cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ice_txrx_lib.h (2807B)

      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 */
     18static inline bool
     19ice_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
     24static inline __le64
     25ice_build_ctob(u64 td_cmd, u64 td_offset, unsigned int size, u64 td_tag)
     26{
     27	return cpu_to_le64(ICE_TX_DESC_DTYPE_DATA |
     28			   (td_cmd    << ICE_TXD_QW1_CMD_S) |
     29			   (td_offset << ICE_TXD_QW1_OFFSET_S) |
     30			   ((u64)size << ICE_TXD_QW1_TX_BUF_SZ_S) |
     31			   (td_tag    << ICE_TXD_QW1_L2TAG1_S));
     32}
     33
     34/**
     35 * ice_get_vlan_tag_from_rx_desc - get VLAN from Rx flex descriptor
     36 * @rx_desc: Rx 32b flex descriptor with RXDID=2
     37 *
     38 * The OS and current PF implementation only support stripping a single VLAN tag
     39 * at a time, so there should only ever be 0 or 1 tags in the l2tag* fields. If
     40 * one is found return the tag, else return 0 to mean no VLAN tag was found.
     41 */
     42static inline u16
     43ice_get_vlan_tag_from_rx_desc(union ice_32b_rx_flex_desc *rx_desc)
     44{
     45	u16 stat_err_bits;
     46
     47	stat_err_bits = BIT(ICE_RX_FLEX_DESC_STATUS0_L2TAG1P_S);
     48	if (ice_test_staterr(rx_desc->wb.status_error0, stat_err_bits))
     49		return le16_to_cpu(rx_desc->wb.l2tag1);
     50
     51	stat_err_bits = BIT(ICE_RX_FLEX_DESC_STATUS1_L2TAG2P_S);
     52	if (ice_test_staterr(rx_desc->wb.status_error1, stat_err_bits))
     53		return le16_to_cpu(rx_desc->wb.l2tag2_2nd);
     54
     55	return 0;
     56}
     57
     58/**
     59 * ice_xdp_ring_update_tail - Updates the XDP Tx ring tail register
     60 * @xdp_ring: XDP Tx ring
     61 *
     62 * This function updates the XDP Tx ring tail register.
     63 */
     64static inline void ice_xdp_ring_update_tail(struct ice_tx_ring *xdp_ring)
     65{
     66	/* Force memory writes to complete before letting h/w
     67	 * know there are new descriptors to fetch.
     68	 */
     69	wmb();
     70	writel_relaxed(xdp_ring->next_to_use, xdp_ring->tail);
     71}
     72
     73void ice_finalize_xdp_rx(struct ice_tx_ring *xdp_ring, unsigned int xdp_res);
     74int ice_xmit_xdp_buff(struct xdp_buff *xdp, struct ice_tx_ring *xdp_ring);
     75int ice_xmit_xdp_ring(void *data, u16 size, struct ice_tx_ring *xdp_ring);
     76void ice_release_rx_desc(struct ice_rx_ring *rx_ring, u16 val);
     77void
     78ice_process_skb_fields(struct ice_rx_ring *rx_ring,
     79		       union ice_32b_rx_flex_desc *rx_desc,
     80		       struct sk_buff *skb, u16 ptype);
     81void
     82ice_receive_skb(struct ice_rx_ring *rx_ring, struct sk_buff *skb, u16 vlan_tag);
     83#endif /* !_ICE_TXRX_LIB_H_ */