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Commit d3e17183 authored by David S. Miller's avatar David S. Miller
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Merge branch 'netcp-fixes' 

Murali Karicheri says:

====================
net: ti: netcp: restore get/set_pad_info() functionality

This series fixes a regression and add some improvements for the ease
of maintainance. Incorporated comments against v1.

Changelogs:

 v2 : combined 2-3 into one patch as this involves a header change
      fixed a parse warning in 3/4 per comment from Arnd.
      Removed Sign-off from Arnd against 1/4
      added comments in 3/3 to alert on the usage of sw data per review
      comments
 v1 : added 2-4 to accomodate feedback received from review
 v0 : initial version to fix the regression (From Grygorii)
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents 3301be32 06324481
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Showing with 64 additions and 45 deletions
drivers/net/ethernet/ti/netcp_core.c
View file @ d3e17183
......@@ -117,21 +117,17 @@ 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_pad_info(u32 *pad0, u32 *pad1, u32 *pad2, struct knav_dma_desc *desc)
static u32 get_sw_data(int index, struct knav_dma_desc *desc)
{
*pad0 = le32_to_cpu(desc->pad[0]);
*pad1 = le32_to_cpu(desc->pad[1]);
*pad2 = le32_to_cpu(desc->pad[2]);
/* No Endian conversion needed as this data is untouched by hw */
return desc->sw_data[index];
}
static void get_pad_ptr(void **padptr, struct knav_dma_desc *desc)
{
u64 pad64;
pad64 = le32_to_cpu(desc->pad[0]) +
((u64)le32_to_cpu(desc->pad[1]) << 32);
*padptr = (void *)(uintptr_t)pad64;
}
/* 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)
......@@ -163,13 +159,18 @@ static void set_desc_info(u32 desc_info, u32 pkt_info,
desc->packet_info = cpu_to_le32(pkt_info);
}
static void set_pad_info(u32 pad0, u32 pad1, u32 pad2, struct knav_dma_desc *desc)
static void set_sw_data(int index, u32 data, struct knav_dma_desc *desc)
{
desc->pad[0] = cpu_to_le32(pad0);
desc->pad[1] = cpu_to_le32(pad1);
desc->pad[2] = cpu_to_le32(pad1);
/* No Endian conversion needed as this data is untouched by hw */
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)
{
......@@ -581,7 +582,6 @@ static void netcp_free_rx_desc_chain(struct netcp_intf *netcp,
dma_addr_t dma_desc, dma_buf;
unsigned int buf_len, dma_sz = sizeof(*ndesc);
void *buf_ptr;
u32 pad[2];
u32 tmp;
get_words(&dma_desc, 1, &desc->next_desc);
......@@ -593,14 +593,20 @@ static void netcp_free_rx_desc_chain(struct netcp_intf *netcp,
break;
}
get_pkt_info(&dma_buf, &tmp, &dma_desc, ndesc);
get_pad_ptr(&buf_ptr, 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_pad_info(&pad[0], &pad[1], &buf_len, desc);
buf_ptr = (void *)(uintptr_t)(pad[0] + ((u64)pad[1] << 32));
/* 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);
......@@ -639,7 +645,6 @@ static int netcp_process_one_rx_packet(struct netcp_intf *netcp)
dma_addr_t dma_desc, dma_buff;
struct netcp_packet p_info;
struct sk_buff *skb;
u32 pad[2];
void *org_buf_ptr;
dma_desc = knav_queue_pop(netcp->rx_queue, &dma_sz);
......@@ -653,8 +658,11 @@ static int netcp_process_one_rx_packet(struct netcp_intf *netcp)
}
get_pkt_info(&dma_buff, &buf_len, &dma_desc, desc);
get_pad_info(&pad[0], &pad[1], &org_buf_len, desc);
org_buf_ptr = (void *)(uintptr_t)(pad[0] + ((u64)pad[1] << 32));
/* 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");
......@@ -679,7 +687,6 @@ static int netcp_process_one_rx_packet(struct netcp_intf *netcp)
/* Fill in the page fragment list */
while (dma_desc) {
struct page *page;
void *ptr;
ndesc = knav_pool_desc_unmap(netcp->rx_pool, dma_desc, dma_sz);
if (unlikely(!ndesc)) {
......@@ -688,8 +695,10 @@ static int netcp_process_one_rx_packet(struct netcp_intf *netcp)
}
get_pkt_info(&dma_buff, &buf_len, &dma_desc, ndesc);
get_pad_ptr(&ptr, ndesc);
page = ptr;
/* 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,
......@@ -777,7 +786,10 @@ static void netcp_free_rx_buf(struct netcp_intf *netcp, int fdq)
}
get_org_pkt_info(&dma, &buf_len, desc);
get_pad_ptr(&buf_ptr, 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");
......@@ -829,7 +841,7 @@ static int netcp_allocate_rx_buf(struct netcp_intf *netcp, int fdq)
struct page *page;
dma_addr_t dma;
void *bufptr;
u32 pad[3];
u32 sw_data[2];
/* Allocate descriptor */
hwdesc = knav_pool_desc_get(netcp->rx_pool);
......@@ -846,7 +858,7 @@ static int netcp_allocate_rx_buf(struct netcp_intf *netcp, int fdq)
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
bufptr = netdev_alloc_frag(primary_buf_len);
pad[2] = primary_buf_len;
sw_data[1] = primary_buf_len;
if (unlikely(!bufptr)) {
dev_warn_ratelimited(netcp->ndev_dev,
......@@ -858,9 +870,10 @@ static int netcp_allocate_rx_buf(struct netcp_intf *netcp, int fdq)
if (unlikely(dma_mapping_error(netcp->dev, dma)))
goto fail;
pad[0] = lower_32_bits((uintptr_t)bufptr);
pad[1] = upper_32_bits((uintptr_t)bufptr);
/* 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 */
page = alloc_page(GFP_ATOMIC | GFP_DMA | __GFP_COLD);
......@@ -870,9 +883,11 @@ 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);
pad[0] = lower_32_bits(dma);
pad[1] = upper_32_bits(dma);
pad[2] = 0;
/* 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;
}
desc_info = KNAV_DMA_DESC_PS_INFO_IN_DESC;
......@@ -882,7 +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_pad_info(pad[0], pad[1], pad[2], 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 */
......@@ -971,7 +987,6 @@ static int netcp_process_tx_compl_packets(struct netcp_intf *netcp,
unsigned int budget)
{
struct knav_dma_desc *desc;
void *ptr;
struct sk_buff *skb;
unsigned int dma_sz;
dma_addr_t dma;
......@@ -988,8 +1003,10 @@ static int netcp_process_tx_compl_packets(struct netcp_intf *netcp,
continue;
}
get_pad_ptr(&ptr, desc);
skb = ptr;
/* 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");
......@@ -1194,10 +1211,10 @@ static int netcp_tx_submit_skb(struct netcp_intf *netcp,
}
set_words(&tmp, 1, &desc->packet_info);
tmp = lower_32_bits((uintptr_t)&skb);
set_words(&tmp, 1, &desc->pad[0]);
tmp = upper_32_bits((uintptr_t)&skb);
set_words(&tmp, 1, &desc->pad[1]);
/* 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;
......
include/linux/soc/ti/knav_dma.h
View file @ d3e17183
......@@ -44,6 +44,7 @@
#define KNAV_DMA_NUM_EPIB_WORDS 4
#define KNAV_DMA_NUM_PS_WORDS 16
#define KNAV_DMA_NUM_SW_DATA_WORDS 4
#define KNAV_DMA_FDQ_PER_CHAN 4
/* Tx channel scheduling priority */
......@@ -142,6 +143,7 @@ struct knav_dma_cfg {
* @orig_buff: buff pointer since 'buff' can be overwritten
* @epib: Extended packet info block
* @psdata: Protocol specific
* @sw_data: Software private data not touched by h/w
*/
struct knav_dma_desc {
__le32 desc_info;
......@@ -154,7 +156,7 @@ struct knav_dma_desc {
__le32 orig_buff;
__le32 epib[KNAV_DMA_NUM_EPIB_WORDS];
__le32 psdata[KNAV_DMA_NUM_PS_WORDS];
__le32 pad[4];
u32 sw_data[KNAV_DMA_NUM_SW_DATA_WORDS];
} ____cacheline_aligned;
#if IS_ENABLED(CONFIG_KEYSTONE_NAVIGATOR_DMA)
......
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