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ixgbe: Introduce adaptive interrupt moderation
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1/*******************************************************************************
2
3 Intel 10 Gigabit PCI Express Linux driver
4 Copyright(c) 1999 - 2007 Intel Corporation.
5
6 This program is free software; you can redistribute it and/or modify it
7 under the terms and conditions of the GNU General Public License,
8 version 2, as published by the Free Software Foundation.
9
10 This program is distributed in the hope it will be useful, but WITHOUT
11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 more details.
14
15 You should have received a copy of the GNU General Public License along with
16 this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18
19 The full GNU General Public License is included in this distribution in
20 the file called "COPYING".
21
22 Contact Information:
23 Linux NICS <linux.nics@intel.com>
24 e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
25 Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
26
27*******************************************************************************/
28
29#ifndef _IXGBE_H_
30#define _IXGBE_H_
31
32#include <linux/types.h>
33#include <linux/pci.h>
34#include <linux/netdevice.h>
35
36#include "ixgbe_type.h"
37#include "ixgbe_common.h"
38
39
40#define IXGBE_ERR(args...) printk(KERN_ERR "ixgbe: " args)
41
42#define PFX "ixgbe: "
43#define DPRINTK(nlevel, klevel, fmt, args...) \
44 ((void)((NETIF_MSG_##nlevel & adapter->msg_enable) && \
45 printk(KERN_##klevel PFX "%s: %s: " fmt, adapter->netdev->name, \
46 __FUNCTION__ , ## args)))
47
48/* TX/RX descriptor defines */
49#define IXGBE_DEFAULT_TXD 1024
50#define IXGBE_MAX_TXD 4096
51#define IXGBE_MIN_TXD 64
52
53#define IXGBE_DEFAULT_RXD 1024
54#define IXGBE_MAX_RXD 4096
55#define IXGBE_MIN_RXD 64
56
57#define IXGBE_DEFAULT_RXQ 1
58#define IXGBE_MAX_RXQ 1
59#define IXGBE_MIN_RXQ 1
60
61#define IXGBE_DEFAULT_ITR_RX_USECS 125 /* 8k irqs/sec */
62#define IXGBE_DEFAULT_ITR_TX_USECS 250 /* 4k irqs/sec */
63#define IXGBE_MIN_ITR_USECS 100 /* 500k irqs/sec */
64#define IXGBE_MAX_ITR_USECS 10000 /* 100 irqs/sec */
65
66/* flow control */
67#define IXGBE_DEFAULT_FCRTL 0x10000
68#define IXGBE_MIN_FCRTL 0
69#define IXGBE_MAX_FCRTL 0x7FF80
70#define IXGBE_DEFAULT_FCRTH 0x20000
71#define IXGBE_MIN_FCRTH 0
72#define IXGBE_MAX_FCRTH 0x7FFF0
73#define IXGBE_DEFAULT_FCPAUSE 0x6800 /* may be too long */
74#define IXGBE_MIN_FCPAUSE 0
75#define IXGBE_MAX_FCPAUSE 0xFFFF
76
77/* Supported Rx Buffer Sizes */
78#define IXGBE_RXBUFFER_64 64 /* Used for packet split */
79#define IXGBE_RXBUFFER_128 128 /* Used for packet split */
80#define IXGBE_RXBUFFER_256 256 /* Used for packet split */
81#define IXGBE_RXBUFFER_2048 2048
82
83#define IXGBE_RX_HDR_SIZE IXGBE_RXBUFFER_256
84
85#define MAXIMUM_ETHERNET_VLAN_SIZE (ETH_FRAME_LEN + ETH_FCS_LEN + VLAN_HLEN)
86
87/* How many Tx Descriptors do we need to call netif_wake_queue? */
88#define IXGBE_TX_QUEUE_WAKE 16
89
90/* How many Rx Buffers do we bundle into one write to the hardware ? */
91#define IXGBE_RX_BUFFER_WRITE 16 /* Must be power of 2 */
92
93#define IXGBE_TX_FLAGS_CSUM (u32)(1)
94#define IXGBE_TX_FLAGS_VLAN (u32)(1 << 1)
95#define IXGBE_TX_FLAGS_TSO (u32)(1 << 2)
96#define IXGBE_TX_FLAGS_IPV4 (u32)(1 << 3)
97#define IXGBE_TX_FLAGS_VLAN_MASK 0xffff0000
98#define IXGBE_TX_FLAGS_VLAN_SHIFT 16
99
100/* wrapper around a pointer to a socket buffer,
101 * so a DMA handle can be stored along with the buffer */
102struct ixgbe_tx_buffer {
103 struct sk_buff *skb;
104 dma_addr_t dma;
105 unsigned long time_stamp;
106 u16 length;
107 u16 next_to_watch;
108};
109
110struct ixgbe_rx_buffer {
111 struct sk_buff *skb;
112 dma_addr_t dma;
113 struct page *page;
114 dma_addr_t page_dma;
115};
116
117struct ixgbe_queue_stats {
118 u64 packets;
119 u64 bytes;
120};
121
122struct ixgbe_ring {
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123 void *desc; /* descriptor ring memory */
124 dma_addr_t dma; /* phys. address of descriptor ring */
125 unsigned int size; /* length in bytes */
126 unsigned int count; /* amount of descriptors */
127 unsigned int next_to_use;
128 unsigned int next_to_clean;
129
021230d4 130 int queue_index; /* needed for multiqueue queue management */
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131 union {
132 struct ixgbe_tx_buffer *tx_buffer_info;
133 struct ixgbe_rx_buffer *rx_buffer_info;
134 };
135
136 u16 head;
137 u16 tail;
138
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139 unsigned int total_bytes;
140 unsigned int total_packets;
9a799d71 141
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142 u16 reg_idx; /* holds the special value that gets the hardware register
143 * offset associated with this ring, which is different
144 * for DCE and RSS modes */
9a799d71 145 struct ixgbe_queue_stats stats;
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146 u8 v_idx; /* maps directly to the index for this ring in the hardware
147 * vector array, can also be used for finding the bit in EICR
148 * and friends that represents the vector for this ring */
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149
150 u32 eims_value;
151 u16 itr_register;
152
153 char name[IFNAMSIZ + 5];
154 u16 work_limit; /* max work per interrupt */
155};
156
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157#define RING_F_VMDQ 1
158#define RING_F_RSS 2
159#define IXGBE_MAX_RSS_INDICES 16
160#define IXGBE_MAX_VMDQ_INDICES 16
161struct ixgbe_ring_feature {
162 int indices;
163 int mask;
164};
165
166#define MAX_RX_QUEUES 64
167#define MAX_TX_QUEUES 32
168
169/* MAX_MSIX_Q_VECTORS of these are allocated,
170 * but we only use one per queue-specific vector.
171 */
172struct ixgbe_q_vector {
173 struct ixgbe_adapter *adapter;
174 struct napi_struct napi;
175 DECLARE_BITMAP(rxr_idx, MAX_RX_QUEUES); /* Rx ring indices */
176 DECLARE_BITMAP(txr_idx, MAX_TX_QUEUES); /* Tx ring indices */
177 u8 rxr_count; /* Rx ring count assigned to this vector */
178 u8 txr_count; /* Tx ring count assigned to this vector */
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179 u8 tx_eitr;
180 u8 rx_eitr;
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181 u32 eitr;
182};
183
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184/* Helper macros to switch between ints/sec and what the register uses.
185 * And yes, it's the same math going both ways.
186 */
187#define EITR_INTS_PER_SEC_TO_REG(_eitr) \
188 ((_eitr) ? (1000000000 / ((_eitr) * 256)) : 0)
189#define EITR_REG_TO_INTS_PER_SEC EITR_INTS_PER_SEC_TO_REG
190
191#define IXGBE_DESC_UNUSED(R) \
192 ((((R)->next_to_clean > (R)->next_to_use) ? 0 : (R)->count) + \
193 (R)->next_to_clean - (R)->next_to_use - 1)
194
195#define IXGBE_RX_DESC_ADV(R, i) \
196 (&(((union ixgbe_adv_rx_desc *)((R).desc))[i]))
197#define IXGBE_TX_DESC_ADV(R, i) \
198 (&(((union ixgbe_adv_tx_desc *)((R).desc))[i]))
199#define IXGBE_TX_CTXTDESC_ADV(R, i) \
200 (&(((struct ixgbe_adv_tx_context_desc *)((R).desc))[i]))
201
202#define IXGBE_MAX_JUMBO_FRAME_SIZE 16128
203
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204#define OTHER_VECTOR 1
205#define NON_Q_VECTORS (OTHER_VECTOR)
206
207#define MAX_MSIX_Q_VECTORS 16
208#define MIN_MSIX_Q_VECTORS 2
209#define MAX_MSIX_COUNT (MAX_MSIX_Q_VECTORS + NON_Q_VECTORS)
210#define MIN_MSIX_COUNT (MIN_MSIX_Q_VECTORS + NON_Q_VECTORS)
211
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212/* board specific private data structure */
213struct ixgbe_adapter {
214 struct timer_list watchdog_timer;
215 struct vlan_group *vlgrp;
216 u16 bd_number;
217 u16 rx_buf_len;
9a799d71 218 struct work_struct reset_task;
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219 struct ixgbe_q_vector q_vector[MAX_MSIX_Q_VECTORS];
220 char name[MAX_MSIX_COUNT][IFNAMSIZ + 5];
9a799d71 221
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222 /* Interrupt Throttle Rate */
223 u32 itr_setting;
224 u16 eitr_low;
225 u16 eitr_high;
226
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227 /* TX */
228 struct ixgbe_ring *tx_ring; /* One per active queue */
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229 u64 restart_queue;
230 u64 lsc_int;
231 u64 hw_tso_ctxt;
232 u64 hw_tso6_ctxt;
233 u32 tx_timeout_count;
234 bool detect_tx_hung;
235
236 /* RX */
237 struct ixgbe_ring *rx_ring; /* One per active queue */
238 u64 hw_csum_tx_good;
239 u64 hw_csum_rx_error;
240 u64 hw_csum_rx_good;
241 u64 non_eop_descs;
242 int num_tx_queues;
243 int num_rx_queues;
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244 int num_msix_vectors;
245 struct ixgbe_ring_feature ring_feature[3];
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246 struct msix_entry *msix_entries;
247
248 u64 rx_hdr_split;
249 u32 alloc_rx_page_failed;
250 u32 alloc_rx_buff_failed;
251
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252 /* Some features need tri-state capability,
253 * thus the additional *_CAPABLE flags.
254 */
9a799d71 255 u32 flags;
021230d4 256#define IXGBE_FLAG_RX_CSUM_ENABLED (u32)(1 << 0)
9a799d71 257#define IXGBE_FLAG_MSI_ENABLED (u32)(1 << 1)
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258#define IXGBE_FLAG_MSIX_ENABLED (u32)(1 << 2)
259#define IXGBE_FLAG_RX_PS_ENABLED (u32)(1 << 3)
260#define IXGBE_FLAG_IN_NETPOLL (u32)(1 << 4)
261#define IXGBE_FLAG_IMIR_ENABLED (u32)(1 << 5)
262#define IXGBE_FLAG_RSS_ENABLED (u32)(1 << 6)
263#define IXGBE_FLAG_VMDQ_ENABLED (u32)(1 << 7)
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264
265 /* OS defined structs */
266 struct net_device *netdev;
267 struct pci_dev *pdev;
268 struct net_device_stats net_stats;
269
270 /* structs defined in ixgbe_hw.h */
271 struct ixgbe_hw hw;
272 u16 msg_enable;
273 struct ixgbe_hw_stats stats;
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274
275 /* Interrupt Throttle Rate */
276 u32 rx_eitr;
277 u32 tx_eitr;
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278
279 unsigned long state;
280 u64 tx_busy;
281};
282
283enum ixbge_state_t {
284 __IXGBE_TESTING,
285 __IXGBE_RESETTING,
286 __IXGBE_DOWN
287};
288
289enum ixgbe_boards {
3957d63d 290 board_82598,
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291};
292
3957d63d 293extern struct ixgbe_info ixgbe_82598_info;
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294
295extern char ixgbe_driver_name[];
9c8eb720 296extern const char ixgbe_driver_version[];
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297
298extern int ixgbe_up(struct ixgbe_adapter *adapter);
299extern void ixgbe_down(struct ixgbe_adapter *adapter);
d4f80882 300extern void ixgbe_reinit_locked(struct ixgbe_adapter *adapter);
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301extern void ixgbe_reset(struct ixgbe_adapter *adapter);
302extern void ixgbe_update_stats(struct ixgbe_adapter *adapter);
303extern void ixgbe_set_ethtool_ops(struct net_device *netdev);
304extern int ixgbe_setup_rx_resources(struct ixgbe_adapter *adapter,
305 struct ixgbe_ring *rxdr);
306extern int ixgbe_setup_tx_resources(struct ixgbe_adapter *adapter,
307 struct ixgbe_ring *txdr);
308
309#endif /* _IXGBE_H_ */