#include <vlib/unix/unix.h>
#include <vlib/pci/pci.h>
#include <vppinfra/ring.h>
+
#include <vnet/ethernet/ethernet.h>
+#include <vnet/ip/ip4_packet.h>
+#include <vnet/ip/ip6_packet.h>
+#include <vnet/udp/udp_packet.h>
+#include <vnet/tcp/tcp_packet.h>
+
#include <vnet/devices/devices.h>
#include <avf/avf.h>
return d->qword[1] & 0x0f;
}
+struct avf_ip4_psh
+{
+ u32 src;
+ u32 dst;
+ u8 zero;
+ u8 proto;
+ u16 l4len;
+};
+
+struct avf_ip6_psh
+{
+ ip6_address_t src;
+ ip6_address_t dst;
+ u32 l4len;
+ u32 proto;
+};
+
+static_always_inline u64
+avf_tx_prepare_cksum (vlib_buffer_t * b, u8 is_tso)
+{
+ u64 flags = 0;
+ if (!is_tso && !(b->flags & VNET_BUFFER_F_OFFLOAD))
+ return 0;
+
+ u32 oflags = vnet_buffer2 (b)->oflags;
+ u32 is_tcp = is_tso || oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM;
+ u32 is_udp = !is_tso && oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM;
+ u32 is_ip4 = b->flags & VNET_BUFFER_F_IS_IP4;
+ u32 is_ip6 = b->flags & VNET_BUFFER_F_IS_IP6;
+ ASSERT (!is_tcp || !is_udp);
+ ASSERT (is_ip4 || is_ip6);
+ i16 l2_hdr_offset = b->current_data;
+ i16 l3_hdr_offset = vnet_buffer (b)->l3_hdr_offset;
+ i16 l4_hdr_offset = vnet_buffer (b)->l4_hdr_offset;
+ u16 l2_len = l3_hdr_offset - l2_hdr_offset;
+ u16 l3_len = l4_hdr_offset - l3_hdr_offset;
+ ip4_header_t *ip4 = (void *) (b->data + l3_hdr_offset);
+ ip6_header_t *ip6 = (void *) (b->data + l3_hdr_offset);
+ tcp_header_t *tcp = (void *) (b->data + l4_hdr_offset);
+ udp_header_t *udp = (void *) (b->data + l4_hdr_offset);
+ u16 l4_len =
+ is_tcp ? tcp_header_bytes (tcp) : is_udp ? sizeof (udp_header_t) : 0;
+ u16 sum = 0;
+
+ flags |= AVF_TXD_OFFSET_MACLEN (l2_len) |
+ AVF_TXD_OFFSET_IPLEN (l3_len) | AVF_TXD_OFFSET_L4LEN (l4_len);
+ flags |= is_ip4 ? AVF_TXD_CMD_IIPT_IPV4 : AVF_TXD_CMD_IIPT_IPV6;
+ flags |= is_tcp ? AVF_TXD_CMD_L4T_TCP : is_udp ? AVF_TXD_CMD_L4T_UDP : 0;
+
+ if (is_ip4)
+ ip4->checksum = 0;
+
+ if (is_tso)
+ {
+ if (is_ip4)
+ ip4->length = 0;
+ else
+ ip6->payload_length = 0;
+ }
+
+ if (is_tcp || is_udp)
+ {
+ if (is_ip4)
+ {
+ struct avf_ip4_psh psh = { 0 };
+ psh.src = ip4->src_address.as_u32;
+ psh.dst = ip4->dst_address.as_u32;
+ psh.proto = ip4->protocol;
+ psh.l4len =
+ is_tso ? 0 :
+ clib_host_to_net_u16 (clib_net_to_host_u16 (ip4->length) -
+ (l4_hdr_offset - l3_hdr_offset));
+ sum = ~ip_csum (&psh, sizeof (psh));
+ }
+ else
+ {
+ struct avf_ip6_psh psh = { 0 };
+ psh.src = ip6->src_address;
+ psh.dst = ip6->dst_address;
+ psh.proto = clib_host_to_net_u32 ((u32) ip6->protocol);
+ psh.l4len = is_tso ? 0 : ip6->payload_length;
+ sum = ~ip_csum (&psh, sizeof (psh));
+ }
+ }
+ /* ip_csum does a byte swap for some reason... */
+ sum = clib_net_to_host_u16 (sum);
+ if (is_tcp)
+ tcp->checksum = sum;
+ else if (is_udp)
+ udp->checksum = sum;
+ return flags;
+}
+
+static_always_inline int
+avf_tx_fill_ctx_desc (vlib_main_t * vm, avf_txq_t * txq, avf_tx_desc_t * d,
+ vlib_buffer_t * b)
+{
+ vlib_buffer_t *ctx_ph = vlib_get_buffer (vm, txq->ctx_desc_placeholder_bi);
+ if (PREDICT_FALSE (ctx_ph->ref_count == 255))
+ {
+ /* We need a new placeholder buffer */
+ u32 new_bi;
+ u8 bpi = vlib_buffer_pool_get_default_for_numa (vm, vm->numa_node);
+ if (PREDICT_TRUE
+ (vlib_buffer_alloc_from_pool (vm, &new_bi, 1, bpi) == 1))
+ {
+ /* Remove our own reference on the current placeholder buffer */
+ ctx_ph->ref_count--;
+ /* Replace with the new placeholder buffer */
+ txq->ctx_desc_placeholder_bi = new_bi;
+ ctx_ph = vlib_get_buffer (vm, new_bi);
+ }
+ else
+ /* Impossible to enqueue a ctx descriptor, fail */
+ return 1;
+ }
+
+ /* Acquire a reference on the placeholder buffer */
+ ctx_ph->ref_count++;
+
+ u16 l234hdr_sz = vnet_buffer (b)->l4_hdr_offset - b->current_data +
+ vnet_buffer2 (b)->gso_l4_hdr_sz;
+ u16 tlen = vlib_buffer_length_in_chain (vm, b) - l234hdr_sz;
+ d[0].qword[0] = 0;
+ d[0].qword[1] = AVF_TXD_DTYP_CTX | AVF_TXD_CTX_CMD_TSO
+ | AVF_TXD_CTX_SEG_MSS (vnet_buffer2 (b)->gso_size) |
+ AVF_TXD_CTX_SEG_TLEN (tlen);
+ return 0;
+}
+
+
static_always_inline u16
-avf_tx_enqueue (vlib_main_t * vm, avf_txq_t * txq, u32 * buffers,
- u32 n_packets, int use_va_dma)
+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)
{
u16 next = txq->next;
u64 bits = AVF_TXD_CMD_EOP | AVF_TXD_CMD_RSV;
+ const u32 offload_mask = VNET_BUFFER_F_OFFLOAD | VNET_BUFFER_F_GSO;
+ u64 one_by_one_offload_flags = 0;
+ int is_tso;
u16 n_desc = 0;
u16 *slot, n_desc_left, n_packets_left = n_packets;
u16 mask = txq->size - 1;
vlib_buffer_t *b[4];
avf_tx_desc_t *d = txq->descs + next;
+ u16 n_desc_needed;
+ vlib_buffer_t *b0;
/* avoid ring wrap */
n_desc_left = txq->size - clib_max (txq->next, txq->n_enqueued + 8);
+ if (n_desc_left == 0)
+ return 0;
+
+ /* Fast path, no ring wrap */
while (n_packets_left && n_desc_left)
{
u32 or_flags;
or_flags = b[0]->flags | b[1]->flags | b[2]->flags | b[3]->flags;
- if (or_flags & VLIB_BUFFER_NEXT_PRESENT)
+ if (or_flags & (VLIB_BUFFER_NEXT_PRESENT | offload_mask))
goto one_by_one;
vlib_buffer_copy_indices (txq->bufs + next, buffers, 4);
continue;
one_by_one:
+ one_by_one_offload_flags = 0;
txq->bufs[next] = buffers[0];
b[0] = vlib_get_buffer (vm, buffers[0]);
+ is_tso = ! !(b[0]->flags & VNET_BUFFER_F_GSO);
+ if (PREDICT_FALSE (is_tso || b[0]->flags & offload_mask))
+ one_by_one_offload_flags |= avf_tx_prepare_cksum (b[0], is_tso);
+
+ /* Deal with chain buffer if present */
+ if (is_tso || b[0]->flags & VLIB_BUFFER_NEXT_PRESENT)
+ {
+ n_desc_needed = 1 + is_tso;
+ 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 (!is_tso && 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;
+
+ /* Enqueue a context descriptor if needed */
+ if (PREDICT_FALSE (is_tso))
+ {
+ if (avf_tx_fill_ctx_desc (vm, txq, d, b[0]))
+ /* Failure to acquire ref on ctx placeholder */
+ break;
+ txq->bufs[next + 1] = txq->bufs[next];
+ txq->bufs[next] = txq->ctx_desc_placeholder_bi;
+ next += 1;
+ n_desc += 1;
+ n_desc_left -= 1;
+ d += 1;
+ }
+ 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 | one_by_one_offload_flags;
+
+ 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;
+ d[0].qword[1] =
+ (((u64) b[0]->current_length) << 34) | bits |
+ one_by_one_offload_flags;
next += 1;
n_desc += 1;
d += 1;
}
+ /* Slow path to support ring wrap */
+ if (PREDICT_FALSE (n_packets_left))
+ {
+ txq->n_enqueued += n_desc;
+
+ 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]);
+
+ one_by_one_offload_flags = 0;
+ is_tso = ! !(b[0]->flags & VNET_BUFFER_F_GSO);
+ if (PREDICT_FALSE (is_tso || b[0]->flags & offload_mask))
+ one_by_one_offload_flags |= avf_tx_prepare_cksum (b[0], is_tso);
+
+ /* Deal with chain buffer if present */
+ if (is_tso || b[0]->flags & VLIB_BUFFER_NEXT_PRESENT)
+ {
+ n_desc_needed = 1 + is_tso;
+ b0 = b[0];
+
+ 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 (!is_tso && 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;
+
+ /* Enqueue a context descriptor if needed */
+ if (PREDICT_FALSE (is_tso))
+ {
+ if (avf_tx_fill_ctx_desc (vm, txq, d, b[0]))
+ /* Failure to acquire ref on ctx placeholder */
+ break;
+
+ txq->bufs[(next + 1) & mask] = txq->bufs[next & mask];
+ txq->bufs[next & mask] = txq->ctx_desc_placeholder_bi;
+ next += 1;
+ n_desc += 1;
+ n_desc_left -= 1;
+ d = txq->descs + (next & mask);
+ }
+ 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 | one_by_one_offload_flags;
+
+ 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 |
+ one_by_one_offload_flags;
+
+ 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[0].qword[1] |= AVF_TXD_CMD_RS;
}
- CLIB_MEMORY_BARRIER ();
- *(txq->qtx_tail) = txq->next = next & mask;
+ txq->next = next & mask;
+ avf_tail_write (txq->qtx_tail, txq->next);
txq->n_enqueued += n_desc;
return n_packets - n_packets_left;
}
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);
+ avf_device_t *ad = avf_get_device (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 = 5;
+ u16 n_retry = 2;
clib_spinlock_lock_if_init (&txq->lock);
if (slot == 0)
break;
- complete_slot = slot[0];
- if (avf_tx_desc_get_dtyp (txq->descs + complete_slot) != 0x0F)
+ if (avf_tx_desc_get_dtyp (txq->descs + slot[0]) != 0x0F)
break;
+ complete_slot = slot[0];
+
clib_ring_deq (txq->rs_slots);
}
n_free = (complete_slot + 1 - first) & mask;
txq->n_enqueued -= n_free;
- vlib_buffer_free_from_ring (vm, txq->bufs, first, txq->size,
- 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, txq, buffers, n_left, 1);
+ n_enq = avf_tx_enqueue (vm, node, txq, buffers, n_left, 1);
else
- n_enq = avf_tx_enqueue (vm, txq, buffers, n_left, 0);
+ n_enq = avf_tx_enqueue (vm, node, txq, buffers, n_left, 0);
n_left -= n_enq;
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