1 /*******************************************************************************
3 * Intel Ethernet Controller XL710 Family Linux Driver
4 * Copyright(c) 2013 Intel Corporation.
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.
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
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.
19 * The full GNU General Public License is included in this distribution in
20 * the file called "COPYING".
22 * Contact Information:
23 * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
24 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
26 ******************************************************************************/
28 /* Interrupt Throttling and Rate Limiting (storm control) Goodies */
30 #define I40E_MAX_ITR 0x07FF
31 #define I40E_MIN_ITR 0x0001
32 #define I40E_ITR_USEC_RESOLUTION 2
33 #define I40E_MAX_IRATE 0x03F
34 #define I40E_MIN_IRATE 0x001
35 #define I40E_IRATE_USEC_RESOLUTION 4
36 #define I40E_ITR_100K 0x0005
37 #define I40E_ITR_20K 0x0019
38 #define I40E_ITR_8K 0x003E
39 #define I40E_ITR_4K 0x007A
40 #define I40E_ITR_RX_DEF I40E_ITR_8K
41 #define I40E_ITR_TX_DEF I40E_ITR_4K
42 #define I40E_ITR_DYNAMIC 0x8000 /* use top bit as a flag */
43 #define I40E_MIN_INT_RATE 250 /* ~= 1000000 / (I40E_MAX_ITR * 2) */
44 #define I40E_MAX_INT_RATE 500000 /* == 1000000 / (I40E_MIN_ITR * 2) */
45 #define I40E_DEFAULT_IRQ_WORK 256
46 #define ITR_TO_REG(setting) ((setting & ~I40E_ITR_DYNAMIC) >> 1)
47 #define ITR_IS_DYNAMIC(setting) (!!(setting & I40E_ITR_DYNAMIC))
48 #define ITR_REG_TO_USEC(itr_reg) (itr_reg << 1)
50 #define I40E_QUEUE_END_OF_LIST 0x7FF
52 #define I40E_ITR_NONE 3
56 /* Supported Rx Buffer Sizes */
57 #define I40E_RXBUFFER_512 512 /* Used for packet split */
58 #define I40E_RXBUFFER_2048 2048
59 #define I40E_RXBUFFER_3072 3072 /* For FCoE MTU of 2158 */
60 #define I40E_RXBUFFER_4096 4096
61 #define I40E_RXBUFFER_8192 8192
62 #define I40E_MAX_RXBUFFER 9728 /* largest size for single descriptor */
64 /* NOTE: netdev_alloc_skb reserves up to 64 bytes, NET_IP_ALIGN means we
65 * reserve 2 more, and skb_shared_info adds an additional 384 bytes more,
66 * this adds up to 512 bytes of extra data meaning the smallest allocation
67 * we could have is 1K.
68 * i.e. RXBUFFER_512 --> size-1024 slab
70 #define I40E_RX_HDR_SIZE I40E_RXBUFFER_512
72 /* How many Rx Buffers do we bundle into one write to the hardware ? */
73 #define I40E_RX_BUFFER_WRITE 16 /* Must be power of 2 */
74 #define I40E_RX_NEXT_DESC(r, i, n) \
77 if ((i) == (r)->count) \
79 (n) = I40E_RX_DESC((r), (i)); \
82 #define I40E_RX_NEXT_DESC_PREFETCH(r, i, n) \
84 I40E_RX_NEXT_DESC((r), (i), (n)); \
88 #define i40e_rx_desc i40e_32byte_rx_desc
90 #define I40E_MIN_TX_LEN 17
91 #define I40E_MAX_DATA_PER_TXD 16383 /* aka 16kB - 1 */
93 /* Tx Descriptors needed, worst case */
94 #define TXD_USE_COUNT(S) DIV_ROUND_UP((S), I40E_MAX_DATA_PER_TXD)
95 #define DESC_NEEDED ((MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE)) + 4)
97 #define I40E_TX_FLAGS_CSUM (u32)(1)
98 #define I40E_TX_FLAGS_HW_VLAN (u32)(1 << 1)
99 #define I40E_TX_FLAGS_SW_VLAN (u32)(1 << 2)
100 #define I40E_TX_FLAGS_TSO (u32)(1 << 3)
101 #define I40E_TX_FLAGS_IPV4 (u32)(1 << 4)
102 #define I40E_TX_FLAGS_IPV6 (u32)(1 << 5)
103 #define I40E_TX_FLAGS_FCCRC (u32)(1 << 6)
104 #define I40E_TX_FLAGS_FSO (u32)(1 << 7)
105 #define I40E_TX_FLAGS_VLAN_MASK 0xffff0000
106 #define I40E_TX_FLAGS_VLAN_PRIO_MASK 0xe0000000
107 #define I40E_TX_FLAGS_VLAN_PRIO_SHIFT 29
108 #define I40E_TX_FLAGS_VLAN_SHIFT 16
110 struct i40e_tx_buffer {
111 struct i40e_tx_desc *next_to_watch;
112 unsigned long time_stamp;
114 unsigned int bytecount;
115 unsigned short gso_segs;
116 DEFINE_DMA_UNMAP_ADDR(dma);
117 DEFINE_DMA_UNMAP_LEN(len);
121 struct i40e_rx_buffer {
126 unsigned int page_offset;
129 struct i40e_queue_stats {
134 struct i40e_tx_queue_stats {
140 struct i40e_rx_queue_stats {
142 u64 alloc_rx_page_failed;
143 u64 alloc_rx_buff_failed;
146 enum i40e_ring_state_t {
147 __I40E_TX_FDIR_INIT_DONE,
148 __I40E_TX_XPS_INIT_DONE,
149 __I40E_TX_DETECT_HANG,
150 __I40E_HANG_CHECK_ARMED,
151 __I40E_RX_PS_ENABLED,
152 __I40E_RX_LRO_ENABLED,
153 __I40E_RX_16BYTE_DESC_ENABLED,
156 #define ring_is_ps_enabled(ring) \
157 test_bit(__I40E_RX_PS_ENABLED, &(ring)->state)
158 #define set_ring_ps_enabled(ring) \
159 set_bit(__I40E_RX_PS_ENABLED, &(ring)->state)
160 #define clear_ring_ps_enabled(ring) \
161 clear_bit(__I40E_RX_PS_ENABLED, &(ring)->state)
162 #define check_for_tx_hang(ring) \
163 test_bit(__I40E_TX_DETECT_HANG, &(ring)->state)
164 #define set_check_for_tx_hang(ring) \
165 set_bit(__I40E_TX_DETECT_HANG, &(ring)->state)
166 #define clear_check_for_tx_hang(ring) \
167 clear_bit(__I40E_TX_DETECT_HANG, &(ring)->state)
168 #define ring_is_lro_enabled(ring) \
169 test_bit(__I40E_RX_LRO_ENABLED, &(ring)->state)
170 #define set_ring_lro_enabled(ring) \
171 set_bit(__I40E_RX_LRO_ENABLED, &(ring)->state)
172 #define clear_ring_lro_enabled(ring) \
173 clear_bit(__I40E_RX_LRO_ENABLED, &(ring)->state)
174 #define ring_is_16byte_desc_enabled(ring) \
175 test_bit(__I40E_RX_16BYTE_DESC_ENABLED, &(ring)->state)
176 #define set_ring_16byte_desc_enabled(ring) \
177 set_bit(__I40E_RX_16BYTE_DESC_ENABLED, &(ring)->state)
178 #define clear_ring_16byte_desc_enabled(ring) \
179 clear_bit(__I40E_RX_16BYTE_DESC_ENABLED, &(ring)->state)
181 /* struct that defines a descriptor ring, associated with a VSI */
183 struct i40e_ring *next; /* pointer to next ring in q_vector */
184 void *desc; /* Descriptor ring memory */
185 struct device *dev; /* Used for DMA mapping */
186 struct net_device *netdev; /* netdev ring maps to */
188 struct i40e_tx_buffer *tx_bi;
189 struct i40e_rx_buffer *rx_bi;
192 u16 queue_index; /* Queue number of ring */
193 u8 dcb_tc; /* Traffic class of ring */
196 u16 count; /* Number of descriptors */
197 u16 reg_idx; /* HW register index of the ring */
201 #define I40E_RX_DTYPE_NO_SPLIT 0
202 #define I40E_RX_DTYPE_SPLIT_ALWAYS 1
203 #define I40E_RX_DTYPE_HEADER_SPLIT 2
205 #define I40E_RX_SPLIT_L2 0x1
206 #define I40E_RX_SPLIT_IP 0x2
207 #define I40E_RX_SPLIT_TCP_UDP 0x4
208 #define I40E_RX_SPLIT_SCTP 0x8
210 /* used in interrupt processing */
217 bool ring_active; /* is ring online or not */
220 struct i40e_queue_stats stats;
221 struct u64_stats_sync syncp;
223 struct i40e_tx_queue_stats tx_stats;
224 struct i40e_rx_queue_stats rx_stats;
227 unsigned int size; /* length of descriptor ring in bytes */
228 dma_addr_t dma; /* physical address of ring */
230 struct i40e_vsi *vsi; /* Backreference to associated VSI */
231 struct i40e_q_vector *q_vector; /* Backreference to associated vector */
233 struct rcu_head rcu; /* to avoid race on free */
234 } ____cacheline_internodealigned_in_smp;
236 enum i40e_latency_range {
237 I40E_LOWEST_LATENCY = 0,
238 I40E_LOW_LATENCY = 1,
239 I40E_BULK_LATENCY = 2,
242 struct i40e_ring_container {
243 /* array of pointers to rings */
244 struct i40e_ring *ring;
245 unsigned int total_bytes; /* total bytes processed this int */
246 unsigned int total_packets; /* total packets processed this int */
248 enum i40e_latency_range latency_range;
252 /* iterator for handling rings in ring container */
253 #define i40e_for_each_ring(pos, head) \
254 for (pos = (head).ring; pos != NULL; pos = pos->next)
256 void i40e_alloc_rx_buffers(struct i40e_ring *rxr, u16 cleaned_count);
257 netdev_tx_t i40e_lan_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
258 void i40e_clean_tx_ring(struct i40e_ring *tx_ring);
259 void i40e_clean_rx_ring(struct i40e_ring *rx_ring);
260 int i40e_setup_tx_descriptors(struct i40e_ring *tx_ring);
261 int i40e_setup_rx_descriptors(struct i40e_ring *rx_ring);
262 void i40e_free_tx_resources(struct i40e_ring *tx_ring);
263 void i40e_free_rx_resources(struct i40e_ring *rx_ring);
264 int i40e_napi_poll(struct napi_struct *napi, int budget);