[PATCH 3.13 059/105] net_dma: simple removal

Kamal Mostafa
2014-10-27T19:00:42Z

From: Dan Williams <dan.j.williams@intel.com>

commit 7bced397510ab569d31de4c70b39e13355046387 upstream.

Per commit "77873803363c net_dma: mark broken" net_dma is no longer used
and there is no plan to fix it.

This is the mechanical removal of bits in CONFIG_NET_DMA ifdef guards.
Reverting the remainder of the net_dma induced changes is deferred to
subsequent patches.

Marked for stable due to Roman's report of a memory leak in
dma_pin_iovec_pages():

https://lkml.org/lkml/2014/9/3/177

Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: David Whipple <whipple@securedatainnovations.ch>
Cc: Alexander Duyck <alexander.h.duyck@intel.com>
Reported-by: Roman Gushchin <klamm@yandex-team.ru>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
Documentation/ABI/removed/net_dma | 8 +
Documentation/networking/ip-sysctl.txt | 6 -
drivers/dma/Kconfig | 12 --
drivers/dma/Makefile | 1 -
drivers/dma/dmaengine.c | 104 ------------
drivers/dma/ioat/dma.c | 1 -
drivers/dma/ioat/dma.h | 7 -
drivers/dma/ioat/dma_v2.c | 1 -
drivers/dma/ioat/dma_v3.c | 1 -
drivers/dma/iovlock.c | 280 ---------------------------------
include/linux/dmaengine.h | 22 +--
include/linux/skbuff.h | 8 +-
include/linux/tcp.h | 8 -
include/net/netdma.h | 32 ----
include/net/sock.h | 19 +--
include/net/tcp.h | 8 -
kernel/sysctl_binary.c | 1 -
net/core/Makefile | 1 -
net/core/dev.c | 10 --
net/core/sock.c | 6 -
net/core/user_dma.c | 131 ---------------
net/dccp/proto.c | 4 +-
net/ipv4/sysctl_net_ipv4.c | 9 --
net/ipv4/tcp.c | 147 ++---------------
net/ipv4/tcp_input.c | 61 -------
net/ipv4/tcp_ipv4.c | 18 +--
net/ipv6/tcp_ipv6.c | 13 +-
net/llc/af_llc.c | 10 +-
28 files changed, 35 insertions(+), 894 deletions(-)
create mode 100644 Documentation/ABI/removed/net_dma
delete mode 100644 drivers/dma/iovlock.c
delete mode 100644 include/net/netdma.h
delete mode 100644 net/core/user_dma.c

diff --git a/Documentation/ABI/removed/net_dma b/Documentation/ABI/removed/net_dma
new file mode 100644
index 0000000..a173aec
--- /dev/null
+++ b/Documentation/ABI/removed/net_dma
@@ -0,0 +1,8 @@
+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.
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 8a984e9..b4be7fd 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -542,12 +542,6 @@ 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
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index c823daa..b24f131 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -351,18 +351,6 @@ 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
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index 0ce2da9..024b008 100644
--- a/drivers/dma/Makefile
+++ b/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/
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index b4c711d..4fd4269 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -1031,110 +1031,6 @@ 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)
{
diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
index 4e3549a..c1bceee 100644
--- a/drivers/dma/ioat/dma.c
+++ b/drivers/dma/ioat/dma.c
@@ -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;
diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h
index e982f00..d63f68b 100644
--- a/drivers/dma/ioat/dma.h
+++ b/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)
{
diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c
index 8d10580..83169b6 100644
--- a/drivers/dma/ioat/dma_v2.c
+++ b/drivers/dma/ioat/dma_v2.c
@@ -899,7 +899,6 @@ 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);
diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c
index b9b38a1..d057372 100644
--- a/drivers/dma/ioat/dma_v3.c
+++ b/drivers/dma/ioat/dma_v3.c
@@ -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);
diff --git a/drivers/dma/iovlock.c b/drivers/dma/iovlock.c
deleted file mode 100644
index bb48a57..0000000
--- a/drivers/dma/iovlock.c
+++ /dev/null
@@ -1,280 +0,0 @@
-/*
- * 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;
-}
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index ed6c1f1..acf5c78 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -876,18 +876,6 @@ 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()
@@ -909,16 +897,8 @@ 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)
{
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 37cb679..1389001 100644
--- a/include/linux/skbuff.h
+++ b/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>
@@ -496,11 +495,8 @@ struct sk_buff {
/* 6/8 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;
diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index d686334..26f1602 100644
--- a/include/linux/tcp.h
+++ b/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>
@@ -169,13 +168,6 @@ 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 */
diff --git a/include/net/netdma.h b/include/net/netdma.h
deleted file mode 100644
index 8ba8ce2..0000000
--- a/include/net/netdma.h
+++ /dev/null
@@ -1,32 +0,0 @@
-/*
- * 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 */
diff --git a/include/net/sock.h b/include/net/sock.h
index 4d64744..749bad5 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -231,7 +231,6 @@ 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
@@ -354,10 +353,6 @@ 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
@@ -2203,27 +2198,15 @@ void sock_tx_timestamp(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)
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 197b020..920fc2e 100644
--- a/include/net/tcp.h
+++ b/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>
@@ -267,7 +266,6 @@ 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;
@@ -1033,12 +1031,6 @@ 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);
diff --git a/kernel/sysctl_binary.c b/kernel/sysctl_binary.c
index 653cbbd..d457005 100644
--- a/kernel/sysctl_binary.c
+++ b/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" },
diff --git a/net/core/Makefile b/net/core/Makefile
index b33b996..5f98e59 100644
--- a/net/core/Makefile
+++ b/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
diff --git a/net/core/dev.c b/net/core/dev.c
index e61bda3..65c5438 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1266,7 +1266,6 @@ 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);
@@ -1342,7 +1341,6 @@ static int __dev_close_many(struct list_head *head)
ops->ndo_stop(dev);

dev->flags &= ~IFF_UP;
- net_dmaengine_put();
}

return 0;
@@ -4375,14 +4373,6 @@ 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:
diff --git a/net/core/sock.c b/net/core/sock.c
index 1ed4266..ee847676 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1510,9 +1510,6 @@ 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);
@@ -2341,9 +2338,6 @@ 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;

diff --git a/net/core/user_dma.c b/net/core/user_dma.c
deleted file mode 100644
index 1b5fefd..0000000
--- a/net/core/user_dma.c
+++ /dev/null
@@ -1,131 +0,0 @@
-/*
- * 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;
-}
diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index eb892b4..f9076f2 100644
--- a/net/dccp/proto.c
+++ b/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 @@ verify_sock_status:
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:
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 3d69ec8..79a90b9 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -642,15 +642,6 @@ 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,
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index c200b34..e7a02d8 100644
--- a/net/ipv4/tcp.c
+++ b/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>
@@ -1412,39 +1411,6 @@ 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;
@@ -1462,7 +1428,7 @@ 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;
}
@@ -1528,11 +1494,11 @@ 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;
@@ -1570,7 +1536,6 @@ 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;

@@ -1613,28 +1578,6 @@ 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_no_resched();
- tp->ucopy.pinned_list =
- dma_pin_iovec_pages(msg->msg_iov, len);
- } else {
- preempt_enable_no_resched();
- }
- }
-#endif
-
do {
u32 offset;

@@ -1765,16 +1708,6 @@ 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);
@@ -1782,11 +1715,6 @@ 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;

@@ -1844,43 +1772,13 @@ do_prequeue:
}

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;
}
}

@@ -1900,19 +1798,15 @@ skip_copy:

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);

@@ -1935,16 +1829,6 @@ skip_copy:
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
*/
@@ -2288,9 +2172,6 @@ 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;

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 53d60b4..abd367b 100644
--- a/net/ipv4/tcp_input.c
+++ b/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>

int sysctl_tcp_timestamps __read_mostly = 1;
int sysctl_tcp_window_scaling __read_mostly = 1;
@@ -4966,53 +4965,6 @@ 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, 0);
- }
- } else if (chunk > 0) {
- tp->ucopy.wakeup = 1;
- sk->sk_data_ready(sk, 0);
- }
-out:
- return copied_early;
-}
-#endif /* CONFIG_NET_DMA */
-
/* Does PAWS and seqno based validation of an incoming segment, flags will
* play significant role here.
*/
@@ -5197,14 +5149,6 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb,

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);
@@ -5270,11 +5214,6 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
if (!copied_early || tp->rcv_nxt != tp->rcv_wup)
__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, 0);
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 1d7b9dd..77fe507 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/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>
@@ -2000,18 +1999,8 @@ process:
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);
@@ -2170,11 +2159,6 @@ 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);

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index f67033b..282874b 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/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>
@@ -1503,18 +1502,8 @@ process:
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);
diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c
index c71b699..78b9734 100644
--- a/net/llc/af_llc.c
+++ b/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 @@ copy_uaddr:
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;
--
1.9.1