1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* Copyright (c) 2018, Intel Corporation. */ 3 4 #ifndef _ICE_TXRX_H_ 5 #define _ICE_TXRX_H_ 6 7 #include "ice_type.h" 8 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 16 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. 20 */ 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) 25 26 #define ICE_RX_BUF_WRITE 16 /* Must be power of 2 */ 27 #define ICE_MAX_TXQ_PER_TXQG 128 28 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 33 * frame. 34 * 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 37 * receive path. 38 */ 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)) 43 44 /** 45 * ice_compute_pad - compute the padding 46 * @rx_buf_len: buffer length 47 * 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 52 */ 53 static inline int ice_compute_pad(int rx_buf_len) 54 { 55 int half_page_size; 56 57 half_page_size = ALIGN(rx_buf_len, PAGE_SIZE / 2); 58 return SKB_WITH_OVERHEAD(half_page_size) - rx_buf_len; 59 } 60 61 /** 62 * ice_skb_pad - determine the padding that we can supply 63 * 64 * Figure out the right Rx buffer size and based on that calculate the 65 * padding 66 */ 67 static inline int ice_skb_pad(void) 68 { 69 int rx_buf_len; 70 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. 73 * 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. 77 */ 78 if (ICE_2K_TOO_SMALL_WITH_PADDING) 79 rx_buf_len = ICE_RXBUF_3072 + SKB_DATA_ALIGN(NET_IP_ALIGN); 80 else 81 rx_buf_len = ICE_RXBUF_1536; 82 83 /* if needed make room for NET_IP_ALIGN */ 84 rx_buf_len -= NET_IP_ALIGN; 85 86 return ice_compute_pad(rx_buf_len); 87 } 88 89 #define ICE_SKB_PAD ice_skb_pad() 90 #else 91 #define ICE_2K_TOO_SMALL_WITH_PADDING false 92 #define ICE_SKB_PAD (NET_SKB_PAD + NET_IP_ALIGN) 93 #endif 94 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 100 * the Tx path. 101 */ 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) 113 114 #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. 119 */ 120 #define ICE_TX_FLAGS_DUMMY_PKT BIT(3) 121 #define ICE_TX_FLAGS_IPV4 BIT(5) 122 #define ICE_TX_FLAGS_IPV6 BIT(6) 123 #define ICE_TX_FLAGS_TUNNEL BIT(7) 124 #define ICE_TX_FLAGS_VLAN_M 0xffff0000 125 #define ICE_TX_FLAGS_VLAN_PR_M 0xe0000000 126 #define ICE_TX_FLAGS_VLAN_PR_S 29 127 #define ICE_TX_FLAGS_VLAN_S 16 128 129 #define ICE_XDP_PASS 0 130 #define ICE_XDP_CONSUMED BIT(0) 131 #define ICE_XDP_TX BIT(1) 132 #define ICE_XDP_REDIR BIT(2) 133 134 #define ICE_RX_DMA_ATTR \ 135 (DMA_ATTR_SKIP_CPU_SYNC | DMA_ATTR_WEAK_ORDERING) 136 137 #define ICE_ETH_PKT_HDR_PAD (ETH_HLEN + ETH_FCS_LEN + (VLAN_HLEN * 2)) 138 139 #define ICE_TXD_LAST_DESC_CMD (ICE_TX_DESC_CMD_EOP | ICE_TX_DESC_CMD_RS) 140 141 struct ice_tx_buf { 142 struct ice_tx_desc *next_to_watch; 143 union { 144 struct sk_buff *skb; 145 void *raw_buf; /* used for XDP */ 146 }; 147 unsigned int bytecount; 148 unsigned short gso_segs; 149 u32 tx_flags; 150 DEFINE_DMA_UNMAP_LEN(len); 151 DEFINE_DMA_UNMAP_ADDR(dma); 152 }; 153 154 struct ice_tx_offload_params { 155 u64 cd_qw1; 156 struct ice_ring *tx_ring; 157 u32 td_cmd; 158 u32 td_offset; 159 u32 td_l2tag1; 160 u32 cd_tunnel_params; 161 u16 cd_l2tag2; 162 u8 header_len; 163 }; 164 165 struct ice_rx_buf { 166 union { 167 struct { 168 struct sk_buff *skb; 169 dma_addr_t dma; 170 struct page *page; 171 unsigned int page_offset; 172 u16 pagecnt_bias; 173 }; 174 struct { 175 struct xdp_buff *xdp; 176 }; 177 }; 178 }; 179 180 struct ice_q_stats { 181 u64 pkts; 182 u64 bytes; 183 }; 184 185 struct ice_txq_stats { 186 u64 restart_q; 187 u64 tx_busy; 188 u64 tx_linearize; 189 int prev_pkt; /* negative if no pending Tx descriptors */ 190 }; 191 192 struct ice_rxq_stats { 193 u64 non_eop_descs; 194 u64 alloc_page_failed; 195 u64 alloc_buf_failed; 196 u64 gro_dropped; /* GRO returned dropped */ 197 }; 198 199 /* this enum matches hardware bits and is meant to be used by DYN_CTLN 200 * registers and QINT registers or more generally anywhere in the manual 201 * mentioning ITR_INDX, ITR_NONE cannot be used as an index 'n' into any 202 * register but instead is a special value meaning "don't update" ITR0/1/2. 203 */ 204 enum ice_dyn_idx_t { 205 ICE_IDX_ITR0 = 0, 206 ICE_IDX_ITR1 = 1, 207 ICE_IDX_ITR2 = 2, 208 ICE_ITR_NONE = 3 /* ITR_NONE must not be used as an index */ 209 }; 210 211 /* Header split modes defined by DTYPE field of Rx RLAN context */ 212 enum ice_rx_dtype { 213 ICE_RX_DTYPE_NO_SPLIT = 0, 214 ICE_RX_DTYPE_HEADER_SPLIT = 1, 215 ICE_RX_DTYPE_SPLIT_ALWAYS = 2, 216 }; 217 218 /* indices into GLINT_ITR registers */ 219 #define ICE_RX_ITR ICE_IDX_ITR0 220 #define ICE_TX_ITR ICE_IDX_ITR1 221 #define ICE_ITR_8K 124 222 #define ICE_ITR_20K 50 223 #define ICE_ITR_MAX 8160 224 #define ICE_DFLT_TX_ITR (ICE_ITR_20K | ICE_ITR_DYNAMIC) 225 #define ICE_DFLT_RX_ITR (ICE_ITR_20K | ICE_ITR_DYNAMIC) 226 #define ICE_ITR_DYNAMIC 0x8000 /* used as flag for itr_setting */ 227 #define ITR_IS_DYNAMIC(setting) (!!((setting) & ICE_ITR_DYNAMIC)) 228 #define ITR_TO_REG(setting) ((setting) & ~ICE_ITR_DYNAMIC) 229 #define ICE_ITR_GRAN_S 1 /* ITR granularity is always 2us */ 230 #define ICE_ITR_GRAN_US BIT(ICE_ITR_GRAN_S) 231 #define ICE_ITR_MASK 0x1FFE /* ITR register value alignment mask */ 232 #define ITR_REG_ALIGN(setting) ((setting) & ICE_ITR_MASK) 233 234 #define ICE_ITR_ADAPTIVE_MIN_INC 0x0002 235 #define ICE_ITR_ADAPTIVE_MIN_USECS 0x0002 236 #define ICE_ITR_ADAPTIVE_MAX_USECS 0x00FA 237 #define ICE_ITR_ADAPTIVE_LATENCY 0x8000 238 #define ICE_ITR_ADAPTIVE_BULK 0x0000 239 240 #define ICE_DFLT_INTRL 0 241 #define ICE_MAX_INTRL 236 242 243 #define ICE_WB_ON_ITR_USECS 2 244 #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. 248 */ 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) 255 256 /* Legacy or Advanced Mode Queue */ 257 #define ICE_TX_ADVANCED 0 258 #define ICE_TX_LEGACY 1 259 260 /* descriptor ring, associated with a VSI */ 261 struct ice_ring { 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 */ 269 u8 __iomem *tail; 270 union { 271 struct ice_tx_buf *tx_buf; 272 struct ice_rx_buf *rx_buf; 273 }; 274 /* CL2 - 2nd cacheline starts here */ 275 u16 q_index; /* Queue number of ring */ 276 u16 q_handle; /* Queue handle per TC */ 277 278 u8 ring_active:1; /* is ring online or not */ 279 280 u16 count; /* Number of descriptors */ 281 u16 reg_idx; /* HW register index of the ring */ 282 283 /* used in interrupt processing */ 284 u16 next_to_use; 285 u16 next_to_clean; 286 u16 next_to_alloc; 287 288 /* stats structs */ 289 struct ice_q_stats stats; 290 struct u64_stats_sync syncp; 291 union { 292 struct ice_txq_stats tx_stats; 293 struct ice_rxq_stats rx_stats; 294 }; 295 296 struct rcu_head rcu; /* to avoid race on free */ 297 struct bpf_prog *xdp_prog; 298 struct xsk_buff_pool *xsk_pool; 299 /* CL3 - 3rd cacheline starts here */ 300 struct xdp_rxq_info xdp_rxq; 301 /* CLX - the below items are only accessed infrequently and should be 302 * in their own cache line if possible 303 */ 304 #define ICE_TX_FLAGS_RING_XDP BIT(0) 305 #define ICE_RX_FLAGS_RING_BUILD_SKB BIT(1) 306 u8 flags; 307 dma_addr_t dma; /* physical address of ring */ 308 unsigned int size; /* length of descriptor ring in bytes */ 309 u32 txq_teid; /* Added Tx queue TEID */ 310 u16 rx_buf_len; 311 u8 dcb_tc; /* Traffic class of ring */ 312 } ____cacheline_internodealigned_in_smp; 313 314 static inline bool ice_ring_uses_build_skb(struct ice_ring *ring) 315 { 316 return !!(ring->flags & ICE_RX_FLAGS_RING_BUILD_SKB); 317 } 318 319 static inline void ice_set_ring_build_skb_ena(struct ice_ring *ring) 320 { 321 ring->flags |= ICE_RX_FLAGS_RING_BUILD_SKB; 322 } 323 324 static inline void ice_clear_ring_build_skb_ena(struct ice_ring *ring) 325 { 326 ring->flags &= ~ICE_RX_FLAGS_RING_BUILD_SKB; 327 } 328 329 static inline bool ice_ring_is_xdp(struct ice_ring *ring) 330 { 331 return !!(ring->flags & ICE_TX_FLAGS_RING_XDP); 332 } 333 334 struct ice_ring_container { 335 /* head of linked-list of rings */ 336 struct ice_ring *ring; 337 unsigned long next_update; /* jiffies value of next queue update */ 338 unsigned int total_bytes; /* total bytes processed this int */ 339 unsigned int total_pkts; /* total packets processed this int */ 340 u16 itr_idx; /* index in the interrupt vector */ 341 u16 target_itr; /* value in usecs divided by the hw->itr_gran */ 342 u16 current_itr; /* value in usecs divided by the hw->itr_gran */ 343 /* high bit set means dynamic ITR, rest is used to store user 344 * readable ITR value in usecs and must be converted before programming 345 * to a register. 346 */ 347 u16 itr_setting; 348 }; 349 350 struct ice_coalesce_stored { 351 u16 itr_tx; 352 u16 itr_rx; 353 u8 intrl; 354 }; 355 356 /* iterator for handling rings in ring container */ 357 #define ice_for_each_ring(pos, head) \ 358 for (pos = (head).ring; pos; pos = pos->next) 359 360 static inline unsigned int ice_rx_pg_order(struct ice_ring *ring) 361 { 362 #if (PAGE_SIZE < 8192) 363 if (ring->rx_buf_len > (PAGE_SIZE / 2)) 364 return 1; 365 #endif 366 return 0; 367 } 368 369 #define ice_rx_pg_size(_ring) (PAGE_SIZE << ice_rx_pg_order(_ring)) 370 371 union ice_32b_rx_flex_desc; 372 373 bool ice_alloc_rx_bufs(struct ice_ring *rxr, u16 cleaned_count); 374 netdev_tx_t ice_start_xmit(struct sk_buff *skb, struct net_device *netdev); 375 void ice_clean_tx_ring(struct ice_ring *tx_ring); 376 void ice_clean_rx_ring(struct ice_ring *rx_ring); 377 int ice_setup_tx_ring(struct ice_ring *tx_ring); 378 int ice_setup_rx_ring(struct ice_ring *rx_ring); 379 void ice_free_tx_ring(struct ice_ring *tx_ring); 380 void ice_free_rx_ring(struct ice_ring *rx_ring); 381 int ice_napi_poll(struct napi_struct *napi, int budget); 382 int 383 ice_prgm_fdir_fltr(struct ice_vsi *vsi, struct ice_fltr_desc *fdir_desc, 384 u8 *raw_packet); 385 int ice_clean_rx_irq(struct ice_ring *rx_ring, int budget); 386 void ice_clean_ctrl_tx_irq(struct ice_ring *tx_ring); 387 #endif /* _ICE_TXRX_H_ */ 388