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 <w-kw...@ti.com>
Cc: Mugunthan V N <mugunthan...@ti.com>
CC: Arnd Bergmann <a...@arndb.de>
CC: Grygorii Strashko <grygorii.stras...@ti.com>
CC: David Laight <david.lai...@aculab.com>
Signed-off-by: Murali Karicheri <m-kariche...@ti.com>
---
v1 - new patch based on discussion at
https://patchwork.ozlabs.org/patch/580860/
drivers/net/ethernet/ti/netcp_core.c | 43 ++++++++++++++++++++++--------------
1 file changed, 27 insertions(+), 16 deletions(-)
diff --git a/drivers/net/ethernet/ti/netcp_core.c
b/drivers/net/ethernet/ti/netcp_core.c
index 1d07cca..8b353e4 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 +593,14 @@ 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);
+ 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);
+ 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 +640,6 @@ 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 +652,8 @@ 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);
+ 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 +686,7 @@ 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);
+ 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 +764,6 @@ 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 +774,7 @@ 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);
+ buf_ptr = (void *)GET_SW_DATA0(desc);
if (unlikely(!dma)) {
dev_err(netcp->ndev_dev, "NULL orig_buff in desc\n");
@@ -865,7 +876,8 @@ 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 +970,6 @@ 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 +982,7 @@ static int netcp_process_tx_compl_packets(struct netcp_intf
*netcp,
continue;
}
- get_sw_data((u32 *)&skb, &tmp, desc);
+ 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");
--
1.9.1
