net/vmxnet3: allow variable length Tx data ring

vmxnet3 driver supports transmit data ring viz. a set of fixed size
buffers used by the driver to copy packet headers. Small packets that
fit these buffers are copied into these buffers entirely.

Currently this buffer size of fixed at 128 bytes. This patch extends
transmit data ring implementation to allow variable length transmit
data ring buffers. The length of the buffer is read from the emulation
during initialization.

Signed-off-by: Shrikrishna Khare <skhare@vmware.com>
Acked-by: Yong Wang <yongwang@vmware.com>
Acked-by: Jin Heo <heoj@vmware.com>

diff --git a/drivers/net/vmxnet3/base/vmxnet3_defs.h b/drivers/net/vmxnet3/base/vmxnet3_defs.h
index 7484b84..e201808 100644 (file)
--- a/drivers/net/vmxnet3/base/vmxnet3_defs.h
+++ b/drivers/net/vmxnet3/base/vmxnet3_defs.h
@@ -121,7 +121,8 @@ typedef enum {
    VMXNET3_CMD_GET_DID_HI,
    VMXNET3_CMD_GET_DEV_EXTRA_INFO,
    VMXNET3_CMD_GET_CONF_INTR,
-   VMXNET3_CMD_GET_ADAPTIVE_RING_INFO
+   VMXNET3_CMD_GET_ADAPTIVE_RING_INFO,
+   VMXNET3_CMD_GET_TXDATA_DESC_SIZE
 } Vmxnet3_Cmd;
 
 /* Adaptive Ring Info Flags */
@@ -403,12 +404,19 @@ typedef union Vmxnet3_GenericDesc {
 #define VMXNET3_RING_SIZE_ALIGN 32
 #define VMXNET3_RING_SIZE_MASK  (VMXNET3_RING_SIZE_ALIGN - 1)
 
+/* Tx Data Ring buffer size must be a multiple of 64 */
+#define VMXNET3_TXDATA_DESC_SIZE_ALIGN 64
+#define VMXNET3_TXDATA_DESC_SIZE_MASK  (VMXNET3_TXDATA_DESC_SIZE_ALIGN - 1)
+
 /* Max ring size */
 #define VMXNET3_TX_RING_MAX_SIZE   4096
 #define VMXNET3_TC_RING_MAX_SIZE   4096
 #define VMXNET3_RX_RING_MAX_SIZE   4096
 #define VMXNET3_RC_RING_MAX_SIZE   8192
 
+#define VMXNET3_TXDATA_DESC_MIN_SIZE 128
+#define VMXNET3_TXDATA_DESC_MAX_SIZE 2048
+
 /* a list of reasons for queue stop */
 
 #define VMXNET3_ERR_NOEOP        0x80000000  /* cannot find the EOP desc of a pkt */
@@ -508,7 +516,9 @@ struct Vmxnet3_TxQueueConf {
    __le32    compRingSize; /* # of comp desc */
    __le32    ddLen;        /* size of driver data */
    uint8     intrIdx;
-   uint8     _pad[7];
+   uint8     _pad[1];
+   __le16    txDataRingDescSize;
+   uint8     _pad2[4];
 }
 #include "vmware_pack_end.h"
 Vmxnet3_TxQueueConf;

diff --git a/drivers/net/vmxnet3/vmxnet3_ethdev.c b/drivers/net/vmxnet3/vmxnet3_ethdev.c
index 09f2085..05b0864 100644 (file)
--- a/drivers/net/vmxnet3/vmxnet3_ethdev.c
+++ b/drivers/net/vmxnet3/vmxnet3_ethdev.c
@@ -224,6 +224,24 @@ vmxnet3_disable_intr(struct vmxnet3_hw *hw)
                VMXNET3_WRITE_BAR0_REG(hw, VMXNET3_REG_IMR + i * 8, 1);
 }
 
+/*
+ * Gets tx data ring descriptor size.
+ */
+static uint16_t
+eth_vmxnet3_txdata_get(struct vmxnet3_hw *hw)
+{
+       uint16 txdata_desc_size;
+
+       VMXNET3_WRITE_BAR1_REG(hw, VMXNET3_REG_CMD,
+                              VMXNET3_CMD_GET_TXDATA_DESC_SIZE);
+       txdata_desc_size = VMXNET3_READ_BAR1_REG(hw, VMXNET3_REG_CMD);
+
+       return (txdata_desc_size < VMXNET3_TXDATA_DESC_MIN_SIZE ||
+               txdata_desc_size > VMXNET3_TXDATA_DESC_MAX_SIZE ||
+               txdata_desc_size & VMXNET3_TXDATA_DESC_SIZE_MASK) ?
+               sizeof(struct Vmxnet3_TxDataDesc) : txdata_desc_size;
+}
+
 /*
  * It returns 0 on success.
  */
@@ -320,6 +338,9 @@ eth_vmxnet3_dev_init(struct rte_eth_dev *eth_dev)
        /* allow untagged pkts */
        VMXNET3_SET_VFTABLE_ENTRY(hw->shadow_vfta, 0);
 
+       hw->txdata_desc_size = VMXNET3_VERSION_GE_3(hw) ?
+               eth_vmxnet3_txdata_get(hw) : sizeof(struct Vmxnet3_TxDataDesc);
+
        return 0;
 }
 
@@ -511,6 +532,7 @@ vmxnet3_setup_driver_shared(struct rte_eth_dev *dev)
                tqd->conf.txRingSize   = txq->cmd_ring.size;
                tqd->conf.compRingSize = txq->comp_ring.size;
                tqd->conf.dataRingSize = txq->data_ring.size;
+               tqd->conf.txDataRingDescSize = txq->txdata_desc_size;
                tqd->conf.intrIdx      = txq->comp_ring.intr_idx;
                tqd->status.stopped    = TRUE;
                tqd->status.error      = 0;

diff --git a/drivers/net/vmxnet3/vmxnet3_ethdev.h b/drivers/net/vmxnet3/vmxnet3_ethdev.h
index 3cc8979..f1c8bc1 100644 (file)
--- a/drivers/net/vmxnet3/vmxnet3_ethdev.h
+++ b/drivers/net/vmxnet3/vmxnet3_ethdev.h
@@ -103,6 +103,8 @@ struct vmxnet3_hw {
 
        uint8_t version;
 
+       uint16_t txdata_desc_size; /* tx 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 b50d2b0..b27290f 100644 (file)
--- a/drivers/net/vmxnet3/vmxnet3_ring.h
+++ b/drivers/net/vmxnet3/vmxnet3_ring.h
@@ -141,6 +141,7 @@ typedef struct vmxnet3_tx_queue {
        bool                         stopped;
        uint16_t                     queue_id;      /**< Device TX queue index. */
        uint8_t                      port_id;       /**< Device port identifier. */
+       uint16_t                     txdata_desc_size;
 } vmxnet3_tx_queue_t;
 
 struct vmxnet3_rxq_stats {

diff --git a/drivers/net/vmxnet3/vmxnet3_rxtx.c b/drivers/net/vmxnet3/vmxnet3_rxtx.c
index b246884..705b601 100644 (file)
--- a/drivers/net/vmxnet3/vmxnet3_rxtx.c
+++ b/drivers/net/vmxnet3/vmxnet3_rxtx.c
@@ -244,7 +244,7 @@ vmxnet3_dev_tx_queue_reset(void *txq)
 
        size = sizeof(struct Vmxnet3_TxDesc) * ring->size;
        size += sizeof(struct Vmxnet3_TxCompDesc) * comp_ring->size;
-       size += sizeof(struct Vmxnet3_TxDataDesc) * data_ring->size;
+       size += tq->txdata_desc_size * data_ring->size;
 
        memset(ring->base, 0, size);
 }
@@ -471,10 +471,13 @@ vmxnet3_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
                }
 
                if (txm->nb_segs == 1 &&
-                   rte_pktmbuf_pkt_len(txm) <= VMXNET3_HDR_COPY_SIZE) {
+                   rte_pktmbuf_pkt_len(txm) <= txq->txdata_desc_size) {
                        struct Vmxnet3_TxDataDesc *tdd;
 
-                       tdd = txq->data_ring.base + txq->cmd_ring.next2fill;
+                       tdd = (struct Vmxnet3_TxDataDesc *)
+                               ((uint8 *)txq->data_ring.base +
+                                txq->cmd_ring.next2fill *
+                                txq->txdata_desc_size);
                        copy_size = rte_pktmbuf_pkt_len(txm);
                        rte_memcpy(tdd->data, rte_pktmbuf_mtod(txm, char *), copy_size);
                }
@@ -491,12 +494,15 @@ vmxnet3_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
                         * maximum size of mbuf segment size.
                         */
                        gdesc = txq->cmd_ring.base + txq->cmd_ring.next2fill;
-                       if (copy_size)
-                               gdesc->txd.addr = rte_cpu_to_le_64(txq->data_ring.basePA +
-                                                                  txq->cmd_ring.next2fill *
-                                                                  sizeof(struct Vmxnet3_TxDataDesc));
-                       else
+                       if (copy_size) {
+                               uint64 offset = txq->cmd_ring.next2fill *
+                                               txq->txdata_desc_size;
+                               gdesc->txd.addr =
+                                       rte_cpu_to_le_64(txq->data_ring.basePA +
+                                                        offset);
+                       } else {
                                gdesc->txd.addr = rte_mbuf_data_dma_addr(m_seg);
+                       }
 
                        gdesc->dword[2] = dw2 | m_seg->data_len;
                        gdesc->dword[3] = 0;
@@ -932,6 +938,7 @@ vmxnet3_dev_tx_queue_setup(struct rte_eth_dev *dev,
        txq->hw = hw;
        txq->qid = queue_idx;
        txq->stopped = TRUE;
+       txq->txdata_desc_size = hw->txdata_desc_size;
 
        ring = &txq->cmd_ring;
        comp_ring = &txq->comp_ring;
@@ -961,7 +968,7 @@ vmxnet3_dev_tx_queue_setup(struct rte_eth_dev *dev,
 
        size = sizeof(struct Vmxnet3_TxDesc) * ring->size;
        size += sizeof(struct Vmxnet3_TxCompDesc) * comp_ring->size;
-       size += sizeof(struct Vmxnet3_TxDataDesc) * data_ring->size;
+       size += txq->txdata_desc_size * data_ring->size;
 
        mz = ring_dma_zone_reserve(dev, "txdesc", queue_idx, size, socket_id);
        if (mz == NULL) {