unsigned int evq_phase_bit_shift;
volatile efx_qword_t *evq_hw_ring;
+ uint16_t tso_tcp_header_offset_limit;
+ uint16_t tso_max_nb_header_descs;
+ uint16_t tso_max_header_len;
+ uint16_t tso_max_nb_payload_descs;
+ uint32_t tso_max_payload_len;
+ uint32_t tso_max_nb_outgoing_frames;
+
/* Datapath transmit queue anchor */
struct sfc_dp_txq dp;
};
return container_of(dp_txq, struct sfc_ef100_txq, dp);
}
+static int
+sfc_ef100_tx_prepare_pkt_tso(struct sfc_ef100_txq * const txq,
+ struct rte_mbuf *m)
+{
+ size_t header_len = m->l2_len + m->l3_len + m->l4_len;
+ size_t payload_len = m->pkt_len - header_len;
+ unsigned long mss_conformant_max_payload_len;
+ unsigned int nb_payload_descs;
+
+ mss_conformant_max_payload_len =
+ m->tso_segsz * txq->tso_max_nb_outgoing_frames;
+
+ /*
+ * Don't really want to know exact number of payload segments.
+ * Just use total number of segments as upper limit. Practically
+ * maximum number of payload segments is significantly bigger
+ * than maximum number header segments, so we can neglect header
+ * segments excluded total number of segments to estimate number
+ * of payload segments required.
+ */
+ nb_payload_descs = m->nb_segs;
+
+ /*
+ * Carry out multiple independent checks using bitwise OR
+ * to avoid unnecessary conditional branching.
+ */
+ if (unlikely((header_len > txq->tso_max_header_len) |
+ (nb_payload_descs > txq->tso_max_nb_payload_descs) |
+ (payload_len > txq->tso_max_payload_len) |
+ (payload_len > mss_conformant_max_payload_len) |
+ (m->pkt_len == header_len)))
+ return EINVAL;
+
+ return 0;
+}
+
static uint16_t
sfc_ef100_tx_prepare_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
uint16_t nb_pkts)
(m->ol_flags & PKT_TX_L4_MASK)) {
calc_phdr_cksum = true;
max_nb_header_segs = 1;
+ } else if (m->ol_flags & PKT_TX_TCP_SEG) {
+ max_nb_header_segs = txq->tso_max_nb_header_descs;
}
ret = sfc_dp_tx_prepare_pkt(m, max_nb_header_segs, 0,
- 0, txq->max_fill_level, 0, 0);
+ txq->tso_tcp_header_offset_limit,
+ txq->max_fill_level, 1, 0);
if (unlikely(ret != 0)) {
rte_errno = ret;
break;
}
- if (m->nb_segs > EFX_MASK32(ESF_GZ_TX_SEND_NUM_SEGS)) {
+ if (m->ol_flags & PKT_TX_TCP_SEG) {
+ ret = sfc_ef100_tx_prepare_pkt_tso(txq, m);
+ if (unlikely(ret != 0)) {
+ rte_errno = ret;
+ break;
+ }
+ } else if (m->nb_segs > EFX_MASK32(ESF_GZ_TX_SEND_NUM_SEGS)) {
rte_errno = EINVAL;
break;
}
ESF_GZ_TX_DESC_TYPE, ESE_GZ_TX_DESC_TYPE_SEG);
}
+static void
+sfc_ef100_tx_qdesc_tso_create(const struct rte_mbuf *m,
+ uint16_t nb_header_descs,
+ uint16_t nb_payload_descs,
+ size_t header_len, size_t payload_len,
+ size_t iph_off, size_t tcph_off,
+ efx_oword_t *tx_desc)
+{
+ efx_oword_t tx_desc_extra_fields;
+ /*
+ * If no tunnel encapsulation is present, then the ED_INNER
+ * fields should be used.
+ */
+ int ed_inner_ip_id = ESE_GZ_TX_DESC_IP4_ID_INC_MOD16;
+
+ EFX_POPULATE_OWORD_7(*tx_desc,
+ ESF_GZ_TX_TSO_MSS, m->tso_segsz,
+ ESF_GZ_TX_TSO_HDR_NUM_SEGS, nb_header_descs,
+ ESF_GZ_TX_TSO_PAYLOAD_NUM_SEGS, nb_payload_descs,
+ ESF_GZ_TX_TSO_ED_INNER_IP4_ID, ed_inner_ip_id,
+ ESF_GZ_TX_TSO_ED_INNER_IP_LEN, 1,
+ ESF_GZ_TX_TSO_HDR_LEN_W, header_len >> 1,
+ ESF_GZ_TX_TSO_PAYLOAD_LEN, payload_len);
+
+ EFX_POPULATE_OWORD_5(tx_desc_extra_fields,
+ /*
+ * Inner offsets are required for inner IPv4 ID
+ * and IP length edits.
+ */
+ ESF_GZ_TX_TSO_INNER_L3_OFF_W, iph_off >> 1,
+ ESF_GZ_TX_TSO_INNER_L4_OFF_W, tcph_off >> 1,
+ /*
+ * Use outer full checksum offloads which do
+ * not require any extra information.
+ */
+ ESF_GZ_TX_TSO_CSO_OUTER_L3, 1,
+ ESF_GZ_TX_TSO_CSO_OUTER_L4, 1,
+ ESF_GZ_TX_DESC_TYPE, ESE_GZ_TX_DESC_TYPE_TSO);
+
+ EFX_OR_OWORD(*tx_desc, tx_desc_extra_fields);
+}
+
static inline void
sfc_ef100_tx_qpush(struct sfc_ef100_txq *txq, unsigned int added)
{
static unsigned int
sfc_ef100_tx_pkt_descs_max(const struct rte_mbuf *m)
{
+ unsigned int extra_descs = 0;
+
/** Maximum length of an mbuf segment data */
#define SFC_MBUF_SEG_LEN_MAX UINT16_MAX
RTE_BUILD_BUG_ON(sizeof(m->data_len) != 2);
+ if (m->ol_flags & PKT_TX_TCP_SEG) {
+ /* Tx TSO descriptor */
+ extra_descs++;
+ /*
+ * Extra Tx segment descriptor may be required if header
+ * ends in the middle of segment.
+ */
+ extra_descs++;
+ } else {
+ /*
+ * mbuf segment cannot be bigger than maximum segment length
+ * and maximum packet length since TSO is not supported yet.
+ * Make sure that the first segment does not need fragmentation
+ * (split into many Tx descriptors).
+ */
+ RTE_BUILD_BUG_ON(SFC_EF100_TX_SEND_DESC_LEN_MAX <
+ RTE_MIN((unsigned int)EFX_MAC_PDU_MAX,
+ SFC_MBUF_SEG_LEN_MAX));
+ }
+
/*
- * mbuf segment cannot be bigger than maximum segment length and
- * maximum packet length since TSO is not supported yet.
- * Make sure that the first segment does not need fragmentation
- * (split into many Tx descriptors).
+ * Any segment of scattered packet cannot be bigger than maximum
+ * segment length. Make sure that subsequent segments do not need
+ * fragmentation (split into many Tx descriptors).
*/
- RTE_BUILD_BUG_ON(SFC_EF100_TX_SEND_DESC_LEN_MAX <
- RTE_MIN((unsigned int)EFX_MAC_PDU_MAX, SFC_MBUF_SEG_LEN_MAX));
+ RTE_BUILD_BUG_ON(SFC_EF100_TX_SEG_DESC_LEN_MAX < SFC_MBUF_SEG_LEN_MAX);
+
+ return m->nb_segs + extra_descs;
+}
+
+static struct rte_mbuf *
+sfc_ef100_xmit_tso_pkt(struct sfc_ef100_txq * const txq,
+ struct rte_mbuf *m, unsigned int *added)
+{
+ struct rte_mbuf *m_seg = m;
+ unsigned int nb_hdr_descs;
+ unsigned int nb_pld_descs;
+ unsigned int seg_split = 0;
+ unsigned int tso_desc_id;
+ unsigned int id;
+ size_t iph_off;
+ size_t tcph_off;
+ size_t header_len;
+ size_t remaining_hdr_len;
+
+ iph_off = m->l2_len;
+ tcph_off = iph_off + m->l3_len;
+ header_len = tcph_off + m->l4_len;
/*
- * Any segment of scattered packet cannot be bigger than maximum
- * segment length and maximum packet length since TSO is not
- * supported yet.
- * Make sure that subsequent segments do not need fragmentation (split
- * into many Tx descriptors).
+ * Remember ID of the TX_TSO descriptor to be filled in.
+ * We can't fill it in right now since we need to calculate
+ * number of header and payload segments first and don't want
+ * to traverse it twice here.
+ */
+ tso_desc_id = (*added)++ & txq->ptr_mask;
+
+ remaining_hdr_len = header_len;
+ do {
+ id = (*added)++ & txq->ptr_mask;
+ if (rte_pktmbuf_data_len(m_seg) <= remaining_hdr_len) {
+ /* The segment is fully header segment */
+ sfc_ef100_tx_qdesc_seg_create(
+ rte_mbuf_data_iova(m_seg),
+ rte_pktmbuf_data_len(m_seg),
+ &txq->txq_hw_ring[id]);
+ remaining_hdr_len -= rte_pktmbuf_data_len(m_seg);
+ } else {
+ /*
+ * The segment must be split into header and
+ * payload segments
+ */
+ sfc_ef100_tx_qdesc_seg_create(
+ rte_mbuf_data_iova(m_seg),
+ remaining_hdr_len,
+ &txq->txq_hw_ring[id]);
+ SFC_ASSERT(txq->sw_ring[id].mbuf == NULL);
+
+ id = (*added)++ & txq->ptr_mask;
+ sfc_ef100_tx_qdesc_seg_create(
+ rte_mbuf_data_iova(m_seg) + remaining_hdr_len,
+ rte_pktmbuf_data_len(m_seg) - remaining_hdr_len,
+ &txq->txq_hw_ring[id]);
+ remaining_hdr_len = 0;
+ seg_split = 1;
+ }
+ txq->sw_ring[id].mbuf = m_seg;
+ m_seg = m_seg->next;
+ } while (remaining_hdr_len > 0);
+
+ /*
+ * If a segment is split into header and payload segments, added
+ * pointer counts it twice and we should correct it.
*/
- RTE_BUILD_BUG_ON(SFC_EF100_TX_SEG_DESC_LEN_MAX <
- RTE_MIN((unsigned int)EFX_MAC_PDU_MAX, SFC_MBUF_SEG_LEN_MAX));
+ nb_hdr_descs = ((id - tso_desc_id) & txq->ptr_mask) - seg_split;
+ nb_pld_descs = m->nb_segs - nb_hdr_descs + seg_split;
+
+ sfc_ef100_tx_qdesc_tso_create(m, nb_hdr_descs, nb_pld_descs, header_len,
+ rte_pktmbuf_pkt_len(m) - header_len,
+ iph_off, tcph_off,
+ &txq->txq_hw_ring[tso_desc_id]);
- return m->nb_segs;
+ return m_seg;
}
static uint16_t
break;
}
- id = added++ & txq->ptr_mask;
- sfc_ef100_tx_qdesc_send_create(m_seg, &txq->txq_hw_ring[id]);
+ if (m_seg->ol_flags & PKT_TX_TCP_SEG) {
+ m_seg = sfc_ef100_xmit_tso_pkt(txq, m_seg, &added);
+ } else {
+ id = added++ & txq->ptr_mask;
+ sfc_ef100_tx_qdesc_send_create(m_seg,
+ &txq->txq_hw_ring[id]);
- /*
- * rte_pktmbuf_free() is commonly used in DPDK for
- * recycling packets - the function checks every
- * segment's reference counter and returns the
- * buffer to its pool whenever possible;
- * nevertheless, freeing mbuf segments one by one
- * may entail some performance decline;
- * from this point, sfc_efx_tx_reap() does the same job
- * on its own and frees buffers in bulks (all mbufs
- * within a bulk belong to the same pool);
- * from this perspective, individual segment pointers
- * must be associated with the corresponding SW
- * descriptors independently so that only one loop
- * is sufficient on reap to inspect all the buffers
- */
- txq->sw_ring[id].mbuf = m_seg;
+ /*
+ * rte_pktmbuf_free() is commonly used in DPDK for
+ * recycling packets - the function checks every
+ * segment's reference counter and returns the
+ * buffer to its pool whenever possible;
+ * nevertheless, freeing mbuf segments one by one
+ * may entail some performance decline;
+ * from this point, sfc_efx_tx_reap() does the same job
+ * on its own and frees buffers in bulks (all mbufs
+ * within a bulk belong to the same pool);
+ * from this perspective, individual segment pointers
+ * must be associated with the corresponding SW
+ * descriptors independently so that only one loop
+ * is sufficient on reap to inspect all the buffers
+ */
+ txq->sw_ring[id].mbuf = m_seg;
+ m_seg = m_seg->next;
+ }
- while ((m_seg = m_seg->next) != NULL) {
+ while (m_seg != NULL) {
RTE_BUILD_BUG_ON(SFC_MBUF_SEG_LEN_MAX >
SFC_EF100_TX_SEG_DESC_LEN_MAX);
rte_pktmbuf_data_len(m_seg),
&txq->txq_hw_ring[id]);
txq->sw_ring[id].mbuf = m_seg;
+ m_seg = m_seg->next;
}
dma_desc_space -= (added - pkt_start);
(info->hw_index << info->vi_window_shift);
txq->evq_hw_ring = info->evq_hw_ring;
+ txq->tso_tcp_header_offset_limit = info->tso_tcp_header_offset_limit;
+ txq->tso_max_nb_header_descs = info->tso_max_nb_header_descs;
+ txq->tso_max_header_len = info->tso_max_header_len;
+ txq->tso_max_nb_payload_descs = info->tso_max_nb_payload_descs;
+ txq->tso_max_payload_len = info->tso_max_payload_len;
+ txq->tso_max_nb_outgoing_frames = info->tso_max_nb_outgoing_frames;
+
sfc_ef100_tx_debug(txq, "TxQ doorbell is %p", txq->doorbell);
*dp_txqp = &txq->dp;
DEV_TX_OFFLOAD_OUTER_UDP_CKSUM |
DEV_TX_OFFLOAD_UDP_CKSUM |
DEV_TX_OFFLOAD_TCP_CKSUM |
- DEV_TX_OFFLOAD_MULTI_SEGS,
+ DEV_TX_OFFLOAD_MULTI_SEGS |
+ DEV_TX_OFFLOAD_TCP_TSO,
.get_dev_info = sfc_ef100_get_dev_info,
.qsize_up_rings = sfc_ef100_tx_qsize_up_rings,
.qcreate = sfc_ef100_tx_qcreate,
git.droids-corp.org / dpdk.git / commitdiff