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0fe79f28bf
Allow the gro_max_size to exceed a value larger than 65536. There weren't really any external limitations that prevented this other than the fact that IPv4 only supports a 16 bit length field. Since we have the option of adding a hop-by-hop header for IPv6 we can allow IPv6 to exceed this value and for IPv4 and non-TCP flows we can cap things at 65536 via a constant rather than relying on gro_max_size. [edumazet] limit GRO_MAX_SIZE to (8 * 65535) to avoid overflows. Signed-off-by: Alexander Duyck <alexanderduyck@fb.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
796 lines
20 KiB
C
796 lines
20 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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#include <net/gro.h>
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#include <net/dst_metadata.h>
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#include <net/busy_poll.h>
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#include <trace/events/net.h>
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#define MAX_GRO_SKBS 8
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/* This should be increased if a protocol with a bigger head is added. */
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#define GRO_MAX_HEAD (MAX_HEADER + 128)
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static DEFINE_SPINLOCK(offload_lock);
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static struct list_head offload_base __read_mostly = LIST_HEAD_INIT(offload_base);
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/* Maximum number of GRO_NORMAL skbs to batch up for list-RX */
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int gro_normal_batch __read_mostly = 8;
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/**
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* dev_add_offload - register offload handlers
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* @po: protocol offload declaration
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*
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* Add protocol offload handlers to the networking stack. The passed
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* &proto_offload is linked into kernel lists and may not be freed until
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* it has been removed from the kernel lists.
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*
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* This call does not sleep therefore it can not
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* guarantee all CPU's that are in middle of receiving packets
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* will see the new offload handlers (until the next received packet).
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*/
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void dev_add_offload(struct packet_offload *po)
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{
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struct packet_offload *elem;
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spin_lock(&offload_lock);
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list_for_each_entry(elem, &offload_base, list) {
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if (po->priority < elem->priority)
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break;
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}
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list_add_rcu(&po->list, elem->list.prev);
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spin_unlock(&offload_lock);
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}
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EXPORT_SYMBOL(dev_add_offload);
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/**
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* __dev_remove_offload - remove offload handler
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* @po: packet offload declaration
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*
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* Remove a protocol offload handler that was previously added to the
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* kernel offload handlers by dev_add_offload(). The passed &offload_type
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* is removed from the kernel lists and can be freed or reused once this
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* function returns.
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*
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* The packet type might still be in use by receivers
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* and must not be freed until after all the CPU's have gone
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* through a quiescent state.
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*/
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static void __dev_remove_offload(struct packet_offload *po)
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{
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struct list_head *head = &offload_base;
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struct packet_offload *po1;
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spin_lock(&offload_lock);
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list_for_each_entry(po1, head, list) {
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if (po == po1) {
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list_del_rcu(&po->list);
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goto out;
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}
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}
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pr_warn("dev_remove_offload: %p not found\n", po);
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out:
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spin_unlock(&offload_lock);
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}
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/**
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* dev_remove_offload - remove packet offload handler
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* @po: packet offload declaration
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*
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* Remove a packet offload handler that was previously added to the kernel
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* offload handlers by dev_add_offload(). The passed &offload_type is
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* removed from the kernel lists and can be freed or reused once this
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* function returns.
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*
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* This call sleeps to guarantee that no CPU is looking at the packet
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* type after return.
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*/
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void dev_remove_offload(struct packet_offload *po)
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{
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__dev_remove_offload(po);
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synchronize_net();
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}
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EXPORT_SYMBOL(dev_remove_offload);
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/**
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* skb_eth_gso_segment - segmentation handler for ethernet protocols.
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* @skb: buffer to segment
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* @features: features for the output path (see dev->features)
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* @type: Ethernet Protocol ID
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*/
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struct sk_buff *skb_eth_gso_segment(struct sk_buff *skb,
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netdev_features_t features, __be16 type)
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{
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struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
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struct packet_offload *ptype;
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rcu_read_lock();
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list_for_each_entry_rcu(ptype, &offload_base, list) {
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if (ptype->type == type && ptype->callbacks.gso_segment) {
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segs = ptype->callbacks.gso_segment(skb, features);
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break;
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}
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}
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rcu_read_unlock();
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return segs;
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}
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EXPORT_SYMBOL(skb_eth_gso_segment);
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/**
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* skb_mac_gso_segment - mac layer segmentation handler.
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* @skb: buffer to segment
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* @features: features for the output path (see dev->features)
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*/
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struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
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netdev_features_t features)
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{
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struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
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struct packet_offload *ptype;
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int vlan_depth = skb->mac_len;
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__be16 type = skb_network_protocol(skb, &vlan_depth);
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if (unlikely(!type))
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return ERR_PTR(-EINVAL);
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__skb_pull(skb, vlan_depth);
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rcu_read_lock();
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list_for_each_entry_rcu(ptype, &offload_base, list) {
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if (ptype->type == type && ptype->callbacks.gso_segment) {
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segs = ptype->callbacks.gso_segment(skb, features);
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break;
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}
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}
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rcu_read_unlock();
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__skb_push(skb, skb->data - skb_mac_header(skb));
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return segs;
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}
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EXPORT_SYMBOL(skb_mac_gso_segment);
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int skb_gro_receive(struct sk_buff *p, struct sk_buff *skb)
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{
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struct skb_shared_info *pinfo, *skbinfo = skb_shinfo(skb);
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unsigned int offset = skb_gro_offset(skb);
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unsigned int headlen = skb_headlen(skb);
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unsigned int len = skb_gro_len(skb);
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unsigned int delta_truesize;
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unsigned int gro_max_size;
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unsigned int new_truesize;
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struct sk_buff *lp;
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/* pairs with WRITE_ONCE() in netif_set_gro_max_size() */
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gro_max_size = READ_ONCE(p->dev->gro_max_size);
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if (unlikely(p->len + len >= gro_max_size || NAPI_GRO_CB(skb)->flush))
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return -E2BIG;
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if (unlikely(p->len + len >= GRO_LEGACY_MAX_SIZE)) {
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if (p->protocol != htons(ETH_P_IPV6) ||
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skb_headroom(p) < sizeof(struct hop_jumbo_hdr) ||
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ipv6_hdr(p)->nexthdr != IPPROTO_TCP ||
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p->encapsulation)
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return -E2BIG;
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}
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lp = NAPI_GRO_CB(p)->last;
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pinfo = skb_shinfo(lp);
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if (headlen <= offset) {
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skb_frag_t *frag;
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skb_frag_t *frag2;
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int i = skbinfo->nr_frags;
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int nr_frags = pinfo->nr_frags + i;
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if (nr_frags > MAX_SKB_FRAGS)
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goto merge;
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offset -= headlen;
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pinfo->nr_frags = nr_frags;
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skbinfo->nr_frags = 0;
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frag = pinfo->frags + nr_frags;
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frag2 = skbinfo->frags + i;
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do {
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*--frag = *--frag2;
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} while (--i);
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skb_frag_off_add(frag, offset);
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skb_frag_size_sub(frag, offset);
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/* all fragments truesize : remove (head size + sk_buff) */
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new_truesize = SKB_TRUESIZE(skb_end_offset(skb));
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delta_truesize = skb->truesize - new_truesize;
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skb->truesize = new_truesize;
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skb->len -= skb->data_len;
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skb->data_len = 0;
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NAPI_GRO_CB(skb)->free = NAPI_GRO_FREE;
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goto done;
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} else if (skb->head_frag) {
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int nr_frags = pinfo->nr_frags;
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skb_frag_t *frag = pinfo->frags + nr_frags;
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struct page *page = virt_to_head_page(skb->head);
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unsigned int first_size = headlen - offset;
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unsigned int first_offset;
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if (nr_frags + 1 + skbinfo->nr_frags > MAX_SKB_FRAGS)
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goto merge;
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first_offset = skb->data -
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(unsigned char *)page_address(page) +
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offset;
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pinfo->nr_frags = nr_frags + 1 + skbinfo->nr_frags;
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__skb_frag_set_page(frag, page);
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skb_frag_off_set(frag, first_offset);
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skb_frag_size_set(frag, first_size);
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memcpy(frag + 1, skbinfo->frags, sizeof(*frag) * skbinfo->nr_frags);
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/* We dont need to clear skbinfo->nr_frags here */
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new_truesize = SKB_DATA_ALIGN(sizeof(struct sk_buff));
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delta_truesize = skb->truesize - new_truesize;
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skb->truesize = new_truesize;
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NAPI_GRO_CB(skb)->free = NAPI_GRO_FREE_STOLEN_HEAD;
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goto done;
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}
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merge:
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/* sk owenrship - if any - completely transferred to the aggregated packet */
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skb->destructor = NULL;
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delta_truesize = skb->truesize;
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if (offset > headlen) {
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unsigned int eat = offset - headlen;
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skb_frag_off_add(&skbinfo->frags[0], eat);
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skb_frag_size_sub(&skbinfo->frags[0], eat);
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skb->data_len -= eat;
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skb->len -= eat;
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offset = headlen;
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}
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__skb_pull(skb, offset);
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if (NAPI_GRO_CB(p)->last == p)
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skb_shinfo(p)->frag_list = skb;
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else
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NAPI_GRO_CB(p)->last->next = skb;
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NAPI_GRO_CB(p)->last = skb;
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__skb_header_release(skb);
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lp = p;
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done:
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NAPI_GRO_CB(p)->count++;
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p->data_len += len;
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p->truesize += delta_truesize;
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p->len += len;
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if (lp != p) {
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lp->data_len += len;
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lp->truesize += delta_truesize;
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lp->len += len;
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}
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NAPI_GRO_CB(skb)->same_flow = 1;
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return 0;
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}
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static void napi_gro_complete(struct napi_struct *napi, struct sk_buff *skb)
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{
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struct packet_offload *ptype;
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__be16 type = skb->protocol;
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struct list_head *head = &offload_base;
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int err = -ENOENT;
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BUILD_BUG_ON(sizeof(struct napi_gro_cb) > sizeof(skb->cb));
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if (NAPI_GRO_CB(skb)->count == 1) {
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skb_shinfo(skb)->gso_size = 0;
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goto out;
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}
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rcu_read_lock();
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list_for_each_entry_rcu(ptype, head, list) {
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if (ptype->type != type || !ptype->callbacks.gro_complete)
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continue;
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err = INDIRECT_CALL_INET(ptype->callbacks.gro_complete,
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ipv6_gro_complete, inet_gro_complete,
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skb, 0);
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break;
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}
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rcu_read_unlock();
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if (err) {
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WARN_ON(&ptype->list == head);
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kfree_skb(skb);
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return;
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}
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out:
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gro_normal_one(napi, skb, NAPI_GRO_CB(skb)->count);
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}
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static void __napi_gro_flush_chain(struct napi_struct *napi, u32 index,
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bool flush_old)
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{
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struct list_head *head = &napi->gro_hash[index].list;
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struct sk_buff *skb, *p;
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list_for_each_entry_safe_reverse(skb, p, head, list) {
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if (flush_old && NAPI_GRO_CB(skb)->age == jiffies)
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return;
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skb_list_del_init(skb);
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napi_gro_complete(napi, skb);
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napi->gro_hash[index].count--;
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}
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if (!napi->gro_hash[index].count)
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__clear_bit(index, &napi->gro_bitmask);
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}
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/* napi->gro_hash[].list contains packets ordered by age.
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* youngest packets at the head of it.
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* Complete skbs in reverse order to reduce latencies.
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*/
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void napi_gro_flush(struct napi_struct *napi, bool flush_old)
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{
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unsigned long bitmask = napi->gro_bitmask;
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unsigned int i, base = ~0U;
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while ((i = ffs(bitmask)) != 0) {
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bitmask >>= i;
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base += i;
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__napi_gro_flush_chain(napi, base, flush_old);
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}
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}
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EXPORT_SYMBOL(napi_gro_flush);
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static void gro_list_prepare(const struct list_head *head,
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const struct sk_buff *skb)
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{
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unsigned int maclen = skb->dev->hard_header_len;
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u32 hash = skb_get_hash_raw(skb);
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struct sk_buff *p;
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list_for_each_entry(p, head, list) {
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unsigned long diffs;
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NAPI_GRO_CB(p)->flush = 0;
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if (hash != skb_get_hash_raw(p)) {
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NAPI_GRO_CB(p)->same_flow = 0;
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continue;
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}
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diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
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diffs |= skb_vlan_tag_present(p) ^ skb_vlan_tag_present(skb);
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if (skb_vlan_tag_present(p))
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diffs |= skb_vlan_tag_get(p) ^ skb_vlan_tag_get(skb);
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diffs |= skb_metadata_differs(p, skb);
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if (maclen == ETH_HLEN)
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diffs |= compare_ether_header(skb_mac_header(p),
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skb_mac_header(skb));
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else if (!diffs)
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diffs = memcmp(skb_mac_header(p),
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skb_mac_header(skb),
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maclen);
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/* in most common scenarions 'slow_gro' is 0
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* otherwise we are already on some slower paths
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* either skip all the infrequent tests altogether or
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* avoid trying too hard to skip each of them individually
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*/
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if (!diffs && unlikely(skb->slow_gro | p->slow_gro)) {
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#if IS_ENABLED(CONFIG_SKB_EXTENSIONS) && IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
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struct tc_skb_ext *skb_ext;
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struct tc_skb_ext *p_ext;
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#endif
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diffs |= p->sk != skb->sk;
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diffs |= skb_metadata_dst_cmp(p, skb);
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diffs |= skb_get_nfct(p) ^ skb_get_nfct(skb);
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#if IS_ENABLED(CONFIG_SKB_EXTENSIONS) && IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
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skb_ext = skb_ext_find(skb, TC_SKB_EXT);
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p_ext = skb_ext_find(p, TC_SKB_EXT);
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diffs |= (!!p_ext) ^ (!!skb_ext);
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if (!diffs && unlikely(skb_ext))
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diffs |= p_ext->chain ^ skb_ext->chain;
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#endif
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}
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NAPI_GRO_CB(p)->same_flow = !diffs;
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}
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}
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static inline void skb_gro_reset_offset(struct sk_buff *skb, u32 nhoff)
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{
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const struct skb_shared_info *pinfo = skb_shinfo(skb);
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const skb_frag_t *frag0 = &pinfo->frags[0];
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NAPI_GRO_CB(skb)->data_offset = 0;
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NAPI_GRO_CB(skb)->frag0 = NULL;
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NAPI_GRO_CB(skb)->frag0_len = 0;
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if (!skb_headlen(skb) && pinfo->nr_frags &&
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!PageHighMem(skb_frag_page(frag0)) &&
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(!NET_IP_ALIGN || !((skb_frag_off(frag0) + nhoff) & 3))) {
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NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0);
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NAPI_GRO_CB(skb)->frag0_len = min_t(unsigned int,
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skb_frag_size(frag0),
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skb->end - skb->tail);
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}
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}
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static void gro_pull_from_frag0(struct sk_buff *skb, int grow)
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{
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struct skb_shared_info *pinfo = skb_shinfo(skb);
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BUG_ON(skb->end - skb->tail < grow);
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memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
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skb->data_len -= grow;
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skb->tail += grow;
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skb_frag_off_add(&pinfo->frags[0], grow);
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skb_frag_size_sub(&pinfo->frags[0], grow);
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if (unlikely(!skb_frag_size(&pinfo->frags[0]))) {
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skb_frag_unref(skb, 0);
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memmove(pinfo->frags, pinfo->frags + 1,
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--pinfo->nr_frags * sizeof(pinfo->frags[0]));
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}
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}
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static void gro_flush_oldest(struct napi_struct *napi, struct list_head *head)
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{
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struct sk_buff *oldest;
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oldest = list_last_entry(head, struct sk_buff, list);
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/* We are called with head length >= MAX_GRO_SKBS, so this is
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* impossible.
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*/
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if (WARN_ON_ONCE(!oldest))
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return;
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/* Do not adjust napi->gro_hash[].count, caller is adding a new
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* SKB to the chain.
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*/
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skb_list_del_init(oldest);
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napi_gro_complete(napi, oldest);
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}
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static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
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{
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u32 bucket = skb_get_hash_raw(skb) & (GRO_HASH_BUCKETS - 1);
|
|
struct gro_list *gro_list = &napi->gro_hash[bucket];
|
|
struct list_head *head = &offload_base;
|
|
struct packet_offload *ptype;
|
|
__be16 type = skb->protocol;
|
|
struct sk_buff *pp = NULL;
|
|
enum gro_result ret;
|
|
int same_flow;
|
|
int grow;
|
|
|
|
if (netif_elide_gro(skb->dev))
|
|
goto normal;
|
|
|
|
gro_list_prepare(&gro_list->list, skb);
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(ptype, head, list) {
|
|
if (ptype->type != type || !ptype->callbacks.gro_receive)
|
|
continue;
|
|
|
|
skb_set_network_header(skb, skb_gro_offset(skb));
|
|
skb_reset_mac_len(skb);
|
|
BUILD_BUG_ON(sizeof_field(struct napi_gro_cb, zeroed) != sizeof(u32));
|
|
BUILD_BUG_ON(!IS_ALIGNED(offsetof(struct napi_gro_cb, zeroed),
|
|
sizeof(u32))); /* Avoid slow unaligned acc */
|
|
*(u32 *)&NAPI_GRO_CB(skb)->zeroed = 0;
|
|
NAPI_GRO_CB(skb)->flush = skb_is_gso(skb) || skb_has_frag_list(skb);
|
|
NAPI_GRO_CB(skb)->is_atomic = 1;
|
|
|
|
/* Setup for GRO checksum validation */
|
|
switch (skb->ip_summed) {
|
|
case CHECKSUM_COMPLETE:
|
|
NAPI_GRO_CB(skb)->csum = skb->csum;
|
|
NAPI_GRO_CB(skb)->csum_valid = 1;
|
|
break;
|
|
case CHECKSUM_UNNECESSARY:
|
|
NAPI_GRO_CB(skb)->csum_cnt = skb->csum_level + 1;
|
|
break;
|
|
}
|
|
|
|
pp = INDIRECT_CALL_INET(ptype->callbacks.gro_receive,
|
|
ipv6_gro_receive, inet_gro_receive,
|
|
&gro_list->list, skb);
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (&ptype->list == head)
|
|
goto normal;
|
|
|
|
if (PTR_ERR(pp) == -EINPROGRESS) {
|
|
ret = GRO_CONSUMED;
|
|
goto ok;
|
|
}
|
|
|
|
same_flow = NAPI_GRO_CB(skb)->same_flow;
|
|
ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
|
|
|
|
if (pp) {
|
|
skb_list_del_init(pp);
|
|
napi_gro_complete(napi, pp);
|
|
gro_list->count--;
|
|
}
|
|
|
|
if (same_flow)
|
|
goto ok;
|
|
|
|
if (NAPI_GRO_CB(skb)->flush)
|
|
goto normal;
|
|
|
|
if (unlikely(gro_list->count >= MAX_GRO_SKBS))
|
|
gro_flush_oldest(napi, &gro_list->list);
|
|
else
|
|
gro_list->count++;
|
|
|
|
NAPI_GRO_CB(skb)->count = 1;
|
|
NAPI_GRO_CB(skb)->age = jiffies;
|
|
NAPI_GRO_CB(skb)->last = skb;
|
|
skb_shinfo(skb)->gso_size = skb_gro_len(skb);
|
|
list_add(&skb->list, &gro_list->list);
|
|
ret = GRO_HELD;
|
|
|
|
pull:
|
|
grow = skb_gro_offset(skb) - skb_headlen(skb);
|
|
if (grow > 0)
|
|
gro_pull_from_frag0(skb, grow);
|
|
ok:
|
|
if (gro_list->count) {
|
|
if (!test_bit(bucket, &napi->gro_bitmask))
|
|
__set_bit(bucket, &napi->gro_bitmask);
|
|
} else if (test_bit(bucket, &napi->gro_bitmask)) {
|
|
__clear_bit(bucket, &napi->gro_bitmask);
|
|
}
|
|
|
|
return ret;
|
|
|
|
normal:
|
|
ret = GRO_NORMAL;
|
|
goto pull;
|
|
}
|
|
|
|
struct packet_offload *gro_find_receive_by_type(__be16 type)
|
|
{
|
|
struct list_head *offload_head = &offload_base;
|
|
struct packet_offload *ptype;
|
|
|
|
list_for_each_entry_rcu(ptype, offload_head, list) {
|
|
if (ptype->type != type || !ptype->callbacks.gro_receive)
|
|
continue;
|
|
return ptype;
|
|
}
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(gro_find_receive_by_type);
|
|
|
|
struct packet_offload *gro_find_complete_by_type(__be16 type)
|
|
{
|
|
struct list_head *offload_head = &offload_base;
|
|
struct packet_offload *ptype;
|
|
|
|
list_for_each_entry_rcu(ptype, offload_head, list) {
|
|
if (ptype->type != type || !ptype->callbacks.gro_complete)
|
|
continue;
|
|
return ptype;
|
|
}
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(gro_find_complete_by_type);
|
|
|
|
static gro_result_t napi_skb_finish(struct napi_struct *napi,
|
|
struct sk_buff *skb,
|
|
gro_result_t ret)
|
|
{
|
|
switch (ret) {
|
|
case GRO_NORMAL:
|
|
gro_normal_one(napi, skb, 1);
|
|
break;
|
|
|
|
case GRO_MERGED_FREE:
|
|
if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD)
|
|
napi_skb_free_stolen_head(skb);
|
|
else if (skb->fclone != SKB_FCLONE_UNAVAILABLE)
|
|
__kfree_skb(skb);
|
|
else
|
|
__kfree_skb_defer(skb);
|
|
break;
|
|
|
|
case GRO_HELD:
|
|
case GRO_MERGED:
|
|
case GRO_CONSUMED:
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
|
|
{
|
|
gro_result_t ret;
|
|
|
|
skb_mark_napi_id(skb, napi);
|
|
trace_napi_gro_receive_entry(skb);
|
|
|
|
skb_gro_reset_offset(skb, 0);
|
|
|
|
ret = napi_skb_finish(napi, skb, dev_gro_receive(napi, skb));
|
|
trace_napi_gro_receive_exit(ret);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(napi_gro_receive);
|
|
|
|
static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
|
|
{
|
|
if (unlikely(skb->pfmemalloc)) {
|
|
consume_skb(skb);
|
|
return;
|
|
}
|
|
__skb_pull(skb, skb_headlen(skb));
|
|
/* restore the reserve we had after netdev_alloc_skb_ip_align() */
|
|
skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb));
|
|
__vlan_hwaccel_clear_tag(skb);
|
|
skb->dev = napi->dev;
|
|
skb->skb_iif = 0;
|
|
|
|
/* eth_type_trans() assumes pkt_type is PACKET_HOST */
|
|
skb->pkt_type = PACKET_HOST;
|
|
|
|
skb->encapsulation = 0;
|
|
skb_shinfo(skb)->gso_type = 0;
|
|
if (unlikely(skb->slow_gro)) {
|
|
skb_orphan(skb);
|
|
skb_ext_reset(skb);
|
|
nf_reset_ct(skb);
|
|
skb->slow_gro = 0;
|
|
}
|
|
|
|
napi->skb = skb;
|
|
}
|
|
|
|
struct sk_buff *napi_get_frags(struct napi_struct *napi)
|
|
{
|
|
struct sk_buff *skb = napi->skb;
|
|
|
|
if (!skb) {
|
|
skb = napi_alloc_skb(napi, GRO_MAX_HEAD);
|
|
if (skb) {
|
|
napi->skb = skb;
|
|
skb_mark_napi_id(skb, napi);
|
|
}
|
|
}
|
|
return skb;
|
|
}
|
|
EXPORT_SYMBOL(napi_get_frags);
|
|
|
|
static gro_result_t napi_frags_finish(struct napi_struct *napi,
|
|
struct sk_buff *skb,
|
|
gro_result_t ret)
|
|
{
|
|
switch (ret) {
|
|
case GRO_NORMAL:
|
|
case GRO_HELD:
|
|
__skb_push(skb, ETH_HLEN);
|
|
skb->protocol = eth_type_trans(skb, skb->dev);
|
|
if (ret == GRO_NORMAL)
|
|
gro_normal_one(napi, skb, 1);
|
|
break;
|
|
|
|
case GRO_MERGED_FREE:
|
|
if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD)
|
|
napi_skb_free_stolen_head(skb);
|
|
else
|
|
napi_reuse_skb(napi, skb);
|
|
break;
|
|
|
|
case GRO_MERGED:
|
|
case GRO_CONSUMED:
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Upper GRO stack assumes network header starts at gro_offset=0
|
|
* Drivers could call both napi_gro_frags() and napi_gro_receive()
|
|
* We copy ethernet header into skb->data to have a common layout.
|
|
*/
|
|
static struct sk_buff *napi_frags_skb(struct napi_struct *napi)
|
|
{
|
|
struct sk_buff *skb = napi->skb;
|
|
const struct ethhdr *eth;
|
|
unsigned int hlen = sizeof(*eth);
|
|
|
|
napi->skb = NULL;
|
|
|
|
skb_reset_mac_header(skb);
|
|
skb_gro_reset_offset(skb, hlen);
|
|
|
|
if (unlikely(skb_gro_header_hard(skb, hlen))) {
|
|
eth = skb_gro_header_slow(skb, hlen, 0);
|
|
if (unlikely(!eth)) {
|
|
net_warn_ratelimited("%s: dropping impossible skb from %s\n",
|
|
__func__, napi->dev->name);
|
|
napi_reuse_skb(napi, skb);
|
|
return NULL;
|
|
}
|
|
} else {
|
|
eth = (const struct ethhdr *)skb->data;
|
|
gro_pull_from_frag0(skb, hlen);
|
|
NAPI_GRO_CB(skb)->frag0 += hlen;
|
|
NAPI_GRO_CB(skb)->frag0_len -= hlen;
|
|
}
|
|
__skb_pull(skb, hlen);
|
|
|
|
/*
|
|
* This works because the only protocols we care about don't require
|
|
* special handling.
|
|
* We'll fix it up properly in napi_frags_finish()
|
|
*/
|
|
skb->protocol = eth->h_proto;
|
|
|
|
return skb;
|
|
}
|
|
|
|
gro_result_t napi_gro_frags(struct napi_struct *napi)
|
|
{
|
|
gro_result_t ret;
|
|
struct sk_buff *skb = napi_frags_skb(napi);
|
|
|
|
trace_napi_gro_frags_entry(skb);
|
|
|
|
ret = napi_frags_finish(napi, skb, dev_gro_receive(napi, skb));
|
|
trace_napi_gro_frags_exit(ret);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(napi_gro_frags);
|
|
|
|
/* Compute the checksum from gro_offset and return the folded value
|
|
* after adding in any pseudo checksum.
|
|
*/
|
|
__sum16 __skb_gro_checksum_complete(struct sk_buff *skb)
|
|
{
|
|
__wsum wsum;
|
|
__sum16 sum;
|
|
|
|
wsum = skb_checksum(skb, skb_gro_offset(skb), skb_gro_len(skb), 0);
|
|
|
|
/* NAPI_GRO_CB(skb)->csum holds pseudo checksum */
|
|
sum = csum_fold(csum_add(NAPI_GRO_CB(skb)->csum, wsum));
|
|
/* See comments in __skb_checksum_complete(). */
|
|
if (likely(!sum)) {
|
|
if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE) &&
|
|
!skb->csum_complete_sw)
|
|
netdev_rx_csum_fault(skb->dev, skb);
|
|
}
|
|
|
|
NAPI_GRO_CB(skb)->csum = wsum;
|
|
NAPI_GRO_CB(skb)->csum_valid = 1;
|
|
|
|
return sum;
|
|
}
|
|
EXPORT_SYMBOL(__skb_gro_checksum_complete);
|