[PATCH net-next 6/6] hv_netvsc: empty current transmit aggregation if flow blocked
flat view
STALE3233d
From: Stephen Hemminger <stephen@networkplumber.org>
Date: 2017-12-13 00:48:51
Subsystem:
hyper-v/azure core and drivers, networking drivers, the rest · Maintainers:
Haiyang Zhang, Wei Liu, Dexuan Cui, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
If the transmit queue is known full, then don't keep aggregating data. And the cp_partial flag which indicates that the current aggregation buffer is full can be folded in to avoid more conditionals. Signed-off-by: Stephen Hemminger <redacted> --- drivers/net/hyperv/hyperv_net.h | 2 +- drivers/net/hyperv/netvsc.c | 20 ++++++++++++++------ drivers/net/hyperv/netvsc_drv.c | 2 +- drivers/net/hyperv/rndis_filter.c | 3 +-- 4 files changed, 17 insertions(+), 10 deletions(-)
diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index 8ebe72bf89ff..c46ecd8cb7cd 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h@@ -194,7 +194,7 @@ struct netvsc_device *netvsc_device_add(struct hv_device *device, const struct netvsc_device_info *info); int netvsc_alloc_recv_comp_ring(struct netvsc_device *net_device, u32 q_idx); void netvsc_device_remove(struct hv_device *device); -int netvsc_send(struct net_device_context *ndc, +int netvsc_send(struct net_device *net, struct hv_netvsc_packet *packet, struct rndis_message *rndis_msg, struct hv_page_buffer *page_buffer,
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 6dd97f232f87..66cfd0eb3434 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c@@ -702,7 +702,7 @@ static void netvsc_copy_to_send_buf(struct netvsc_device *net_device, struct hv_netvsc_packet *packet, struct rndis_message *rndis_msg, struct hv_page_buffer *pb, - struct sk_buff *skb) + bool xmit_more) { char *start = net_device->send_buf; char *dest = start + (section_index * net_device->send_section_size)
@@ -715,7 +715,7 @@ static void netvsc_copy_to_send_buf(struct netvsc_device *net_device, /* Add padding */ remain = packet->total_data_buflen & (net_device->pkt_align - 1); - if (skb->xmit_more && remain && !packet->cp_partial) { + if (xmit_more && remain) { padding = net_device->pkt_align - remain; rndis_msg->msg_len += padding; packet->total_data_buflen += padding;
@@ -824,12 +824,13 @@ static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send, } /* RCU already held by caller */ -int netvsc_send(struct net_device_context *ndev_ctx, +int netvsc_send(struct net_device *ndev, struct hv_netvsc_packet *packet, struct rndis_message *rndis_msg, struct hv_page_buffer *pb, struct sk_buff *skb) { + struct net_device_context *ndev_ctx = netdev_priv(ndev); struct netvsc_device *net_device = rcu_dereference_bh(ndev_ctx->nvdev); struct hv_device *device = ndev_ctx->device_ctx;
@@ -840,7 +841,7 @@ int netvsc_send(struct net_device_context *ndev_ctx, struct multi_send_data *msdp; struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL; struct sk_buff *msd_skb = NULL; - bool try_batch; + bool try_batch, xmit_more; /* If device is rescinded, return error and packet will get dropped. */ if (unlikely(!net_device || net_device->destroy))
@@ -891,10 +892,17 @@ int netvsc_send(struct net_device_context *ndev_ctx, } } + /* Keep aggregating only if stack says more data is coming + * and not doing mixed modes send and not flow blocked + */ + xmit_more = skb->xmit_more && + !packet->cp_partial && + !netif_xmit_stopped(netdev_get_tx_queue(ndev, packet->q_idx)); + if (section_index != NETVSC_INVALID_INDEX) { netvsc_copy_to_send_buf(net_device, section_index, msd_len, - packet, rndis_msg, pb, skb); + packet, rndis_msg, pb, xmit_more); packet->send_buf_index = section_index;
@@ -914,7 +922,7 @@ int netvsc_send(struct net_device_context *ndev_ctx, if (msdp->skb) dev_consume_skb_any(msdp->skb); - if (skb->xmit_more && !packet->cp_partial) { + if (xmit_more) { msdp->skb = skb; msdp->pkt = packet; msdp->count++;
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 36091ed570e2..3737c1fefb04 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c@@ -630,7 +630,7 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net) /* timestamp packet in software */ skb_tx_timestamp(skb); - ret = netvsc_send(net_device_ctx, packet, rndis_msg, pb, skb); + ret = netvsc_send(net, packet, rndis_msg, pb, skb); if (likely(ret == 0)) return NETDEV_TX_OK;
diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
index 035976949177..91a67c5297f7 100644
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c@@ -215,7 +215,6 @@ static int rndis_filter_send_request(struct rndis_device *dev, struct hv_netvsc_packet *packet; struct hv_page_buffer page_buf[2]; struct hv_page_buffer *pb = page_buf; - struct net_device_context *net_device_ctx = netdev_priv(dev->ndev); int ret; /* Setup the packet to send it */
@@ -243,7 +242,7 @@ static int rndis_filter_send_request(struct rndis_device *dev, } rcu_read_lock_bh(); - ret = netvsc_send(net_device_ctx, packet, NULL, pb, NULL); + ret = netvsc_send(dev->ndev, packet, NULL, pb, NULL); rcu_read_unlock_bh(); return ret;
--
2.11.0