1 /* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
2 /* Copyright (C) 2015-2018 Netronome Systems, Inc. */
3 
4 /*
5  * nfp_net.h
6  * Declarations for Netronome network device driver.
7  * Authors: Jakub Kicinski <jakub.kicinski@netronome.com>
8  *          Jason McMullan <jason.mcmullan@netronome.com>
9  *          Rolf Neugebauer <rolf.neugebauer@netronome.com>
10  */
11 
12 #ifndef _NFP_NET_H_
13 #define _NFP_NET_H_
14 
15 #include <linux/atomic.h>
16 #include <linux/interrupt.h>
17 #include <linux/list.h>
18 #include <linux/netdevice.h>
19 #include <linux/pci.h>
20 #include <linux/dim.h>
21 #include <linux/io-64-nonatomic-hi-lo.h>
22 #include <linux/semaphore.h>
23 #include <linux/workqueue.h>
24 #include <net/xdp.h>
25 
26 #include "nfp_net_ctrl.h"
27 
28 #define nn_pr(nn, lvl, fmt, args...)					\
29 	({								\
30 		struct nfp_net *__nn = (nn);				\
31 									\
32 		if (__nn->dp.netdev)					\
33 			netdev_printk(lvl, __nn->dp.netdev, fmt, ## args); \
34 		else							\
35 			dev_printk(lvl, __nn->dp.dev, "ctrl: " fmt, ## args); \
36 	})
37 
38 #define nn_err(nn, fmt, args...)	nn_pr(nn, KERN_ERR, fmt, ## args)
39 #define nn_warn(nn, fmt, args...)	nn_pr(nn, KERN_WARNING, fmt, ## args)
40 #define nn_info(nn, fmt, args...)	nn_pr(nn, KERN_INFO, fmt, ## args)
41 #define nn_dbg(nn, fmt, args...)	nn_pr(nn, KERN_DEBUG, fmt, ## args)
42 
43 #define nn_dp_warn(dp, fmt, args...)					\
44 	({								\
45 		struct nfp_net_dp *__dp = (dp);				\
46 									\
47 		if (unlikely(net_ratelimit())) {			\
48 			if (__dp->netdev)				\
49 				netdev_warn(__dp->netdev, fmt, ## args); \
50 			else						\
51 				dev_warn(__dp->dev, fmt, ## args);	\
52 		}							\
53 	})
54 
55 /* Max time to wait for NFP to respond on updates (in seconds) */
56 #define NFP_NET_POLL_TIMEOUT	5
57 
58 /* Interval for reading offloaded filter stats */
59 #define NFP_NET_STAT_POLL_IVL	msecs_to_jiffies(100)
60 
61 /* Bar allocation */
62 #define NFP_NET_CTRL_BAR	0
63 #define NFP_NET_Q0_BAR		2
64 #define NFP_NET_Q1_BAR		4	/* OBSOLETE */
65 
66 /* Default size for MTU and freelist buffer sizes */
67 #define NFP_NET_DEFAULT_MTU		1500U
68 
69 /* Maximum number of bytes prepended to a packet */
70 #define NFP_NET_MAX_PREPEND		64
71 
72 /* Interrupt definitions */
73 #define NFP_NET_NON_Q_VECTORS		2
74 #define NFP_NET_IRQ_LSC_IDX		0
75 #define NFP_NET_IRQ_EXN_IDX		1
76 #define NFP_NET_MIN_VNIC_IRQS		(NFP_NET_NON_Q_VECTORS + 1)
77 
78 /* Queue/Ring definitions */
79 #define NFP_NET_MAX_TX_RINGS	64	/* Max. # of Tx rings per device */
80 #define NFP_NET_MAX_RX_RINGS	64	/* Max. # of Rx rings per device */
81 #define NFP_NET_MAX_R_VECS	(NFP_NET_MAX_TX_RINGS > NFP_NET_MAX_RX_RINGS ? \
82 				 NFP_NET_MAX_TX_RINGS : NFP_NET_MAX_RX_RINGS)
83 #define NFP_NET_MAX_IRQS	(NFP_NET_NON_Q_VECTORS + NFP_NET_MAX_R_VECS)
84 
85 #define NFP_NET_TX_DESCS_DEFAULT 4096	/* Default # of Tx descs per ring */
86 #define NFP_NET_RX_DESCS_DEFAULT 4096	/* Default # of Rx descs per ring */
87 
88 #define NFP_NET_FL_BATCH	16	/* Add freelist in this Batch size */
89 #define NFP_NET_XDP_MAX_COMPLETE 2048	/* XDP bufs to reclaim in NAPI poll */
90 
91 /* MC definitions */
92 #define NFP_NET_CFG_MAC_MC_MAX	1024	/* The maximum number of MC address per port*/
93 
94 /* Offload definitions */
95 #define NFP_NET_N_VXLAN_PORTS	(NFP_NET_CFG_VXLAN_SZ / sizeof(__be16))
96 
97 #define NFP_NET_RX_BUF_HEADROOM	(NET_SKB_PAD + NET_IP_ALIGN)
98 #define NFP_NET_RX_BUF_NON_DATA	(NFP_NET_RX_BUF_HEADROOM +		\
99 				 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
100 
101 /* Forward declarations */
102 struct nfp_cpp;
103 struct nfp_dev_info;
104 struct nfp_dp_ops;
105 struct nfp_eth_table_port;
106 struct nfp_net;
107 struct nfp_net_r_vector;
108 struct nfp_port;
109 struct xsk_buff_pool;
110 
111 struct nfp_nfd3_tx_desc;
112 struct nfp_nfd3_tx_buf;
113 
114 struct nfp_nfdk_tx_desc;
115 struct nfp_nfdk_tx_buf;
116 
117 /* Convenience macro for wrapping descriptor index on ring size */
118 #define D_IDX(ring, idx)	((idx) & ((ring)->cnt - 1))
119 
120 /* Convenience macro for writing dma address into RX/TX descriptors */
121 #define nfp_desc_set_dma_addr_40b(desc, dma_addr)			\
122 	do {								\
123 		__typeof__(desc) __d = (desc);				\
124 		dma_addr_t __addr = (dma_addr);				\
125 									\
126 		__d->dma_addr_lo = cpu_to_le32(lower_32_bits(__addr));	\
127 		__d->dma_addr_hi = upper_32_bits(__addr) & 0xff;	\
128 	} while (0)
129 
130 #define nfp_desc_set_dma_addr_48b(desc, dma_addr)			\
131 	do {								\
132 		__typeof__(desc) __d = (desc);				\
133 		dma_addr_t __addr = (dma_addr);				\
134 									\
135 		__d->dma_addr_hi = cpu_to_le16(upper_32_bits(__addr));	\
136 		__d->dma_addr_lo = cpu_to_le32(lower_32_bits(__addr));	\
137 	} while (0)
138 
139 /**
140  * struct nfp_net_tx_ring - TX ring structure
141  * @r_vec:      Back pointer to ring vector structure
142  * @idx:        Ring index from Linux's perspective
143  * @data_pending: number of bytes added to current block (NFDK only)
144  * @qcp_q:      Pointer to base of the QCP TX queue
145  * @txrwb:	TX pointer write back area
146  * @cnt:        Size of the queue in number of descriptors
147  * @wr_p:       TX ring write pointer (free running)
148  * @rd_p:       TX ring read pointer (free running)
149  * @qcp_rd_p:   Local copy of QCP TX queue read pointer
150  * @wr_ptr_add:	Accumulated number of buffers to add to QCP write pointer
151  *		(used for .xmit_more delayed kick)
152  * @txbufs:	Array of transmitted TX buffers, to free on transmit (NFD3)
153  * @ktxbufs:	Array of transmitted TX buffers, to free on transmit (NFDK)
154  * @txds:	Virtual address of TX ring in host memory (NFD3)
155  * @ktxds:	Virtual address of TX ring in host memory (NFDK)
156  *
157  * @qcidx:      Queue Controller Peripheral (QCP) queue index for the TX queue
158  * @dma:        DMA address of the TX ring
159  * @size:       Size, in bytes, of the TX ring (needed to free)
160  * @is_xdp:	Is this a XDP TX ring?
161  */
162 struct nfp_net_tx_ring {
163 	struct nfp_net_r_vector *r_vec;
164 
165 	u16 idx;
166 	u16 data_pending;
167 	u8 __iomem *qcp_q;
168 	u64 *txrwb;
169 
170 	u32 cnt;
171 	u32 wr_p;
172 	u32 rd_p;
173 	u32 qcp_rd_p;
174 
175 	u32 wr_ptr_add;
176 
177 	union {
178 		struct nfp_nfd3_tx_buf *txbufs;
179 		struct nfp_nfdk_tx_buf *ktxbufs;
180 	};
181 	union {
182 		struct nfp_nfd3_tx_desc *txds;
183 		struct nfp_nfdk_tx_desc *ktxds;
184 	};
185 
186 	/* Cold data follows */
187 	int qcidx;
188 
189 	dma_addr_t dma;
190 	size_t size;
191 	bool is_xdp;
192 } ____cacheline_aligned;
193 
194 /* RX and freelist descriptor format */
195 
196 #define PCIE_DESC_RX_DD			BIT(7)
197 #define PCIE_DESC_RX_META_LEN_MASK	GENMASK(6, 0)
198 
199 /* Flags in the RX descriptor */
200 #define PCIE_DESC_RX_RSS		cpu_to_le16(BIT(15))
201 #define PCIE_DESC_RX_I_IP4_CSUM		cpu_to_le16(BIT(14))
202 #define PCIE_DESC_RX_I_IP4_CSUM_OK	cpu_to_le16(BIT(13))
203 #define PCIE_DESC_RX_I_TCP_CSUM		cpu_to_le16(BIT(12))
204 #define PCIE_DESC_RX_I_TCP_CSUM_OK	cpu_to_le16(BIT(11))
205 #define PCIE_DESC_RX_I_UDP_CSUM		cpu_to_le16(BIT(10))
206 #define PCIE_DESC_RX_I_UDP_CSUM_OK	cpu_to_le16(BIT(9))
207 #define PCIE_DESC_RX_DECRYPTED		cpu_to_le16(BIT(8))
208 #define PCIE_DESC_RX_EOP		cpu_to_le16(BIT(7))
209 #define PCIE_DESC_RX_IP4_CSUM		cpu_to_le16(BIT(6))
210 #define PCIE_DESC_RX_IP4_CSUM_OK	cpu_to_le16(BIT(5))
211 #define PCIE_DESC_RX_TCP_CSUM		cpu_to_le16(BIT(4))
212 #define PCIE_DESC_RX_TCP_CSUM_OK	cpu_to_le16(BIT(3))
213 #define PCIE_DESC_RX_UDP_CSUM		cpu_to_le16(BIT(2))
214 #define PCIE_DESC_RX_UDP_CSUM_OK	cpu_to_le16(BIT(1))
215 #define PCIE_DESC_RX_VLAN		cpu_to_le16(BIT(0))
216 
217 #define PCIE_DESC_RX_CSUM_ALL		(PCIE_DESC_RX_IP4_CSUM |	\
218 					 PCIE_DESC_RX_TCP_CSUM |	\
219 					 PCIE_DESC_RX_UDP_CSUM |	\
220 					 PCIE_DESC_RX_I_IP4_CSUM |	\
221 					 PCIE_DESC_RX_I_TCP_CSUM |	\
222 					 PCIE_DESC_RX_I_UDP_CSUM)
223 #define PCIE_DESC_RX_CSUM_OK_SHIFT	1
224 #define __PCIE_DESC_RX_CSUM_ALL		le16_to_cpu(PCIE_DESC_RX_CSUM_ALL)
225 #define __PCIE_DESC_RX_CSUM_ALL_OK	(__PCIE_DESC_RX_CSUM_ALL >>	\
226 					 PCIE_DESC_RX_CSUM_OK_SHIFT)
227 
228 struct nfp_net_rx_desc {
229 	union {
230 		struct {
231 			__le16 dma_addr_hi; /* High bits of the buf address */
232 			u8 reserved; /* Must be zero */
233 			u8 meta_len_dd; /* Must be zero */
234 
235 			__le32 dma_addr_lo; /* Low bits of the buffer address */
236 		} __packed fld;
237 
238 		struct {
239 			__le16 data_len; /* Length of the frame + meta data */
240 			u8 reserved;
241 			u8 meta_len_dd;	/* Length of meta data prepended +
242 					 * descriptor done flag.
243 					 */
244 
245 			__le16 flags;	/* RX flags. See @PCIE_DESC_RX_* */
246 			__le16 vlan;	/* VLAN if stripped */
247 		} __packed rxd;
248 
249 		__le32 vals[2];
250 	};
251 };
252 
253 #define NFP_NET_META_FIELD_MASK GENMASK(NFP_NET_META_FIELD_SIZE - 1, 0)
254 #define NFP_NET_VLAN_CTAG	0
255 #define NFP_NET_VLAN_STAG	1
256 
257 struct nfp_meta_parsed {
258 	u8 hash_type;
259 	u8 csum_type;
260 	u32 hash;
261 	u32 mark;
262 	u32 portid;
263 	__wsum csum;
264 	struct {
265 		bool stripped;
266 		u8 tpid;
267 		u16 tci;
268 	} vlan;
269 
270 #ifdef CONFIG_NFP_NET_IPSEC
271 	u32 ipsec_saidx;
272 #endif
273 };
274 
275 struct nfp_net_rx_hash {
276 	__be32 hash_type;
277 	__be32 hash;
278 };
279 
280 /**
281  * struct nfp_net_rx_buf - software RX buffer descriptor
282  * @frag:	page fragment buffer
283  * @dma_addr:	DMA mapping address of the buffer
284  */
285 struct nfp_net_rx_buf {
286 	void *frag;
287 	dma_addr_t dma_addr;
288 };
289 
290 /**
291  * struct nfp_net_xsk_rx_buf - software RX XSK buffer descriptor
292  * @dma_addr:	DMA mapping address of the buffer
293  * @xdp:	XSK buffer pool handle (for AF_XDP)
294  */
295 struct nfp_net_xsk_rx_buf {
296 	dma_addr_t dma_addr;
297 	struct xdp_buff *xdp;
298 };
299 
300 /**
301  * struct nfp_net_rx_ring - RX ring structure
302  * @r_vec:      Back pointer to ring vector structure
303  * @cnt:        Size of the queue in number of descriptors
304  * @wr_p:       FL/RX ring write pointer (free running)
305  * @rd_p:       FL/RX ring read pointer (free running)
306  * @idx:        Ring index from Linux's perspective
307  * @fl_qcidx:   Queue Controller Peripheral (QCP) queue index for the freelist
308  * @qcp_fl:     Pointer to base of the QCP freelist queue
309  * @rxbufs:     Array of transmitted FL/RX buffers
310  * @xsk_rxbufs: Array of transmitted FL/RX buffers (for AF_XDP)
311  * @rxds:       Virtual address of FL/RX ring in host memory
312  * @xdp_rxq:    RX-ring info avail for XDP
313  * @dma:        DMA address of the FL/RX ring
314  * @size:       Size, in bytes, of the FL/RX ring (needed to free)
315  */
316 struct nfp_net_rx_ring {
317 	struct nfp_net_r_vector *r_vec;
318 
319 	u32 cnt;
320 	u32 wr_p;
321 	u32 rd_p;
322 
323 	u32 idx;
324 
325 	int fl_qcidx;
326 	u8 __iomem *qcp_fl;
327 
328 	struct nfp_net_rx_buf *rxbufs;
329 	struct nfp_net_xsk_rx_buf *xsk_rxbufs;
330 	struct nfp_net_rx_desc *rxds;
331 
332 	struct xdp_rxq_info xdp_rxq;
333 
334 	dma_addr_t dma;
335 	size_t size;
336 } ____cacheline_aligned;
337 
338 /**
339  * struct nfp_net_r_vector - Per ring interrupt vector configuration
340  * @nfp_net:        Backpointer to nfp_net structure
341  * @napi:           NAPI structure for this ring vec
342  * @tasklet:        ctrl vNIC, tasklet for servicing the r_vec
343  * @queue:          ctrl vNIC, send queue
344  * @lock:           ctrl vNIC, r_vec lock protects @queue
345  * @tx_ring:        Pointer to TX ring
346  * @rx_ring:        Pointer to RX ring
347  * @xdp_ring:	    Pointer to an extra TX ring for XDP
348  * @xsk_pool:	    XSK buffer pool active on vector queue pair (for AF_XDP)
349  * @irq_entry:      MSI-X table entry (use for talking to the device)
350  * @event_ctr:	    Number of interrupt
351  * @rx_dim:	    Dynamic interrupt moderation structure for RX
352  * @tx_dim:	    Dynamic interrupt moderation structure for TX
353  * @rx_sync:	    Seqlock for atomic updates of RX stats
354  * @rx_pkts:        Number of received packets
355  * @rx_bytes:	    Number of received bytes
356  * @rx_drops:	    Number of packets dropped on RX due to lack of resources
357  * @hw_csum_rx_ok:  Counter of packets where the HW checksum was OK
358  * @hw_csum_rx_inner_ok: Counter of packets where the inner HW checksum was OK
359  * @hw_csum_rx_complete: Counter of packets with CHECKSUM_COMPLETE reported
360  * @hw_csum_rx_error:	 Counter of packets with bad checksums
361  * @hw_tls_rx:	    Number of packets with TLS decrypted by hardware
362  * @tx_sync:	    Seqlock for atomic updates of TX stats
363  * @tx_pkts:	    Number of Transmitted packets
364  * @tx_bytes:	    Number of Transmitted bytes
365  * @hw_csum_tx:	    Counter of packets with TX checksum offload requested
366  * @hw_csum_tx_inner:	 Counter of inner TX checksum offload requests
367  * @tx_gather:	    Counter of packets with Gather DMA
368  * @tx_lso:	    Counter of LSO packets sent
369  * @hw_tls_tx:	    Counter of TLS packets sent with crypto offloaded to HW
370  * @tls_tx_fallback:	Counter of TLS packets sent which had to be encrypted
371  *			by the fallback path because packets came out of order
372  * @tls_tx_no_fallback:	Counter of TLS packets not sent because the fallback
373  *			path could not encrypt them
374  * @tx_errors:	    How many TX errors were encountered
375  * @tx_busy:        How often was TX busy (no space)?
376  * @rx_replace_buf_alloc_fail:	Counter of RX buffer allocation failures
377  * @irq_vector:     Interrupt vector number (use for talking to the OS)
378  * @handler:        Interrupt handler for this ring vector
379  * @name:           Name of the interrupt vector
380  * @affinity_mask:  SMP affinity mask for this vector
381  *
382  * This structure ties RX and TX rings to interrupt vectors and a NAPI
383  * context. This currently only supports one RX and TX ring per
384  * interrupt vector but might be extended in the future to allow
385  * association of multiple rings per vector.
386  */
387 struct nfp_net_r_vector {
388 	struct nfp_net *nfp_net;
389 	union {
390 		struct napi_struct napi;
391 		struct {
392 			struct tasklet_struct tasklet;
393 			struct sk_buff_head queue;
394 			spinlock_t lock;
395 		};
396 	};
397 
398 	struct nfp_net_tx_ring *tx_ring;
399 	struct nfp_net_rx_ring *rx_ring;
400 
401 	u16 irq_entry;
402 
403 	u16 event_ctr;
404 	struct dim rx_dim;
405 	struct dim tx_dim;
406 
407 	struct u64_stats_sync rx_sync;
408 	u64 rx_pkts;
409 	u64 rx_bytes;
410 	u64 rx_drops;
411 	u64 hw_csum_rx_ok;
412 	u64 hw_csum_rx_inner_ok;
413 	u64 hw_csum_rx_complete;
414 	u64 hw_tls_rx;
415 
416 	u64 hw_csum_rx_error;
417 	u64 rx_replace_buf_alloc_fail;
418 
419 	struct nfp_net_tx_ring *xdp_ring;
420 	struct xsk_buff_pool *xsk_pool;
421 
422 	struct u64_stats_sync tx_sync;
423 	u64 tx_pkts;
424 	u64 tx_bytes;
425 
426 	u64 ____cacheline_aligned_in_smp hw_csum_tx;
427 	u64 hw_csum_tx_inner;
428 	u64 tx_gather;
429 	u64 tx_lso;
430 	u64 hw_tls_tx;
431 
432 	u64 tls_tx_fallback;
433 	u64 tls_tx_no_fallback;
434 	u64 tx_errors;
435 	u64 tx_busy;
436 
437 	/* Cold data follows */
438 
439 	u32 irq_vector;
440 	irq_handler_t handler;
441 	char name[IFNAMSIZ + 8];
442 	cpumask_t affinity_mask;
443 } ____cacheline_aligned;
444 
445 /* Firmware version as it is written in the 32bit value in the BAR */
446 struct nfp_net_fw_version {
447 	u8 minor;
448 	u8 major;
449 	u8 class;
450 
451 	/* This byte can be exploited for more use, currently,
452 	 * BIT0: dp type, BIT[7:1]: reserved
453 	 */
454 	u8 extend;
455 } __packed;
456 
457 static inline bool nfp_net_fw_ver_eq(struct nfp_net_fw_version *fw_ver,
458 				     u8 extend, u8 class, u8 major, u8 minor)
459 {
460 	return fw_ver->extend == extend &&
461 	       fw_ver->class == class &&
462 	       fw_ver->major == major &&
463 	       fw_ver->minor == minor;
464 }
465 
466 struct nfp_stat_pair {
467 	u64 pkts;
468 	u64 bytes;
469 };
470 
471 /**
472  * struct nfp_net_dp - NFP network device datapath data structure
473  * @dev:		Backpointer to struct device
474  * @netdev:		Backpointer to net_device structure
475  * @is_vf:		Is the driver attached to a VF?
476  * @chained_metadata_format:  Firemware will use new metadata format
477  * @ktls_tx:		Is kTLS TX enabled?
478  * @rx_dma_dir:		Mapping direction for RX buffers
479  * @rx_dma_off:		Offset at which DMA packets (for XDP headroom)
480  * @rx_offset:		Offset in the RX buffers where packet data starts
481  * @ctrl:		Local copy of the control register/word.
482  * @ctrl_w1:		Local copy of the control register/word1.
483  * @fl_bufsz:		Currently configured size of the freelist buffers
484  * @xdp_prog:		Installed XDP program
485  * @tx_rings:		Array of pre-allocated TX ring structures
486  * @rx_rings:		Array of pre-allocated RX ring structures
487  * @ctrl_bar:		Pointer to mapped control BAR
488  *
489  * @ops:		Callbacks and parameters for this vNIC's NFD version
490  * @txrwb:		TX pointer write back area (indexed by queue id)
491  * @txrwb_dma:		TX pointer write back area DMA address
492  * @txd_cnt:		Size of the TX ring in number of min size packets
493  * @rxd_cnt:		Size of the RX ring in number of min size packets
494  * @num_r_vecs:		Number of used ring vectors
495  * @num_tx_rings:	Currently configured number of TX rings
496  * @num_stack_tx_rings:	Number of TX rings used by the stack (not XDP)
497  * @num_rx_rings:	Currently configured number of RX rings
498  * @mtu:		Device MTU
499  * @xsk_pools:		XSK buffer pools, @max_r_vecs in size (for AF_XDP).
500  */
501 struct nfp_net_dp {
502 	struct device *dev;
503 	struct net_device *netdev;
504 
505 	u8 is_vf:1;
506 	u8 chained_metadata_format:1;
507 	u8 ktls_tx:1;
508 
509 	u8 rx_dma_dir;
510 	u8 rx_offset;
511 
512 	u32 rx_dma_off;
513 
514 	u32 ctrl;
515 	u32 ctrl_w1;
516 	u32 fl_bufsz;
517 
518 	struct bpf_prog *xdp_prog;
519 
520 	struct nfp_net_tx_ring *tx_rings;
521 	struct nfp_net_rx_ring *rx_rings;
522 
523 	u8 __iomem *ctrl_bar;
524 
525 	/* Cold data follows */
526 
527 	const struct nfp_dp_ops *ops;
528 
529 	u64 *txrwb;
530 	dma_addr_t txrwb_dma;
531 
532 	unsigned int txd_cnt;
533 	unsigned int rxd_cnt;
534 
535 	unsigned int num_r_vecs;
536 
537 	unsigned int num_tx_rings;
538 	unsigned int num_stack_tx_rings;
539 	unsigned int num_rx_rings;
540 
541 	unsigned int mtu;
542 
543 	struct xsk_buff_pool **xsk_pools;
544 };
545 
546 /**
547  * struct nfp_net - NFP network device structure
548  * @dp:			Datapath structure
549  * @dev_info:		NFP ASIC params
550  * @id:			vNIC id within the PF (0 for VFs)
551  * @fw_ver:		Firmware version
552  * @cap:                Capabilities advertised by the Firmware
553  * @cap_w1:             Extended capabilities word advertised by the Firmware
554  * @max_mtu:            Maximum support MTU advertised by the Firmware
555  * @rss_hfunc:		RSS selected hash function
556  * @rss_cfg:            RSS configuration
557  * @rss_key:            RSS secret key
558  * @rss_itbl:           RSS indirection table
559  * @xdp:		Information about the driver XDP program
560  * @xdp_hw:		Information about the HW XDP program
561  * @max_r_vecs:		Number of allocated interrupt vectors for RX/TX
562  * @max_tx_rings:       Maximum number of TX rings supported by the Firmware
563  * @max_rx_rings:       Maximum number of RX rings supported by the Firmware
564  * @stride_rx:		Queue controller RX queue spacing
565  * @stride_tx:		Queue controller TX queue spacing
566  * @r_vecs:             Pre-allocated array of ring vectors
567  * @irq_entries:        Pre-allocated array of MSI-X entries
568  * @lsc_handler:        Handler for Link State Change interrupt
569  * @lsc_name:           Name for Link State Change interrupt
570  * @exn_handler:        Handler for Exception interrupt
571  * @exn_name:           Name for Exception interrupt
572  * @shared_handler:     Handler for shared interrupts
573  * @shared_name:        Name for shared interrupt
574  * @reconfig_lock:	Protects @reconfig_posted, @reconfig_timer_active,
575  *			@reconfig_sync_present and HW reconfiguration request
576  *			regs/machinery from async requests (sync must take
577  *			@bar_lock)
578  * @reconfig_posted:	Pending reconfig bits coming from async sources
579  * @reconfig_timer_active:  Timer for reading reconfiguration results is pending
580  * @reconfig_sync_present:  Some thread is performing synchronous reconfig
581  * @reconfig_timer:	Timer for async reading of reconfig results
582  * @reconfig_in_progress_update:	Update FW is processing now (debug only)
583  * @bar_lock:		vNIC config BAR access lock, protects: update,
584  *			mailbox area, crypto TLV
585  * @link_up:            Is the link up?
586  * @link_status_lock:	Protects @link_* and ensures atomicity with BAR reading
587  * @rx_coalesce_adapt_on:   Is RX interrupt moderation adaptive?
588  * @tx_coalesce_adapt_on:   Is TX interrupt moderation adaptive?
589  * @rx_coalesce_usecs:      RX interrupt moderation usecs delay parameter
590  * @rx_coalesce_max_frames: RX interrupt moderation frame count parameter
591  * @tx_coalesce_usecs:      TX interrupt moderation usecs delay parameter
592  * @tx_coalesce_max_frames: TX interrupt moderation frame count parameter
593  * @qcp_cfg:            Pointer to QCP queue used for configuration notification
594  * @tx_bar:             Pointer to mapped TX queues
595  * @rx_bar:             Pointer to mapped FL/RX queues
596  * @xa_ipsec:           IPsec xarray SA data
597  * @tlv_caps:		Parsed TLV capabilities
598  * @ktls_tx_conn_cnt:	Number of offloaded kTLS TX connections
599  * @ktls_rx_conn_cnt:	Number of offloaded kTLS RX connections
600  * @ktls_conn_id_gen:	Trivial generator for kTLS connection ids (for TX)
601  * @ktls_no_space:	Counter of firmware rejecting kTLS connection due to
602  *			lack of space
603  * @ktls_rx_resync_req:	Counter of TLS RX resync requested
604  * @ktls_rx_resync_ign:	Counter of TLS RX resync requests ignored
605  * @ktls_rx_resync_sent:    Counter of TLS RX resync completed
606  * @mbox_cmsg:		Common Control Message via vNIC mailbox state
607  * @mbox_cmsg.queue:	CCM mbox queue of pending messages
608  * @mbox_cmsg.wq:	CCM mbox wait queue of waiting processes
609  * @mbox_cmsg.workq:	CCM mbox work queue for @wait_work and @runq_work
610  * @mbox_cmsg.wait_work:    CCM mbox posted msg reconfig wait work
611  * @mbox_cmsg.runq_work:    CCM mbox posted msg queue runner work
612  * @mbox_cmsg.tag:	CCM mbox message tag allocator
613  * @debugfs_dir:	Device directory in debugfs
614  * @vnic_list:		Entry on device vNIC list
615  * @pdev:		Backpointer to PCI device
616  * @app:		APP handle if available
617  * @vnic_no_name:	For non-port PF vNIC make ndo_get_phys_port_name return
618  *			-EOPNOTSUPP to keep backwards compatibility (set by app)
619  * @port:		Pointer to nfp_port structure if vNIC is a port
620  * @app_priv:		APP private data for this vNIC
621  */
622 struct nfp_net {
623 	struct nfp_net_dp dp;
624 
625 	const struct nfp_dev_info *dev_info;
626 	struct nfp_net_fw_version fw_ver;
627 
628 	u32 id;
629 
630 	u32 cap;
631 	u32 cap_w1;
632 	u32 max_mtu;
633 
634 	u8 rss_hfunc;
635 	u32 rss_cfg;
636 	u8 rss_key[NFP_NET_CFG_RSS_KEY_SZ];
637 	u8 rss_itbl[NFP_NET_CFG_RSS_ITBL_SZ];
638 
639 	struct xdp_attachment_info xdp;
640 	struct xdp_attachment_info xdp_hw;
641 
642 	unsigned int max_tx_rings;
643 	unsigned int max_rx_rings;
644 
645 	int stride_tx;
646 	int stride_rx;
647 
648 	unsigned int max_r_vecs;
649 	struct nfp_net_r_vector r_vecs[NFP_NET_MAX_R_VECS];
650 	struct msix_entry irq_entries[NFP_NET_MAX_IRQS];
651 
652 	irq_handler_t lsc_handler;
653 	char lsc_name[IFNAMSIZ + 8];
654 
655 	irq_handler_t exn_handler;
656 	char exn_name[IFNAMSIZ + 8];
657 
658 	irq_handler_t shared_handler;
659 	char shared_name[IFNAMSIZ + 8];
660 
661 	bool link_up;
662 	spinlock_t link_status_lock;
663 
664 	spinlock_t reconfig_lock;
665 	u32 reconfig_posted;
666 	bool reconfig_timer_active;
667 	bool reconfig_sync_present;
668 	struct timer_list reconfig_timer;
669 	u32 reconfig_in_progress_update;
670 
671 	struct semaphore bar_lock;
672 
673 	bool rx_coalesce_adapt_on;
674 	bool tx_coalesce_adapt_on;
675 	u32 rx_coalesce_usecs;
676 	u32 rx_coalesce_max_frames;
677 	u32 tx_coalesce_usecs;
678 	u32 tx_coalesce_max_frames;
679 
680 	u8 __iomem *qcp_cfg;
681 
682 	u8 __iomem *tx_bar;
683 	u8 __iomem *rx_bar;
684 
685 #ifdef CONFIG_NFP_NET_IPSEC
686 	struct xarray xa_ipsec;
687 #endif
688 
689 	struct nfp_net_tlv_caps tlv_caps;
690 
691 	unsigned int ktls_tx_conn_cnt;
692 	unsigned int ktls_rx_conn_cnt;
693 
694 	atomic64_t ktls_conn_id_gen;
695 
696 	atomic_t ktls_no_space;
697 	atomic_t ktls_rx_resync_req;
698 	atomic_t ktls_rx_resync_ign;
699 	atomic_t ktls_rx_resync_sent;
700 
701 	struct {
702 		struct sk_buff_head queue;
703 		wait_queue_head_t wq;
704 		struct workqueue_struct *workq;
705 		struct work_struct wait_work;
706 		struct work_struct runq_work;
707 		u16 tag;
708 	} mbox_cmsg;
709 
710 	struct dentry *debugfs_dir;
711 
712 	struct list_head vnic_list;
713 
714 	struct pci_dev *pdev;
715 	struct nfp_app *app;
716 
717 	bool vnic_no_name;
718 
719 	struct nfp_port *port;
720 
721 	void *app_priv;
722 };
723 
724 /* Functions to read/write from/to a BAR
725  * Performs any endian conversion necessary.
726  */
727 static inline u16 nn_readb(struct nfp_net *nn, int off)
728 {
729 	return readb(nn->dp.ctrl_bar + off);
730 }
731 
732 static inline void nn_writeb(struct nfp_net *nn, int off, u8 val)
733 {
734 	writeb(val, nn->dp.ctrl_bar + off);
735 }
736 
737 static inline u16 nn_readw(struct nfp_net *nn, int off)
738 {
739 	return readw(nn->dp.ctrl_bar + off);
740 }
741 
742 static inline void nn_writew(struct nfp_net *nn, int off, u16 val)
743 {
744 	writew(val, nn->dp.ctrl_bar + off);
745 }
746 
747 static inline u32 nn_readl(struct nfp_net *nn, int off)
748 {
749 	return readl(nn->dp.ctrl_bar + off);
750 }
751 
752 static inline void nn_writel(struct nfp_net *nn, int off, u32 val)
753 {
754 	writel(val, nn->dp.ctrl_bar + off);
755 }
756 
757 static inline u64 nn_readq(struct nfp_net *nn, int off)
758 {
759 	return readq(nn->dp.ctrl_bar + off);
760 }
761 
762 static inline void nn_writeq(struct nfp_net *nn, int off, u64 val)
763 {
764 	writeq(val, nn->dp.ctrl_bar + off);
765 }
766 
767 /* Flush posted PCI writes by reading something without side effects */
768 static inline void nn_pci_flush(struct nfp_net *nn)
769 {
770 	nn_readl(nn, NFP_NET_CFG_VERSION);
771 }
772 
773 /* Queue Controller Peripheral access functions and definitions.
774  *
775  * Some of the BARs of the NFP are mapped to portions of the Queue
776  * Controller Peripheral (QCP) address space on the NFP.  A QCP queue
777  * has a read and a write pointer (as well as a size and flags,
778  * indicating overflow etc).  The QCP offers a number of different
779  * operation on queue pointers, but here we only offer function to
780  * either add to a pointer or to read the pointer value.
781  */
782 #define NFP_QCP_QUEUE_ADDR_SZ			0x800
783 #define NFP_QCP_QUEUE_OFF(_x)			((_x) * NFP_QCP_QUEUE_ADDR_SZ)
784 #define NFP_QCP_QUEUE_ADD_RPTR			0x0000
785 #define NFP_QCP_QUEUE_ADD_WPTR			0x0004
786 #define NFP_QCP_QUEUE_STS_LO			0x0008
787 #define NFP_QCP_QUEUE_STS_LO_READPTR_mask	0x3ffff
788 #define NFP_QCP_QUEUE_STS_HI			0x000c
789 #define NFP_QCP_QUEUE_STS_HI_WRITEPTR_mask	0x3ffff
790 
791 /* nfp_qcp_ptr - Read or Write Pointer of a queue */
792 enum nfp_qcp_ptr {
793 	NFP_QCP_READ_PTR = 0,
794 	NFP_QCP_WRITE_PTR
795 };
796 
797 /**
798  * nfp_qcp_rd_ptr_add() - Add the value to the read pointer of a queue
799  *
800  * @q:   Base address for queue structure
801  * @val: Value to add to the queue pointer
802  */
803 static inline void nfp_qcp_rd_ptr_add(u8 __iomem *q, u32 val)
804 {
805 	writel(val, q + NFP_QCP_QUEUE_ADD_RPTR);
806 }
807 
808 /**
809  * nfp_qcp_wr_ptr_add() - Add the value to the write pointer of a queue
810  *
811  * @q:   Base address for queue structure
812  * @val: Value to add to the queue pointer
813  */
814 static inline void nfp_qcp_wr_ptr_add(u8 __iomem *q, u32 val)
815 {
816 	writel(val, q + NFP_QCP_QUEUE_ADD_WPTR);
817 }
818 
819 static inline u32 _nfp_qcp_read(u8 __iomem *q, enum nfp_qcp_ptr ptr)
820 {
821 	u32 off;
822 	u32 val;
823 
824 	if (ptr == NFP_QCP_READ_PTR)
825 		off = NFP_QCP_QUEUE_STS_LO;
826 	else
827 		off = NFP_QCP_QUEUE_STS_HI;
828 
829 	val = readl(q + off);
830 
831 	if (ptr == NFP_QCP_READ_PTR)
832 		return val & NFP_QCP_QUEUE_STS_LO_READPTR_mask;
833 	else
834 		return val & NFP_QCP_QUEUE_STS_HI_WRITEPTR_mask;
835 }
836 
837 /**
838  * nfp_qcp_rd_ptr_read() - Read the current read pointer value for a queue
839  * @q:  Base address for queue structure
840  *
841  * Return: Value read.
842  */
843 static inline u32 nfp_qcp_rd_ptr_read(u8 __iomem *q)
844 {
845 	return _nfp_qcp_read(q, NFP_QCP_READ_PTR);
846 }
847 
848 /**
849  * nfp_qcp_wr_ptr_read() - Read the current write pointer value for a queue
850  * @q:  Base address for queue structure
851  *
852  * Return: Value read.
853  */
854 static inline u32 nfp_qcp_wr_ptr_read(u8 __iomem *q)
855 {
856 	return _nfp_qcp_read(q, NFP_QCP_WRITE_PTR);
857 }
858 
859 u32 nfp_qcp_queue_offset(const struct nfp_dev_info *dev_info, u16 queue);
860 
861 static inline bool nfp_net_is_data_vnic(struct nfp_net *nn)
862 {
863 	WARN_ON_ONCE(!nn->dp.netdev && nn->port);
864 	return !!nn->dp.netdev;
865 }
866 
867 static inline bool nfp_net_running(struct nfp_net *nn)
868 {
869 	return nn->dp.ctrl & NFP_NET_CFG_CTRL_ENABLE;
870 }
871 
872 static inline const char *nfp_net_name(struct nfp_net *nn)
873 {
874 	return nn->dp.netdev ? nn->dp.netdev->name : "ctrl";
875 }
876 
877 static inline void nfp_ctrl_lock(struct nfp_net *nn)
878 	__acquires(&nn->r_vecs[0].lock)
879 {
880 	spin_lock_bh(&nn->r_vecs[0].lock);
881 }
882 
883 static inline void nfp_ctrl_unlock(struct nfp_net *nn)
884 	__releases(&nn->r_vecs[0].lock)
885 {
886 	spin_unlock_bh(&nn->r_vecs[0].lock);
887 }
888 
889 static inline void nn_ctrl_bar_lock(struct nfp_net *nn)
890 {
891 	down(&nn->bar_lock);
892 }
893 
894 static inline bool nn_ctrl_bar_trylock(struct nfp_net *nn)
895 {
896 	return !down_trylock(&nn->bar_lock);
897 }
898 
899 static inline void nn_ctrl_bar_unlock(struct nfp_net *nn)
900 {
901 	up(&nn->bar_lock);
902 }
903 
904 /* Globals */
905 extern const char nfp_driver_version[];
906 
907 extern const struct net_device_ops nfp_nfd3_netdev_ops;
908 extern const struct net_device_ops nfp_nfdk_netdev_ops;
909 
910 static inline bool nfp_netdev_is_nfp_net(struct net_device *netdev)
911 {
912 	return netdev->netdev_ops == &nfp_nfd3_netdev_ops ||
913 	       netdev->netdev_ops == &nfp_nfdk_netdev_ops;
914 }
915 
916 static inline int nfp_net_coalesce_para_check(u32 usecs, u32 pkts)
917 {
918 	if ((usecs >= ((1 << 16) - 1)) || (pkts >= ((1 << 16) - 1)))
919 		return -EINVAL;
920 
921 	return 0;
922 }
923 
924 /* Prototypes */
925 void nfp_net_get_fw_version(struct nfp_net_fw_version *fw_ver,
926 			    void __iomem *ctrl_bar);
927 
928 struct nfp_net *
929 nfp_net_alloc(struct pci_dev *pdev, const struct nfp_dev_info *dev_info,
930 	      void __iomem *ctrl_bar, bool needs_netdev,
931 	      unsigned int max_tx_rings, unsigned int max_rx_rings);
932 void nfp_net_free(struct nfp_net *nn);
933 
934 int nfp_net_init(struct nfp_net *nn);
935 void nfp_net_clean(struct nfp_net *nn);
936 
937 int nfp_ctrl_open(struct nfp_net *nn);
938 void nfp_ctrl_close(struct nfp_net *nn);
939 
940 void nfp_net_set_ethtool_ops(struct net_device *netdev);
941 void nfp_net_info(struct nfp_net *nn);
942 int __nfp_net_reconfig(struct nfp_net *nn, u32 update);
943 int nfp_net_reconfig(struct nfp_net *nn, u32 update);
944 unsigned int nfp_net_rss_key_sz(struct nfp_net *nn);
945 void nfp_net_rss_write_itbl(struct nfp_net *nn);
946 void nfp_net_rss_write_key(struct nfp_net *nn);
947 void nfp_net_coalesce_write_cfg(struct nfp_net *nn);
948 int nfp_net_mbox_lock(struct nfp_net *nn, unsigned int data_size);
949 int nfp_net_mbox_reconfig(struct nfp_net *nn, u32 mbox_cmd);
950 int nfp_net_mbox_reconfig_and_unlock(struct nfp_net *nn, u32 mbox_cmd);
951 void nfp_net_mbox_reconfig_post(struct nfp_net *nn, u32 update);
952 int nfp_net_mbox_reconfig_wait_posted(struct nfp_net *nn);
953 
954 unsigned int
955 nfp_net_irqs_alloc(struct pci_dev *pdev, struct msix_entry *irq_entries,
956 		   unsigned int min_irqs, unsigned int want_irqs);
957 void nfp_net_irqs_disable(struct pci_dev *pdev);
958 void
959 nfp_net_irqs_assign(struct nfp_net *nn, struct msix_entry *irq_entries,
960 		    unsigned int n);
961 struct sk_buff *
962 nfp_net_tls_tx(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec,
963 	       struct sk_buff *skb, u64 *tls_handle, int *nr_frags);
964 void nfp_net_tls_tx_undo(struct sk_buff *skb, u64 tls_handle);
965 
966 struct nfp_net_dp *nfp_net_clone_dp(struct nfp_net *nn);
967 int nfp_net_ring_reconfig(struct nfp_net *nn, struct nfp_net_dp *new,
968 			  struct netlink_ext_ack *extack);
969 
970 #ifdef CONFIG_NFP_DEBUG
971 void nfp_net_debugfs_create(void);
972 void nfp_net_debugfs_destroy(void);
973 struct dentry *nfp_net_debugfs_device_add(struct pci_dev *pdev);
974 void nfp_net_debugfs_vnic_add(struct nfp_net *nn, struct dentry *ddir);
975 void nfp_net_debugfs_dir_clean(struct dentry **dir);
976 #else
977 static inline void nfp_net_debugfs_create(void)
978 {
979 }
980 
981 static inline void nfp_net_debugfs_destroy(void)
982 {
983 }
984 
985 static inline struct dentry *nfp_net_debugfs_device_add(struct pci_dev *pdev)
986 {
987 	return NULL;
988 }
989 
990 static inline void
991 nfp_net_debugfs_vnic_add(struct nfp_net *nn, struct dentry *ddir)
992 {
993 }
994 
995 static inline void nfp_net_debugfs_dir_clean(struct dentry **dir)
996 {
997 }
998 #endif /* CONFIG_NFP_DEBUG */
999 
1000 #endif /* _NFP_NET_H_ */
1001