
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/* Apparently ready Q is empty. */
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etdev->tx_ring.tcb_qhead = tcb;
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etdev->tx_ring.tcb_qtail = tcb;
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spin_unlock_irqrestore(&etdev->TCBReadyQLock, flags);
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return status;
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}
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WARN_ON(etdev->tx_ring.used > NUM_TCB);
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return 0;
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}
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/**
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* nic_send_packet - NIC specific send handler for version B silicon.
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* @etdev: pointer to our adapter
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* @tcb: pointer to struct tcb
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*
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* Returns 0 or errno.
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*/
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static int nic_send_packet(struct et131x_adapter *etdev, struct tcb *tcb)
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{
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u32 i;
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struct tx_desc desc[24]; /* 24 x 16 byte */
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u32 frag = 0;
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u32 thiscopy, remainder;
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struct sk_buff *skb = tcb->skb;
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u32 nr_frags = skb_shinfo(skb)->nr_frags + 1;
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struct skb_frag_struct *frags = &skb_shinfo(skb)->frags[0];
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unsigned long flags;
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/* Part of the optimizations of this send routine restrict us to
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* sending 24 fragments at a pass. In practice we should never see
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* more than 5 fragments.
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*
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* NOTE: The older version of this function (below) can handle any
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* number of fragments. If needed, we can call this function,
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* although it is less efficient.
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*/
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if (nr_frags > 23)
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return -EIO;
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memset(desc, 0, sizeof(struct tx_desc) * (nr_frags + 1));
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for (i = 0; i < nr_frags; i++) {
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/* If there is something in this element, lets get a
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* descriptor from the ring and get the necessary data
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*/
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if (i == 0) {
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/* If the fragments are smaller than a standard MTU,
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* then map them to a single descriptor in the Tx
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* Desc ring. However, if they're larger, as is
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* possible with support for jumbo packets, then
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* split them each across 2 descriptors.
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*
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* This will work until we determine why the hardware
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* doesn't seem to like large fragments.
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*/
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if ((skb->len - skb->data_len) <= 1514) {
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desc[frag].addr_hi = 0;
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/* Low 16bits are length, high is vlan and
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unused currently so zero */
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desc[frag].len_vlan =
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skb->len - skb->data_len;
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/* NOTE: Here, the dma_addr_t returned from
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* pci_map_single() is implicitly cast as a
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* u32. Although dma_addr_t can be
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* 64-bit, the address returned by
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* pci_map_single() is always 32-bit
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* addressable (as defined by the pci/dma
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* subsystem)
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*/
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desc[frag++].addr_lo =
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pci_map_single(etdev->pdev,
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skb->data,
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skb->len -
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skb->data_len,
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PCI_DMA_TODEVICE);
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} else {
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desc[frag].addr_hi = 0;
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desc[frag].len_vlan =
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(skb->len - skb->data_len) / 2;
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/* NOTE: Here, the dma_addr_t returned from
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* pci_map_single() is implicitly cast as a
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* u32. Although dma_addr_t can be
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* 64-bit, the address returned by
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* pci_map_single() is always 32-bit
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* addressable (as defined by the pci/dma
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* subsystem)
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*/
|
|
desc[frag++].addr_lo =
|
|
pci_map_single(etdev->pdev,
|
|
skb->data,
|
|
((skb->len -
|
|
skb->data_len) / 2),
|
|
PCI_DMA_TODEVICE);
|
|
desc[frag].addr_hi = 0;
|
|
|
|
desc[frag].len_vlan =
|
|
(skb->len - skb->data_len) / 2;
|
|
|
|
/* NOTE: Here, the dma_addr_t returned from
|
|
* pci_map_single() is implicitly cast as a
|
|
* u32. Although dma_addr_t can be
|
|
* 64-bit, the address returned by
|
|
* pci_map_single() is always 32-bit
|
|
* addressable (as defined by the pci/dma
|
|
* subsystem)
|
|
*/
|
|
desc[frag++].addr_lo =
|
|
pci_map_single(etdev->pdev,
|
|
skb->data +
|
|
((skb->len -
|
|
skb->data_len) / 2),
|
|
((skb->len -
|
|
skb->data_len) / 2),
|
|
PCI_DMA_TODEVICE);
|
|
}
|
|
} else {
|
|
desc[frag].addr_hi = 0;
|
|
desc[frag].len_vlan =
|
|
frags[i - 1].size;
|
|
|
|
/* NOTE: Here, the dma_addr_t returned from
|
|
* pci_map_page() is implicitly cast as a u32.
|
|
* Although dma_addr_t can be 64-bit, the address
|
|
* returned by pci_map_page() is always 32-bit
|
|
* addressable (as defined by the pci/dma subsystem)
|
|
*/
|
|
desc[frag++].addr_lo =
|
|
pci_map_page(etdev->pdev,
|
|
frags[i - 1].page,
|
|
frags[i - 1].page_offset,
|
|
frags[i - 1].size,
|
|
PCI_DMA_TODEVICE);
|
|
}
|
|
}
|
|
|
|
if (frag == 0)
|
|
return -EIO;
|
|
|
|
if (etdev->linkspeed == TRUEPHY_SPEED_1000MBPS) {
|
|
if (++etdev->tx_ring.since_irq == PARM_TX_NUM_BUFS_DEF) {
|
|
/* Last element & Interrupt flag */
|
|
desc[frag - 1].flags = 0x5;
|
|
etdev->tx_ring.since_irq = 0;
|
|
} else { /* Last element */
|
|
desc[frag - 1].flags = 0x1;
|
|
}
|
|
} else
|
|
desc[frag - 1].flags = 0x5;
|
|
|
|
desc[0].flags |= 2; /* First element flag */
|
|
|
|
tcb->index_start = etdev->tx_ring.send_idx;
|
|
tcb->stale = 0;
|
|
|
|
spin_lock_irqsave(&etdev->SendHWLock, flags);
|
|
|
|
thiscopy = NUM_DESC_PER_RING_TX -
|
|
INDEX10(etdev->tx_ring.send_idx);
|
|
|
|
if (thiscopy >= frag) {
|
|
remainder = 0;
|
|
thiscopy = frag;
|
|
} else {
|
|
remainder = frag - thiscopy;
|
|
}
|
|
|
|
memcpy(etdev->tx_ring.tx_desc_ring +
|
|
INDEX10(etdev->tx_ring.send_idx), desc,
|
|
sizeof(struct tx_desc) * thiscopy);
|
|
|
|
add_10bit(&etdev->tx_ring.send_idx, thiscopy);
|
|
|
|
if (INDEX10(etdev->tx_ring.send_idx) == 0 ||
|
|
INDEX10(etdev->tx_ring.send_idx) == NUM_DESC_PER_RING_TX) {
|
|
etdev->tx_ring.send_idx &= ~ET_DMA10_MASK;
|
|
etdev->tx_ring.send_idx ^= ET_DMA10_WRAP;
|
|
}
|
|
|
|
if (remainder) {
|
|
memcpy(etdev->tx_ring.tx_desc_ring,
|
|
desc + thiscopy,
|
|
sizeof(struct tx_desc) * remainder);
|
|
|
|
add_10bit(&etdev->tx_ring.send_idx, remainder);
|
|
}
|
|
|
|
if (INDEX10(etdev->tx_ring.send_idx) == 0) {
|
|
if (etdev->tx_ring.send_idx)
|
|
tcb->index = NUM_DESC_PER_RING_TX - 1;
|
|
else
|
|
tcb->index = ET_DMA10_WRAP|(NUM_DESC_PER_RING_TX - 1);
|
|
} else
|
|
tcb->index = etdev->tx_ring.send_idx - 1;
|
|
|
|
spin_lock(&etdev->TCBSendQLock);
|
|
|
|
if (etdev->tx_ring.send_tail)
|
|
etdev->tx_ring.send_tail->next = tcb;
|
|
else
|
|
etdev->tx_ring.send_head = tcb;
|
|
|
|
etdev->tx_ring.send_tail = tcb;
|
|
|
|
WARN_ON(tcb->next != NULL);
|
|
|
|
etdev->tx_ring.used++;
|
|
|
|
spin_unlock(&etdev->TCBSendQLock);
|
|
|
|
/* Write the new write pointer back to the device. */
|
|
writel(etdev->tx_ring.send_idx,
|
|
&etdev->regs->txdma.service_request);
|
|
|
|
/* For Gig only, we use Tx Interrupt coalescing. Enable the software
|
|
* timer to wake us up if this packet isn't followed by N more.
|
|
*/
|
|
if (etdev->linkspeed == TRUEPHY_SPEED_1000MBPS) {
|
|
writel(PARM_TX_TIME_INT_DEF * NANO_IN_A_MICRO,
|
|
&etdev->regs->global.watchdog_timer);
|
|
}
|
|
spin_unlock_irqrestore(&etdev->SendHWLock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* et131x_free_send_packet - Recycle a struct tcb
|
|
* @etdev: pointer to our adapter
|
|
* @tcb: pointer to struct tcb
|
|
*
|
|
* Complete the packet if necessary
|
|
* Assumption - Send spinlock has been acquired
|
|
*/
|
|
inline void et131x_free_send_packet(struct et131x_adapter *etdev,
|
|
struct tcb *tcb)
|
|
{
|
|
unsigned long flags;
|
|
struct tx_desc *desc = NULL;
|
|
struct net_device_stats *stats = &etdev->net_stats;
|
|
|
|
if (tcb->flags & fMP_DEST_BROAD)
|
|
atomic_inc(&etdev->Stats.brdcstxmt);
|
|
else if (tcb->flags & fMP_DEST_MULTI)
|
|
atomic_inc(&etdev->Stats.multixmt);
|
|
else
|
|
atomic_inc(&etdev->Stats.unixmt);
|
|
|
|
if (tcb->skb) {
|
|
stats->tx_bytes += tcb->skb->len;
|
|
|
|
/* Iterate through the TX descriptors on the ring
|
|
* corresponding to this packet and umap the fragments
|
|
* they point to
|
|
*/
|
|
do {
|
|
desc = (struct tx_desc *)(etdev->tx_ring.tx_desc_ring +
|
|
INDEX10(tcb->index_start));
|
|
|
|
pci_unmap_single(etdev->pdev,
|
|
desc->addr_lo,
|
|
desc->len_vlan, PCI_DMA_TODEVICE);
|
|
|
|
add_10bit(&tcb->index_start, 1);
|
|
if (INDEX10(tcb->index_start) >=
|
|
NUM_DESC_PER_RING_TX) {
|
|
tcb->index_start &= ~ET_DMA10_MASK;
|
|
tcb->index_start ^= ET_DMA10_WRAP;
|
|
}
|
|
} while (desc != (etdev->tx_ring.tx_desc_ring +
|
|
INDEX10(tcb->index)));
|
|
|
|
dev_kfree_skb_any(tcb->skb);
|
|
}
|
|
|
|
memset(tcb, 0, sizeof(struct tcb));
|
|
|
|
/* Add the TCB to the Ready Q */
|
|
spin_lock_irqsave(&etdev->TCBReadyQLock, flags);
|
|
|
|
etdev->Stats.opackets++;
|
|
|
|
if (etdev->tx_ring.tcb_qtail)
|
|
etdev->tx_ring.tcb_qtail->next = tcb;
|
|
else
|
|
/* Apparently ready Q is empty. */
|
|
etdev->tx_ring.tcb_qhead = tcb;
|
|
|
|
etdev->tx_ring.tcb_qtail = tcb;
|
|
|
|
spin_unlock_irqrestore(&etdev->TCBReadyQLock, flags);
|
|
WARN_ON(etdev->tx_ring.used < 0);
|
|
}
|
|
|
|
/**
|
|
* et131x_free_busy_send_packets - Free and complete the stopped active sends
|
|
* @etdev: pointer to our adapter
|
|
*
|
|
* Assumption - Send spinlock has been acquired
|
|
*/
|
|
void et131x_free_busy_send_packets(struct et131x_adapter *etdev)
|
|
{
|
|
struct tcb *tcb;
|
|
unsigned long flags;
|
|
u32 freed = 0;
|
|
|
|
/* Any packets being sent? Check the first TCB on the send list */
|
|
spin_lock_irqsave(&etdev->TCBSendQLock, flags);
|
|
|
|
tcb = etdev->tx_ring.send_head;
|
|
|
|
while (tcb != NULL && freed < NUM_TCB) {
|
|
struct tcb *next = tcb->next;
|
|
|
|
etdev->tx_ring.send_head = next;
|
|
|
|
if (next == NULL)
|
|
etdev->tx_ring.send_tail = NULL;
|
|
|
|
etdev->tx_ring.used--;
|
|
|
|
spin_unlock_irqrestore(&etdev->TCBSendQLock, flags);
|
|
|
|
freed++;
|
|
et131x_free_send_packet(etdev, tcb);
|
|
|
|
spin_lock_irqsave(&etdev->TCBSendQLock, flags);
|
|
|
|
tcb = etdev->tx_ring.send_head;
|
|
}
|
|
|
|
WARN_ON(freed == NUM_TCB);
|
|
|
|
spin_unlock_irqrestore(&etdev->TCBSendQLock, flags);
|
|
|
|
etdev->tx_ring.used = 0;
|
|
}
|
|
|
|
/**
|
|
* et131x_handle_send_interrupt - Interrupt handler for sending processing
|
|
* @etdev: pointer to our adapter
|
|
*
|
|
* Re-claim the send resources, complete sends and get more to send from
|
|
* the send wait queue.
|
|
*
|
|
* Assumption - Send spinlock has been acquired
|
|
*/
|
|
void et131x_handle_send_interrupt(struct et131x_adapter *etdev)
|
|
{
|
|
unsigned long flags;
|
|
u32 serviced;
|
|
struct tcb *tcb;
|
|
u32 index;
|
|
|
|
serviced = readl(&etdev->regs->txdma.NewServiceComplete);
|
|
index = INDEX10(serviced);
|
|
|
|
/* Has the ring wrapped? Process any descriptors that do not have
|
|
* the same "wrap" indicator as the current completion indicator
|
|
*/
|
|
spin_lock_irqsave(&etdev->TCBSendQLock, flags);
|
|
|
|
tcb = etdev->tx_ring.send_head;
|
|
|
|
while (tcb &&
|
|
((serviced ^ tcb->index) & ET_DMA10_WRAP) &&
|
|
index < INDEX10(tcb->index)) {
|
|
etdev->tx_ring.used--;
|
|
etdev->tx_ring.send_head = tcb->next;
|
|
if (tcb->next == NULL)
|
|
etdev->tx_ring.send_tail = NULL;
|
|
|
|
spin_unlock_irqrestore(&etdev->TCBSendQLock, flags);
|
|
et131x_free_send_packet(etdev, tcb);
|
|
spin_lock_irqsave(&etdev->TCBSendQLock, flags);
|
|
|
|
/* Goto the next packet */
|
|
tcb = etdev->tx_ring.send_head;
|
|
}
|
|
while (tcb &&
|
|
!((serviced ^ tcb->index) & ET_DMA10_WRAP)
|
|
&& index > (tcb->index & ET_DMA10_MASK)) {
|
|
etdev->tx_ring.used--;
|
|
etdev->tx_ring.send_head = tcb->next;
|
|
if (tcb->next == NULL)
|
|
etdev->tx_ring.send_tail = NULL;
|
|
|
|
spin_unlock_irqrestore(&etdev->TCBSendQLock, flags);
|
|
et131x_free_send_packet(etdev, tcb);
|
|
spin_lock_irqsave(&etdev->TCBSendQLock, flags);
|
|
|
|
/* Goto the next packet */
|
|
tcb = etdev->tx_ring.send_head;
|
|
}
|
|
|
|
/* Wake up the queue when we hit a low-water mark */
|
|
if (etdev->tx_ring.used <= NUM_TCB / 3)
|
|
netif_wake_queue(etdev->netdev);
|
|
|
|
spin_unlock_irqrestore(&etdev->TCBSendQLock, flags);
|
|
}
|
|
|