AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2025-03-01 19:16:22 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

sfc: Use __iowrite64_copy instead of a slightly different local function

Browse Source 
__iowrite64_copy() isn't quite the same as efx_memcpy_64(), but
it looks close enough:

- The length is in units of qwords not bytes
- It never byte-swaps, but that doesn't make a difference now as PIO
  is only enabled for x86_64
- It doesn't include any memory barriers, but that's OK as there is a
  barrier just before pushing the doorbell
- mlx4_en uses it for the same purpose

Compile-tested only.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Acked-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings 2014-07-27 03:14:39 +01:00 committed by David S. Miller
parent 772e7023e6
commit 4984c23735
1 changed files with 7 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/net/ethernet/sfc/tx.c
View File

@ -189,18 +189,6 @@ struct efx_short_copy_buffer {
u8 buf[L1_CACHE_BYTES];
};
/* Copy in explicit 64-bit writes. */
static void efx_memcpy_64(void __iomem *dest, void *src, size_t len)
{
u64 *src64 = src;
u64 __iomem *dest64 = dest;
size_t l64 = len / 8;
size_t i;
for (i = 0; i < l64; i++)
writeq(src64[i], &dest64[i]);
}
/* Copy to PIO, respecting that writes to PIO buffers must be dword aligned.
* Advances piobuf pointer. Leaves additional data in the copy buffer.
*/
@ -210,7 +198,7 @@ static void efx_memcpy_toio_aligned(struct efx_nic *efx, u8 __iomem **piobuf,
{
int block_len = len & ~(sizeof(copy_buf->buf) - 1);
efx_memcpy_64(*piobuf, data, block_len);
__iowrite64_copy(*piobuf, data, block_len >> 3);
*piobuf += block_len;
len -= block_len;
@ -242,7 +230,8 @@ static void efx_memcpy_toio_aligned_cb(struct efx_nic *efx, u8 __iomem **piobuf,
if (copy_buf->used < sizeof(copy_buf->buf))
return;
efx_memcpy_64(*piobuf, copy_buf->buf, sizeof(copy_buf->buf));
__iowrite64_copy(*piobuf, copy_buf->buf,
sizeof(copy_buf->buf) >> 3);
*piobuf += sizeof(copy_buf->buf);
data += copy_to_buf;
len -= copy_to_buf;
@ -257,7 +246,8 @@ static void efx_flush_copy_buffer(struct efx_nic *efx, u8 __iomem *piobuf,
{
/* if there's anything in it, write the whole buffer, including junk */
if (copy_buf->used)
efx_memcpy_64(piobuf, copy_buf->buf, sizeof(copy_buf->buf));
__iowrite64_copy(piobuf, copy_buf->buf,
sizeof(copy_buf->buf) >> 3);
}
/* Traverse skb structure and copy fragments in to PIO buffer.
@ -316,8 +306,8 @@ efx_enqueue_skb_pio(struct efx_tx_queue *tx_queue, struct sk_buff *skb)
*/
BUILD_BUG_ON(L1_CACHE_BYTES >
SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
efx_memcpy_64(tx_queue->piobuf, skb->data,
ALIGN(skb->len, L1_CACHE_BYTES));
__iowrite64_copy(tx_queue->piobuf, skb->data,
ALIGN(skb->len, L1_CACHE_BYTES) >> 3);
}
EFX_POPULATE_QWORD_5(buffer->option,