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Ilias Apalodimas 4d4266e3fd page_pool: add a comment explaining the fragment counter usage 
When reading the page_pool code the first impression is that keeping
two separate counters, one being the page refcnt and the other being
fragment pp_frag_count, is counter-intuitive.

However without that fragment counter we don't know when to reliably
destroy or sync the outstanding DMA mappings.  So let's add a comment
explaining this part.

Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Link: https://lore.kernel.org/r/20230217222130.85205-1-ilias.apalodimas@linaro.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2023-02-21 09:15:39 -08:00
..
9p
net/9p: distinguish zero-copy requests
2022-12-06 07:30:55 +09:00
bluetooth
Bluetooth: MGMT: add CIS feature bits to controller information
2023-02-09 14:18:27 -08:00
caif
net: remove the caif_hsi driver
2021-07-01 13:19:48 -07:00
iucv
net/af_iucv: Use struct_group() to zero struct iucv_sock region
2021-11-19 11:52:25 +00:00
mana
net: mana: Fix IRQ name - add PCI and queue number
2023-01-20 18:17:17 -08:00
netfilter
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf-next
2023-02-20 10:53:56 +00:00
netns
net: make default_rps_mask a per netns attribute
2023-02-20 11:22:54 +00:00
nfc
NFC: add NCI_UNREG flag to eliminate the race
2021-11-17 20:17:05 -08:00
phonet
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
sctp
sctp: delete free member from struct sctp_sched_ops
2022-12-01 20:14:23 -08:00
tc_act
net/sched: act_connmark: transition to percpu stats and rcu
2023-02-16 10:39:28 +01:00
6lowpan.h
…
act_api.h
net/sched: Rename user cookie and act cookie
2023-02-20 16:46:10 -08:00
addrconf.h
ipv6/addrconf: fix a null-ptr-deref bug for ip6_ptr
2022-07-28 10:42:44 -07:00
af_ieee802154.h
…
af_rxrpc.h
rxrpc: Tidy up abort generation infrastructure
2023-01-06 09:43:32 +00:00
af_unix.h
af_unix: Remove unix_table_locks.
2022-06-22 12:59:43 +01:00
af_vsock.h
vsock: add API call for data ready
2022-08-23 10:43:11 +02:00
ah.h
…
amt.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
arp.h
ipv4: Invalidate neighbour for broadcast address upon address addition
2022-02-21 11:44:30 +00:00
atmclip.h
…
ax25.h
ax25: fix incorrect dev_tracker usage
2022-07-28 22:06:15 -07:00
ax88796.h
ax88796: Fix some typo in a comment
2022-08-09 22:14:02 -07:00
bareudp.h
bareudp: Move definition of struct bareudp_conf to bareudp.c
2021-12-13 12:34:09 +00:00
bond_3ad.h
net: bonding: Share lacpdu_mcast_addr definition
2022-09-16 14:34:01 +01:00
bond_alb.h
bonding (gcc13): synchronize bond_{a,t}lb_xmit() types
2022-11-02 20:38:13 -07:00
bond_options.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
bonding.h
bond: Disable TLS features indication
2022-10-27 12:45:38 +02:00
bpf_sk_storage.h
bpf: struct sock is declared twice in bpf_sk_storage header
2021-03-26 17:43:55 +01:00
busy_poll.h
net: Fix a data-race around sysctl_net_busy_poll.
2022-08-24 13:46:58 +01:00
calipso.h
…
cfg80211-wext.h
wifi: cfg80211: Avoid clashing function prototypes
2022-11-16 11:31:47 +02:00
cfg80211.h
wifi: cfg80211: remove gfp parameter from cfg80211_obss_color_collision_notify description
2023-02-15 18:28:52 +01:00
cfg802154.h
ieee802154: Add support for user beaconing requests
2023-01-28 13:51:22 +01:00
checksum.h
net: checksum: drop the linux/uaccess.h include
2023-01-27 11:19:46 +00:00
cipso_ipv4.h
cipso: Remove unused inline functions
2020-07-15 07:45:24 -07:00
cls_cgroup.h
…
codel_impl.h
codel: remove unnecessary sock.h include
2021-12-22 15:03:47 -08:00
codel_qdisc.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
codel.h
codel: remove unnecessary pkt_sched.h include
2021-12-22 15:03:51 -08:00
compat.h
net: copy from user before calling __get_compat_msghdr
2022-07-24 18:39:17 -06:00
datalink.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
dcbevent.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
dcbnl.h
net: dcb: add helper functions to retrieve PCP and DSCP rewrite maps
2023-01-20 09:33:22 +00:00
devlink.h
devlink: fix the name of value arg of devl_param_driverinit_value_get()
2023-02-13 09:49:14 +00:00
dropreason.h
ipv6: icmp6: add SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST
2023-02-20 08:54:23 +00:00
dsa.h
net: dsa: add plumbing for changing and getting MAC merge layer state
2023-01-23 12:44:18 +00:00
dsfield.h
…
dst_cache.h
wireguard: device: reset peer src endpoint when netns exits
2021-11-29 19:50:45 -08:00
dst_metadata.h
xfrm: interface: Add unstable helpers for setting/getting XFRM metadata from TC-BPF
2022-12-05 21:58:27 -08:00
dst_ops.h
ipv6: remove max_size check inline with ipv4
2023-01-13 20:59:14 -08:00
dst.h
net: add atomic_long_t to net_device_stats fields
2022-11-16 12:48:44 +00:00
erspan.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
esp.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
espintcp.h
…
ethoc.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
failover.h
net: failover: add net device refcount tracker
2021-12-06 16:06:02 -08:00
fib_notifier.h
…
fib_rules.h
fib: expand fib_rule_policy
2021-12-16 07:18:35 -08:00
firewire.h
firewire: net: Make use of get_unaligned_be48(), put_unaligned_be48()
2022-07-28 22:21:54 -07:00
flow_dissector.h
flow_dissector: Add L2TPv3 dissectors
2022-09-20 09:13:38 +02:00
flow_offload.h
net/sched: cls_api: Support hardware miss to tc action
2023-02-20 16:46:10 -08:00
flow.h
net: remove unnecessary includes from net/flow.h
2023-01-27 11:19:46 +00:00
fou.h
…
fq_impl.h
wifi: mac80211: add support for restricting netdev features per vif
2022-12-01 15:09:10 +01:00
fq.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
garp.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
gen_stats.h
net: sched: Remove Qdisc::running sequence counter
2021-10-18 12:54:41 +01:00
genetlink.h
mptcp: more detailed error reporting on endpoint creation
2022-11-21 13:09:07 +00:00
geneve.h
net: geneve: fix array of flexible structures warnings
2022-10-31 10:43:04 +00:00
gre.h
ip_gre: add csum offload support for gre header
2021-01-29 20:39:14 -08:00
gro_cells.h
…
gro.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2022-08-25 16:07:42 -07:00
gtp.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
gue.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
hwbm.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
icmp.h
ipv6: ICMPV6: add response to ICMPV6 RFC 8335 PROBE messages
2021-06-28 14:29:45 -07:00
ieee80211_radiotap.h
ieee80211: radiotap: fix -Wcast-qual warnings
2022-02-04 16:25:21 +01:00
ieee802154_netdev.h
mac802154: Handle basic beaconing
2023-01-28 13:55:10 +01:00
if_inet6.h
ipv6: fix locking issues with loops over idev->addr_list
2022-04-06 22:09:39 -07:00
ife.h
…
ila.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
inet6_connection_sock.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
inet6_hashtables.h
net: allow unbound socket for packets in VRF when tcp_l3mdev_accept set
2022-07-29 11:58:54 +01:00
inet_common.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
inet_connection_sock.h
net: Add a bhash2 table hashed by port and address
2022-08-24 19:30:07 -07:00
inet_dscp.h
ipv6: Define dscp_t and stop taking ECN bits into account in fib6-rules
2022-02-07 20:12:45 -08:00
inet_ecn.h
net: add skb_get_dsfield() helper
2021-10-15 11:33:08 +01:00
inet_frag.h
net: dropreason: add SKB_DROP_REASON_FRAG_REASM_TIMEOUT
2022-10-31 20:14:27 -07:00
inet_hashtables.h
tcp: Add TIME_WAIT sockets in bhash2.
2022-12-30 07:25:52 +00:00
inet_sock.h
inet: Add IP_LOCAL_PORT_RANGE socket option
2023-01-25 22:45:00 -08:00
inet_timewait_sock.h
tcp: Add TIME_WAIT sockets in bhash2.
2022-12-30 07:25:52 +00:00
inetpeer.h
…
ioam6.h
treewide: Replace zero-length arrays with flexible-array members
2022-02-17 07:00:39 -06:00
ip6_checksum.h
net: move gro definitions to include/net/gro.h
2021-11-16 13:16:54 +00:00
ip6_fib.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2022-02-17 11:44:20 -08:00
ip6_route.h
ipv6: Make ip6_route_output_flags_noref() static.
2023-01-24 18:12:52 -08:00
ip6_tunnel.h
ip_gre, ip6_gre: Fix race condition on o_seqno in collect_md mode
2022-04-25 11:40:45 +01:00
ip_fib.h
ipv4: Use dscp_t in struct fib_entry_notifier_info
2022-04-11 17:37:50 -07:00
ip_tunnels.h
net: Add helper function to parse netlink msg of ip_tunnel_parm
2022-10-03 07:59:06 +01:00
ip_vs.h
ipvs: avoid kfree_rcu without 2nd arg
2023-02-02 14:02:01 +01:00
ip.h
inet: Add IP_LOCAL_PORT_RANGE socket option
2023-01-25 22:45:00 -08:00
ipcomp.h
xfrm: ipcomp: add extack to ipcomp{4,6}_init_state
2022-09-29 07:18:00 +02:00
ipconfig.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
ipv6_frag.h
net: dropreason: add SKB_DROP_REASON_FRAG_REASM_TIMEOUT
2022-10-31 20:14:27 -07:00
ipv6_stubs.h
bpf: Change bpf_getsockopt(SOL_IPV6) to reuse do_ipv6_getsockopt()
2022-09-02 20:34:32 -07:00
ipv6.h
ipv6: icmp6: add drop reason support to icmpv6_notify()
2023-02-13 19:55:32 -08:00
iw_handler.h
…
kcm.h
…
l3mdev.h
…
lag.h
…
lapb.h
net: lapb: Make "lapb_t1timer_running" able to detect an already running timer
2021-03-23 14:14:50 -07:00
lib80211.h
…
llc_c_ac.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
llc_c_ev.h
…
llc_c_st.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
llc_conn.h
llc: add net device refcount tracker
2021-12-07 20:44:59 -08:00
llc_if.h
llc/snap: constify dev_addr passing
2021-10-13 09:40:46 -07:00
llc_pdu.h
net: llc: fix skb_over_panic
2021-07-27 13:05:56 +01:00
llc_s_ac.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
llc_s_ev.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
llc_s_st.h
add missing includes and forward declarations to networking includes under linux/
2022-07-28 11:29:36 +02:00
llc_sap.h
…
llc.h
llc: fix out-of-bound array index in llc_sk_dev_hash()
2021-11-07 19:25:29 +00:00
lwtunnel.h
netfilter: add netfilter hooks to SRv6 data plane
2021-08-30 01:51:36 +02:00
mac80211.h
wifi: mac80211: configure puncturing bitmap
2023-02-14 12:17:22 +01:00
mac802154.h
mac802154: Drop IEEE802154_HW_RX_DROP_BAD_CKSUM
2022-10-12 12:57:19 +02:00
macsec.h
net: macsec: remove the prepare flag from the MACsec offloading context
2022-09-23 06:56:08 -07:00
mctp.h
mctp: Use output netdev to allocate skb headroom
2022-04-01 12:04:15 +01:00
mctpdevice.h
mctp: Pass flow data & flow release events to drivers
2021-10-29 13:23:51 +01:00
mip6.h
…
mld.h
mld: add new workqueues for process mld events
2021-03-26 15:14:56 -07:00
mpls_iptunnel.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
mpls.h
…
mptcp.h
mptcp: remove MPTCP 'ifdef' in TCP SYN cookies
2022-12-12 13:11:24 -08:00
mrp.h
mrp: introduce active flags to prevent UAF when applicant uninit
2022-11-18 12:14:55 +00:00
ncsi.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
ndisc.h
ipv6: icmp6: add drop reason support to ndisc_rcv()
2023-02-13 19:55:32 -08:00
neighbour.h
net: neigh: decrement the family specific qlen
2022-11-18 10:29:50 +00:00
net_debug.h
net: add CONFIG_DEBUG_NET
2022-05-11 12:43:10 +01:00
net_failover.h
…
net_namespace.h
net: add a refcount tracker for kernel sockets
2022-10-24 11:04:43 +01:00
net_ratelimit.h
…
net_trackers.h
net: add networking namespace refcount tracker
2021-12-10 06:38:26 -08:00
netevent.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
netlabel.h
…
netlink.h
net: netlink: recommend policy range validation
2023-01-28 00:33:51 -08:00
netprio_cgroup.h
…
netrom.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
nexthop.h
net: ipv4: Fix rtnexthop len when RTA_FLOW is present
2021-09-24 14:07:10 +01:00
nl802154.h
ieee802154: Add support for user beaconing requests
2023-01-28 13:51:22 +01:00
nsh.h
…
p8022.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
page_pool.h
page_pool: add a comment explaining the fragment counter usage
2023-02-21 09:15:39 -08:00
pie.h
…
ping.h
inet: ping: use hlist_nulls rcu iterator during lookup
2022-12-01 12:42:46 +01:00
pkt_cls.h
net/sched: cls_api: Support hardware miss to tc action
2023-02-20 16:46:10 -08:00
pkt_sched.h
net/sched: taprio: give higher priority to higher TCs in software dequeue mode
2023-02-08 09:48:52 +00:00
pptp.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
protocol.h
tcp/udp: Make early_demux back namespacified.
2022-07-15 18:50:35 -07:00
psample.h
psample: Add a fwd declaration for skbuff
2021-08-09 15:34:21 -07:00
psnap.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
raw.h
raw: use net_hash_mix() in hash function
2023-02-03 19:56:23 -08:00
rawv6.h
raw: convert raw sockets to RCU
2022-06-19 10:00:02 +01:00
red.h
treewide: use get_random_u32() when possible
2022-10-11 17:42:58 -06:00
regulatory.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
request_sock.h
tcp: Use BPF timeout setting for SYN ACK RTO
2022-02-02 14:45:18 +00:00
rose.h
net: rose: add netdev ref tracker to 'struct rose_sock'
2022-08-01 11:59:23 -07:00
route.h
net: add a couple of helpers for iph tot_len
2023-02-01 20:54:27 -08:00
rpl.h
…
rsi_91x.h
…
rtnetlink.h
rtnetlink: Honour NLM_F_ECHO flag in rtnl_delete_link
2022-10-31 18:10:21 -07:00
rtnh.h
…
sch_generic.h
net/sched: cls_api: Support hardware miss to tc action
2023-02-20 16:46:10 -08:00
scm.h
fs: Move __scm_install_fd() to __receive_fd()
2020-07-13 11:03:44 -07:00
secure_seq.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
seg6_hmac.h
…
seg6_local.h
…
seg6.h
udp6: Use Segment Routing Header for dest address if present
2022-01-04 12:17:35 +00:00
selftests.h
net: selftest: fix build issue if INET is disabled
2021-04-28 14:06:45 -07:00
slhc_vj.h
…
smc.h
net/smc: De-tangle ism and smc device initialization
2023-01-25 09:46:49 +00:00
snmp.h
…
sock_reuseport.h
soreuseport: Fix socket selection for SO_INCOMING_CPU.
2022-10-25 11:35:16 +02:00
sock.h
Merge ra.kernel.org:/pub/scm/linux/kernel/git/netdev/net
2023-02-17 11:06:39 +00:00
Space.h
wan: remove sbni/granch driver
2021-08-03 13:05:26 +01:00
stp.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
strparser.h
tls: rx: remove the message decrypted tracking
2022-07-18 11:24:10 +01:00
switchdev.h
bridge: switchdev: Allow device drivers to install locked FDB entries
2022-11-09 19:06:13 -08:00
tc_wrapper.h
net/sched: Retire rsvp classifier
2023-02-16 09:27:07 +01:00
tcp_states.h
…
tcp.h
bpf-next-for-netdev
2022-12-12 11:27:42 -08:00
timewait_sock.h
…
tipc.h
…
tls_toe.h
…
tls.h
net/tls: Describe ciphers sizes by const structs
2022-09-22 17:27:41 -07:00
transp_v6.h
inet6: Remove inet6_destroy_sock().
2022-10-24 09:40:39 +01:00
tso.h
net: tso: inline tso_count_descs()
2022-12-12 15:04:39 -08:00
tun_proto.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
udp_tunnel.h
net: Change the udp encap_err_rcv to allow use of {ip,ipv6}_icmp_error()
2022-11-08 16:42:28 +00:00
udp.h
udp: track the forward memory release threshold in an hot cacheline
2022-10-24 10:52:50 +01:00
udplite.h
tcp/udp: Call inet6_destroy_sock() in IPv6 sk->sk_destruct().
2022-10-12 17:50:37 -07:00
vsock_addr.h
…
vxlan.h
drivers: vxlan: vnifilter: per vni stats
2022-03-01 08:38:02 +00:00
wext.h
…
x25.h
…
x25device.h
…
xdp_priv.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
xdp_sock_drv.h
xsk: Remove unused xsk_buff_discard
2022-09-30 07:55:46 -07:00
xdp_sock.h
net: Don't include filter.h from net/sock.h
2021-12-29 08:48:14 -08:00
xdp.h
drivers: net: turn on XDP features
2023-02-02 20:48:23 -08:00
xfrm.h
bpf-next-for-netdev
2022-12-12 11:27:42 -08:00
xsk_buff_pool.h
xsk: Add cb area to struct xdp_buff_xsk
2023-01-23 09:58:23 -08:00