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bc96b052d5bbd7f4bd2bf3f2b92c927bfbb796f2
scst/iscsi-scst/kernel/patches/put_page_callback-2.6.29.patch
Vladislav Bolkhovitin bc96b052d5 The patch below adds support for the 2.6.29 kernel and also fixes the 
checkpatch issues reported by the checkpatch script included with the 2.6.29
kernel and that were not yet reported by the 2.6.28 checkpatch script
(trailing statements should be on the next line / struct should normally be
const).
The patch below has been tested as follows:
- Reran scripts/run-regression-tests -k 2.6.24.7 -k 2.6.25.20 -k 2.6.26.8 -k 2.6.27.21 -k 2.6.28.9 -k 2.6.29 and verified the output.
- Rebuilt, installed and loaded scst, iscsi-scst and srpt as follows:
make -s clean && make -s -C scst install && make -s -C iscsi-scst install && make -s -C srpt install && cd scstadmin && make -s && make -s install && modprobe scst_vdisk && modprobe iscsi-scst && dmesg

Signed-off-by: Bart Van Assche <bart.vanassche@gmail.com>

with minor cleanups and corrections in put_page_callback-2.6.29.patch



git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@717 d57e44dd-8a1f-0410-8b47-8ef2f437770f
2009-03-25 12:55:27 +00:00

361 lines
12 KiB
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diff -upkr linux-2.6.29/include/linux/mm_types.h linux-2.6.29/include/linux/mm_types.h
--- linux-2.6.29/include/linux/mm_types.h 2009-03-24 02:12:14.000000000 +0300
+++ linux-2.6.29/include/linux/mm_types.h 2009-03-25 12:13:18.000000000 +0300
@@ -94,6 +94,18 @@ struct page {
void *virtual; /* Kernel virtual address (NULL if
not kmapped, ie. highmem) */
#endif /* WANT_PAGE_VIRTUAL */
+
+#if defined(CONFIG_TCP_ZERO_COPY_TRANSFER_COMPLETION_NOTIFICATION)
+ /*
+ * Used to implement support for notification on zero-copy TCP transfer
+ * completion. It might look as not good to have this field here and
+ * it's better to have it in struct sk_buff, but it would make the code
+ * much more complicated and fragile, since all skb then would have to
+ * contain only pages with the same value in this field.
+ */
+ void *net_priv;
+#endif
+
};
/*
diff -upkr linux-2.6.29/include/linux/net.h linux-2.6.29/include/linux/net.h
--- linux-2.6.29/include/linux/net.h 2009-03-24 02:12:14.000000000 +0300
+++ linux-2.6.29/include/linux/net.h 2009-03-25 12:13:18.000000000 +0300
@@ -57,6 +57,7 @@ typedef enum {
#include <linux/random.h>
#include <linux/wait.h>
#include <linux/fcntl.h> /* For O_CLOEXEC and O_NONBLOCK */
+#include <linux/mm.h>
struct poll_table_struct;
struct pipe_inode_info;
@@ -352,5 +353,44 @@ static const struct proto_ops name##_ops
extern struct ratelimit_state net_ratelimit_state;
#endif
+#if defined(CONFIG_TCP_ZERO_COPY_TRANSFER_COMPLETION_NOTIFICATION)
+/* Support for notification on zero-copy TCP transfer completion */
+typedef void (*net_get_page_callback_t)(struct page *page);
+typedef void (*net_put_page_callback_t)(struct page *page);
+
+extern net_get_page_callback_t net_get_page_callback;
+extern net_put_page_callback_t net_put_page_callback;
+
+extern int net_set_get_put_page_callbacks(
+ net_get_page_callback_t get_callback,
+ net_put_page_callback_t put_callback);
+
+/*
+ * See comment for net_set_get_put_page_callbacks() why those functions
+ * don't need any protection.
+ */
+static inline void net_get_page(struct page *page)
+{
+ if (page->net_priv != 0)
+ net_get_page_callback(page);
+ get_page(page);
+}
+static inline void net_put_page(struct page *page)
+{
+ if (page->net_priv != 0)
+ net_put_page_callback(page);
+ put_page(page);
+}
+#else
+static inline void net_get_page(struct page *page)
+{
+ get_page(page);
+}
+static inline void net_put_page(struct page *page)
+{
+ put_page(page);
+}
+#endif /* CONFIG_TCP_ZERO_COPY_TRANSFER_COMPLETION_NOTIFICATION */
+
#endif /* __KERNEL__ */
#endif /* _LINUX_NET_H */
diff -upkr linux-2.6.29/net/core/skbuff.c linux-2.6.29/net/core/skbuff.c
--- linux-2.6.29/net/core/skbuff.c 2009-03-24 02:12:14.000000000 +0300
+++ linux-2.6.29/net/core/skbuff.c 2009-03-25 13:57:33.000000000 +0300
@@ -73,13 +73,13 @@ static struct kmem_cache *skbuff_fclone_
static void sock_pipe_buf_release(struct pipe_inode_info *pipe,
struct pipe_buffer *buf)
{
- put_page(buf->page);
+ net_put_page(buf->page);
}
static void sock_pipe_buf_get(struct pipe_inode_info *pipe,
struct pipe_buffer *buf)
{
- get_page(buf->page);
+ net_get_page(buf->page);
}
static int sock_pipe_buf_steal(struct pipe_inode_info *pipe,
@@ -327,7 +327,7 @@ static void skb_release_data(struct sk_b
if (skb_shinfo(skb)->nr_frags) {
int i;
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
- put_page(skb_shinfo(skb)->frags[i].page);
+ net_put_page(skb_shinfo(skb)->frags[i].page);
}
if (skb_shinfo(skb)->frag_list)
@@ -716,7 +716,7 @@ struct sk_buff *pskb_copy(struct sk_buff
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
skb_shinfo(n)->frags[i] = skb_shinfo(skb)->frags[i];
- get_page(skb_shinfo(n)->frags[i].page);
+ net_get_page(skb_shinfo(n)->frags[i].page);
}
skb_shinfo(n)->nr_frags = i;
}
@@ -781,7 +781,7 @@ int pskb_expand_head(struct sk_buff *skb
sizeof(struct skb_shared_info));
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
- get_page(skb_shinfo(skb)->frags[i].page);
+ net_get_page(skb_shinfo(skb)->frags[i].page);
if (skb_shinfo(skb)->frag_list)
skb_clone_fraglist(skb);
@@ -1050,7 +1050,7 @@ drop_pages:
skb_shinfo(skb)->nr_frags = i;
for (; i < nfrags; i++)
- put_page(skb_shinfo(skb)->frags[i].page);
+ net_put_page(skb_shinfo(skb)->frags[i].page);
if (skb_shinfo(skb)->frag_list)
skb_drop_fraglist(skb);
@@ -1219,7 +1219,7 @@ pull_pages:
k = 0;
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
if (skb_shinfo(skb)->frags[i].size <= eat) {
- put_page(skb_shinfo(skb)->frags[i].page);
+ net_put_page(skb_shinfo(skb)->frags[i].page);
eat -= skb_shinfo(skb)->frags[i].size;
} else {
skb_shinfo(skb)->frags[k] = skb_shinfo(skb)->frags[i];
@@ -1322,7 +1322,7 @@ fault:
*/
static void sock_spd_release(struct splice_pipe_desc *spd, unsigned int i)
{
- put_page(spd->pages[i]);
+ net_put_page(spd->pages[i]);
}
static inline struct page *linear_to_page(struct page *page, unsigned int len,
@@ -1352,7 +1352,7 @@ static inline int spd_fill_page(struct s
if (!page)
return 1;
} else
- get_page(page);
+ net_get_page(page);
spd->pages[spd->nr_pages] = page;
spd->partial[spd->nr_pages].len = len;
@@ -1977,7 +1977,7 @@ static inline void skb_split_no_header(s
* where splitting is expensive.
* 2. Split is accurately. We make this.
*/
- get_page(skb_shinfo(skb)->frags[i].page);
+ net_get_page(skb_shinfo(skb)->frags[i].page);
skb_shinfo(skb1)->frags[0].page_offset += len - pos;
skb_shinfo(skb1)->frags[0].size -= len - pos;
skb_shinfo(skb)->frags[i].size = len - pos;
@@ -2098,7 +2098,7 @@ int skb_shift(struct sk_buff *tgt, struc
to++;
} else {
- get_page(fragfrom->page);
+ net_get_page(fragfrom->page);
fragto->page = fragfrom->page;
fragto->page_offset = fragfrom->page_offset;
fragto->size = todo;
@@ -2120,7 +2120,7 @@ int skb_shift(struct sk_buff *tgt, struc
fragto = &skb_shinfo(tgt)->frags[merge];
fragto->size += fragfrom->size;
- put_page(fragfrom->page);
+ net_put_page(fragfrom->page);
}
/* Reposition in the original skb */
@@ -2514,7 +2514,7 @@ struct sk_buff *skb_segment(struct sk_bu
while (pos < offset + len && i < nfrags) {
*frag = skb_shinfo(skb)->frags[i];
- get_page(frag->page);
+ net_get_page(frag->page);
size = frag->size;
if (pos < offset) {
diff -upkr linux-2.6.29/net/ipv4/ip_output.c linux-2.6.29/net/ipv4/ip_output.c
--- linux-2.6.29/net/ipv4/ip_output.c 2009-03-24 02:12:14.000000000 +0300
+++ linux-2.6.29/net/ipv4/ip_output.c 2009-03-25 12:13:18.000000000 +0300
@@ -1013,7 +1013,7 @@ alloc_new_skb:
err = -EMSGSIZE;
goto error;
}
- get_page(page);
+ net_get_page(page);
skb_fill_page_desc(skb, i, page, sk->sk_sndmsg_off, 0);
frag = &skb_shinfo(skb)->frags[i];
}
@@ -1171,7 +1171,7 @@ ssize_t ip_append_page(struct sock *sk,
if (skb_can_coalesce(skb, i, page, offset)) {
skb_shinfo(skb)->frags[i-1].size += len;
} else if (i < MAX_SKB_FRAGS) {
- get_page(page);
+ net_get_page(page);
skb_fill_page_desc(skb, i, page, offset, len);
} else {
err = -EMSGSIZE;
diff -upkr linux-2.6.29/net/ipv4/Makefile linux-2.6.29/net/ipv4/Makefile
--- linux-2.6.29/net/ipv4/Makefile 2009-03-24 02:12:14.000000000 +0300
+++ linux-2.6.29/net/ipv4/Makefile 2009-03-25 12:13:18.000000000 +0300
@@ -49,6 +49,7 @@ obj-$(CONFIG_TCP_CONG_LP) += tcp_lp.o
obj-$(CONFIG_TCP_CONG_YEAH) += tcp_yeah.o
obj-$(CONFIG_TCP_CONG_ILLINOIS) += tcp_illinois.o
obj-$(CONFIG_NETLABEL) += cipso_ipv4.o
+obj-$(CONFIG_TCP_ZERO_COPY_TRANSFER_COMPLETION_NOTIFICATION) += tcp_zero_copy.o
obj-$(CONFIG_XFRM) += xfrm4_policy.o xfrm4_state.o xfrm4_input.o \
xfrm4_output.o
diff -upkr linux-2.6.29/net/ipv4/tcp.c linux-2.6.29/net/ipv4/tcp.c
--- linux-2.6.29/net/ipv4/tcp.c 2009-03-24 02:12:14.000000000 +0300
+++ linux-2.6.29/net/ipv4/tcp.c 2009-03-25 12:13:18.000000000 +0300
@@ -720,7 +720,7 @@ new_segment:
if (can_coalesce) {
skb_shinfo(skb)->frags[i - 1].size += copy;
} else {
- get_page(page);
+ net_get_page(page);
skb_fill_page_desc(skb, i, page, offset, copy);
}
@@ -925,7 +925,7 @@ new_segment:
goto new_segment;
} else if (page) {
if (off == PAGE_SIZE) {
- put_page(page);
+ net_put_page(page);
TCP_PAGE(sk) = page = NULL;
off = 0;
}
@@ -966,9 +966,9 @@ new_segment:
} else {
skb_fill_page_desc(skb, i, page, off, copy);
if (TCP_PAGE(sk)) {
- get_page(page);
+ net_get_page(page);
} else if (off + copy < PAGE_SIZE) {
- get_page(page);
+ net_get_page(page);
TCP_PAGE(sk) = page;
}
}
diff -upkr linux-2.6.29/net/ipv4/tcp_output.c linux-2.6.29/net/ipv4/tcp_output.c
--- linux-2.6.29/net/ipv4/tcp_output.c 2009-03-24 02:12:14.000000000 +0300
+++ linux-2.6.29/net/ipv4/tcp_output.c 2009-03-25 12:13:18.000000000 +0300
@@ -871,7 +871,7 @@ static void __pskb_trim_head(struct sk_b
k = 0;
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
if (skb_shinfo(skb)->frags[i].size <= eat) {
- put_page(skb_shinfo(skb)->frags[i].page);
+ net_put_page(skb_shinfo(skb)->frags[i].page);
eat -= skb_shinfo(skb)->frags[i].size;
} else {
skb_shinfo(skb)->frags[k] = skb_shinfo(skb)->frags[i];
diff -upkr linux-2.6.29/net/ipv4/tcp_zero_copy.c linux-2.6.29/net/ipv4/tcp_zero_copy.c
--- linux-2.6.29/net/ipv4/tcp_zero_copy.c 2009-03-25 14:03:29.000000000 +0300
+++ linux-2.6.29/net/ipv4/tcp_zero_copy.c 2009-03-25 12:13:18.000000000 +0300
@@ -0,0 +1,49 @@
+/*
+ * Support routines for TCP zero copy transmit
+ *
+ * Created by Vladislav Bolkhovitin
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ */
+
+#include <linux/skbuff.h>
+
+net_get_page_callback_t net_get_page_callback __read_mostly;
+EXPORT_SYMBOL(net_get_page_callback);
+
+net_put_page_callback_t net_put_page_callback __read_mostly;
+EXPORT_SYMBOL(net_put_page_callback);
+
+/*
+ * Caller of this function must ensure that at the moment when it's called
+ * there are no pages in the system with net_priv field set to non-zero
+ * value. Hence, this function, as well as net_get_page() and net_put_page(),
+ * don't need any protection.
+ */
+int net_set_get_put_page_callbacks(
+ net_get_page_callback_t get_callback,
+ net_put_page_callback_t put_callback)
+{
+ int res = 0;
+
+ if ((net_get_page_callback != NULL) && (get_callback != NULL) &&
+ (net_get_page_callback != get_callback)) {
+ res = -EBUSY;
+ goto out;
+ }
+
+ if ((net_put_page_callback != NULL) && (put_callback != NULL) &&
+ (net_put_page_callback != put_callback)) {
+ res = -EBUSY;
+ goto out;
+ }
+
+ net_get_page_callback = get_callback;
+ net_put_page_callback = put_callback;
+
+out:
+ return res;
+}
+EXPORT_SYMBOL(net_set_get_put_page_callbacks);
diff -upkr linux-2.6.29/net/ipv6/ip6_output.c linux-2.6.29/net/ipv6/ip6_output.c
--- linux-2.6.29/net/ipv6/ip6_output.c 2009-03-24 02:12:14.000000000 +0300
+++ linux-2.6.29/net/ipv6/ip6_output.c 2009-03-25 12:13:18.000000000 +0300
@@ -1394,7 +1394,7 @@ alloc_new_skb:
err = -EMSGSIZE;
goto error;
}
- get_page(page);
+ net_get_page(page);
skb_fill_page_desc(skb, i, page, sk->sk_sndmsg_off, 0);
frag = &skb_shinfo(skb)->frags[i];
}
diff -upkr linux-2.6.29/net/Kconfig linux-2.6.29/net/Kconfig
--- linux-2.6.29/net/Kconfig 2009-03-24 02:12:14.000000000 +0300
+++ linux-2.6.29/net/Kconfig 2009-03-25 12:13:18.000000000 +0300
@@ -54,6 +54,18 @@ config INET
Short answer: say Y.
+config TCP_ZERO_COPY_TRANSFER_COMPLETION_NOTIFICATION
+ bool "TCP/IP zero-copy transfer completion notification"
+ depends on INET
+ default SCST_ISCSI
+ ---help---
+ Adds support for sending a notification upon completion of a
+ zero-copy TCP/IP transfer. This can speed up certain TCP/IP
+ software. Currently this is only used by the iSCSI target driver
+ iSCSI-SCST.
+
+ If unsure, say N.
+
if INET
source "net/ipv4/Kconfig"
source "net/ipv6/Kconfig"
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