netcp: try to reduce type confusion in descriptors
The netcp driver produces tons of warnings when CONFIG_LPAE is enabled on ARM: drivers/net/ethernet/ti/netcp_core.c: In function 'netcp_tx_map_skb': drivers/net/ethernet/ti/netcp_core.c:1084:13: warning: passing argument 1 of 'set_words' from incompatible pointer type [-Wincompatible-pointer-types] This is the result of trying to pass a pointer to a dma_addr_t to a function that expects a u32 pointer to copy that into a DMA descriptor. Looking at that code in more detail to fix the warnings, I see multiple related problems: * The conversion functions are not endian-safe, as the DMA descriptors are almost certainly fixed-endian, but the CPU is not. * On 64-bit machines, passing a pointer through a u32 variable is a bug, accessing an indirect pointer as a u32 pointer even more so. * The handling of epib and psdata mixes native-endian and device-endian data. In this patch, I try to sort out the types for most accesses here, adding le32_to_cpu/cpu_to_le32 where appropriate, and passing pointers through two 32-bit words in the descriptor padding, to make it plausible that the driver does the right thing if compiled for big-endian or 64-bit systems. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Родитель
ad2c8c73d2
Коммит
8990777914
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@ -109,69 +109,80 @@ module_param(netcp_debug_level, int, 0);
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MODULE_PARM_DESC(netcp_debug_level, "Netcp debug level (NETIF_MSG bits) (0=none,...,16=all)");
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/* Helper functions - Get/Set */
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static void get_pkt_info(u32 *buff, u32 *buff_len, u32 *ndesc,
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static void get_pkt_info(dma_addr_t *buff, u32 *buff_len, dma_addr_t *ndesc,
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struct knav_dma_desc *desc)
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{
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*buff_len = desc->buff_len;
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*buff = desc->buff;
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*ndesc = desc->next_desc;
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*buff_len = le32_to_cpu(desc->buff_len);
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*buff = le32_to_cpu(desc->buff);
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*ndesc = le32_to_cpu(desc->next_desc);
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}
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static void get_pad_info(u32 *pad0, u32 *pad1, struct knav_dma_desc *desc)
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static void get_pad_info(u32 *pad0, u32 *pad1, u32 *pad2, struct knav_dma_desc *desc)
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{
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*pad0 = desc->pad[0];
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*pad1 = desc->pad[1];
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*pad0 = le32_to_cpu(desc->pad[0]);
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*pad1 = le32_to_cpu(desc->pad[1]);
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*pad2 = le32_to_cpu(desc->pad[2]);
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}
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static void get_org_pkt_info(u32 *buff, u32 *buff_len,
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static void get_pad_ptr(void **padptr, struct knav_dma_desc *desc)
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{
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u64 pad64;
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pad64 = le32_to_cpu(desc->pad[0]) +
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((u64)le32_to_cpu(desc->pad[1]) << 32);
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*padptr = (void *)(uintptr_t)pad64;
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}
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static void get_org_pkt_info(dma_addr_t *buff, u32 *buff_len,
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struct knav_dma_desc *desc)
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{
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*buff = desc->orig_buff;
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*buff_len = desc->orig_len;
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*buff = le32_to_cpu(desc->orig_buff);
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*buff_len = le32_to_cpu(desc->orig_len);
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}
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static void get_words(u32 *words, int num_words, u32 *desc)
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static void get_words(dma_addr_t *words, int num_words, __le32 *desc)
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{
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int i;
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for (i = 0; i < num_words; i++)
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words[i] = desc[i];
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words[i] = le32_to_cpu(desc[i]);
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}
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static void set_pkt_info(u32 buff, u32 buff_len, u32 ndesc,
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static void set_pkt_info(dma_addr_t buff, u32 buff_len, u32 ndesc,
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struct knav_dma_desc *desc)
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{
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desc->buff_len = buff_len;
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desc->buff = buff;
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desc->next_desc = ndesc;
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desc->buff_len = cpu_to_le32(buff_len);
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desc->buff = cpu_to_le32(buff);
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desc->next_desc = cpu_to_le32(ndesc);
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}
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static void set_desc_info(u32 desc_info, u32 pkt_info,
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struct knav_dma_desc *desc)
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{
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desc->desc_info = desc_info;
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desc->packet_info = pkt_info;
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desc->desc_info = cpu_to_le32(desc_info);
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desc->packet_info = cpu_to_le32(pkt_info);
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}
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static void set_pad_info(u32 pad0, u32 pad1, struct knav_dma_desc *desc)
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static void set_pad_info(u32 pad0, u32 pad1, u32 pad2, struct knav_dma_desc *desc)
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{
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desc->pad[0] = pad0;
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desc->pad[1] = pad1;
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desc->pad[0] = cpu_to_le32(pad0);
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desc->pad[1] = cpu_to_le32(pad1);
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desc->pad[2] = cpu_to_le32(pad1);
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}
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static void set_org_pkt_info(u32 buff, u32 buff_len,
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static void set_org_pkt_info(dma_addr_t buff, u32 buff_len,
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struct knav_dma_desc *desc)
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{
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desc->orig_buff = buff;
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desc->orig_len = buff_len;
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desc->orig_buff = cpu_to_le32(buff);
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desc->orig_len = cpu_to_le32(buff_len);
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}
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static void set_words(u32 *words, int num_words, u32 *desc)
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static void set_words(u32 *words, int num_words, __le32 *desc)
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{
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int i;
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for (i = 0; i < num_words; i++)
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desc[i] = words[i];
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desc[i] = cpu_to_le32(words[i]);
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}
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/* Read the e-fuse value as 32 bit values to be endian independent */
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@ -570,7 +581,7 @@ static void netcp_free_rx_desc_chain(struct netcp_intf *netcp,
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dma_addr_t dma_desc, dma_buf;
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unsigned int buf_len, dma_sz = sizeof(*ndesc);
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void *buf_ptr;
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u32 tmp;
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u32 pad[2];
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get_words(&dma_desc, 1, &desc->next_desc);
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@ -580,14 +591,15 @@ static void netcp_free_rx_desc_chain(struct netcp_intf *netcp,
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dev_err(netcp->ndev_dev, "failed to unmap Rx desc\n");
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break;
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}
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get_pkt_info(&dma_buf, &tmp, &dma_desc, ndesc);
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get_pad_info((u32 *)&buf_ptr, &tmp, ndesc);
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get_pad_ptr(&buf_ptr, ndesc);
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dma_unmap_page(netcp->dev, dma_buf, PAGE_SIZE, DMA_FROM_DEVICE);
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__free_page(buf_ptr);
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knav_pool_desc_put(netcp->rx_pool, desc);
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}
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get_pad_info((u32 *)&buf_ptr, &buf_len, desc);
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get_pad_info(&pad[0], &pad[1], &buf_len, desc);
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buf_ptr = (void *)(uintptr_t)(pad[0] + ((u64)pad[1] << 32));
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if (buf_ptr)
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netcp_frag_free(buf_len <= PAGE_SIZE, buf_ptr);
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knav_pool_desc_put(netcp->rx_pool, desc);
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@ -626,7 +638,6 @@ static int netcp_process_one_rx_packet(struct netcp_intf *netcp)
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struct netcp_packet p_info;
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struct sk_buff *skb;
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void *org_buf_ptr;
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u32 tmp;
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dma_desc = knav_queue_pop(netcp->rx_queue, &dma_sz);
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if (!dma_desc)
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@ -639,7 +650,7 @@ static int netcp_process_one_rx_packet(struct netcp_intf *netcp)
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}
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get_pkt_info(&dma_buff, &buf_len, &dma_desc, desc);
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get_pad_info((u32 *)&org_buf_ptr, &org_buf_len, desc);
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get_pad_ptr(&org_buf_ptr, desc);
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if (unlikely(!org_buf_ptr)) {
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dev_err(netcp->ndev_dev, "NULL bufptr in desc\n");
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@ -664,6 +675,7 @@ static int netcp_process_one_rx_packet(struct netcp_intf *netcp)
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/* Fill in the page fragment list */
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while (dma_desc) {
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struct page *page;
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void *ptr;
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ndesc = knav_pool_desc_unmap(netcp->rx_pool, dma_desc, dma_sz);
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if (unlikely(!ndesc)) {
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@ -672,14 +684,15 @@ static int netcp_process_one_rx_packet(struct netcp_intf *netcp)
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}
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get_pkt_info(&dma_buff, &buf_len, &dma_desc, ndesc);
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get_pad_info((u32 *)&page, &tmp, ndesc);
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get_pad_ptr(ptr, ndesc);
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page = ptr;
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if (likely(dma_buff && buf_len && page)) {
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dma_unmap_page(netcp->dev, dma_buff, PAGE_SIZE,
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DMA_FROM_DEVICE);
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} else {
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dev_err(netcp->ndev_dev, "Bad Rx desc dma_buff(%p), len(%d), page(%p)\n",
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(void *)dma_buff, buf_len, page);
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dev_err(netcp->ndev_dev, "Bad Rx desc dma_buff(%pad), len(%d), page(%p)\n",
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&dma_buff, buf_len, page);
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goto free_desc;
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}
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@ -750,7 +763,6 @@ static void netcp_free_rx_buf(struct netcp_intf *netcp, int fdq)
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unsigned int buf_len, dma_sz;
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dma_addr_t dma;
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void *buf_ptr;
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u32 tmp;
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/* Allocate descriptor */
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while ((dma = knav_queue_pop(netcp->rx_fdq[fdq], &dma_sz))) {
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@ -761,7 +773,7 @@ static void netcp_free_rx_buf(struct netcp_intf *netcp, int fdq)
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}
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get_org_pkt_info(&dma, &buf_len, desc);
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get_pad_info((u32 *)&buf_ptr, &tmp, desc);
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get_pad_ptr(buf_ptr, desc);
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if (unlikely(!dma)) {
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dev_err(netcp->ndev_dev, "NULL orig_buff in desc\n");
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@ -813,7 +825,7 @@ static int netcp_allocate_rx_buf(struct netcp_intf *netcp, int fdq)
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struct page *page;
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dma_addr_t dma;
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void *bufptr;
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u32 pad[2];
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u32 pad[3];
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/* Allocate descriptor */
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hwdesc = knav_pool_desc_get(netcp->rx_pool);
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@ -830,7 +842,7 @@ static int netcp_allocate_rx_buf(struct netcp_intf *netcp, int fdq)
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SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
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bufptr = netdev_alloc_frag(primary_buf_len);
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pad[1] = primary_buf_len;
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pad[2] = primary_buf_len;
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if (unlikely(!bufptr)) {
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dev_warn_ratelimited(netcp->ndev_dev,
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@ -842,7 +854,8 @@ static int netcp_allocate_rx_buf(struct netcp_intf *netcp, int fdq)
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if (unlikely(dma_mapping_error(netcp->dev, dma)))
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goto fail;
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pad[0] = (u32)bufptr;
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pad[0] = lower_32_bits((uintptr_t)bufptr);
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pad[1] = upper_32_bits((uintptr_t)bufptr);
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} else {
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/* Allocate a secondary receive queue entry */
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@ -853,8 +866,9 @@ static int netcp_allocate_rx_buf(struct netcp_intf *netcp, int fdq)
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}
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buf_len = PAGE_SIZE;
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dma = dma_map_page(netcp->dev, page, 0, buf_len, DMA_TO_DEVICE);
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pad[0] = (u32)page;
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pad[1] = 0;
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pad[0] = lower_32_bits(dma);
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pad[1] = upper_32_bits(dma);
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pad[2] = 0;
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}
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desc_info = KNAV_DMA_DESC_PS_INFO_IN_DESC;
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@ -864,7 +878,7 @@ static int netcp_allocate_rx_buf(struct netcp_intf *netcp, int fdq)
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pkt_info |= (netcp->rx_queue_id & KNAV_DMA_DESC_RETQ_MASK) <<
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KNAV_DMA_DESC_RETQ_SHIFT;
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set_org_pkt_info(dma, buf_len, hwdesc);
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set_pad_info(pad[0], pad[1], hwdesc);
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set_pad_info(pad[0], pad[1], pad[2], hwdesc);
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set_desc_info(desc_info, pkt_info, hwdesc);
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/* Push to FDQs */
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@ -935,8 +949,8 @@ static void netcp_free_tx_desc_chain(struct netcp_intf *netcp,
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dma_unmap_single(netcp->dev, dma_buf, buf_len,
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DMA_TO_DEVICE);
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else
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dev_warn(netcp->ndev_dev, "bad Tx desc buf(%p), len(%d)\n",
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(void *)dma_buf, buf_len);
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dev_warn(netcp->ndev_dev, "bad Tx desc buf(%pad), len(%d)\n",
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&dma_buf, buf_len);
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knav_pool_desc_put(netcp->tx_pool, ndesc);
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ndesc = NULL;
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@ -953,11 +967,11 @@ static int netcp_process_tx_compl_packets(struct netcp_intf *netcp,
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unsigned int budget)
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{
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struct knav_dma_desc *desc;
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void *ptr;
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struct sk_buff *skb;
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unsigned int dma_sz;
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dma_addr_t dma;
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int pkts = 0;
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u32 tmp;
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while (budget--) {
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dma = knav_queue_pop(netcp->tx_compl_q, &dma_sz);
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@ -970,7 +984,8 @@ static int netcp_process_tx_compl_packets(struct netcp_intf *netcp,
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continue;
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}
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get_pad_info((u32 *)&skb, &tmp, desc);
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get_pad_ptr(&ptr, desc);
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skb = ptr;
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netcp_free_tx_desc_chain(netcp, desc, dma_sz);
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if (!skb) {
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dev_err(netcp->ndev_dev, "No skb in Tx desc\n");
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@ -1059,6 +1074,7 @@ netcp_tx_map_skb(struct sk_buff *skb, struct netcp_intf *netcp)
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u32 page_offset = frag->page_offset;
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u32 buf_len = skb_frag_size(frag);
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dma_addr_t desc_dma;
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u32 desc_dma_32;
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u32 pkt_info;
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dma_addr = dma_map_page(dev, page, page_offset, buf_len,
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@ -1075,13 +1091,13 @@ netcp_tx_map_skb(struct sk_buff *skb, struct netcp_intf *netcp)
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goto free_descs;
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}
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desc_dma = knav_pool_desc_virt_to_dma(netcp->tx_pool,
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(void *)ndesc);
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desc_dma = knav_pool_desc_virt_to_dma(netcp->tx_pool, ndesc);
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pkt_info =
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(netcp->tx_compl_qid & KNAV_DMA_DESC_RETQ_MASK) <<
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KNAV_DMA_DESC_RETQ_SHIFT;
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set_pkt_info(dma_addr, buf_len, 0, ndesc);
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set_words(&desc_dma, 1, &pdesc->next_desc);
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desc_dma_32 = (u32)desc_dma;
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set_words(&desc_dma_32, 1, &pdesc->next_desc);
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pkt_len += buf_len;
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if (pdesc != desc)
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knav_pool_desc_map(netcp->tx_pool, pdesc,
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@ -1173,11 +1189,14 @@ static int netcp_tx_submit_skb(struct netcp_intf *netcp,
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}
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set_words(&tmp, 1, &desc->packet_info);
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set_words((u32 *)&skb, 1, &desc->pad[0]);
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tmp = lower_32_bits((uintptr_t)&skb);
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set_words(&tmp, 1, &desc->pad[0]);
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tmp = upper_32_bits((uintptr_t)&skb);
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set_words(&tmp, 1, &desc->pad[1]);
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if (tx_pipe->flags & SWITCH_TO_PORT_IN_TAGINFO) {
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tmp = tx_pipe->switch_to_port;
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set_words((u32 *)&tmp, 1, &desc->tag_info);
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set_words(&tmp, 1, &desc->tag_info);
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}
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/* submit packet descriptor */
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@ -144,17 +144,17 @@ struct knav_dma_cfg {
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* @psdata: Protocol specific
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*/
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struct knav_dma_desc {
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u32 desc_info;
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u32 tag_info;
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u32 packet_info;
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u32 buff_len;
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u32 buff;
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u32 next_desc;
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u32 orig_len;
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u32 orig_buff;
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u32 epib[KNAV_DMA_NUM_EPIB_WORDS];
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u32 psdata[KNAV_DMA_NUM_PS_WORDS];
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u32 pad[4];
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__le32 desc_info;
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__le32 tag_info;
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__le32 packet_info;
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__le32 buff_len;
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__le32 buff;
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__le32 next_desc;
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__le32 orig_len;
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__le32 orig_buff;
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__le32 epib[KNAV_DMA_NUM_EPIB_WORDS];
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__le32 psdata[KNAV_DMA_NUM_PS_WORDS];
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__le32 pad[4];
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} ____cacheline_aligned;
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#if IS_ENABLED(CONFIG_KEYSTONE_NAVIGATOR_DMA)
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