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 skb_checksum_none_assert(skb);
15 skb->protocol = *((__be16 *)data);
16
17 skb_put_data(skb, data, len: size);
18 skb->mac_header = HFI1_IPOIB_PSEUDO_LEN;
19 skb_pull(skb, HFI1_IPOIB_ENCAP_LEN);
20}
21
22static struct sk_buff *prepare_frag_skb(struct napi_struct *napi, int size)
23{
24 struct sk_buff *skb;
25 int skb_size = SKB_DATA_ALIGN(size + HFI1_IPOIB_SKB_PAD);
26 void *frag;
27
28 skb_size += SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
29 skb_size = SKB_DATA_ALIGN(skb_size);
30 frag = napi_alloc_frag(fragsz: skb_size);
31
32 if (unlikely(!frag))
33 return napi_alloc_skb(napi, length: size);
34
35 skb = build_skb(data: frag, frag_size: skb_size);
36
37 if (unlikely(!skb)) {
38 skb_free_frag(addr: frag);
39 return NULL;
40 }
41
42 skb_reserve(skb, HFI1_IPOIB_SKB_PAD);
43 return skb;
44}
45
46struct sk_buff *hfi1_ipoib_prepare_skb(struct hfi1_netdev_rxq *rxq,
47 int size, void *data)
48{
49 struct napi_struct *napi = &rxq->napi;
50 int skb_size = size + HFI1_IPOIB_ENCAP_LEN;
51 struct sk_buff *skb;
52
53 /*
54 * For smaller(4k + skb overhead) allocations we will go using
55 * napi cache. Otherwise we will try to use napi frag cache.
56 */
57 if (size <= SKB_WITH_OVERHEAD(PAGE_SIZE))
58 skb = napi_alloc_skb(napi, length: skb_size);
59 else
60 skb = prepare_frag_skb(napi, size: skb_size);
61
62 if (unlikely(!skb))
63 return NULL;
64
65 copy_ipoib_buf(skb, data, size);
66
67 return skb;
68}
69
70int hfi1_ipoib_rxq_init(struct net_device *netdev)
71{
72 struct hfi1_ipoib_dev_priv *ipoib_priv = hfi1_ipoib_priv(dev: netdev);
73 struct hfi1_devdata *dd = ipoib_priv->dd;
74 int ret;
75
76 ret = hfi1_netdev_rx_init(dd);
77 if (ret)
78 return ret;
79
80 hfi1_init_aip_rsm(dd);
81
82 return ret;
83}
84
85void hfi1_ipoib_rxq_deinit(struct net_device *netdev)
86{
87 struct hfi1_ipoib_dev_priv *ipoib_priv = hfi1_ipoib_priv(dev: netdev);
88 struct hfi1_devdata *dd = ipoib_priv->dd;
89
90 hfi1_deinit_aip_rsm(dd);
91 hfi1_netdev_rx_destroy(dd);
92}
93

source code of linux/drivers/infiniband/hw/hfi1/ipoib_rx.c