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vmxnet3: avoid xmit reset due to a race in vmxnet3 

The field txNumDeferred is used by the driver to keep track of the number
of packets it has pushed to the emulation. The driver increments it on
pushing the packet to the emulation and the emulation resets it to 0 at
the end of the transmit.

There is a possibility of a race either when (a) ESX is under heavy load or
(b) workload inside VM is of low packet rate.

This race results in xmit hangs when network coalescing is disabled. This
change creates a local copy of txNumDeferred and uses it to perform ring
arithmetic.

Reported-by: Noriho Tanaka <ntanaka@vmware.com>
Signed-off-by: Ronak Doshi <doshir@vmware.com>
Acked-by: Shrikrishna Khare <skhare@vmware.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ronak Doshi 2018-03-16 14:47:54 -07:00 committed by David S. Miller
parent 78f1b04fa2
commit 7a4c003d69
2 changed files with 10 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/net/vmxnet3/vmxnet3_drv.c
View File

@ -977,6 +977,8 @@ vmxnet3_tq_xmit(struct sk_buff *skb, struct vmxnet3_tx_queue *tq,
{
int ret;
u32 count;
int num_pkts;
int tx_num_deferred;
unsigned long flags;
struct vmxnet3_tx_ctx ctx;
union Vmxnet3_GenericDesc *gdesc;
@ -1075,12 +1077,12 @@ vmxnet3_tq_xmit(struct sk_buff *skb, struct vmxnet3_tx_queue *tq,
#else
gdesc = ctx.sop_txd;
#endif
tx_num_deferred = le32_to_cpu(tq->shared->txNumDeferred);
if (ctx.mss) {
gdesc->txd.hlen = ctx.eth_ip_hdr_size + ctx.l4_hdr_size;
gdesc->txd.om = VMXNET3_OM_TSO;
gdesc->txd.msscof = ctx.mss;
le32_add_cpu(&tq->shared->txNumDeferred, (skb->len -
gdesc->txd.hlen + ctx.mss - 1) / ctx.mss);
num_pkts = (skb->len - gdesc->txd.hlen + ctx.mss - 1) / ctx.mss;
} else {
if (skb->ip_summed == CHECKSUM_PARTIAL) {
gdesc->txd.hlen = ctx.eth_ip_hdr_size;
@ -1091,8 +1093,10 @@ vmxnet3_tq_xmit(struct sk_buff *skb, struct vmxnet3_tx_queue *tq,
gdesc->txd.om = 0;
gdesc->txd.msscof = 0;
}
le32_add_cpu(&tq->shared->txNumDeferred, 1);
num_pkts = 1;
}
le32_add_cpu(&tq->shared->txNumDeferred, num_pkts);
tx_num_deferred += num_pkts;
if (skb_vlan_tag_present(skb)) {
gdesc->txd.ti = 1;
@ -1118,8 +1122,7 @@ vmxnet3_tq_xmit(struct sk_buff *skb, struct vmxnet3_tx_queue *tq,
spin_unlock_irqrestore(&tq->tx_lock, flags);
if (le32_to_cpu(tq->shared->txNumDeferred) >=
le32_to_cpu(tq->shared->txThreshold)) {
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,

4
drivers/net/vmxnet3/vmxnet3_int.h
View File

@ -69,10 +69,10 @@
/*
* Version numbers
*/
#define VMXNET3_DRIVER_VERSION_STRING "1.4.11.0-k"
#define VMXNET3_DRIVER_VERSION_STRING "1.4.12.0-k"
/* a 32-bit int, each byte encode a verion number in VMXNET3_DRIVER_VERSION */
#define VMXNET3_DRIVER_VERSION_NUM 0x01040b00
#define VMXNET3_DRIVER_VERSION_NUM 0x01040c00
#if defined(CONFIG_PCI_MSI)
/* RSS only makes sense if MSI-X is supported. */