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WSL2-Linux-Kernel
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net: gro: populate net/core/gro.c 

Move gro code and data from net/core/dev.c to net/core/gro.c
to ease maintenance.

gro_normal_list() and gro_normal_one() are inlined
because they are called from both files.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2021-11-15 09:05:54 -08:00 коммит произвёл David S. Miller
Родитель e456a18a39
Коммит 587652bbdd
4 изменённых файлов: 672 добавлений и 667 удалений
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1
include/linux/netdevice.h
Просмотреть файл

@ -3657,6 +3657,7 @@ int netif_rx_ni(struct sk_buff *skb);
int netif_rx_any_context(struct sk_buff *skb);
int netif_receive_skb(struct sk_buff *skb);
int netif_receive_skb_core(struct sk_buff *skb);
void netif_receive_skb_list_internal(struct list_head *head);
void netif_receive_skb_list(struct list_head *head);
gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb);
void napi_gro_flush(struct napi_struct *napi, bool flush_old);

22
include/net/gro.h
Просмотреть файл

@ -416,4 +416,26 @@ static inline __wsum ip6_gro_compute_pseudo(struct sk_buff *skb, int proto)
int skb_gro_receive(struct sk_buff *p, struct sk_buff *skb);
/* Pass the currently batched GRO_NORMAL SKBs up to the stack. */
static inline void gro_normal_list(struct napi_struct *napi)
{
if (!napi->rx_count)
return;
netif_receive_skb_list_internal(&napi->rx_list);
INIT_LIST_HEAD(&napi->rx_list);
napi->rx_count = 0;
}
/* Queue one GRO_NORMAL SKB up for list processing. If batch size exceeded,
* pass the whole batch up to the stack.
*/
static inline void gro_normal_one(struct napi_struct *napi, struct sk_buff *skb, int segs)
{
list_add_tail(&skb->list, &napi->rx_list);
napi->rx_count += segs;
if (napi->rx_count >= gro_normal_batch)
gro_normal_list(napi);
}
#endif /* _NET_IPV6_GRO_H */

668
net/core/dev.c
Просмотреть файл

@ -153,16 +153,10 @@
#include "net-sysfs.h"
#define MAX_GRO_SKBS 8
/* This should be increased if a protocol with a bigger head is added. */
#define GRO_MAX_HEAD (MAX_HEADER + 128)
static DEFINE_SPINLOCK(ptype_lock);
static DEFINE_SPINLOCK(offload_lock);
struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
struct list_head ptype_all __read_mostly; /* Taps */
static struct list_head offload_base __read_mostly;
static int netif_rx_internal(struct sk_buff *skb);
static int call_netdevice_notifiers_info(unsigned long val,
@ -604,84 +598,6 @@ void dev_remove_pack(struct packet_type *pt)
EXPORT_SYMBOL(dev_remove_pack);
/**
* dev_add_offload - register offload handlers
* @po: protocol offload declaration
*
* Add protocol offload handlers to the networking stack. The passed
* &proto_offload is linked into kernel lists and may not be freed until
* it has been removed from the kernel lists.
*
* This call does not sleep therefore it can not
* guarantee all CPU's that are in middle of receiving packets
* will see the new offload handlers (until the next received packet).
*/
void dev_add_offload(struct packet_offload *po)
{
struct packet_offload *elem;
spin_lock(&offload_lock);
list_for_each_entry(elem, &offload_base, list) {
if (po->priority < elem->priority)
break;
}
list_add_rcu(&po->list, elem->list.prev);
spin_unlock(&offload_lock);
}
EXPORT_SYMBOL(dev_add_offload);
/**
* __dev_remove_offload - remove offload handler
* @po: packet offload declaration
*
* Remove a protocol offload handler that was previously added to the
* kernel offload handlers by dev_add_offload(). The passed &offload_type
* is removed from the kernel lists and can be freed or reused once this
* function returns.
*
* The packet type might still be in use by receivers
* and must not be freed until after all the CPU's have gone
* through a quiescent state.
*/
static void __dev_remove_offload(struct packet_offload *po)
{
struct list_head *head = &offload_base;
struct packet_offload *po1;
spin_lock(&offload_lock);
list_for_each_entry(po1, head, list) {
if (po == po1) {
list_del_rcu(&po->list);
goto out;
}
}
pr_warn("dev_remove_offload: %p not found\n", po);
out:
spin_unlock(&offload_lock);
}
/**
* dev_remove_offload - remove packet offload handler
* @po: packet offload declaration
*
* Remove a packet offload handler that was previously added to the kernel
* offload handlers by dev_add_offload(). The passed &offload_type is
* removed from the kernel lists and can be freed or reused once this
* function returns.
*
* This call sleeps to guarantee that no CPU is looking at the packet
* type after return.
*/
void dev_remove_offload(struct packet_offload *po)
{
__dev_remove_offload(po);
synchronize_net();
}
EXPORT_SYMBOL(dev_remove_offload);
/*******************************************************************************
*
* Device Interface Subroutines
@ -3315,40 +3231,6 @@ __be16 skb_network_protocol(struct sk_buff *skb, int *depth)
return __vlan_get_protocol(skb, type, depth);
}
/**
* skb_mac_gso_segment - mac layer segmentation handler.
* @skb: buffer to segment
* @features: features for the output path (see dev->features)
*/
struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
netdev_features_t features)
{
struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
struct packet_offload *ptype;
int vlan_depth = skb->mac_len;
__be16 type = skb_network_protocol(skb, &vlan_depth);
if (unlikely(!type))
return ERR_PTR(-EINVAL);
__skb_pull(skb, vlan_depth);
rcu_read_lock();
list_for_each_entry_rcu(ptype, &offload_base, list) {
if (ptype->type == type && ptype->callbacks.gso_segment) {
segs = ptype->callbacks.gso_segment(skb, features);
break;
}
}
rcu_read_unlock();
__skb_push(skb, skb->data - skb_mac_header(skb));
return segs;
}
EXPORT_SYMBOL(skb_mac_gso_segment);
/* openvswitch calls this on rx path, so we need a different check.
*/
static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path)
@ -4320,8 +4202,6 @@ int dev_weight_rx_bias __read_mostly = 1; /* bias for backlog weight */
int dev_weight_tx_bias __read_mostly = 1; /* bias for output_queue quota */
int dev_rx_weight __read_mostly = 64;
int dev_tx_weight __read_mostly = 64;
/* Maximum number of GRO_NORMAL skbs to batch up for list-RX */
int gro_normal_batch __read_mostly = 8;
/* Called with irq disabled */
static inline void ____napi_schedule(struct softnet_data *sd,
@ -5664,7 +5544,7 @@ static int netif_receive_skb_internal(struct sk_buff *skb)
return ret;
}
static void netif_receive_skb_list_internal(struct list_head *head)
void netif_receive_skb_list_internal(struct list_head *head)
{
struct sk_buff *skb, *next;
struct list_head sublist;
@ -5842,550 +5722,6 @@ static void flush_all_backlogs(void)
cpus_read_unlock();
}
/* Pass the currently batched GRO_NORMAL SKBs up to the stack. */
static void gro_normal_list(struct napi_struct *napi)
{
if (!napi->rx_count)
return;
netif_receive_skb_list_internal(&napi->rx_list);
INIT_LIST_HEAD(&napi->rx_list);
napi->rx_count = 0;
}
/* Queue one GRO_NORMAL SKB up for list processing. If batch size exceeded,
* pass the whole batch up to the stack.
*/
static void gro_normal_one(struct napi_struct *napi, struct sk_buff *skb, int segs)
{
list_add_tail(&skb->list, &napi->rx_list);
napi->rx_count += segs;
if (napi->rx_count >= gro_normal_batch)
gro_normal_list(napi);
}
static void napi_gro_complete(struct napi_struct *napi, struct sk_buff *skb)
{
struct packet_offload *ptype;
__be16 type = skb->protocol;
struct list_head *head = &offload_base;
int err = -ENOENT;
BUILD_BUG_ON(sizeof(struct napi_gro_cb) > sizeof(skb->cb));
if (NAPI_GRO_CB(skb)->count == 1) {
skb_shinfo(skb)->gso_size = 0;
goto out;
}
rcu_read_lock();
list_for_each_entry_rcu(ptype, head, list) {
if (ptype->type != type || !ptype->callbacks.gro_complete)
continue;
err = INDIRECT_CALL_INET(ptype->callbacks.gro_complete,
ipv6_gro_complete, inet_gro_complete,
skb, 0);
break;
}
rcu_read_unlock();
if (err) {
WARN_ON(&ptype->list == head);
kfree_skb(skb);
return;
}
out:
gro_normal_one(napi, skb, NAPI_GRO_CB(skb)->count);
}
static void __napi_gro_flush_chain(struct napi_struct *napi, u32 index,
bool flush_old)
{
struct list_head *head = &napi->gro_hash[index].list;
struct sk_buff *skb, *p;
list_for_each_entry_safe_reverse(skb, p, head, list) {
if (flush_old && NAPI_GRO_CB(skb)->age == jiffies)
return;
skb_list_del_init(skb);
napi_gro_complete(napi, skb);
napi->gro_hash[index].count--;
}
if (!napi->gro_hash[index].count)
__clear_bit(index, &napi->gro_bitmask);
}
/* napi->gro_hash[].list contains packets ordered by age.
* youngest packets at the head of it.
* Complete skbs in reverse order to reduce latencies.
*/
void napi_gro_flush(struct napi_struct *napi, bool flush_old)
{
unsigned long bitmask = napi->gro_bitmask;
unsigned int i, base = ~0U;
while ((i = ffs(bitmask)) != 0) {
bitmask >>= i;
base += i;
__napi_gro_flush_chain(napi, base, flush_old);
}
}
EXPORT_SYMBOL(napi_gro_flush);
static void gro_list_prepare(const struct list_head *head,
const struct sk_buff *skb)
{
unsigned int maclen = skb->dev->hard_header_len;
u32 hash = skb_get_hash_raw(skb);
struct sk_buff *p;
list_for_each_entry(p, head, list) {
unsigned long diffs;
NAPI_GRO_CB(p)->flush = 0;
if (hash != skb_get_hash_raw(p)) {
NAPI_GRO_CB(p)->same_flow = 0;
continue;
}
diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
diffs |= skb_vlan_tag_present(p) ^ skb_vlan_tag_present(skb);
if (skb_vlan_tag_present(p))
diffs |= skb_vlan_tag_get(p) ^ skb_vlan_tag_get(skb);
diffs |= skb_metadata_differs(p, skb);
if (maclen == ETH_HLEN)
diffs |= compare_ether_header(skb_mac_header(p),
skb_mac_header(skb));
else if (!diffs)
diffs = memcmp(skb_mac_header(p),
skb_mac_header(skb),
maclen);
/* in most common scenarions 'slow_gro' is 0
* otherwise we are already on some slower paths
* either skip all the infrequent tests altogether or
* avoid trying too hard to skip each of them individually
*/
if (!diffs && unlikely(skb->slow_gro | p->slow_gro)) {
#if IS_ENABLED(CONFIG_SKB_EXTENSIONS) && IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
struct tc_skb_ext *skb_ext;
struct tc_skb_ext *p_ext;
#endif
diffs |= p->sk != skb->sk;
diffs |= skb_metadata_dst_cmp(p, skb);
diffs |= skb_get_nfct(p) ^ skb_get_nfct(skb);
#if IS_ENABLED(CONFIG_SKB_EXTENSIONS) && IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
skb_ext = skb_ext_find(skb, TC_SKB_EXT);
p_ext = skb_ext_find(p, TC_SKB_EXT);
diffs |= (!!p_ext) ^ (!!skb_ext);
if (!diffs && unlikely(skb_ext))
diffs |= p_ext->chain ^ skb_ext->chain;
#endif
}
NAPI_GRO_CB(p)->same_flow = !diffs;
}
}
static inline void skb_gro_reset_offset(struct sk_buff *skb, u32 nhoff)
{
const struct skb_shared_info *pinfo = skb_shinfo(skb);
const skb_frag_t *frag0 = &pinfo->frags[0];
NAPI_GRO_CB(skb)->data_offset = 0;
NAPI_GRO_CB(skb)->frag0 = NULL;
NAPI_GRO_CB(skb)->frag0_len = 0;
if (!skb_headlen(skb) && pinfo->nr_frags &&
!PageHighMem(skb_frag_page(frag0)) &&
(!NET_IP_ALIGN || !((skb_frag_off(frag0) + nhoff) & 3))) {
NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0);
NAPI_GRO_CB(skb)->frag0_len = min_t(unsigned int,
skb_frag_size(frag0),
skb->end - skb->tail);
}
}
static void gro_pull_from_frag0(struct sk_buff *skb, int grow)
{
struct skb_shared_info *pinfo = skb_shinfo(skb);
BUG_ON(skb->end - skb->tail < grow);
memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
skb->data_len -= grow;
skb->tail += grow;
skb_frag_off_add(&pinfo->frags[0], grow);
skb_frag_size_sub(&pinfo->frags[0], grow);
if (unlikely(!skb_frag_size(&pinfo->frags[0]))) {
skb_frag_unref(skb, 0);
memmove(pinfo->frags, pinfo->frags + 1,
--pinfo->nr_frags * sizeof(pinfo->frags[0]));
}
}
static void gro_flush_oldest(struct napi_struct *napi, struct list_head *head)
{
struct sk_buff *oldest;
oldest = list_last_entry(head, struct sk_buff, list);
/* We are called with head length >= MAX_GRO_SKBS, so this is
* impossible.
*/
if (WARN_ON_ONCE(!oldest))
return;
/* Do not adjust napi->gro_hash[].count, caller is adding a new
* SKB to the chain.
*/
skb_list_del_init(oldest);
napi_gro_complete(napi, oldest);
}
static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
{
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);
NAPI_GRO_CB(skb)->same_flow = 0;
NAPI_GRO_CB(skb)->flush = skb_is_gso(skb) || skb_has_frag_list(skb);
NAPI_GRO_CB(skb)->free = 0;
NAPI_GRO_CB(skb)->encap_mark = 0;
NAPI_GRO_CB(skb)->recursion_counter = 0;
NAPI_GRO_CB(skb)->is_fou = 0;
NAPI_GRO_CB(skb)->is_atomic = 1;
NAPI_GRO_CB(skb)->gro_remcsum_start = 0;
/* 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;
NAPI_GRO_CB(skb)->csum_cnt = 0;
break;
case CHECKSUM_UNNECESSARY:
NAPI_GRO_CB(skb)->csum_cnt = skb->csum_level + 1;
NAPI_GRO_CB(skb)->csum_valid = 0;
break;
default:
NAPI_GRO_CB(skb)->csum_cnt = 0;
NAPI_GRO_CB(skb)->csum_valid = 0;
}
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;
skb->truesize = SKB_TRUESIZE(skb_end_offset(skb));
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);
static void net_rps_send_ipi(struct softnet_data *remsd)
{
#ifdef CONFIG_RPS
@ -11640,8 +10976,6 @@ static int __init net_dev_init(void)
for (i = 0; i < PTYPE_HASH_SIZE; i++)
INIT_LIST_HEAD(&ptype_base[i]);
INIT_LIST_HEAD(&offload_base);
if (register_pernet_subsys(&netdev_net_ops))
goto out;

648
net/core/gro.c
Просмотреть файл

@ -1,5 +1,129 @@
// SPDX-License-Identifier: GPL-2.0-or-later
#include <net/gro.h>
#include <net/dst_metadata.h>
#include <net/busy_poll.h>
#include <trace/events/net.h>
#define MAX_GRO_SKBS 8
/* This should be increased if a protocol with a bigger head is added. */
#define GRO_MAX_HEAD (MAX_HEADER + 128)
static DEFINE_SPINLOCK(offload_lock);
static struct list_head offload_base __read_mostly = LIST_HEAD_INIT(offload_base);
/* Maximum number of GRO_NORMAL skbs to batch up for list-RX */
int gro_normal_batch __read_mostly = 8;
/**
* dev_add_offload - register offload handlers
* @po: protocol offload declaration
*
* Add protocol offload handlers to the networking stack. The passed
* &proto_offload is linked into kernel lists and may not be freed until
* it has been removed from the kernel lists.
*
* This call does not sleep therefore it can not
* guarantee all CPU's that are in middle of receiving packets
* will see the new offload handlers (until the next received packet).
*/
void dev_add_offload(struct packet_offload *po)
{
struct packet_offload *elem;
spin_lock(&offload_lock);
list_for_each_entry(elem, &offload_base, list) {
if (po->priority < elem->priority)
break;
}
list_add_rcu(&po->list, elem->list.prev);
spin_unlock(&offload_lock);
}
EXPORT_SYMBOL(dev_add_offload);
/**
* __dev_remove_offload - remove offload handler
* @po: packet offload declaration
*
* Remove a protocol offload handler that was previously added to the
* kernel offload handlers by dev_add_offload(). The passed &offload_type
* is removed from the kernel lists and can be freed or reused once this
* function returns.
*
* The packet type might still be in use by receivers
* and must not be freed until after all the CPU's have gone
* through a quiescent state.
*/
static void __dev_remove_offload(struct packet_offload *po)
{
struct list_head *head = &offload_base;
struct packet_offload *po1;
spin_lock(&offload_lock);
list_for_each_entry(po1, head, list) {
if (po == po1) {
list_del_rcu(&po->list);
goto out;
}
}
pr_warn("dev_remove_offload: %p not found\n", po);
out:
spin_unlock(&offload_lock);
}
/**
* dev_remove_offload - remove packet offload handler
* @po: packet offload declaration
*
* Remove a packet offload handler that was previously added to the kernel
* offload handlers by dev_add_offload(). The passed &offload_type is
* removed from the kernel lists and can be freed or reused once this
* function returns.
*
* This call sleeps to guarantee that no CPU is looking at the packet
* type after return.
*/
void dev_remove_offload(struct packet_offload *po)
{
__dev_remove_offload(po);
synchronize_net();
}
EXPORT_SYMBOL(dev_remove_offload);
/**
* skb_mac_gso_segment - mac layer segmentation handler.
* @skb: buffer to segment
* @features: features for the output path (see dev->features)
*/
struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
netdev_features_t features)
{
struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
struct packet_offload *ptype;
int vlan_depth = skb->mac_len;
__be16 type = skb_network_protocol(skb, &vlan_depth);
if (unlikely(!type))
return ERR_PTR(-EINVAL);
__skb_pull(skb, vlan_depth);
rcu_read_lock();
list_for_each_entry_rcu(ptype, &offload_base, list) {
if (ptype->type == type && ptype->callbacks.gso_segment) {
segs = ptype->callbacks.gso_segment(skb, features);
break;
}
}
rcu_read_unlock();
__skb_push(skb, skb->data - skb_mac_header(skb));
return segs;
}
EXPORT_SYMBOL(skb_mac_gso_segment);
int skb_gro_receive(struct sk_buff *p, struct sk_buff *skb)
{
@ -116,3 +240,527 @@ done:
NAPI_GRO_CB(skb)->same_flow = 1;
return 0;
}
static void napi_gro_complete(struct napi_struct *napi, struct sk_buff *skb)
{
struct packet_offload *ptype;
__be16 type = skb->protocol;
struct list_head *head = &offload_base;
int err = -ENOENT;
BUILD_BUG_ON(sizeof(struct napi_gro_cb) > sizeof(skb->cb));
if (NAPI_GRO_CB(skb)->count == 1) {
skb_shinfo(skb)->gso_size = 0;
goto out;
}
rcu_read_lock();
list_for_each_entry_rcu(ptype, head, list) {
if (ptype->type != type || !ptype->callbacks.gro_complete)
continue;
err = INDIRECT_CALL_INET(ptype->callbacks.gro_complete,
ipv6_gro_complete, inet_gro_complete,
skb, 0);
break;
}
rcu_read_unlock();
if (err) {
WARN_ON(&ptype->list == head);
kfree_skb(skb);
return;
}
out:
gro_normal_one(napi, skb, NAPI_GRO_CB(skb)->count);
}
static void __napi_gro_flush_chain(struct napi_struct *napi, u32 index,
bool flush_old)
{
struct list_head *head = &napi->gro_hash[index].list;
struct sk_buff *skb, *p;
list_for_each_entry_safe_reverse(skb, p, head, list) {
if (flush_old && NAPI_GRO_CB(skb)->age == jiffies)
return;
skb_list_del_init(skb);
napi_gro_complete(napi, skb);
napi->gro_hash[index].count--;
}
if (!napi->gro_hash[index].count)
__clear_bit(index, &napi->gro_bitmask);
}
/* napi->gro_hash[].list contains packets ordered by age.
* youngest packets at the head of it.
* Complete skbs in reverse order to reduce latencies.
*/
void napi_gro_flush(struct napi_struct *napi, bool flush_old)
{
unsigned long bitmask = napi->gro_bitmask;
unsigned int i, base = ~0U;
while ((i = ffs(bitmask)) != 0) {
bitmask >>= i;
base += i;
__napi_gro_flush_chain(napi, base, flush_old);
}
}
EXPORT_SYMBOL(napi_gro_flush);
static void gro_list_prepare(const struct list_head *head,
const struct sk_buff *skb)
{
unsigned int maclen = skb->dev->hard_header_len;
u32 hash = skb_get_hash_raw(skb);
struct sk_buff *p;
list_for_each_entry(p, head, list) {
unsigned long diffs;
NAPI_GRO_CB(p)->flush = 0;
if (hash != skb_get_hash_raw(p)) {
NAPI_GRO_CB(p)->same_flow = 0;
continue;
}
diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
diffs |= skb_vlan_tag_present(p) ^ skb_vlan_tag_present(skb);
if (skb_vlan_tag_present(p))
diffs |= skb_vlan_tag_get(p) ^ skb_vlan_tag_get(skb);
diffs |= skb_metadata_differs(p, skb);
if (maclen == ETH_HLEN)
diffs |= compare_ether_header(skb_mac_header(p),
skb_mac_header(skb));
else if (!diffs)
diffs = memcmp(skb_mac_header(p),
skb_mac_header(skb),
maclen);
/* in most common scenarions 'slow_gro' is 0
* otherwise we are already on some slower paths
* either skip all the infrequent tests altogether or
* avoid trying too hard to skip each of them individually
*/
if (!diffs && unlikely(skb->slow_gro | p->slow_gro)) {
#if IS_ENABLED(CONFIG_SKB_EXTENSIONS) && IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
struct tc_skb_ext *skb_ext;
struct tc_skb_ext *p_ext;
#endif
diffs |= p->sk != skb->sk;
diffs |= skb_metadata_dst_cmp(p, skb);
diffs |= skb_get_nfct(p) ^ skb_get_nfct(skb);
#if IS_ENABLED(CONFIG_SKB_EXTENSIONS) && IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
skb_ext = skb_ext_find(skb, TC_SKB_EXT);
p_ext = skb_ext_find(p, TC_SKB_EXT);
diffs |= (!!p_ext) ^ (!!skb_ext);
if (!diffs && unlikely(skb_ext))
diffs |= p_ext->chain ^ skb_ext->chain;
#endif
}
NAPI_GRO_CB(p)->same_flow = !diffs;
}
}
static inline void skb_gro_reset_offset(struct sk_buff *skb, u32 nhoff)
{
const struct skb_shared_info *pinfo = skb_shinfo(skb);
const skb_frag_t *frag0 = &pinfo->frags[0];
NAPI_GRO_CB(skb)->data_offset = 0;
NAPI_GRO_CB(skb)->frag0 = NULL;
NAPI_GRO_CB(skb)->frag0_len = 0;
if (!skb_headlen(skb) && pinfo->nr_frags &&
!PageHighMem(skb_frag_page(frag0)) &&
(!NET_IP_ALIGN || !((skb_frag_off(frag0) + nhoff) & 3))) {
NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0);
NAPI_GRO_CB(skb)->frag0_len = min_t(unsigned int,
skb_frag_size(frag0),
skb->end - skb->tail);
}
}
static void gro_pull_from_frag0(struct sk_buff *skb, int grow)
{
struct skb_shared_info *pinfo = skb_shinfo(skb);
BUG_ON(skb->end - skb->tail < grow);
memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
skb->data_len -= grow;
skb->tail += grow;
skb_frag_off_add(&pinfo->frags[0], grow);
skb_frag_size_sub(&pinfo->frags[0], grow);
if (unlikely(!skb_frag_size(&pinfo->frags[0]))) {
skb_frag_unref(skb, 0);
memmove(pinfo->frags, pinfo->frags + 1,
--pinfo->nr_frags * sizeof(pinfo->frags[0]));
}
}
static void gro_flush_oldest(struct napi_struct *napi, struct list_head *head)
{
struct sk_buff *oldest;
oldest = list_last_entry(head, struct sk_buff, list);
/* We are called with head length >= MAX_GRO_SKBS, so this is
* impossible.
*/
if (WARN_ON_ONCE(!oldest))
return;
/* Do not adjust napi->gro_hash[].count, caller is adding a new
* SKB to the chain.
*/
skb_list_del_init(oldest);
napi_gro_complete(napi, oldest);
}
static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
{
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);
NAPI_GRO_CB(skb)->same_flow = 0;
NAPI_GRO_CB(skb)->flush = skb_is_gso(skb) || skb_has_frag_list(skb);
NAPI_GRO_CB(skb)->free = 0;
NAPI_GRO_CB(skb)->encap_mark = 0;
NAPI_GRO_CB(skb)->recursion_counter = 0;
NAPI_GRO_CB(skb)->is_fou = 0;
NAPI_GRO_CB(skb)->is_atomic = 1;
NAPI_GRO_CB(skb)->gro_remcsum_start = 0;
/* 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;
NAPI_GRO_CB(skb)->csum_cnt = 0;
break;
case CHECKSUM_UNNECESSARY:
NAPI_GRO_CB(skb)->csum_cnt = skb->csum_level + 1;
NAPI_GRO_CB(skb)->csum_valid = 0;
break;
default:
NAPI_GRO_CB(skb)->csum_cnt = 0;
NAPI_GRO_CB(skb)->csum_valid = 0;
}
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;
skb->truesize = SKB_TRUESIZE(skb_end_offset(skb));
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);