From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gregory Haskins Subject: [NET PATCH 4/9] venet: report actual used descriptor size Date: Wed, 14 Oct 2009 11:59:07 -0400 Message-ID: <20091014155906.18864.23409.stgit@dev.haskins.net> References: <20091014154457.18864.28382.stgit@dev.haskins.net> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org To: alacrityvm-devel@lists.sourceforge.net Return-path: In-Reply-To: <20091014154457.18864.28382.stgit@dev.haskins.net> Sender: netdev-owner@vger.kernel.org List-ID: This should reduce wasted effort copying parts of the descriptor which are not in use, since the descriptors are typically pre-allocated to their maximum size. Signed-off-by: Gregory Haskins --- drivers/net/vbus-enet.c | 2 ++ include/linux/venet.h | 3 +++ 2 files changed, 5 insertions(+), 0 deletions(-) diff --git a/drivers/net/vbus-enet.c b/drivers/net/vbus-enet.c index b3e9695..63237f3 100644 --- a/drivers/net/vbus-enet.c +++ b/drivers/net/vbus-enet.c @@ -582,6 +582,8 @@ vbus_enet_tx_start(struct sk_buff *skb, struct net_device *dev) iov->ptr = (u64)sg_phys(sg); } + iter.desc->len = (u64)VSG_DESC_SIZE(vsg->count); + } else { /* * non scatter-gather mode: simply put the skb right onto the diff --git a/include/linux/venet.h b/include/linux/venet.h index 57aeddd..53b6958 100644 --- a/include/linux/venet.h +++ b/include/linux/venet.h @@ -76,6 +76,9 @@ struct venet_sg { struct venet_iov iov[1]; }; +#define VSG_DESC_SIZE(count) (sizeof(struct venet_sg) + \ + sizeof(struct venet_iov) * ((count) - 1)) + #define VENET_FUNC_LINKUP 0 #define VENET_FUNC_LINKDOWN 1 #define VENET_FUNC_MACQUERY 2