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Commit 06324481 authored by Karicheri, Muralidharan's avatar Karicheri, Muralidharan Committed by David S. Miller
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net: netcp: rework the code for get/set sw_data in dma desc 

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-kwok2@ti.com>
Cc: Mugunthan V N <mugunthanvnm@ti.com>
CC: Arnd Bergmann <arnd@arndb.de>
CC: Grygorii Strashko <grygorii.strashko@ti.com>
CC: David Laight <David.Laight@ACULAB.COM>
Signed-off-by: default avatarMurali Karicheri <m-karicheri2@ti.com>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b1cb86ae
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Showing with 55 additions and 17 deletions
drivers/net/ethernet/ti/netcp_core.c
View file @ 06324481
......@@ -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;
......
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