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authorDamjan Marion <damarion@cisco.com>2018-03-09 16:05:56 +0100
committerFlorin Coras <florin.coras@gmail.com>2018-03-09 19:20:32 +0000
commit51c52c0adc9bf79ca6508ee1327d3b972e80b5c6 (patch)
tree70936cd041b0faf511592c46c5c69948e7a95f91 /src/plugins
parentfef3f7bd0ae43586540533e7ee1a7cc910ccb16d (diff)
dpdk: move DPDK vfio hack to dpdk plugin
Change-Id: I806cbf8c6c49643fe6c317bcceab93c1b9d441ab Signed-off-by: Damjan Marion <damarion@cisco.com>
Diffstat (limited to 'src/plugins')
-rw-r--r--src/plugins/dpdk/buffer.c69
1 files changed, 67 insertions, 2 deletions
diff --git a/src/plugins/dpdk/buffer.c b/src/plugins/dpdk/buffer.c
index f6379a1da4a..47d66484b3d 100644
--- a/src/plugins/dpdk/buffer.c
+++ b/src/plugins/dpdk/buffer.c
@@ -43,6 +43,10 @@
* Allocate/free network buffers.
*/
+#include <unistd.h>
+#include <linux/vfio.h>
+#include <sys/ioctl.h>
+
#include <rte_config.h>
#include <rte_common.h>
@@ -71,11 +75,13 @@
#include <rte_version.h>
#include <vlib/vlib.h>
+#include <vlib/unix/unix.h>
+#include <vlib/pci/pci.h>
+#include <vlib/linux/vfio.h>
#include <vnet/vnet.h>
#include <dpdk/device/dpdk.h>
#include <dpdk/device/dpdk_priv.h>
-
STATIC_ASSERT (VLIB_BUFFER_PRE_DATA_SIZE == RTE_PKTMBUF_HEADROOM,
"VLIB_BUFFER_PRE_DATA_SIZE must be equal to RTE_PKTMBUF_HEADROOM");
@@ -91,6 +97,7 @@ typedef struct
typedef struct
{
+ int vfio_container_fd;
dpdk_buffer_per_thread_data *ptd;
} dpdk_buffer_main_t;
@@ -459,11 +466,38 @@ dpdk_packet_template_init (vlib_main_t * vm,
vlib_worker_thread_barrier_release (vm);
}
+static clib_error_t *
+scan_vfio_fd (void *arg, u8 * path_name, u8 * file_name)
+{
+ dpdk_buffer_main_t *dbm = &dpdk_buffer_main;
+ linux_vfio_main_t *lvm = &vfio_main;
+ const char fn[] = "/dev/vfio/vfio";
+ char buff[sizeof (fn)] = { 0 };
+ int fd;
+ u8 *path = format (0, "%v%c", path_name, 0);
+
+ if (readlink ((char *) path, buff, sizeof (fn)) + 1 != sizeof (fn))
+ goto done;
+
+ if (strncmp (fn, buff, sizeof (fn)))
+ goto done;
+
+ fd = atoi ((char *) file_name);
+ if (fd != lvm->container_fd)
+ dbm->vfio_container_fd = fd;
+
+done:
+ vec_free (path);
+ return 0;
+}
+
clib_error_t *
dpdk_pool_create (vlib_main_t * vm, u8 * pool_name, u32 elt_size,
u32 num_elts, u32 pool_priv_size, u16 cache_size, u8 numa,
- struct rte_mempool **_mp, vlib_physmem_region_index_t * pri)
+ struct rte_mempool ** _mp,
+ vlib_physmem_region_index_t * pri)
{
+ dpdk_buffer_main_t *dbm = &dpdk_buffer_main;
struct rte_mempool *mp;
vlib_physmem_region_t *pr;
clib_error_t *error = 0;
@@ -501,6 +535,33 @@ dpdk_pool_create (vlib_main_t * vm, u8 * pool_name, u32 elt_size,
_mp[0] = mp;
+ /* DPDK currently doesn't provide API to map DMA memory for empty mempool
+ so we are using this hack, will be nice to have at least API to get
+ VFIO container FD */
+ if (dbm->vfio_container_fd == -1)
+ foreach_directory_file ("/proc/self/fd", scan_vfio_fd, 0, 0);
+
+ if (dbm->vfio_container_fd != -1)
+ {
+ struct vfio_iommu_type1_dma_map dm = { 0 };
+ int i, rv = 0;
+ dm.argsz = sizeof (struct vfio_iommu_type1_dma_map);
+ dm.flags = VFIO_DMA_MAP_FLAG_READ | VFIO_DMA_MAP_FLAG_WRITE;
+
+ /* *INDENT-OFF* */
+ vec_foreach_index (i, pr->page_table)
+ {
+ dm.vaddr = pointer_to_uword (pr->mem) + (i << pr->log2_page_size);
+ dm.size = 1 << pr->log2_page_size;
+ dm.iova = pr->page_table[i];
+ if ((rv = ioctl (dbm->vfio_container_fd, VFIO_IOMMU_MAP_DMA, &dm)))
+ break;
+ }
+ /* *INDENT-ON* */
+ if (rv != 0 && rv != EINVAL)
+ clib_unix_warning ("ioctl(VFIO_IOMMU_MAP_DMA) pool '%s'", pool_name);
+ }
+
return 0;
}
@@ -665,8 +726,12 @@ dpdk_buffer_init (vlib_main_t * vm)
{
dpdk_buffer_main_t *dbm = &dpdk_buffer_main;
vlib_thread_main_t *tm = vlib_get_thread_main ();
+
vec_validate_aligned (dbm->ptd, tm->n_vlib_mains - 1,
CLIB_CACHE_LINE_BYTES);
+
+ dbm->vfio_container_fd = -1;
+
return 0;
}