numam-dpdk/lib/librte_ip_frag/rte_ipv4_reassembly.c

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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2014 Intel Corporation
*/
#include <stddef.h>
#include <rte_debug.h>
#include "ip_frag_common.h"
/*
* Reassemble fragments into one packet.
*/
struct rte_mbuf *
ipv4_frag_reassemble(struct ip_frag_pkt *fp)
{
struct ipv4_hdr *ip_hdr;
struct rte_mbuf *m, *prev;
uint32_t i, n, ofs, first_len;
uint32_t curr_idx = 0;
first_len = fp->frags[IP_FIRST_FRAG_IDX].len;
n = fp->last_idx - 1;
/*start from the last fragment. */
m = fp->frags[IP_LAST_FRAG_IDX].mb;
ofs = fp->frags[IP_LAST_FRAG_IDX].ofs;
curr_idx = IP_LAST_FRAG_IDX;
while (ofs != first_len) {
prev = m;
for (i = n; i != IP_FIRST_FRAG_IDX && ofs != first_len; i--) {
/* previous fragment found. */
if(fp->frags[i].ofs + fp->frags[i].len == ofs) {
/* adjust start of the last fragment data. */
rte_pktmbuf_adj(m, (uint16_t)(m->l2_len + m->l3_len));
rte_pktmbuf_chain(fp->frags[i].mb, m);
/* this mbuf should not be accessed directly */
fp->frags[curr_idx].mb = NULL;
curr_idx = i;
/* update our last fragment and offset. */
m = fp->frags[i].mb;
ofs = fp->frags[i].ofs;
}
}
/* error - hole in the packet. */
if (m == prev) {
return NULL;
}
}
/* chain with the first fragment. */
rte_pktmbuf_adj(m, (uint16_t)(m->l2_len + m->l3_len));
rte_pktmbuf_chain(fp->frags[IP_FIRST_FRAG_IDX].mb, m);
fp->frags[curr_idx].mb = NULL;
m = fp->frags[IP_FIRST_FRAG_IDX].mb;
fp->frags[IP_FIRST_FRAG_IDX].mb = NULL;
/* update mbuf fields for reassembled packet. */
m->ol_flags |= PKT_TX_IP_CKSUM;
/* update ipv4 header for the reassembled packet */
ip_hdr = rte_pktmbuf_mtod_offset(m, struct ipv4_hdr *, m->l2_len);
ip_hdr->total_length = rte_cpu_to_be_16((uint16_t)(fp->total_size +
mbuf: flatten struct vlan_macip The vlan_macip structure combined a vlan tag id with l2 and l3 headers lengths for tracking offloads. However, this structure was only used as a unit by the e1000 and ixgbe drivers, not generally. This patch removes the structure from the mbuf header and places the fields into the mbuf structure directly at the required point, without any net effect on the structure layout. This allows us to treat the vlan tags and header length fields as separate for future mbuf changes. The drivers which were written to use the combined structure still do so, using a driver-local definition of it. Reduce perf regression caused by splitting vlan_macip field. This is done by providing a single uint16_t value to allow writing/clearing the l2 and l3 lengths together. There is still a small perf hit to the slow path TX due to the reads from vlan_tci and l2/l3 lengths being separated. (<5% in my tests with testpmd with no extra params). Unfortunately, this cannot be eliminated, without restoring the vlan tags and l2/l3 lengths as a combined 32-bit field. This would prevent us from ever looking to move those fields about and is an artificial tie that applies only for performance in igb and ixgbe drivers. Therefore, this patch keeps the vlan_tci field separate from the lengths as the best solution going forward. Signed-off-by: Bruce Richardson <bruce.richardson@intel.com> Acked-by: Olivier Matz <olivier.matz@6wind.com> Acked-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
2014-09-09 14:40:56 +00:00
m->l3_len));
ip_hdr->fragment_offset = (uint16_t)(ip_hdr->fragment_offset &
rte_cpu_to_be_16(IPV4_HDR_DF_FLAG));
ip_hdr->hdr_checksum = 0;
return m;
}
/*
* Process new mbuf with fragment of IPV4 packet.
* Incoming mbuf should have it's l2_len/l3_len fields setuped correclty.
* @param tbl
* Table where to lookup/add the fragmented packet.
* @param mb
* Incoming mbuf with IPV4 fragment.
* @param tms
* Fragment arrival timestamp.
* @param ip_hdr
* Pointer to the IPV4 header inside the fragment.
* @return
* Pointer to mbuf for reassembled packet, or NULL if:
* - an error occurred.
* - not all fragments of the packet are collected yet.
*/
struct rte_mbuf *
rte_ipv4_frag_reassemble_packet(struct rte_ip_frag_tbl *tbl,
struct rte_ip_frag_death_row *dr, struct rte_mbuf *mb, uint64_t tms,
struct ipv4_hdr *ip_hdr)
{
struct ip_frag_pkt *fp;
struct ip_frag_key key;
const unaligned_uint64_t *psd;
uint16_t ip_len;
uint16_t flag_offset, ip_ofs, ip_flag;
flag_offset = rte_be_to_cpu_16(ip_hdr->fragment_offset);
ip_ofs = (uint16_t)(flag_offset & IPV4_HDR_OFFSET_MASK);
ip_flag = (uint16_t)(flag_offset & IPV4_HDR_MF_FLAG);
psd = (unaligned_uint64_t *)&ip_hdr->src_addr;
/* use first 8 bytes only */
key.src_dst[0] = psd[0];
key.id = ip_hdr->packet_id;
key.key_len = IPV4_KEYLEN;
ip_ofs *= IPV4_HDR_OFFSET_UNITS;
ip_len = (uint16_t)(rte_be_to_cpu_16(ip_hdr->total_length) -
mbuf: flatten struct vlan_macip The vlan_macip structure combined a vlan tag id with l2 and l3 headers lengths for tracking offloads. However, this structure was only used as a unit by the e1000 and ixgbe drivers, not generally. This patch removes the structure from the mbuf header and places the fields into the mbuf structure directly at the required point, without any net effect on the structure layout. This allows us to treat the vlan tags and header length fields as separate for future mbuf changes. The drivers which were written to use the combined structure still do so, using a driver-local definition of it. Reduce perf regression caused by splitting vlan_macip field. This is done by providing a single uint16_t value to allow writing/clearing the l2 and l3 lengths together. There is still a small perf hit to the slow path TX due to the reads from vlan_tci and l2/l3 lengths being separated. (<5% in my tests with testpmd with no extra params). Unfortunately, this cannot be eliminated, without restoring the vlan tags and l2/l3 lengths as a combined 32-bit field. This would prevent us from ever looking to move those fields about and is an artificial tie that applies only for performance in igb and ixgbe drivers. Therefore, this patch keeps the vlan_tci field separate from the lengths as the best solution going forward. Signed-off-by: Bruce Richardson <bruce.richardson@intel.com> Acked-by: Olivier Matz <olivier.matz@6wind.com> Acked-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
2014-09-09 14:40:56 +00:00
mb->l3_len);
IP_FRAG_LOG(DEBUG, "%s:%d:\n"
"mbuf: %p, tms: %" PRIu64
", key: <%" PRIx64 ", %#x>, ofs: %u, len: %u, flags: %#x\n"
"tbl: %p, max_cycles: %" PRIu64 ", entry_mask: %#x, "
"max_entries: %u, use_entries: %u\n\n",
__func__, __LINE__,
mb, tms, key.src_dst[0], key.id, ip_ofs, ip_len, ip_flag,
tbl, tbl->max_cycles, tbl->entry_mask, tbl->max_entries,
tbl->use_entries);
/* try to find/add entry into the fragment's table. */
if ((fp = ip_frag_find(tbl, dr, &key, tms)) == NULL) {
IP_FRAG_MBUF2DR(dr, mb);
return NULL;
}
IP_FRAG_LOG(DEBUG, "%s:%d:\n"
"tbl: %p, max_entries: %u, use_entries: %u\n"
"ipv4_frag_pkt: %p, key: <%" PRIx64 ", %#x>, start: %" PRIu64
", total_size: %u, frag_size: %u, last_idx: %u\n\n",
__func__, __LINE__,
tbl, tbl->max_entries, tbl->use_entries,
fp, fp->key.src_dst[0], fp->key.id, fp->start,
fp->total_size, fp->frag_size, fp->last_idx);
/* process the fragmented packet. */
mb = ip_frag_process(fp, dr, mb, ip_ofs, ip_len, ip_flag);
ip_frag_inuse(tbl, fp);
IP_FRAG_LOG(DEBUG, "%s:%d:\n"
"mbuf: %p\n"
"tbl: %p, max_entries: %u, use_entries: %u\n"
"ipv4_frag_pkt: %p, key: <%" PRIx64 ", %#x>, start: %" PRIu64
", total_size: %u, frag_size: %u, last_idx: %u\n\n",
__func__, __LINE__, mb,
tbl, tbl->max_entries, tbl->use_entries,
fp, fp->key.src_dst[0], fp->key.id, fp->start,
fp->total_size, fp->frag_size, fp->last_idx);
return mb;
}