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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ipoib_rx.c (2096B)

      1// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
      2/*
      3 * Copyright(c) 2020 Intel Corporation.
      4 *
      5 */
      6
      7#include "netdev.h"
      8#include "ipoib.h"
      9
     10#define HFI1_IPOIB_SKB_PAD ((NET_SKB_PAD) + (NET_IP_ALIGN))
     11
     12static void copy_ipoib_buf(struct sk_buff *skb, void *data, int size)
     13{
     14	void *dst_data;
     15
     16	skb_checksum_none_assert(skb);
     17	skb->protocol = *((__be16 *)data);
     18
     19	dst_data = skb_put(skb, size);
     20	memcpy(dst_data, data, size);
     21	skb->mac_header = HFI1_IPOIB_PSEUDO_LEN;
     22	skb_pull(skb, HFI1_IPOIB_ENCAP_LEN);
     23}
     24
     25static struct sk_buff *prepare_frag_skb(struct napi_struct *napi, int size)
     26{
     27	struct sk_buff *skb;
     28	int skb_size = SKB_DATA_ALIGN(size + HFI1_IPOIB_SKB_PAD);
     29	void *frag;
     30
     31	skb_size += SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
     32	skb_size = SKB_DATA_ALIGN(skb_size);
     33	frag = napi_alloc_frag(skb_size);
     34
     35	if (unlikely(!frag))
     36		return napi_alloc_skb(napi, size);
     37
     38	skb = build_skb(frag, skb_size);
     39
     40	if (unlikely(!skb)) {
     41		skb_free_frag(frag);
     42		return NULL;
     43	}
     44
     45	skb_reserve(skb, HFI1_IPOIB_SKB_PAD);
     46	return skb;
     47}
     48
     49struct sk_buff *hfi1_ipoib_prepare_skb(struct hfi1_netdev_rxq *rxq,
     50				       int size, void *data)
     51{
     52	struct napi_struct *napi = &rxq->napi;
     53	int skb_size = size + HFI1_IPOIB_ENCAP_LEN;
     54	struct sk_buff *skb;
     55
     56	/*
     57	 * For smaller(4k + skb overhead) allocations we will go using
     58	 * napi cache. Otherwise we will try to use napi frag cache.
     59	 */
     60	if (size <= SKB_WITH_OVERHEAD(PAGE_SIZE))
     61		skb = napi_alloc_skb(napi, skb_size);
     62	else
     63		skb = prepare_frag_skb(napi, skb_size);
     64
     65	if (unlikely(!skb))
     66		return NULL;
     67
     68	copy_ipoib_buf(skb, data, size);
     69
     70	return skb;
     71}
     72
     73int hfi1_ipoib_rxq_init(struct net_device *netdev)
     74{
     75	struct hfi1_ipoib_dev_priv *ipoib_priv = hfi1_ipoib_priv(netdev);
     76	struct hfi1_devdata *dd = ipoib_priv->dd;
     77	int ret;
     78
     79	ret = hfi1_netdev_rx_init(dd);
     80	if (ret)
     81		return ret;
     82
     83	hfi1_init_aip_rsm(dd);
     84
     85	return ret;
     86}
     87
     88void hfi1_ipoib_rxq_deinit(struct net_device *netdev)
     89{
     90	struct hfi1_ipoib_dev_priv *ipoib_priv = hfi1_ipoib_priv(netdev);
     91	struct hfi1_devdata *dd = ipoib_priv->dd;
     92
     93	hfi1_deinit_aip_rsm(dd);
     94	hfi1_netdev_rx_destroy(dd);
     95}