[dpdk-dev] [PATCH 4/7] vmxnet3: add receive data ring support
Shrikrishna Khare
skhare at vmware.com
Sat Feb 25 22:59:46 CET 2017
vmxnet3 driver preallocates buffers for receiving packets and posts the
buffers to the emulation. In order to deliver a received packet to the
guest, the emulation must map buffer(s) and copy the packet into it.
To avoid this memory mapping overhead, this patch introduces the receive
data ring - a set of small sized buffers that are always mapped by
the emulation. If a packet fits into the receive data ring buffer, the
emulation delivers the packet via the receive data ring (which must be
copied by the guest driver), or else the usual receive path is used.
Receive Data Ring buffer length is configurable via ethtool -G ethX rx-mini
Signed-off-by: Shrikrishna Khare <skhare at vmware.com>
Acked-by: Yong Wang <yongwang at vmware.com>
Acked-by: Jin Heo <heoj at vmware.com>
---
drivers/net/vmxnet3/base/vmxnet3_defs.h | 12 ++++++++++--
drivers/net/vmxnet3/vmxnet3_ethdev.c | 9 +++++++++
drivers/net/vmxnet3/vmxnet3_ethdev.h | 1 +
drivers/net/vmxnet3/vmxnet3_ring.h | 20 ++++++++++++++++++++
drivers/net/vmxnet3/vmxnet3_rxtx.c | 31 ++++++++++++++++++++++++++++++-
5 files changed, 70 insertions(+), 3 deletions(-)
diff --git a/drivers/net/vmxnet3/base/vmxnet3_defs.h b/drivers/net/vmxnet3/base/vmxnet3_defs.h
index e201808..746d709 100644
--- a/drivers/net/vmxnet3/base/vmxnet3_defs.h
+++ b/drivers/net/vmxnet3/base/vmxnet3_defs.h
@@ -408,6 +408,10 @@ typedef union Vmxnet3_GenericDesc {
#define VMXNET3_TXDATA_DESC_SIZE_ALIGN 64
#define VMXNET3_TXDATA_DESC_SIZE_MASK (VMXNET3_TXDATA_DESC_SIZE_ALIGN - 1)
+/* Rx Data Ring buffer size must be a multiple of 64 */
+#define VMXNET3_RXDATA_DESC_SIZE_ALIGN 64
+#define VMXNET3_RXDATA_DESC_SIZE_MASK (VMXNET3_RXDATA_DESC_SIZE_ALIGN - 1)
+
/* Max ring size */
#define VMXNET3_TX_RING_MAX_SIZE 4096
#define VMXNET3_TC_RING_MAX_SIZE 4096
@@ -417,6 +421,8 @@ typedef union Vmxnet3_GenericDesc {
#define VMXNET3_TXDATA_DESC_MIN_SIZE 128
#define VMXNET3_TXDATA_DESC_MAX_SIZE 2048
+#define VMXNET3_RXDATA_DESC_MAX_SIZE 2048
+
/* a list of reasons for queue stop */
#define VMXNET3_ERR_NOEOP 0x80000000 /* cannot find the EOP desc of a pkt */
@@ -529,12 +535,14 @@ struct Vmxnet3_RxQueueConf {
__le64 rxRingBasePA[2];
__le64 compRingBasePA;
__le64 ddPA; /* driver data */
- __le64 reserved;
+ __le64 rxDataRingBasePA;
__le32 rxRingSize[2]; /* # of rx desc */
__le32 compRingSize; /* # of rx comp desc */
__le32 ddLen; /* size of driver data */
uint8 intrIdx;
- uint8 _pad[7];
+ uint8 _pad1[1];
+ __le16 rxDataRingDescSize; /* size of rx data ring buffer */
+ uint8 _pad2[4];
}
#include "vmware_pack_end.h"
Vmxnet3_RxQueueConf;
diff --git a/drivers/net/vmxnet3/vmxnet3_ethdev.c b/drivers/net/vmxnet3/vmxnet3_ethdev.c
index 05b0864..8591ce1 100644
--- a/drivers/net/vmxnet3/vmxnet3_ethdev.c
+++ b/drivers/net/vmxnet3/vmxnet3_ethdev.c
@@ -341,6 +341,11 @@ eth_vmxnet3_dev_init(struct rte_eth_dev *eth_dev)
hw->txdata_desc_size = VMXNET3_VERSION_GE_3(hw) ?
eth_vmxnet3_txdata_get(hw) : sizeof(struct Vmxnet3_TxDataDesc);
+ hw->rxdata_desc_size = VMXNET3_VERSION_GE_3(hw) ?
+ VMXNET3_DEF_RXDATA_DESC_SIZE : 0;
+ RTE_ASSERT((hw->rx_data_desc_size & ~VMXNET3_RXDATA_DESC_SIZE_MASK) ==
+ hw->rx_data_desc_size);
+
return 0;
}
@@ -551,6 +556,10 @@ vmxnet3_setup_driver_shared(struct rte_eth_dev *dev)
rqd->conf.rxRingSize[1] = rxq->cmd_ring[1].size;
rqd->conf.compRingSize = rxq->comp_ring.size;
rqd->conf.intrIdx = rxq->comp_ring.intr_idx;
+ if (VMXNET3_VERSION_GE_3(hw)) {
+ rqd->conf.rxDataRingBasePA = rxq->data_ring.basePA;
+ rqd->conf.rxDataRingDescSize = rxq->data_desc_size;
+ }
rqd->status.stopped = TRUE;
rqd->status.error = 0;
memset(&rqd->stats, 0, sizeof(rqd->stats));
diff --git a/drivers/net/vmxnet3/vmxnet3_ethdev.h b/drivers/net/vmxnet3/vmxnet3_ethdev.h
index f8e670d..1c1afc6 100644
--- a/drivers/net/vmxnet3/vmxnet3_ethdev.h
+++ b/drivers/net/vmxnet3/vmxnet3_ethdev.h
@@ -104,6 +104,7 @@ struct vmxnet3_hw {
uint8_t version;
uint16_t txdata_desc_size; /* tx data ring buffer size */
+ uint16_t rxdata_desc_size; /* rx data ring buffer size */
Vmxnet3_TxQueueDesc *tqd_start; /* start address of all tx queue desc */
Vmxnet3_RxQueueDesc *rqd_start; /* start address of all rx queue desc */
diff --git a/drivers/net/vmxnet3/vmxnet3_ring.h b/drivers/net/vmxnet3/vmxnet3_ring.h
index b27290f..8bc8239 100644
--- a/drivers/net/vmxnet3/vmxnet3_ring.h
+++ b/drivers/net/vmxnet3/vmxnet3_ring.h
@@ -42,6 +42,9 @@
#define VMXNET3_DEF_TX_RING_SIZE 512
#define VMXNET3_DEF_RX_RING_SIZE 128
+/* Default rx data ring desc size */
+#define VMXNET3_DEF_RXDATA_DESC_SIZE 128
+
#define VMXNET3_SUCCESS 0
#define VMXNET3_FAIL -1
@@ -66,6 +69,14 @@ typedef struct vmxnet3_cmd_ring {
uint64_t basePA;
} vmxnet3_cmd_ring_t;
+#define VMXNET3_GET_RING_IDX(hw, rqID) \
+ ((rqID >= hw->num_rx_queues && \
+ rqID < 2 * hw->num_rx_queues) ? 1 : 0) \
+
+#define VMXNET3_RX_DATA_RING(hw, rqID) \
+ (rqID >= 2 * hw->num_rx_queues && \
+ rqID < 3 * hw->num_rx_queues) \
+
static inline void
vmxnet3_cmd_ring_adv_next2fill(struct vmxnet3_cmd_ring *ring)
{
@@ -151,13 +162,22 @@ struct vmxnet3_rxq_stats {
uint64_t rx_buf_alloc_failure;
};
+struct vmxnet3_rx_data_ring {
+ uint8_t *base;
+ uint64_t basePA;
+ uint32_t size;
+};
+
typedef struct vmxnet3_rx_queue {
struct rte_mempool *mp;
struct vmxnet3_hw *hw;
struct vmxnet3_cmd_ring cmd_ring[VMXNET3_RX_CMDRING_SIZE];
struct vmxnet3_comp_ring comp_ring;
+ struct vmxnet3_rx_data_ring data_ring;
+ uint16_t data_desc_size;
uint32_t qid1;
uint32_t qid2;
+ uint32_t data_ring_qid; /* rqID in RCD for buffer from data ring */
Vmxnet3_RxQueueDesc *shared;
struct rte_mbuf *start_seg;
struct rte_mbuf *last_seg;
diff --git a/drivers/net/vmxnet3/vmxnet3_rxtx.c b/drivers/net/vmxnet3/vmxnet3_rxtx.c
index 920ea0e..d8a109e 100644
--- a/drivers/net/vmxnet3/vmxnet3_rxtx.c
+++ b/drivers/net/vmxnet3/vmxnet3_rxtx.c
@@ -254,8 +254,10 @@ vmxnet3_dev_rx_queue_reset(void *rxq)
{
int i;
vmxnet3_rx_queue_t *rq = rxq;
+ struct vmxnet3_hw *hw = rq->hw;
struct vmxnet3_cmd_ring *ring0, *ring1;
struct vmxnet3_comp_ring *comp_ring;
+ struct vmxnet3_rx_data_ring *data_ring = &rq->data_ring;
int size;
if (rq != NULL) {
@@ -280,6 +282,9 @@ vmxnet3_dev_rx_queue_reset(void *rxq)
size = sizeof(struct Vmxnet3_RxDesc) * (ring0->size + ring1->size);
size += sizeof(struct Vmxnet3_RxCompDesc) * comp_ring->size;
+ if (VMXNET3_VERSION_GE_3(hw) && rq->data_desc_size) {
+ size += rq->data_desc_size * data_ring->size;
+ }
memset(ring0->base, 0, size);
}
@@ -755,7 +760,7 @@ vmxnet3_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
}
idx = rcd->rxdIdx;
- ring_idx = (uint8_t)((rcd->rqID == rxq->qid1) ? 0 : 1);
+ ring_idx = VMXNET3_GET_RING_IDX(hw, rcd->rqID);
rxd = (Vmxnet3_RxDesc *)rxq->cmd_ring[ring_idx].base + idx;
RTE_SET_USED(rxd); /* used only for assert when enabled */
rbi = rxq->cmd_ring[ring_idx].buf_info + idx;
@@ -821,6 +826,15 @@ vmxnet3_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
goto rcd_done;
}
+ if (VMXNET3_RX_DATA_RING(hw, rcd->rqID)) {
+ uint8_t *rdd = rxq->data_ring.base +
+ idx * rxq->data_desc_size;
+
+ RTE_ASSERT(VMXNET3_VERSION_GE_3(hw));
+ rte_memcpy(rte_pktmbuf_mtod(rxm, char *),
+ rdd, rcd->len);
+ }
+
rxq->start_seg = rxm;
vmxnet3_rx_offload(rcd, rxm);
} else {
@@ -1015,6 +1029,7 @@ vmxnet3_dev_rx_queue_setup(struct rte_eth_dev *dev,
struct vmxnet3_hw *hw = dev->data->dev_private;
struct vmxnet3_cmd_ring *ring0, *ring1, *ring;
struct vmxnet3_comp_ring *comp_ring;
+ struct vmxnet3_rx_data_ring *data_ring;
int size;
uint8_t i;
char mem_name[32];
@@ -1035,11 +1050,14 @@ vmxnet3_dev_rx_queue_setup(struct rte_eth_dev *dev,
rxq->hw = hw;
rxq->qid1 = queue_idx;
rxq->qid2 = queue_idx + hw->num_rx_queues;
+ rxq->data_ring_qid = queue_idx + 2 * hw->num_rx_queues;
+ rxq->data_desc_size = hw->rxdata_desc_size;
rxq->stopped = TRUE;
ring0 = &rxq->cmd_ring[0];
ring1 = &rxq->cmd_ring[1];
comp_ring = &rxq->comp_ring;
+ data_ring = &rxq->data_ring;
/* Rx vmxnet rings length should be between 256-4096 */
if (nb_desc < VMXNET3_DEF_RX_RING_SIZE) {
@@ -1055,6 +1073,7 @@ vmxnet3_dev_rx_queue_setup(struct rte_eth_dev *dev,
}
comp_ring->size = ring0->size + ring1->size;
+ data_ring->size = ring0->size;
/* Rx vmxnet rings structure initialization */
ring0->next2fill = 0;
@@ -1068,6 +1087,9 @@ vmxnet3_dev_rx_queue_setup(struct rte_eth_dev *dev,
size = sizeof(struct Vmxnet3_RxDesc) * (ring0->size + ring1->size);
size += sizeof(struct Vmxnet3_RxCompDesc) * comp_ring->size;
+ if (VMXNET3_VERSION_GE_3(hw) && rxq->data_desc_size) {
+ size += rxq->data_desc_size * data_ring->size;
+ }
mz = ring_dma_zone_reserve(dev, "rxdesc", queue_idx, size, socket_id);
if (mz == NULL) {
@@ -1089,6 +1111,13 @@ vmxnet3_dev_rx_queue_setup(struct rte_eth_dev *dev,
comp_ring->basePA = ring1->basePA + sizeof(struct Vmxnet3_RxDesc) *
ring1->size;
+ /* data_ring initialization */
+ if (VMXNET3_VERSION_GE_3(hw) && rxq->data_desc_size) {
+ data_ring->base = (uint8_t *)(comp_ring->base + comp_ring->size);
+ data_ring->basePA = comp_ring->basePA +
+ sizeof(struct Vmxnet3_RxCompDesc) * comp_ring->size;
+ }
+
/* cmd_ring0-cmd_ring1 buf_info allocation */
for (i = 0; i < VMXNET3_RX_CMDRING_SIZE; i++) {
--
2.6.2
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