From 62b330baede3849897ce7fc5534eadc34cd03a51 Mon Sep 17 00:00:00 2001 From: Steve Hodgson Date: Tue, 1 Jun 2010 11:20:53 +0000 Subject: sfc: Allow shared pages to be recycled Insert a structure at the start of the shared page that tracks the dma mapping refcnt. DMA into the next cache line of the (shared) page (plus EFX_PAGE_IP_ALIGN). When recycling a page, check the page refcnt. If the page is otherwise unused, then resurrect the other receive buffer that previously referenced the page. Be careful not to overflow the receive ring, since we can now resurrect n receive buffers in a row. Signed-off-by: Ben Hutchings Signed-off-by: David S. Miller --- drivers/net/sfc/efx.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/net/sfc/efx.c') diff --git a/drivers/net/sfc/efx.c b/drivers/net/sfc/efx.c index 5d9ef05e6abb..aae33471029a 100644 --- a/drivers/net/sfc/efx.c +++ b/drivers/net/sfc/efx.c @@ -469,7 +469,8 @@ static void efx_init_channels(struct efx_nic *efx) efx->rx_buffer_len = (max(EFX_PAGE_IP_ALIGN, NET_IP_ALIGN) + EFX_MAX_FRAME_LEN(efx->net_dev->mtu) + efx->type->rx_buffer_padding); - efx->rx_buffer_order = get_order(efx->rx_buffer_len); + efx->rx_buffer_order = get_order(efx->rx_buffer_len + + sizeof(struct efx_rx_page_state)); /* Initialise the channels */ efx_for_each_channel(channel, efx) { -- cgit