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-rw-r--r--net/rds/page.c167
1 files changed, 167 insertions, 0 deletions
diff --git a/net/rds/page.c b/net/rds/page.c
new file mode 100644
index 0000000000..7cc57e098d
--- /dev/null
+++ b/net/rds/page.c
@@ -0,0 +1,167 @@
+/*
+ * Copyright (c) 2006 Oracle. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+#include <linux/highmem.h>
+#include <linux/gfp.h>
+#include <linux/cpu.h>
+#include <linux/export.h>
+
+#include "rds.h"
+
+struct rds_page_remainder {
+ struct page *r_page;
+ unsigned long r_offset;
+};
+
+static
+DEFINE_PER_CPU_SHARED_ALIGNED(struct rds_page_remainder, rds_page_remainders);
+
+/**
+ * rds_page_remainder_alloc - build up regions of a message.
+ *
+ * @scat: Scatter list for message
+ * @bytes: the number of bytes needed.
+ * @gfp: the waiting behaviour of the allocation
+ *
+ * @gfp is always ored with __GFP_HIGHMEM. Callers must be prepared to
+ * kmap the pages, etc.
+ *
+ * If @bytes is at least a full page then this just returns a page from
+ * alloc_page().
+ *
+ * If @bytes is a partial page then this stores the unused region of the
+ * page in a per-cpu structure. Future partial-page allocations may be
+ * satisfied from that cached region. This lets us waste less memory on
+ * small allocations with minimal complexity. It works because the transmit
+ * path passes read-only page regions down to devices. They hold a page
+ * reference until they are done with the region.
+ */
+int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes,
+ gfp_t gfp)
+{
+ struct rds_page_remainder *rem;
+ unsigned long flags;
+ struct page *page;
+ int ret;
+
+ gfp |= __GFP_HIGHMEM;
+
+ /* jump straight to allocation if we're trying for a huge page */
+ if (bytes >= PAGE_SIZE) {
+ page = alloc_page(gfp);
+ if (!page) {
+ ret = -ENOMEM;
+ } else {
+ sg_set_page(scat, page, PAGE_SIZE, 0);
+ ret = 0;
+ }
+ goto out;
+ }
+
+ rem = &per_cpu(rds_page_remainders, get_cpu());
+ local_irq_save(flags);
+
+ while (1) {
+ /* avoid a tiny region getting stuck by tossing it */
+ if (rem->r_page && bytes > (PAGE_SIZE - rem->r_offset)) {
+ rds_stats_inc(s_page_remainder_miss);
+ __free_page(rem->r_page);
+ rem->r_page = NULL;
+ }
+
+ /* hand out a fragment from the cached page */
+ if (rem->r_page && bytes <= (PAGE_SIZE - rem->r_offset)) {
+ sg_set_page(scat, rem->r_page, bytes, rem->r_offset);
+ get_page(sg_page(scat));
+
+ if (rem->r_offset != 0)
+ rds_stats_inc(s_page_remainder_hit);
+
+ rem->r_offset += ALIGN(bytes, 8);
+ if (rem->r_offset >= PAGE_SIZE) {
+ __free_page(rem->r_page);
+ rem->r_page = NULL;
+ }
+ ret = 0;
+ break;
+ }
+
+ /* alloc if there is nothing for us to use */
+ local_irq_restore(flags);
+ put_cpu();
+
+ page = alloc_page(gfp);
+
+ rem = &per_cpu(rds_page_remainders, get_cpu());
+ local_irq_save(flags);
+
+ if (!page) {
+ ret = -ENOMEM;
+ break;
+ }
+
+ /* did someone race to fill the remainder before us? */
+ if (rem->r_page) {
+ __free_page(page);
+ continue;
+ }
+
+ /* otherwise install our page and loop around to alloc */
+ rem->r_page = page;
+ rem->r_offset = 0;
+ }
+
+ local_irq_restore(flags);
+ put_cpu();
+out:
+ rdsdebug("bytes %lu ret %d %p %u %u\n", bytes, ret,
+ ret ? NULL : sg_page(scat), ret ? 0 : scat->offset,
+ ret ? 0 : scat->length);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(rds_page_remainder_alloc);
+
+void rds_page_exit(void)
+{
+ unsigned int cpu;
+
+ for_each_possible_cpu(cpu) {
+ struct rds_page_remainder *rem;
+
+ rem = &per_cpu(rds_page_remainders, cpu);
+ rdsdebug("cpu %u\n", cpu);
+
+ if (rem->r_page)
+ __free_page(rem->r_page);
+ rem->r_page = NULL;
+ }
+}