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1/* SPDX-License-Identifier: GPL-2.0-only */
2/* Copyright (C) 2023 Intel Corporation */
3
4#ifndef _IDPF_TXRX_H_
5#define _IDPF_TXRX_H_
6
7#include <net/page_pool/helpers.h>
8#include <net/tcp.h>
9#include <net/netdev_queues.h>
10
11#define IDPF_LARGE_MAX_Q 256
12#define IDPF_MAX_Q 16
13#define IDPF_MIN_Q 2
14/* Mailbox Queue */
15#define IDPF_MAX_MBXQ 1
16
17#define IDPF_MIN_TXQ_DESC 64
18#define IDPF_MIN_RXQ_DESC 64
19#define IDPF_MIN_TXQ_COMPLQ_DESC 256
20#define IDPF_MAX_QIDS 256
21
22/* Number of descriptors in a queue should be a multiple of 32. RX queue
23 * descriptors alone should be a multiple of IDPF_REQ_RXQ_DESC_MULTIPLE
24 * to achieve BufQ descriptors aligned to 32
25 */
26#define IDPF_REQ_DESC_MULTIPLE 32
27#define IDPF_REQ_RXQ_DESC_MULTIPLE (IDPF_MAX_BUFQS_PER_RXQ_GRP * 32)
28#define IDPF_MIN_TX_DESC_NEEDED (MAX_SKB_FRAGS + 6)
29#define IDPF_TX_WAKE_THRESH ((u16)IDPF_MIN_TX_DESC_NEEDED * 2)
30
31#define IDPF_MAX_DESCS 8160
32#define IDPF_MAX_TXQ_DESC ALIGN_DOWN(IDPF_MAX_DESCS, IDPF_REQ_DESC_MULTIPLE)
33#define IDPF_MAX_RXQ_DESC ALIGN_DOWN(IDPF_MAX_DESCS, IDPF_REQ_RXQ_DESC_MULTIPLE)
34#define MIN_SUPPORT_TXDID (\
35 VIRTCHNL2_TXDID_FLEX_FLOW_SCHED |\
36 VIRTCHNL2_TXDID_FLEX_TSO_CTX)
37
38#define IDPF_DFLT_SINGLEQ_TX_Q_GROUPS 1
39#define IDPF_DFLT_SINGLEQ_RX_Q_GROUPS 1
40#define IDPF_DFLT_SINGLEQ_TXQ_PER_GROUP 4
41#define IDPF_DFLT_SINGLEQ_RXQ_PER_GROUP 4
42
43#define IDPF_COMPLQ_PER_GROUP 1
44#define IDPF_SINGLE_BUFQ_PER_RXQ_GRP 1
45#define IDPF_MAX_BUFQS_PER_RXQ_GRP 2
46#define IDPF_BUFQ2_ENA 1
47#define IDPF_NUMQ_PER_CHUNK 1
48
49#define IDPF_DFLT_SPLITQ_TXQ_PER_GROUP 1
50#define IDPF_DFLT_SPLITQ_RXQ_PER_GROUP 1
51
52/* Default vector sharing */
53#define IDPF_MBX_Q_VEC 1
54#define IDPF_MIN_Q_VEC 1
55
56#define IDPF_DFLT_TX_Q_DESC_COUNT 512
57#define IDPF_DFLT_TX_COMPLQ_DESC_COUNT 512
58#define IDPF_DFLT_RX_Q_DESC_COUNT 512
59
60/* IMPORTANT: We absolutely _cannot_ have more buffers in the system than a
61 * given RX completion queue has descriptors. This includes _ALL_ buffer
62 * queues. E.g.: If you have two buffer queues of 512 descriptors and buffers,
63 * you have a total of 1024 buffers so your RX queue _must_ have at least that
64 * many descriptors. This macro divides a given number of RX descriptors by
65 * number of buffer queues to calculate how many descriptors each buffer queue
66 * can have without overrunning the RX queue.
67 *
68 * If you give hardware more buffers than completion descriptors what will
69 * happen is that if hardware gets a chance to post more than ring wrap of
70 * descriptors before SW gets an interrupt and overwrites SW head, the gen bit
71 * in the descriptor will be wrong. Any overwritten descriptors' buffers will
72 * be gone forever and SW has no reasonable way to tell that this has happened.
73 * From SW perspective, when we finally get an interrupt, it looks like we're
74 * still waiting for descriptor to be done, stalling forever.
75 */
76#define IDPF_RX_BUFQ_DESC_COUNT(RXD, NUM_BUFQ) ((RXD) / (NUM_BUFQ))
77
78#define IDPF_RX_BUFQ_WORKING_SET(rxq) ((rxq)->desc_count - 1)
79
80#define IDPF_RX_BUMP_NTC(rxq, ntc) \
81do { \
82 if (unlikely(++(ntc) == (rxq)->desc_count)) { \
83 ntc = 0; \
84 change_bit(__IDPF_Q_GEN_CHK, (rxq)->flags); \
85 } \
86} while (0)
87
88#define IDPF_SINGLEQ_BUMP_RING_IDX(q, idx) \
89do { \
90 if (unlikely(++(idx) == (q)->desc_count)) \
91 idx = 0; \
92} while (0)
93
94#define IDPF_RX_HDR_SIZE 256
95#define IDPF_RX_BUF_2048 2048
96#define IDPF_RX_BUF_4096 4096
97#define IDPF_RX_BUF_STRIDE 32
98#define IDPF_RX_BUF_POST_STRIDE 16
99#define IDPF_LOW_WATERMARK 64
100/* Size of header buffer specifically for header split */
101#define IDPF_HDR_BUF_SIZE 256
102#define IDPF_PACKET_HDR_PAD \
103 (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN * 2)
104#define IDPF_TX_TSO_MIN_MSS 88
105
106/* Minimum number of descriptors between 2 descriptors with the RE bit set;
107 * only relevant in flow scheduling mode
108 */
109#define IDPF_TX_SPLITQ_RE_MIN_GAP 64
110
111#define IDPF_RX_BI_BUFID_S 0
112#define IDPF_RX_BI_BUFID_M GENMASK(14, 0)
113#define IDPF_RX_BI_GEN_S 15
114#define IDPF_RX_BI_GEN_M BIT(IDPF_RX_BI_GEN_S)
115#define IDPF_RXD_EOF_SPLITQ VIRTCHNL2_RX_FLEX_DESC_ADV_STATUS0_EOF_M
116#define IDPF_RXD_EOF_SINGLEQ VIRTCHNL2_RX_BASE_DESC_STATUS_EOF_M
117
118#define IDPF_SINGLEQ_RX_BUF_DESC(rxq, i) \
119 (&(((struct virtchnl2_singleq_rx_buf_desc *)((rxq)->desc_ring))[i]))
120#define IDPF_SPLITQ_RX_BUF_DESC(rxq, i) \
121 (&(((struct virtchnl2_splitq_rx_buf_desc *)((rxq)->desc_ring))[i]))
122#define IDPF_SPLITQ_RX_BI_DESC(rxq, i) ((((rxq)->ring))[i])
123
124#define IDPF_BASE_TX_DESC(txq, i) \
125 (&(((struct idpf_base_tx_desc *)((txq)->desc_ring))[i]))
126#define IDPF_BASE_TX_CTX_DESC(txq, i) \
127 (&(((struct idpf_base_tx_ctx_desc *)((txq)->desc_ring))[i]))
128#define IDPF_SPLITQ_TX_COMPLQ_DESC(txcq, i) \
129 (&(((struct idpf_splitq_tx_compl_desc *)((txcq)->desc_ring))[i]))
130
131#define IDPF_FLEX_TX_DESC(txq, i) \
132 (&(((union idpf_tx_flex_desc *)((txq)->desc_ring))[i]))
133#define IDPF_FLEX_TX_CTX_DESC(txq, i) \
134 (&(((struct idpf_flex_tx_ctx_desc *)((txq)->desc_ring))[i]))
135
136#define IDPF_DESC_UNUSED(txq) \
137 ((((txq)->next_to_clean > (txq)->next_to_use) ? 0 : (txq)->desc_count) + \
138 (txq)->next_to_clean - (txq)->next_to_use - 1)
139
140#define IDPF_TX_BUF_RSV_UNUSED(txq) ((txq)->buf_stack.top)
141#define IDPF_TX_BUF_RSV_LOW(txq) (IDPF_TX_BUF_RSV_UNUSED(txq) < \
142 (txq)->desc_count >> 2)
143
144#define IDPF_TX_COMPLQ_OVERFLOW_THRESH(txcq) ((txcq)->desc_count >> 1)
145/* Determine the absolute number of completions pending, i.e. the number of
146 * completions that are expected to arrive on the TX completion queue.
147 */
148#define IDPF_TX_COMPLQ_PENDING(txq) \
149 (((txq)->num_completions_pending >= (txq)->complq->num_completions ? \
150 0 : U64_MAX) + \
151 (txq)->num_completions_pending - (txq)->complq->num_completions)
152
153#define IDPF_TX_SPLITQ_COMPL_TAG_WIDTH 16
154#define IDPF_SPLITQ_TX_INVAL_COMPL_TAG -1
155/* Adjust the generation for the completion tag and wrap if necessary */
156#define IDPF_TX_ADJ_COMPL_TAG_GEN(txq) \
157 ((++(txq)->compl_tag_cur_gen) >= (txq)->compl_tag_gen_max ? \
158 0 : (txq)->compl_tag_cur_gen)
159
160#define IDPF_TXD_LAST_DESC_CMD (IDPF_TX_DESC_CMD_EOP | IDPF_TX_DESC_CMD_RS)
161
162#define IDPF_TX_FLAGS_TSO BIT(0)
163#define IDPF_TX_FLAGS_IPV4 BIT(1)
164#define IDPF_TX_FLAGS_IPV6 BIT(2)
165#define IDPF_TX_FLAGS_TUNNEL BIT(3)
166
167union idpf_tx_flex_desc {
168 struct idpf_flex_tx_desc q; /* queue based scheduling */
169 struct idpf_flex_tx_sched_desc flow; /* flow based scheduling */
170};
171
172/**
173 * struct idpf_tx_buf
174 * @next_to_watch: Next descriptor to clean
175 * @skb: Pointer to the skb
176 * @dma: DMA address
177 * @len: DMA length
178 * @bytecount: Number of bytes
179 * @gso_segs: Number of GSO segments
180 * @compl_tag: Splitq only, unique identifier for a buffer. Used to compare
181 * with completion tag returned in buffer completion event.
182 * Because the completion tag is expected to be the same in all
183 * data descriptors for a given packet, and a single packet can
184 * span multiple buffers, we need this field to track all
185 * buffers associated with this completion tag independently of
186 * the buf_id. The tag consists of a N bit buf_id and M upper
187 * order "generation bits". See compl_tag_bufid_m and
188 * compl_tag_gen_s in struct idpf_queue. We'll use a value of -1
189 * to indicate the tag is not valid.
190 * @ctx_entry: Singleq only. Used to indicate the corresponding entry
191 * in the descriptor ring was used for a context descriptor and
192 * this buffer entry should be skipped.
193 */
194struct idpf_tx_buf {
195 void *next_to_watch;
196 struct sk_buff *skb;
197 DEFINE_DMA_UNMAP_ADDR(dma);
198 DEFINE_DMA_UNMAP_LEN(len);
199 unsigned int bytecount;
200 unsigned short gso_segs;
201
202 union {
203 int compl_tag;
204
205 bool ctx_entry;
206 };
207};
208
209struct idpf_tx_stash {
210 struct hlist_node hlist;
211 struct idpf_tx_buf buf;
212};
213
214/**
215 * struct idpf_buf_lifo - LIFO for managing OOO completions
216 * @top: Used to know how many buffers are left
217 * @size: Total size of LIFO
218 * @bufs: Backing array
219 */
220struct idpf_buf_lifo {
221 u16 top;
222 u16 size;
223 struct idpf_tx_stash **bufs;
224};
225
226/**
227 * struct idpf_tx_offload_params - Offload parameters for a given packet
228 * @tx_flags: Feature flags enabled for this packet
229 * @hdr_offsets: Offset parameter for single queue model
230 * @cd_tunneling: Type of tunneling enabled for single queue model
231 * @tso_len: Total length of payload to segment
232 * @mss: Segment size
233 * @tso_segs: Number of segments to be sent
234 * @tso_hdr_len: Length of headers to be duplicated
235 * @td_cmd: Command field to be inserted into descriptor
236 */
237struct idpf_tx_offload_params {
238 u32 tx_flags;
239
240 u32 hdr_offsets;
241 u32 cd_tunneling;
242
243 u32 tso_len;
244 u16 mss;
245 u16 tso_segs;
246 u16 tso_hdr_len;
247
248 u16 td_cmd;
249};
250
251/**
252 * struct idpf_tx_splitq_params
253 * @dtype: General descriptor info
254 * @eop_cmd: Type of EOP
255 * @compl_tag: Associated tag for completion
256 * @td_tag: Descriptor tunneling tag
257 * @offload: Offload parameters
258 */
259struct idpf_tx_splitq_params {
260 enum idpf_tx_desc_dtype_value dtype;
261 u16 eop_cmd;
262 union {
263 u16 compl_tag;
264 u16 td_tag;
265 };
266
267 struct idpf_tx_offload_params offload;
268};
269
270enum idpf_tx_ctx_desc_eipt_offload {
271 IDPF_TX_CTX_EXT_IP_NONE = 0x0,
272 IDPF_TX_CTX_EXT_IP_IPV6 = 0x1,
273 IDPF_TX_CTX_EXT_IP_IPV4_NO_CSUM = 0x2,
274 IDPF_TX_CTX_EXT_IP_IPV4 = 0x3
275};
276
277/* Checksum offload bits decoded from the receive descriptor. */
278struct idpf_rx_csum_decoded {
279 u32 l3l4p : 1;
280 u32 ipe : 1;
281 u32 eipe : 1;
282 u32 eudpe : 1;
283 u32 ipv6exadd : 1;
284 u32 l4e : 1;
285 u32 pprs : 1;
286 u32 nat : 1;
287 u32 raw_csum_inv : 1;
288 u32 raw_csum : 16;
289};
290
291struct idpf_rx_extracted {
292 unsigned int size;
293 u16 rx_ptype;
294};
295
296#define IDPF_TX_COMPLQ_CLEAN_BUDGET 256
297#define IDPF_TX_MIN_PKT_LEN 17
298#define IDPF_TX_DESCS_FOR_SKB_DATA_PTR 1
299#define IDPF_TX_DESCS_PER_CACHE_LINE (L1_CACHE_BYTES / \
300 sizeof(struct idpf_flex_tx_desc))
301#define IDPF_TX_DESCS_FOR_CTX 1
302/* TX descriptors needed, worst case */
303#define IDPF_TX_DESC_NEEDED (MAX_SKB_FRAGS + IDPF_TX_DESCS_FOR_CTX + \
304 IDPF_TX_DESCS_PER_CACHE_LINE + \
305 IDPF_TX_DESCS_FOR_SKB_DATA_PTR)
306
307/* The size limit for a transmit buffer in a descriptor is (16K - 1).
308 * In order to align with the read requests we will align the value to
309 * the nearest 4K which represents our maximum read request size.
310 */
311#define IDPF_TX_MAX_READ_REQ_SIZE SZ_4K
312#define IDPF_TX_MAX_DESC_DATA (SZ_16K - 1)
313#define IDPF_TX_MAX_DESC_DATA_ALIGNED \
314 ALIGN_DOWN(IDPF_TX_MAX_DESC_DATA, IDPF_TX_MAX_READ_REQ_SIZE)
315
316#define IDPF_RX_DMA_ATTR \
317 (DMA_ATTR_SKIP_CPU_SYNC | DMA_ATTR_WEAK_ORDERING)
318#define IDPF_RX_DESC(rxq, i) \
319 (&(((union virtchnl2_rx_desc *)((rxq)->desc_ring))[i]))
320
321struct idpf_rx_buf {
322 struct page *page;
323 unsigned int page_offset;
324 u16 truesize;
325};
326
327#define IDPF_RX_MAX_PTYPE_PROTO_IDS 32
328#define IDPF_RX_MAX_PTYPE_SZ (sizeof(struct virtchnl2_ptype) + \
329 (sizeof(u16) * IDPF_RX_MAX_PTYPE_PROTO_IDS))
330#define IDPF_RX_PTYPE_HDR_SZ sizeof(struct virtchnl2_get_ptype_info)
331#define IDPF_RX_MAX_PTYPES_PER_BUF \
332 DIV_ROUND_DOWN_ULL((IDPF_CTLQ_MAX_BUF_LEN - IDPF_RX_PTYPE_HDR_SZ), \
333 IDPF_RX_MAX_PTYPE_SZ)
334
335#define IDPF_GET_PTYPE_SIZE(p) struct_size((p), proto_id, (p)->proto_id_count)
336
337#define IDPF_TUN_IP_GRE (\
338 IDPF_PTYPE_TUNNEL_IP |\
339 IDPF_PTYPE_TUNNEL_IP_GRENAT)
340
341#define IDPF_TUN_IP_GRE_MAC (\
342 IDPF_TUN_IP_GRE |\
343 IDPF_PTYPE_TUNNEL_IP_GRENAT_MAC)
344
345#define IDPF_RX_MAX_PTYPE 1024
346#define IDPF_RX_MAX_BASE_PTYPE 256
347#define IDPF_INVALID_PTYPE_ID 0xFFFF
348
349/* Packet type non-ip values */
350enum idpf_rx_ptype_l2 {
351 IDPF_RX_PTYPE_L2_RESERVED = 0,
352 IDPF_RX_PTYPE_L2_MAC_PAY2 = 1,
353 IDPF_RX_PTYPE_L2_TIMESYNC_PAY2 = 2,
354 IDPF_RX_PTYPE_L2_FIP_PAY2 = 3,
355 IDPF_RX_PTYPE_L2_OUI_PAY2 = 4,
356 IDPF_RX_PTYPE_L2_MACCNTRL_PAY2 = 5,
357 IDPF_RX_PTYPE_L2_LLDP_PAY2 = 6,
358 IDPF_RX_PTYPE_L2_ECP_PAY2 = 7,
359 IDPF_RX_PTYPE_L2_EVB_PAY2 = 8,
360 IDPF_RX_PTYPE_L2_QCN_PAY2 = 9,
361 IDPF_RX_PTYPE_L2_EAPOL_PAY2 = 10,
362 IDPF_RX_PTYPE_L2_ARP = 11,
363};
364
365enum idpf_rx_ptype_outer_ip {
366 IDPF_RX_PTYPE_OUTER_L2 = 0,
367 IDPF_RX_PTYPE_OUTER_IP = 1,
368};
369
370#define IDPF_RX_PTYPE_TO_IPV(ptype, ipv) \
371 (((ptype)->outer_ip == IDPF_RX_PTYPE_OUTER_IP) && \
372 ((ptype)->outer_ip_ver == (ipv)))
373
374enum idpf_rx_ptype_outer_ip_ver {
375 IDPF_RX_PTYPE_OUTER_NONE = 0,
376 IDPF_RX_PTYPE_OUTER_IPV4 = 1,
377 IDPF_RX_PTYPE_OUTER_IPV6 = 2,
378};
379
380enum idpf_rx_ptype_outer_fragmented {
381 IDPF_RX_PTYPE_NOT_FRAG = 0,
382 IDPF_RX_PTYPE_FRAG = 1,
383};
384
385enum idpf_rx_ptype_tunnel_type {
386 IDPF_RX_PTYPE_TUNNEL_NONE = 0,
387 IDPF_RX_PTYPE_TUNNEL_IP_IP = 1,
388 IDPF_RX_PTYPE_TUNNEL_IP_GRENAT = 2,
389 IDPF_RX_PTYPE_TUNNEL_IP_GRENAT_MAC = 3,
390 IDPF_RX_PTYPE_TUNNEL_IP_GRENAT_MAC_VLAN = 4,
391};
392
393enum idpf_rx_ptype_tunnel_end_prot {
394 IDPF_RX_PTYPE_TUNNEL_END_NONE = 0,
395 IDPF_RX_PTYPE_TUNNEL_END_IPV4 = 1,
396 IDPF_RX_PTYPE_TUNNEL_END_IPV6 = 2,
397};
398
399enum idpf_rx_ptype_inner_prot {
400 IDPF_RX_PTYPE_INNER_PROT_NONE = 0,
401 IDPF_RX_PTYPE_INNER_PROT_UDP = 1,
402 IDPF_RX_PTYPE_INNER_PROT_TCP = 2,
403 IDPF_RX_PTYPE_INNER_PROT_SCTP = 3,
404 IDPF_RX_PTYPE_INNER_PROT_ICMP = 4,
405 IDPF_RX_PTYPE_INNER_PROT_TIMESYNC = 5,
406};
407
408enum idpf_rx_ptype_payload_layer {
409 IDPF_RX_PTYPE_PAYLOAD_LAYER_NONE = 0,
410 IDPF_RX_PTYPE_PAYLOAD_LAYER_PAY2 = 1,
411 IDPF_RX_PTYPE_PAYLOAD_LAYER_PAY3 = 2,
412 IDPF_RX_PTYPE_PAYLOAD_LAYER_PAY4 = 3,
413};
414
415enum idpf_tunnel_state {
416 IDPF_PTYPE_TUNNEL_IP = BIT(0),
417 IDPF_PTYPE_TUNNEL_IP_GRENAT = BIT(1),
418 IDPF_PTYPE_TUNNEL_IP_GRENAT_MAC = BIT(2),
419};
420
421struct idpf_ptype_state {
422 bool outer_ip;
423 bool outer_frag;
424 u8 tunnel_state;
425};
426
427struct idpf_rx_ptype_decoded {
428 u32 ptype:10;
429 u32 known:1;
430 u32 outer_ip:1;
431 u32 outer_ip_ver:2;
432 u32 outer_frag:1;
433 u32 tunnel_type:3;
434 u32 tunnel_end_prot:2;
435 u32 tunnel_end_frag:1;
436 u32 inner_prot:4;
437 u32 payload_layer:3;
438};
439
440/**
441 * enum idpf_queue_flags_t
442 * @__IDPF_Q_GEN_CHK: Queues operating in splitq mode use a generation bit to
443 * identify new descriptor writebacks on the ring. HW sets
444 * the gen bit to 1 on the first writeback of any given
445 * descriptor. After the ring wraps, HW sets the gen bit of
446 * those descriptors to 0, and continues flipping
447 * 0->1 or 1->0 on each ring wrap. SW maintains its own
448 * gen bit to know what value will indicate writebacks on
449 * the next pass around the ring. E.g. it is initialized
450 * to 1 and knows that reading a gen bit of 1 in any
451 * descriptor on the initial pass of the ring indicates a
452 * writeback. It also flips on every ring wrap.
453 * @__IDPF_RFLQ_GEN_CHK: Refill queues are SW only, so Q_GEN acts as the HW bit
454 * and RFLGQ_GEN is the SW bit.
455 * @__IDPF_Q_FLOW_SCH_EN: Enable flow scheduling
456 * @__IDPF_Q_SW_MARKER: Used to indicate TX queue marker completions
457 * @__IDPF_Q_POLL_MODE: Enable poll mode
458 * @__IDPF_Q_FLAGS_NBITS: Must be last
459 */
460enum idpf_queue_flags_t {
461 __IDPF_Q_GEN_CHK,
462 __IDPF_RFLQ_GEN_CHK,
463 __IDPF_Q_FLOW_SCH_EN,
464 __IDPF_Q_SW_MARKER,
465 __IDPF_Q_POLL_MODE,
466
467 __IDPF_Q_FLAGS_NBITS,
468};
469
470/**
471 * struct idpf_vec_regs
472 * @dyn_ctl_reg: Dynamic control interrupt register offset
473 * @itrn_reg: Interrupt Throttling Rate register offset
474 * @itrn_index_spacing: Register spacing between ITR registers of the same
475 * vector
476 */
477struct idpf_vec_regs {
478 u32 dyn_ctl_reg;
479 u32 itrn_reg;
480 u32 itrn_index_spacing;
481};
482
483/**
484 * struct idpf_intr_reg
485 * @dyn_ctl: Dynamic control interrupt register
486 * @dyn_ctl_intena_m: Mask for dyn_ctl interrupt enable
487 * @dyn_ctl_itridx_s: Register bit offset for ITR index
488 * @dyn_ctl_itridx_m: Mask for ITR index
489 * @dyn_ctl_intrvl_s: Register bit offset for ITR interval
490 * @rx_itr: RX ITR register
491 * @tx_itr: TX ITR register
492 * @icr_ena: Interrupt cause register offset
493 * @icr_ena_ctlq_m: Mask for ICR
494 */
495struct idpf_intr_reg {
496 void __iomem *dyn_ctl;
497 u32 dyn_ctl_intena_m;
498 u32 dyn_ctl_itridx_s;
499 u32 dyn_ctl_itridx_m;
500 u32 dyn_ctl_intrvl_s;
501 void __iomem *rx_itr;
502 void __iomem *tx_itr;
503 void __iomem *icr_ena;
504 u32 icr_ena_ctlq_m;
505};
506
507/**
508 * struct idpf_q_vector
509 * @vport: Vport back pointer
510 * @affinity_mask: CPU affinity mask
511 * @napi: napi handler
512 * @v_idx: Vector index
513 * @intr_reg: See struct idpf_intr_reg
514 * @num_txq: Number of TX queues
515 * @tx: Array of TX queues to service
516 * @tx_dim: Data for TX net_dim algorithm
517 * @tx_itr_value: TX interrupt throttling rate
518 * @tx_intr_mode: Dynamic ITR or not
519 * @tx_itr_idx: TX ITR index
520 * @num_rxq: Number of RX queues
521 * @rx: Array of RX queues to service
522 * @rx_dim: Data for RX net_dim algorithm
523 * @rx_itr_value: RX interrupt throttling rate
524 * @rx_intr_mode: Dynamic ITR or not
525 * @rx_itr_idx: RX ITR index
526 * @num_bufq: Number of buffer queues
527 * @bufq: Array of buffer queues to service
528 * @total_events: Number of interrupts processed
529 * @name: Queue vector name
530 */
531struct idpf_q_vector {
532 struct idpf_vport *vport;
533 cpumask_t affinity_mask;
534 struct napi_struct napi;
535 u16 v_idx;
536 struct idpf_intr_reg intr_reg;
537
538 u16 num_txq;
539 struct idpf_queue **tx;
540 struct dim tx_dim;
541 u16 tx_itr_value;
542 bool tx_intr_mode;
543 u32 tx_itr_idx;
544
545 u16 num_rxq;
546 struct idpf_queue **rx;
547 struct dim rx_dim;
548 u16 rx_itr_value;
549 bool rx_intr_mode;
550 u32 rx_itr_idx;
551
552 u16 num_bufq;
553 struct idpf_queue **bufq;
554
555 u16 total_events;
556 char *name;
557};
558
559struct idpf_rx_queue_stats {
560 u64_stats_t packets;
561 u64_stats_t bytes;
562 u64_stats_t rsc_pkts;
563 u64_stats_t hw_csum_err;
564 u64_stats_t hsplit_pkts;
565 u64_stats_t hsplit_buf_ovf;
566 u64_stats_t bad_descs;
567};
568
569struct idpf_tx_queue_stats {
570 u64_stats_t packets;
571 u64_stats_t bytes;
572 u64_stats_t lso_pkts;
573 u64_stats_t linearize;
574 u64_stats_t q_busy;
575 u64_stats_t skb_drops;
576 u64_stats_t dma_map_errs;
577};
578
579struct idpf_cleaned_stats {
580 u32 packets;
581 u32 bytes;
582};
583
584union idpf_queue_stats {
585 struct idpf_rx_queue_stats rx;
586 struct idpf_tx_queue_stats tx;
587};
588
589#define IDPF_ITR_DYNAMIC 1
590#define IDPF_ITR_MAX 0x1FE0
591#define IDPF_ITR_20K 0x0032
592#define IDPF_ITR_GRAN_S 1 /* Assume ITR granularity is 2us */
593#define IDPF_ITR_MASK 0x1FFE /* ITR register value alignment mask */
594#define ITR_REG_ALIGN(setting) ((setting) & IDPF_ITR_MASK)
595#define IDPF_ITR_IS_DYNAMIC(itr_mode) (itr_mode)
596#define IDPF_ITR_TX_DEF IDPF_ITR_20K
597#define IDPF_ITR_RX_DEF IDPF_ITR_20K
598/* Index used for 'No ITR' update in DYN_CTL register */
599#define IDPF_NO_ITR_UPDATE_IDX 3
600#define IDPF_ITR_IDX_SPACING(spacing, dflt) (spacing ? spacing : dflt)
601#define IDPF_DIM_DEFAULT_PROFILE_IX 1
602
603/**
604 * struct idpf_queue
605 * @dev: Device back pointer for DMA mapping
606 * @vport: Back pointer to associated vport
607 * @txq_grp: See struct idpf_txq_group
608 * @rxq_grp: See struct idpf_rxq_group
609 * @idx: For buffer queue, it is used as group id, either 0 or 1. On clean,
610 * buffer queue uses this index to determine which group of refill queues
611 * to clean.
612 * For TX queue, it is used as index to map between TX queue group and
613 * hot path TX pointers stored in vport. Used in both singleq/splitq.
614 * For RX queue, it is used to index to total RX queue across groups and
615 * used for skb reporting.
616 * @tail: Tail offset. Used for both queue models single and split. In splitq
617 * model relevant only for TX queue and RX queue.
618 * @tx_buf: See struct idpf_tx_buf
619 * @rx_buf: Struct with RX buffer related members
620 * @rx_buf.buf: See struct idpf_rx_buf
621 * @rx_buf.hdr_buf_pa: DMA handle
622 * @rx_buf.hdr_buf_va: Virtual address
623 * @pp: Page pool pointer
624 * @skb: Pointer to the skb
625 * @q_type: Queue type (TX, RX, TX completion, RX buffer)
626 * @q_id: Queue id
627 * @desc_count: Number of descriptors
628 * @next_to_use: Next descriptor to use. Relevant in both split & single txq
629 * and bufq.
630 * @next_to_clean: Next descriptor to clean. In split queue model, only
631 * relevant to TX completion queue and RX queue.
632 * @next_to_alloc: RX buffer to allocate at. Used only for RX. In splitq model
633 * only relevant to RX queue.
634 * @flags: See enum idpf_queue_flags_t
635 * @q_stats: See union idpf_queue_stats
636 * @stats_sync: See struct u64_stats_sync
637 * @cleaned_bytes: Splitq only, TXQ only: When a TX completion is received on
638 * the TX completion queue, it can be for any TXQ associated
639 * with that completion queue. This means we can clean up to
640 * N TXQs during a single call to clean the completion queue.
641 * cleaned_bytes|pkts tracks the clean stats per TXQ during
642 * that single call to clean the completion queue. By doing so,
643 * we can update BQL with aggregate cleaned stats for each TXQ
644 * only once at the end of the cleaning routine.
645 * @cleaned_pkts: Number of packets cleaned for the above said case
646 * @rx_hsplit_en: RX headsplit enable
647 * @rx_hbuf_size: Header buffer size
648 * @rx_buf_size: Buffer size
649 * @rx_max_pkt_size: RX max packet size
650 * @rx_buf_stride: RX buffer stride
651 * @rx_buffer_low_watermark: RX buffer low watermark
652 * @rxdids: Supported RX descriptor ids
653 * @q_vector: Backreference to associated vector
654 * @size: Length of descriptor ring in bytes
655 * @dma: Physical address of ring
656 * @desc_ring: Descriptor ring memory
657 * @tx_max_bufs: Max buffers that can be transmitted with scatter-gather
658 * @tx_min_pkt_len: Min supported packet length
659 * @num_completions: Only relevant for TX completion queue. It tracks the
660 * number of completions received to compare against the
661 * number of completions pending, as accumulated by the
662 * TX queues.
663 * @buf_stack: Stack of empty buffers to store buffer info for out of order
664 * buffer completions. See struct idpf_buf_lifo.
665 * @compl_tag_bufid_m: Completion tag buffer id mask
666 * @compl_tag_gen_s: Completion tag generation bit
667 * The format of the completion tag will change based on the TXQ
668 * descriptor ring size so that we can maintain roughly the same level
669 * of "uniqueness" across all descriptor sizes. For example, if the
670 * TXQ descriptor ring size is 64 (the minimum size supported), the
671 * completion tag will be formatted as below:
672 * 15 6 5 0
673 * --------------------------------
674 * | GEN=0-1023 |IDX = 0-63|
675 * --------------------------------
676 *
677 * This gives us 64*1024 = 65536 possible unique values. Similarly, if
678 * the TXQ descriptor ring size is 8160 (the maximum size supported),
679 * the completion tag will be formatted as below:
680 * 15 13 12 0
681 * --------------------------------
682 * |GEN | IDX = 0-8159 |
683 * --------------------------------
684 *
685 * This gives us 8*8160 = 65280 possible unique values.
686 * @compl_tag_cur_gen: Used to keep track of current completion tag generation
687 * @compl_tag_gen_max: To determine when compl_tag_cur_gen should be reset
688 * @sched_buf_hash: Hash table to stores buffers
689 */
690struct idpf_queue {
691 struct device *dev;
692 struct idpf_vport *vport;
693 union {
694 struct idpf_txq_group *txq_grp;
695 struct idpf_rxq_group *rxq_grp;
696 };
697 u16 idx;
698 void __iomem *tail;
699 union {
700 struct idpf_tx_buf *tx_buf;
701 struct {
702 struct idpf_rx_buf *buf;
703 dma_addr_t hdr_buf_pa;
704 void *hdr_buf_va;
705 } rx_buf;
706 };
707 struct page_pool *pp;
708 struct sk_buff *skb;
709 u16 q_type;
710 u32 q_id;
711 u16 desc_count;
712
713 u16 next_to_use;
714 u16 next_to_clean;
715 u16 next_to_alloc;
716 DECLARE_BITMAP(flags, __IDPF_Q_FLAGS_NBITS);
717
718 union idpf_queue_stats q_stats;
719 struct u64_stats_sync stats_sync;
720
721 u32 cleaned_bytes;
722 u16 cleaned_pkts;
723
724 bool rx_hsplit_en;
725 u16 rx_hbuf_size;
726 u16 rx_buf_size;
727 u16 rx_max_pkt_size;
728 u16 rx_buf_stride;
729 u8 rx_buffer_low_watermark;
730 u64 rxdids;
731 struct idpf_q_vector *q_vector;
732 unsigned int size;
733 dma_addr_t dma;
734 void *desc_ring;
735
736 u16 tx_max_bufs;
737 u8 tx_min_pkt_len;
738
739 u32 num_completions;
740
741 struct idpf_buf_lifo buf_stack;
742
743 u16 compl_tag_bufid_m;
744 u16 compl_tag_gen_s;
745
746 u16 compl_tag_cur_gen;
747 u16 compl_tag_gen_max;
748
749 DECLARE_HASHTABLE(sched_buf_hash, 12);
750} ____cacheline_internodealigned_in_smp;
751
752/**
753 * struct idpf_sw_queue
754 * @next_to_clean: Next descriptor to clean
755 * @next_to_alloc: Buffer to allocate at
756 * @flags: See enum idpf_queue_flags_t
757 * @ring: Pointer to the ring
758 * @desc_count: Descriptor count
759 * @dev: Device back pointer for DMA mapping
760 *
761 * Software queues are used in splitq mode to manage buffers between rxq
762 * producer and the bufq consumer. These are required in order to maintain a
763 * lockless buffer management system and are strictly software only constructs.
764 */
765struct idpf_sw_queue {
766 u16 next_to_clean;
767 u16 next_to_alloc;
768 DECLARE_BITMAP(flags, __IDPF_Q_FLAGS_NBITS);
769 u16 *ring;
770 u16 desc_count;
771 struct device *dev;
772} ____cacheline_internodealigned_in_smp;
773
774/**
775 * struct idpf_rxq_set
776 * @rxq: RX queue
777 * @refillq0: Pointer to refill queue 0
778 * @refillq1: Pointer to refill queue 1
779 *
780 * Splitq only. idpf_rxq_set associates an rxq with at an array of refillqs.
781 * Each rxq needs a refillq to return used buffers back to the respective bufq.
782 * Bufqs then clean these refillqs for buffers to give to hardware.
783 */
784struct idpf_rxq_set {
785 struct idpf_queue rxq;
786 struct idpf_sw_queue *refillq0;
787 struct idpf_sw_queue *refillq1;
788};
789
790/**
791 * struct idpf_bufq_set
792 * @bufq: Buffer queue
793 * @num_refillqs: Number of refill queues. This is always equal to num_rxq_sets
794 * in idpf_rxq_group.
795 * @refillqs: Pointer to refill queues array.
796 *
797 * Splitq only. idpf_bufq_set associates a bufq to an array of refillqs.
798 * In this bufq_set, there will be one refillq for each rxq in this rxq_group.
799 * Used buffers received by rxqs will be put on refillqs which bufqs will
800 * clean to return new buffers back to hardware.
801 *
802 * Buffers needed by some number of rxqs associated in this rxq_group are
803 * managed by at most two bufqs (depending on performance configuration).
804 */
805struct idpf_bufq_set {
806 struct idpf_queue bufq;
807 int num_refillqs;
808 struct idpf_sw_queue *refillqs;
809};
810
811/**
812 * struct idpf_rxq_group
813 * @vport: Vport back pointer
814 * @singleq: Struct with single queue related members
815 * @singleq.num_rxq: Number of RX queues associated
816 * @singleq.rxqs: Array of RX queue pointers
817 * @splitq: Struct with split queue related members
818 * @splitq.num_rxq_sets: Number of RX queue sets
819 * @splitq.rxq_sets: Array of RX queue sets
820 * @splitq.bufq_sets: Buffer queue set pointer
821 *
822 * In singleq mode, an rxq_group is simply an array of rxqs. In splitq, a
823 * rxq_group contains all the rxqs, bufqs and refillqs needed to
824 * manage buffers in splitq mode.
825 */
826struct idpf_rxq_group {
827 struct idpf_vport *vport;
828
829 union {
830 struct {
831 u16 num_rxq;
832 struct idpf_queue *rxqs[IDPF_LARGE_MAX_Q];
833 } singleq;
834 struct {
835 u16 num_rxq_sets;
836 struct idpf_rxq_set *rxq_sets[IDPF_LARGE_MAX_Q];
837 struct idpf_bufq_set *bufq_sets;
838 } splitq;
839 };
840};
841
842/**
843 * struct idpf_txq_group
844 * @vport: Vport back pointer
845 * @num_txq: Number of TX queues associated
846 * @txqs: Array of TX queue pointers
847 * @complq: Associated completion queue pointer, split queue only
848 * @num_completions_pending: Total number of completions pending for the
849 * completion queue, acculumated for all TX queues
850 * associated with that completion queue.
851 *
852 * Between singleq and splitq, a txq_group is largely the same except for the
853 * complq. In splitq a single complq is responsible for handling completions
854 * for some number of txqs associated in this txq_group.
855 */
856struct idpf_txq_group {
857 struct idpf_vport *vport;
858
859 u16 num_txq;
860 struct idpf_queue *txqs[IDPF_LARGE_MAX_Q];
861
862 struct idpf_queue *complq;
863
864 u32 num_completions_pending;
865};
866
867/**
868 * idpf_size_to_txd_count - Get number of descriptors needed for large Tx frag
869 * @size: transmit request size in bytes
870 *
871 * In the case where a large frag (>= 16K) needs to be split across multiple
872 * descriptors, we need to assume that we can have no more than 12K of data
873 * per descriptor due to hardware alignment restrictions (4K alignment).
874 */
875static inline u32 idpf_size_to_txd_count(unsigned int size)
876{
877 return DIV_ROUND_UP(size, IDPF_TX_MAX_DESC_DATA_ALIGNED);
878}
879
880/**
881 * idpf_tx_singleq_build_ctob - populate command tag offset and size
882 * @td_cmd: Command to be filled in desc
883 * @td_offset: Offset to be filled in desc
884 * @size: Size of the buffer
885 * @td_tag: td tag to be filled
886 *
887 * Returns the 64 bit value populated with the input parameters
888 */
889static inline __le64 idpf_tx_singleq_build_ctob(u64 td_cmd, u64 td_offset,
890 unsigned int size, u64 td_tag)
891{
892 return cpu_to_le64(IDPF_TX_DESC_DTYPE_DATA |
893 (td_cmd << IDPF_TXD_QW1_CMD_S) |
894 (td_offset << IDPF_TXD_QW1_OFFSET_S) |
895 ((u64)size << IDPF_TXD_QW1_TX_BUF_SZ_S) |
896 (td_tag << IDPF_TXD_QW1_L2TAG1_S));
897}
898
899void idpf_tx_splitq_build_ctb(union idpf_tx_flex_desc *desc,
900 struct idpf_tx_splitq_params *params,
901 u16 td_cmd, u16 size);
902void idpf_tx_splitq_build_flow_desc(union idpf_tx_flex_desc *desc,
903 struct idpf_tx_splitq_params *params,
904 u16 td_cmd, u16 size);
905/**
906 * idpf_tx_splitq_build_desc - determine which type of data descriptor to build
907 * @desc: descriptor to populate
908 * @params: pointer to tx params struct
909 * @td_cmd: command to be filled in desc
910 * @size: size of buffer
911 */
912static inline void idpf_tx_splitq_build_desc(union idpf_tx_flex_desc *desc,
913 struct idpf_tx_splitq_params *params,
914 u16 td_cmd, u16 size)
915{
916 if (params->dtype == IDPF_TX_DESC_DTYPE_FLEX_L2TAG1_L2TAG2)
917 idpf_tx_splitq_build_ctb(desc, params, td_cmd, size);
918 else
919 idpf_tx_splitq_build_flow_desc(desc, params, td_cmd, size);
920}
921
922/**
923 * idpf_alloc_page - Allocate a new RX buffer from the page pool
924 * @pool: page_pool to allocate from
925 * @buf: metadata struct to populate with page info
926 * @buf_size: 2K or 4K
927 *
928 * Returns &dma_addr_t to be passed to HW for Rx, %DMA_MAPPING_ERROR otherwise.
929 */
930static inline dma_addr_t idpf_alloc_page(struct page_pool *pool,
931 struct idpf_rx_buf *buf,
932 unsigned int buf_size)
933{
934 if (buf_size == IDPF_RX_BUF_2048)
935 buf->page = page_pool_dev_alloc_frag(pool, &buf->page_offset,
936 buf_size);
937 else
938 buf->page = page_pool_dev_alloc_pages(pool);
939
940 if (!buf->page)
941 return DMA_MAPPING_ERROR;
942
943 buf->truesize = buf_size;
944
945 return page_pool_get_dma_addr(buf->page) + buf->page_offset +
946 pool->p.offset;
947}
948
949/**
950 * idpf_rx_put_page - Return RX buffer page to pool
951 * @rx_buf: RX buffer metadata struct
952 */
953static inline void idpf_rx_put_page(struct idpf_rx_buf *rx_buf)
954{
955 page_pool_put_page(rx_buf->page->pp, rx_buf->page,
956 rx_buf->truesize, true);
957 rx_buf->page = NULL;
958}
959
960/**
961 * idpf_rx_sync_for_cpu - Synchronize DMA buffer
962 * @rx_buf: RX buffer metadata struct
963 * @len: frame length from descriptor
964 */
965static inline void idpf_rx_sync_for_cpu(struct idpf_rx_buf *rx_buf, u32 len)
966{
967 struct page *page = rx_buf->page;
968 struct page_pool *pp = page->pp;
969
970 dma_sync_single_range_for_cpu(pp->p.dev,
971 page_pool_get_dma_addr(page),
972 rx_buf->page_offset + pp->p.offset, len,
973 page_pool_get_dma_dir(pp));
974}
975
976int idpf_vport_singleq_napi_poll(struct napi_struct *napi, int budget);
977void idpf_vport_init_num_qs(struct idpf_vport *vport,
978 struct virtchnl2_create_vport *vport_msg);
979void idpf_vport_calc_num_q_desc(struct idpf_vport *vport);
980int idpf_vport_calc_total_qs(struct idpf_adapter *adapter, u16 vport_index,
981 struct virtchnl2_create_vport *vport_msg,
982 struct idpf_vport_max_q *max_q);
983void idpf_vport_calc_num_q_groups(struct idpf_vport *vport);
984int idpf_vport_queues_alloc(struct idpf_vport *vport);
985void idpf_vport_queues_rel(struct idpf_vport *vport);
986void idpf_vport_intr_rel(struct idpf_vport *vport);
987int idpf_vport_intr_alloc(struct idpf_vport *vport);
988void idpf_vport_intr_update_itr_ena_irq(struct idpf_q_vector *q_vector);
989void idpf_vport_intr_deinit(struct idpf_vport *vport);
990int idpf_vport_intr_init(struct idpf_vport *vport);
991enum pkt_hash_types idpf_ptype_to_htype(const struct idpf_rx_ptype_decoded *decoded);
992int idpf_config_rss(struct idpf_vport *vport);
993int idpf_init_rss(struct idpf_vport *vport);
994void idpf_deinit_rss(struct idpf_vport *vport);
995int idpf_rx_bufs_init_all(struct idpf_vport *vport);
996void idpf_rx_add_frag(struct idpf_rx_buf *rx_buf, struct sk_buff *skb,
997 unsigned int size);
998struct sk_buff *idpf_rx_construct_skb(struct idpf_queue *rxq,
999 struct idpf_rx_buf *rx_buf,
1000 unsigned int size);
1001bool idpf_init_rx_buf_hw_alloc(struct idpf_queue *rxq, struct idpf_rx_buf *buf);
1002void idpf_rx_buf_hw_update(struct idpf_queue *rxq, u32 val);
1003void idpf_tx_buf_hw_update(struct idpf_queue *tx_q, u32 val,
1004 bool xmit_more);
1005unsigned int idpf_size_to_txd_count(unsigned int size);
1006netdev_tx_t idpf_tx_drop_skb(struct idpf_queue *tx_q, struct sk_buff *skb);
1007void idpf_tx_dma_map_error(struct idpf_queue *txq, struct sk_buff *skb,
1008 struct idpf_tx_buf *first, u16 ring_idx);
1009unsigned int idpf_tx_desc_count_required(struct idpf_queue *txq,
1010 struct sk_buff *skb);
1011bool idpf_chk_linearize(struct sk_buff *skb, unsigned int max_bufs,
1012 unsigned int count);
1013int idpf_tx_maybe_stop_common(struct idpf_queue *tx_q, unsigned int size);
1014void idpf_tx_timeout(struct net_device *netdev, unsigned int txqueue);
1015netdev_tx_t idpf_tx_splitq_start(struct sk_buff *skb,
1016 struct net_device *netdev);
1017netdev_tx_t idpf_tx_singleq_start(struct sk_buff *skb,
1018 struct net_device *netdev);
1019bool idpf_rx_singleq_buf_hw_alloc_all(struct idpf_queue *rxq,
1020 u16 cleaned_count);
1021int idpf_tso(struct sk_buff *skb, struct idpf_tx_offload_params *off);
1022
1023#endif /* !_IDPF_TXRX_H_ */