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author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-12-29 00:19:59 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-12-29 00:19:59 +0300 |
commit | 0e9da3fbf7d81f0f913b491c8de1ba7883d4f217 (patch) | |
tree | 2b3d25e3be60bf4ee40b4690c7bb9d6fa499ae69 /net/core | |
parent | b12a9124eeb71d766a3e3eb594ebbb3fefc66902 (diff) | |
parent | 00203ba40d40d7f33857416adfb18adaf0e40123 (diff) | |
download | linux-0e9da3fbf7d81f0f913b491c8de1ba7883d4f217.tar.xz |
Merge tag 'for-4.21/block-20181221' of git://git.kernel.dk/linux-block
Pull block updates from Jens Axboe:
"This is the main pull request for block/storage for 4.21.
Larger than usual, it was a busy round with lots of goodies queued up.
Most notable is the removal of the old IO stack, which has been a long
time coming. No new features for a while, everything coming in this
week has all been fixes for things that were previously merged.
This contains:
- Use atomic counters instead of semaphores for mtip32xx (Arnd)
- Cleanup of the mtip32xx request setup (Christoph)
- Fix for circular locking dependency in loop (Jan, Tetsuo)
- bcache (Coly, Guoju, Shenghui)
* Optimizations for writeback caching
* Various fixes and improvements
- nvme (Chaitanya, Christoph, Sagi, Jay, me, Keith)
* host and target support for NVMe over TCP
* Error log page support
* Support for separate read/write/poll queues
* Much improved polling
* discard OOM fallback
* Tracepoint improvements
- lightnvm (Hans, Hua, Igor, Matias, Javier)
* Igor added packed metadata to pblk. Now drives without metadata
per LBA can be used as well.
* Fix from Geert on uninitialized value on chunk metadata reads.
* Fixes from Hans and Javier to pblk recovery and write path.
* Fix from Hua Su to fix a race condition in the pblk recovery
code.
* Scan optimization added to pblk recovery from Zhoujie.
* Small geometry cleanup from me.
- Conversion of the last few drivers that used the legacy path to
blk-mq (me)
- Removal of legacy IO path in SCSI (me, Christoph)
- Removal of legacy IO stack and schedulers (me)
- Support for much better polling, now without interrupts at all.
blk-mq adds support for multiple queue maps, which enables us to
have a map per type. This in turn enables nvme to have separate
completion queues for polling, which can then be interrupt-less.
Also means we're ready for async polled IO, which is hopefully
coming in the next release.
- Killing of (now) unused block exports (Christoph)
- Unification of the blk-rq-qos and blk-wbt wait handling (Josef)
- Support for zoned testing with null_blk (Masato)
- sx8 conversion to per-host tag sets (Christoph)
- IO priority improvements (Damien)
- mq-deadline zoned fix (Damien)
- Ref count blkcg series (Dennis)
- Lots of blk-mq improvements and speedups (me)
- sbitmap scalability improvements (me)
- Make core inflight IO accounting per-cpu (Mikulas)
- Export timeout setting in sysfs (Weiping)
- Cleanup the direct issue path (Jianchao)
- Export blk-wbt internals in block debugfs for easier debugging
(Ming)
- Lots of other fixes and improvements"
* tag 'for-4.21/block-20181221' of git://git.kernel.dk/linux-block: (364 commits)
kyber: use sbitmap add_wait_queue/list_del wait helpers
sbitmap: add helpers for add/del wait queue handling
block: save irq state in blkg_lookup_create()
dm: don't reuse bio for flushes
nvme-pci: trace SQ status on completions
nvme-rdma: implement polling queue map
nvme-fabrics: allow user to pass in nr_poll_queues
nvme-fabrics: allow nvmf_connect_io_queue to poll
nvme-core: optionally poll sync commands
block: make request_to_qc_t public
nvme-tcp: fix spelling mistake "attepmpt" -> "attempt"
nvme-tcp: fix endianess annotations
nvmet-tcp: fix endianess annotations
nvme-pci: refactor nvme_poll_irqdisable to make sparse happy
nvme-pci: only set nr_maps to 2 if poll queues are supported
nvmet: use a macro for default error location
nvmet: fix comparison of a u16 with -1
blk-mq: enable IO poll if .nr_queues of type poll > 0
blk-mq: change blk_mq_queue_busy() to blk_mq_queue_inflight()
blk-mq: skip zero-queue maps in blk_mq_map_swqueue
...
Diffstat (limited to 'net/core')
-rw-r--r-- | net/core/datagram.c | 159 |
1 files changed, 64 insertions, 95 deletions
diff --git a/net/core/datagram.c b/net/core/datagram.c index 4bf62b1afa3b..b2651bb6d2a3 100644 --- a/net/core/datagram.c +++ b/net/core/datagram.c @@ -408,27 +408,20 @@ int skb_kill_datagram(struct sock *sk, struct sk_buff *skb, unsigned int flags) } EXPORT_SYMBOL(skb_kill_datagram); -/** - * skb_copy_datagram_iter - Copy a datagram to an iovec iterator. - * @skb: buffer to copy - * @offset: offset in the buffer to start copying from - * @to: iovec iterator to copy to - * @len: amount of data to copy from buffer to iovec - */ -int skb_copy_datagram_iter(const struct sk_buff *skb, int offset, - struct iov_iter *to, int len) +int __skb_datagram_iter(const struct sk_buff *skb, int offset, + struct iov_iter *to, int len, bool fault_short, + size_t (*cb)(const void *, size_t, void *, struct iov_iter *), + void *data) { int start = skb_headlen(skb); int i, copy = start - offset, start_off = offset, n; struct sk_buff *frag_iter; - trace_skb_copy_datagram_iovec(skb, len); - /* Copy header. */ if (copy > 0) { if (copy > len) copy = len; - n = copy_to_iter(skb->data + offset, copy, to); + n = cb(skb->data + offset, copy, data, to); offset += n; if (n != copy) goto short_copy; @@ -445,11 +438,14 @@ int skb_copy_datagram_iter(const struct sk_buff *skb, int offset, end = start + skb_frag_size(frag); if ((copy = end - offset) > 0) { + struct page *page = skb_frag_page(frag); + u8 *vaddr = kmap(page); + if (copy > len) copy = len; - n = copy_page_to_iter(skb_frag_page(frag), - frag->page_offset + offset - - start, copy, to); + n = cb(vaddr + frag->page_offset + + offset - start, copy, data, to); + kunmap(page); offset += n; if (n != copy) goto short_copy; @@ -468,8 +464,8 @@ int skb_copy_datagram_iter(const struct sk_buff *skb, int offset, if ((copy = end - offset) > 0) { if (copy > len) copy = len; - if (skb_copy_datagram_iter(frag_iter, offset - start, - to, copy)) + if (__skb_datagram_iter(frag_iter, offset - start, + to, copy, fault_short, cb, data)) goto fault; if ((len -= copy) == 0) return 0; @@ -490,11 +486,50 @@ fault: return -EFAULT; short_copy: - if (iov_iter_count(to)) + if (fault_short || iov_iter_count(to)) goto fault; return 0; } + +/** + * skb_copy_and_hash_datagram_iter - Copy datagram to an iovec iterator + * and update a hash. + * @skb: buffer to copy + * @offset: offset in the buffer to start copying from + * @to: iovec iterator to copy to + * @len: amount of data to copy from buffer to iovec + * @hash: hash request to update + */ +int skb_copy_and_hash_datagram_iter(const struct sk_buff *skb, int offset, + struct iov_iter *to, int len, + struct ahash_request *hash) +{ + return __skb_datagram_iter(skb, offset, to, len, true, + hash_and_copy_to_iter, hash); +} +EXPORT_SYMBOL(skb_copy_and_hash_datagram_iter); + +static size_t simple_copy_to_iter(const void *addr, size_t bytes, + void *data __always_unused, struct iov_iter *i) +{ + return copy_to_iter(addr, bytes, i); +} + +/** + * skb_copy_datagram_iter - Copy a datagram to an iovec iterator. + * @skb: buffer to copy + * @offset: offset in the buffer to start copying from + * @to: iovec iterator to copy to + * @len: amount of data to copy from buffer to iovec + */ +int skb_copy_datagram_iter(const struct sk_buff *skb, int offset, + struct iov_iter *to, int len) +{ + trace_skb_copy_datagram_iovec(skb, len); + return __skb_datagram_iter(skb, offset, to, len, false, + simple_copy_to_iter, NULL); +} EXPORT_SYMBOL(skb_copy_datagram_iter); /** @@ -645,87 +680,21 @@ int zerocopy_sg_from_iter(struct sk_buff *skb, struct iov_iter *from) } EXPORT_SYMBOL(zerocopy_sg_from_iter); +/** + * skb_copy_and_csum_datagram_iter - Copy datagram to an iovec iterator + * and update a checksum. + * @skb: buffer to copy + * @offset: offset in the buffer to start copying from + * @to: iovec iterator to copy to + * @len: amount of data to copy from buffer to iovec + * @csump: checksum pointer + */ static int skb_copy_and_csum_datagram(const struct sk_buff *skb, int offset, struct iov_iter *to, int len, __wsum *csump) { - int start = skb_headlen(skb); - int i, copy = start - offset, start_off = offset; - struct sk_buff *frag_iter; - int pos = 0; - int n; - - /* Copy header. */ - if (copy > 0) { - if (copy > len) - copy = len; - n = csum_and_copy_to_iter(skb->data + offset, copy, csump, to); - offset += n; - if (n != copy) - goto fault; - if ((len -= copy) == 0) - return 0; - pos = copy; - } - - for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { - int end; - const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; - - WARN_ON(start > offset + len); - - end = start + skb_frag_size(frag); - if ((copy = end - offset) > 0) { - __wsum csum2 = 0; - struct page *page = skb_frag_page(frag); - u8 *vaddr = kmap(page); - - if (copy > len) - copy = len; - n = csum_and_copy_to_iter(vaddr + frag->page_offset + - offset - start, copy, - &csum2, to); - kunmap(page); - offset += n; - if (n != copy) - goto fault; - *csump = csum_block_add(*csump, csum2, pos); - if (!(len -= copy)) - return 0; - pos += copy; - } - start = end; - } - - skb_walk_frags(skb, frag_iter) { - int end; - - WARN_ON(start > offset + len); - - end = start + frag_iter->len; - if ((copy = end - offset) > 0) { - __wsum csum2 = 0; - if (copy > len) - copy = len; - if (skb_copy_and_csum_datagram(frag_iter, - offset - start, - to, copy, - &csum2)) - goto fault; - *csump = csum_block_add(*csump, csum2, pos); - if ((len -= copy) == 0) - return 0; - offset += copy; - pos += copy; - } - start = end; - } - if (!len) - return 0; - -fault: - iov_iter_revert(to, offset - start_off); - return -EFAULT; + return __skb_datagram_iter(skb, offset, to, len, true, + csum_and_copy_to_iter, csump); } /** |