Merge tag 'net-next-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextHEADmaster

Pull networking updates from Paolo Abeni:
 "The most significant set of changes is the per netns RTNL. The new
  behavior is disabled by default, regression risk should be contained.

  Notably the new config knob PTP_1588_CLOCK_VMCLOCK will inherit its
  default value from PTP_1588_CLOCK_KVM, as the first is intended to be
  a more reliable replacement for the latter.

  Core:

   - Started a very large, in-progress, effort to make the RTNL lock
     scope per network-namespace, thus reducing the lock contention
     significantly in the containerized use-case, comprising:
       - RCU-ified some relevant slices of the FIB control path
       - introduce basic per netns locking helpers
       - namespacified the IPv4 address hash table
       - remove rtnl_register{,_module}() in favour of
         rtnl_register_many()
       - refactor rtnl_{new,del,set}link() moving as much validation as
         possible out of RTNL lock
       - convert all phonet doit() and dumpit() handlers to RCU
       - convert IPv4 addresses manipulation to per-netns RTNL
       - convert virtual interface creation to per-netns RTNL
     the per-netns lock infrastructure is guarded by the
     CONFIG_DEBUG_NET_SMALL_RTNL knob, disabled by default ad interim.

   - Introduce NAPI suspension, to efficiently switching between busy
     polling (NAPI processing suspended) and normal processing.

   - Migrate the IPv4 routing input, output and control path from direct
     ToS usage to DSCP macros. This is a work in progress to make ECN
     handling consistent and reliable.

   - Add drop reasons support to the IPv4 rotue input path, allowing
     better introspection in case of packets drop.

   - Make FIB seqnum lockless, dropping RTNL protection for read access.

   - Make inet{,v6} addresses hashing less predicable.

   - Allow providing timestamp OPT_ID via cmsg, to correlate TX packets
     and timestamps

  Things we sprinkled into general kernel code:

   - Add small file operations for debugfs, to reduce the struct ops
     size.

   - Refactoring and optimization for the implementation of page_frag
     API, This is a preparatory work to consolidate the page_frag
     implementation.

  Netfilter:

   - Optimize set element transactions to reduce memory consumption

   - Extended netlink error reporting for attribute parser failure.

   - Make legacy xtables configs user selectable, giving users the
     option to configure iptables without enabling any other config.

   - Address a lot of false-positive RCU issues, pointed by recent CI
     improvements.

  BPF:

   - Put xsk sockets on a struct diet and add various cleanups. Overall,
     this helps to bump performance by 12% for some workloads.

   - Extend BPF selftests to increase coverage of XDP features in
     combination with BPF cpumap.

   - Optimize and homogenize bpf_csum_diff helper for all archs and also
     add a batch of new BPF selftests for it.

   - Extend netkit with an option to delegate skb->{mark,priority}
     scrubbing to its BPF program.

   - Make the bpf_get_netns_cookie() helper available also to tc(x) BPF
     programs.

  Protocols:

   - Introduces 4-tuple hash for connected udp sockets, speeding-up
     significantly connected sockets lookup.

   - Add a fastpath for some TCP timers that usually expires after
     close, the socket lock contention.

   - Add inbound and outbound xfrm state caches to speed up state
     lookups.

   - Avoid sending MPTCP advertisements on stale subflows, reducing
     risks on loosing them.

   - Make neighbours table flushing more scalable, maintaining per
     device neigh lists.

  Driver API:

   - Introduce a unified interface to configure transmission H/W
     shaping, and expose it to user-space via generic-netlink.

   - Add support for per-NAPI config via netlink. This makes napi
     configuration persistent across queues removal and re-creation.
     Requires driver updates, currently supported drivers are:
     nVidia/Mellanox mlx4 and mlx5, Broadcom brcm and Intel ice.

   - Add ethtool support for writing SFP / PHY firmware blocks.

   - Track RSS context allocation from ethtool core.

   - Implement support for mirroring to DSA CPU port, via TC mirror
     offload.

   - Consolidate FDB updates notification, to avoid duplicates on
     device-specific entries.

   - Expose DPLL clock quality level to the user-space.

   - Support master-slave PHY config via device tree.

  Tests and tooling:

   - forwarding: introduce deferred commands, to simplify the cleanup
     phase

  Drivers:

   - Updated several drivers - Amazon vNic, Google vNic, Microsoft vNic,
     Intel e1000e and Broadcom Tigon3 - to use netdev-genl to link the
     IRQs and queues to NAPI IDs, allowing busy polling and better
     introspection.

   - Ethernet high-speed NICs:
      - nVidia/Mellanox:
         - mlx5:
           - a large refactor to implement support for cross E-Switch
             scheduling
           - refactor H/W conter management to let it scale better
           - H/W GRO cleanups
      - Intel (100G, ice)::
         - add support for ethtool reset
         - implement support for per TX queue H/W shaping
      - AMD/Solarflare:
         - implement per device queue stats support
      - Broadcom (bnxt):
         - improve wildcard l4proto on IPv4/IPv6 ntuple rules
      - Marvell Octeon:
         - Add representor support for each Resource Virtualization Unit
           (RVU) device.
      - Hisilicon:
         - add support for the BMC Gigabit Ethernet
      - IBM (EMAC):
         - driver cleanup and modernization
      - Cisco (VIC):
         - raise the queues number limit to 256

   - Ethernet virtual:
      - Google vNIC:
         - implement page pool support
      - macsec:
         - inherit lower device's features and TSO limits when
           offloading
      - virtio_net:
         - enable premapped mode by default
         - support for XDP socket(AF_XDP) zerocopy TX
      - wireguard:
         - set the TSO max size to be GSO_MAX_SIZE, to aggregate larger
           packets.

   - Ethernet NICs embedded and virtual:
      - Broadcom ASP:
         - enable software timestamping
      - Freescale:
         - add enetc4 PF driver
      - MediaTek: Airoha SoC:
         - implement BQL support
      - RealTek r8169:
         - enable TSO by default on r8168/r8125
         - implement extended ethtool stats
      - Renesas AVB:
         - enable TX checksum offload
      - Synopsys (stmmac):
         - support header splitting for vlan tagged packets
         - move common code for DWMAC4 and DWXGMAC into a separate FPE
           module.
         - add dwmac driver support for T-HEAD TH1520 SoC
      - Synopsys (xpcs):
         - driver refactor and cleanup
      - TI:
         - icssg_prueth: add VLAN offload support
      - Xilinx emaclite:
         - add clock support

   - Ethernet switches:
      - Microchip:
         - implement support for the lan969x Ethernet switch family
         - add LAN9646 switch support to KSZ DSA driver

   - Ethernet PHYs:
      - Marvel: 88q2x: enable auto negotiation
      - Microchip: add support for LAN865X Rev B1 and LAN867X Rev C1/C2

   - PTP:
      - Add support for the Amazon virtual clock device
      - Add PtP driver for s390 clocks

   - WiFi:
      - mac80211
         - EHT 1024 aggregation size for transmissions
         - new operation to indicate that a new interface is to be added
         - support radio separation of multi-band devices
         - move wireless extension spy implementation to libiw
      - Broadcom:
         - brcmfmac: optional LPO clock support
      - Microchip:
         - add support for Atmel WILC3000
      - Qualcomm (ath12k):
         - firmware coredump collection support
         - add debugfs support for a multitude of statistics
      - Qualcomm (ath5k):
         -  Arcadyan ARV45XX AR2417 & Gigaset SX76[23] AR241[34]A support
      - Realtek:
         - rtw88: 8821au and 8812au USB adapters support
         - rtw89: add thermal protection
         - rtw89: fine tune BT-coexsitence to improve user experience
         - rtw89: firmware secure boot for WiFi 6 chip

   - Bluetooth
      - add Qualcomm WCN785x support for ids Foxconn 0xe0fc/0xe0f3 and
        0x13d3:0x3623
      - add Realtek RTL8852BE support for id Foxconn 0xe123
      - add MediaTek MT7920 support for wireless module ids
      - btintel_pcie: add handshake between driver and firmware
      - btintel_pcie: add recovery mechanism
      - btnxpuart: add GPIO support to power save feature"

* tag 'net-next-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1475 commits)
  mm: page_frag: fix a compile error when kernel is not compiled
  Documentation: tipc: fix formatting issue in tipc.rst
  selftests: nic_performance: Add selftest for performance of NIC driver
  selftests: nic_link_layer: Add selftest case for speed and duplex states
  selftests: nic_link_layer: Add link layer selftest for NIC driver
  bnxt_en: Add FW trace coredump segments to the coredump
  bnxt_en: Add a new ethtool -W dump flag
  bnxt_en: Add 2 parameters to bnxt_fill_coredump_seg_hdr()
  bnxt_en: Add functions to copy host context memory
  bnxt_en: Do not free FW log context memory
  bnxt_en: Manage the FW trace context memory
  bnxt_en: Allocate backing store memory for FW trace logs
  bnxt_en: Add a 'force' parameter to bnxt_free_ctx_mem()
  bnxt_en: Refactor bnxt_free_ctx_mem()
  bnxt_en: Add mem_valid bit to struct bnxt_ctx_mem_type
  bnxt_en: Update firmware interface spec to 1.10.3.85
  selftests/bpf: Add some tests with sockmap SK_PASS
  bpf: fix recursive lock when verdict program return SK_PASS
  wireguard: device: support big tcp GSO
  wireguard: selftests: load nf_conntrack if not present
  ...

4 files changed, 136 insertions, 69 deletions

diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index 67299e8b734e..47dc96dfe386 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -100,8 +100,16 @@ int debugfs_file_get(struct dentry *dentry)
 		if (!fsd)
 			return -ENOMEM;
 
-		fsd->real_fops = (void *)((unsigned long)d_fsd &
-					~DEBUGFS_FSDATA_IS_REAL_FOPS_BIT);
+		if ((unsigned long)d_fsd & DEBUGFS_FSDATA_IS_SHORT_FOPS_BIT) {
+			fsd->real_fops = NULL;
+			fsd->short_fops = (void *)((unsigned long)d_fsd &
+						~(DEBUGFS_FSDATA_IS_REAL_FOPS_BIT |
+						  DEBUGFS_FSDATA_IS_SHORT_FOPS_BIT));
+		} else {
+			fsd->real_fops = (void *)((unsigned long)d_fsd &
+						~DEBUGFS_FSDATA_IS_REAL_FOPS_BIT);
+			fsd->short_fops = NULL;
+		}
 		refcount_set(&fsd->active_users, 1);
 		init_completion(&fsd->active_users_drained);
 		INIT_LIST_HEAD(&fsd->cancellations);
@@ -241,9 +249,10 @@ static int debugfs_locked_down(struct inode *inode,
 {
 	if ((inode->i_mode & 07777 & ~0444) == 0 &&
 	    !(filp->f_mode & FMODE_WRITE) &&
-	    !real_fops->unlocked_ioctl &&
-	    !real_fops->compat_ioctl &&
-	    !real_fops->mmap)
+	    (!real_fops ||
+	     (!real_fops->unlocked_ioctl &&
+	      !real_fops->compat_ioctl &&
+	      !real_fops->mmap)))
 		return 0;
 
 	if (security_locked_down(LOCKDOWN_DEBUGFS))
@@ -316,19 +325,38 @@ static ret_type full_proxy_ ## name(proto)				\
 	return r;							\
 }
 
-FULL_PROXY_FUNC(llseek, loff_t, filp,
-		PROTO(struct file *filp, loff_t offset, int whence),
-		ARGS(filp, offset, whence));
+#define FULL_PROXY_FUNC_BOTH(name, ret_type, filp, proto, args)		\
+static ret_type full_proxy_ ## name(proto)				\
+{									\
+	struct dentry *dentry = F_DENTRY(filp);				\
+	struct debugfs_fsdata *fsd;					\
+	ret_type r;							\
+									\
+	r = debugfs_file_get(dentry);					\
+	if (unlikely(r))						\
+		return r;						\
+	fsd = dentry->d_fsdata;						\
+	if (fsd->real_fops)						\
+		r = fsd->real_fops->name(args);				\
+	else								\
+		r = fsd->short_fops->name(args);			\
+	debugfs_file_put(dentry);					\
+	return r;							\
+}
+
+FULL_PROXY_FUNC_BOTH(llseek, loff_t, filp,
+		     PROTO(struct file *filp, loff_t offset, int whence),
+		     ARGS(filp, offset, whence));
 
-FULL_PROXY_FUNC(read, ssize_t, filp,
-		PROTO(struct file *filp, char __user *buf, size_t size,
-			loff_t *ppos),
-		ARGS(filp, buf, size, ppos));
+FULL_PROXY_FUNC_BOTH(read, ssize_t, filp,
+		     PROTO(struct file *filp, char __user *buf, size_t size,
+			   loff_t *ppos),
+		     ARGS(filp, buf, size, ppos));
 
-FULL_PROXY_FUNC(write, ssize_t, filp,
-		PROTO(struct file *filp, const char __user *buf, size_t size,
-			loff_t *ppos),
-		ARGS(filp, buf, size, ppos));
+FULL_PROXY_FUNC_BOTH(write, ssize_t, filp,
+		     PROTO(struct file *filp, const char __user *buf,
+			   size_t size, loff_t *ppos),
+		     ARGS(filp, buf, size, ppos));
 
 FULL_PROXY_FUNC(unlocked_ioctl, long, filp,
 		PROTO(struct file *filp, unsigned int cmd, unsigned long arg),
@@ -363,7 +391,7 @@ static int full_proxy_release(struct inode *inode, struct file *filp)
 	 * not to leak any resources. Releasers must not assume that
 	 * ->i_private is still being meaningful here.
 	 */
-	if (real_fops->release)
+	if (real_fops && real_fops->release)
 		r = real_fops->release(inode, filp);
 
 	replace_fops(filp, d_inode(dentry)->i_fop);
@@ -373,39 +401,48 @@ static int full_proxy_release(struct inode *inode, struct file *filp)
 }
 
 static void __full_proxy_fops_init(struct file_operations *proxy_fops,
-				const struct file_operations *real_fops)
+				   struct debugfs_fsdata *fsd)
 {
 	proxy_fops->release = full_proxy_release;
-	if (real_fops->llseek)
+
+	if ((fsd->real_fops && fsd->real_fops->llseek) ||
+	    (fsd->short_fops && fsd->short_fops->llseek))
 		proxy_fops->llseek = full_proxy_llseek;
-	if (real_fops->read)
+
+	if ((fsd->real_fops && fsd->real_fops->read) ||
+	    (fsd->short_fops && fsd->short_fops->read))
 		proxy_fops->read = full_proxy_read;
-	if (real_fops->write)
+
+	if ((fsd->real_fops && fsd->real_fops->write) ||
+	    (fsd->short_fops && fsd->short_fops->write))
 		proxy_fops->write = full_proxy_write;
-	if (real_fops->poll)
+
+	if (fsd->real_fops && fsd->real_fops->poll)
 		proxy_fops->poll = full_proxy_poll;
-	if (real_fops->unlocked_ioctl)
+
+	if (fsd->real_fops && fsd->real_fops->unlocked_ioctl)
 		proxy_fops->unlocked_ioctl = full_proxy_unlocked_ioctl;
 }
 
 static int full_proxy_open(struct inode *inode, struct file *filp)
 {
 	struct dentry *dentry = F_DENTRY(filp);
-	const struct file_operations *real_fops = NULL;
+	const struct file_operations *real_fops;
 	struct file_operations *proxy_fops = NULL;
+	struct debugfs_fsdata *fsd;
 	int r;
 
 	r = debugfs_file_get(dentry);
 	if (r)
 		return r == -EIO ? -ENOENT : r;
 
-	real_fops = debugfs_real_fops(filp);
-
+	fsd = dentry->d_fsdata;
+	real_fops = fsd->real_fops;
 	r = debugfs_locked_down(inode, filp, real_fops);
 	if (r)
 		goto out;
 
-	if (!fops_get(real_fops)) {
+	if (real_fops && !fops_get(real_fops)) {
 #ifdef CONFIG_MODULES
 		if (real_fops->owner &&
 		    real_fops->owner->state == MODULE_STATE_GOING) {
@@ -426,11 +463,14 @@ static int full_proxy_open(struct inode *inode, struct file *filp)
 		r = -ENOMEM;
 		goto free_proxy;
 	}
-	__full_proxy_fops_init(proxy_fops, real_fops);
+	__full_proxy_fops_init(proxy_fops, fsd);
 	replace_fops(filp, proxy_fops);
 
-	if (real_fops->open) {
-		r = real_fops->open(inode, filp);
+	if (!real_fops || real_fops->open) {
+		if (real_fops)
+			r = real_fops->open(inode, filp);
+		else
+			r = simple_open(inode, filp);
 		if (r) {
 			replace_fops(filp, d_inode(dentry)->i_fop);
 			goto free_proxy;
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index 66d9b3b4c588..38a9c7eb97e6 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -412,7 +412,7 @@ static struct dentry *end_creating(struct dentry *dentry)
 static struct dentry *__debugfs_create_file(const char *name, umode_t mode,
 				struct dentry *parent, void *data,
 				const struct file_operations *proxy_fops,
-				const struct file_operations *real_fops)
+				const void *real_fops)
 {
 	struct dentry *dentry;
 	struct inode *inode;
@@ -450,49 +450,38 @@ static struct dentry *__debugfs_create_file(const char *name, umode_t mode,
 	return end_creating(dentry);
 }
 
-/**
- * debugfs_create_file - create a file in the debugfs filesystem
- * @name: a pointer to a string containing the name of the file to create.
- * @mode: the permission that the file should have.
- * @parent: a pointer to the parent dentry for this file.  This should be a
- *          directory dentry if set.  If this parameter is NULL, then the
- *          file will be created in the root of the debugfs filesystem.
- * @data: a pointer to something that the caller will want to get to later
- *        on.  The inode.i_private pointer will point to this value on
- *        the open() call.
- * @fops: a pointer to a struct file_operations that should be used for
- *        this file.
- *
- * This is the basic "create a file" function for debugfs.  It allows for a
- * wide range of flexibility in creating a file, or a directory (if you want
- * to create a directory, the debugfs_create_dir() function is
- * recommended to be used instead.)
- *
- * This function will return a pointer to a dentry if it succeeds.  This
- * pointer must be passed to the debugfs_remove() function when the file is
- * to be removed (no automatic cleanup happens if your module is unloaded,
- * you are responsible here.)  If an error occurs, ERR_PTR(-ERROR) will be
- * returned.
- *
- * If debugfs is not enabled in the kernel, the value -%ENODEV will be
- * returned.
- *
- * NOTE: it's expected that most callers should _ignore_ the errors returned
- * by this function. Other debugfs functions handle the fact that the "dentry"
- * passed to them could be an error and they don't crash in that case.
- * Drivers should generally work fine even if debugfs fails to init anyway.
- */
-struct dentry *debugfs_create_file(const char *name, umode_t mode,
-				   struct dentry *parent, void *data,
-				   const struct file_operations *fops)
+struct dentry *debugfs_create_file_full(const char *name, umode_t mode,
+					struct dentry *parent, void *data,
+					const struct file_operations *fops)
 {
+	if (WARN_ON((unsigned long)fops &
+		    (DEBUGFS_FSDATA_IS_SHORT_FOPS_BIT |
+		     DEBUGFS_FSDATA_IS_REAL_FOPS_BIT)))
+		return ERR_PTR(-EINVAL);
 
 	return __debugfs_create_file(name, mode, parent, data,
 				fops ? &debugfs_full_proxy_file_operations :
 					&debugfs_noop_file_operations,
 				fops);
 }
-EXPORT_SYMBOL_GPL(debugfs_create_file);
+EXPORT_SYMBOL_GPL(debugfs_create_file_full);
+
+struct dentry *debugfs_create_file_short(const char *name, umode_t mode,
+					 struct dentry *parent, void *data,
+					 const struct debugfs_short_fops *fops)
+{
+	if (WARN_ON((unsigned long)fops &
+		    (DEBUGFS_FSDATA_IS_SHORT_FOPS_BIT |
+		     DEBUGFS_FSDATA_IS_REAL_FOPS_BIT)))
+		return ERR_PTR(-EINVAL);
+
+	return __debugfs_create_file(name, mode, parent, data,
+				fops ? &debugfs_full_proxy_file_operations :
+					&debugfs_noop_file_operations,
+				(const void *)((unsigned long)fops |
+					       DEBUGFS_FSDATA_IS_SHORT_FOPS_BIT));
+}
+EXPORT_SYMBOL_GPL(debugfs_create_file_short);
 
 /**
  * debugfs_create_file_unsafe - create a file in the debugfs filesystem
diff --git a/fs/debugfs/internal.h b/fs/debugfs/internal.h
index dae80c2a469e..a3edfa4f0d8e 100644
--- a/fs/debugfs/internal.h
+++ b/fs/debugfs/internal.h
@@ -18,6 +18,7 @@ extern const struct file_operations debugfs_full_proxy_file_operations;
 
 struct debugfs_fsdata {
 	const struct file_operations *real_fops;
+	const struct debugfs_short_fops *short_fops;
 	union {
 		/* automount_fn is used when real_fops is NULL */
 		debugfs_automount_t automount;
@@ -39,6 +40,11 @@ struct debugfs_fsdata {
  * pointer gets its lowest bit set.
  */
 #define DEBUGFS_FSDATA_IS_REAL_FOPS_BIT BIT(0)
+/*
+ * A dentry's ->d_fsdata, when pointing to real fops, is with
+ * short fops instead of full fops.
+ */
+#define DEBUGFS_FSDATA_IS_SHORT_FOPS_BIT BIT(1)
 
 /* Access BITS */
 #define DEBUGFS_ALLOW_API	BIT(0)
diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 62433cb3d2c2..f9898e60dd8b 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -420,7 +420,9 @@ static bool busy_loop_ep_timeout(unsigned long start_time,
 
 static bool ep_busy_loop_on(struct eventpoll *ep)
 {
-	return !!READ_ONCE(ep->busy_poll_usecs) || net_busy_loop_on();
+	return !!READ_ONCE(ep->busy_poll_usecs) ||
+	       READ_ONCE(ep->prefer_busy_poll) ||
+	       net_busy_loop_on();
 }
 
 static bool ep_busy_loop_end(void *p, unsigned long start_time)
@@ -455,6 +457,8 @@ static bool ep_busy_loop(struct eventpoll *ep, int nonblock)
 		 * it back in when we have moved a socket with a valid NAPI
 		 * ID onto the ready list.
 		 */
+		if (prefer_busy_poll)
+			napi_resume_irqs(napi_id);
 		ep->napi_id = 0;
 		return false;
 	}
@@ -538,6 +542,22 @@ static long ep_eventpoll_bp_ioctl(struct file *file, unsigned int cmd,
 	}
 }
 
+static void ep_suspend_napi_irqs(struct eventpoll *ep)
+{
+	unsigned int napi_id = READ_ONCE(ep->napi_id);
+
+	if (napi_id >= MIN_NAPI_ID && READ_ONCE(ep->prefer_busy_poll))
+		napi_suspend_irqs(napi_id);
+}
+
+static void ep_resume_napi_irqs(struct eventpoll *ep)
+{
+	unsigned int napi_id = READ_ONCE(ep->napi_id);
+
+	if (napi_id >= MIN_NAPI_ID && READ_ONCE(ep->prefer_busy_poll))
+		napi_resume_irqs(napi_id);
+}
+
 #else
 
 static inline bool ep_busy_loop(struct eventpoll *ep, int nonblock)
@@ -555,6 +575,14 @@ static long ep_eventpoll_bp_ioctl(struct file *file, unsigned int cmd,
 	return -EOPNOTSUPP;
 }
 
+static void ep_suspend_napi_irqs(struct eventpoll *ep)
+{
+}
+
+static void ep_resume_napi_irqs(struct eventpoll *ep)
+{
+}
+
 #endif /* CONFIG_NET_RX_BUSY_POLL */
 
 /*
@@ -786,6 +814,7 @@ static bool ep_refcount_dec_and_test(struct eventpoll *ep)
 
 static void ep_free(struct eventpoll *ep)
 {
+	ep_resume_napi_irqs(ep);
 	mutex_destroy(&ep->mtx);
 	free_uid(ep->user);
 	wakeup_source_unregister(ep->ws);
@@ -2008,8 +2037,11 @@ static int ep_poll(struct eventpoll *ep, struct epoll_event __user *events,
 			 * trying again in search of more luck.
 			 */
 			res = ep_send_events(ep, events, maxevents);
-			if (res)
+			if (res) {
+				if (res > 0)
+					ep_suspend_napi_irqs(ep);
 				return res;
+			}
 		}
 
 		if (timed_out)