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net/funeth: Unify skb/XDP packet mapping.
Instead of passing an skb to the mapping function pass an skb_shared_info plus an additional address/length pair. This makes it usable for both skbs and XDP. Call it from the XDP path and adjust the skb path. Signed-off-by: Dimitris Michailidis <dmichail@fungible.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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parent
a3b461bbd1
commit
1c45b0cd6c
1 changed files with 17 additions and 15 deletions
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@ -16,23 +16,24 @@
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#define FUN_XDP_CLEAN_BATCH 16
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/* DMA-map a packet and return the (length, DMA_address) pairs for its
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* segments. If a mapping error occurs -ENOMEM is returned.
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* segments. If a mapping error occurs -ENOMEM is returned. The packet
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* consists of an skb_shared_info and one additional address/length pair.
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*/
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static int map_skb(const struct sk_buff *skb, struct device *dev,
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dma_addr_t *addr, unsigned int *len)
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static int fun_map_pkt(struct device *dev, const struct skb_shared_info *si,
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void *data, unsigned int data_len,
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dma_addr_t *addr, unsigned int *len)
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{
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const struct skb_shared_info *si;
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const skb_frag_t *fp, *end;
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*len = skb_headlen(skb);
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*addr = dma_map_single(dev, skb->data, *len, DMA_TO_DEVICE);
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*len = data_len;
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*addr = dma_map_single(dev, data, *len, DMA_TO_DEVICE);
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if (dma_mapping_error(dev, *addr))
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return -ENOMEM;
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si = skb_shinfo(skb);
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end = &si->frags[si->nr_frags];
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if (!si)
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return 0;
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for (fp = si->frags; fp < end; fp++) {
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for (fp = si->frags, end = fp + si->nr_frags; fp < end; fp++) {
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*++len = skb_frag_size(fp);
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*++addr = skb_frag_dma_map(dev, fp, 0, *len, DMA_TO_DEVICE);
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if (dma_mapping_error(dev, *addr))
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@ -44,7 +45,7 @@ static int map_skb(const struct sk_buff *skb, struct device *dev,
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while (fp-- > si->frags)
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dma_unmap_page(dev, *--addr, skb_frag_size(fp), DMA_TO_DEVICE);
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dma_unmap_single(dev, addr[-1], skb_headlen(skb), DMA_TO_DEVICE);
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dma_unmap_single(dev, addr[-1], data_len, DMA_TO_DEVICE);
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return -ENOMEM;
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}
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@ -160,7 +161,9 @@ static unsigned int write_pkt_desc(struct sk_buff *skb, struct funeth_txq *q,
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unsigned int ngle;
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u16 flags;
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if (unlikely(map_skb(skb, q->dma_dev, addrs, lens))) {
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shinfo = skb_shinfo(skb);
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if (unlikely(fun_map_pkt(q->dma_dev, shinfo, skb->data,
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skb_headlen(skb), addrs, lens))) {
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FUN_QSTAT_INC(q, tx_map_err);
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return 0;
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}
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@ -173,7 +176,6 @@ static unsigned int write_pkt_desc(struct sk_buff *skb, struct funeth_txq *q,
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req->repr_idn = 0;
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req->encap_proto = 0;
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shinfo = skb_shinfo(skb);
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if (likely(shinfo->gso_size)) {
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if (skb->encapsulation) {
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u16 ol4_ofst;
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@ -512,6 +514,7 @@ static unsigned int fun_xdpq_clean(struct funeth_txq *q, unsigned int budget)
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bool fun_xdp_tx(struct funeth_txq *q, struct xdp_frame *xdpf)
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{
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const struct skb_shared_info *si = NULL;
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struct fun_eth_tx_req *req;
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unsigned int idx, len;
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dma_addr_t dma;
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@ -524,9 +527,8 @@ bool fun_xdp_tx(struct funeth_txq *q, struct xdp_frame *xdpf)
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return false;
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}
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len = xdpf->len;
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dma = dma_map_single(q->dma_dev, xdpf->data, len, DMA_TO_DEVICE);
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if (unlikely(dma_mapping_error(q->dma_dev, dma))) {
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if (unlikely(fun_map_pkt(q->dma_dev, si, xdpf->data, xdpf->len, &dma,
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&len))) {
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FUN_QSTAT_INC(q, tx_map_err);
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return false;
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}
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