#include <vlib/vlib.h>
#include <vlib/unix/unix.h>
#include <vlib/pci/pci.h>
+#include <vppinfra/ring.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/devices/devices.h>
#include <avf/avf.h>
-#define AVF_TXQ_DESC_CMD(x) (1 << (x + 4))
-#define AVF_TXQ_DESC_CMD_EOP AVF_TXQ_DESC_CMD(0)
-#define AVF_TXQ_DESC_CMD_RS AVF_TXQ_DESC_CMD(1)
-#define AVF_TXQ_DESC_CMD_RSV AVF_TXQ_DESC_CMD(2)
-
static_always_inline u8
avf_tx_desc_get_dtyp (avf_tx_desc_t * d)
{
return d->qword[1] & 0x0f;
}
-VNET_DEVICE_CLASS_TX_FN (avf_device_class) (vlib_main_t * vm,
- vlib_node_runtime_t * node,
- vlib_frame_t * frame)
+static_always_inline u16
+avf_tx_enqueue (vlib_main_t * vm, vlib_node_runtime_t * node, avf_txq_t * txq,
+ u32 * buffers, u32 n_packets, int use_va_dma)
{
- avf_main_t *am = &avf_main;
- vnet_interface_output_runtime_t *rd = (void *) node->runtime_data;
- avf_device_t *ad = pool_elt_at_index (am->devices, rd->dev_instance);
- u32 thread_index = vm->thread_index;
- u8 qid = thread_index;
- avf_txq_t *txq = vec_elt_at_index (ad->txqs, qid % ad->num_queue_pairs);
- avf_tx_desc_t *d0, *d1, *d2, *d3;
- u32 *buffers = vlib_frame_args (frame);
- u32 bi0, bi1, bi2, bi3;
- u16 n_left, n_left_to_send, n_in_batch;
- vlib_buffer_t *b0, *b1, *b2, *b3;
- u16 next;
- u16 n_retry = 5;
+ u16 next = txq->next;
+ u64 bits = AVF_TXD_CMD_EOP | AVF_TXD_CMD_RSV;
+ u16 n_desc = 0;
+ u16 *slot, n_desc_left, n_packets_left = n_packets;
u16 mask = txq->size - 1;
- u64 bits = (AVF_TXQ_DESC_CMD_EOP | AVF_TXQ_DESC_CMD_RS |
- AVF_TXQ_DESC_CMD_RSV);
-
- clib_spinlock_lock_if_init (&txq->lock);
+ vlib_buffer_t *b[4];
+ avf_tx_desc_t *d = txq->descs + next;
+ u16 n_desc_needed;
+ vlib_buffer_t *b0;
- n_left_to_send = frame->n_vectors;
- next = txq->next;
-
-retry:
- /* release consumed bufs */
- if (txq->n_enqueued)
- {
- u16 first, slot, n_free = 0;
- first = slot = (next - txq->n_enqueued) & mask;
- d0 = txq->descs + slot;
- while (n_free < txq->n_enqueued && avf_tx_desc_get_dtyp (d0) == 0x0F)
- {
- n_free++;
- slot = (slot + 1) & mask;
- d0 = txq->descs + slot;
- }
-
- if (n_free)
- {
- txq->n_enqueued -= n_free;
- vlib_buffer_free_from_ring (vm, txq->bufs, first, txq->size,
- n_free);
- }
- }
+ /* avoid ring wrap */
+ n_desc_left = txq->size - clib_max (txq->next, txq->n_enqueued + 8);
- n_in_batch = clib_min (n_left_to_send, txq->size - txq->n_enqueued - 8);
- n_left = n_in_batch;
+ if (n_desc_left == 0)
+ return 0;
- while (n_left >= 8)
+ /* Fast path, no ring wrap */
+ while (n_packets_left && n_desc_left)
{
- u16 slot0, slot1, slot2, slot3;
+ u32 or_flags;
+ if (n_packets_left < 8 || n_desc_left < 4)
+ goto one_by_one;
vlib_prefetch_buffer_with_index (vm, buffers[4], LOAD);
vlib_prefetch_buffer_with_index (vm, buffers[5], LOAD);
vlib_prefetch_buffer_with_index (vm, buffers[6], LOAD);
vlib_prefetch_buffer_with_index (vm, buffers[7], LOAD);
- slot0 = next;
- slot1 = (next + 1) & mask;
- slot2 = (next + 2) & mask;
- slot3 = (next + 3) & mask;
-
- d0 = txq->descs + slot0;
- d1 = txq->descs + slot1;
- d2 = txq->descs + slot2;
- d3 = txq->descs + slot3;
-
- bi0 = buffers[0];
- bi1 = buffers[1];
- bi2 = buffers[2];
- bi3 = buffers[3];
-
- txq->bufs[slot0] = bi0;
- txq->bufs[slot1] = bi1;
- txq->bufs[slot2] = bi2;
- txq->bufs[slot3] = bi3;
- b0 = vlib_get_buffer (vm, bi0);
- b1 = vlib_get_buffer (vm, bi1);
- b2 = vlib_get_buffer (vm, bi2);
- b3 = vlib_get_buffer (vm, bi3);
-
- if (ad->flags & AVF_DEVICE_F_IOVA)
+ b[0] = vlib_get_buffer (vm, buffers[0]);
+ b[1] = vlib_get_buffer (vm, buffers[1]);
+ b[2] = vlib_get_buffer (vm, buffers[2]);
+ b[3] = vlib_get_buffer (vm, buffers[3]);
+
+ or_flags = b[0]->flags | b[1]->flags | b[2]->flags | b[3]->flags;
+
+ if (or_flags & VLIB_BUFFER_NEXT_PRESENT)
+ goto one_by_one;
+
+ vlib_buffer_copy_indices (txq->bufs + next, buffers, 4);
+
+ if (use_va_dma)
{
- d0->qword[0] = vlib_buffer_get_current_va (b0);
- d1->qword[0] = vlib_buffer_get_current_va (b1);
- d2->qword[0] = vlib_buffer_get_current_va (b2);
- d3->qword[0] = vlib_buffer_get_current_va (b3);
+ d[0].qword[0] = vlib_buffer_get_current_va (b[0]);
+ d[1].qword[0] = vlib_buffer_get_current_va (b[1]);
+ d[2].qword[0] = vlib_buffer_get_current_va (b[2]);
+ d[3].qword[0] = vlib_buffer_get_current_va (b[3]);
}
else
{
- d0->qword[0] = vlib_buffer_get_current_pa (vm, b0);
- d1->qword[0] = vlib_buffer_get_current_pa (vm, b1);
- d2->qword[0] = vlib_buffer_get_current_pa (vm, b2);
- d3->qword[0] = vlib_buffer_get_current_pa (vm, b3);
+ d[0].qword[0] = vlib_buffer_get_current_pa (vm, b[0]);
+ d[1].qword[0] = vlib_buffer_get_current_pa (vm, b[1]);
+ d[2].qword[0] = vlib_buffer_get_current_pa (vm, b[2]);
+ d[3].qword[0] = vlib_buffer_get_current_pa (vm, b[3]);
}
- d0->qword[1] = ((u64) b0->current_length) << 34 | bits;
- d1->qword[1] = ((u64) b1->current_length) << 34 | bits;
- d2->qword[1] = ((u64) b2->current_length) << 34 | bits;
- d3->qword[1] = ((u64) b3->current_length) << 34 | bits;
+ d[0].qword[1] = ((u64) b[0]->current_length) << 34 | bits;
+ d[1].qword[1] = ((u64) b[1]->current_length) << 34 | bits;
+ d[2].qword[1] = ((u64) b[2]->current_length) << 34 | bits;
+ d[3].qword[1] = ((u64) b[3]->current_length) << 34 | bits;
- next = (next + 4) & mask;
- txq->n_enqueued += 4;
+ next += 4;
+ n_desc += 4;
buffers += 4;
- n_left -= 4;
+ n_packets_left -= 4;
+ n_desc_left -= 4;
+ d += 4;
+ continue;
+
+ one_by_one:
+ txq->bufs[next] = buffers[0];
+ b[0] = vlib_get_buffer (vm, buffers[0]);
+
+ /* Deal with chain buffer if present */
+ if (b[0]->flags & VLIB_BUFFER_NEXT_PRESENT)
+ {
+ n_desc_needed = 1;
+ b0 = b[0];
+
+ /* Wish there were a buffer count for chain buffer */
+ while (b0->flags & VLIB_BUFFER_NEXT_PRESENT)
+ {
+ b0 = vlib_get_buffer (vm, b0->next_buffer);
+ n_desc_needed++;
+ }
+
+ /* spec says data descriptor is limited to 8 segments */
+ if (PREDICT_FALSE (n_desc_needed > 8))
+ {
+ vlib_buffer_free_one (vm, buffers[0]);
+ vlib_error_count (vm, node->node_index,
+ AVF_TX_ERROR_SEGMENT_SIZE_EXCEEDED, 1);
+ n_packets_left -= 1;
+ buffers += 1;
+ continue;
+ }
+
+ if (PREDICT_FALSE (n_desc_left < n_desc_needed))
+ /*
+ * Slow path may be able to to deal with this since it can handle
+ * ring wrap
+ */
+ break;
+
+ while (b[0]->flags & VLIB_BUFFER_NEXT_PRESENT)
+ {
+ if (use_va_dma)
+ d[0].qword[0] = vlib_buffer_get_current_va (b[0]);
+ else
+ d[0].qword[0] = vlib_buffer_get_current_pa (vm, b[0]);
+
+ d[0].qword[1] = (((u64) b[0]->current_length) << 34) |
+ AVF_TXD_CMD_RSV;
+
+ next += 1;
+ n_desc += 1;
+ n_desc_left -= 1;
+ d += 1;
+
+ txq->bufs[next] = b[0]->next_buffer;
+ b[0] = vlib_get_buffer (vm, b[0]->next_buffer);
+ }
+ }
+
+ if (use_va_dma)
+ d[0].qword[0] = vlib_buffer_get_current_va (b[0]);
+ else
+ d[0].qword[0] = vlib_buffer_get_current_pa (vm, b[0]);
+
+ d[0].qword[1] = (((u64) b[0]->current_length) << 34) | bits;
+
+ next += 1;
+ n_desc += 1;
+ buffers += 1;
+ n_packets_left -= 1;
+ n_desc_left -= 1;
+ d += 1;
}
- while (n_left)
+ /* Slow path to support ring wrap */
+ if (PREDICT_FALSE (n_packets_left))
{
- d0 = txq->descs + next;
- bi0 = buffers[0];
- txq->bufs[next] = bi0;
- b0 = vlib_get_buffer (vm, bi0);
+ txq->n_enqueued += n_desc;
- if (ad->flags & AVF_DEVICE_F_IOVA)
- d0->qword[0] = vlib_buffer_get_current_va (b0);
- else
- d0->qword[0] = vlib_buffer_get_current_pa (vm, b0);
+ n_desc = 0;
+ d = txq->descs + (next & mask);
+
+ /* +8 to be consistent with fast path */
+ n_desc_left = txq->size - (txq->n_enqueued + 8);
+
+ while (n_packets_left && n_desc_left)
+ {
+ txq->bufs[next & mask] = buffers[0];
+ b[0] = vlib_get_buffer (vm, buffers[0]);
- d0->qword[1] = (((u64) b0->current_length) << 34) | bits;
+ /* Deal with chain buffer if present */
+ if (b[0]->flags & VLIB_BUFFER_NEXT_PRESENT)
+ {
+ n_desc_needed = 1;
+ b0 = b[0];
- next = (next + 1) & mask;
- txq->n_enqueued++;
- buffers++;
- n_left--;
+ while (b0->flags & VLIB_BUFFER_NEXT_PRESENT)
+ {
+ b0 = vlib_get_buffer (vm, b0->next_buffer);
+ n_desc_needed++;
+ }
+
+ /* Spec says data descriptor is limited to 8 segments */
+ if (PREDICT_FALSE (n_desc_needed > 8))
+ {
+ vlib_buffer_free_one (vm, buffers[0]);
+ vlib_error_count (vm, node->node_index,
+ AVF_TX_ERROR_SEGMENT_SIZE_EXCEEDED, 1);
+ n_packets_left -= 1;
+ buffers += 1;
+ continue;
+ }
+
+ if (PREDICT_FALSE (n_desc_left < n_desc_needed))
+ break;
+
+ while (b[0]->flags & VLIB_BUFFER_NEXT_PRESENT)
+ {
+ if (use_va_dma)
+ d[0].qword[0] = vlib_buffer_get_current_va (b[0]);
+ else
+ d[0].qword[0] = vlib_buffer_get_current_pa (vm, b[0]);
+
+ d[0].qword[1] = (((u64) b[0]->current_length) << 34) |
+ AVF_TXD_CMD_RSV;
+
+ next += 1;
+ n_desc += 1;
+ n_desc_left -= 1;
+ d = txq->descs + (next & mask);
+
+ txq->bufs[next & mask] = b[0]->next_buffer;
+ b[0] = vlib_get_buffer (vm, b[0]->next_buffer);
+ }
+ }
+
+ if (use_va_dma)
+ d[0].qword[0] = vlib_buffer_get_current_va (b[0]);
+ else
+ d[0].qword[0] = vlib_buffer_get_current_pa (vm, b[0]);
+
+ d[0].qword[1] = (((u64) b[0]->current_length) << 34) | bits;
+
+ next += 1;
+ n_desc += 1;
+ buffers += 1;
+ n_packets_left -= 1;
+ n_desc_left -= 1;
+ d = txq->descs + (next & mask);
+ }
+ }
+
+ if ((slot = clib_ring_enq (txq->rs_slots)))
+ {
+ u16 rs_slot = slot[0] = (next - 1) & mask;
+ d = txq->descs + rs_slot;
+ d[0].qword[1] |= AVF_TXD_CMD_RS;
}
CLIB_MEMORY_BARRIER ();
- *(txq->qtx_tail) = txq->next = next;
+ *(txq->qtx_tail) = txq->next = next & mask;
+ txq->n_enqueued += n_desc;
+ return n_packets - n_packets_left;
+}
- n_left_to_send -= n_in_batch;
+VNET_DEVICE_CLASS_TX_FN (avf_device_class) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ avf_main_t *am = &avf_main;
+ vnet_interface_output_runtime_t *rd = (void *) node->runtime_data;
+ avf_device_t *ad = pool_elt_at_index (am->devices, rd->dev_instance);
+ u32 thread_index = vm->thread_index;
+ u8 qid = thread_index;
+ avf_txq_t *txq = vec_elt_at_index (ad->txqs, qid % ad->num_queue_pairs);
+ u32 *buffers = vlib_frame_vector_args (frame);
+ u16 n_enq, n_left;
+ u16 n_retry = 2;
- if (n_left_to_send)
+ clib_spinlock_lock_if_init (&txq->lock);
+
+ n_left = frame->n_vectors;
+
+retry:
+ /* release consumed bufs */
+ if (txq->n_enqueued)
{
+ i32 complete_slot = -1;
+ while (1)
+ {
+ u16 *slot = clib_ring_get_first (txq->rs_slots);
+
+ if (slot == 0)
+ break;
+
+ if (avf_tx_desc_get_dtyp (txq->descs + slot[0]) != 0x0F)
+ break;
+
+ complete_slot = slot[0];
+
+ clib_ring_deq (txq->rs_slots);
+ }
+
+ if (complete_slot >= 0)
+ {
+ u16 first, mask, n_free;
+ mask = txq->size - 1;
+ first = (txq->next - txq->n_enqueued) & mask;
+ n_free = (complete_slot + 1 - first) & mask;
+
+ txq->n_enqueued -= n_free;
+ vlib_buffer_free_from_ring_no_next (vm, txq->bufs, first, txq->size,
+ n_free);
+ }
+ }
+
+ if (ad->flags & AVF_DEVICE_F_VA_DMA)
+ n_enq = avf_tx_enqueue (vm, node, txq, buffers, n_left, 1);
+ else
+ n_enq = avf_tx_enqueue (vm, node, txq, buffers, n_left, 0);
+
+ n_left -= n_enq;
+
+ if (n_left)
+ {
+ buffers += n_enq;
+
if (n_retry--)
goto retry;
- vlib_buffer_free (vm, buffers, n_left_to_send);
+ vlib_buffer_free (vm, buffers, n_left);
vlib_error_count (vm, node->node_index,
- AVF_TX_ERROR_NO_FREE_SLOTS, n_left_to_send);
+ AVF_TX_ERROR_NO_FREE_SLOTS, n_left);
}
clib_spinlock_unlock_if_init (&txq->lock);
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