[PATCH net-next V2 11/11] vhost_net: batch submitting XDP buffers to underlayer sockets

This patch implements XDP batching for vhost_net. The idea is first to try to do userspace copy and build XDP buff directly in vhost. Instead of submitting the packet immediately, vhost_net will batch them in an array and submit every 64 (VHOST_NET_BATCH) packets to the under layer sockets through

[PATCH net-next V2 10/11] tap: accept an array of XDP buffs through sendmsg()

This patch implement TUN_MSG_PTR msg_control type. This type allows the caller to pass an array of XDP buffs to tuntap through ptr field of the tun_msg_control. Tap will build skb through those XDP buffers. This will avoid lots of indirect calls thus improves the icache utilization and allows to d

[PATCH net-next V2 09/11] tuntap: accept an array of XDP buffs through sendmsg()

This patch implement TUN_MSG_PTR msg_control type. This type allows the caller to pass an array of XDP buffs to tuntap through ptr field of the tun_msg_control. If an XDP program is attached, tuntap can run XDP program directly. If not, tuntap will build skb and do a fast receiving since part of th

[PATCH net-next V2 08/11] tun: switch to new type of msg_control

This patch introduces to a new tun/tap specific msg_control: #define TUN_MSG_UBUF 1 #define TUN_MSG_PTR 2 struct tun_msg_ctl { int type; void *ptr; }; This allows us to pass different kinds of msg_control through sendmsg(). The first supported type is ubuf (TUN_MSG_UBUF) which will

[PATCH net-next V2 07/11] tuntap: move XDP flushing out of tun_do_xdp()

This will allow adding batch flushing on top. Signed-off-by: Jason Wang --- drivers/net/tun.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/tun.c b/drivers/net/tun.c index 14fe94098180..3ae539374f6b 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -16

[PATCH net-next V2 06/11] tuntap: split out XDP logic

This patch split out XDP logic into a single function. This make it to be reused by XDP batching path in the following patch. Signed-off-by: Jason Wang --- drivers/net/tun.c | 88 +++ 1 file changed, 51 insertions(+), 37 deletions(-) diff --git a/driv

[PATCH net-next V2 05/11] tuntap: tweak on the path of skb XDP case in tun_build_skb()

If we're sure not to go native XDP, there's no need for several things like bh and rcu stuffs. So this patch introduces a helper to build skb and hold page refcnt. When we found we will go through skb path, build skb directly. Signed-off-by: Jason Wang --- drivers/net/tun.c | 39

[PATCH net-next V2 04/11] tuntap: simplify error handling in tun_build_skb()

There's no need to duplicate page get logic in each action. So this patch tries to get page and calculate the offset before processing XDP actions (except for XDP_DROP), and undo them when meet errors (we don't care the performance on errors). This will be used for factoring out XDP logic. Signed-

[PATCH net-next V2 03/11] tuntap: enable bh early during processing XDP

This patch move the bh enabling a little bit earlier, this will be used for factoring out the core XDP logic of tuntap. Acked-by: Michael S. Tsirkin Signed-off-by: Jason Wang --- drivers/net/tun.c | 10 +++--- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/drivers/net/tun.c b

[PATCH net-next V2 02/11] tuntap: switch to use XDP_PACKET_HEADROOM

Acked-by: Michael S. Tsirkin Signed-off-by: Jason Wang --- drivers/net/tun.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/net/tun.c b/drivers/net/tun.c index 2c548bd20393..d3677a544b56 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -113,7 +113,6 @@ do

[PATCH net-next V2 00/11] vhost_net TX batching

Hi all: This series tries to batch submitting packets to underlayer socket through msg_control during sendmsg(). This is done by: 1) Doing userspace copy inside vhost_net 2) Build XDP buff 3) Batch at most 64 (VHOST_NET_BATCH) XDP buffs and submit them once through msg_control during sendmsg()

[PATCH net-next V2 01/11] net: sock: introduce SOCK_XDP

This patch introduces a new sock flag - SOCK_XDP. This will be used for notifying the upper layer that XDP program is attached on the lower socket, and requires for extra headroom. TUN will be the first user. Signed-off-by: Jason Wang --- drivers/net/tun.c | 19 +++ include/net

Re: [PATCH v2] x86/paravirt: Cleanup native_patch()

On 11/09/18 11:15, Borislav Petkov wrote: > When CONFIG_PARAVIRT_SPINLOCKS=n, it fires > > arch/x86/kernel/paravirt_patch_64.c: In function ‘native_patch’: > arch/x86/kernel/paravirt_patch_64.c:89:1: warning: label ‘patch_site’ > defined but not used [-Wunused-label] >patch_site: > > but

[PATCH v2] x86/paravirt: Cleanup native_patch()

When CONFIG_PARAVIRT_SPINLOCKS=n, it fires arch/x86/kernel/paravirt_patch_64.c: In function ‘native_patch’: arch/x86/kernel/paravirt_patch_64.c:89:1: warning: label ‘patch_site’ defined but not used [-Wunused-label] patch_site: but those labels can simply be removed by directly calling th