Merge tag 'dmaengine-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/dmaengine

Pull dmaengine updates from Dan Williams:
 "Even though this has fixes marked for -stable, given the size and the
  needed conflict resolutions this is 3.18-rc1/merge-window material.

  These patches have been languishing in my tree for a long while.  The
  fact that I do not have the time to do proper/prompt maintenance of
  this tree is a primary factor in the decision to step down as
  dmaengine maintainer.  That and the fact that the bulk of drivers/dma/
  activity is going through Vinod these days.

  The net_dma removal has not been in -next.  It has developed simple
  conflicts against mainline and net-next (for-3.18).

  Continuing thanks to Vinod for staying on top of drivers/dma/.

  Summary:

   1/ Step down as dmaengine maintainer see commit 08223d80
      "dmaengine maintainer update"

   2/ Removal of net_dma, as it has been marked 'broken' since 3.13
      (commit 77873803 "net_dma: mark broken"), without reports of
      performance regression.

   3/ Miscellaneous fixes"

* tag 'dmaengine-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/dmaengine:
  net: make tcp_cleanup_rbuf private
  net_dma: revert 'copied_early'
  net_dma: simple removal
  dmaengine maintainer update
  dmatest: prevent memory leakage on error path in thread
  ioat: Use time_before_jiffies()
  dmaengine: fix xor sources continuation
  dma: mv_xor: Rename __mv_xor_slot_cleanup() to mv_xor_slot_cleanup()
  dma: mv_xor: Remove all callers of mv_xor_slot_cleanup()
  dma: mv_xor: Remove unneeded mv_xor_clean_completed_slots() call
  ioat: Use pci_enable_msix_exact() instead of pci_enable_msix()
  drivers: dma: Include appropriate header file in dca.c
  drivers: dma: Mark functions as static in dma_v3.c
  dma: mv_xor: Add DMA API error checks
  ioat/dca: Use dev_is_pci() to check whether it is pci device

Documentation/ABI/removed/net_dma

+What:		tcp_dma_copybreak sysctl
+Date:		Removed in kernel v3.13
+Contact:	Dan Williams <dan.j.williams@intel.com>
+Description:
+	Formerly the lower limit, in bytes, of the size of socket reads
+	that will be offloaded to a DMA copy engine.  Removed due to
+	coherency issues of the cpu potentially touching the buffers
+	while dma is in flight.

Documentation/networking/ip-sysctl.txt

@@ -580,12 +580,6 @@ tcp_workaround_signed_windows - BOOLEAN
 	not receive a window scaling option from them.
 	Default: 0
 
-tcp_dma_copybreak - INTEGER
-	Lower limit, in bytes, of the size of socket reads that will be
-	offloaded to a DMA copy engine, if one is present in the system
-	and CONFIG_NET_DMA is enabled.
-	Default: 4096
-
 tcp_thin_linear_timeouts - BOOLEAN
 	Enable dynamic triggering of linear timeouts for thin streams.
 	If set, a check is performed upon retransmission by timeout to

MAINTAINERS

@@ -1025,24 +1025,20 @@ F:	arch/arm/mach-pxa/colibri-pxa270-income.c
 
 ARM/INTEL IOP32X ARM ARCHITECTURE
 M:	Lennert Buytenhek <kernel@wantstofly.org>
-M:	Dan Williams <dan.j.williams@intel.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
 
 ARM/INTEL IOP33X ARM ARCHITECTURE
-M:	Dan Williams <dan.j.williams@intel.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
-S:	Maintained
+S:	Orphan
 
 ARM/INTEL IOP13XX ARM ARCHITECTURE
 M:	Lennert Buytenhek <kernel@wantstofly.org>
-M:	Dan Williams <dan.j.williams@intel.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
 
 ARM/INTEL IQ81342EX MACHINE SUPPORT
 M:	Lennert Buytenhek <kernel@wantstofly.org>
-M:	Dan Williams <dan.j.williams@intel.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
 
@@ -1067,7 +1063,6 @@ F:	drivers/pcmcia/pxa2xx_stargate2.c
 
 ARM/INTEL XSC3 (MANZANO) ARM CORE
 M:	Lennert Buytenhek <kernel@wantstofly.org>
-M:	Dan Williams <dan.j.williams@intel.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
 
@@ -1562,9 +1557,9 @@ F:	drivers/platform/x86/asus*.c
 F:	drivers/platform/x86/eeepc*.c
 
 ASYNCHRONOUS TRANSFERS/TRANSFORMS (IOAT) API
-M:	Dan Williams <dan.j.williams@intel.com>
+R:	Dan Williams <dan.j.williams@intel.com>
 W:	http://sourceforge.net/projects/xscaleiop
-S:	Maintained
+S:	Odd fixes
 F:	Documentation/crypto/async-tx-api.txt
 F:	crypto/async_tx/
 F:	drivers/dma/
@@ -2995,13 +2990,11 @@ T:	git git://git.linaro.org/people/sumitsemwal/linux-dma-buf.git
 
 DMA GENERIC OFFLOAD ENGINE SUBSYSTEM
 M:	Vinod Koul <vinod.koul@intel.com>
-M:	Dan Williams <dan.j.williams@intel.com>
 L:	dmaengine@vger.kernel.org
 Q:	https://patchwork.kernel.org/project/linux-dmaengine/list/
-S:	Supported
+S:	Maintained
 F:	drivers/dma/
 F:	include/linux/dma*
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx.git
 T:	git git://git.infradead.org/users/vkoul/slave-dma.git (slave-dma)
 
 DME1737 HARDWARE MONITOR DRIVER
@@ -4754,8 +4747,8 @@ F:	arch/x86/kernel/cpu/microcode/core*
 F:	arch/x86/kernel/cpu/microcode/intel*
 
 INTEL I/OAT DMA DRIVER
-M:	Dan Williams <dan.j.williams@intel.com>
 M:	Dave Jiang <dave.jiang@intel.com>
+R:	Dan Williams <dan.j.williams@intel.com>
 L:	dmaengine@vger.kernel.org
 Q:	https://patchwork.kernel.org/project/linux-dmaengine/list/
 S:	Supported
@@ -4770,7 +4763,7 @@ F:	drivers/iommu/intel-iommu.c
 F:	include/linux/intel-iommu.h
 
 INTEL IOP-ADMA DMA DRIVER
-M:	Dan Williams <dan.j.williams@intel.com>
+R:	Dan Williams <dan.j.williams@intel.com>
 S:	Odd fixes
 F:	drivers/dma/iop-adma.c
 

crypto/async_tx/async_xor.c

@@ -78,8 +78,6 @@ do_async_xor(struct dma_chan *chan, struct dmaengine_unmap_data *unmap,
 		tx = dma->device_prep_dma_xor(chan, dma_dest, src_list,
 					      xor_src_cnt, unmap->len,
 					      dma_flags);
-		src_list[0] = tmp;
-
 
 		if (unlikely(!tx))
 			async_tx_quiesce(&submit->depend_tx);
@@ -92,6 +90,7 @@ do_async_xor(struct dma_chan *chan, struct dmaengine_unmap_data *unmap,
 						      xor_src_cnt, unmap->len,
 						      dma_flags);
 		}
+		src_list[0] = tmp;
 
 		dma_set_unmap(tx, unmap);
 		async_tx_submit(chan, tx, submit);

drivers/dma/Kconfig

@@ -427,18 +427,6 @@ config DMA_OF
 comment "DMA Clients"
 	depends on DMA_ENGINE
 
-config NET_DMA
-	bool "Network: TCP receive copy offload"
-	depends on DMA_ENGINE && NET
-	default (INTEL_IOATDMA || FSL_DMA)
-	depends on BROKEN
-	help
-	  This enables the use of DMA engines in the network stack to
-	  offload receive copy-to-user operations, freeing CPU cycles.
-
-	  Say Y here if you enabled INTEL_IOATDMA or FSL_DMA, otherwise
-	  say N.
-
 config ASYNC_TX_DMA
 	bool "Async_tx: Offload support for the async_tx api"
 	depends on DMA_ENGINE

drivers/dma/Makefile

@@ -6,7 +6,6 @@ obj-$(CONFIG_DMA_VIRTUAL_CHANNELS) += virt-dma.o
 obj-$(CONFIG_DMA_ACPI) += acpi-dma.o
 obj-$(CONFIG_DMA_OF) += of-dma.o
 
-obj-$(CONFIG_NET_DMA) += iovlock.o
 obj-$(CONFIG_INTEL_MID_DMAC) += intel_mid_dma.o
 obj-$(CONFIG_DMATEST) += dmatest.o
 obj-$(CONFIG_INTEL_IOATDMA) += ioat/

drivers/dma/dmaengine.c

@@ -1081,110 +1081,6 @@ dmaengine_get_unmap_data(struct device *dev, int nr, gfp_t flags)
 }
 EXPORT_SYMBOL(dmaengine_get_unmap_data);
 
-/**
- * dma_async_memcpy_pg_to_pg - offloaded copy from page to page
- * @chan: DMA channel to offload copy to
- * @dest_pg: destination page
- * @dest_off: offset in page to copy to
- * @src_pg: source page
- * @src_off: offset in page to copy from
- * @len: length
- *
- * Both @dest_page/@dest_off and @src_page/@src_off must be mappable to a bus
- * address according to the DMA mapping API rules for streaming mappings.
- * Both @dest_page/@dest_off and @src_page/@src_off must stay memory resident
- * (kernel memory or locked user space pages).
- */
-dma_cookie_t
-dma_async_memcpy_pg_to_pg(struct dma_chan *chan, struct page *dest_pg,
-	unsigned int dest_off, struct page *src_pg, unsigned int src_off,
-	size_t len)
-{
-	struct dma_device *dev = chan->device;
-	struct dma_async_tx_descriptor *tx;
-	struct dmaengine_unmap_data *unmap;
-	dma_cookie_t cookie;
-	unsigned long flags;
-
-	unmap = dmaengine_get_unmap_data(dev->dev, 2, GFP_NOWAIT);
-	if (!unmap)
-		return -ENOMEM;
-
-	unmap->to_cnt = 1;
-	unmap->from_cnt = 1;
-	unmap->addr[0] = dma_map_page(dev->dev, src_pg, src_off, len,
-				      DMA_TO_DEVICE);
-	unmap->addr[1] = dma_map_page(dev->dev, dest_pg, dest_off, len,
-				      DMA_FROM_DEVICE);
-	unmap->len = len;
-	flags = DMA_CTRL_ACK;
-	tx = dev->device_prep_dma_memcpy(chan, unmap->addr[1], unmap->addr[0],
-					 len, flags);
-
-	if (!tx) {
-		dmaengine_unmap_put(unmap);
-		return -ENOMEM;
-	}
-
-	dma_set_unmap(tx, unmap);
-	cookie = tx->tx_submit(tx);
-	dmaengine_unmap_put(unmap);
-
-	preempt_disable();
-	__this_cpu_add(chan->local->bytes_transferred, len);
-	__this_cpu_inc(chan->local->memcpy_count);
-	preempt_enable();
-
-	return cookie;
-}
-EXPORT_SYMBOL(dma_async_memcpy_pg_to_pg);
-
-/**
- * dma_async_memcpy_buf_to_buf - offloaded copy between virtual addresses
- * @chan: DMA channel to offload copy to
- * @dest: destination address (virtual)
- * @src: source address (virtual)
- * @len: length
- *
- * Both @dest and @src must be mappable to a bus address according to the
- * DMA mapping API rules for streaming mappings.
- * Both @dest and @src must stay memory resident (kernel memory or locked
- * user space pages).
- */
-dma_cookie_t
-dma_async_memcpy_buf_to_buf(struct dma_chan *chan, void *dest,
-			    void *src, size_t len)
-{
-	return dma_async_memcpy_pg_to_pg(chan, virt_to_page(dest),
-					 (unsigned long) dest & ~PAGE_MASK,
-					 virt_to_page(src),
-					 (unsigned long) src & ~PAGE_MASK, len);
-}
-EXPORT_SYMBOL(dma_async_memcpy_buf_to_buf);
-
-/**
- * dma_async_memcpy_buf_to_pg - offloaded copy from address to page
- * @chan: DMA channel to offload copy to
- * @page: destination page
- * @offset: offset in page to copy to
- * @kdata: source address (virtual)
- * @len: length
- *
- * Both @page/@offset and @kdata must be mappable to a bus address according
- * to the DMA mapping API rules for streaming mappings.
- * Both @page/@offset and @kdata must stay memory resident (kernel memory or
- * locked user space pages)
- */
-dma_cookie_t
-dma_async_memcpy_buf_to_pg(struct dma_chan *chan, struct page *page,
-			   unsigned int offset, void *kdata, size_t len)
-{
-	return dma_async_memcpy_pg_to_pg(chan, page, offset,
-					 virt_to_page(kdata),
-					 (unsigned long) kdata & ~PAGE_MASK, len);
-}
-EXPORT_SYMBOL(dma_async_memcpy_buf_to_pg);
-
 void dma_async_tx_descriptor_init(struct dma_async_tx_descriptor *tx,
 	struct dma_chan *chan)
 {

drivers/dma/dmatest.c

@@ -688,14 +688,14 @@ static int dmatest_func(void *data)
 	runtime = ktime_us_delta(ktime_get(), ktime);
 
 	ret = 0;
+err_dstbuf:
 	for (i = 0; thread->dsts[i]; i++)
 		kfree(thread->dsts[i]);
-err_dstbuf:
 	kfree(thread->dsts);
 err_dsts:
+err_srcbuf:
 	for (i = 0; thread->srcs[i]; i++)
 		kfree(thread->srcs[i]);
-err_srcbuf:
 	kfree(thread->srcs);
 err_srcs:
 	kfree(pq_coefs);

drivers/dma/ioat/dca.c

@@ -35,6 +35,7 @@
 
 #include "dma.h"
 #include "registers.h"
+#include "dma_v2.h"
 
 /*
  * Bit 7 of a tag map entry is the "valid" bit, if it is set then bits 0:6
@@ -147,7 +148,7 @@ static int ioat_dca_add_requester(struct dca_provider *dca, struct device *dev)
 	u16 id;
 
 	/* This implementation only supports PCI-Express */
-	if (dev->bus != &pci_bus_type)
+	if (!dev_is_pci(dev))
 		return -ENODEV;
 	pdev = to_pci_dev(dev);
 	id = dcaid_from_pcidev(pdev);
@@ -179,7 +180,7 @@ static int ioat_dca_remove_requester(struct dca_provider *dca,
 	int i;
 
 	/* This implementation only supports PCI-Express */
-	if (dev->bus != &pci_bus_type)
+	if (!dev_is_pci(dev))
 		return -ENODEV;
 	pdev = to_pci_dev(dev);
 
@@ -320,7 +321,7 @@ static int ioat2_dca_add_requester(struct dca_provider *dca, struct device *dev)
 	u16 global_req_table;
 
 	/* This implementation only supports PCI-Express */
-	if (dev->bus != &pci_bus_type)
+	if (!dev_is_pci(dev))
 		return -ENODEV;
 	pdev = to_pci_dev(dev);
 	id = dcaid_from_pcidev(pdev);
@@ -354,7 +355,7 @@ static int ioat2_dca_remove_requester(struct dca_provider *dca,
 	u16 global_req_table;
 
 	/* This implementation only supports PCI-Express */
-	if (dev->bus != &pci_bus_type)
+	if (!dev_is_pci(dev))
 		return -ENODEV;
 	pdev = to_pci_dev(dev);
 
@@ -496,7 +497,7 @@ static int ioat3_dca_add_requester(struct dca_provider *dca, struct device *dev)
 	u16 global_req_table;
 
 	/* This implementation only supports PCI-Express */
-	if (dev->bus != &pci_bus_type)
+	if (!dev_is_pci(dev))
 		return -ENODEV;
 	pdev = to_pci_dev(dev);
 	id = dcaid_from_pcidev(pdev);
@@ -530,7 +531,7 @@ static int ioat3_dca_remove_requester(struct dca_provider *dca,
 	u16 global_req_table;
 
 	/* This implementation only supports PCI-Express */
-	if (dev->bus != &pci_bus_type)
+	if (!dev_is_pci(dev))
 		return -ENODEV;
 	pdev = to_pci_dev(dev);
 

drivers/dma/ioat/dma.c

@@ -947,7 +947,7 @@ int ioat_dma_setup_interrupts(struct ioatdma_device *device)
 	for (i = 0; i < msixcnt; i++)
 		device->msix_entries[i].entry = i;
 
-	err = pci_enable_msix(pdev, device->msix_entries, msixcnt);
+	err = pci_enable_msix_exact(pdev, device->msix_entries, msixcnt);
 	if (err)
 		goto msi;
 
@@ -1222,7 +1222,6 @@ int ioat1_dma_probe(struct ioatdma_device *device, int dca)
 	err = ioat_probe(device);
 	if (err)
 		return err;
-	ioat_set_tcp_copy_break(4096);
 	err = ioat_register(device);
 	if (err)
 		return err;

drivers/dma/ioat/dma.h

@@ -214,13 +214,6 @@ __dump_desc_dbg(struct ioat_chan_common *chan, struct ioat_dma_descriptor *hw,
 #define dump_desc_dbg(c, d) \
 	({ if (d) __dump_desc_dbg(&c->base, d->hw, &d->txd, desc_id(d)); 0; })
 
-static inline void ioat_set_tcp_copy_break(unsigned long copybreak)
-{
-	#ifdef CONFIG_NET_DMA
-	sysctl_tcp_dma_copybreak = copybreak;
-	#endif
-}
-
 static inline struct ioat_chan_common *
 ioat_chan_by_index(struct ioatdma_device *device, int index)
 {

drivers/dma/ioat/dma_v2.c

@@ -735,7 +735,8 @@ int ioat2_check_space_lock(struct ioat2_dma_chan *ioat, int num_descs)
 	 * called under bh_disabled so we need to trigger the timer
 	 * event directly
 	 */
-	if (jiffies > chan->timer.expires && timer_pending(&chan->timer)) {
+	if (time_is_before_jiffies(chan->timer.expires)
+	    && timer_pending(&chan->timer)) {
 		struct ioatdma_device *device = chan->device;
 
 		mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT);
@@ -899,7 +900,6 @@ int ioat2_dma_probe(struct ioatdma_device *device, int dca)
 	err = ioat_probe(device);
 	if (err)
 		return err;
-	ioat_set_tcp_copy_break(2048);
 
 	list_for_each_entry(c, &dma->channels, device_node) {
 		chan = to_chan_common(c);

drivers/dma/ioat/dma_v3.c

@@ -740,7 +740,7 @@ ioat3_prep_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
 	return __ioat3_prep_xor_lock(chan, NULL, dest, src, src_cnt, len, flags);
 }
 
-struct dma_async_tx_descriptor *
+static struct dma_async_tx_descriptor *
 ioat3_prep_xor_val(struct dma_chan *chan, dma_addr_t *src,
 		    unsigned int src_cnt, size_t len,
 		    enum sum_check_flags *result, unsigned long flags)
@@ -1091,7 +1091,7 @@ ioat3_prep_pq(struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src,
 	}
 }
 
-struct dma_async_tx_descriptor *
+static struct dma_async_tx_descriptor *
 ioat3_prep_pq_val(struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src,
 		  unsigned int src_cnt, const unsigned char *scf, size_t len,
 		  enum sum_check_flags *pqres, unsigned long flags)
@@ -1133,7 +1133,7 @@ ioat3_prep_pqxor(struct dma_chan *chan, dma_addr_t dst, dma_addr_t *src,
 				     flags);
 }
 
-struct dma_async_tx_descriptor *
+static struct dma_async_tx_descriptor *
 ioat3_prep_pqxor_val(struct dma_chan *chan, dma_addr_t *src,
 		     unsigned int src_cnt, size_t len,
 		     enum sum_check_flags *result, unsigned long flags)
@@ -1655,7 +1655,6 @@ int ioat3_dma_probe(struct ioatdma_device *device, int dca)
 	err = ioat_probe(device);
 	if (err)
 		return err;
-	ioat_set_tcp_copy_break(262144);
 
 	list_for_each_entry(c, &dma->channels, device_node) {
 		chan = to_chan_common(c);

drivers/dma/iovlock.c

-/*
- * Copyright(c) 2004 - 2006 Intel Corporation. All rights reserved.
- * Portions based on net/core/datagram.c and copyrighted by their authors.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 59
- * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
- *
- * The full GNU General Public License is included in this distribution in the
- * file called COPYING.
- */
-
-/*
- * This code allows the net stack to make use of a DMA engine for
- * skb to iovec copies.
- */
-
-#include <linux/dmaengine.h>
-#include <linux/pagemap.h>
-#include <linux/slab.h>
-#include <net/tcp.h> /* for memcpy_toiovec */
-#include <asm/io.h>
-#include <asm/uaccess.h>
-
-static int num_pages_spanned(struct iovec *iov)
-{
-	return
-	((PAGE_ALIGN((unsigned long)iov->iov_base + iov->iov_len) -
-	((unsigned long)iov->iov_base & PAGE_MASK)) >> PAGE_SHIFT);
-}
-
-/*
- * Pin down all the iovec pages needed for len bytes.
- * Return a struct dma_pinned_list to keep track of pages pinned down.
- *
- * We are allocating a single chunk of memory, and then carving it up into
- * 3 sections, the latter 2 whose size depends on the number of iovecs and the
- * total number of pages, respectively.
- */
-struct dma_pinned_list *dma_pin_iovec_pages(struct iovec *iov, size_t len)
-{
-	struct dma_pinned_list *local_list;
-	struct page **pages;
-	int i;
-	int ret;
-	int nr_iovecs = 0;
-	int iovec_len_used = 0;
-	int iovec_pages_used = 0;
-
-	/* don't pin down non-user-based iovecs */
-	if (segment_eq(get_fs(), KERNEL_DS))
-		return NULL;
-
-	/* determine how many iovecs/pages there are, up front */
-	do {
-		iovec_len_used += iov[nr_iovecs].iov_len;
-		iovec_pages_used += num_pages_spanned(&iov[nr_iovecs]);
-		nr_iovecs++;
-	} while (iovec_len_used < len);
-
-	/* single kmalloc for pinned list, page_list[], and the page arrays */
-	local_list = kmalloc(sizeof(*local_list)
-		+ (nr_iovecs * sizeof (struct dma_page_list))
-		+ (iovec_pages_used * sizeof (struct page*)), GFP_KERNEL);
-	if (!local_list)
-		goto out;
-
-	/* list of pages starts right after the page list array */
-	pages = (struct page **) &local_list->page_list[nr_iovecs];
-
-	local_list->nr_iovecs = 0;
-
-	for (i = 0; i < nr_iovecs; i++) {
-		struct dma_page_list *page_list = &local_list->page_list[i];
-
-		len -= iov[i].iov_len;
-
-		if (!access_ok(VERIFY_WRITE, iov[i].iov_base, iov[i].iov_len))
-			goto unpin;
-
-		page_list->nr_pages = num_pages_spanned(&iov[i]);
-		page_list->base_address = iov[i].iov_base;
-
-		page_list->pages = pages;
-		pages += page_list->nr_pages;
-
-		/* pin pages down */
-		down_read(&current->mm->mmap_sem);
-		ret = get_user_pages(
-			current,
-			current->mm,
-			(unsigned long) iov[i].iov_base,
-			page_list->nr_pages,
-			1,	/* write */
-			0,	/* force */
-			page_list->pages,
-			NULL);
-		up_read(&current->mm->mmap_sem);
-
-		if (ret != page_list->nr_pages)
-			goto unpin;
-
-		local_list->nr_iovecs = i + 1;
-	}
-
-	return local_list;
-
-unpin:
-	dma_unpin_iovec_pages(local_list);
-out:
-	return NULL;
-}
-
-void dma_unpin_iovec_pages(struct dma_pinned_list *pinned_list)
-{
-	int i, j;
-
-	if (!pinned_list)
-		return;
-
-	for (i = 0; i < pinned_list->nr_iovecs; i++) {
-		struct dma_page_list *page_list = &pinned_list->page_list[i];
-		for (j = 0; j < page_list->nr_pages; j++) {
-			set_page_dirty_lock(page_list->pages[j]);
-			page_cache_release(page_list->pages[j]);
-		}
-	}
-
-	kfree(pinned_list);
-}
-
-
-/*
- * We have already pinned down the pages we will be using in the iovecs.
- * Each entry in iov array has corresponding entry in pinned_list->page_list.
- * Using array indexing to keep iov[] and page_list[] in sync.
- * Initial elements in iov array's iov->iov_len will be 0 if already copied into
- *   by another call.
- * iov array length remaining guaranteed to be bigger than len.
- */
-dma_cookie_t dma_memcpy_to_iovec(struct dma_chan *chan, struct iovec *iov,
-	struct dma_pinned_list *pinned_list, unsigned char *kdata, size_t len)
-{
-	int iov_byte_offset;
-	int copy;
-	dma_cookie_t dma_cookie = 0;
-	int iovec_idx;
-	int page_idx;
-
-	if (!chan)
-		return memcpy_toiovec(iov, kdata, len);
-
-	iovec_idx = 0;
-	while (iovec_idx < pinned_list->nr_iovecs) {
-		struct dma_page_list *page_list;
-
-		/* skip already used-up iovecs */
-		while (!iov[iovec_idx].iov_len)
-			iovec_idx++;
-
-		page_list = &pinned_list->page_list[iovec_idx];
-
-		iov_byte_offset = ((unsigned long)iov[iovec_idx].iov_base & ~PAGE_MASK);
-		page_idx = (((unsigned long)iov[iovec_idx].iov_base & PAGE_MASK)
-			 - ((unsigned long)page_list->base_address & PAGE_MASK)) >> PAGE_SHIFT;
-
-		/* break up copies to not cross page boundary */
-		while (iov[iovec_idx].iov_len) {
-			copy = min_t(int, PAGE_SIZE - iov_byte_offset, len);
-			copy = min_t(int, copy, iov[iovec_idx].iov_len);
-
-			dma_cookie = dma_async_memcpy_buf_to_pg(chan,
-					page_list->pages[page_idx],
-					iov_byte_offset,
-					kdata,
-					copy);
-			/* poll for a descriptor slot */
-			if (unlikely(dma_cookie < 0)) {
-				dma_async_issue_pending(chan);
-				continue;
-			}
-
-			len -= copy;
-			iov[iovec_idx].iov_len -= copy;
-			iov[iovec_idx].iov_base += copy;
-
-			if (!len)
-				return dma_cookie;
-
-			kdata += copy;
-			iov_byte_offset = 0;
-			page_idx++;
-		}
-		iovec_idx++;
-	}
-
-	/* really bad if we ever run out of iovecs */
-	BUG();
-	return -EFAULT;
-}
-
-dma_cookie_t dma_memcpy_pg_to_iovec(struct dma_chan *chan, struct iovec *iov,
-	struct dma_pinned_list *pinned_list, struct page *page,
-	unsigned int offset, size_t len)
-{
-	int iov_byte_offset;
-	int copy;
-	dma_cookie_t dma_cookie = 0;
-	int iovec_idx;
-	int page_idx;
-	int err;
-
-	/* this needs as-yet-unimplemented buf-to-buff, so punt. */
-	/* TODO: use dma for this */
-	if (!chan || !pinned_list) {
-		u8 *vaddr = kmap(page);
-		err = memcpy_toiovec(iov, vaddr + offset, len);
-		kunmap(page);
-		return err;
-	}
-
-	iovec_idx = 0;
-	while (iovec_idx < pinned_list->nr_iovecs) {
-		struct dma_page_list *page_list;
-
-		/* skip already used-up iovecs */
-		while (!iov[iovec_idx].iov_len)
-			iovec_idx++;
-
-		page_list = &pinned_list->page_list[iovec_idx];
-
-		iov_byte_offset = ((unsigned long)iov[iovec_idx].iov_base & ~PAGE_MASK);
-		page_idx = (((unsigned long)iov[iovec_idx].iov_base & PAGE_MASK)
-			 - ((unsigned long)page_list->base_address & PAGE_MASK)) >> PAGE_SHIFT;
-
-		/* break up copies to not cross page boundary */
-		while (iov[iovec_idx].iov_len) {
-			copy = min_t(int, PAGE_SIZE - iov_byte_offset, len);
-			copy = min_t(int, copy, iov[iovec_idx].iov_len);
-
-			dma_cookie = dma_async_memcpy_pg_to_pg(chan,
-					page_list->pages[page_idx],
-					iov_byte_offset,
-					page,
-					offset,
-					copy);
-			/* poll for a descriptor slot */
-			if (unlikely(dma_cookie < 0)) {
-				dma_async_issue_pending(chan);
-				continue;
-			}
-
-			len -= copy;
-			iov[iovec_idx].iov_len -= copy;
-			iov[iovec_idx].iov_base += copy;
-
-			if (!len)
-				return dma_cookie;
-
-			offset += copy;
-			iov_byte_offset = 0;
-			page_idx++;
-		}
-		iovec_idx++;
-	}
-
-	/* really bad if we ever run out of iovecs */
-	BUG();
-	return -EFAULT;
-}

drivers/dma/mv_xor.c

@@ -310,7 +310,8 @@ mv_xor_clean_slot(struct mv_xor_desc_slot *desc,
 	return 0;
 }
 
-static void __mv_xor_slot_cleanup(struct mv_xor_chan *mv_chan)
+/* This function must be called with the mv_xor_chan spinlock held */
+static void mv_xor_slot_cleanup(struct mv_xor_chan *mv_chan)
 {
 	struct mv_xor_desc_slot *iter, *_iter;
 	dma_cookie_t cookie = 0;
@@ -366,18 +367,13 @@ static void __mv_xor_slot_cleanup(struct mv_xor_chan *mv_chan)
 		mv_chan->dmachan.completed_cookie = cookie;
 }
 
-static void
-mv_xor_slot_cleanup(struct mv_xor_chan *mv_chan)
-{
-	spin_lock_bh(&mv_chan->lock);
-	__mv_xor_slot_cleanup(mv_chan);
-	spin_unlock_bh(&mv_chan->lock);
-}
-
 static void mv_xor_tasklet(unsigned long data)
 {
 	struct mv_xor_chan *chan = (struct mv_xor_chan *) data;
+
+	spin_lock_bh(&chan->lock);
 	mv_xor_slot_cleanup(chan);
+	spin_unlock_bh(&chan->lock);
 }
 
 static struct mv_xor_desc_slot *
@@ -656,9 +652,10 @@ static void mv_xor_free_chan_resources(struct dma_chan *chan)
 	struct mv_xor_desc_slot *iter, *_iter;
 	int in_use_descs = 0;
 
+	spin_lock_bh(&mv_chan->lock);
+
 	mv_xor_slot_cleanup(mv_chan);
 
-	spin_lock_bh(&mv_chan->lock);
 	list_for_each_entry_safe(iter, _iter, &mv_chan->chain,
 					chain_node) {
 		in_use_descs++;
@@ -700,11 +697,12 @@ static enum dma_status mv_xor_status(struct dma_chan *chan,
 	enum dma_status ret;
 
 	ret = dma_cookie_status(chan, cookie, txstate);
-	if (ret == DMA_COMPLETE) {
-		mv_xor_clean_completed_slots(mv_chan);
+	if (ret == DMA_COMPLETE)
 		return ret;
-	}
+
+	spin_lock_bh(&mv_chan->lock);
 	mv_xor_slot_cleanup(mv_chan);
+	spin_unlock_bh(&mv_chan->lock);
 
 	return dma_cookie_status(chan, cookie, txstate);
 }
@@ -782,7 +780,7 @@ static void mv_xor_issue_pending(struct dma_chan *chan)
 
 static int mv_xor_memcpy_self_test(struct mv_xor_chan *mv_chan)
 {
-	int i;
+	int i, ret;
 	void *src, *dest;
 	dma_addr_t src_dma, dest_dma;
 	struct dma_chan *dma_chan;
@@ -819,19 +817,44 @@ static int mv_xor_memcpy_self_test(struct mv_xor_chan *mv_chan)
 
 	src_dma = dma_map_page(dma_chan->device->dev, virt_to_page(src), 0,
 				 PAGE_SIZE, DMA_TO_DEVICE);
-	unmap->to_cnt = 1;
 	unmap->addr[0] = src_dma;
 
+	ret = dma_mapping_error(dma_chan->device->dev, src_dma);
+	if (ret) {
+		err = -ENOMEM;
+		goto free_resources;
+	}
+	unmap->to_cnt = 1;
+
 	dest_dma = dma_map_page(dma_chan->device->dev, virt_to_page(dest), 0,
 				  PAGE_SIZE, DMA_FROM_DEVICE);
-	unmap->from_cnt = 1;
 	unmap->addr[1] = dest_dma;
 
+	ret = dma_mapping_error(dma_chan->device->dev, dest_dma);
+	if (ret) {
+		err = -ENOMEM;
+		goto free_resources;
+	}
+	unmap->from_cnt = 1;
 	unmap->len = PAGE_SIZE;
 
 	tx = mv_xor_prep_dma_memcpy(dma_chan, dest_dma, src_dma,
 				    PAGE_SIZE, 0);
+	if (!tx) {
+		dev_err(dma_chan->device->dev,
+			"Self-test cannot prepare operation, disabling\n");
+		err = -ENODEV;
+		goto free_resources;
+	}
+
 	cookie = mv_xor_tx_submit(tx);
+	if (dma_submit_error(cookie)) {
+		dev_err(dma_chan->device->dev,
+			"Self-test submit error, disabling\n");
+		err = -ENODEV;
+		goto free_resources;
+	}
+
 	mv_xor_issue_pending(dma_chan);
 	async_tx_ack(tx);
 	msleep(1);
@@ -866,7 +889,7 @@ static int mv_xor_memcpy_self_test(struct mv_xor_chan *mv_chan)
 static int
 mv_xor_xor_self_test(struct mv_xor_chan *mv_chan)
 {
-	int i, src_idx;
+	int i, src_idx, ret;
 	struct page *dest;
 	struct page *xor_srcs[MV_XOR_NUM_SRC_TEST];
 	dma_addr_t dma_srcs[MV_XOR_NUM_SRC_TEST];
@@ -929,19 +952,42 @@ mv_xor_xor_self_test(struct mv_xor_chan *mv_chan)
 		unmap->addr[i] = dma_map_page(dma_chan->device->dev, xor_srcs[i],
 					      0, PAGE_SIZE, DMA_TO_DEVICE);
 		dma_srcs[i] = unmap->addr[i];
+		ret = dma_mapping_error(dma_chan->device->dev, unmap->addr[i]);
+		if (ret) {
+			err = -ENOMEM;
+			goto free_resources;
+		}
 		unmap->to_cnt++;
 	}
 
 	unmap->addr[src_count] = dma_map_page(dma_chan->device->dev, dest, 0, PAGE_SIZE,
 				      DMA_FROM_DEVICE);
 	dest_dma = unmap->addr[src_count];
+	ret = dma_mapping_error(dma_chan->device->dev, unmap->addr[src_count]);
+	if (ret) {
+		err = -ENOMEM;
+		goto free_resources;
+	}
 	unmap->from_cnt = 1;
 	unmap->len = PAGE_SIZE;
 
 	tx = mv_xor_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
 				 src_count, PAGE_SIZE, 0);
+	if (!tx) {
+		dev_err(dma_chan->device->dev,
+			"Self-test cannot prepare operation, disabling\n");
+		err = -ENODEV;
+		goto free_resources;
+	}
 
 	cookie = mv_xor_tx_submit(tx);
+	if (dma_submit_error(cookie)) {
+		dev_err(dma_chan->device->dev,
+			"Self-test submit error, disabling\n");
+		err = -ENODEV;
+		goto free_resources;
+	}
+
 	mv_xor_issue_pending(dma_chan);
 	async_tx_ack(tx);
 	msleep(8);

include/linux/dmaengine.h

@@ -900,18 +900,6 @@ static inline void dmaengine_put(void)
 }
 #endif
 
-#ifdef CONFIG_NET_DMA
-#define net_dmaengine_get()	dmaengine_get()
-#define net_dmaengine_put()	dmaengine_put()
-#else
-static inline void net_dmaengine_get(void)
-{
-}
-static inline void net_dmaengine_put(void)
-{
-}
-#endif
-
 #ifdef CONFIG_ASYNC_TX_DMA
 #define async_dmaengine_get()	dmaengine_get()
 #define async_dmaengine_put()	dmaengine_put()
@@ -933,16 +921,8 @@ async_dma_find_channel(enum dma_transaction_type type)
 	return NULL;
 }
 #endif /* CONFIG_ASYNC_TX_DMA */
-
-dma_cookie_t dma_async_memcpy_buf_to_buf(struct dma_chan *chan,
-	void *dest, void *src, size_t len);
-dma_cookie_t dma_async_memcpy_buf_to_pg(struct dma_chan *chan,
-	struct page *page, unsigned int offset, void *kdata, size_t len);
-dma_cookie_t dma_async_memcpy_pg_to_pg(struct dma_chan *chan,
-	struct page *dest_pg, unsigned int dest_off, struct page *src_pg,
-	unsigned int src_off, size_t len);
 void dma_async_tx_descriptor_init(struct dma_async_tx_descriptor *tx,
-	struct dma_chan *chan);
+				  struct dma_chan *chan);
 
 static inline void async_tx_ack(struct dma_async_tx_descriptor *tx)
 {

include/linux/skbuff.h

@@ -28,7 +28,6 @@
 #include <linux/textsearch.h>
 #include <net/checksum.h>
 #include <linux/rcupdate.h>
-#include <linux/dmaengine.h>
 #include <linux/hrtimer.h>
 #include <linux/dma-mapping.h>
 #include <linux/netdev_features.h>
@@ -581,11 +580,8 @@ struct sk_buff {
 	/* 2/4 bit hole (depending on ndisc_nodetype presence) */
 	kmemcheck_bitfield_end(flags2);
 
-#if defined CONFIG_NET_DMA || defined CONFIG_NET_RX_BUSY_POLL
-	union {
-		unsigned int	napi_id;
-		dma_cookie_t	dma_cookie;
-	};
+#ifdef CONFIG_NET_RX_BUSY_POLL
+	unsigned int	napi_id;
 #endif
 #ifdef CONFIG_NETWORK_SECMARK
 	__u32			secmark;

include/linux/tcp.h

@@ -19,7 +19,6 @@
 
 
 #include <linux/skbuff.h>
-#include <linux/dmaengine.h>
 #include <net/sock.h>
 #include <net/inet_connection_sock.h>
 #include <net/inet_timewait_sock.h>
@@ -166,13 +165,6 @@ struct tcp_sock {
 		struct iovec		*iov;
 		int			memory;
 		int			len;
-#ifdef CONFIG_NET_DMA
-		/* members for async copy */
-		struct dma_chan		*dma_chan;
-		int			wakeup;
-		struct dma_pinned_list	*pinned_list;
-		dma_cookie_t		dma_cookie;
-#endif
 	} ucopy;
 
 	u32	snd_wl1;	/* Sequence for window update		*/

include/net/netdma.h

-/*
- * Copyright(c) 2004 - 2006 Intel Corporation. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 59
- * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
- *
- * The full GNU General Public License is included in this distribution in the
- * file called COPYING.
- */
-#ifndef NETDMA_H
-#define NETDMA_H
-#ifdef CONFIG_NET_DMA
-#include <linux/dmaengine.h>
-#include <linux/skbuff.h>
-
-int dma_skb_copy_datagram_iovec(struct dma_chan* chan,
-		struct sk_buff *skb, int offset, struct iovec *to,
-		size_t len, struct dma_pinned_list *pinned_list);
-
-#endif /* CONFIG_NET_DMA */
-#endif /* NETDMA_H */

include/net/sock.h

@@ -233,7 +233,6 @@ struct cg_proto;
   *	@sk_receive_queue: incoming packets
   *	@sk_wmem_alloc: transmit queue bytes committed
   *	@sk_write_queue: Packet sending queue
-  *	@sk_async_wait_queue: DMA copied packets
   *	@sk_omem_alloc: "o" is "option" or "other"
   *	@sk_wmem_queued: persistent queue size
   *	@sk_forward_alloc: space allocated forward
@@ -362,10 +361,6 @@ struct sock {
 	struct sk_filter __rcu	*sk_filter;
 	struct socket_wq __rcu	*sk_wq;
 
-#ifdef CONFIG_NET_DMA
-	struct sk_buff_head	sk_async_wait_queue;
-#endif
-
 #ifdef CONFIG_XFRM
 	struct xfrm_policy	*sk_policy[2];
 #endif
@@ -2206,27 +2201,15 @@ void sock_tx_timestamp(const struct sock *sk, __u8 *tx_flags);
  * sk_eat_skb - Release a skb if it is no longer needed
  * @sk: socket to eat this skb from
  * @skb: socket buffer to eat
- * @copied_early: flag indicating whether DMA operations copied this data early
  *
  * This routine must be called with interrupts disabled or with the socket
  * locked so that the sk_buff queue operation is ok.
 */
-#ifdef CONFIG_NET_DMA
-static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, bool copied_early)
-{
-	__skb_unlink(skb, &sk->sk_receive_queue);
-	if (!copied_early)
-		__kfree_skb(skb);
-	else
-		__skb_queue_tail(&sk->sk_async_wait_queue, skb);
-}
-#else
-static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, bool copied_early)
+static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb)
 {
 	__skb_unlink(skb, &sk->sk_receive_queue);
 	__kfree_skb(skb);
 }
-#endif
 
 static inline
 struct net *sock_net(const struct sock *sk)

include/net/tcp.h

@@ -27,7 +27,6 @@
 #include <linux/cache.h>
 #include <linux/percpu.h>
 #include <linux/skbuff.h>
-#include <linux/dmaengine.h>
 #include <linux/crypto.h>
 #include <linux/cryptohash.h>
 #include <linux/kref.h>
@@ -262,7 +261,6 @@ extern int sysctl_tcp_adv_win_scale;
 extern int sysctl_tcp_tw_reuse;
 extern int sysctl_tcp_frto;
 extern int sysctl_tcp_low_latency;
-extern int sysctl_tcp_dma_copybreak;
 extern int sysctl_tcp_nometrics_save;
 extern int sysctl_tcp_moderate_rcvbuf;
 extern int sysctl_tcp_tso_win_divisor;
@@ -368,7 +366,6 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
 void tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
 			 const struct tcphdr *th, unsigned int len);
 void tcp_rcv_space_adjust(struct sock *sk);
-void tcp_cleanup_rbuf(struct sock *sk, int copied);
 int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp);
 void tcp_twsk_destructor(struct sock *sk);
 ssize_t tcp_splice_read(struct socket *sk, loff_t *ppos,
@@ -1031,12 +1028,6 @@ static inline void tcp_prequeue_init(struct tcp_sock *tp)
 	tp->ucopy.len = 0;
 	tp->ucopy.memory = 0;
 	skb_queue_head_init(&tp->ucopy.prequeue);
-#ifdef CONFIG_NET_DMA
-	tp->ucopy.dma_chan = NULL;
-	tp->ucopy.wakeup = 0;
-	tp->ucopy.pinned_list = NULL;
-	tp->ucopy.dma_cookie = 0;
-#endif
 }
 
 bool tcp_prequeue(struct sock *sk, struct sk_buff *skb);

kernel/sysctl_binary.c

@@ -390,7 +390,6 @@ static const struct bin_table bin_net_ipv4_table[] = {
 	{ CTL_INT,	NET_TCP_MTU_PROBING,			"tcp_mtu_probing" },
 	{ CTL_INT,	NET_TCP_BASE_MSS,			"tcp_base_mss" },
 	{ CTL_INT,	NET_IPV4_TCP_WORKAROUND_SIGNED_WINDOWS,	"tcp_workaround_signed_windows" },
-	{ CTL_INT,	NET_TCP_DMA_COPYBREAK,			"tcp_dma_copybreak" },
 	{ CTL_INT,	NET_TCP_SLOW_START_AFTER_IDLE,		"tcp_slow_start_after_idle" },
 	{ CTL_INT,	NET_CIPSOV4_CACHE_ENABLE,		"cipso_cache_enable" },
 	{ CTL_INT,	NET_CIPSOV4_CACHE_BUCKET_SIZE,		"cipso_cache_bucket_size" },

net/core/Makefile

@@ -16,7 +16,6 @@ obj-y += net-sysfs.o
 obj-$(CONFIG_PROC_FS) += net-procfs.o
 obj-$(CONFIG_NET_PKTGEN) += pktgen.o
 obj-$(CONFIG_NETPOLL) += netpoll.o
-obj-$(CONFIG_NET_DMA) += user_dma.o
 obj-$(CONFIG_FIB_RULES) += fib_rules.o
 obj-$(CONFIG_TRACEPOINTS) += net-traces.o
 obj-$(CONFIG_NET_DROP_MONITOR) += drop_monitor.o

net/core/dev.c

@@ -1284,7 +1284,6 @@ static int __dev_open(struct net_device *dev)
 		clear_bit(__LINK_STATE_START, &dev->state);
 	else {
 		dev->flags |= IFF_UP;
-		net_dmaengine_get();
 		dev_set_rx_mode(dev);
 		dev_activate(dev);
 		add_device_randomness(dev->dev_addr, dev->addr_len);
@@ -1363,7 +1362,6 @@ static int __dev_close_many(struct list_head *head)
 			ops->ndo_stop(dev);
 
 		dev->flags &= ~IFF_UP;
-		net_dmaengine_put();
 		netpoll_poll_enable(dev);
 	}
 
@@ -4505,14 +4503,6 @@ static void net_rx_action(struct softirq_action *h)
 out:
 	net_rps_action_and_irq_enable(sd);
 
-#ifdef CONFIG_NET_DMA
-	/*
-	 * There may not be any more sk_buffs coming right now, so push
-	 * any pending DMA copies to hardware
-	 */
-	dma_issue_pending_all();
-#endif
-
 	return;
 
 softnet_break:

net/core/sock.c

@@ -1489,9 +1489,6 @@ struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
 		atomic_set(&newsk->sk_omem_alloc, 0);
 		skb_queue_head_init(&newsk->sk_receive_queue);
 		skb_queue_head_init(&newsk->sk_write_queue);
-#ifdef CONFIG_NET_DMA
-		skb_queue_head_init(&newsk->sk_async_wait_queue);
-#endif
 
 		spin_lock_init(&newsk->sk_dst_lock);
 		rwlock_init(&newsk->sk_callback_lock);
@@ -2308,9 +2305,6 @@ void sock_init_data(struct socket *sock, struct sock *sk)
 	skb_queue_head_init(&sk->sk_receive_queue);
 	skb_queue_head_init(&sk->sk_write_queue);
 	skb_queue_head_init(&sk->sk_error_queue);
-#ifdef CONFIG_NET_DMA
-	skb_queue_head_init(&sk->sk_async_wait_queue);
-#endif
 
 	sk->sk_send_head	=	NULL;
 

net/core/user_dma.c

-/*
- * Copyright(c) 2004 - 2006 Intel Corporation. All rights reserved.
- * Portions based on net/core/datagram.c and copyrighted by their authors.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 59
- * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
- *
- * The full GNU General Public License is included in this distribution in the
- * file called COPYING.
- */
-
-/*
- * This code allows the net stack to make use of a DMA engine for
- * skb to iovec copies.
- */
-
-#include <linux/dmaengine.h>
-#include <linux/socket.h>
-#include <linux/export.h>
-#include <net/tcp.h>
-#include <net/netdma.h>
-
-#define NET_DMA_DEFAULT_COPYBREAK 4096
-
-int sysctl_tcp_dma_copybreak = NET_DMA_DEFAULT_COPYBREAK;
-EXPORT_SYMBOL(sysctl_tcp_dma_copybreak);
-
-/**
- *	dma_skb_copy_datagram_iovec - Copy a datagram to an iovec.
- *	@skb - buffer to copy
- *	@offset - offset in the buffer to start copying from
- *	@iovec - io vector to copy to
- *	@len - amount of data to copy from buffer to iovec
- *	@pinned_list - locked iovec buffer data
- *
- *	Note: the iovec is modified during the copy.
- */
-int dma_skb_copy_datagram_iovec(struct dma_chan *chan,
-			struct sk_buff *skb, int offset, struct iovec *to,
-			size_t len, struct dma_pinned_list *pinned_list)
-{
-	int start = skb_headlen(skb);
-	int i, copy = start - offset;
-	struct sk_buff *frag_iter;
-	dma_cookie_t cookie = 0;
-
-	/* Copy header. */
-	if (copy > 0) {
-		if (copy > len)
-			copy = len;
-		cookie = dma_memcpy_to_iovec(chan, to, pinned_list,
-					    skb->data + offset, copy);
-		if (cookie < 0)
-			goto fault;
-		len -= copy;
-		if (len == 0)
-			goto end;
-		offset += copy;
-	}
-
-	/* Copy paged appendix. Hmm... why does this look so complicated? */
-	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);
-		copy = end - offset;
-		if (copy > 0) {
-			struct page *page = skb_frag_page(frag);
-
-			if (copy > len)
-				copy = len;
-
-			cookie = dma_memcpy_pg_to_iovec(chan, to, pinned_list, page,
-					frag->page_offset + offset - start, copy);
-			if (cookie < 0)
-				goto fault;
-			len -= copy;
-			if (len == 0)
-				goto end;
-			offset += copy;
-		}
-		start = end;
-	}
-
-	skb_walk_frags(skb, frag_iter) {
-		int end;
-
-		WARN_ON(start > offset + len);
-
-		end = start + frag_iter->len;
-		copy = end - offset;
-		if (copy > 0) {
-			if (copy > len)
-				copy = len;
-			cookie = dma_skb_copy_datagram_iovec(chan, frag_iter,
-							     offset - start,
-							     to, copy,
-							     pinned_list);
-			if (cookie < 0)
-				goto fault;
-			len -= copy;
-			if (len == 0)
-				goto end;
-			offset += copy;
-		}
-		start = end;
-	}
-
-end:
-	if (!len) {
-		skb->dma_cookie = cookie;
-		return cookie;
-	}
-
-fault:
-	return -EFAULT;
-}

net/dccp/proto.c

@@ -848,7 +848,7 @@ int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 		default:
 			dccp_pr_debug("packet_type=%s\n",
 				      dccp_packet_name(dh->dccph_type));
-			sk_eat_skb(sk, skb, false);
+			sk_eat_skb(sk, skb);
 		}
 verify_sock_status:
 		if (sock_flag(sk, SOCK_DONE)) {
@@ -905,7 +905,7 @@ int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 			len = skb->len;
 	found_fin_ok:
 		if (!(flags & MSG_PEEK))
-			sk_eat_skb(sk, skb, false);
+			sk_eat_skb(sk, skb);
 		break;
 	} while (1);
 out:

net/ipv4/sysctl_net_ipv4.c

@@ -628,15 +628,6 @@ static struct ctl_table ipv4_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec
 	},
-#ifdef CONFIG_NET_DMA
-	{
-		.procname	= "tcp_dma_copybreak",
-		.data		= &sysctl_tcp_dma_copybreak,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec
-	},
-#endif
 	{
 		.procname	= "tcp_slow_start_after_idle",
 		.data		= &sysctl_tcp_slow_start_after_idle,

net/ipv4/tcp.c

@@ -274,7 +274,6 @@
 #include <net/tcp.h>
 #include <net/xfrm.h>
 #include <net/ip.h>
-#include <net/netdma.h>
 #include <net/sock.h>
 
 #include <asm/uaccess.h>
@@ -1394,7 +1393,7 @@ static int tcp_peek_sndq(struct sock *sk, struct msghdr *msg, int len)
  * calculation of whether or not we must ACK for the sake of
  * a window update.
  */
-void tcp_cleanup_rbuf(struct sock *sk, int copied)
+static void tcp_cleanup_rbuf(struct sock *sk, int copied)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	bool time_to_ack = false;
@@ -1470,39 +1469,6 @@ static void tcp_prequeue_process(struct sock *sk)
 	tp->ucopy.memory = 0;
 }
 
-#ifdef CONFIG_NET_DMA
-static void tcp_service_net_dma(struct sock *sk, bool wait)
-{
-	dma_cookie_t done, used;
-	dma_cookie_t last_issued;
-	struct tcp_sock *tp = tcp_sk(sk);
-
-	if (!tp->ucopy.dma_chan)
-		return;
-
-	last_issued = tp->ucopy.dma_cookie;
-	dma_async_issue_pending(tp->ucopy.dma_chan);
-
-	do {
-		if (dma_async_is_tx_complete(tp->ucopy.dma_chan,
-					      last_issued, &done,
-					      &used) == DMA_COMPLETE) {
-			/* Safe to free early-copied skbs now */
-			__skb_queue_purge(&sk->sk_async_wait_queue);
-			break;
-		} else {
-			struct sk_buff *skb;
-			while ((skb = skb_peek(&sk->sk_async_wait_queue)) &&
-			       (dma_async_is_complete(skb->dma_cookie, done,
-						      used) == DMA_COMPLETE)) {
-				__skb_dequeue(&sk->sk_async_wait_queue);
-				kfree_skb(skb);
-			}
-		}
-	} while (wait);
-}
-#endif
-
 static struct sk_buff *tcp_recv_skb(struct sock *sk, u32 seq, u32 *off)
 {
 	struct sk_buff *skb;
@@ -1520,7 +1486,7 @@ static struct sk_buff *tcp_recv_skb(struct sock *sk, u32 seq, u32 *off)
 		 * splitted a fat GRO packet, while we released socket lock
 		 * in skb_splice_bits()
 		 */
-		sk_eat_skb(sk, skb, false);
+		sk_eat_skb(sk, skb);
 	}
 	return NULL;
 }
@@ -1586,11 +1552,11 @@ int tcp_read_sock(struct sock *sk, read_descriptor_t *desc,
 				continue;
 		}
 		if (tcp_hdr(skb)->fin) {
-			sk_eat_skb(sk, skb, false);
+			sk_eat_skb(sk, skb);
 			++seq;
 			break;
 		}
-		sk_eat_skb(sk, skb, false);
+		sk_eat_skb(sk, skb);
 		if (!desc->count)
 			break;
 		tp->copied_seq = seq;
@@ -1628,7 +1594,6 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 	int target;		/* Read at least this many bytes */
 	long timeo;
 	struct task_struct *user_recv = NULL;
-	bool copied_early = false;
 	struct sk_buff *skb;
 	u32 urg_hole = 0;
 
@@ -1674,28 +1639,6 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 
 	target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
 
-#ifdef CONFIG_NET_DMA
-	tp->ucopy.dma_chan = NULL;
-	preempt_disable();
-	skb = skb_peek_tail(&sk->sk_receive_queue);
-	{
-		int available = 0;
-
-		if (skb)
-			available = TCP_SKB_CB(skb)->seq + skb->len - (*seq);
-		if ((available < target) &&
-		    (len > sysctl_tcp_dma_copybreak) && !(flags & MSG_PEEK) &&
-		    !sysctl_tcp_low_latency &&
-		    net_dma_find_channel()) {
-			preempt_enable();
-			tp->ucopy.pinned_list =
-					dma_pin_iovec_pages(msg->msg_iov, len);
-		} else {
-			preempt_enable();
-		}
-	}
-#endif
-
 	do {
 		u32 offset;
 
@@ -1826,16 +1769,6 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 			/* __ Set realtime policy in scheduler __ */
 		}
 
-#ifdef CONFIG_NET_DMA
-		if (tp->ucopy.dma_chan) {
-			if (tp->rcv_wnd == 0 &&
-			    !skb_queue_empty(&sk->sk_async_wait_queue)) {
-				tcp_service_net_dma(sk, true);
-				tcp_cleanup_rbuf(sk, copied);
-			} else
-				dma_async_issue_pending(tp->ucopy.dma_chan);
-		}
-#endif
 		if (copied >= target) {
 			/* Do not sleep, just process backlog. */
 			release_sock(sk);
@@ -1843,11 +1776,6 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 		} else
 			sk_wait_data(sk, &timeo);
 
-#ifdef CONFIG_NET_DMA
-		tcp_service_net_dma(sk, false);  /* Don't block */
-		tp->ucopy.wakeup = 0;
-#endif
-
 		if (user_recv) {
 			int chunk;
 
@@ -1905,43 +1833,13 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 		}
 
 		if (!(flags & MSG_TRUNC)) {
-#ifdef CONFIG_NET_DMA
-			if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
-				tp->ucopy.dma_chan = net_dma_find_channel();
-
-			if (tp->ucopy.dma_chan) {
-				tp->ucopy.dma_cookie = dma_skb_copy_datagram_iovec(
-					tp->ucopy.dma_chan, skb, offset,
-					msg->msg_iov, used,
-					tp->ucopy.pinned_list);
-
-				if (tp->ucopy.dma_cookie < 0) {
-
-					pr_alert("%s: dma_cookie < 0\n",
-						 __func__);
-
-					/* Exception. Bailout! */
-					if (!copied)
-						copied = -EFAULT;
-					break;
-				}
-
-				dma_async_issue_pending(tp->ucopy.dma_chan);
-
-				if ((offset + used) == skb->len)
-					copied_early = true;
-
-			} else
-#endif
-			{
-				err = skb_copy_datagram_iovec(skb, offset,
-						msg->msg_iov, used);
-				if (err) {
-					/* Exception. Bailout! */
-					if (!copied)
-						copied = -EFAULT;
-					break;
-				}
+			err = skb_copy_datagram_iovec(skb, offset,
+						      msg->msg_iov, used);
+			if (err) {
+				/* Exception. Bailout! */
+				if (!copied)
+					copied = -EFAULT;
+				break;
 			}
 		}
 
@@ -1961,19 +1859,15 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 
 		if (tcp_hdr(skb)->fin)
 			goto found_fin_ok;
-		if (!(flags & MSG_PEEK)) {
-			sk_eat_skb(sk, skb, copied_early);
-			copied_early = false;
-		}
+		if (!(flags & MSG_PEEK))
+			sk_eat_skb(sk, skb);
 		continue;
 
 	found_fin_ok:
 		/* Process the FIN. */
 		++*seq;
-		if (!(flags & MSG_PEEK)) {
-			sk_eat_skb(sk, skb, copied_early);
-			copied_early = false;
-		}
+		if (!(flags & MSG_PEEK))
+			sk_eat_skb(sk, skb);
 		break;
 	} while (len > 0);
 
@@ -1996,16 +1890,6 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 		tp->ucopy.len = 0;
 	}
 
-#ifdef CONFIG_NET_DMA
-	tcp_service_net_dma(sk, true);  /* Wait for queue to drain */
-	tp->ucopy.dma_chan = NULL;
-
-	if (tp->ucopy.pinned_list) {
-		dma_unpin_iovec_pages(tp->ucopy.pinned_list);
-		tp->ucopy.pinned_list = NULL;
-	}
-#endif
-
 	/* According to UNIX98, msg_name/msg_namelen are ignored
 	 * on connected socket. I was just happy when found this 8) --ANK
 	 */
@@ -2349,9 +2233,6 @@ int tcp_disconnect(struct sock *sk, int flags)
 	__skb_queue_purge(&sk->sk_receive_queue);
 	tcp_write_queue_purge(sk);
 	__skb_queue_purge(&tp->out_of_order_queue);
-#ifdef CONFIG_NET_DMA
-	__skb_queue_purge(&sk->sk_async_wait_queue);
-#endif
 
 	inet->inet_dport = 0;
 

net/ipv4/tcp_input.c

@@ -73,7 +73,6 @@
 #include <net/inet_common.h>
 #include <linux/ipsec.h>
 #include <asm/unaligned.h>
-#include <net/netdma.h>
 #include <linux/errqueue.h>
 
 int sysctl_tcp_timestamps __read_mostly = 1;
@@ -4951,53 +4950,6 @@ static inline bool tcp_checksum_complete_user(struct sock *sk,
 	       __tcp_checksum_complete_user(sk, skb);
 }
 
-#ifdef CONFIG_NET_DMA
-static bool tcp_dma_try_early_copy(struct sock *sk, struct sk_buff *skb,
-				  int hlen)
-{
-	struct tcp_sock *tp = tcp_sk(sk);
-	int chunk = skb->len - hlen;
-	int dma_cookie;
-	bool copied_early = false;
-
-	if (tp->ucopy.wakeup)
-		return false;
-
-	if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
-		tp->ucopy.dma_chan = net_dma_find_channel();
-
-	if (tp->ucopy.dma_chan && skb_csum_unnecessary(skb)) {
-
-		dma_cookie = dma_skb_copy_datagram_iovec(tp->ucopy.dma_chan,
-							 skb, hlen,
-							 tp->ucopy.iov, chunk,
-							 tp->ucopy.pinned_list);
-
-		if (dma_cookie < 0)
-			goto out;
-
-		tp->ucopy.dma_cookie = dma_cookie;
-		copied_early = true;
-
-		tp->ucopy.len -= chunk;
-		tp->copied_seq += chunk;
-		tcp_rcv_space_adjust(sk);
-
-		if ((tp->ucopy.len == 0) ||
-		    (tcp_flag_word(tcp_hdr(skb)) & TCP_FLAG_PSH) ||
-		    (atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1))) {
-			tp->ucopy.wakeup = 1;
-			sk->sk_data_ready(sk);
-		}
-	} else if (chunk > 0) {
-		tp->ucopy.wakeup = 1;
-		sk->sk_data_ready(sk);
-	}
-out:
-	return copied_early;
-}
-#endif /* CONFIG_NET_DMA */
-
 /* Does PAWS and seqno based validation of an incoming segment, flags will
  * play significant role here.
  */
@@ -5177,27 +5129,15 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
 			}
 		} else {
 			int eaten = 0;
-			int copied_early = 0;
 			bool fragstolen = false;
 
-			if (tp->copied_seq == tp->rcv_nxt &&
-			    len - tcp_header_len <= tp->ucopy.len) {
-#ifdef CONFIG_NET_DMA
-				if (tp->ucopy.task == current &&
-				    sock_owned_by_user(sk) &&
-				    tcp_dma_try_early_copy(sk, skb, tcp_header_len)) {
-					copied_early = 1;
-					eaten = 1;
-				}
-#endif
-				if (tp->ucopy.task == current &&
-				    sock_owned_by_user(sk) && !copied_early) {
-					__set_current_state(TASK_RUNNING);
+			if (tp->ucopy.task == current &&
+			    tp->copied_seq == tp->rcv_nxt &&
+			    len - tcp_header_len <= tp->ucopy.len &&
+			    sock_owned_by_user(sk)) {
+				__set_current_state(TASK_RUNNING);
 
-					if (!tcp_copy_to_iovec(sk, skb, tcp_header_len))
-						eaten = 1;
-				}
-				if (eaten) {
+				if (!tcp_copy_to_iovec(sk, skb, tcp_header_len)) {
 					/* Predicted packet is in window by definition.
 					 * seq == rcv_nxt and rcv_wup <= rcv_nxt.
 					 * Hence, check seq<=rcv_wup reduces to:
@@ -5213,9 +5153,8 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
 					__skb_pull(skb, tcp_header_len);
 					tp->rcv_nxt = TCP_SKB_CB(skb)->end_seq;
 					NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPHPHITSTOUSER);
+					eaten = 1;
 				}
-				if (copied_early)
-					tcp_cleanup_rbuf(sk, skb->len);
 			}
 			if (!eaten) {
 				if (tcp_checksum_complete_user(sk, skb))
@@ -5252,14 +5191,8 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
 					goto no_ack;
 			}
 
-			if (!copied_early || tp->rcv_nxt != tp->rcv_wup)
-				__tcp_ack_snd_check(sk, 0);
+			__tcp_ack_snd_check(sk, 0);
 no_ack:
-#ifdef CONFIG_NET_DMA
-			if (copied_early)
-				__skb_queue_tail(&sk->sk_async_wait_queue, skb);
-			else
-#endif
 			if (eaten)
 				kfree_skb_partial(skb, fragstolen);
 			sk->sk_data_ready(sk);

net/ipv4/tcp_ipv4.c

@@ -72,7 +72,6 @@
 #include <net/inet_common.h>
 #include <net/timewait_sock.h>
 #include <net/xfrm.h>
-#include <net/netdma.h>
 #include <net/secure_seq.h>
 #include <net/tcp_memcontrol.h>
 #include <net/busy_poll.h>
@@ -1670,18 +1669,8 @@ int tcp_v4_rcv(struct sk_buff *skb)
 	bh_lock_sock_nested(sk);
 	ret = 0;
 	if (!sock_owned_by_user(sk)) {
-#ifdef CONFIG_NET_DMA
-		struct tcp_sock *tp = tcp_sk(sk);
-		if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
-			tp->ucopy.dma_chan = net_dma_find_channel();
-		if (tp->ucopy.dma_chan)
+		if (!tcp_prequeue(sk, skb))
 			ret = tcp_v4_do_rcv(sk, skb);
-		else
-#endif
-		{
-			if (!tcp_prequeue(sk, skb))
-				ret = tcp_v4_do_rcv(sk, skb);
-		}
 	} else if (unlikely(sk_add_backlog(sk, skb,
 					   sk->sk_rcvbuf + sk->sk_sndbuf))) {
 		bh_unlock_sock(sk);
@@ -1841,11 +1830,6 @@ void tcp_v4_destroy_sock(struct sock *sk)
 	}
 #endif
 
-#ifdef CONFIG_NET_DMA
-	/* Cleans up our sk_async_wait_queue */
-	__skb_queue_purge(&sk->sk_async_wait_queue);
-#endif
-
 	/* Clean prequeue, it must be empty really */
 	__skb_queue_purge(&tp->ucopy.prequeue);
 

net/ipv6/tcp_ipv6.c

@@ -59,7 +59,6 @@
 #include <net/snmp.h>
 #include <net/dsfield.h>
 #include <net/timewait_sock.h>
-#include <net/netdma.h>
 #include <net/inet_common.h>
 #include <net/secure_seq.h>
 #include <net/tcp_memcontrol.h>
@@ -1446,18 +1445,8 @@ static int tcp_v6_rcv(struct sk_buff *skb)
 	bh_lock_sock_nested(sk);
 	ret = 0;
 	if (!sock_owned_by_user(sk)) {
-#ifdef CONFIG_NET_DMA
-		struct tcp_sock *tp = tcp_sk(sk);
-		if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
-			tp->ucopy.dma_chan = net_dma_find_channel();
-		if (tp->ucopy.dma_chan)
+		if (!tcp_prequeue(sk, skb))
 			ret = tcp_v6_do_rcv(sk, skb);
-		else
-#endif
-		{
-			if (!tcp_prequeue(sk, skb))
-				ret = tcp_v6_do_rcv(sk, skb);
-		}
 	} else if (unlikely(sk_add_backlog(sk, skb,
 					   sk->sk_rcvbuf + sk->sk_sndbuf))) {
 		bh_unlock_sock(sk);

net/llc/af_llc.c

@@ -839,7 +839,7 @@ static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock,
 
 		if (!(flags & MSG_PEEK)) {
 			spin_lock_irqsave(&sk->sk_receive_queue.lock, cpu_flags);
-			sk_eat_skb(sk, skb, false);
+			sk_eat_skb(sk, skb);
 			spin_unlock_irqrestore(&sk->sk_receive_queue.lock, cpu_flags);
 			*seq = 0;
 		}
@@ -861,10 +861,10 @@ static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock,
 		llc_cmsg_rcv(msg, skb);
 
 	if (!(flags & MSG_PEEK)) {
-			spin_lock_irqsave(&sk->sk_receive_queue.lock, cpu_flags);
-			sk_eat_skb(sk, skb, false);
-			spin_unlock_irqrestore(&sk->sk_receive_queue.lock, cpu_flags);
-			*seq = 0;
+		spin_lock_irqsave(&sk->sk_receive_queue.lock, cpu_flags);
+		sk_eat_skb(sk, skb);
+		spin_unlock_irqrestore(&sk->sk_receive_queue.lock, cpu_flags);
+		*seq = 0;
 	}
 
 	goto out;