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d29b843a0f
By increasing the ring descriptor count the throughput increased from few kB/s to the range of MB/s. Issue #3939
115 lines
3.2 KiB
Diff
115 lines
3.2 KiB
Diff
--- a/src/drivers/net/realtek.c
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+++ b/src/drivers/net/realtek.c
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@@ -565,6 +565,18 @@
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}
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/**
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+ * Return tx descriptor count depending on mode
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+ */
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+static int rtl_num_tx_desc(struct realtek_nic *rtl) {
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+ return (rtl->legacy) ? 4 : RTL_NUM_TX_DESC; }
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+
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+/**
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+ * Return rx descriptor count depending on mode
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+ */
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+static int rtl_num_rx_desc(struct realtek_nic *rtl) {
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+ return (rtl->legacy) ? 4 : RTL_NUM_RX_DESC; }
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+
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+/**
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* Refill receive descriptor ring
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*
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* @v rtl Realtek device
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@@ -580,7 +592,7 @@
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if ( rtl->legacy )
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return;
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- while ( ( rtl->rx.prod - rtl->rx.cons ) < RTL_NUM_RX_DESC ) {
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+ while ( ( rtl->rx.prod - rtl->rx.cons ) < rtl_num_rx_desc(rtl) ) {
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/* Allocate I/O buffer */
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iobuf = alloc_iob ( RTL_RX_MAX_LEN );
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@@ -590,8 +602,8 @@
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}
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/* Get next receive descriptor */
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- rx_idx = ( rtl->rx.prod++ % RTL_NUM_RX_DESC );
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- is_last = ( rx_idx == ( RTL_NUM_RX_DESC - 1 ) );
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+ rx_idx = ( rtl->rx.prod++ % rtl_num_rx_desc(rtl) );
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+ is_last = ( rx_idx == ( rtl_num_rx_desc(rtl) - 1 ) );
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rx = &rtl->rx.desc[rx_idx];
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/* Populate receive descriptor */
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@@ -697,7 +709,7 @@
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realtek_destroy_ring ( rtl, &rtl->rx );
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/* Discard any unused receive buffers */
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- for ( i = 0 ; i < RTL_NUM_RX_DESC ; i++ ) {
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+ for ( i = 0 ; i < rtl_num_rx_desc(rtl) ; i++ ) {
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if ( rtl->rx_iobuf[i] )
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free_iob ( rtl->rx_iobuf[i] );
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rtl->rx_iobuf[i] = NULL;
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@@ -723,11 +735,11 @@
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int is_last;
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/* Get next transmit descriptor */
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- if ( ( rtl->tx.prod - rtl->tx.cons ) >= RTL_NUM_TX_DESC ) {
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+ if ( ( rtl->tx.prod - rtl->tx.cons ) >= rtl_num_tx_desc(rtl) ) {
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netdev_tx_defer ( netdev, iobuf );
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return 0;
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}
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- tx_idx = ( rtl->tx.prod++ % RTL_NUM_TX_DESC );
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+ tx_idx = ( rtl->tx.prod++ % rtl_num_tx_desc(rtl) );
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/* Transmit packet */
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if ( rtl->legacy ) {
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@@ -752,7 +764,7 @@
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/* Populate transmit descriptor */
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address = virt_to_bus ( iobuf->data );
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- is_last = ( tx_idx == ( RTL_NUM_TX_DESC - 1 ) );
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+ is_last = ( tx_idx == ( rtl_num_tx_desc(rtl) - 1 ) );
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tx = &rtl->tx.desc[tx_idx];
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tx->address = cpu_to_le64 ( address );
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tx->length = cpu_to_le16 ( iob_len ( iobuf ) );
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@@ -788,7 +800,7 @@
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while ( rtl->tx.cons != rtl->tx.prod ) {
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/* Get next transmit descriptor */
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- tx_idx = ( rtl->tx.cons % RTL_NUM_TX_DESC );
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+ tx_idx = ( rtl->tx.cons % rtl_num_tx_desc(rtl) );
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/* Stop if descriptor is still in use */
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if ( rtl->legacy ) {
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@@ -892,7 +904,7 @@
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while ( rtl->rx.cons != rtl->rx.prod ) {
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/* Get next receive descriptor */
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- rx_idx = ( rtl->rx.cons % RTL_NUM_RX_DESC );
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+ rx_idx = ( rtl->rx.cons % rtl_num_rx_desc(rtl) );
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rx = &rtl->rx.desc[rx_idx];
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/* Stop if descriptor is still in use */
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--- a/src/drivers/net/realtek.h
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+++ b/src/drivers/net/realtek.h
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@@ -88,9 +88,9 @@
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/** Number of transmit descriptors
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*
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- * This is a hardware limit when using legacy mode.
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+ * 4 is a hardware limit when using legacy mode.
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*/
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-#define RTL_NUM_TX_DESC 4
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+#define RTL_NUM_TX_DESC 64
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/** Receive Buffer Start Address (dword, 8139 only) */
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#define RTL_RBSTART 0x30
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@@ -223,7 +223,7 @@
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#define RTL_RDSAR 0xe4
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/** Number of receive descriptors */
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-#define RTL_NUM_RX_DESC 4
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+#define RTL_NUM_RX_DESC 64
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/** Receive buffer length */
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#define RTL_RX_MAX_LEN ( ETH_FRAME_LEN + 4 /* VLAN */ + 4 /* CRC */ )
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