diff options
Diffstat (limited to 'target/linux/generic/patches-4.4/077-0005-bgmac-stop-clearing-DMA-receive-control-register-rig.patch')
| -rw-r--r-- | target/linux/generic/patches-4.4/077-0005-bgmac-stop-clearing-DMA-receive-control-register-rig.patch | 54 |
1 files changed, 0 insertions, 54 deletions
diff --git a/target/linux/generic/patches-4.4/077-0005-bgmac-stop-clearing-DMA-receive-control-register-rig.patch b/target/linux/generic/patches-4.4/077-0005-bgmac-stop-clearing-DMA-receive-control-register-rig.patch deleted file mode 100644 index e09524b..0000000 --- a/target/linux/generic/patches-4.4/077-0005-bgmac-stop-clearing-DMA-receive-control-register-rig.patch +++ /dev/null @@ -1,54 +0,0 @@ -From fcdefccac976ee51dd6071832b842d8fb41c479c Mon Sep 17 00:00:00 2001 -From: Andy Gospodarek <gospo@broadcom.com> -Date: Mon, 31 Oct 2016 13:32:03 -0400 -Subject: [PATCH] bgmac: stop clearing DMA receive control register right after - it is set - -Current bgmac code initializes some DMA settings in the receive control -register for some hardware and then immediately clears those settings. -Not clearing those settings results in ~420Mbps *improvement* in -throughput; this system can now receive frames at line-rate on Broadcom -5871x hardware compared to ~520Mbps today. I also tested a few other -values but found there to be no discernible difference in CPU -utilization even if burst size and prefetching values are different. - -On the hardware tested there was no need to keep the code that cleared -all but bits 16-17, but since there is a wide variety of hardware that -used this driver (I did not look at all hardware docs for hardware using -this IP block), I find it wise to move this call up and clear bits just -after reading the default value from the hardware rather than completely -removing it. - -This is a good candidate for -stable >=3.14 since that is when the code -that was supposed to improve performance (but did not) was introduced. - -Signed-off-by: Andy Gospodarek <gospo@broadcom.com> -Fixes: 56ceecde1f29 ("bgmac: initialize the DMA controller of core...") -Cc: Hauke Mehrtens <hauke@hauke-m.de> -Acked-by: Hauke Mehrtens <hauke@hauke-m.de> -Signed-off-by: David S. Miller <davem@davemloft.net> ---- - drivers/net/ethernet/broadcom/bgmac.c | 5 ++++- - 1 file changed, 4 insertions(+), 1 deletion(-) - ---- a/drivers/net/ethernet/broadcom/bgmac.c -+++ b/drivers/net/ethernet/broadcom/bgmac.c -@@ -307,6 +307,10 @@ static void bgmac_dma_rx_enable(struct b - u32 ctl; - - ctl = bgmac_read(bgmac, ring->mmio_base + BGMAC_DMA_RX_CTL); -+ -+ /* preserve ONLY bits 16-17 from current hardware value */ -+ ctl &= BGMAC_DMA_RX_ADDREXT_MASK; -+ - if (bgmac->feature_flags & BGMAC_FEAT_RX_MASK_SETUP) { - ctl &= ~BGMAC_DMA_RX_BL_MASK; - ctl |= BGMAC_DMA_RX_BL_128 << BGMAC_DMA_RX_BL_SHIFT; -@@ -317,7 +321,6 @@ static void bgmac_dma_rx_enable(struct b - ctl &= ~BGMAC_DMA_RX_PT_MASK; - ctl |= BGMAC_DMA_RX_PT_1 << BGMAC_DMA_RX_PT_SHIFT; - } -- ctl &= BGMAC_DMA_RX_ADDREXT_MASK; - ctl |= BGMAC_DMA_RX_ENABLE; - ctl |= BGMAC_DMA_RX_PARITY_DISABLE; - ctl |= BGMAC_DMA_RX_OVERFLOW_CONT; |