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Several devices have multiple independant RX queues per net device, and some have a single interrupt doorbell for several queues. In either case, it's easier to support layouts like that if the structure representing the poll is independant from the net device itself. The signature of the ->poll() call back goes from: int foo_poll(struct net_device *dev, int *budget) to int foo_poll(struct napi_struct *napi, int budget) The caller is returned the number of RX packets processed (or the number of "NAPI credits" consumed if you want to get abstract). The callee no longer messes around bumping dev->quota, *budget, etc. because that is all handled in the caller upon return. The napi_struct is to be embedded in the device driver private data structures. Furthermore, it is the driver's responsibility to disable all NAPI instances in it's ->stop() device close handler. Since the napi_struct is privatized into the driver's private data structures, only the driver knows how to get at all of the napi_struct instances it may have per-device. With lots of help and suggestions from Rusty Russell, Roland Dreier, Michael Chan, Jeff Garzik, and Jamal Hadi Salim. Bug fixes from Thomas Graf, Roland Dreier, Peter Zijlstra, Joseph Fannin, Scott Wood, Hans J. Koch, and Michael Chan. [ Ported to current tree and all drivers converted. Integrated Stephen's follow-on kerneldoc additions, and restored poll_list handling to the old style to fix mutual exclusion issues. -DaveM ] Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
200 lines
5.5 KiB
C
200 lines
5.5 KiB
C
/*******************************************************************************
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Intel PRO/10GbE Linux driver
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Copyright(c) 1999 - 2006 Intel Corporation.
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This program is free software; you can redistribute it and/or modify it
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under the terms and conditions of the GNU General Public License,
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version 2, as published by the Free Software Foundation.
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This program is distributed in the hope it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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The full GNU General Public License is included in this distribution in
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the file called "COPYING".
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Contact Information:
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Linux NICS <linux.nics@intel.com>
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e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
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Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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*******************************************************************************/
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#ifndef _IXGB_H_
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#define _IXGB_H_
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#include <linux/stddef.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <asm/byteorder.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/errno.h>
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#include <linux/ioport.h>
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#include <linux/pci.h>
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#include <linux/kernel.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/delay.h>
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#include <linux/timer.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/interrupt.h>
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#include <linux/string.h>
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#include <linux/pagemap.h>
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#include <linux/dma-mapping.h>
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#include <linux/bitops.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <linux/capability.h>
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#include <linux/in.h>
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#include <linux/ip.h>
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#include <linux/tcp.h>
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#include <linux/udp.h>
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#include <net/pkt_sched.h>
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#include <linux/list.h>
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#include <linux/reboot.h>
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#include <net/checksum.h>
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#include <linux/ethtool.h>
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#include <linux/if_vlan.h>
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#define BAR_0 0
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#define BAR_1 1
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#define BAR_5 5
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struct ixgb_adapter;
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#include "ixgb_hw.h"
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#include "ixgb_ee.h"
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#include "ixgb_ids.h"
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#ifdef _DEBUG_DRIVER_
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#define IXGB_DBG(args...) printk(KERN_DEBUG "ixgb: " args)
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#else
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#define IXGB_DBG(args...)
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#endif
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#define PFX "ixgb: "
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#define DPRINTK(nlevel, klevel, fmt, args...) \
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(void)((NETIF_MSG_##nlevel & adapter->msg_enable) && \
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printk(KERN_##klevel PFX "%s: %s: " fmt, adapter->netdev->name, \
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__FUNCTION__ , ## args))
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/* TX/RX descriptor defines */
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#define DEFAULT_TXD 256
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#define MAX_TXD 4096
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#define MIN_TXD 64
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/* hardware cannot reliably support more than 512 descriptors owned by
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* hardware descrioptor cache otherwise an unreliable ring under heavy
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* recieve load may result */
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/* #define DEFAULT_RXD 1024 */
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/* #define MAX_RXD 4096 */
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#define DEFAULT_RXD 512
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#define MAX_RXD 512
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#define MIN_RXD 64
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/* Supported Rx Buffer Sizes */
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#define IXGB_RXBUFFER_2048 2048
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#define IXGB_RXBUFFER_4096 4096
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#define IXGB_RXBUFFER_8192 8192
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#define IXGB_RXBUFFER_16384 16384
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/* How many Rx Buffers do we bundle into one write to the hardware ? */
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#define IXGB_RX_BUFFER_WRITE 8 /* Must be power of 2 */
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/* wrapper around a pointer to a socket buffer,
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* so a DMA handle can be stored along with the buffer */
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struct ixgb_buffer {
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struct sk_buff *skb;
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dma_addr_t dma;
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unsigned long time_stamp;
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uint16_t length;
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uint16_t next_to_watch;
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};
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struct ixgb_desc_ring {
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/* pointer to the descriptor ring memory */
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void *desc;
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/* physical address of the descriptor ring */
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dma_addr_t dma;
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/* length of descriptor ring in bytes */
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unsigned int size;
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/* number of descriptors in the ring */
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unsigned int count;
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/* next descriptor to associate a buffer with */
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unsigned int next_to_use;
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/* next descriptor to check for DD status bit */
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unsigned int next_to_clean;
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/* array of buffer information structs */
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struct ixgb_buffer *buffer_info;
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};
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#define IXGB_DESC_UNUSED(R) \
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((((R)->next_to_clean > (R)->next_to_use) ? 0 : (R)->count) + \
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(R)->next_to_clean - (R)->next_to_use - 1)
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#define IXGB_GET_DESC(R, i, type) (&(((struct type *)((R).desc))[i]))
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#define IXGB_RX_DESC(R, i) IXGB_GET_DESC(R, i, ixgb_rx_desc)
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#define IXGB_TX_DESC(R, i) IXGB_GET_DESC(R, i, ixgb_tx_desc)
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#define IXGB_CONTEXT_DESC(R, i) IXGB_GET_DESC(R, i, ixgb_context_desc)
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/* board specific private data structure */
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struct ixgb_adapter {
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struct timer_list watchdog_timer;
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struct vlan_group *vlgrp;
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uint32_t bd_number;
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uint32_t rx_buffer_len;
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uint32_t part_num;
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uint16_t link_speed;
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uint16_t link_duplex;
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spinlock_t tx_lock;
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atomic_t irq_sem;
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struct work_struct tx_timeout_task;
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struct timer_list blink_timer;
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unsigned long led_status;
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/* TX */
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struct ixgb_desc_ring tx_ring ____cacheline_aligned_in_smp;
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unsigned int restart_queue;
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unsigned long timeo_start;
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uint32_t tx_cmd_type;
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uint64_t hw_csum_tx_good;
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uint64_t hw_csum_tx_error;
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uint32_t tx_int_delay;
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uint32_t tx_timeout_count;
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boolean_t tx_int_delay_enable;
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boolean_t detect_tx_hung;
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/* RX */
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struct ixgb_desc_ring rx_ring;
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uint64_t hw_csum_rx_error;
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uint64_t hw_csum_rx_good;
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uint32_t rx_int_delay;
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boolean_t rx_csum;
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/* OS defined structs */
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struct napi_struct napi;
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struct net_device *netdev;
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struct pci_dev *pdev;
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struct net_device_stats net_stats;
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/* structs defined in ixgb_hw.h */
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struct ixgb_hw hw;
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u16 msg_enable;
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struct ixgb_hw_stats stats;
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uint32_t alloc_rx_buff_failed;
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boolean_t have_msi;
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};
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#endif /* _IXGB_H_ */
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