[PATCH v2 net-next 3/8] vmxnet3: add support for large passthrough BAR register

Ronak Doshi
2022-06-07T08:46:13Z

For vmxnet3 to work in UPT mode, the BAR sizes have been increased.
The PT page has been extended to 2 pages and also includes OOB pages
as a part of PT BAR. This patch enhances vmxnet3 to use appropriate
BAR offsets based on the capability registered. To use new offsets,
VMXNET3_CAP_LARGE_BAR needs to be set by the device. If it is not set
then the device will use legacy PT page layout.

Signed-off-by: Ronak Doshi <doshir@vmware.com>
Acked-by: Guolin Yang <gyang@vmware.com>
---
drivers/net/vmxnet3/vmxnet3_defs.h | 14 ++++++++++++--
drivers/net/vmxnet3/vmxnet3_drv.c | 25 ++++++++++++++++++++-----
drivers/net/vmxnet3/vmxnet3_ethtool.c | 6 +++---
drivers/net/vmxnet3/vmxnet3_int.h | 3 +++
4 files changed, 38 insertions(+), 10 deletions(-)

diff --git a/drivers/net/vmxnet3/vmxnet3_defs.h b/drivers/net/vmxnet3/vmxnet3_defs.h
index 0157155ff677..8d626611ab2d 100644
--- a/drivers/net/vmxnet3/vmxnet3_defs.h
+++ b/drivers/net/vmxnet3/vmxnet3_defs.h
@@ -57,8 +57,18 @@ enum {
VMXNET3_REG_RXPROD2 = 0xA00 /* Rx Producer Index for ring 2 */
};

-#define VMXNET3_PT_REG_SIZE 4096 /* BAR 0 */
-#define VMXNET3_VD_REG_SIZE 4096 /* BAR 1 */
+/* For Large PT BAR, the following offset to DB register */
+enum {
+ VMXNET3_REG_LB_TXPROD = 0x1000, /* Tx Producer Index */
+ VMXNET3_REG_LB_RXPROD = 0x1400, /* Rx Producer Index for ring 1 */
+ VMXNET3_REG_LB_RXPROD2 = 0x1800, /* Rx Producer Index for ring 2 */
+};
+
+#define VMXNET3_PT_REG_SIZE 4096 /* BAR 0 */
+#define VMXNET3_LARGE_PT_REG_SIZE 8192 /* large PT pages */
+#define VMXNET3_VD_REG_SIZE 4096 /* BAR 1 */
+#define VMXNET3_LARGE_BAR0_REG_SIZE (4096 * 4096) /* LARGE BAR 0 */
+#define VMXNET3_OOB_REG_SIZE (4094 * 4096) /* OOB pages */

#define VMXNET3_REG_ALIGN 8 /* All registers are 8-byte aligned. */
#define VMXNET3_REG_ALIGN_MASK 0x7
diff --git a/drivers/net/vmxnet3/vmxnet3_drv.c b/drivers/net/vmxnet3/vmxnet3_drv.c
index edc4f23d4965..93f237db463d 100644
--- a/drivers/net/vmxnet3/vmxnet3_drv.c
+++ b/drivers/net/vmxnet3/vmxnet3_drv.c
@@ -1207,7 +1207,7 @@ vmxnet3_tq_xmit(struct sk_buff *skb, struct vmxnet3_tx_queue *tq,
if (tx_num_deferred >= le32_to_cpu(tq->shared->txThreshold)) {
tq->shared->txNumDeferred = 0;
VMXNET3_WRITE_BAR0_REG(adapter,
- VMXNET3_REG_TXPROD + tq->qid * 8,
+ adapter->tx_prod_offset + tq->qid * 8,
tq->tx_ring.next2fill);
}

@@ -1359,8 +1359,8 @@ static int
vmxnet3_rq_rx_complete(struct vmxnet3_rx_queue *rq,
struct vmxnet3_adapter *adapter, int quota)
{
- static const u32 rxprod_reg[2] = {
- VMXNET3_REG_RXPROD, VMXNET3_REG_RXPROD2
+ u32 rxprod_reg[2] = {
+ adapter->rx_prod_offset, adapter->rx_prod2_offset
};
u32 num_pkts = 0;
bool skip_page_frags = false;
@@ -2783,9 +2783,9 @@ vmxnet3_activate_dev(struct vmxnet3_adapter *adapter)

for (i = 0; i < adapter->num_rx_queues; i++) {
VMXNET3_WRITE_BAR0_REG(adapter,
- VMXNET3_REG_RXPROD + i * VMXNET3_REG_ALIGN,
+ adapter->rx_prod_offset + i * VMXNET3_REG_ALIGN,
adapter->rx_queue[i].rx_ring[0].next2fill);
- VMXNET3_WRITE_BAR0_REG(adapter, (VMXNET3_REG_RXPROD2 +
+ VMXNET3_WRITE_BAR0_REG(adapter, (adapter->rx_prod2_offset +
(i * VMXNET3_REG_ALIGN)),
adapter->rx_queue[i].rx_ring[1].next2fill);
}
@@ -3608,6 +3608,10 @@ vmxnet3_probe_device(struct pci_dev *pdev,
if (VMXNET3_VERSION_GE_7(adapter)) {
adapter->devcap_supported[0] = VMXNET3_READ_BAR1_REG(adapter, VMXNET3_REG_DCR);
adapter->ptcap_supported[0] = VMXNET3_READ_BAR1_REG(adapter, VMXNET3_REG_PTCR);
+ if (adapter->devcap_supported[0] & (1UL << VMXNET3_CAP_LARGE_BAR)) {
+ adapter->dev_caps[0] = adapter->devcap_supported[0] &
+ (1UL << VMXNET3_CAP_LARGE_BAR);
+ }
if (adapter->dev_caps[0])
VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_DCR, adapter->dev_caps[0]);

@@ -3617,6 +3621,17 @@ vmxnet3_probe_device(struct pci_dev *pdev,
spin_unlock_irqrestore(&adapter->cmd_lock, flags);
}

+ if (VMXNET3_VERSION_GE_7(adapter) &&
+ adapter->dev_caps[0] & (1UL << VMXNET3_CAP_LARGE_BAR)) {
+ adapter->tx_prod_offset = VMXNET3_REG_LB_TXPROD;
+ adapter->rx_prod_offset = VMXNET3_REG_LB_RXPROD;
+ adapter->rx_prod2_offset = VMXNET3_REG_LB_RXPROD2;
+ } else {
+ adapter->tx_prod_offset = VMXNET3_REG_TXPROD;
+ adapter->rx_prod_offset = VMXNET3_REG_RXPROD;
+ adapter->rx_prod2_offset = VMXNET3_REG_RXPROD2;
+ }
+
if (VMXNET3_VERSION_GE_6(adapter)) {
spin_lock_irqsave(&adapter->cmd_lock, flags);
VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_CMD,
diff --git a/drivers/net/vmxnet3/vmxnet3_ethtool.c b/drivers/net/vmxnet3/vmxnet3_ethtool.c
index 458f2da1ebab..397b268f7bc5 100644
--- a/drivers/net/vmxnet3/vmxnet3_ethtool.c
+++ b/drivers/net/vmxnet3/vmxnet3_ethtool.c
@@ -520,7 +520,7 @@ vmxnet3_get_regs(struct net_device *netdev, struct ethtool_regs *regs, void *p)
for (i = 0; i < adapter->num_tx_queues; i++) {
struct vmxnet3_tx_queue *tq = &adapter->tx_queue[i];

- buf[j++] = VMXNET3_READ_BAR0_REG(adapter, VMXNET3_REG_TXPROD +
+ buf[j++] = VMXNET3_READ_BAR0_REG(adapter, adapter->tx_prod_offset +
i * VMXNET3_REG_ALIGN);

buf[j++] = VMXNET3_GET_ADDR_LO(tq->tx_ring.basePA);
@@ -548,9 +548,9 @@ vmxnet3_get_regs(struct net_device *netdev, struct ethtool_regs *regs, void *p)
for (i = 0; i < adapter->num_rx_queues; i++) {
struct vmxnet3_rx_queue *rq = &adapter->rx_queue[i];

- buf[j++] = VMXNET3_READ_BAR0_REG(adapter, VMXNET3_REG_RXPROD +
+ buf[j++] = VMXNET3_READ_BAR0_REG(adapter, adapter->rx_prod_offset +
i * VMXNET3_REG_ALIGN);
- buf[j++] = VMXNET3_READ_BAR0_REG(adapter, VMXNET3_REG_RXPROD2 +
+ buf[j++] = VMXNET3_READ_BAR0_REG(adapter, adapter->rx_prod2_offset +
i * VMXNET3_REG_ALIGN);

buf[j++] = VMXNET3_GET_ADDR_LO(rq->rx_ring[0].basePA);
diff --git a/drivers/net/vmxnet3/vmxnet3_int.h b/drivers/net/vmxnet3/vmxnet3_int.h
index a7c8f80702c2..a4f832f0ad5b 100644
--- a/drivers/net/vmxnet3/vmxnet3_int.h
+++ b/drivers/net/vmxnet3/vmxnet3_int.h
@@ -406,6 +406,9 @@ struct vmxnet3_adapter {
u32 devcap_supported[8];
u32 ptcap_supported[8];
u32 dev_caps[8];
+ u16 tx_prod_offset;
+ u16 rx_prod_offset;
+ u16 rx_prod2_offset;
};

#define VMXNET3_WRITE_BAR0_REG(adapter, reg, val) \
--
2.11.0