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From: Andreas Hindborg <a.hindborg@kernel.org>
To: "Boqun Feng" <boqun.feng@gmail.com>,
	"Jens Axboe" <axboe@kernel.dk>, "Miguel Ojeda" <ojeda@kernel.org>,
	"Gary Guo" <gary@garyguo.net>,
	"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
	"Benno Lossin" <lossin@kernel.org>,
	"Alice Ryhl" <aliceryhl@google.com>,
	"Trevor Gross" <tmgross@umich.edu>,
	"Danilo Krummrich" <dakr@kernel.org>,
	"FUJITA Tomonori" <fujita.tomonori@gmail.com>,
	"Frederic Weisbecker" <frederic@kernel.org>,
	"Lyude Paul" <lyude@redhat.com>,
	"Thomas Gleixner" <tglx@kernel.org>,
	"Anna-Maria Behnsen" <anna-maria@linutronix.de>,
	"John Stultz" <jstultz@google.com>,
	"Stephen Boyd" <sboyd@kernel.org>,
	"Lorenzo Stoakes" <lorenzo.stoakes@oracle.com>,
	"Liam R. Howlett" <Liam.Howlett@oracle.com>
Cc: linux-block@vger.kernel.org, rust-for-linux@vger.kernel.org,
	 linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	 Andreas Hindborg <a.hindborg@kernel.org>
Subject: [PATCH 66/79] block: rnull: support queue_rqs
Date: Mon, 16 Feb 2026 00:35:53 +0100	[thread overview]
Message-ID: <20260216-rnull-v6-19-rc5-send-v1-66-de9a7af4b469@kernel.org> (raw)
In-Reply-To: <20260216-rnull-v6-19-rc5-send-v1-0-de9a7af4b469@kernel.org>

Implement the `queue_rqs` callback for rnull, allowing the block layer
to submit multiple requests in a single call. This improves performance
by reducing per-request overhead and enabling batch processing.

The implementation processes requests from the list one at a time,
removing successfully processed requests from the list.

Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>
---
 drivers/block/rnull/disk_storage.rs |  34 +++----
 drivers/block/rnull/rnull.rs        | 180 +++++++++++++++++++++++-------------
 2 files changed, 132 insertions(+), 82 deletions(-)

diff --git a/drivers/block/rnull/disk_storage.rs b/drivers/block/rnull/disk_storage.rs
index b2b5eaa783cdc..d9f2703957fc0 100644
--- a/drivers/block/rnull/disk_storage.rs
+++ b/drivers/block/rnull/disk_storage.rs
@@ -86,7 +86,7 @@ pub(crate) fn discard(
         }
     }
 
-    pub(crate) fn flush(&self, hw_data: &Pin<&SpinLock<HwQueueContext>>) -> Result {
+    pub(crate) fn flush(&self, hw_data: &Pin<&SpinLock<HwQueueContext>>) {
         let mut tree_guard = self.lock();
         let mut hw_data_guard = hw_data.lock();
         let mut access = self.access(&mut tree_guard, &mut hw_data_guard, None);
@@ -129,16 +129,10 @@ fn to_sector(index: usize) -> u64 {
         (index << block::PAGE_SECTORS_SHIFT) as u64
     }
 
-    fn extract_cache_page(&mut self) -> Result<Option<KBox<NullBlockPage>>> {
+    fn extract_cache_page(&mut self) -> Option<KBox<NullBlockPage>> {
         let cache_entry = self.cache_guard.find_next_entry_circular(
             self.disk_storage.next_flush_sector.load(ordering::Relaxed) as usize,
-        );
-
-        let cache_entry = if let Some(entry) = cache_entry {
-            entry
-        } else {
-            return Ok(None);
-        };
+        )?;
 
         let index = cache_entry.index();
 
@@ -168,11 +162,14 @@ fn extract_cache_page(&mut self) -> Result<Option<KBox<NullBlockPage>>> {
                     let mut src = cache_entry;
                     let mut offset = 0;
                     for _ in 0..PAGE_SECTORS {
-                        src.page_mut().get_pin_mut().copy_to_page(
-                            disk_entry.page_mut().get_pin_mut(),
-                            offset,
-                            block::SECTOR_SIZE as usize,
-                        )?;
+                        src.page_mut()
+                            .get_pin_mut()
+                            .copy_to_page(
+                                disk_entry.page_mut().get_pin_mut(),
+                                offset,
+                                block::SECTOR_SIZE as usize,
+                            )
+                            .expect("Write to succeed");
                         offset += block::SECTOR_SIZE as usize;
                     }
                     src.remove()
@@ -182,16 +179,15 @@ fn extract_cache_page(&mut self) -> Result<Option<KBox<NullBlockPage>>> {
             }
         };
 
-        Ok(Some(page))
+        Some(page)
     }
 
-    fn flush(&mut self) -> Result {
+    fn flush(&mut self) {
         if self.disk_storage.cache_size > 0 {
-            while let Some(page) = self.extract_cache_page()? {
+            while let Some(page) = self.extract_cache_page() {
                 drop(page);
             }
         }
-        Ok(())
     }
 
     fn get_or_alloc_cache_page(&mut self, sector: u64) -> Result<&mut NullBlockPage> {
@@ -208,7 +204,7 @@ fn get_or_alloc_cache_page(&mut self, sector: u64) -> Result<&mut NullBlockPage>
                     .take()
                     .expect("Expected to have a page available")
             } else {
-                self.extract_cache_page()?
+                self.extract_cache_page()
                     .expect("Expected to find a page in the cache")
             };
             Ok(self
diff --git a/drivers/block/rnull/rnull.rs b/drivers/block/rnull/rnull.rs
index 429819bf042ba..592fbf5790fd2 100644
--- a/drivers/block/rnull/rnull.rs
+++ b/drivers/block/rnull/rnull.rs
@@ -28,7 +28,7 @@
             BadBlocks, //
         },
         bio::Segment,
-        error::BlkResult,
+        error::{BlkError, BlkResult},
         mq::{
             self,
             gen_disk::{
@@ -36,8 +36,10 @@
                 GenDisk,
                 GenDiskRef, //
             },
+            IdleRequest,
             IoCompletionBatch,
             Operations,
+            RequestList,
             TagSet, //
         },
         SECTOR_SHIFT,
@@ -720,6 +722,104 @@ fn complete_request(&self, rq: Owned<mq::Request<Self>>) {
             }
         }
     }
+
+    #[inline(always)]
+    fn queue_rq_internal(
+        hw_data: Pin<&SpinLock<HwQueueContext>>,
+        this: ArcBorrow<'_, Self>,
+        rq: Owned<mq::IdleRequest<Self>>,
+        _is_last: bool,
+    ) -> Result<(), QueueRequestError> {
+        if this.bandwidth_limit != 0 {
+            if !this.bandwidth_timer.active() {
+                drop(this.bandwidth_timer_handle.lock().take());
+                let arc: Arc<_> = this.into();
+                *this.bandwidth_timer_handle.lock() =
+                    Some(arc.start(Self::BANDWIDTH_TIMER_INTERVAL));
+            }
+
+            if this
+                .bandwidth_bytes
+                .fetch_add(u64::from(rq.bytes()), ordering::Relaxed)
+                + u64::from(rq.bytes())
+                > this.bandwidth_limit
+            {
+                rq.queue().stop_hw_queues();
+                if this.bandwidth_bytes.load(ordering::Relaxed) <= this.bandwidth_limit {
+                    rq.queue().start_stopped_hw_queues_async();
+                }
+
+                return Err(QueueRequestError { request: rq });
+            }
+        }
+
+        let mut rq = rq.start();
+
+        if rq.command() == mq::Command::Flush {
+            if this.memory_backed {
+                this.storage.flush(&hw_data);
+            }
+            this.complete_request(rq);
+
+            return Ok(());
+        }
+
+        let status = (|| -> Result {
+            #[cfg(CONFIG_BLK_DEV_ZONED)]
+            if this.zoned.enabled {
+                this.handle_zoned_command(&hw_data, &mut rq)?;
+            } else {
+                this.handle_regular_command(&hw_data, &mut rq)?;
+            }
+
+            #[cfg(not(CONFIG_BLK_DEV_ZONED))]
+            this.handle_regular_command(&hw_data, &mut rq)?;
+
+            Ok(())
+        })();
+
+        if let Err(e) = status {
+            // Do not overwrite existing error. We do not care whether this write fails.
+            let _ = rq
+                .data_ref()
+                .error
+                .cmpxchg(0, e.to_errno(), ordering::Relaxed);
+        }
+
+        if rq.is_poll() {
+            // NOTE: We lack the ability to insert `Owned<Request>` into a
+            // `kernel::list::List`, so we use a `RingBuffer` instead. The
+            // drawback of this is that we have to allocate the space for the
+            // ring buffer during drive initialization, and we have to hold the
+            // lock protecting the list until we have processed all the requests
+            // in the list. Change to a linked list when the kernel gets this
+            // ability.
+
+            // NOTE: We are processing requests during submit rather than during
+            // poll. This is different from C driver. C driver does processing
+            // during poll.
+
+            hw_data
+                .lock()
+                .poll_queue
+                .push_head(rq)
+                .expect("Buffer is sized to hold all in flight requests");
+        } else {
+            this.complete_request(rq);
+        }
+
+        Ok(())
+    }
+}
+
+struct QueueRequestError {
+    request: Owned<IdleRequest<NullBlkDevice>>,
+}
+
+impl From<QueueRequestError> for BlkError {
+    fn from(_value: QueueRequestError) -> Self {
+        kernel::block::error::code::BLK_STS_IOERR
+    }
 }
 
 impl_has_hr_timer! {
@@ -761,7 +861,7 @@ struct HwQueueContext {
 struct Pdu {
     #[pin]
     timer: HrTimer<Self>,
-    error: Atomic<u32>,
+    error: Atomic<i32>,
 }
 
 impl HrTimerCallback for Pdu {
@@ -802,76 +902,31 @@ fn new_request_data() -> impl PinInit<Self::RequestData> {
         })
     }
 
-    #[inline(always)]
     fn queue_rq(
         hw_data: Pin<&SpinLock<HwQueueContext>>,
         this: ArcBorrow<'_, Self>,
         rq: Owned<mq::IdleRequest<Self>>,
-        _is_last: bool,
-        is_poll: bool,
+        is_last: bool,
+        _is_poll: bool,
     ) -> BlkResult {
-        if this.bandwidth_limit != 0 {
-            if !this.bandwidth_timer.active() {
-                drop(this.bandwidth_timer_handle.lock().take());
-                let arc: Arc<_> = this.into();
-                *this.bandwidth_timer_handle.lock() =
-                    Some(arc.start(Self::BANDWIDTH_TIMER_INTERVAL));
-            }
+        Ok(Self::queue_rq_internal(hw_data, this, rq, is_last)?)
+    }
 
-            if this
-                .bandwidth_bytes
-                .fetch_add(u64::from(rq.bytes()), ordering::Relaxed)
-                + u64::from(rq.bytes())
-                > this.bandwidth_limit
+    fn queue_rqs(
+        hw_data: Pin<&SpinLock<HwQueueContext>>,
+        this: ArcBorrow<'_, Self>,
+        requests: &mut RequestList<Self>,
+    ) {
+        let mut requeue = RequestList::new();
+        while let Some(request) = requests.pop() {
+            if let Err(QueueRequestError { request }) =
+                Self::queue_rq_internal(hw_data, this, request, false)
             {
-                rq.queue().stop_hw_queues();
-                if this.bandwidth_bytes.load(ordering::Relaxed) <= this.bandwidth_limit {
-                    rq.queue().start_stopped_hw_queues_async();
-                }
-
-                return Err(kernel::block::error::code::BLK_STS_DEV_RESOURCE);
+                requeue.push_tail(request);
             }
         }
 
-        let mut rq = rq.start();
-
-        if rq.command() == mq::Command::Flush {
-            if this.memory_backed {
-                this.storage.flush(&hw_data)?;
-            }
-            this.complete_request(rq);
-
-            return Ok(());
-        }
-
-        #[cfg(CONFIG_BLK_DEV_ZONED)]
-        if this.zoned.enabled {
-            this.handle_zoned_command(&hw_data, &mut rq)?;
-        } else {
-            this.handle_regular_command(&hw_data, &mut rq)?;
-        }
-
-        #[cfg(not(CONFIG_BLK_DEV_ZONED))]
-        this.handle_regular_command(&hw_data, &mut rq)?;
-
-        if is_poll {
-            // NOTE: We lack the ability to insert `Owned<Request>` into a
-            // `kernel::list::List`, so we use a `RingBuffer` instead. The
-            // drawback of this is that we have to allocate the space for the
-            // ring buffer during drive initialization, and we have to hold the
-            // lock protecting the list until we have processed all the requests
-            // in the list. Change to a linked list when the kernel gets this
-            // ability.
-
-            // NOTE: We are processing requests during submit rather than during
-            // poll. This is different from C driver. C driver does processing
-            // during poll.
-
-            hw_data.lock().poll_queue.push_head(rq)?;
-        } else {
-            this.complete_request(rq);
-        }
-        Ok(())
+        drop(core::mem::replace(requests, requeue));
     }
 
     fn commit_rqs(_hw_data: Pin<&SpinLock<HwQueueContext>>, _queue_data: ArcBorrow<'_, Self>) {}
@@ -888,7 +943,6 @@ fn poll(
             let status = rq.data_ref().error.load(ordering::Relaxed);
             rq.data_ref().error.store(0, ordering::Relaxed);
 
-            // TODO: check error handling via status
             if let Err(rq) = batch.add_request(rq, status != 0) {
                 Self::end_request(rq);
             }

-- 
2.51.2




  parent reply	other threads:[~2026-02-16  4:13 UTC|newest]

Thread overview: 82+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-02-15 23:34 [PATCH 00/79] block: rnull: complete the rust null block driver Andreas Hindborg
2026-02-15 23:34 ` [PATCH 01/79] block: rnull: adopt new formatting guidelines Andreas Hindborg
2026-02-15 23:34 ` [PATCH 02/79] block: rnull: add module parameters Andreas Hindborg
2026-02-15 23:34 ` [PATCH 03/79] block: rnull: add macros to define configfs attributes Andreas Hindborg
2026-02-15 23:34 ` [PATCH 04/79] block: rust: fix generation of bindings to `BLK_STS_.*` Andreas Hindborg
2026-02-15 23:34 ` [PATCH 05/79] block: rust: change `queue_rq` request type to `Owned` Andreas Hindborg
2026-02-15 23:34 ` [PATCH 06/79] block: rust: add `Request` private data support Andreas Hindborg
2026-02-15 23:34 ` [PATCH 07/79] block: rust: allow `hrtimer::Timer` in `RequestData` Andreas Hindborg
2026-02-15 23:34 ` [PATCH 08/79] block: rnull: add timer completion mode Andreas Hindborg
2026-02-15 23:34 ` [PATCH 09/79] block: rust: introduce `kernel::block::bio` module Andreas Hindborg
2026-02-15 23:34 ` [PATCH 10/79] block: rust: add `command` getter to `Request` Andreas Hindborg
2026-02-15 23:34 ` [PATCH 11/79] block: rust: mq: use GFP_KERNEL from prelude Andreas Hindborg
2026-02-15 23:34 ` [PATCH 12/79] block: rust: add `TagSet` flags Andreas Hindborg
2026-02-15 23:35 ` [PATCH 13/79] block: rnull: add memory backing Andreas Hindborg
2026-02-15 23:35 ` [PATCH 14/79] block: rnull: add submit queue count config option Andreas Hindborg
2026-02-15 23:35 ` [PATCH 15/79] block: rnull: add `use_per_node_hctx` " Andreas Hindborg
2026-02-15 23:35 ` [PATCH 16/79] block: rust: allow specifying home node when constructing `TagSet` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 17/79] block: rnull: allow specifying the home numa node Andreas Hindborg
2026-02-15 23:35 ` [PATCH 18/79] block: rust: add Request::sectors() method Andreas Hindborg
2026-02-15 23:35 ` [PATCH 19/79] block: rust: mq: add max_hw_discard_sectors support to GenDiskBuilder Andreas Hindborg
2026-02-15 23:35 ` [PATCH 20/79] block: rnull: add discard support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 21/79] block: rust: add `NoDefaultScheduler` flag for `TagSet` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 22/79] block: rnull: add no_sched module parameter and configfs attribute Andreas Hindborg
2026-02-15 23:35 ` [PATCH 23/79] block: rust: change sector type from usize to u64 Andreas Hindborg
2026-02-15 23:35 ` [PATCH 24/79] block: rust: add `BadBlocks` for bad block tracking Andreas Hindborg
2026-02-15 23:35 ` [PATCH 25/79] block: rust: mq: add Request::end() method for custom status codes Andreas Hindborg
2026-02-15 23:35 ` [PATCH 26/79] block: rnull: add badblocks support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 27/79] block: rnull: add badblocks_once support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 28/79] block: rnull: add partial I/O support for bad blocks Andreas Hindborg
2026-02-15 23:35 ` [PATCH 29/79] block: rust: add `TagSet` private data support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 30/79] block: rust: add `hctx` " Andreas Hindborg
2026-02-15 23:35 ` [PATCH 31/79] block: rnull: add volatile cache emulation Andreas Hindborg
2026-02-15 23:35 ` [PATCH 32/79] block: rust: implement `Sync` for `GenDisk` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 33/79] block: rust: add a back reference feature to `GenDisk` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 34/79] block: rust: introduce an idle type state for `Request` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 35/79] block: rust: add a request queue abstraction Andreas Hindborg
2026-02-15 23:35 ` [PATCH 36/79] block: rust: add a method to get the request queue for a request Andreas Hindborg
2026-02-15 23:35 ` [PATCH 37/79] block: rust: introduce `kernel::block::error` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 38/79] block: rust: require `queue_rq` to return a `BlkResult` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 39/79] block: rust: add `GenDisk::queue_data` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 40/79] block: rnull: add bandwidth limiting Andreas Hindborg
2026-02-15 23:35 ` [PATCH 41/79] block: rnull: add blocking queue mode Andreas Hindborg
2026-02-15 23:35 ` [PATCH 42/79] block: rnull: add shared tags Andreas Hindborg
2026-02-15 23:35 ` [PATCH 43/79] block: rnull: add queue depth config option Andreas Hindborg
2026-02-15 23:35 ` [PATCH 44/79] block: rust: add an abstraction for `bindings::req_op` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 45/79] block: rust: add a method to set the target sector of a request Andreas Hindborg
2026-02-15 23:35 ` [PATCH 46/79] block: rust: move gendisk vtable construction to separate function Andreas Hindborg
2026-02-15 23:35 ` [PATCH 47/79] block: rust: add zoned block device support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 48/79] block: rnull: add zoned storage support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 49/79] block: rust: add `map_queues` support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 50/79] block: rust: add an abstraction for `struct blk_mq_queue_map` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 51/79] block: rust: add polled completion support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 52/79] block: rust: add accessors to `TagSet` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 53/79] block: rnull: add polled completion support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 54/79] block: rnull: add REQ_OP_FLUSH support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 55/79] block: rust: add request flags abstraction Andreas Hindborg
2026-02-15 23:35 ` [PATCH 56/79] block: rust: add abstraction for block queue feature flags Andreas Hindborg
2026-02-15 23:35 ` [PATCH 57/79] block: rust: allow setting write cache and FUA flags for `GenDisk` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 58/79] block: rust: add `Segment::copy_to_page_limit` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 59/79] block: rnull: add fua support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 60/79] block: fix arg type in `blk_mq_update_nr_hw_queues` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 61/79] block: rust: add `GenDisk::tag_set` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 62/79] block: rust: add `TagSet::update_hw_queue_count` Andreas Hindborg
2026-02-16 23:59   ` Ken Kurematsu
2026-02-17  9:54     ` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 63/79] block: rnull: add an option to change the number of hardware queues Andreas Hindborg
2026-02-15 23:35 ` [PATCH 64/79] block: rust: add an abstraction for `struct rq_list` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 65/79] block: rust: add `queue_rqs` vtable hook Andreas Hindborg
2026-02-15 23:35 ` Andreas Hindborg [this message]
2026-02-15 23:35 ` [PATCH 67/79] block: rust: remove the `is_poll` parameter from `queue_rq` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 68/79] block: rust: add a debug assert for refcounts Andreas Hindborg
2026-02-15 23:35 ` [PATCH 69/79] block: rust: add `TagSet::tag_to_rq` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 70/79] block: rust: add `Request::queue_index` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 71/79] block: rust: add `Request::requeue` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 72/79] block: rust: add `request_timeout` hook Andreas Hindborg
2026-02-15 23:36 ` [PATCH 73/79] block: rnull: add fault injection support Andreas Hindborg
2026-02-15 23:36 ` [PATCH 74/79] block: rust: add max_sectors option to `GenDiskBuilder` Andreas Hindborg
2026-02-15 23:36 ` [PATCH 75/79] block: rnull: allow configuration of the maximum IO size Andreas Hindborg
2026-02-15 23:36 ` [PATCH 76/79] block: rust: add `virt_boundary_mask` option to `GenDiskBuilder` Andreas Hindborg
2026-02-15 23:36 ` [PATCH 77/79] block: rnull: add `virt_boundary` option Andreas Hindborg
2026-02-15 23:36 ` [PATCH 78/79] block: rnull: add `shared_tag_bitmap` config option Andreas Hindborg
2026-02-15 23:36 ` [PATCH 79/79] block: rnull: add zone offline and readonly configfs files Andreas Hindborg

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