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// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
/*
* Copyright(c) 2020 Intel Corporation.
*
*/
#include "netdev.h"
#include "ipoib.h"
#define HFI1_IPOIB_SKB_PAD ((NET_SKB_PAD) + (NET_IP_ALIGN))
static void copy_ipoib_buf(struct sk_buff *skb, void *data, int size)
{
void *dst_data;
skb_checksum_none_assert(skb);
skb->protocol = *((__be16 *)data);
dst_data = skb_put(skb, size);
memcpy(dst_data, data, size);
skb->mac_header = HFI1_IPOIB_PSEUDO_LEN;
skb_pull(skb, HFI1_IPOIB_ENCAP_LEN);
}
static struct sk_buff *prepare_frag_skb(struct napi_struct *napi, int size)
{
struct sk_buff *skb;
int skb_size = SKB_DATA_ALIGN(size + HFI1_IPOIB_SKB_PAD);
void *frag;
skb_size += SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
skb_size = SKB_DATA_ALIGN(skb_size);
frag = napi_alloc_frag(skb_size);
if (unlikely(!frag))
return napi_alloc_skb(napi, size);
skb = build_skb(frag, skb_size);
if (unlikely(!skb)) {
skb_free_frag(frag);
return NULL;
}
skb_reserve(skb, HFI1_IPOIB_SKB_PAD);
return skb;
}
struct sk_buff *hfi1_ipoib_prepare_skb(struct hfi1_netdev_rxq *rxq,
int size, void *data)
{
struct napi_struct *napi = &rxq->napi;
int skb_size = size + HFI1_IPOIB_ENCAP_LEN;
struct sk_buff *skb;
/*
* For smaller(4k + skb overhead) allocations we will go using
* napi cache. Otherwise we will try to use napi frag cache.
*/
if (size <= SKB_WITH_OVERHEAD(PAGE_SIZE))
skb = napi_alloc_skb(napi, skb_size);
else
skb = prepare_frag_skb(napi, skb_size);
if (unlikely(!skb))
return NULL;
copy_ipoib_buf(skb, data, size);
return skb;
}
int hfi1_ipoib_rxq_init(struct net_device *netdev)
{
struct hfi1_ipoib_dev_priv *ipoib_priv = hfi1_ipoib_priv(netdev);
struct hfi1_devdata *dd = ipoib_priv->dd;
int ret;
ret = hfi1_netdev_rx_init(dd);
if (ret)
return ret;
hfi1_init_aip_rsm(dd);
return ret;
}
void hfi1_ipoib_rxq_deinit(struct net_device *netdev)
{
struct hfi1_ipoib_dev_priv *ipoib_priv = hfi1_ipoib_priv(netdev);
struct hfi1_devdata *dd = ipoib_priv->dd;
hfi1_deinit_aip_rsm(dd);
hfi1_netdev_rx_destroy(dd);
}
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