--- /dev/null
+/*
+ * Copyright (c) 2015 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.
+ */
+#include "ssvm_eth.h"
+
+vlib_node_registration_t ssvm_eth_input_node;
+
+typedef struct
+{
+ u32 next_index;
+ u32 sw_if_index;
+} ssvm_eth_input_trace_t;
+
+/* packet trace format function */
+static u8 *
+format_ssvm_eth_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 *);
+ ssvm_eth_input_trace_t *t = va_arg (*args, ssvm_eth_input_trace_t *);
+
+ s = format (s, "SSVM_ETH_INPUT: sw_if_index %d, next index %d",
+ t->sw_if_index, t->next_index);
+ return s;
+}
+
+vlib_node_registration_t ssvm_eth_input_node;
+
+#define foreach_ssvm_eth_input_error \
+_(NO_BUFFERS, "Rx packet drops (no buffers)")
+
+typedef enum
+{
+#define _(sym,str) SSVM_ETH_INPUT_ERROR_##sym,
+ foreach_ssvm_eth_input_error
+#undef _
+ SSVM_ETH_INPUT_N_ERROR,
+} ssvm_eth_input_error_t;
+
+static char *ssvm_eth_input_error_strings[] = {
+#define _(sym,string) string,
+ foreach_ssvm_eth_input_error
+#undef _
+};
+
+typedef enum
+{
+ SSVM_ETH_INPUT_NEXT_DROP,
+ SSVM_ETH_INPUT_NEXT_ETHERNET_INPUT,
+ SSVM_ETH_INPUT_NEXT_IP4_INPUT,
+ SSVM_ETH_INPUT_NEXT_IP6_INPUT,
+ SSVM_ETH_INPUT_NEXT_MPLS_INPUT,
+ SSVM_ETH_INPUT_N_NEXT,
+} ssvm_eth_input_next_t;
+
+static inline uword
+ssvm_eth_device_input (ssvm_eth_main_t * em,
+ ssvm_private_t * intfc, vlib_node_runtime_t * node)
+{
+ ssvm_shared_header_t *sh = intfc->sh;
+ vlib_main_t *vm = em->vlib_main;
+ unix_shared_memory_queue_t *q;
+ ssvm_eth_queue_elt_t *elt, *elts;
+ u32 elt_index;
+ u32 my_pid = intfc->my_pid;
+ int rx_queue_index;
+ u32 n_to_alloc = VLIB_FRAME_SIZE * 2;
+ u32 n_allocated, n_present_in_cache;
+ u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
+ vlib_buffer_free_list_t *fl;
+ u32 n_left_to_next, *to_next;
+ u32 next0;
+ u32 n_buffers;
+ u32 n_available;
+ u32 bi0, saved_bi0;
+ vlib_buffer_t *b0, *prev;
+ u32 saved_cache_size = 0;
+ ethernet_header_t *eh0;
+ u16 type0;
+ u32 n_rx_bytes = 0, l3_offset0;
+ u32 cpu_index = os_get_cpu_number ();
+ u32 trace_cnt __attribute__ ((unused)) = vlib_get_trace_count (vm, node);
+ volatile u32 *lock;
+ u32 *elt_indices;
+ uword n_trace = vlib_get_trace_count (vm, node);
+
+ /* Either side down? buh-bye... */
+ if (pointer_to_uword (sh->opaque[MASTER_ADMIN_STATE_INDEX]) == 0 ||
+ pointer_to_uword (sh->opaque[SLAVE_ADMIN_STATE_INDEX]) == 0)
+ return 0;
+
+ if (intfc->i_am_master)
+ q = (unix_shared_memory_queue_t *) (sh->opaque[TO_MASTER_Q_INDEX]);
+ else
+ q = (unix_shared_memory_queue_t *) (sh->opaque[TO_SLAVE_Q_INDEX]);
+
+ /* Nothing to do? */
+ if (q->cursize == 0)
+ return 0;
+
+ fl = vlib_buffer_get_free_list (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
+
+ vec_reset_length (intfc->rx_queue);
+
+ lock = (u32 *) q;
+ while (__sync_lock_test_and_set (lock, 1))
+ ;
+ while (q->cursize > 0)
+ {
+ unix_shared_memory_queue_sub_raw (q, (u8 *) & elt_index);
+ ASSERT (elt_index < 2048);
+ vec_add1 (intfc->rx_queue, elt_index);
+ }
+ CLIB_MEMORY_BARRIER ();
+ *lock = 0;
+
+ n_present_in_cache = vec_len (em->buffer_cache);
+
+ if (vec_len (em->buffer_cache) < vec_len (intfc->rx_queue) * 2)
+ {
+ vec_validate (em->buffer_cache,
+ n_to_alloc + vec_len (em->buffer_cache) - 1);
+ n_allocated =
+ vlib_buffer_alloc (vm, &em->buffer_cache[n_present_in_cache],
+ n_to_alloc);
+
+ n_present_in_cache += n_allocated;
+ _vec_len (em->buffer_cache) = n_present_in_cache;
+ }
+
+ elts = (ssvm_eth_queue_elt_t *) (sh->opaque[CHUNK_POOL_INDEX]);
+
+ n_buffers = vec_len (intfc->rx_queue);
+ rx_queue_index = 0;
+
+ while (n_buffers > 0)
+ {
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+ while (n_buffers > 0 && n_left_to_next > 0)
+ {
+ elt = elts + intfc->rx_queue[rx_queue_index];
+
+ saved_cache_size = n_present_in_cache;
+ if (PREDICT_FALSE (saved_cache_size == 0))
+ {
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ goto out;
+ }
+ saved_bi0 = bi0 = em->buffer_cache[--n_present_in_cache];
+ b0 = vlib_get_buffer (vm, bi0);
+ prev = 0;
+
+ while (1)
+ {
+ vlib_buffer_init_for_free_list (b0, fl);
+
+ b0->current_data = elt->current_data_hint;
+ b0->current_length = elt->length_this_buffer;
+ b0->total_length_not_including_first_buffer =
+ elt->total_length_not_including_first_buffer;
+
+ clib_memcpy (b0->data + b0->current_data, elt->data,
+ b0->current_length);
+
+ if (PREDICT_FALSE (prev != 0))
+ prev->next_buffer = bi0;
+
+ if (PREDICT_FALSE (elt->flags & SSVM_BUFFER_NEXT_PRESENT))
+ {
+ prev = b0;
+ if (PREDICT_FALSE (n_present_in_cache == 0))
+ {
+ vlib_put_next_frame (vm, node, next_index,
+ n_left_to_next);
+ goto out;
+ }
+ bi0 = em->buffer_cache[--n_present_in_cache];
+ b0 = vlib_get_buffer (vm, bi0);
+ }
+ else
+ break;
+ }
+
+ saved_cache_size = n_present_in_cache;
+
+ to_next[0] = saved_bi0;
+ to_next++;
+ n_left_to_next--;
+
+ b0 = vlib_get_buffer (vm, saved_bi0);
+ eh0 = vlib_buffer_get_current (b0);
+
+ type0 = clib_net_to_host_u16 (eh0->type);
+
+ next0 = SSVM_ETH_INPUT_NEXT_ETHERNET_INPUT;
+
+ if (type0 == ETHERNET_TYPE_IP4)
+ next0 = SSVM_ETH_INPUT_NEXT_IP4_INPUT;
+ else if (type0 == ETHERNET_TYPE_IP6)
+ next0 = SSVM_ETH_INPUT_NEXT_IP6_INPUT;
+ else if (type0 == ETHERNET_TYPE_MPLS_UNICAST)
+ next0 = SSVM_ETH_INPUT_NEXT_MPLS_INPUT;
+
+ l3_offset0 = ((next0 == SSVM_ETH_INPUT_NEXT_IP4_INPUT ||
+ next0 == SSVM_ETH_INPUT_NEXT_IP6_INPUT ||
+ next0 == SSVM_ETH_INPUT_NEXT_MPLS_INPUT) ?
+ sizeof (ethernet_header_t) : 0);
+
+ n_rx_bytes += b0->current_length
+ + b0->total_length_not_including_first_buffer;
+
+ b0->current_data += l3_offset0;
+ b0->current_length -= l3_offset0;
+ b0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
+
+ vnet_buffer (b0)->sw_if_index[VLIB_RX] = intfc->vlib_hw_if_index;
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+
+ /*
+ * Turn this on if you run into
+ * "bad monkey" contexts, and you want to know exactly
+ * which nodes they've visited... See main.c...
+ */
+ VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
+
+ if (PREDICT_FALSE (n_trace > 0))
+ {
+ ssvm_eth_input_trace_t *tr;
+
+ vlib_trace_buffer (vm, node, next0, b0, /* follow_chain */ 1);
+ vlib_set_trace_count (vm, node, --n_trace);
+
+ tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
+
+ tr->next_index = next0;
+ tr->sw_if_index = intfc->vlib_hw_if_index;
+ }
+
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, next0);
+ n_buffers--;
+ rx_queue_index++;
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+out:
+ if (em->buffer_cache)
+ _vec_len (em->buffer_cache) = saved_cache_size;
+ else
+ ASSERT (saved_cache_size == 0);
+
+ ssvm_lock (sh, my_pid, 2);
+
+ ASSERT (vec_len (intfc->rx_queue) > 0);
+
+ n_available = (u32) pointer_to_uword (sh->opaque[CHUNK_POOL_NFREE]);
+ elt_indices = (u32 *) (sh->opaque[CHUNK_POOL_FREELIST_INDEX]);
+
+ clib_memcpy (&elt_indices[n_available], intfc->rx_queue,
+ vec_len (intfc->rx_queue) * sizeof (u32));
+
+ n_available += vec_len (intfc->rx_queue);
+ sh->opaque[CHUNK_POOL_NFREE] = uword_to_pointer (n_available, void *);
+
+ ssvm_unlock (sh);
+
+ vlib_error_count (vm, node->node_index, SSVM_ETH_INPUT_ERROR_NO_BUFFERS,
+ n_buffers);
+
+ vlib_increment_combined_counter
+ (vnet_get_main ()->interface_main.combined_sw_if_counters
+ + VNET_INTERFACE_COUNTER_RX, cpu_index,
+ intfc->vlib_hw_if_index, rx_queue_index, n_rx_bytes);
+
+ return rx_queue_index;
+}
+
+static uword
+ssvm_eth_input_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ ssvm_eth_main_t *em = &ssvm_eth_main;
+ ssvm_private_t *intfc;
+ uword n_rx_packets = 0;
+
+ vec_foreach (intfc, em->intfcs)
+ {
+ n_rx_packets += ssvm_eth_device_input (em, intfc, node);
+ }
+
+ return n_rx_packets;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ssvm_eth_input_node) = {
+ .function = ssvm_eth_input_node_fn,
+ .name = "ssvm_eth_input",
+ .vector_size = sizeof (u32),
+ .format_trace = format_ssvm_eth_input_trace,
+ .type = VLIB_NODE_TYPE_INPUT,
+ .state = VLIB_NODE_STATE_DISABLED,
+
+ .n_errors = ARRAY_LEN(ssvm_eth_input_error_strings),
+ .error_strings = ssvm_eth_input_error_strings,
+
+ .n_next_nodes = SSVM_ETH_INPUT_N_NEXT,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [SSVM_ETH_INPUT_NEXT_DROP] = "error-drop",
+ [SSVM_ETH_INPUT_NEXT_ETHERNET_INPUT] = "ethernet-input",
+ [SSVM_ETH_INPUT_NEXT_IP4_INPUT] = "ip4-input",
+ [SSVM_ETH_INPUT_NEXT_IP6_INPUT] = "ip6-input",
+ [SSVM_ETH_INPUT_NEXT_MPLS_INPUT] = "mpls-input",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (ssvm_eth_input_node, ssvm_eth_input_node_fn)
+/* *INDENT-ON* */
+
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
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