From patchwork Mon Jul 17 12:06:03 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rohan G Thomas X-Patchwork-Id: 13316451 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mga05.intel.com ([192.55.52.43]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qLN1a-003wuh-2O for linux-arm-kernel@lists.infradead.org; Mon, 17 Jul 2023 12:08:34 +0000 From: Rohan G Thomas Subject: [PATCH net-next 1/1] net: stmmac: xgmac: Fix L3L4 filter count Date: Mon, 17 Jul 2023 20:06:03 +0800 Message-Id: <20230717120603.5053-1-rohan.g.thomas@intel.com> MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+lwn-linux-arm-kernel=archive.lwn.net@lists.infradead.org List-Archive: To: "David S . Miller" , Giuseppe Cavallaro , Alexandre Torgue , Jose Abreu , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Maxime Coquelin Cc: netdev@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Rohan G Thomas , Andy Shevchenko Get the exact count of L3L4 filters when the L3L4FNUM field of HW_FEATURE1 register is >= 8. If L3L4FNUM < 8, then the number of L3L4 filters supported by XGMAC is equal to L3L4FNUM. From L3L4FNUM >= 8 the number of L3L4 filters goes on like 8, 16, 32, ... Current maximum of L3L4FNUM = 10. Also, fix the XGMAC_IDDR bitmask of L3L4_ADDR_CTRL register. IDDR field starts from the 8th bit of the L3L4_ADDR_CTRL register. IDDR[3:0] indicates the type of L3L4 filter register while IDDR[8:4] indicates the filter number (0 to 31). So overall 9 bits are used for IDDR (i.e. L3L4_ADDR_CTRL[16:8]) to address the registers of all the filters. Currently, XGMAC_IDDR is GENMASK(15,8), causing issues accessing L3L4 filters above 15 for those XGMACs configured with more than 16 L3L4 filters. Signed-off-by: Rohan G Thomas Reviewed-by: Andy Shevchenko --- drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h | 2 +- drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c | 10 ++++++++++ 2 files changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h index 1913385df685..153321fe42c3 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h +++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h @@ -165,7 +165,7 @@ #define XGMAC_DCS_SHIFT 16 #define XGMAC_ADDRx_LOW(x) (0x00000304 + (x) * 0x8) #define XGMAC_L3L4_ADDR_CTRL 0x00000c00 -#define XGMAC_IDDR GENMASK(15, 8) +#define XGMAC_IDDR GENMASK(16, 8) #define XGMAC_IDDR_SHIFT 8 #define XGMAC_IDDR_FNUM 4 #define XGMAC_TT BIT(1) diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c index 070bd912580b..df5af52fd1a1 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c @@ -408,6 +408,16 @@ static int dwxgmac2_get_hw_feature(void __iomem *ioaddr, /* MAC HW feature 1 */ hw_cap = readl(ioaddr + XGMAC_HW_FEATURE1); dma_cap->l3l4fnum = (hw_cap & XGMAC_HWFEAT_L3L4FNUM) >> 27; + /* If L3L4FNUM < 8, then the number of L3L4 filters supported by + * XGMAC is equal to L3L4FNUM. From L3L4FNUM >= 8 the number of + * L3L4 filters goes on like 8, 16, 32, ... Current maximum of + * L3L4FNUM = 10. + */ + if (dma_cap->l3l4fnum >= 8 && dma_cap->l3l4fnum <= 10) + dma_cap->l3l4fnum = 8 << (dma_cap->l3l4fnum - 8); + else if (dma_cap->l3l4fnum > 10) + dma_cap->l3l4fnum = 32; + dma_cap->hash_tb_sz = (hw_cap & XGMAC_HWFEAT_HASHTBLSZ) >> 24; dma_cap->rssen = (hw_cap & XGMAC_HWFEAT_RSSEN) >> 20; dma_cap->tsoen = (hw_cap & XGMAC_HWFEAT_TSOEN) >> 18;