+/**
+ * t4vf_pktgl_to_skb - build an sk_buff from a packet gather list
+ * @gl: the gather list
+ * @skb_len: size of sk_buff main body if it carries fragments
+ * @pull_len: amount of data to move to the sk_buff's main body
+ *
+ * Builds an sk_buff from the given packet gather list. Returns the
+ * sk_buff or %NULL if sk_buff allocation failed.
+ */
+struct sk_buff *t4vf_pktgl_to_skb(const struct pkt_gl *gl,
+ unsigned int skb_len, unsigned int pull_len)
+{
+ struct sk_buff *skb;
+ struct skb_shared_info *ssi;
+
+ /*
+ * If the ingress packet is small enough, allocate an skb large enough
+ * for all of the data and copy it inline. Otherwise, allocate an skb
+ * with enough room to pull in the header and reference the rest of
+ * the data via the skb fragment list.
+ *
+ * Below we rely on RX_COPY_THRES being less than the smallest Rx
+ * buff! size, which is expected since buffers are at least
+ * PAGE_SIZEd. In this case packets up to RX_COPY_THRES have only one
+ * fragment.
+ */
+ if (gl->tot_len <= RX_COPY_THRES) {
+ /* small packets have only one fragment */
+ skb = alloc_skb(gl->tot_len, GFP_ATOMIC);
+ if (unlikely(!skb))
+ goto out;
+ __skb_put(skb, gl->tot_len);
+ skb_copy_to_linear_data(skb, gl->va, gl->tot_len);
+ } else {
+ skb = alloc_skb(skb_len, GFP_ATOMIC);
+ if (unlikely(!skb))
+ goto out;
+ __skb_put(skb, pull_len);
+ skb_copy_to_linear_data(skb, gl->va, pull_len);
+
+ ssi = skb_shinfo(skb);
+ ssi->frags[0].page = gl->frags[0].page;
+ ssi->frags[0].page_offset = gl->frags[0].page_offset + pull_len;
+ ssi->frags[0].size = gl->frags[0].size - pull_len;
+ if (gl->nfrags > 1)
+ memcpy(&ssi->frags[1], &gl->frags[1],
+ (gl->nfrags-1) * sizeof(skb_frag_t));
+ ssi->nr_frags = gl->nfrags;
+
+ skb->len = gl->tot_len;
+ skb->data_len = skb->len - pull_len;
+ skb->truesize += skb->data_len;
+
+ /* Get a reference for the last page, we don't own it */
+ get_page(gl->frags[gl->nfrags - 1].page);
+ }
+
+out:
+ return skb;
+}
+