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/*
*------------------------------------------------------------------
* 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 <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>
static_always_inline u8
avf_tx_desc_get_dtyp (avf_tx_desc_t * d)
{
return d->qword[1] & 0x0f;
}
struct avf_ip4_psh
{
u32 src;
u32 dst;
u8 zero;
u8 proto;
u16 l4len;
};
struct avf_ip6_psh
{
u32 src[4];
u32 dst[4];
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_IP_CKSUM |
VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
VNET_BUFFER_F_OFFLOAD_UDP_CKSUM))))
return 0;
u32 is_tcp = is_tso || b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
u32 is_udp = !is_tso && b->flags & VNET_BUFFER_F_OFFLOAD_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 = vnet_buffer (b)->l2_hdr_offset;
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 };
clib_memcpy_fast (&psh.src, &ip6->src_address, 32);
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 -
vnet_buffer (b)->l2_hdr_offset + 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, 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_IP_CKSUM |
VNET_BUFFER_F_OFFLOAD_TCP_CKSUM | VNET_BUFFER_F_OFFLOAD_UDP_CKSUM |
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;
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);
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 | offload_mask))
goto one_by_one;
vlib_buffer_copy_indices (txq->bufs + next, buffers, 4);
if (use_va_dma)
{
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
{
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]);
}
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 += 4;
n_desc += 4;
buffers += 4;
n_packets_left -= 4;
n_desc_left -= 4;
d += 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 |
one_by_one_offload_flags;
next += 1;
n_desc += 1;
buffers += 1;
n_packets_left -= 1;
n_desc_left -= 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 = txq->descs + rs_slot;
d[0].qword[1] |= AVF_TXD_CMD_RS;
}
txq->next = next & mask;
clib_atomic_store_rel_n (txq->qtx_tail, txq->next);
txq->n_enqueued += n_desc;
return n_packets - n_packets_left;
}
VNET_DEVICE_CLASS_TX_FN (avf_device_class) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
vnet_interface_output_runtime_t *rd = (void *) node->runtime_data;
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 = 2;
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);
vlib_error_count (vm, node->node_index,
AVF_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:
*/
|