This is a note to let you know that I've just added the patch titled
sfc: Fix efx_rx_buf_offset() in the presence of swiotlb
to the 3.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sfc-fix-efx_rx_buf_offset-in-the-presence-of-swiotlb.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From be254a1f0e75d7cbe7d0fae5b3424bc4849f772a Mon Sep 17 00:00:00 2001
From: Ben Hutchings <bhutchings@xxxxxxxxxxxxxx>
Date: Thu, 10 Jan 2013 23:51:54 +0000
Subject: sfc: Fix efx_rx_buf_offset() in the presence of swiotlb
From: Ben Hutchings <bhutchings@xxxxxxxxxxxxxx>
[ Upstream commits b590ace09d51cd39744e0f7662c5e4a0d1b5d952 and
c73e787a8db9117d59b5180baf83203a42ecadca ]
We assume that the mapping between DMA and virtual addresses is done
on whole pages, so we can find the page offset of an RX buffer using
the lower bits of the DMA address. However, swiotlb maps in units of
2K, breaking this assumption.
Add an explicit page_offset field to struct efx_rx_buffer.
Signed-off-by: Ben Hutchings <bhutchings@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/sfc/net_driver.h | 4 +++-
drivers/net/ethernet/sfc/rx.c | 10 +++++-----
2 files changed, 8 insertions(+), 6 deletions(-)
--- a/drivers/net/ethernet/sfc/net_driver.h
+++ b/drivers/net/ethernet/sfc/net_driver.h
@@ -210,6 +210,7 @@ struct efx_tx_queue {
* Will be %NULL if the buffer slot is currently free.
* @page: The associated page buffer. Valif iff @flags & %EFX_RX_BUF_PAGE.
* Will be %NULL if the buffer slot is currently free.
+ * @page_offset: Offset within page. Valid iff @flags & %EFX_RX_BUF_PAGE.
* @len: Buffer length, in bytes.
* @flags: Flags for buffer and packet state.
*/
@@ -219,7 +220,8 @@ struct efx_rx_buffer {
struct sk_buff *skb;
struct page *page;
} u;
- unsigned int len;
+ u16 page_offset;
+ u16 len;
u16 flags;
};
#define EFX_RX_BUF_PAGE 0x0001
--- a/drivers/net/ethernet/sfc/rx.c
+++ b/drivers/net/ethernet/sfc/rx.c
@@ -90,11 +90,7 @@ static unsigned int rx_refill_threshold;
static inline unsigned int efx_rx_buf_offset(struct efx_nic *efx,
struct efx_rx_buffer *buf)
{
- /* Offset is always within one page, so we don't need to consider
- * the page order.
- */
- return ((unsigned int) buf->dma_addr & (PAGE_SIZE - 1)) +
- efx->type->rx_buffer_hash_size;
+ return buf->page_offset + efx->type->rx_buffer_hash_size;
}
static inline unsigned int efx_rx_buf_size(struct efx_nic *efx)
{
@@ -187,6 +183,7 @@ static int efx_init_rx_buffers_page(stru
struct efx_nic *efx = rx_queue->efx;
struct efx_rx_buffer *rx_buf;
struct page *page;
+ unsigned int page_offset;
struct efx_rx_page_state *state;
dma_addr_t dma_addr;
unsigned index, count;
@@ -211,12 +208,14 @@ static int efx_init_rx_buffers_page(stru
state->dma_addr = dma_addr;
dma_addr += sizeof(struct efx_rx_page_state);
+ page_offset = sizeof(struct efx_rx_page_state);
split:
index = rx_queue->added_count & rx_queue->ptr_mask;
rx_buf = efx_rx_buffer(rx_queue, index);
rx_buf->dma_addr = dma_addr + EFX_PAGE_IP_ALIGN;
rx_buf->u.page = page;
+ rx_buf->page_offset = page_offset + EFX_PAGE_IP_ALIGN;
rx_buf->len = efx->rx_buffer_len - EFX_PAGE_IP_ALIGN;
rx_buf->flags = EFX_RX_BUF_PAGE;
++rx_queue->added_count;
@@ -227,6 +226,7 @@ static int efx_init_rx_buffers_page(stru
/* Use the second half of the page */
get_page(page);
dma_addr += (PAGE_SIZE >> 1);
+ page_offset += (PAGE_SIZE >> 1);
++count;
goto split;
}
Patches currently in stable-queue which might be from bhutchings@xxxxxxxxxxxxxx are
queue-3.8/sfc-properly-sync-rx-dma-buffer-when-it-is-not-the-last-in-the-page.patch
queue-3.8/sfc-only-use-tx-push-if-a-single-descriptor-is-to-be-written.patch
queue-3.8/sfc-fix-efx_rx_buf_offset-in-the-presence-of-swiotlb.patch
queue-3.8/drivers-net-ethernet-sfc-ptp.c-adjust-duplicate-test.patch
queue-3.8/sfc-disable-soft-interrupt-handling-during-efx_device_detach_sync.patch
queue-3.8/sfc-detach-net-device-when-stopping-queues-for-reconfiguration.patch
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