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| author |   David L Stevens <david.stevens@oracle.com> | 2014-09-29 19:48:11 -0400 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2014-09-30 17:10:39 -0400 |
| commit | 8e845f4cbbd2ef81846c2ab5dca46d88fb2717ee (patch) | |
| tree | 59f30a451145d5e95bf308c4b06cacb61a996417 /drivers/net/ethernet/sun/sunvnet.h | |
| parent | sunvnet: upgrade to VIO protocol version 1.6 (diff) | |
| download | linux-dev-8e845f4cbbd2ef81846c2ab5dca46d88fb2717ee.tar.xz linux-dev-8e845f4cbbd2ef81846c2ab5dca46d88fb2717ee.zip | |
sunvnet: make transmit path zero-copy in the kernel
This patch removes pre-allocated transmit buffers and instead directly maps
pending packets on demand. This saves O(n^2) maximum-sized transmit buffers,
for n hosts on a vswitch, as well as a copy to those buffers.
Single-stream TCP throughput linux-solaris dropped ~5% for 1500-byte MTU,
but linux-linux at 1500-bytes increased ~20%.
Signed-off-by: David L Stevens <david.stevens@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/sun/sunvnet.h')
| -rw-r--r-- | drivers/net/ethernet/sun/sunvnet.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/net/ethernet/sun/sunvnet.h b/drivers/net/ethernet/sun/sunvnet.h index 986e04b9313d..02f507db9951 100644 --- a/drivers/net/ethernet/sun/sunvnet.h +++ b/drivers/net/ethernet/sun/sunvnet.h @@ -11,6 +11,11 @@ */ #define VNET_TX_TIMEOUT (5 * HZ) +/* length of time (or less) we expect pending descriptors to be marked + * as VIO_DESC_DONE and skbs ready to be freed + */ +#define VNET_CLEAN_TIMEOUT ((HZ/100)+1) + #define VNET_MAXPACKET 1518ULL /* ETH_FRAMELEN + VLAN_HDR */ #define VNET_TX_RING_SIZE 512 #define VNET_TX_WAKEUP_THRESH(dr) ((dr)->pending / 4) @@ -22,7 +27,7 @@ #define VNET_PACKET_SKIP 6 struct vnet_tx_entry { - void *buf; + struct sk_buff *skb; unsigned int ncookies; struct ldc_trans_cookie cookies[2]; }; @@ -46,6 +51,8 @@ struct vnet_port { bool stop_rx; bool start_cons; + struct timer_list clean_timer; + u64 rmtu; }; |