Imported Upstream version 17.05

[deb_dpdk.git] / lib / librte_distributor / rte_distributor_match_sse.c

diff --git a/lib/librte_distributor/rte_distributor_match_sse.c b/lib/librte_distributor/rte_distributor_match_sse.c
new file mode 100644 (file)
index 0000000..44935a6
--- /dev/null
+++ b/lib/librte_distributor/rte_distributor_match_sse.c
@@ -0,0 +1,114 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2017 Intel Corporation. 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 <rte_mbuf.h>
+#include "rte_distributor_private.h"
+#include "rte_distributor.h"
+#include "smmintrin.h"
+#include "nmmintrin.h"
+
+
+void
+find_match_vec(struct rte_distributor *d,
+                       uint16_t *data_ptr,
+                       uint16_t *output_ptr)
+{
+       /* Setup */
+       __m128i incoming_fids;
+       __m128i inflight_fids;
+       __m128i preflight_fids;
+       __m128i wkr;
+       __m128i mask1;
+       __m128i mask2;
+       __m128i output;
+       struct rte_distributor_backlog *bl;
+       uint16_t i;
+
+       /*
+        * Function overview:
+        * 2. Loop through all worker ID's
+        *  2a. Load the current inflights for that worker into an xmm reg
+        *  2b. Load the current backlog for that worker into an xmm reg
+        *  2c. use cmpestrm to intersect flow_ids with backlog and inflights
+        *  2d. Add any matches to the output
+        * 3. Write the output xmm (matching worker ids).
+        */
+
+
+       output = _mm_set1_epi16(0);
+       incoming_fids = _mm_load_si128((__m128i *)data_ptr);
+
+       for (i = 0; i < d->num_workers; i++) {
+               bl = &d->backlog[i];
+
+               inflight_fids =
+                       _mm_load_si128((__m128i *)&(d->in_flight_tags[i]));
+               preflight_fids =
+                       _mm_load_si128((__m128i *)(bl->tags));
+
+               /*
+                * Any incoming_fid that exists anywhere in inflight_fids will
+                * have 0xffff in same position of the mask as the incoming fid
+                * Example (shortened to bytes for brevity):
+                * incoming_fids   0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08
+                * inflight_fids   0x03 0x05 0x07 0x00 0x00 0x00 0x00 0x00
+                * mask            0x00 0x00 0xff 0x00 0xff 0x00 0xff 0x00
+                */
+
+               mask1 = _mm_cmpestrm(inflight_fids, 8, incoming_fids, 8,
+                       _SIDD_UWORD_OPS |
+                       _SIDD_CMP_EQUAL_ANY |
+                       _SIDD_UNIT_MASK);
+               mask2 = _mm_cmpestrm(preflight_fids, 8, incoming_fids, 8,
+                       _SIDD_UWORD_OPS |
+                       _SIDD_CMP_EQUAL_ANY |
+                       _SIDD_UNIT_MASK);
+
+               mask1 = _mm_or_si128(mask1, mask2);
+               /*
+                * Now mask contains 0xffff where there's a match.
+                * Next we need to store the worker_id in the relevant position
+                * in the output.
+                */
+
+               wkr = _mm_set1_epi16(i+1);
+               mask1 = _mm_and_si128(mask1, wkr);
+               output = _mm_or_si128(mask1, output);
+       }
+
+       /*
+        * At this stage, the output 128-bit contains 8 16-bit values, with
+        * each non-zero value containing the worker ID on which the
+        * corresponding flow is pinned to.
+        */
+       _mm_store_si128((__m128i *)output_ptr, output);
+}