1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* Copyright (c) 2019, Intel Corporation. */ 3 4 #ifndef _ICE_TXRX_LIB_H_ 5 #define _ICE_TXRX_LIB_H_ 6 #include "ice.h" 7 8 /** 9 * ice_test_staterr - tests bits in Rx descriptor status and error fields 10 * @status_err_n: Rx descriptor status_error0 or status_error1 bits 11 * @stat_err_bits: value to mask 12 * 13 * This function does some fast chicanery in order to return the 14 * value of the mask which is really only used for boolean tests. 15 * The status_error_len doesn't need to be shifted because it begins 16 * at offset zero. 17 */ 18 static inline bool 19 ice_test_staterr(__le16 status_err_n, const u16 stat_err_bits) 20 { 21 return !!(status_err_n & cpu_to_le16(stat_err_bits)); 22 } 23 24 /** 25 * ice_is_non_eop - process handling of non-EOP buffers 26 * @rx_ring: Rx ring being processed 27 * @rx_desc: Rx descriptor for current buffer 28 * 29 * If the buffer is an EOP buffer, this function exits returning false, 30 * otherwise return true indicating that this is in fact a non-EOP buffer. 31 */ 32 static inline bool 33 ice_is_non_eop(const struct ice_rx_ring *rx_ring, 34 const union ice_32b_rx_flex_desc *rx_desc) 35 { 36 /* if we are the last buffer then there is nothing else to do */ 37 #define ICE_RXD_EOF BIT(ICE_RX_FLEX_DESC_STATUS0_EOF_S) 38 if (likely(ice_test_staterr(rx_desc->wb.status_error0, ICE_RXD_EOF))) 39 return false; 40 41 rx_ring->ring_stats->rx_stats.non_eop_descs++; 42 43 return true; 44 } 45 46 static inline __le64 47 ice_build_ctob(u64 td_cmd, u64 td_offset, unsigned int size, u64 td_tag) 48 { 49 return cpu_to_le64(ICE_TX_DESC_DTYPE_DATA | 50 (td_cmd << ICE_TXD_QW1_CMD_S) | 51 (td_offset << ICE_TXD_QW1_OFFSET_S) | 52 ((u64)size << ICE_TXD_QW1_TX_BUF_SZ_S) | 53 (td_tag << ICE_TXD_QW1_L2TAG1_S)); 54 } 55 56 /** 57 * ice_get_vlan_tci - get VLAN TCI from Rx flex descriptor 58 * @rx_desc: Rx 32b flex descriptor with RXDID=2 59 * 60 * The OS and current PF implementation only support stripping a single VLAN tag 61 * at a time, so there should only ever be 0 or 1 tags in the l2tag* fields. If 62 * one is found return the tag, else return 0 to mean no VLAN tag was found. 63 */ 64 static inline u16 65 ice_get_vlan_tci(const union ice_32b_rx_flex_desc *rx_desc) 66 { 67 u16 stat_err_bits; 68 69 stat_err_bits = BIT(ICE_RX_FLEX_DESC_STATUS0_L2TAG1P_S); 70 if (ice_test_staterr(rx_desc->wb.status_error0, stat_err_bits)) 71 return le16_to_cpu(rx_desc->wb.l2tag1); 72 73 stat_err_bits = BIT(ICE_RX_FLEX_DESC_STATUS1_L2TAG2P_S); 74 if (ice_test_staterr(rx_desc->wb.status_error1, stat_err_bits)) 75 return le16_to_cpu(rx_desc->wb.l2tag2_2nd); 76 77 return 0; 78 } 79 80 /** 81 * ice_xdp_ring_update_tail - Updates the XDP Tx ring tail register 82 * @xdp_ring: XDP Tx ring 83 * 84 * This function updates the XDP Tx ring tail register. 85 */ 86 static inline void ice_xdp_ring_update_tail(struct ice_tx_ring *xdp_ring) 87 { 88 /* Force memory writes to complete before letting h/w 89 * know there are new descriptors to fetch. 90 */ 91 wmb(); 92 writel_relaxed(xdp_ring->next_to_use, xdp_ring->tail); 93 } 94 95 /** 96 * ice_set_rs_bit - set RS bit on last produced descriptor (one behind current NTU) 97 * @xdp_ring: XDP ring to produce the HW Tx descriptors on 98 * 99 * returns index of descriptor that had RS bit produced on 100 */ 101 static inline u32 ice_set_rs_bit(const struct ice_tx_ring *xdp_ring) 102 { 103 u32 rs_idx = xdp_ring->next_to_use ? xdp_ring->next_to_use - 1 : xdp_ring->count - 1; 104 struct ice_tx_desc *tx_desc; 105 106 tx_desc = ICE_TX_DESC(xdp_ring, rs_idx); 107 tx_desc->cmd_type_offset_bsz |= 108 cpu_to_le64(ICE_TX_DESC_CMD_RS << ICE_TXD_QW1_CMD_S); 109 110 return rs_idx; 111 } 112 113 void ice_finalize_xdp_rx(struct ice_tx_ring *xdp_ring, unsigned int xdp_res, u32 first_idx); 114 int __ice_xmit_xdp_ring(struct xdp_buff *xdp, struct ice_tx_ring *xdp_ring, 115 bool frame); 116 void ice_release_rx_desc(struct ice_rx_ring *rx_ring, u16 val); 117 void 118 ice_process_skb_fields(struct ice_rx_ring *rx_ring, 119 union ice_32b_rx_flex_desc *rx_desc, 120 struct sk_buff *skb); 121 void 122 ice_receive_skb(struct ice_rx_ring *rx_ring, struct sk_buff *skb, u16 vlan_tci); 123 124 static inline void 125 ice_xdp_meta_set_desc(struct xdp_buff *xdp, 126 union ice_32b_rx_flex_desc *eop_desc) 127 { 128 struct ice_xdp_buff *xdp_ext = container_of(xdp, struct ice_xdp_buff, 129 xdp_buff); 130 131 xdp_ext->eop_desc = eop_desc; 132 } 133 #endif /* !_ICE_TXRX_LIB_H_ */ 134