--- /dev/null
+/*-
+ * BSD LICENSE
+ *
+ * Copyright (c) 2016-2017 Solarflare Communications Inc.
+ * All rights reserved.
+ *
+ * This software was jointly developed between OKTET Labs (under contract
+ * for Solarflare) and Solarflare Communications, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * 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 <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_mtophys(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_virt2phy((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, 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;
+}
Code Review / deb_dpdk.git / blobdiff