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-rw-r--r--src/plugins/vmxnet3/output.c209
1 files changed, 209 insertions, 0 deletions
diff --git a/src/plugins/vmxnet3/output.c b/src/plugins/vmxnet3/output.c
new file mode 100644
index 00000000000..2ca1cc9f107
--- /dev/null
+++ b/src/plugins/vmxnet3/output.c
@@ -0,0 +1,209 @@
+/*
+ *------------------------------------------------------------------
+ * Copyright (c) 2018 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 <vlib/vlib.h>
+#include <vlib/unix/unix.h>
+#include <vlib/pci/pci.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/devices/devices.h>
+
+#include <vmxnet3/vmxnet3.h>
+
+static_always_inline void
+vmxnet3_tx_comp_ring_advance_next (vmxnet3_txq_t * txq)
+{
+ vmxnet3_tx_comp_ring *comp_ring = &txq->tx_comp_ring;
+
+ comp_ring->next++;
+ if (PREDICT_FALSE (comp_ring->next == txq->size))
+ {
+ comp_ring->next = 0;
+ comp_ring->gen ^= VMXNET3_TXCF_GEN;
+ }
+}
+
+static_always_inline void
+vmxnet3_tx_ring_advance_produce (vmxnet3_txq_t * txq)
+{
+ txq->tx_ring.produce++;
+ if (PREDICT_FALSE (txq->tx_ring.produce == txq->size))
+ {
+ txq->tx_ring.produce = 0;
+ txq->tx_ring.gen ^= VMXNET3_TXF_GEN;
+ }
+}
+
+static_always_inline void
+vmxnet3_tx_ring_advance_consume (vmxnet3_txq_t * txq)
+{
+ txq->tx_ring.consume++;
+ txq->tx_ring.consume &= txq->size - 1;
+}
+
+static_always_inline void
+vmxnet3_txq_release (vlib_main_t * vm, vmxnet3_device_t * vd,
+ vmxnet3_txq_t * txq)
+{
+ vmxnet3_tx_comp *tx_comp;
+ u32 bi0;
+ vmxnet3_tx_comp_ring *comp_ring;
+ u16 eop_idx, desc_idx;
+
+ comp_ring = &txq->tx_comp_ring;
+ tx_comp = &txq->tx_comp[comp_ring->next];
+
+ while ((tx_comp->flags & VMXNET3_TXCF_GEN) == comp_ring->gen)
+ {
+ eop_idx = tx_comp->index & VMXNET3_TXC_INDEX;
+ do
+ {
+ desc_idx = txq->tx_ring.consume;
+ bi0 = txq->tx_ring.bufs[desc_idx];
+ txq->tx_ring.bufs[desc_idx] = ~0;
+ vlib_buffer_free_no_next (vm, &bi0, 1);
+ vmxnet3_tx_ring_advance_consume (txq);
+ }
+ while (desc_idx != eop_idx);
+
+ vmxnet3_tx_comp_ring_advance_next (txq);
+ tx_comp = &txq->tx_comp[comp_ring->next];
+ }
+}
+
+static_always_inline u16
+vmxnet3_tx_ring_space_left (vmxnet3_txq_t * txq)
+{
+ u16 count;
+
+ count = (txq->tx_ring.consume - txq->tx_ring.produce - 1);
+ /* Wrapped? */
+ if (txq->tx_ring.produce >= txq->tx_ring.consume)
+ count += txq->size;
+ return count;
+}
+
+VNET_DEVICE_CLASS_TX_FN (vmxnet3_device_class) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ vmxnet3_main_t *vmxm = &vmxnet3_main;
+ vnet_interface_output_runtime_t *rd = (void *) node->runtime_data;
+ vmxnet3_device_t *vd = pool_elt_at_index (vmxm->devices, rd->dev_instance);
+ u32 *buffers = vlib_frame_args (frame);
+ u32 bi0;
+ vlib_buffer_t *b0;
+ vmxnet3_tx_desc *txd;
+ u32 desc_idx, generation, first_idx;
+ u16 space_left;
+ u16 n_left = frame->n_vectors;
+ vmxnet3_txq_t *txq;
+ u32 thread_index = vm->thread_index;
+ u16 qid = thread_index;
+ u16 n_retry = 5;
+
+ txq = vec_elt_at_index (vd->txqs, qid % vd->num_tx_queues);
+
+ clib_spinlock_lock_if_init (&txq->lock);
+
+retry:
+ vmxnet3_txq_release (vm, vd, txq);
+
+ while (n_left)
+ {
+ bi0 = buffers[0];
+ txd = 0;
+
+ /*
+ * Toggle the generation bit for SOP fragment to avoid device starts
+ * reading incomplete packet
+ */
+ generation = txq->tx_ring.gen ^ VMXNET3_TXF_GEN;
+ first_idx = txq->tx_ring.produce;
+ while (1)
+ {
+ b0 = vlib_get_buffer (vm, bi0);
+ VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
+
+ space_left = vmxnet3_tx_ring_space_left (txq);
+ if (PREDICT_FALSE (space_left == 0))
+ {
+ break;
+ }
+
+ desc_idx = txq->tx_ring.produce;
+
+ vmxnet3_tx_ring_advance_produce (txq);
+ txq->tx_ring.bufs[desc_idx] = bi0;
+
+ txd = &txq->tx_desc[desc_idx];
+ txd->address =
+ vlib_get_buffer_data_physical_address (vm,
+ bi0) + b0->current_data;
+
+ txd->flags[0] = generation | b0->current_length;
+
+ generation = txq->tx_ring.gen;
+ if (b0->flags & VLIB_BUFFER_NEXT_PRESENT)
+ {
+ txd->flags[1] = 0;
+ bi0 = b0->next_buffer;
+ }
+ else
+ break;
+ }
+
+ if (PREDICT_TRUE (txd != 0))
+ {
+ txd->flags[1] = VMXNET3_TXF_CQ | VMXNET3_TXF_EOP;
+ asm volatile ("":::"memory");
+ /*
+ * Now toggle back the generation bit for the first segment.
+ * Device can start reading the packet
+ */
+ txq->tx_desc[first_idx].flags[0] ^= VMXNET3_TXF_GEN;
+ vmxnet3_reg_write (vd, 0, VMXNET3_REG_TXPROD, txq->tx_ring.produce);
+ }
+
+ if (PREDICT_FALSE (space_left == 0))
+ {
+ break;
+ }
+
+ buffers++;
+ n_left--;
+ }
+
+ if (PREDICT_FALSE (n_left))
+ {
+ if (PREDICT_TRUE (n_retry--))
+ goto retry;
+ vlib_buffer_free (vm, buffers, n_left);
+ vlib_error_count (vm, node->node_index, VMXNET3_TX_ERROR_NO_FREE_SLOTS,
+ n_left);
+ }
+ clib_spinlock_unlock_if_init (&txq->lock);
+
+ return (frame->n_vectors - n_left);
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */