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authorDamjan Marion <damarion@cisco.com>2017-03-22 10:18:13 +0100
committerOle Trøan <otroan@employees.org>2017-03-22 19:52:47 +0000
commiteaabe073515e7722ed546b36f99efc6feea305a1 (patch)
tree7c5cfe203815d8cc8d989de646e5dedcd6bc2f9d /src/plugins/memif/node.c
parent24d01367c869f968b9e21c0cae4df8c5941fdf16 (diff)
Add memif - packet memory interface for intra-host communication
Change-Id: I94c06b07a39f07ceba87bf3e7fcfc70e43231e8a Signed-off-by: Damjan Marion <damarion@cisco.com> Co-Authored-By: Milan Lenco <Milan.Lenco@pantheon.tech>
Diffstat (limited to 'src/plugins/memif/node.c')
-rw-r--r--src/plugins/memif/node.c383
1 files changed, 383 insertions, 0 deletions
diff --git a/src/plugins/memif/node.c b/src/plugins/memif/node.c
new file mode 100644
index 00000000000..298472b04b7
--- /dev/null
+++ b/src/plugins/memif/node.c
@@ -0,0 +1,383 @@
+/*
+ *------------------------------------------------------------------
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *------------------------------------------------------------------
+ */
+
+#define _GNU_SOURCE
+#include <stdint.h>
+#include <net/if.h>
+#include <sys/ioctl.h>
+#include <sys/uio.h>
+
+#include <vlib/vlib.h>
+#include <vlib/unix/unix.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/devices/devices.h>
+#include <vnet/feature/feature.h>
+
+#include <memif/memif.h>
+
+#define foreach_memif_input_error
+
+typedef enum
+{
+#define _(f,s) MEMIF_INPUT_ERROR_##f,
+ foreach_memif_input_error
+#undef _
+ MEMIF_INPUT_N_ERROR,
+} memif_input_error_t;
+
+static char *memif_input_error_strings[] = {
+#define _(n,s) s,
+ foreach_memif_input_error
+#undef _
+};
+
+typedef struct
+{
+ u32 next_index;
+ u32 hw_if_index;
+ u16 ring;
+} memif_input_trace_t;
+
+static u8 *
+format_memif_input_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ memif_input_trace_t *t = va_arg (*args, memif_input_trace_t *);
+ uword indent = format_get_indent (s);
+
+ s = format (s, "memif: hw_if_index %d next-index %d",
+ t->hw_if_index, t->next_index);
+ s = format (s, "\n%Uslot: ring %u", format_white_space, indent + 2,
+ t->ring);
+ return s;
+}
+
+static_always_inline void
+memif_prefetch (vlib_main_t * vm, u32 bi)
+{
+ vlib_buffer_t *b = vlib_get_buffer (vm, bi);
+ vlib_prefetch_buffer_header (b, STORE);
+ CLIB_PREFETCH (b->data, CLIB_CACHE_LINE_BYTES, STORE);
+}
+
+static_always_inline uword
+memif_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * frame, memif_if_t * mif,
+ memif_ring_type_t type)
+{
+ vnet_main_t *vnm = vnet_get_main ();
+ u8 rid = 0; /* Ring id */
+ memif_ring_t *ring = memif_get_ring (mif, type, rid);
+ memif_ring_data_t *rd =
+ vec_elt_at_index (mif->ring_data, rid + type * mif->num_s2m_rings);
+ u16 head;
+
+ u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
+ uword n_trace = vlib_get_trace_count (vm, node);
+ memif_main_t *nm = &memif_main;
+ u32 n_rx_packets = 0;
+ u32 n_rx_bytes = 0;
+ u32 *to_next = 0;
+ u32 n_free_bufs;
+ u32 cpu_index = os_get_cpu_number ();
+ u32 bi0, bi1;
+ vlib_buffer_t *b0, *b1;
+ u16 ring_size = 1 << mif->log2_ring_size;
+ u16 mask = ring_size - 1;
+ u16 num_slots;
+ void *mb0, *mb1;
+
+ if (mif->per_interface_next_index != ~0)
+ next_index = mif->per_interface_next_index;
+
+ n_free_bufs = vec_len (nm->rx_buffers[cpu_index]);
+ if (PREDICT_FALSE (n_free_bufs < ring_size))
+ {
+ vec_validate (nm->rx_buffers[cpu_index], ring_size + n_free_bufs - 1);
+ n_free_bufs +=
+ vlib_buffer_alloc (vm, &nm->rx_buffers[cpu_index][n_free_bufs],
+ ring_size);
+ _vec_len (nm->rx_buffers[cpu_index]) = n_free_bufs;
+ }
+
+ head = ring->head;
+ if (head == rd->last_head)
+ return 0;
+
+ if (head > rd->last_head)
+ num_slots = head - rd->last_head;
+ else
+ num_slots = ring_size - rd->last_head + head;
+
+ while (num_slots)
+ {
+ u32 n_left_to_next;
+ u32 next0 = next_index;
+ u32 next1 = next_index;
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+ while (num_slots > 5 && n_left_to_next > 2)
+ {
+ if (PREDICT_TRUE (rd->last_head + 5 < ring_size))
+ {
+ CLIB_PREFETCH (memif_get_buffer (mif, ring, rd->last_head + 2),
+ CLIB_CACHE_LINE_BYTES, LOAD);
+ CLIB_PREFETCH (memif_get_buffer (mif, ring, rd->last_head + 3),
+ CLIB_CACHE_LINE_BYTES, LOAD);
+ CLIB_PREFETCH (&ring->desc[rd->last_head + 4],
+ CLIB_CACHE_LINE_BYTES, LOAD);
+ CLIB_PREFETCH (&ring->desc[rd->last_head + 5],
+ CLIB_CACHE_LINE_BYTES, LOAD);
+ }
+ else
+ {
+ CLIB_PREFETCH (memif_get_buffer
+ (mif, ring, (rd->last_head + 2) % mask),
+ CLIB_CACHE_LINE_BYTES, LOAD);
+ CLIB_PREFETCH (memif_get_buffer
+ (mif, ring, (rd->last_head + 3) % mask),
+ CLIB_CACHE_LINE_BYTES, LOAD);
+ CLIB_PREFETCH (&ring->desc[(rd->last_head + 4) % mask],
+ CLIB_CACHE_LINE_BYTES, LOAD);
+ CLIB_PREFETCH (&ring->desc[(rd->last_head + 5) % mask],
+ CLIB_CACHE_LINE_BYTES, LOAD);
+ }
+ /* get empty buffer */
+ u32 last_buf = vec_len (nm->rx_buffers[cpu_index]) - 1;
+ bi0 = nm->rx_buffers[cpu_index][last_buf];
+ bi1 = nm->rx_buffers[cpu_index][last_buf - 1];
+ _vec_len (nm->rx_buffers[cpu_index]) -= 2;
+
+ if (last_buf > 4)
+ {
+ memif_prefetch (vm, nm->rx_buffers[cpu_index][last_buf - 2]);
+ memif_prefetch (vm, nm->rx_buffers[cpu_index][last_buf - 3]);
+ }
+
+ /* enqueue buffer */
+ to_next[0] = bi0;
+ to_next[1] = bi1;
+ to_next += 2;
+ n_left_to_next -= 2;
+
+ /* fill buffer metadata */
+ b0 = vlib_get_buffer (vm, bi0);
+ b1 = vlib_get_buffer (vm, bi1);
+
+ vnet_buffer (b0)->sw_if_index[VLIB_RX] = mif->sw_if_index;
+ vnet_buffer (b1)->sw_if_index[VLIB_RX] = mif->sw_if_index;
+
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+ vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+
+ /* copy buffer */
+ mb0 = memif_get_buffer (mif, ring, rd->last_head);
+ clib_memcpy (vlib_buffer_get_current (b0), mb0,
+ CLIB_CACHE_LINE_BYTES);
+ b0->current_length = ring->desc[rd->last_head].length;
+ rd->last_head = (rd->last_head + 1) & mask;
+
+ mb1 = memif_get_buffer (mif, ring, rd->last_head);
+ clib_memcpy (vlib_buffer_get_current (b1), mb1,
+ CLIB_CACHE_LINE_BYTES);
+ b1->current_length = ring->desc[rd->last_head].length;
+ rd->last_head = (rd->last_head + 1) & mask;
+
+ if (b0->current_length > CLIB_CACHE_LINE_BYTES)
+ clib_memcpy (vlib_buffer_get_current (b0) + CLIB_CACHE_LINE_BYTES,
+ mb0 + CLIB_CACHE_LINE_BYTES,
+ b0->current_length - CLIB_CACHE_LINE_BYTES);
+
+ if (b1->current_length > CLIB_CACHE_LINE_BYTES)
+ clib_memcpy (vlib_buffer_get_current (b1) + CLIB_CACHE_LINE_BYTES,
+ mb1 + CLIB_CACHE_LINE_BYTES,
+ b1->current_length - CLIB_CACHE_LINE_BYTES);
+
+ /* trace */
+ VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
+ VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b1);
+
+ if (PREDICT_FALSE (n_trace > 0))
+ {
+ if (b0)
+ {
+ memif_input_trace_t *tr;
+ vlib_trace_buffer (vm, node, next0, b0,
+ /* follow_chain */ 0);
+ vlib_set_trace_count (vm, node, --n_trace);
+ tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
+ tr->next_index = next0;
+ tr->hw_if_index = mif->hw_if_index;
+ tr->ring = rid;
+ }
+
+ if (n_trace && b1)
+ {
+ memif_input_trace_t *tr;
+ vlib_trace_buffer (vm, node, next1, b1,
+ /* follow_chain */ 0);
+ vlib_set_trace_count (vm, node, --n_trace);
+ tr = vlib_add_trace (vm, node, b1, sizeof (*tr));
+ tr->next_index = next1;
+ tr->hw_if_index = mif->hw_if_index;
+ tr->ring = rid;
+ }
+ }
+
+ /* redirect if feature path enabled */
+ vnet_feature_start_device_input_x2 (mif->sw_if_index,
+ &next0, &next1, b0, b1);
+
+ /* enqueue */
+ vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
+ n_left_to_next,
+ bi0, bi1, next0, next1);
+
+ /* next packet */
+ num_slots -= 2;
+ n_rx_packets += 2;
+ n_rx_bytes += b0->current_length;
+ n_rx_bytes += b1->current_length;
+ }
+ while (num_slots && n_left_to_next)
+ {
+ /* get empty buffer */
+ u32 last_buf = vec_len (nm->rx_buffers[cpu_index]) - 1;
+ bi0 = nm->rx_buffers[cpu_index][last_buf];
+ _vec_len (nm->rx_buffers[cpu_index]) = last_buf;
+
+ /* enqueue buffer */
+ to_next[0] = bi0;
+ to_next += 1;
+ n_left_to_next--;
+
+ /* fill buffer metadata */
+ b0 = vlib_get_buffer (vm, bi0);
+ b0->current_length = ring->desc[rd->last_head].length;
+ vnet_buffer (b0)->sw_if_index[VLIB_RX] = mif->sw_if_index;
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+
+ /* copy buffer */
+ mb0 = memif_get_buffer (mif, ring, rd->last_head);
+ clib_memcpy (vlib_buffer_get_current (b0), mb0,
+ CLIB_CACHE_LINE_BYTES);
+ if (b0->current_length > CLIB_CACHE_LINE_BYTES)
+ clib_memcpy (vlib_buffer_get_current (b0) + CLIB_CACHE_LINE_BYTES,
+ mb0 + CLIB_CACHE_LINE_BYTES,
+ b0->current_length - CLIB_CACHE_LINE_BYTES);
+
+ /* trace */
+ VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
+
+ if (PREDICT_FALSE (n_trace > 0))
+ {
+ if (b0)
+ {
+ memif_input_trace_t *tr;
+ vlib_trace_buffer (vm, node, next0, b0,
+ /* follow_chain */ 0);
+ vlib_set_trace_count (vm, node, --n_trace);
+ tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
+ tr->next_index = next0;
+ tr->hw_if_index = mif->hw_if_index;
+ tr->ring = rid;
+ }
+ }
+
+
+ /* redirect if feature path enabled */
+ vnet_feature_start_device_input_x1 (mif->sw_if_index, &next0, b0);
+
+ /* enqueue */
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
+ n_left_to_next, bi0, next0);
+
+ /* next packet */
+ rd->last_head = (rd->last_head + 1) & mask;
+ num_slots--;
+ n_rx_packets++;
+ n_rx_bytes += b0->current_length;
+ }
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+ CLIB_MEMORY_STORE_BARRIER ();
+ ring->tail = head;
+
+ vlib_increment_combined_counter (vnm->interface_main.combined_sw_if_counters
+ + VNET_INTERFACE_COUNTER_RX, cpu_index,
+ mif->hw_if_index, n_rx_packets,
+ n_rx_bytes);
+
+ return n_rx_packets;
+}
+
+static uword
+memif_input_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ u32 n_rx_packets = 0;
+ u32 cpu_index = os_get_cpu_number ();
+ memif_main_t *nm = &memif_main;
+ memif_if_t *mif;
+
+ /* *INDENT-OFF* */
+ pool_foreach (mif, nm->interfaces,
+ ({
+ if (mif->flags & MEMIF_IF_FLAG_ADMIN_UP &&
+ mif->flags & MEMIF_IF_FLAG_CONNECTED &&
+ (mif->if_index % nm->input_cpu_count) ==
+ (cpu_index - nm->input_cpu_first_index))
+ {
+ if (mif->flags & MEMIF_IF_FLAG_IS_SLAVE)
+ n_rx_packets +=
+ memif_device_input_inline (vm, node, frame, mif,
+ MEMIF_RING_M2S);
+ else
+ n_rx_packets +=
+ memif_device_input_inline (vm, node, frame, mif,
+ MEMIF_RING_S2M);
+ }
+ }));
+ /* *INDENT-ON* */
+
+ return n_rx_packets;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (memif_input_node) = {
+ .function = memif_input_fn,
+ .name = "memif-input",
+ .sibling_of = "device-input",
+ .format_trace = format_memif_input_trace,
+ .type = VLIB_NODE_TYPE_INPUT,
+ .state = VLIB_NODE_STATE_INTERRUPT,
+ .n_errors = MEMIF_INPUT_N_ERROR,
+ .error_strings = memif_input_error_strings,
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (memif_input_node, memif_input_fn)
+/* *INDENT-ON* */
+
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */