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| author | Ben Hutchings <bhutchings@solarflare.com> | 2013-01-29 23:33:14 +0000 |
|---|---|---|
| committer | Ben Hutchings <bhutchings@solarflare.com> | 2013-03-07 20:22:06 +0000 |
| commit | 272baeeb6a98f5f746c2eeab4973c2df89e9d7ea (patch) | |
| tree | c894c86c4331a376e728fdffb5cdbcd301158628 /drivers/net/ethernet/sfc/rx.c | |
| parent | 80c2e716d555912168f93853f96a24d0de75897b (diff) | |
| download | linux-272baeeb6a98f5f746c2eeab4973c2df89e9d7ea.tar.gz linux-272baeeb6a98f5f746c2eeab4973c2df89e9d7ea.tar.bz2 linux-272baeeb6a98f5f746c2eeab4973c2df89e9d7ea.zip | |
sfc: Properly distinguish RX buffer and DMA lengths
Replace efx_nic::rx_buffer_len with efx_nic::rx_dma_len, the maximum
RX DMA length.
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Diffstat (limited to 'drivers/net/ethernet/sfc/rx.c')
| -rw-r--r-- | drivers/net/ethernet/sfc/rx.c | 19 |
1 files changed, 8 insertions, 11 deletions
diff --git a/drivers/net/ethernet/sfc/rx.c b/drivers/net/ethernet/sfc/rx.c index e7aa28eb9327..31361db28f91 100644 --- a/drivers/net/ethernet/sfc/rx.c +++ b/drivers/net/ethernet/sfc/rx.c @@ -27,8 +27,9 @@ /* Number of RX descriptors pushed at once. */ #define EFX_RX_BATCH 8 -/* Maximum size of a buffer sharing a page */ -#define EFX_RX_HALF_PAGE ((PAGE_SIZE >> 1) - sizeof(struct efx_rx_page_state)) +/* Maximum length for an RX descriptor sharing a page */ +#define EFX_RX_HALF_PAGE ((PAGE_SIZE >> 1) - sizeof(struct efx_rx_page_state) \ + - EFX_PAGE_IP_ALIGN) /* Size of buffer allocated for skb header area. */ #define EFX_SKB_HEADERS 64u @@ -52,10 +53,6 @@ static inline unsigned int efx_rx_buf_offset(struct efx_nic *efx, { return buf->page_offset + efx->type->rx_buffer_hash_size; } -static inline unsigned int efx_rx_buf_size(struct efx_nic *efx) -{ - return PAGE_SIZE << efx->rx_buffer_order; -} static u8 *efx_rx_buf_eh(struct efx_nic *efx, struct efx_rx_buffer *buf) { @@ -105,7 +102,7 @@ static int efx_init_rx_buffers(struct efx_rx_queue *rx_queue) if (unlikely(page == NULL)) return -ENOMEM; dma_addr = dma_map_page(&efx->pci_dev->dev, page, 0, - efx_rx_buf_size(efx), + PAGE_SIZE << efx->rx_buffer_order, DMA_FROM_DEVICE); if (unlikely(dma_mapping_error(&efx->pci_dev->dev, dma_addr))) { __free_pages(page, efx->rx_buffer_order); @@ -124,12 +121,12 @@ static int efx_init_rx_buffers(struct efx_rx_queue *rx_queue) rx_buf->dma_addr = dma_addr + EFX_PAGE_IP_ALIGN; rx_buf->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->len = efx->rx_dma_len; rx_buf->flags = 0; ++rx_queue->added_count; ++state->refcnt; - if ((~count & 1) && (efx->rx_buffer_len <= EFX_RX_HALF_PAGE)) { + if ((~count & 1) && (efx->rx_dma_len <= EFX_RX_HALF_PAGE)) { /* Use the second half of the page */ get_page(page); dma_addr += (PAGE_SIZE >> 1); @@ -153,7 +150,7 @@ static void efx_unmap_rx_buffer(struct efx_nic *efx, if (--state->refcnt == 0) { dma_unmap_page(&efx->pci_dev->dev, state->dma_addr, - efx_rx_buf_size(efx), + PAGE_SIZE << efx->rx_buffer_order, DMA_FROM_DEVICE); } else if (used_len) { dma_sync_single_for_cpu(&efx->pci_dev->dev, @@ -221,7 +218,7 @@ static void efx_recycle_rx_buffer(struct efx_channel *channel, rx_buf->flags = 0; - if (efx->rx_buffer_len <= EFX_RX_HALF_PAGE && + if (efx->rx_dma_len <= EFX_RX_HALF_PAGE && page_count(rx_buf->page) == 1) efx_resurrect_rx_buffer(rx_queue, rx_buf); |