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