From mboxrd@z Thu Jan 1 00:00:00 1970 From: Haiyang Zhang Subject: [PATCH net, 3/3] hyperv: Fix page buffer handling in rndis_filter_send_request() Date: Mon, 1 Oct 2012 15:30:57 -0700 Message-ID: <1349130657-7987-3-git-send-email-haiyangz@microsoft.com> References: <1349130657-7987-1-git-send-email-haiyangz@microsoft.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: olaf@aepfle.de, jasowang@redhat.com, linux-kernel@vger.kernel.org, devel@linuxdriverproject.org, haiyangz@microsoft.com To: davem@davemloft.net, netdev@vger.kernel.org Return-path: In-Reply-To: <1349130657-7987-1-git-send-email-haiyangz@microsoft.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: devel-bounces@linuxdriverproject.org Sender: "devel" List-Id: netdev.vger.kernel.org Add another page buffer if the request message crossed page boundary. Signed-off-by: Haiyang Zhang Reviewed-by: K. Y. Srinivasan --- drivers/net/hyperv/rndis_filter.c | 16 +++++++++++++++- 1 files changed, 15 insertions(+), 1 deletions(-) diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c index 2909dd8..1cd8d45 100644 --- a/drivers/net/hyperv/rndis_filter.c +++ b/drivers/net/hyperv/rndis_filter.c @@ -45,7 +45,9 @@ struct rndis_request { /* Simplify allocation by having a netvsc packet inline */ struct hv_netvsc_packet pkt; - struct hv_page_buffer buf; + /* Set 2 pages for rndis requests crossing page boundary */ + struct hv_page_buffer buf[2]; + /* FIXME: We assumed a fixed size request here. */ struct rndis_message request_msg; u8 ext[100]; @@ -221,6 +223,18 @@ static int rndis_filter_send_request(struct rndis_device *dev, packet->page_buf[0].offset = (unsigned long)&req->request_msg & (PAGE_SIZE - 1); + /* Add one page_buf when request_msg crossing page boundary */ + if (packet->page_buf[0].offset + packet->page_buf[0].len > PAGE_SIZE) { + packet->page_buf_cnt++; + packet->page_buf[0].len = PAGE_SIZE - + packet->page_buf[0].offset; + packet->page_buf[1].pfn = virt_to_phys((void *)&req->request_msg + + packet->page_buf[0].len) >> PAGE_SHIFT; + packet->page_buf[1].offset = 0; + packet->page_buf[1].len = req->request_msg.msg_len - + packet->page_buf[0].len; + } + packet->completion.send.send_completion_ctx = req;/* packet; */ packet->completion.send.send_completion = rndis_filter_send_request_completion; -- 1.7.4.1