X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=drivers%2Fnet%2Fxenvirt%2Frte_mempool_gntalloc.c;fp=drivers%2Fnet%2Fxenvirt%2Frte_mempool_gntalloc.c;h=7bfbfda3a132dd25aa74785d56dffe34a2dab530;hb=97f17497d162afdb82c8704bf097f0fee3724b2e;hp=0000000000000000000000000000000000000000;hpb=e04be89c2409570e0055b2cda60bd11395bb93b0;p=deb_dpdk.git

diff --git a/drivers/net/xenvirt/rte_mempool_gntalloc.c b/drivers/net/xenvirt/rte_mempool_gntalloc.c
new file mode 100644
index 00000000..7bfbfda3
--- /dev/null
+++ b/drivers/net/xenvirt/rte_mempool_gntalloc.c
@@ -0,0 +1,295 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   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.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdint.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <sys/ioctl.h>
+#include <string.h>
+#include <xen/sys/gntalloc.h>
+
+#include <rte_common.h>
+#include <rte_mempool.h>
+#include <rte_memory.h>
+#include <rte_errno.h>
+
+#include "rte_xen_lib.h"
+#include "rte_eth_xenvirt.h"
+
+struct _gntarr {
+	uint32_t gref;
+	phys_addr_t pa;
+	uint64_t index;
+	void *va;
+};
+
+struct _mempool_gntalloc_info {
+	struct rte_mempool *mp;
+	uint32_t pg_num;
+	uint32_t *gref_arr;
+	phys_addr_t *pa_arr;
+	void *va;
+	uint32_t mempool_idx;
+	uint64_t start_index;
+};
+
+
+static rte_atomic32_t global_xenvirt_mempool_idx = RTE_ATOMIC32_INIT(-1);
+
+static int
+compare(const void *p1, const void *p2)
+{
+	return ((const struct _gntarr *)p1)->pa  - ((const struct _gntarr *)p2)->pa;
+}
+
+
+static struct _mempool_gntalloc_info
+_create_mempool(const char *name, unsigned elt_num, unsigned elt_size,
+		   unsigned cache_size, unsigned private_data_size,
+		   rte_mempool_ctor_t *mp_init, void *mp_init_arg,
+		   rte_mempool_obj_ctor_t *obj_init, void *obj_init_arg,
+		   int socket_id, unsigned flags)
+{
+	struct _mempool_gntalloc_info mgi;
+	struct rte_mempool *mp = NULL;
+	struct rte_mempool_objsz  objsz;
+	uint32_t pg_num, rpg_num, pg_shift, pg_sz;
+	char *va, *orig_va, *uv; /* uv: from which, the pages could be freed */
+	ssize_t sz, usz; /* usz: unused size */
+	/*
+	 * for each page allocated through xen_gntalloc driver,
+	 * gref_arr:stores grant references,
+	 * pa_arr: stores physical address,
+	 * gnt_arr: stores all meta dat
+	 */
+	uint32_t *gref_arr = NULL;
+	phys_addr_t *pa_arr = NULL;
+	struct _gntarr *gnt_arr = NULL;
+	/* start index of the grant referances, used for dealloc*/
+	uint64_t start_index;
+	uint32_t i, j;
+	int rv = 0;
+	struct ioctl_gntalloc_dealloc_gref arg;
+
+	mgi.mp = NULL;
+	va = orig_va = uv = NULL;
+	pg_num = rpg_num = 0;
+	sz = 0;
+
+	pg_sz = getpagesize();
+	if (rte_is_power_of_2(pg_sz) == 0) {
+		goto out;
+	}
+	pg_shift = rte_bsf32(pg_sz);
+
+	rte_mempool_calc_obj_size(elt_size, flags, &objsz);
+	sz = rte_mempool_xmem_size(elt_num, objsz.total_size, pg_shift);
+	pg_num = sz >> pg_shift;
+
+	pa_arr = calloc(pg_num, sizeof(pa_arr[0]));
+	gref_arr = calloc(pg_num, sizeof(gref_arr[0]));
+	gnt_arr  = calloc(pg_num, sizeof(gnt_arr[0]));
+	if ((gnt_arr == NULL) || (gref_arr == NULL) || (pa_arr == NULL))
+		goto out;
+
+	/* grant index is continuous in ascending order */
+	orig_va = gntalloc(sz, gref_arr, &start_index);
+	if (orig_va == NULL)
+		goto out;
+
+	get_phys_map(orig_va, pa_arr, pg_num, pg_sz);
+	for (i = 0; i < pg_num; i++) {
+		gnt_arr[i].index = start_index + i * pg_sz;
+		gnt_arr[i].gref = gref_arr[i];
+		gnt_arr[i].pa = pa_arr[i];
+		gnt_arr[i].va  = RTE_PTR_ADD(orig_va, i * pg_sz);
+	}
+	qsort(gnt_arr, pg_num, sizeof(struct _gntarr), compare);
+
+	va = get_xen_virtual(sz, pg_sz);
+	if (va == NULL) {
+		goto out;
+	}
+
+	/*
+	 * map one by one, as index isn't continuous now.
+	 * pg_num VMAs, doesn't linux has a limitation on this?
+	 */
+	for (i = 0; i < pg_num; i++) {
+	/* update gref_arr and pa_arr after sort */
+		gref_arr[i] = gnt_arr[i].gref;
+		pa_arr[i]   = gnt_arr[i].pa;
+		gnt_arr[i].va = mmap(va + i * pg_sz, pg_sz, PROT_READ | PROT_WRITE,
+			MAP_SHARED | MAP_FIXED, gntalloc_fd, gnt_arr[i].index);
+		if ((gnt_arr[i].va == MAP_FAILED) || (gnt_arr[i].va != (va + i * pg_sz))) {
+			RTE_LOG(ERR, PMD, "failed to map %d pages\n", i);
+			goto mmap_failed;
+		}
+	}
+
+	/*
+	 * Check that allocated size is big enough to hold elt_num
+	 * objects and a calcualte how many bytes are actually required.
+	 */
+	usz = rte_mempool_xmem_usage(va, elt_num, objsz.total_size, pa_arr, pg_num, pg_shift);
+	if (usz < 0) {
+		mp = NULL;
+		i = pg_num;
+		goto mmap_failed;
+	} else {
+		/* unmap unused pages if any */
+		uv = RTE_PTR_ADD(va, usz);
+		if ((usz = va + sz - uv) > 0) {
+
+			RTE_LOG(ERR, PMD,
+				"%s(%s): unmap unused %zu of %zu "
+				"mmaped bytes @%p orig:%p\n",
+				__func__, name, usz, sz, uv, va);
+			munmap(uv, usz);
+			i = (sz - usz) / pg_sz;
+			for (; i < pg_num; i++) {
+				arg.count = 1;
+				arg.index = gnt_arr[i].index;
+				rv = ioctl(gntalloc_fd, IOCTL_GNTALLOC_DEALLOC_GREF, &arg);
+				if (rv) {
+					/* shouldn't fail here */
+					RTE_LOG(ERR, PMD, "va=%p pa=%"PRIu64"x index=%"PRIu64" %s\n",
+						gnt_arr[i].va,
+						gnt_arr[i].pa,
+						arg.index, strerror(errno));
+					rte_panic("gntdealloc failed when freeing pages\n");
+				}
+			}
+
+			rpg_num = (sz - usz) >> pg_shift;
+		} else
+			rpg_num = pg_num;
+
+		mp = rte_mempool_xmem_create(name, elt_num, elt_size,
+				cache_size, private_data_size,
+				mp_init, mp_init_arg,
+				obj_init, obj_init_arg,
+				socket_id, flags, va, pa_arr, rpg_num, pg_shift);
+
+		RTE_VERIFY(elt_num == mp->size);
+	}
+	mgi.mp = mp;
+	mgi.pg_num = rpg_num;
+	mgi.gref_arr = gref_arr;
+	mgi.pa_arr = pa_arr;
+	if (mp)
+		mgi.mempool_idx = rte_atomic32_add_return(&global_xenvirt_mempool_idx, 1);
+	mgi.start_index = start_index;
+	mgi.va = va;
+
+	if (mp == NULL) {
+		i = pg_num;
+		goto mmap_failed;
+	}
+
+/*
+ * unmap only, without deallocate grant reference.
+ * unused pages have already been unmaped,
+ * unmap twice will fail, but it is safe.
+ */
+mmap_failed:
+	for (j = 0; j < i; j++) {
+		if (gnt_arr[i].va)
+			munmap(gnt_arr[i].va, pg_sz);
+	}
+out:
+	free(gnt_arr);
+	if (orig_va)
+		munmap(orig_va, sz);
+	if (mp == NULL) {
+		free(gref_arr);
+		free(pa_arr);
+
+		/* some gref has already been de-allocated from the list in the driver,
+		 * so dealloc one by one, and it is safe to deallocate twice
+		 */
+		if (orig_va) {
+			for (i = 0; i < pg_num; i++) {
+				arg.index = start_index + i * pg_sz;
+				rv = ioctl(gntalloc_fd, IOCTL_GNTALLOC_DEALLOC_GREF, arg);
+			}
+		}
+	}
+	return mgi;
+}
+
+struct rte_mempool *
+rte_mempool_gntalloc_create(const char *name, unsigned elt_num, unsigned elt_size,
+		   unsigned cache_size, unsigned private_data_size,
+		   rte_mempool_ctor_t *mp_init, void *mp_init_arg,
+		   rte_mempool_obj_ctor_t *obj_init, void *obj_init_arg,
+		   int socket_id, unsigned flags)
+{
+	int rv;
+	uint32_t i;
+	struct _mempool_gntalloc_info mgi;
+	struct ioctl_gntalloc_dealloc_gref arg;
+	int pg_sz = getpagesize();
+
+	mgi = _create_mempool(name, elt_num, elt_size,
+			cache_size, private_data_size,
+			mp_init, mp_init_arg,
+			obj_init, obj_init_arg,
+			socket_id, flags);
+	if (mgi.mp) {
+		rv = grant_gntalloc_mbuf_pool(mgi.mp,
+			mgi.pg_num,
+			mgi.gref_arr,
+			mgi.pa_arr,
+			mgi.mempool_idx);
+		free(mgi.gref_arr);
+		free(mgi.pa_arr);
+		if (rv == 0)
+			return mgi.mp;
+		/*
+		 * in _create_mempool, unused pages have already been unmapped, deallocagted
+		 * unmap and dealloc the remained ones here.
+		 */
+		munmap(mgi.va, pg_sz * mgi.pg_num);
+		for (i = 0; i < mgi.pg_num; i++) {
+			arg.index = mgi.start_index + i * pg_sz;
+			rv = ioctl(gntalloc_fd, IOCTL_GNTALLOC_DEALLOC_GREF, arg);
+		}
+		return NULL;
+	}
+	return NULL;
+
+
+
+}