Merge tag 'net-next-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next

Pull networking updates from Jakub Kicinski:
 "Core:

   - support "prefer busy polling" NAPI operation mode, where we defer
     softirq for some time expecting applications to periodically busy
     poll

   - AF_XDP: improve efficiency by more batching and hindering the
     adjacency cache prefetcher

   - af_packet: make packet_fanout.arr size configurable up to 64K

   - tcp: optimize TCP zero copy receive in presence of partial or
     unaligned reads making zero copy a performance win for much smaller
     messages

   - XDP: add bulk APIs for returning / freeing frames

   - sched: support fragmenting IP packets as they come out of conntrack

   - net: allow virtual netdevs to forward UDP L4 and fraglist GSO skbs

  BPF:

   - BPF switch from crude rlimit-based to memcg-based memory accounting

   - BPF type format information for kernel modules and related tracing
     enhancements

   - BPF implement task local storage for BPF LSM

   - allow the FENTRY/FEXIT/RAW_TP tracing programs to use
     bpf_sk_storage

  Protocols:

   - mptcp: improve multiple xmit streams support, memory accounting and
     many smaller improvements

   - TLS: support CHACHA20-POLY1305 cipher

   - seg6: add support for SRv6 End.DT4/DT6 behavior

   - sctp: Implement RFC 6951: UDP Encapsulation of SCTP

   - ppp_generic: add ability to bridge channels directly

   - bridge: Connectivity Fault Management (CFM) support as is defined
     in IEEE 802.1Q section 12.14.

  Drivers:

   - mlx5: make use of the new auxiliary bus to organize the driver
     internals

   - mlx5: more accurate port TX timestamping support

   - mlxsw:
      - improve the efficiency of offloaded next hop updates by using
        the new nexthop object API
      - support blackhole nexthops
      - support IEEE 802.1ad (Q-in-Q) bridging

   - rtw88: major bluetooth co-existance improvements

   - iwlwifi: support new 6 GHz frequency band

   - ath11k: Fast Initial Link Setup (FILS)

   - mt7915: dual band concurrent (DBDC) support

   - net: ipa: add basic support for IPA v4.5

  Refactor:

   - a few pieces of in_interrupt() cleanup work from Sebastian Andrzej
     Siewior

   - phy: add support for shared interrupts; get rid of multiple driver
     APIs and have the drivers write a full IRQ handler, slight growth
     of driver code should be compensated by the simpler API which also
     allows shared IRQs

   - add common code for handling netdev per-cpu counters

   - move TX packet re-allocation from Ethernet switch tag drivers to a
     central place

   - improve efficiency and rename nla_strlcpy

   - number of W=1 warning cleanups as we now catch those in a patchwork
     build bot

  Old code removal:

   - wan: delete the DLCI / SDLA drivers

   - wimax: move to staging

   - wifi: remove old WDS wifi bridging support"

* tag 'net-next-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1922 commits)
  net: hns3: fix expression that is currently always true
  net: fix proc_fs init handling in af_packet and tls
  nfc: pn533: convert comma to semicolon
  af_vsock: Assign the vsock transport considering the vsock address flags
  af_vsock: Set VMADDR_FLAG_TO_HOST flag on the receive path
  vsock_addr: Check for supported flag values
  vm_sockets: Add VMADDR_FLAG_TO_HOST vsock flag
  vm_sockets: Add flags field in the vsock address data structure
  net: Disable NETIF_F_HW_TLS_TX when HW_CSUM is disabled
  tcp: Add logic to check for SYN w/ data in tcp_simple_retransmit
  net: mscc: ocelot: install MAC addresses in .ndo_set_rx_mode from process context
  nfc: s3fwrn5: Release the nfc firmware
  net: vxget: clean up sparse warnings
  mlxsw: spectrum_router: Use eXtended mezzanine to offload IPv4 router
  mlxsw: spectrum: Set KVH XLT cache mode for Spectrum2/3
  mlxsw: spectrum_router_xm: Introduce basic XM cache flushing
  mlxsw: reg: Add Router LPM Cache Enable Register
  mlxsw: reg: Add Router LPM Cache ML Delete Register
  mlxsw: spectrum_router_xm: Implement L-value tracking for M-index
  mlxsw: reg: Add XM Router M Table Register
  ...

10 files changed, 48 insertions, 9 deletions

diff --git a/net/dccp/ackvec.c b/net/dccp/ackvec.c
index 8f3dd3b1d2d0..c4bbac99740d 100644
--- a/net/dccp/ackvec.c
+++ b/net/dccp/ackvec.c
@@ -242,6 +242,8 @@ static void dccp_ackvec_add_new(struct dccp_ackvec *av, u32 num_packets,
 
 /**
  * dccp_ackvec_input  -  Register incoming packet in the buffer
+ * @av: Ack Vector to register packet to
+ * @skb: Packet to register
  */
 void dccp_ackvec_input(struct dccp_ackvec *av, struct sk_buff *skb)
 {
@@ -273,6 +275,9 @@ void dccp_ackvec_input(struct dccp_ackvec *av, struct sk_buff *skb)
 
 /**
  * dccp_ackvec_clear_state  -  Perform house-keeping / garbage-collection
+ * @av: Ack Vector record to clean
+ * @ackno: last Ack Vector which has been acknowledged
+ *
  * This routine is called when the peer acknowledges the receipt of Ack Vectors
  * up to and including @ackno. While based on section A.3 of RFC 4340, here
  * are additional precautions to prevent corrupted buffer state. In particular,
diff --git a/net/dccp/ccid.c b/net/dccp/ccid.c
index 1e9bb121ba72..6beac5d348e2 100644
--- a/net/dccp/ccid.c
+++ b/net/dccp/ccid.c
@@ -76,7 +76,7 @@ int ccid_getsockopt_builtin_ccids(struct sock *sk, int len,
 	return err;
 }
 
-static struct kmem_cache *ccid_kmem_cache_create(int obj_size, char *slab_name_fmt, const char *fmt,...)
+static __printf(3, 4) struct kmem_cache *ccid_kmem_cache_create(int obj_size, char *slab_name_fmt, const char *fmt,...)
 {
 	struct kmem_cache *slab;
 	va_list args;
diff --git a/net/dccp/ccids/ccid2.c b/net/dccp/ccids/ccid2.c
index 3da1f77bd039..4d9823d6dced 100644
--- a/net/dccp/ccids/ccid2.c
+++ b/net/dccp/ccids/ccid2.c
@@ -181,6 +181,9 @@ MODULE_PARM_DESC(ccid2_do_cwv, "Perform RFC2861 Congestion Window Validation");
 
 /**
  * ccid2_update_used_window  -  Track how much of cwnd is actually used
+ * @hc: socket to update window
+ * @new_wnd: new window values to add into the filter
+ *
  * This is done in addition to CWV. The sender needs to have an idea of how many
  * packets may be in flight, to set the local Sequence Window value accordingly
  * (RFC 4340, 7.5.2). The CWV mechanism is exploited to keep track of the
@@ -349,6 +352,8 @@ static void ccid2_hc_tx_packet_sent(struct sock *sk, unsigned int len)
 
 /**
  * ccid2_rtt_estimator - Sample RTT and compute RTO using RFC2988 algorithm
+ * @sk: socket to perform estimator on
+ *
  * This code is almost identical with TCP's tcp_rtt_estimator(), since
  * - it has a higher sampling frequency (recommended by RFC 1323),
  * - the RTO does not collapse into RTT due to RTTVAR going towards zero,
diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
index b9ee1a4a8955..ca8670f78ac6 100644
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -79,6 +79,8 @@ static inline u64 rfc3390_initial_rate(struct sock *sk)
 
 /**
  * ccid3_update_send_interval  -  Calculate new t_ipi = s / X_inst
+ * @hc: socket to have the send interval updated
+ *
  * This respects the granularity of X_inst (64 * bytes/second).
  */
 static void ccid3_update_send_interval(struct ccid3_hc_tx_sock *hc)
@@ -99,6 +101,7 @@ static u32 ccid3_hc_tx_idle_rtt(struct ccid3_hc_tx_sock *hc, ktime_t now)
 
 /**
  * ccid3_hc_tx_update_x  -  Update allowed sending rate X
+ * @sk: socket to be updated
  * @stamp: most recent time if available - can be left NULL.
  *
  * This function tracks draft rfc3448bis, check there for latest details.
@@ -151,6 +154,7 @@ static void ccid3_hc_tx_update_x(struct sock *sk, ktime_t *stamp)
 
 /**
  *	ccid3_hc_tx_update_s - Track the mean packet size `s'
+ *	@hc: socket to be updated
  *	@len: DCCP packet payload size in bytes
  *
  *	cf. RFC 4342, 5.3 and  RFC 3448, 4.1
@@ -259,6 +263,7 @@ out:
 
 /**
  * ccid3_hc_tx_send_packet  -  Delay-based dequeueing of TX packets
+ * @sk: socket to send packet from
  * @skb: next packet candidate to send on @sk
  *
  * This function uses the convention of ccid_packet_dequeue_eval() and
@@ -655,6 +660,7 @@ static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb)
 
 /**
  * ccid3_first_li  -  Implements [RFC 5348, 6.3.1]
+ * @sk: socket to calculate loss interval for
  *
  * Determine the length of the first loss interval via inverse lookup.
  * Assume that X_recv can be computed by the throughput equation
diff --git a/net/dccp/ccids/lib/loss_interval.c b/net/dccp/ccids/lib/loss_interval.c
index 67abad695e66..da95319842bb 100644
--- a/net/dccp/ccids/lib/loss_interval.c
+++ b/net/dccp/ccids/lib/loss_interval.c
@@ -79,6 +79,9 @@ static void tfrc_lh_calc_i_mean(struct tfrc_loss_hist *lh)
 
 /**
  * tfrc_lh_update_i_mean  -  Update the `open' loss interval I_0
+ * @lh: histogram to update
+ * @skb: received socket triggering loss interval update
+ *
  * For recomputing p: returns `true' if p > p_prev  <=>  1/p < 1/p_prev
  */
 u8 tfrc_lh_update_i_mean(struct tfrc_loss_hist *lh, struct sk_buff *skb)
diff --git a/net/dccp/ccids/lib/packet_history.c b/net/dccp/ccids/lib/packet_history.c
index af08e2df7108..0cdda3c66fb5 100644
--- a/net/dccp/ccids/lib/packet_history.c
+++ b/net/dccp/ccids/lib/packet_history.c
@@ -385,6 +385,9 @@ static inline struct tfrc_rx_hist_entry *
 
 /**
  * tfrc_rx_hist_sample_rtt  -  Sample RTT from timestamp / CCVal
+ * @h: receive histogram
+ * @skb: packet containing timestamp.
+ *
  * Based on ideas presented in RFC 4342, 8.1. Returns 0 if it was not able
  * to compute a sample with given data - calling function should check this.
  */
diff --git a/net/dccp/feat.c b/net/dccp/feat.c
index 788dd629c420..305f56804832 100644
--- a/net/dccp/feat.c
+++ b/net/dccp/feat.c
@@ -996,6 +996,8 @@ int dccp_feat_finalise_settings(struct dccp_sock *dp)
 
 /**
  * dccp_feat_server_ccid_dependencies  -  Resolve CCID-dependent features
+ * @dreq: server socket to resolve
+ *
  * It is the server which resolves the dependencies once the CCID has been
  * fully negotiated. If no CCID has been negotiated, it uses the default CCID.
  */
@@ -1033,6 +1035,10 @@ static int dccp_feat_preflist_match(u8 *servlist, u8 slen, u8 *clilist, u8 clen)
 
 /**
  * dccp_feat_prefer  -  Move preferred entry to the start of array
+ * @preferred_value: entry to move to start of array
+ * @array: array of preferred entries
+ * @array_len: size of the array
+ *
  * Reorder the @array_len elements in @array so that @preferred_value comes
  * first. Returns >0 to indicate that @preferred_value does occur in @array.
  */
diff --git a/net/dccp/output.c b/net/dccp/output.c
index 50e6d5699bb2..b8a24734385e 100644
--- a/net/dccp/output.c
+++ b/net/dccp/output.c
@@ -143,6 +143,8 @@ static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
 
 /**
  * dccp_determine_ccmps  -  Find out about CCID-specific packet-size limits
+ * @dp: socket to find packet size limits of
+ *
  * We only consider the HC-sender CCID for setting the CCMPS (RFC 4340, 14.),
  * since the RX CCID is restricted to feedback packets (Acks), which are small
  * in comparison with the data traffic. A value of 0 means "no current CCMPS".
@@ -236,6 +238,8 @@ static int dccp_wait_for_ccid(struct sock *sk, unsigned long delay)
 
 /**
  * dccp_xmit_packet  -  Send data packet under control of CCID
+ * @sk: socket to send data packet on
+ *
  * Transmits next-queued payload and informs CCID to account for the packet.
  */
 static void dccp_xmit_packet(struct sock *sk)
@@ -296,6 +300,9 @@ static void dccp_xmit_packet(struct sock *sk)
 
 /**
  * dccp_flush_write_queue  -  Drain queue at end of connection
+ * @sk: socket to be drained
+ * @time_budget: time allowed to drain the queue
+ *
  * Since dccp_sendmsg queues packets without waiting for them to be sent, it may
  * happen that the TX queue is not empty at the end of a connection. We give the
  * HC-sender CCID a grace period of up to @time_budget jiffies. If this function
@@ -367,6 +374,8 @@ void dccp_write_xmit(struct sock *sk)
 
 /**
  * dccp_retransmit_skb  -  Retransmit Request, Close, or CloseReq packets
+ * @sk: socket to perform retransmit on
+ *
  * There are only four retransmittable packet types in DCCP:
  * - Request  in client-REQUEST  state (sec. 8.1.1),
  * - CloseReq in server-CLOSEREQ state (sec. 8.3),
diff --git a/net/dccp/qpolicy.c b/net/dccp/qpolicy.c
index db2448c33a62..5ba204ec0aca 100644
--- a/net/dccp/qpolicy.c
+++ b/net/dccp/qpolicy.c
@@ -65,14 +65,16 @@ static bool qpolicy_prio_full(struct sock *sk)
  * @push: add a new @skb to the write queue
  * @full: indicates that no more packets will be admitted
  * @top:  peeks at whatever the queueing policy defines as its `top'
+ * @params: parameter passed to policy operation
  */
-static struct dccp_qpolicy_operations {
+struct dccp_qpolicy_operations {
 	void		(*push)	(struct sock *sk, struct sk_buff *skb);
 	bool		(*full) (struct sock *sk);
 	struct sk_buff*	(*top)  (struct sock *sk);
 	__be32		params;
+};
 
-} qpol_table[DCCPQ_POLICY_MAX] = {
+static struct dccp_qpolicy_operations qpol_table[DCCPQ_POLICY_MAX] = {
 	[DCCPQ_POLICY_SIMPLE] = {
 		.push   = qpolicy_simple_push,
 		.full   = qpolicy_simple_full,
diff --git a/net/dccp/timer.c b/net/dccp/timer.c
index a934d2932373..db768f223ef7 100644
--- a/net/dccp/timer.c
+++ b/net/dccp/timer.c
@@ -215,13 +215,14 @@ out:
 
 /**
  * dccp_write_xmitlet  -  Workhorse for CCID packet dequeueing interface
- * @data: Socket to act on
+ * @t: pointer to the tasklet associated with this handler
  *
  * See the comments above %ccid_dequeueing_decision for supported modes.
  */
-static void dccp_write_xmitlet(unsigned long data)
+static void dccp_write_xmitlet(struct tasklet_struct *t)
 {
-	struct sock *sk = (struct sock *)data;
+	struct dccp_sock *dp = from_tasklet(dp, t, dccps_xmitlet);
+	struct sock *sk = &dp->dccps_inet_connection.icsk_inet.sk;
 
 	bh_lock_sock(sk);
 	if (sock_owned_by_user(sk))
@@ -235,16 +236,15 @@ static void dccp_write_xmitlet(unsigned long data)
 static void dccp_write_xmit_timer(struct timer_list *t)
 {
 	struct dccp_sock *dp = from_timer(dp, t, dccps_xmit_timer);
-	struct sock *sk = &dp->dccps_inet_connection.icsk_inet.sk;
 
-	dccp_write_xmitlet((unsigned long)sk);
+	dccp_write_xmitlet(&dp->dccps_xmitlet);
 }
 
 void dccp_init_xmit_timers(struct sock *sk)
 {
 	struct dccp_sock *dp = dccp_sk(sk);
 
-	tasklet_init(&dp->dccps_xmitlet, dccp_write_xmitlet, (unsigned long)sk);
+	tasklet_setup(&dp->dccps_xmitlet, dccp_write_xmitlet);
 	timer_setup(&dp->dccps_xmit_timer, dccp_write_xmit_timer, 0);
 	inet_csk_init_xmit_timers(sk, &dccp_write_timer, &dccp_delack_timer,
 				  &dccp_keepalive_timer);