1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Copyright (c) 2018, Intel Corporation. */
9 #define ICE_DFLT_IRQ_WORK 256
10 #define ICE_RXBUF_3072 3072
11 #define ICE_RXBUF_2048 2048
12 #define ICE_RXBUF_1536 1536
13 #define ICE_MAX_CHAINED_RX_BUFS 5
14 #define ICE_MAX_BUF_TXD 8
15 #define ICE_MIN_TX_LEN 17
17 /* The size limit for a transmit buffer in a descriptor is (16K - 1).
18 * In order to align with the read requests we will align the value to
19 * the nearest 4K which represents our maximum read request size.
21 #define ICE_MAX_READ_REQ_SIZE 4096
22 #define ICE_MAX_DATA_PER_TXD (16 * 1024 - 1)
23 #define ICE_MAX_DATA_PER_TXD_ALIGNED \
24 (~(ICE_MAX_READ_REQ_SIZE - 1) & ICE_MAX_DATA_PER_TXD)
26 #define ICE_RX_BUF_WRITE 16 /* Must be power of 2 */
27 #define ICE_MAX_TXQ_PER_TXQG 128
29 /* Attempt to maximize the headroom available for incoming frames. We use a 2K
30 * buffer for MTUs <= 1500 and need 1536/1534 to store the data for the frame.
31 * This leaves us with 512 bytes of room. From that we need to deduct the
32 * space needed for the shared info and the padding needed to IP align the
35 * Note: For cache line sizes 256 or larger this value is going to end
36 * up negative. In these cases we should fall back to the legacy
39 #if (PAGE_SIZE < 8192)
40 #define ICE_2K_TOO_SMALL_WITH_PADDING \
41 ((unsigned int)(NET_SKB_PAD + ICE_RXBUF_1536) > \
42 SKB_WITH_OVERHEAD(ICE_RXBUF_2048))
45 * ice_compute_pad - compute the padding
46 * @rx_buf_len: buffer length
48 * Figure out the size of half page based on given buffer length and
49 * then subtract the skb_shared_info followed by subtraction of the
50 * actual buffer length; this in turn results in the actual space that
51 * is left for padding usage
53 static inline int ice_compute_pad(int rx_buf_len)
57 half_page_size = ALIGN(rx_buf_len, PAGE_SIZE / 2);
58 return SKB_WITH_OVERHEAD(half_page_size) - rx_buf_len;
62 * ice_skb_pad - determine the padding that we can supply
64 * Figure out the right Rx buffer size and based on that calculate the
67 static inline int ice_skb_pad(void)
71 /* If a 2K buffer cannot handle a standard Ethernet frame then
72 * optimize padding for a 3K buffer instead of a 1.5K buffer.
74 * For a 3K buffer we need to add enough padding to allow for
75 * tailroom due to NET_IP_ALIGN possibly shifting us out of
76 * cache-line alignment.
78 if (ICE_2K_TOO_SMALL_WITH_PADDING)
79 rx_buf_len = ICE_RXBUF_3072 + SKB_DATA_ALIGN(NET_IP_ALIGN);
81 rx_buf_len = ICE_RXBUF_1536;
83 /* if needed make room for NET_IP_ALIGN */
84 rx_buf_len -= NET_IP_ALIGN;
86 return ice_compute_pad(rx_buf_len);
89 #define ICE_SKB_PAD ice_skb_pad()
91 #define ICE_2K_TOO_SMALL_WITH_PADDING false
92 #define ICE_SKB_PAD (NET_SKB_PAD + NET_IP_ALIGN)
95 /* We are assuming that the cache line is always 64 Bytes here for ice.
96 * In order to make sure that is a correct assumption there is a check in probe
97 * to print a warning if the read from GLPCI_CNF2 tells us that the cache line
98 * size is 128 bytes. We do it this way because we do not want to read the
99 * GLPCI_CNF2 register or a variable containing the value on every pass through
102 #define ICE_CACHE_LINE_BYTES 64
103 #define ICE_DESCS_PER_CACHE_LINE (ICE_CACHE_LINE_BYTES / \
104 sizeof(struct ice_tx_desc))
105 #define ICE_DESCS_FOR_CTX_DESC 1
106 #define ICE_DESCS_FOR_SKB_DATA_PTR 1
107 /* Tx descriptors needed, worst case */
108 #define DESC_NEEDED (MAX_SKB_FRAGS + ICE_DESCS_FOR_CTX_DESC + \
109 ICE_DESCS_PER_CACHE_LINE + ICE_DESCS_FOR_SKB_DATA_PTR)
110 #define ICE_DESC_UNUSED(R) \
111 (u16)((((R)->next_to_clean > (R)->next_to_use) ? 0 : (R)->count) + \
112 (R)->next_to_clean - (R)->next_to_use - 1)
114 #define ICE_TX_FLAGS_TSO BIT(0)
115 #define ICE_TX_FLAGS_HW_VLAN BIT(1)
116 #define ICE_TX_FLAGS_SW_VLAN BIT(2)
117 /* ICE_TX_FLAGS_DUMMY_PKT is used to mark dummy packets that should be
118 * freed instead of returned like skb packets.
120 #define ICE_TX_FLAGS_DUMMY_PKT BIT(3)
121 #define ICE_TX_FLAGS_TSYN BIT(4)
122 #define ICE_TX_FLAGS_IPV4 BIT(5)
123 #define ICE_TX_FLAGS_IPV6 BIT(6)
124 #define ICE_TX_FLAGS_TUNNEL BIT(7)
125 #define ICE_TX_FLAGS_VLAN_M 0xffff0000
126 #define ICE_TX_FLAGS_VLAN_PR_M 0xe0000000
127 #define ICE_TX_FLAGS_VLAN_PR_S 29
128 #define ICE_TX_FLAGS_VLAN_S 16
130 #define ICE_XDP_PASS 0
131 #define ICE_XDP_CONSUMED BIT(0)
132 #define ICE_XDP_TX BIT(1)
133 #define ICE_XDP_REDIR BIT(2)
135 #define ICE_RX_DMA_ATTR \
136 (DMA_ATTR_SKIP_CPU_SYNC | DMA_ATTR_WEAK_ORDERING)
138 #define ICE_ETH_PKT_HDR_PAD (ETH_HLEN + ETH_FCS_LEN + (VLAN_HLEN * 2))
140 #define ICE_TXD_LAST_DESC_CMD (ICE_TX_DESC_CMD_EOP | ICE_TX_DESC_CMD_RS)
143 struct ice_tx_desc *next_to_watch;
146 void *raw_buf; /* used for XDP */
148 unsigned int bytecount;
149 unsigned short gso_segs;
151 DEFINE_DMA_UNMAP_LEN(len);
152 DEFINE_DMA_UNMAP_ADDR(dma);
155 struct ice_tx_offload_params {
157 struct ice_ring *tx_ring;
161 u32 cd_tunnel_params;
171 unsigned int page_offset;
175 struct xdp_buff *xdp;
185 struct ice_txq_stats {
189 int prev_pkt; /* negative if no pending Tx descriptors */
192 struct ice_rxq_stats {
194 u64 alloc_page_failed;
195 u64 alloc_buf_failed;
198 enum ice_ring_state_t {
199 ICE_TX_XPS_INIT_DONE,
203 /* this enum matches hardware bits and is meant to be used by DYN_CTLN
204 * registers and QINT registers or more generally anywhere in the manual
205 * mentioning ITR_INDX, ITR_NONE cannot be used as an index 'n' into any
206 * register but instead is a special value meaning "don't update" ITR0/1/2.
212 ICE_ITR_NONE = 3 /* ITR_NONE must not be used as an index */
215 /* Header split modes defined by DTYPE field of Rx RLAN context */
217 ICE_RX_DTYPE_NO_SPLIT = 0,
218 ICE_RX_DTYPE_HEADER_SPLIT = 1,
219 ICE_RX_DTYPE_SPLIT_ALWAYS = 2,
222 /* indices into GLINT_ITR registers */
223 #define ICE_RX_ITR ICE_IDX_ITR0
224 #define ICE_TX_ITR ICE_IDX_ITR1
225 #define ICE_ITR_8K 124
226 #define ICE_ITR_20K 50
227 #define ICE_ITR_MAX 8160 /* 0x1FE0 */
228 #define ICE_DFLT_TX_ITR ICE_ITR_20K
229 #define ICE_DFLT_RX_ITR ICE_ITR_20K
230 enum ice_dynamic_itr {
235 #define ITR_IS_DYNAMIC(rc) ((rc)->itr_mode == ITR_DYNAMIC)
236 #define ICE_ITR_GRAN_S 1 /* ITR granularity is always 2us */
237 #define ICE_ITR_GRAN_US BIT(ICE_ITR_GRAN_S)
238 #define ICE_ITR_MASK 0x1FFE /* ITR register value alignment mask */
239 #define ITR_REG_ALIGN(setting) ((setting) & ICE_ITR_MASK)
241 #define ICE_DFLT_INTRL 0
242 #define ICE_MAX_INTRL 236
244 #define ICE_IN_WB_ON_ITR_MODE 255
245 /* Sets WB_ON_ITR and assumes INTENA bit is already cleared, which allows
246 * setting the MSK_M bit to tell hardware to ignore the INTENA_M bit. Also,
247 * set the write-back latency to the usecs passed in.
249 #define ICE_GLINT_DYN_CTL_WB_ON_ITR(usecs, itr_idx) \
250 ((((usecs) << (GLINT_DYN_CTL_INTERVAL_S - ICE_ITR_GRAN_S)) & \
251 GLINT_DYN_CTL_INTERVAL_M) | \
252 (((itr_idx) << GLINT_DYN_CTL_ITR_INDX_S) & \
253 GLINT_DYN_CTL_ITR_INDX_M) | GLINT_DYN_CTL_INTENA_MSK_M | \
254 GLINT_DYN_CTL_WB_ON_ITR_M)
256 /* Legacy or Advanced Mode Queue */
257 #define ICE_TX_ADVANCED 0
258 #define ICE_TX_LEGACY 1
260 /* descriptor ring, associated with a VSI */
262 /* CL1 - 1st cacheline starts here */
263 struct ice_ring *next; /* pointer to next ring in q_vector */
264 void *desc; /* Descriptor ring memory */
265 struct device *dev; /* Used for DMA mapping */
266 struct net_device *netdev; /* netdev ring maps to */
267 struct ice_vsi *vsi; /* Backreference to associated VSI */
268 struct ice_q_vector *q_vector; /* Backreference to associated vector */
271 struct ice_tx_buf *tx_buf;
272 struct ice_rx_buf *rx_buf;
274 /* CL2 - 2nd cacheline starts here */
275 u16 q_index; /* Queue number of ring */
276 u16 q_handle; /* Queue handle per TC */
278 u8 ring_active:1; /* is ring online or not */
280 u16 count; /* Number of descriptors */
281 u16 reg_idx; /* HW register index of the ring */
283 /* used in interrupt processing */
289 struct ice_q_stats stats;
290 struct u64_stats_sync syncp;
292 struct ice_txq_stats tx_stats;
293 struct ice_rxq_stats rx_stats;
296 struct rcu_head rcu; /* to avoid race on free */
297 DECLARE_BITMAP(xps_state, ICE_TX_NBITS); /* XPS Config State */
298 struct bpf_prog *xdp_prog;
299 struct xsk_buff_pool *xsk_pool;
301 /* CL3 - 3rd cacheline starts here */
302 struct xdp_rxq_info xdp_rxq;
304 /* CLX - the below items are only accessed infrequently and should be
305 * in their own cache line if possible
307 #define ICE_TX_FLAGS_RING_XDP BIT(0)
308 #define ICE_RX_FLAGS_RING_BUILD_SKB BIT(1)
310 dma_addr_t dma; /* physical address of ring */
311 unsigned int size; /* length of descriptor ring in bytes */
312 u32 txq_teid; /* Added Tx queue TEID */
314 u8 dcb_tc; /* Traffic class of ring */
315 struct ice_ptp_tx *tx_tstamps;
319 } ____cacheline_internodealigned_in_smp;
321 static inline bool ice_ring_uses_build_skb(struct ice_ring *ring)
323 return !!(ring->flags & ICE_RX_FLAGS_RING_BUILD_SKB);
326 static inline void ice_set_ring_build_skb_ena(struct ice_ring *ring)
328 ring->flags |= ICE_RX_FLAGS_RING_BUILD_SKB;
331 static inline void ice_clear_ring_build_skb_ena(struct ice_ring *ring)
333 ring->flags &= ~ICE_RX_FLAGS_RING_BUILD_SKB;
336 static inline bool ice_ring_is_xdp(struct ice_ring *ring)
338 return !!(ring->flags & ICE_TX_FLAGS_RING_XDP);
341 struct ice_ring_container {
342 /* head of linked-list of rings */
343 struct ice_ring *ring;
344 struct dim dim; /* data for net_dim algorithm */
345 u16 itr_idx; /* index in the interrupt vector */
346 /* this matches the maximum number of ITR bits, but in usec
347 * values, so it is shifted left one bit (bit zero is ignored)
354 struct ice_coalesce_stored {
362 /* iterator for handling rings in ring container */
363 #define ice_for_each_ring(pos, head) \
364 for (pos = (head).ring; pos; pos = pos->next)
366 static inline unsigned int ice_rx_pg_order(struct ice_ring *ring)
368 #if (PAGE_SIZE < 8192)
369 if (ring->rx_buf_len > (PAGE_SIZE / 2))
375 #define ice_rx_pg_size(_ring) (PAGE_SIZE << ice_rx_pg_order(_ring))
377 union ice_32b_rx_flex_desc;
379 bool ice_alloc_rx_bufs(struct ice_ring *rxr, u16 cleaned_count);
380 netdev_tx_t ice_start_xmit(struct sk_buff *skb, struct net_device *netdev);
381 void ice_clean_tx_ring(struct ice_ring *tx_ring);
382 void ice_clean_rx_ring(struct ice_ring *rx_ring);
383 int ice_setup_tx_ring(struct ice_ring *tx_ring);
384 int ice_setup_rx_ring(struct ice_ring *rx_ring);
385 void ice_free_tx_ring(struct ice_ring *tx_ring);
386 void ice_free_rx_ring(struct ice_ring *rx_ring);
387 int ice_napi_poll(struct napi_struct *napi, int budget);
389 ice_prgm_fdir_fltr(struct ice_vsi *vsi, struct ice_fltr_desc *fdir_desc,
391 int ice_clean_rx_irq(struct ice_ring *rx_ring, int budget);
392 void ice_clean_ctrl_tx_irq(struct ice_ring *tx_ring);
393 #endif /* _ICE_TXRX_H_ */