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
copy_ipoib_buf(struct sk_buff * skb,void * data,int size)12 static 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, size);
18 skb->mac_header = HFI1_IPOIB_PSEUDO_LEN;
19 skb_pull(skb, HFI1_IPOIB_ENCAP_LEN);
20 }
21
prepare_frag_skb(struct napi_struct * napi,int size)22 static 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(skb_size);
31
32 if (unlikely(!frag))
33 return napi_alloc_skb(napi, size);
34
35 skb = build_skb(frag, skb_size);
36
37 if (unlikely(!skb)) {
38 skb_free_frag(frag);
39 return NULL;
40 }
41
42 skb_reserve(skb, HFI1_IPOIB_SKB_PAD);
43 return skb;
44 }
45
hfi1_ipoib_prepare_skb(struct hfi1_netdev_rxq * rxq,int size,void * data)46 struct 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, skb_size);
59 else
60 skb = prepare_frag_skb(napi, skb_size);
61
62 if (unlikely(!skb))
63 return NULL;
64
65 copy_ipoib_buf(skb, data, size);
66
67 return skb;
68 }
69
hfi1_ipoib_rxq_init(struct net_device * netdev)70 int hfi1_ipoib_rxq_init(struct net_device *netdev)
71 {
72 struct hfi1_ipoib_dev_priv *ipoib_priv = hfi1_ipoib_priv(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
hfi1_ipoib_rxq_deinit(struct net_device * netdev)85 void hfi1_ipoib_rxq_deinit(struct net_device *netdev)
86 {
87 struct hfi1_ipoib_dev_priv *ipoib_priv = hfi1_ipoib_priv(netdev);
88 struct hfi1_devdata *dd = ipoib_priv->dd;
89
90 hfi1_deinit_aip_rsm(dd);
91 hfi1_netdev_rx_destroy(dd);
92 }
93