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/* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2016-2018 Solarflare Communications Inc.
* All rights reserved.
*
* This software was jointly developed between OKTET Labs (under contract
* for Solarflare) and Solarflare Communications, Inc.
*/
#include <rte_ip.h>
#include <rte_tcp.h>
#include "sfc.h"
#include "sfc_debug.h"
#include "sfc_tx.h"
#include "sfc_ev.h"
/** Standard TSO header length */
#define SFC_TSOH_STD_LEN 256
/** The number of TSO option descriptors that precede the packet descriptors */
#define SFC_TSO_OPDESCS_IDX_SHIFT 2
int
sfc_efx_tso_alloc_tsoh_objs(struct sfc_efx_tx_sw_desc *sw_ring,
unsigned int txq_entries, unsigned int socket_id)
{
unsigned int i;
for (i = 0; i < txq_entries; ++i) {
sw_ring[i].tsoh = rte_malloc_socket("sfc-efx-txq-tsoh-obj",
SFC_TSOH_STD_LEN,
RTE_CACHE_LINE_SIZE,
socket_id);
if (sw_ring[i].tsoh == NULL)
goto fail_alloc_tsoh_objs;
}
return 0;
fail_alloc_tsoh_objs:
while (i > 0)
rte_free(sw_ring[--i].tsoh);
return ENOMEM;
}
void
sfc_efx_tso_free_tsoh_objs(struct sfc_efx_tx_sw_desc *sw_ring,
unsigned int txq_entries)
{
unsigned int i;
for (i = 0; i < txq_entries; ++i) {
rte_free(sw_ring[i].tsoh);
sw_ring[i].tsoh = NULL;
}
}
static void
sfc_efx_tso_prepare_header(struct sfc_efx_txq *txq, struct rte_mbuf **in_seg,
size_t *in_off, unsigned int idx, size_t bytes_left)
{
struct rte_mbuf *m = *in_seg;
size_t bytes_to_copy = 0;
uint8_t *tsoh = txq->sw_ring[idx & txq->ptr_mask].tsoh;
do {
bytes_to_copy = MIN(bytes_left, m->data_len);
rte_memcpy(tsoh, rte_pktmbuf_mtod(m, uint8_t *),
bytes_to_copy);
bytes_left -= bytes_to_copy;
tsoh += bytes_to_copy;
if (bytes_left > 0) {
m = m->next;
SFC_ASSERT(m != NULL);
}
} while (bytes_left > 0);
if (bytes_to_copy == m->data_len) {
*in_seg = m->next;
*in_off = 0;
} else {
*in_seg = m;
*in_off = bytes_to_copy;
}
}
int
sfc_efx_tso_do(struct sfc_efx_txq *txq, unsigned int idx,
struct rte_mbuf **in_seg, size_t *in_off, efx_desc_t **pend,
unsigned int *pkt_descs, size_t *pkt_len)
{
uint8_t *tsoh;
const struct tcp_hdr *th;
efsys_dma_addr_t header_paddr;
uint16_t packet_id;
uint32_t sent_seq;
struct rte_mbuf *m = *in_seg;
size_t nh_off = m->l2_len; /* IP header offset */
size_t tcph_off = m->l2_len + m->l3_len; /* TCP header offset */
size_t header_len = m->l2_len + m->l3_len + m->l4_len;
const efx_nic_cfg_t *encp = efx_nic_cfg_get(txq->evq->sa->nic);
idx += SFC_TSO_OPDESCS_IDX_SHIFT;
/* Packets which have too big headers should be discarded */
if (unlikely(header_len > SFC_TSOH_STD_LEN))
return EMSGSIZE;
/*
* The TCP header must start at most 208 bytes into the frame.
* If it starts later than this then the NIC won't realise
* it's a TCP packet and TSO edits won't be applied
*/
if (unlikely(tcph_off > encp->enc_tx_tso_tcp_header_offset_limit))
return EMSGSIZE;
header_paddr = rte_pktmbuf_iova(m);
/*
* Sometimes headers may be split across multiple mbufs. In such cases
* we need to glue those pieces and store them in some temporary place.
* Also, packet headers must be contiguous in memory, so that
* they can be referred to with a single DMA descriptor. EF10 has no
* limitations on address boundaries crossing by DMA descriptor data.
*/
if (m->data_len < header_len) {
sfc_efx_tso_prepare_header(txq, in_seg, in_off, idx,
header_len);
tsoh = txq->sw_ring[idx & txq->ptr_mask].tsoh;
header_paddr = rte_malloc_virt2iova((void *)tsoh);
} else {
if (m->data_len == header_len) {
*in_off = 0;
*in_seg = m->next;
} else {
*in_off = header_len;
}
tsoh = rte_pktmbuf_mtod(m, uint8_t *);
}
/* Handle IP header */
if (m->ol_flags & PKT_TX_IPV4) {
const struct ipv4_hdr *iphe4;
iphe4 = (const struct ipv4_hdr *)(tsoh + nh_off);
rte_memcpy(&packet_id, &iphe4->packet_id, sizeof(uint16_t));
packet_id = rte_be_to_cpu_16(packet_id);
} else if (m->ol_flags & PKT_TX_IPV6) {
packet_id = 0;
} else {
return EINVAL;
}
/* Handle TCP header */
th = (const struct tcp_hdr *)(tsoh + tcph_off);
rte_memcpy(&sent_seq, &th->sent_seq, sizeof(uint32_t));
sent_seq = rte_be_to_cpu_32(sent_seq);
efx_tx_qdesc_tso2_create(txq->common, packet_id, 0, sent_seq,
m->tso_segsz,
*pend, EFX_TX_FATSOV2_OPT_NDESCS);
*pend += EFX_TX_FATSOV2_OPT_NDESCS;
*pkt_descs += EFX_TX_FATSOV2_OPT_NDESCS;
efx_tx_qdesc_dma_create(txq->common, header_paddr, header_len,
B_FALSE, (*pend)++);
(*pkt_descs)++;
*pkt_len -= header_len;
return 0;
}
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