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net/sfc: implement simple EF10 native Tx datapath

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The datapath does not support VLAN insertion, TSO and multi-segment
mbufs.

Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
This commit is contained in:
Andrew Rybchenko 2017-03-20 10:15:19 +00:00 committed by Ferruh Yigit
parent ea2ed84c2f
commit 5688520075
5 changed files with 82 additions and 2 deletions
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5
doc/guides/nics/sfc_efx.rst
View File

@ -236,7 +236,7 @@ boolean parameters value.
more efficient than libefx-based and provides richer packet type
classification, but lacks Rx scatter support.
- ``tx_datapath`` [auto|efx|ef10] (default **auto**)
- ``tx_datapath`` [auto|efx|ef10|ef10_simple] (default **auto**)
Choose transmit datapath implementation.
**auto** allows the driver itself to make a choice based on firmware
@ -246,6 +246,9 @@ boolean parameters value.
**ef10** chooses EF10 (SFN7xxx, SFN8xxx) native datapath which is
more efficient than libefx-based but has no VLAN insertion and TSO
support yet.
**ef10_simple** chooses EF10 (SFN7xxx, SFN8xxx) native datapath which
is even more faster then **ef10** but does not support multi-segment
mbufs.
- ``perf_profile`` [auto|throughput|low-latency] (default **throughput**)

1
drivers/net/sfc/sfc_dp_tx.h
View File

@ -162,6 +162,7 @@ sfc_dp_find_tx_by_caps(struct sfc_dp_list *head, unsigned int avail_caps)
extern struct sfc_dp_tx sfc_efx_tx;
extern struct sfc_dp_tx sfc_ef10_tx;
extern struct sfc_dp_tx sfc_ef10_simple_tx;
#ifdef __cplusplus
}

73
drivers/net/sfc/sfc_ef10_tx.c
View File

@ -313,6 +313,64 @@ sfc_ef10_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
return pktp - &tx_pkts[0];
}
static uint16_t
sfc_ef10_simple_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
uint16_t nb_pkts)
{
struct sfc_ef10_txq * const txq = sfc_ef10_txq_by_dp_txq(tx_queue);
unsigned int ptr_mask;
unsigned int added;
unsigned int dma_desc_space;
bool reap_done;
struct rte_mbuf **pktp;
struct rte_mbuf **pktp_end;
if (unlikely(txq->flags &
(SFC_EF10_TXQ_NOT_RUNNING | SFC_EF10_TXQ_EXCEPTION)))
return 0;
ptr_mask = txq->ptr_mask;
added = txq->added;
dma_desc_space = SFC_EF10_TXQ_LIMIT(ptr_mask + 1) -
(added - txq->completed);
reap_done = (dma_desc_space < RTE_MAX(txq->free_thresh, nb_pkts));
if (reap_done) {
sfc_ef10_tx_reap(txq);
dma_desc_space = SFC_EF10_TXQ_LIMIT(ptr_mask + 1) -
(added - txq->completed);
}
pktp_end = &tx_pkts[MIN(nb_pkts, dma_desc_space)];
for (pktp = &tx_pkts[0]; pktp != pktp_end; ++pktp) {
struct rte_mbuf *pkt = *pktp;
unsigned int id = added & ptr_mask;
SFC_ASSERT(rte_pktmbuf_data_len(pkt) <=
SFC_EF10_TX_DMA_DESC_LEN_MAX);
sfc_ef10_tx_qdesc_dma_create(rte_mbuf_data_dma_addr(pkt),
rte_pktmbuf_data_len(pkt),
true, &txq->txq_hw_ring[id]);
txq->sw_ring[id].mbuf = pkt;
++added;
}
if (likely(added != txq->added)) {
sfc_ef10_tx_qpush(txq, added, txq->added);
txq->added = added;
}
#if SFC_TX_XMIT_PKTS_REAP_AT_LEAST_ONCE
if (!reap_done)
sfc_ef10_tx_reap(txq);
#endif
return pktp - &tx_pkts[0];
}
static sfc_dp_tx_qcreate_t sfc_ef10_tx_qcreate;
static int
@ -449,3 +507,18 @@ struct sfc_dp_tx sfc_ef10_tx = {
.qreap = sfc_ef10_tx_qreap,
.pkt_burst = sfc_ef10_xmit_pkts,
};
struct sfc_dp_tx sfc_ef10_simple_tx = {
.dp = {
.name = SFC_KVARG_DATAPATH_EF10_SIMPLE,
.type = SFC_DP_TX,
},
.features = 0,
.qcreate = sfc_ef10_tx_qcreate,
.qdestroy = sfc_ef10_tx_qdestroy,
.qstart = sfc_ef10_tx_qstart,
.qtx_ev = sfc_ef10_tx_qtx_ev,
.qstop = sfc_ef10_tx_qstop,
.qreap = sfc_ef10_tx_qreap,
.pkt_burst = sfc_ef10_simple_xmit_pkts,
};

1
drivers/net/sfc/sfc_ethdev.c
View File

@ -1470,6 +1470,7 @@ sfc_register_dp(void)
sfc_dp_register(&sfc_dp_head, &sfc_ef10_tx.dp);
sfc_dp_register(&sfc_dp_head, &sfc_efx_tx.dp);
sfc_dp_register(&sfc_dp_head, &sfc_ef10_simple_tx.dp);
}
}

4
drivers/net/sfc/sfc_kvargs.h
View File

@ -58,6 +58,7 @@ extern "C" {
#define SFC_KVARG_DATAPATH_EFX "efx"
#define SFC_KVARG_DATAPATH_EF10 "ef10"
#define SFC_KVARG_DATAPATH_EF10_SIMPLE "ef10_simple"
#define SFC_KVARG_RX_DATAPATH "rx_datapath"
#define SFC_KVARG_VALUES_RX_DATAPATH \
@ -67,7 +68,8 @@ extern "C" {
#define SFC_KVARG_TX_DATAPATH "tx_datapath"
#define SFC_KVARG_VALUES_TX_DATAPATH \
"[" SFC_KVARG_DATAPATH_EFX "|" \
SFC_KVARG_DATAPATH_EF10 "]"
SFC_KVARG_DATAPATH_EF10 "|" \
SFC_KVARG_DATAPATH_EF10_SIMPLE "]"
struct sfc_adapter;