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numam-dpdk/lib/librte_mbuf/rte_mbuf.c
Jerin Jacob cb327a7802 mbuf: reduce pktmbuf init cycles 
There is no need for initializing the complete
packet buffer with zero as the packet data area will be
overwritten by the NIC Rx HW anyway.

The testpmd configures the packet mempool
with around 180k buffers with
2176B size. In existing scheme, the init routine
needs to memset around ~370MB vs the proposed scheme
requires only around ~22MB on 128B cache aligned system.

Useful in running DPDK in HW simulators/emulators,
where millions of cycles have an impact on boot time.

Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Acked-by: Olivier Matz <olivier.matz@6wind.com>
2017-07-01 12:14:58 +02:00

469 lines
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/*-
* BSD LICENSE
*
* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
* Copyright 2014 6WIND S.A.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdarg.h>
#include <inttypes.h>
#include <errno.h>
#include <ctype.h>
#include <sys/queue.h>
#include <rte_debug.h>
#include <rte_common.h>
#include <rte_log.h>
#include <rte_memory.h>
#include <rte_memzone.h>
#include <rte_launch.h>
#include <rte_eal.h>
#include <rte_per_lcore.h>
#include <rte_lcore.h>
#include <rte_atomic.h>
#include <rte_branch_prediction.h>
#include <rte_mempool.h>
#include <rte_mbuf.h>
#include <rte_string_fns.h>
#include <rte_hexdump.h>
#include <rte_errno.h>
#include <rte_memcpy.h>
/*
* ctrlmbuf constructor, given as a callback function to
* rte_mempool_obj_iter() or rte_mempool_create()
*/
void
rte_ctrlmbuf_init(struct rte_mempool *mp,
__attribute__((unused)) void *opaque_arg,
void *_m,
__attribute__((unused)) unsigned i)
{
struct rte_mbuf *m = _m;
rte_pktmbuf_init(mp, opaque_arg, _m, i);
m->ol_flags |= CTRL_MBUF_FLAG;
}
/*
* pktmbuf pool constructor, given as a callback function to
* rte_mempool_create(), or called directly if using
* rte_mempool_create_empty()/rte_mempool_populate()
*/
void
rte_pktmbuf_pool_init(struct rte_mempool *mp, void *opaque_arg)
{
struct rte_pktmbuf_pool_private *user_mbp_priv, *mbp_priv;
struct rte_pktmbuf_pool_private default_mbp_priv;
uint16_t roomsz;
RTE_ASSERT(mp->elt_size >= sizeof(struct rte_mbuf));
/* if no structure is provided, assume no mbuf private area */
user_mbp_priv = opaque_arg;
if (user_mbp_priv == NULL) {
default_mbp_priv.mbuf_priv_size = 0;
if (mp->elt_size > sizeof(struct rte_mbuf))
roomsz = mp->elt_size - sizeof(struct rte_mbuf);
else
roomsz = 0;
default_mbp_priv.mbuf_data_room_size = roomsz;
user_mbp_priv = &default_mbp_priv;
}
RTE_ASSERT(mp->elt_size >= sizeof(struct rte_mbuf) +
user_mbp_priv->mbuf_data_room_size +
user_mbp_priv->mbuf_priv_size);
mbp_priv = rte_mempool_get_priv(mp);
memcpy(mbp_priv, user_mbp_priv, sizeof(*mbp_priv));
}
/*
* pktmbuf constructor, given as a callback function to
* rte_mempool_obj_iter() or rte_mempool_create().
* Set the fields of a packet mbuf to their default values.
*/
void
rte_pktmbuf_init(struct rte_mempool *mp,
__attribute__((unused)) void *opaque_arg,
void *_m,
__attribute__((unused)) unsigned i)
{
struct rte_mbuf *m = _m;
uint32_t mbuf_size, buf_len, priv_size;
priv_size = rte_pktmbuf_priv_size(mp);
mbuf_size = sizeof(struct rte_mbuf) + priv_size;
buf_len = rte_pktmbuf_data_room_size(mp);
RTE_ASSERT(RTE_ALIGN(priv_size, RTE_MBUF_PRIV_ALIGN) == priv_size);
RTE_ASSERT(mp->elt_size >= mbuf_size);
RTE_ASSERT(buf_len <= UINT16_MAX);
memset(m, 0, mbuf_size);
/* start of buffer is after mbuf structure and priv data */
m->priv_size = priv_size;
m->buf_addr = (char *)m + mbuf_size;
m->buf_physaddr = rte_mempool_virt2phy(mp, m) + mbuf_size;
m->buf_len = (uint16_t)buf_len;
/* keep some headroom between start of buffer and data */
m->data_off = RTE_MIN(RTE_PKTMBUF_HEADROOM, (uint16_t)m->buf_len);
/* init some constant fields */
m->pool = mp;
m->nb_segs = 1;
m->port = 0xff;
rte_mbuf_refcnt_set(m, 1);
m->next = NULL;
}
/* helper to create a mbuf pool */
struct rte_mempool *
rte_pktmbuf_pool_create(const char *name, unsigned n,
unsigned cache_size, uint16_t priv_size, uint16_t data_room_size,
int socket_id)
{
struct rte_mempool *mp;
struct rte_pktmbuf_pool_private mbp_priv;
unsigned elt_size;
int ret;
if (RTE_ALIGN(priv_size, RTE_MBUF_PRIV_ALIGN) != priv_size) {
RTE_LOG(ERR, MBUF, "mbuf priv_size=%u is not aligned\n",
priv_size);
rte_errno = EINVAL;
return NULL;
}
elt_size = sizeof(struct rte_mbuf) + (unsigned)priv_size +
(unsigned)data_room_size;
mbp_priv.mbuf_data_room_size = data_room_size;
mbp_priv.mbuf_priv_size = priv_size;
mp = rte_mempool_create_empty(name, n, elt_size, cache_size,
sizeof(struct rte_pktmbuf_pool_private), socket_id, 0);
if (mp == NULL)
return NULL;
ret = rte_mempool_set_ops_byname(mp,
RTE_MBUF_DEFAULT_MEMPOOL_OPS, NULL);
if (ret != 0) {
RTE_LOG(ERR, MBUF, "error setting mempool handler\n");
rte_mempool_free(mp);
rte_errno = -ret;
return NULL;
}
rte_pktmbuf_pool_init(mp, &mbp_priv);
ret = rte_mempool_populate_default(mp);
if (ret < 0) {
rte_mempool_free(mp);
rte_errno = -ret;
return NULL;
}
rte_mempool_obj_iter(mp, rte_pktmbuf_init, NULL);
return mp;
}
/* do some sanity checks on a mbuf: panic if it fails */
void
rte_mbuf_sanity_check(const struct rte_mbuf *m, int is_header)
{
const struct rte_mbuf *m_seg;
unsigned nb_segs;
if (m == NULL)
rte_panic("mbuf is NULL\n");
/* generic checks */
if (m->pool == NULL)
rte_panic("bad mbuf pool\n");
if (m->buf_physaddr == 0)
rte_panic("bad phys addr\n");
if (m->buf_addr == NULL)
rte_panic("bad virt addr\n");
uint16_t cnt = rte_mbuf_refcnt_read(m);
if ((cnt == 0) || (cnt == UINT16_MAX))
rte_panic("bad ref cnt\n");
/* nothing to check for sub-segments */
if (is_header == 0)
return;
nb_segs = m->nb_segs;
m_seg = m;
while (m_seg && nb_segs != 0) {
m_seg = m_seg->next;
nb_segs--;
}
if (nb_segs != 0)
rte_panic("bad nb_segs\n");
}
/* dump a mbuf on console */
void
rte_pktmbuf_dump(FILE *f, const struct rte_mbuf *m, unsigned dump_len)
{
unsigned int len;
unsigned nb_segs;
__rte_mbuf_sanity_check(m, 1);
fprintf(f, "dump mbuf at %p, phys=%"PRIx64", buf_len=%u\n",
m, (uint64_t)m->buf_physaddr, (unsigned)m->buf_len);
fprintf(f, " pkt_len=%"PRIu32", ol_flags=%"PRIx64", nb_segs=%u, "
"in_port=%u\n", m->pkt_len, m->ol_flags,
(unsigned)m->nb_segs, (unsigned)m->port);
nb_segs = m->nb_segs;
while (m && nb_segs != 0) {
__rte_mbuf_sanity_check(m, 0);
fprintf(f, " segment at %p, data=%p, data_len=%u\n",
m, rte_pktmbuf_mtod(m, void *), (unsigned)m->data_len);
len = dump_len;
if (len > m->data_len)
len = m->data_len;
if (len != 0)
rte_hexdump(f, NULL, rte_pktmbuf_mtod(m, void *), len);
dump_len -= len;
m = m->next;
nb_segs --;
}
}
/* read len data bytes in a mbuf at specified offset (internal) */
const void *__rte_pktmbuf_read(const struct rte_mbuf *m, uint32_t off,
uint32_t len, void *buf)
{
const struct rte_mbuf *seg = m;
uint32_t buf_off = 0, copy_len;
if (off + len > rte_pktmbuf_pkt_len(m))
return NULL;
while (off >= rte_pktmbuf_data_len(seg)) {
off -= rte_pktmbuf_data_len(seg);
seg = seg->next;
}
if (off + len <= rte_pktmbuf_data_len(seg))
return rte_pktmbuf_mtod_offset(seg, char *, off);
/* rare case: header is split among several segments */
while (len > 0) {
copy_len = rte_pktmbuf_data_len(seg) - off;
if (copy_len > len)
copy_len = len;
rte_memcpy((char *)buf + buf_off,
rte_pktmbuf_mtod_offset(seg, char *, off), copy_len);
off = 0;
buf_off += copy_len;
len -= copy_len;
seg = seg->next;
}
return buf;
}
/*
* Get the name of a RX offload flag. Must be kept synchronized with flag
* definitions in rte_mbuf.h.
*/
const char *rte_get_rx_ol_flag_name(uint64_t mask)
{
switch (mask) {
case PKT_RX_VLAN_PKT: return "PKT_RX_VLAN_PKT";
case PKT_RX_RSS_HASH: return "PKT_RX_RSS_HASH";
case PKT_RX_FDIR: return "PKT_RX_FDIR";
case PKT_RX_L4_CKSUM_BAD: return "PKT_RX_L4_CKSUM_BAD";
case PKT_RX_L4_CKSUM_GOOD: return "PKT_RX_L4_CKSUM_GOOD";
case PKT_RX_L4_CKSUM_NONE: return "PKT_RX_L4_CKSUM_NONE";
case PKT_RX_IP_CKSUM_BAD: return "PKT_RX_IP_CKSUM_BAD";
case PKT_RX_IP_CKSUM_GOOD: return "PKT_RX_IP_CKSUM_GOOD";
case PKT_RX_IP_CKSUM_NONE: return "PKT_RX_IP_CKSUM_NONE";
case PKT_RX_EIP_CKSUM_BAD: return "PKT_RX_EIP_CKSUM_BAD";
case PKT_RX_VLAN_STRIPPED: return "PKT_RX_VLAN_STRIPPED";
case PKT_RX_IEEE1588_PTP: return "PKT_RX_IEEE1588_PTP";
case PKT_RX_IEEE1588_TMST: return "PKT_RX_IEEE1588_TMST";
case PKT_RX_QINQ_STRIPPED: return "PKT_RX_QINQ_STRIPPED";
case PKT_RX_LRO: return "PKT_RX_LRO";
case PKT_RX_TIMESTAMP: return "PKT_RX_TIMESTAMP";
default: return NULL;
}
}
struct flag_mask {
uint64_t flag;
uint64_t mask;
const char *default_name;
};
/* write the list of rx ol flags in buffer buf */
int
rte_get_rx_ol_flag_list(uint64_t mask, char *buf, size_t buflen)
{
const struct flag_mask rx_flags[] = {
{ PKT_RX_VLAN_PKT, PKT_RX_VLAN_PKT, NULL },
{ PKT_RX_RSS_HASH, PKT_RX_RSS_HASH, NULL },
{ PKT_RX_FDIR, PKT_RX_FDIR, NULL },
{ PKT_RX_L4_CKSUM_BAD, PKT_RX_L4_CKSUM_MASK, NULL },
{ PKT_RX_L4_CKSUM_GOOD, PKT_RX_L4_CKSUM_MASK, NULL },
{ PKT_RX_L4_CKSUM_NONE, PKT_RX_L4_CKSUM_MASK, NULL },
{ PKT_RX_L4_CKSUM_UNKNOWN, PKT_RX_L4_CKSUM_MASK,
"PKT_RX_L4_CKSUM_UNKNOWN" },
{ PKT_RX_IP_CKSUM_BAD, PKT_RX_IP_CKSUM_MASK, NULL },
{ PKT_RX_IP_CKSUM_GOOD, PKT_RX_IP_CKSUM_MASK, NULL },
{ PKT_RX_IP_CKSUM_NONE, PKT_RX_IP_CKSUM_MASK, NULL },
{ PKT_RX_IP_CKSUM_UNKNOWN, PKT_RX_IP_CKSUM_MASK,
"PKT_RX_IP_CKSUM_UNKNOWN" },
{ PKT_RX_EIP_CKSUM_BAD, PKT_RX_EIP_CKSUM_BAD, NULL },
{ PKT_RX_VLAN_STRIPPED, PKT_RX_VLAN_STRIPPED, NULL },
{ PKT_RX_IEEE1588_PTP, PKT_RX_IEEE1588_PTP, NULL },
{ PKT_RX_IEEE1588_TMST, PKT_RX_IEEE1588_TMST, NULL },
{ PKT_RX_QINQ_STRIPPED, PKT_RX_QINQ_STRIPPED, NULL },
{ PKT_RX_LRO, PKT_RX_LRO, NULL },
{ PKT_RX_TIMESTAMP, PKT_RX_TIMESTAMP, NULL },
};
const char *name;
unsigned int i;
int ret;
if (buflen == 0)
return -1;
buf[0] = '\0';
for (i = 0; i < RTE_DIM(rx_flags); i++) {
if ((mask & rx_flags[i].mask) != rx_flags[i].flag)
continue;
name = rte_get_rx_ol_flag_name(rx_flags[i].flag);
if (name == NULL)
name = rx_flags[i].default_name;
ret = snprintf(buf, buflen, "%s ", name);
if (ret < 0)
return -1;
if ((size_t)ret >= buflen)
return -1;
buf += ret;
buflen -= ret;
}
return 0;
}
/*
* Get the name of a TX offload flag. Must be kept synchronized with flag
* definitions in rte_mbuf.h.
*/
const char *rte_get_tx_ol_flag_name(uint64_t mask)
{
switch (mask) {
case PKT_TX_VLAN_PKT: return "PKT_TX_VLAN_PKT";
case PKT_TX_IP_CKSUM: return "PKT_TX_IP_CKSUM";
case PKT_TX_TCP_CKSUM: return "PKT_TX_TCP_CKSUM";
case PKT_TX_SCTP_CKSUM: return "PKT_TX_SCTP_CKSUM";
case PKT_TX_UDP_CKSUM: return "PKT_TX_UDP_CKSUM";
case PKT_TX_IEEE1588_TMST: return "PKT_TX_IEEE1588_TMST";
case PKT_TX_TCP_SEG: return "PKT_TX_TCP_SEG";
case PKT_TX_IPV4: return "PKT_TX_IPV4";
case PKT_TX_IPV6: return "PKT_TX_IPV6";
case PKT_TX_OUTER_IP_CKSUM: return "PKT_TX_OUTER_IP_CKSUM";
case PKT_TX_OUTER_IPV4: return "PKT_TX_OUTER_IPV4";
case PKT_TX_OUTER_IPV6: return "PKT_TX_OUTER_IPV6";
case PKT_TX_TUNNEL_VXLAN: return "PKT_TX_TUNNEL_VXLAN";
case PKT_TX_TUNNEL_GRE: return "PKT_TX_TUNNEL_GRE";
case PKT_TX_TUNNEL_IPIP: return "PKT_TX_TUNNEL_IPIP";
case PKT_TX_TUNNEL_GENEVE: return "PKT_TX_TUNNEL_GENEVE";
case PKT_TX_MACSEC: return "PKT_TX_MACSEC";
default: return NULL;
}
}
/* write the list of tx ol flags in buffer buf */
int
rte_get_tx_ol_flag_list(uint64_t mask, char *buf, size_t buflen)
{
const struct flag_mask tx_flags[] = {
{ PKT_TX_VLAN_PKT, PKT_TX_VLAN_PKT, NULL },
{ PKT_TX_IP_CKSUM, PKT_TX_IP_CKSUM, NULL },
{ PKT_TX_TCP_CKSUM, PKT_TX_L4_MASK, NULL },
{ PKT_TX_SCTP_CKSUM, PKT_TX_L4_MASK, NULL },
{ PKT_TX_UDP_CKSUM, PKT_TX_L4_MASK, NULL },
{ PKT_TX_L4_NO_CKSUM, PKT_TX_L4_MASK, "PKT_TX_L4_NO_CKSUM" },
{ PKT_TX_IEEE1588_TMST, PKT_TX_IEEE1588_TMST, NULL },
{ PKT_TX_TCP_SEG, PKT_TX_TCP_SEG, NULL },
{ PKT_TX_IPV4, PKT_TX_IPV4, NULL },
{ PKT_TX_IPV6, PKT_TX_IPV6, NULL },
{ PKT_TX_OUTER_IP_CKSUM, PKT_TX_OUTER_IP_CKSUM, NULL },
{ PKT_TX_OUTER_IPV4, PKT_TX_OUTER_IPV4, NULL },
{ PKT_TX_OUTER_IPV6, PKT_TX_OUTER_IPV6, NULL },
{ PKT_TX_TUNNEL_VXLAN, PKT_TX_TUNNEL_MASK,
"PKT_TX_TUNNEL_NONE" },
{ PKT_TX_TUNNEL_GRE, PKT_TX_TUNNEL_MASK,
"PKT_TX_TUNNEL_NONE" },
{ PKT_TX_TUNNEL_IPIP, PKT_TX_TUNNEL_MASK,
"PKT_TX_TUNNEL_NONE" },
{ PKT_TX_TUNNEL_GENEVE, PKT_TX_TUNNEL_MASK,
"PKT_TX_TUNNEL_NONE" },
{ PKT_TX_MACSEC, PKT_TX_MACSEC, NULL },
};
const char *name;
unsigned int i;
int ret;
if (buflen == 0)
return -1;
buf[0] = '\0';
for (i = 0; i < RTE_DIM(tx_flags); i++) {
if ((mask & tx_flags[i].mask) != tx_flags[i].flag)
continue;
name = rte_get_tx_ol_flag_name(tx_flags[i].flag);
if (name == NULL)
name = tx_flags[i].default_name;
ret = snprintf(buf, buflen, "%s ", name);
if (ret < 0)
return -1;
if ((size_t)ret >= buflen)
return -1;
buf += ret;
buflen -= ret;
}
return 0;
}
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