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8f49936b20508d57968f01dcb18f8d31b1a58f3f
vpp/src/plugins/avf/input.c
Damjan Marion 8f49936b20 vlib: introduce vlib_buffer_get_{pa,va,current_va,current_pa} inlines 
Change-Id: I0b42ac6b05bc9910904a97924ea4bebc84507d4d
Signed-off-by: Damjan Marion <damarion@cisco.com>
2018-10-22 13:01:19 +00:00

548 lines
16 KiB
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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 <vnet/ethernet/ethernet.h>
#include <vnet/devices/devices.h>
#include <avf/avf.h>
#define foreach_avf_input_error \
_(BUFFER_ALLOC, "buffer alloc error") \
_(RX_PACKET_ERROR, "Rx packet errors")
typedef enum
{
#define _(f,s) AVF_INPUT_ERROR_##f,
foreach_avf_input_error
#undef _
AVF_INPUT_N_ERROR,
} avf_input_error_t;
static __clib_unused char *avf_input_error_strings[] = {
#define _(n,s) s,
foreach_avf_input_error
#undef _
};
#define AVF_RX_DESC_STATUS(x) (1 << x)
#define AVF_RX_DESC_STATUS_DD AVF_RX_DESC_STATUS(0)
#define AVF_RX_DESC_STATUS_EOP AVF_RX_DESC_STATUS(1)
#define AVF_INPUT_REFILL_TRESHOLD 32
static_always_inline void
avf_rxq_refill (vlib_main_t * vm, vlib_node_runtime_t * node, avf_rxq_t * rxq,
int use_iova)
{
u16 n_refill, mask, n_alloc, slot;
u32 s0, s1, s2, s3;
vlib_buffer_t *b[4];
avf_rx_desc_t *d[4];
n_refill = rxq->size - 1 - rxq->n_enqueued;
if (PREDICT_TRUE (n_refill <= AVF_INPUT_REFILL_TRESHOLD))
return;
mask = rxq->size - 1;
slot = (rxq->next - n_refill - 1) & mask;
n_refill &= ~7; /* round to 8 */
n_alloc = vlib_buffer_alloc_to_ring (vm, rxq->bufs, slot, rxq->size,
n_refill);
if (PREDICT_FALSE (n_alloc != n_refill))
{
vlib_error_count (vm, node->node_index,
AVF_INPUT_ERROR_BUFFER_ALLOC, 1);
if (n_alloc)
vlib_buffer_free_from_ring (vm, rxq->bufs, slot, rxq->size, n_alloc);
return;
}
rxq->n_enqueued += n_alloc;
while (n_alloc >= 4)
{
if (PREDICT_TRUE (slot + 3 < rxq->size))
{
s0 = slot;
s1 = slot + 1;
s2 = slot + 2;
s3 = slot + 3;
}
else
{
s0 = slot;
s1 = (slot + 1) & mask;
s2 = (slot + 2) & mask;
s3 = (slot + 3) & mask;
}
d[0] = ((avf_rx_desc_t *) rxq->descs) + s0;
d[1] = ((avf_rx_desc_t *) rxq->descs) + s1;
d[2] = ((avf_rx_desc_t *) rxq->descs) + s2;
d[3] = ((avf_rx_desc_t *) rxq->descs) + s3;
b[0] = vlib_get_buffer (vm, rxq->bufs[s0]);
b[1] = vlib_get_buffer (vm, rxq->bufs[s1]);
b[2] = vlib_get_buffer (vm, rxq->bufs[s2]);
b[3] = vlib_get_buffer (vm, rxq->bufs[s3]);
if (use_iova)
{
d[0]->qword[0] = vlib_buffer_get_va (b[0]);
d[1]->qword[0] = vlib_buffer_get_va (b[1]);
d[2]->qword[0] = vlib_buffer_get_va (b[2]);
d[3]->qword[0] = vlib_buffer_get_va (b[3]);
}
else
{
d[0]->qword[0] = vlib_buffer_get_pa (vm, b[0]);
d[1]->qword[0] = vlib_buffer_get_pa (vm, b[1]);
d[2]->qword[0] = vlib_buffer_get_pa (vm, b[2]);
d[3]->qword[0] = vlib_buffer_get_pa (vm, b[3]);
}
d[0]->qword[1] = 0;
d[1]->qword[1] = 0;
d[2]->qword[1] = 0;
d[3]->qword[1] = 0;
/* next */
slot = (slot + 4) & mask;
n_alloc -= 4;
}
while (n_alloc)
{
s0 = slot;
d[0] = ((avf_rx_desc_t *) rxq->descs) + s0;
b[0] = vlib_get_buffer (vm, rxq->bufs[s0]);
if (use_iova)
d[0]->qword[0] = vlib_buffer_get_va (b[0]);
else
d[0]->qword[0] = vlib_buffer_get_pa (vm, b[0]);
d[0]->qword[1] = 0;
/* next */
slot = (slot + 1) & mask;
n_alloc -= 1;
}
CLIB_MEMORY_BARRIER ();
*(rxq->qrx_tail) = slot;
}
static_always_inline void
avf_check_for_error (vlib_node_runtime_t * node, avf_rx_vector_entry_t * rxve,
vlib_buffer_t * b, u16 * next)
{
avf_main_t *am = &avf_main;
avf_ptype_t *ptype;
if (PREDICT_FALSE (rxve->error))
{
b->error = node->errors[AVF_INPUT_ERROR_RX_PACKET_ERROR];
ptype = am->ptypes + rxve->ptype;
/* retract */
vlib_buffer_advance (b, --ptype->buffer_advance);
*next = VNET_DEVICE_INPUT_NEXT_DROP;
}
}
static_always_inline u32
avf_find_next (avf_rx_vector_entry_t * rxve, vlib_buffer_t * b,
int maybe_tagged)
{
avf_main_t *am = &avf_main;
ethernet_header_t *e = (ethernet_header_t *) b->data;
avf_ptype_t *ptype;
if (maybe_tagged && ethernet_frame_is_tagged (e->type))
return VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
ptype = am->ptypes + rxve->ptype;
vlib_buffer_advance (b, ptype->buffer_advance);
b->flags |= ptype->flags;
return ptype->next_node;
}
static_always_inline uword
avf_process_rx_burst (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_buffer_t * bt, avf_rx_vector_entry_t * rxve,
vlib_buffer_t ** b, u16 * next, u32 n_rxv,
u8 maybe_error, int known_next)
{
uword n_rx_bytes = 0;
while (n_rxv >= 4)
{
if (n_rxv >= 12)
{
vlib_prefetch_buffer_header (b[8], LOAD);
vlib_prefetch_buffer_header (b[9], LOAD);
vlib_prefetch_buffer_header (b[10], LOAD);
vlib_prefetch_buffer_header (b[11], LOAD);
if (!known_next)
{
CLIB_PREFETCH (b[8]->data, CLIB_CACHE_LINE_BYTES, LOAD);
CLIB_PREFETCH (b[9]->data, CLIB_CACHE_LINE_BYTES, LOAD);
CLIB_PREFETCH (b[10]->data, CLIB_CACHE_LINE_BYTES, LOAD);
CLIB_PREFETCH (b[11]->data, CLIB_CACHE_LINE_BYTES, LOAD);
}
}
n_rx_bytes += b[0]->current_length = rxve[0].length;
n_rx_bytes += b[1]->current_length = rxve[1].length;
n_rx_bytes += b[2]->current_length = rxve[2].length;
n_rx_bytes += b[3]->current_length = rxve[3].length;
if (!known_next)
{
ethernet_header_t *e0, *e1, *e2, *e3;
e0 = (ethernet_header_t *) b[0]->data;
e1 = (ethernet_header_t *) b[1]->data;
e2 = (ethernet_header_t *) b[2]->data;
e3 = (ethernet_header_t *) b[3]->data;
if (ethernet_frame_is_any_tagged_x4 (e0->type, e1->type,
e2->type, e3->type))
{
next[0] = avf_find_next (rxve, b[0], 1);
next[1] = avf_find_next (rxve + 1, b[1], 1);
next[2] = avf_find_next (rxve + 2, b[2], 1);
next[3] = avf_find_next (rxve + 3, b[3], 1);
}
else
{
next[0] = avf_find_next (rxve, b[0], 0);
next[1] = avf_find_next (rxve + 1, b[1], 0);
next[2] = avf_find_next (rxve + 2, b[2], 0);
next[3] = avf_find_next (rxve + 3, b[3], 0);
}
if (PREDICT_FALSE (maybe_error))
{
avf_check_for_error (node, rxve + 0, b[0], next);
avf_check_for_error (node, rxve + 1, b[1], next + 1);
avf_check_for_error (node, rxve + 2, b[2], next + 2);
avf_check_for_error (node, rxve + 3, b[3], next + 3);
}
}
else if (bt->current_config_index)
{
b[0]->current_config_index = bt->current_config_index;
b[1]->current_config_index = bt->current_config_index;
b[2]->current_config_index = bt->current_config_index;
b[3]->current_config_index = bt->current_config_index;
vnet_buffer (b[0])->feature_arc_index =
vnet_buffer (bt)->feature_arc_index;
vnet_buffer (b[1])->feature_arc_index =
vnet_buffer (bt)->feature_arc_index;
vnet_buffer (b[2])->feature_arc_index =
vnet_buffer (bt)->feature_arc_index;
vnet_buffer (b[3])->feature_arc_index =
vnet_buffer (bt)->feature_arc_index;
}
clib_memcpy (vnet_buffer (b[0])->sw_if_index,
vnet_buffer (bt)->sw_if_index, 2 * sizeof (u32));
clib_memcpy (vnet_buffer (b[1])->sw_if_index,
vnet_buffer (bt)->sw_if_index, 2 * sizeof (u32));
clib_memcpy (vnet_buffer (b[2])->sw_if_index,
vnet_buffer (bt)->sw_if_index, 2 * sizeof (u32));
clib_memcpy (vnet_buffer (b[3])->sw_if_index,
vnet_buffer (bt)->sw_if_index, 2 * sizeof (u32));
VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[0]);
VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[1]);
VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[2]);
VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[3]);
/* next */
rxve += 4;
b += 4;
next += 4;
n_rxv -= 4;
}
while (n_rxv)
{
b[0]->current_length = rxve->length;
n_rx_bytes += b[0]->current_length;
if (!known_next)
{
next[0] = avf_find_next (rxve, b[0], 1);
avf_check_for_error (node, rxve + 0, b[0], next);
}
else if (bt->current_config_index)
{
b[0]->current_config_index = bt->current_config_index;
vnet_buffer (b[0])->feature_arc_index =
vnet_buffer (bt)->feature_arc_index;
}
clib_memcpy (vnet_buffer (b[0])->sw_if_index,
vnet_buffer (bt)->sw_if_index, 2 * sizeof (u32));
VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[0]);
/* next */
rxve += 1;
b += 1;
next += 1;
n_rxv -= 1;
}
return n_rx_bytes;
}
static_always_inline uword
avf_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * frame, avf_device_t * ad, u16 qid)
{
avf_main_t *am = &avf_main;
vnet_main_t *vnm = vnet_get_main ();
u32 thr_idx = vlib_get_thread_index ();
avf_per_thread_data_t *ptd =
vec_elt_at_index (am->per_thread_data, thr_idx);
avf_rxq_t *rxq = vec_elt_at_index (ad->rxqs, qid);
avf_rx_vector_entry_t *rxve = 0;
uword n_trace;
avf_rx_desc_t *d;
u32 n_rx_packets = 0, n_rx_bytes = 0;
u16 mask = rxq->size - 1;
u16 n_rxv = 0;
u8 maybe_error = 0;
u32 buffer_indices[AVF_RX_VECTOR_SZ], *bi;
u16 nexts[AVF_RX_VECTOR_SZ], *next;
vlib_buffer_t *bufs[AVF_RX_VECTOR_SZ];
vlib_buffer_t *bt = &ptd->buffer_template;
int known_next = 0;
u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
STATIC_ASSERT_SIZEOF (avf_rx_vector_entry_t, 8);
STATIC_ASSERT_OFFSET_OF (avf_rx_vector_entry_t, status, 0);
STATIC_ASSERT_OFFSET_OF (avf_rx_vector_entry_t, length, 4);
STATIC_ASSERT_OFFSET_OF (avf_rx_vector_entry_t, ptype, 6);
STATIC_ASSERT_OFFSET_OF (avf_rx_vector_entry_t, error, 7);
/* fetch up to AVF_RX_VECTOR_SZ from the rx ring, unflatten them and
copy needed data from descriptor to rx vector */
d = rxq->descs + rxq->next;
bi = buffer_indices;
while (n_rxv < AVF_RX_VECTOR_SZ)
{
if (rxq->next + 11 < rxq->size)
{
int stride = 8;
CLIB_PREFETCH ((void *) (rxq->descs + (rxq->next + stride)),
CLIB_CACHE_LINE_BYTES, LOAD);
CLIB_PREFETCH ((void *) (rxq->descs + (rxq->next + stride + 1)),
CLIB_CACHE_LINE_BYTES, LOAD);
CLIB_PREFETCH ((void *) (rxq->descs + (rxq->next + stride + 2)),
CLIB_CACHE_LINE_BYTES, LOAD);
CLIB_PREFETCH ((void *) (rxq->descs + (rxq->next + stride + 3)),
CLIB_CACHE_LINE_BYTES, LOAD);
}
#ifdef CLIB_HAVE_VEC256
u64x4 q1x4, v, err4;
u64x4 status_dd_eop_mask = u64x4_splat (0x3);
if (n_rxv >= AVF_RX_VECTOR_SZ - 4)
goto one_by_one;
if (rxq->next >= rxq->size - 4)
goto one_by_one;
/* load 1st quadword of 4 dscriptors into 256-bit vector register */
/* *INDENT-OFF* */
q1x4 = (u64x4) {
d[0].qword[1],
d[1].qword[1],
d[2].qword[1],
d[3].qword[1]
};
/* *INDENT-ON* */
/* not all packets are ready or at least one of them is chained */
if (!u64x4_is_equal (q1x4 & status_dd_eop_mask, status_dd_eop_mask))
goto one_by_one;
/* shift and mask status, length, ptype and err */
v = q1x4 & u64x4_splat ((u64) 0x3FFFFULL);
v |= (q1x4 >> 6) & u64x4_splat ((u64) 0xFFFF << 32);
v |= (q1x4 << 18) & u64x4_splat ((u64) 0xFF << 48);
v |= err4 = (q1x4 << 37) & u64x4_splat ((u64) 0xFF << 56);
u64x4_store_unaligned (v, ptd->rx_vector + n_rxv);
maybe_error |= !u64x4_is_all_zero (err4);
clib_memcpy (bi, rxq->bufs + rxq->next, 4 * sizeof (u32));
/* next */
rxq->next = (rxq->next + 4) & mask;
d = rxq->descs + rxq->next;
n_rxv += 4;
rxq->n_enqueued -= 4;
bi += 4;
continue;
one_by_one:
#endif
CLIB_PREFETCH ((void *) (rxq->descs + ((rxq->next + 8) & mask)),
CLIB_CACHE_LINE_BYTES, LOAD);
if ((d->qword[1] & AVF_RX_DESC_STATUS_DD) == 0)
break;
rxve = ptd->rx_vector + n_rxv;
bi[0] = rxq->bufs[rxq->next];
rxve->status = avf_get_u64_bits ((void *) d, 8, 18, 0);
rxve->error = avf_get_u64_bits ((void *) d, 8, 26, 19);
rxve->ptype = avf_get_u64_bits ((void *) d, 8, 37, 30);
rxve->length = avf_get_u64_bits ((void *) d, 8, 63, 38);
maybe_error |= rxve->error;
/* deal with chained buffers */
while (PREDICT_FALSE ((d->qword[1] & AVF_RX_DESC_STATUS_EOP) == 0))
{
clib_error ("fixme");
}
/* next */
rxq->next = (rxq->next + 1) & mask;
d = rxq->descs + rxq->next;
n_rxv++;
rxq->n_enqueued--;
bi++;
}
if (n_rxv == 0)
goto done;
/* refill rx ring */
if (ad->flags & AVF_DEVICE_F_IOVA)
avf_rxq_refill (vm, node, rxq, 1 /* use_iova */ );
else
avf_rxq_refill (vm, node, rxq, 0 /* use_iova */ );
vlib_get_buffers (vm, buffer_indices, bufs, n_rxv);
n_rx_packets = n_rxv;
vnet_buffer (bt)->sw_if_index[VLIB_RX] = ad->sw_if_index;
vnet_buffer (bt)->sw_if_index[VLIB_TX] = ~0;
/* receive burst of packets from DPDK PMD */
if (PREDICT_FALSE (ad->per_interface_next_index != ~0))
{
known_next = 1;
next_index = ad->per_interface_next_index;
}
/* as all packets belong to thr same interface feature arc lookup
can be don once and result stored */
if (PREDICT_FALSE (vnet_device_input_have_features (ad->sw_if_index)))
{
vnet_feature_start_device_input_x1 (ad->sw_if_index, &next_index, bt);
known_next = 1;
}
if (known_next)
{
clib_memset_u16 (nexts, next_index, n_rxv);
n_rx_bytes = avf_process_rx_burst (vm, node, bt, ptd->rx_vector, bufs,
nexts, n_rxv, maybe_error, 1);
vnet_buffer (bt)->feature_arc_index = 0;
bt->current_config_index = 0;
}
else
n_rx_bytes = avf_process_rx_burst (vm, node, bt, ptd->rx_vector, bufs,
nexts, n_rxv, maybe_error, 0);
/* packet trace if enabled */
if (PREDICT_FALSE ((n_trace = vlib_get_trace_count (vm, node))))
{
u32 n_left = n_rx_packets;
bi = buffer_indices;
next = nexts;
while (n_trace && n_left)
{
vlib_buffer_t *b;
avf_input_trace_t *tr;
b = vlib_get_buffer (vm, bi[0]);
vlib_trace_buffer (vm, node, next[0], b, /* follow_chain */ 0);
tr = vlib_add_trace (vm, node, b, sizeof (*tr));
tr->next_index = next[0];
tr->hw_if_index = ad->hw_if_index;
clib_memcpy (&tr->rxve, rxve, sizeof (avf_rx_vector_entry_t));
/* next */
n_trace--;
n_left--;
bi++;
next++;
}
vlib_set_trace_count (vm, node, n_trace);
}
vlib_buffer_enqueue_to_next (vm, node, buffer_indices, nexts, n_rx_packets);
vlib_increment_combined_counter (vnm->interface_main.combined_sw_if_counters
+ VNET_INTERFACE_COUNTER_RX, thr_idx,
ad->hw_if_index, n_rx_packets, n_rx_bytes);
done:
return n_rx_packets;
}
VLIB_NODE_FN (avf_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
u32 n_rx = 0;
avf_main_t *am = &avf_main;
vnet_device_input_runtime_t *rt = (void *) node->runtime_data;
vnet_device_and_queue_t *dq;
foreach_device_and_queue (dq, rt->devices_and_queues)
{
avf_device_t *ad;
ad = vec_elt_at_index (am->devices, dq->dev_instance);
if ((ad->flags & AVF_DEVICE_F_ADMIN_UP) == 0)
continue;
n_rx += avf_device_input_inline (vm, node, frame, ad, dq->queue_id);
}
return n_rx;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (avf_input_node) = {
.name = "avf-input",
.sibling_of = "device-input",
.format_trace = format_avf_input_trace,
.type = VLIB_NODE_TYPE_INPUT,
.state = VLIB_NODE_STATE_DISABLED,
.n_errors = AVF_INPUT_N_ERROR,
.error_strings = avf_input_error_strings,
};
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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