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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llc_nop.c (1850B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * nop (passthrough) Link Layer Control
      4 *
      5 * Copyright (C) 2012  Intel Corporation. All rights reserved.
      6 */
      7
      8#include <linux/types.h>
      9
     10#include "llc.h"
     11
     12struct llc_nop {
     13	struct nfc_hci_dev *hdev;
     14	xmit_to_drv_t xmit_to_drv;
     15	rcv_to_hci_t rcv_to_hci;
     16	int tx_headroom;
     17	int tx_tailroom;
     18	llc_failure_t llc_failure;
     19};
     20
     21static void *llc_nop_init(struct nfc_hci_dev *hdev, xmit_to_drv_t xmit_to_drv,
     22			  rcv_to_hci_t rcv_to_hci, int tx_headroom,
     23			  int tx_tailroom, int *rx_headroom, int *rx_tailroom,
     24			  llc_failure_t llc_failure)
     25{
     26	struct llc_nop *llc_nop;
     27
     28	*rx_headroom = 0;
     29	*rx_tailroom = 0;
     30
     31	llc_nop = kzalloc(sizeof(struct llc_nop), GFP_KERNEL);
     32	if (llc_nop == NULL)
     33		return NULL;
     34
     35	llc_nop->hdev = hdev;
     36	llc_nop->xmit_to_drv = xmit_to_drv;
     37	llc_nop->rcv_to_hci = rcv_to_hci;
     38	llc_nop->tx_headroom = tx_headroom;
     39	llc_nop->tx_tailroom = tx_tailroom;
     40	llc_nop->llc_failure = llc_failure;
     41
     42	return llc_nop;
     43}
     44
     45static void llc_nop_deinit(struct nfc_llc *llc)
     46{
     47	kfree(nfc_llc_get_data(llc));
     48}
     49
     50static int llc_nop_start(struct nfc_llc *llc)
     51{
     52	return 0;
     53}
     54
     55static int llc_nop_stop(struct nfc_llc *llc)
     56{
     57	return 0;
     58}
     59
     60static void llc_nop_rcv_from_drv(struct nfc_llc *llc, struct sk_buff *skb)
     61{
     62	struct llc_nop *llc_nop = nfc_llc_get_data(llc);
     63
     64	llc_nop->rcv_to_hci(llc_nop->hdev, skb);
     65}
     66
     67static int llc_nop_xmit_from_hci(struct nfc_llc *llc, struct sk_buff *skb)
     68{
     69	struct llc_nop *llc_nop = nfc_llc_get_data(llc);
     70
     71	return llc_nop->xmit_to_drv(llc_nop->hdev, skb);
     72}
     73
     74static const struct nfc_llc_ops llc_nop_ops = {
     75	.init = llc_nop_init,
     76	.deinit = llc_nop_deinit,
     77	.start = llc_nop_start,
     78	.stop = llc_nop_stop,
     79	.rcv_from_drv = llc_nop_rcv_from_drv,
     80	.xmit_from_hci = llc_nop_xmit_from_hci,
     81};
     82
     83int nfc_llc_nop_register(void)
     84{
     85	return nfc_llc_register(LLC_NOP_NAME, &llc_nop_ops);
     86}