From patchwork Fri Feb 19 17:58:44 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Murali Karicheri X-Patchwork-Id: 62372 Delivered-To: patch@linaro.org Received: by 10.112.43.199 with SMTP id y7csp1301548lbl; Fri, 19 Feb 2016 09:59:03 -0800 (PST) X-Received: by 10.66.62.132 with SMTP id y4mr19445369par.55.1455904742725; Fri, 19 Feb 2016 09:59:02 -0800 (PST) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id vb6si17728044pac.158.2016.02.19.09.59.02; Fri, 19 Feb 2016 09:59:02 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1428337AbcBSR6x (ORCPT + 30 others); Fri, 19 Feb 2016 12:58:53 -0500 Received: from devils.ext.ti.com ([198.47.26.153]:53756 "EHLO devils.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1428233AbcBSR6v (ORCPT ); Fri, 19 Feb 2016 12:58:51 -0500 Received: from dlelxv90.itg.ti.com ([172.17.2.17]) by devils.ext.ti.com (8.13.7/8.13.7) with ESMTP id u1JHwi0A015844; Fri, 19 Feb 2016 11:58:44 -0600 Received: from DFLE72.ent.ti.com (dfle72.ent.ti.com [128.247.5.109]) by dlelxv90.itg.ti.com (8.14.3/8.13.8) with ESMTP id u1JHwhiM004459; Fri, 19 Feb 2016 11:58:44 -0600 Received: from dlep33.itg.ti.com (157.170.170.75) by DFLE72.ent.ti.com (128.247.5.109) with Microsoft SMTP Server id 14.3.224.2; Fri, 19 Feb 2016 11:58:43 -0600 Received: from ula0868495.am.dhcp.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by dlep33.itg.ti.com (8.14.3/8.13.8) with ESMTP id u1JHwg81010860; Fri, 19 Feb 2016 11:58:43 -0600 From: Murali Karicheri To: , , , Subject: [PATCH v2 3/3] net: netcp: rework the code for get/set sw_data in dma desc Date: Fri, 19 Feb 2016 12:58:44 -0500 Message-ID: <1455904724-17952-4-git-send-email-m-karicheri2@ti.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1455904724-17952-1-git-send-email-m-karicheri2@ti.com> References: <1455904724-17952-1-git-send-email-m-karicheri2@ti.com> MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org SW data field in descriptor can be used by software to hold private data for the driver. As there are 4 words available for this purpose, use separate macros to place it or retrieve the same to/from descriptors. Also do type cast of data types accordingly. Cc: Wingman Kwok Cc: Mugunthan V N CC: Arnd Bergmann CC: Grygorii Strashko CC: David Laight Signed-off-by: Murali Karicheri --- drivers/net/ethernet/ti/netcp_core.c | 72 +++++++++++++++++++++++++++--------- 1 file changed, 55 insertions(+), 17 deletions(-) -- 1.9.1 Acked-by: Arnd Bergmann diff --git a/drivers/net/ethernet/ti/netcp_core.c b/drivers/net/ethernet/ti/netcp_core.c index 84bab29..029841f 100644 --- a/drivers/net/ethernet/ti/netcp_core.c +++ b/drivers/net/ethernet/ti/netcp_core.c @@ -117,13 +117,18 @@ static void get_pkt_info(dma_addr_t *buff, u32 *buff_len, dma_addr_t *ndesc, *ndesc = le32_to_cpu(desc->next_desc); } -static void get_sw_data(u32 *data0, u32 *data1, struct knav_dma_desc *desc) +static u32 get_sw_data(int index, struct knav_dma_desc *desc) { /* No Endian conversion needed as this data is untouched by hw */ - *data0 = desc->sw_data[0]; - *data1 = desc->sw_data[1]; + return desc->sw_data[index]; } +/* use these macros to get sw data */ +#define GET_SW_DATA0(desc) get_sw_data(0, desc) +#define GET_SW_DATA1(desc) get_sw_data(1, desc) +#define GET_SW_DATA2(desc) get_sw_data(2, desc) +#define GET_SW_DATA3(desc) get_sw_data(3, desc) + static void get_org_pkt_info(dma_addr_t *buff, u32 *buff_len, struct knav_dma_desc *desc) { @@ -154,13 +159,18 @@ static void set_desc_info(u32 desc_info, u32 pkt_info, desc->packet_info = cpu_to_le32(pkt_info); } -static void set_sw_data(u32 data0, u32 data1, struct knav_dma_desc *desc) +static void set_sw_data(int index, u32 data, struct knav_dma_desc *desc) { /* No Endian conversion needed as this data is untouched by hw */ - desc->sw_data[0] = data0; - desc->sw_data[1] = data1; + desc->sw_data[index] = data; } +/* use these macros to set sw data */ +#define SET_SW_DATA0(data, desc) set_sw_data(0, data, desc) +#define SET_SW_DATA1(data, desc) set_sw_data(1, data, desc) +#define SET_SW_DATA2(data, desc) set_sw_data(2, data, desc) +#define SET_SW_DATA3(data, desc) set_sw_data(3, data, desc) + static void set_org_pkt_info(dma_addr_t buff, u32 buff_len, struct knav_dma_desc *desc) { @@ -583,12 +593,20 @@ static void netcp_free_rx_desc_chain(struct netcp_intf *netcp, break; } get_pkt_info(&dma_buf, &tmp, &dma_desc, ndesc); - get_sw_data((u32 *)&buf_ptr, &buf_len, ndesc); + /* warning!!!! We are retrieving the virtual ptr in the sw_data + * field as a 32bit value. Will not work on 64bit machines + */ + buf_ptr = (void *)GET_SW_DATA0(ndesc); + buf_len = (int)GET_SW_DATA1(desc); dma_unmap_page(netcp->dev, dma_buf, PAGE_SIZE, DMA_FROM_DEVICE); __free_page(buf_ptr); knav_pool_desc_put(netcp->rx_pool, desc); } - get_sw_data((u32 *)&buf_ptr, &buf_len, desc); + /* warning!!!! We are retrieving the virtual ptr in the sw_data + * field as a 32bit value. Will not work on 64bit machines + */ + buf_ptr = (void *)GET_SW_DATA0(desc); + buf_len = (int)GET_SW_DATA1(desc); if (buf_ptr) netcp_frag_free(buf_len <= PAGE_SIZE, buf_ptr); @@ -628,7 +646,6 @@ static int netcp_process_one_rx_packet(struct netcp_intf *netcp) struct netcp_packet p_info; struct sk_buff *skb; void *org_buf_ptr; - u32 tmp; dma_desc = knav_queue_pop(netcp->rx_queue, &dma_sz); if (!dma_desc) @@ -641,7 +658,11 @@ static int netcp_process_one_rx_packet(struct netcp_intf *netcp) } get_pkt_info(&dma_buff, &buf_len, &dma_desc, desc); - get_sw_data((u32 *)&org_buf_ptr, &org_buf_len, desc); + /* warning!!!! We are retrieving the virtual ptr in the sw_data + * field as a 32bit value. Will not work on 64bit machines + */ + org_buf_ptr = (void *)GET_SW_DATA0(desc); + org_buf_len = (int)GET_SW_DATA1(desc); if (unlikely(!org_buf_ptr)) { dev_err(netcp->ndev_dev, "NULL bufptr in desc\n"); @@ -674,7 +695,10 @@ static int netcp_process_one_rx_packet(struct netcp_intf *netcp) } get_pkt_info(&dma_buff, &buf_len, &dma_desc, ndesc); - get_sw_data((u32 *)&page, &tmp, ndesc); + /* warning!!!! We are retrieving the virtual ptr in the sw_data + * field as a 32bit value. Will not work on 64bit machines + */ + page = (struct page *)GET_SW_DATA0(desc); if (likely(dma_buff && buf_len && page)) { dma_unmap_page(netcp->dev, dma_buff, PAGE_SIZE, @@ -752,7 +776,6 @@ static void netcp_free_rx_buf(struct netcp_intf *netcp, int fdq) unsigned int buf_len, dma_sz; dma_addr_t dma; void *buf_ptr; - u32 tmp; /* Allocate descriptor */ while ((dma = knav_queue_pop(netcp->rx_fdq[fdq], &dma_sz))) { @@ -763,7 +786,10 @@ static void netcp_free_rx_buf(struct netcp_intf *netcp, int fdq) } get_org_pkt_info(&dma, &buf_len, desc); - get_sw_data((u32 *)&buf_ptr, &tmp, desc); + /* warning!!!! We are retrieving the virtual ptr in the sw_data + * field as a 32bit value. Will not work on 64bit machines + */ + buf_ptr = (void *)GET_SW_DATA0(desc); if (unlikely(!dma)) { dev_err(netcp->ndev_dev, "NULL orig_buff in desc\n"); @@ -844,6 +870,9 @@ static int netcp_allocate_rx_buf(struct netcp_intf *netcp, int fdq) if (unlikely(dma_mapping_error(netcp->dev, dma))) goto fail; + /* warning!!!! We are saving the virtual ptr in the sw_data + * field as a 32bit value. Will not work on 64bit machines + */ sw_data[0] = (u32)bufptr; } else { /* Allocate a secondary receive queue entry */ @@ -854,6 +883,9 @@ static int netcp_allocate_rx_buf(struct netcp_intf *netcp, int fdq) } buf_len = PAGE_SIZE; dma = dma_map_page(netcp->dev, page, 0, buf_len, DMA_TO_DEVICE); + /* warning!!!! We are saving the virtual ptr in the sw_data + * field as a 32bit value. Will not work on 64bit machines + */ sw_data[0] = (u32)page; sw_data[1] = 0; } @@ -865,7 +897,8 @@ static int netcp_allocate_rx_buf(struct netcp_intf *netcp, int fdq) pkt_info |= (netcp->rx_queue_id & KNAV_DMA_DESC_RETQ_MASK) << KNAV_DMA_DESC_RETQ_SHIFT; set_org_pkt_info(dma, buf_len, hwdesc); - set_sw_data(sw_data[0], sw_data[1], hwdesc); + SET_SW_DATA0(sw_data[0], hwdesc); + SET_SW_DATA1(sw_data[1], hwdesc); set_desc_info(desc_info, pkt_info, hwdesc); /* Push to FDQs */ @@ -958,7 +991,6 @@ static int netcp_process_tx_compl_packets(struct netcp_intf *netcp, unsigned int dma_sz; dma_addr_t dma; int pkts = 0; - u32 tmp; while (budget--) { dma = knav_queue_pop(netcp->tx_compl_q, &dma_sz); @@ -971,7 +1003,10 @@ static int netcp_process_tx_compl_packets(struct netcp_intf *netcp, continue; } - get_sw_data((u32 *)&skb, &tmp, desc); + /* warning!!!! We are retrieving the virtual ptr in the sw_data + * field as a 32bit value. Will not work on 64bit machines + */ + skb = (struct sk_buff *)GET_SW_DATA0(desc); netcp_free_tx_desc_chain(netcp, desc, dma_sz); if (!skb) { dev_err(netcp->ndev_dev, "No skb in Tx desc\n"); @@ -1176,7 +1211,10 @@ static int netcp_tx_submit_skb(struct netcp_intf *netcp, } set_words(&tmp, 1, &desc->packet_info); - set_sw_data((u32)skb, 0, desc); + /* warning!!!! We are saving the virtual ptr in the sw_data + * field as a 32bit value. Will not work on 64bit machines + */ + SET_SW_DATA0((u32)skb, desc); if (tx_pipe->flags & SWITCH_TO_PORT_IN_TAGINFO) { tmp = tx_pipe->switch_to_port;