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Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x1165-00000009IHz-0OHY; Mon, 31 Aug 2026 12:26:45 +0000 Received: from mail.tipi-net.de ([2a03:4000:43:185::1]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1x1162-00000009IHb-45NH for linux-arm-kernel@lists.infradead.org; Mon, 31 Aug 2026 12:26:44 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id B3EA7A3C01; Mon, 31 Aug 2026 14:26:36 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tipi-net.de; s=dkim; t=1788179199; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=M8qwEVOrCnuxFS57aOl0YCGu5dSb4p68XufXY5WyeXU=; b=Qiu1W9BiZBvUrURamh+SrkfApZPN33wZIgQckXKwFgAz+cttmbo16fspc0Qv2MOv1kI6iG J7iNcnYqS7oFa3cyTEWfheR2yuu6GxdoanoLLeS47DgaJx57nnJe1U2DvvzwP3KY4cHisF CgcwVr32KXGb6LGT8QQkXw5vFPZVLoWOAyInWC2vRY9+gJwgi3VzgT4a9QyHUFtwUcuOYF p60pMClSaYxuBlPDMdwMi6ilGTz328T/pkuEIra4u+qzXw7eaIlRGkX88sVN0svUwy2/aj 6W7Jse/u71ADqgxVCFTyF3TT/CYb/TR0jxzpktm6eC/Gn3GdrqTk0NN8KpD7Vg== MIME-Version: 1.0 Date: Mon, 31 Aug 2026 14:26:36 +0200 From: Nicolai Buchwitz To: Maxime Chevallier Cc: Andrew Lunn , Jakub Kicinski , davem@davemloft.net, Eric Dumazet , Paolo Abeni , Simon Horman , Maxime Coquelin , Alexandre Torgue , Russell King , thomas.petazzoni@bootlin.com, =?UTF-8?Q?Alexis_Lothor=C3=A9?= , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-stm32@st-md-mailman.stormreply.com Subject: Re: [PATCH net-next 1/2] net: stmmac: dwmac4: Read the UC filter size from hardware capabilities In-Reply-To: <480f15e2-e045-46b7-89af-1fbcefd3c4eb@bootlin.com> References: <20260831070121.349778-1-maxime.chevallier@bootlin.com> <20260831070121.349778-2-maxime.chevallier@bootlin.com> <2631c832d5aebc56e152628132494545@tipi-net.de> <480f15e2-e045-46b7-89af-1fbcefd3c4eb@bootlin.com> Message-ID: <495059f3c43a20a48cc8c0e114ba4cc5@tipi-net.de> X-Sender: nb@tipi-net.de Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Last-TLS-Session-Version: TLSv1.3 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260831_052643_330889_13BDCEDF X-CRM114-Status: GOOD ( 22.55 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 31.8.2026 14:15, Maxime Chevallier wrote: > On 8/31/26 14:04, Nicolai Buchwitz wrote: >> Hi Maxime >> >> On 31.8.2026 09:01, Maxime Chevallier wrote: >>> dwmac4 has multiple banks of perfect filter entries, independently >>> configurable during IP integration. >>> >>> The multi_addr bank reports a number between 0 and 31 corresponding >>> to >>> the actual number of entries in that bank, while the 32 and 64 banks >>> are all-or-nothing. >>> >>> Expose these caps over debugfs as well. >>> >>> Signed-off-by: Maxime Chevallier >>> --- >> >>> [...] >> >>> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h >>> b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h >>> index 6382836828ba..89368e34a388 100644 >>> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h >>> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h >>> @@ -176,7 +176,9 @@ enum power_event { >>> >>>  /* MAC HW features0 bitmap */ >>>  #define GMAC_HW_FEAT_SAVLANINS        BIT(27) >>> -#define GMAC_HW_FEAT_ADDMAC        BIT(18) >>> +#define GMAC_HW_FEAT_MACADR64SEL    BIT(24) >>> +#define GMAC_HW_FEAT_MACADR32SEL    BIT(23) >>> +#define GMAC_HW_FEAT_ADDMAC        GENMASK(22, 18) >>>  #define GMAC_HW_FEAT_RXCOESEL        BIT(16) >>>  #define GMAC_HW_FEAT_TXCOSEL        BIT(14) >>>  #define GMAC_HW_FEAT_EEESEL        BIT(13) >>> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c >>> b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c >>> index 23ffe1adcd0d..14ac3f0e51f7 100644 >>> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c >>> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c >>> @@ -388,6 +388,8 @@ static int dwmac4_get_hw_feature(void __iomem >>> *ioaddr, >>>      dma_cap->half_duplex = (hw_cap & GMAC_HW_FEAT_HDSEL) >> 2; >>>      dma_cap->vlhash = (hw_cap & GMAC_HW_FEAT_VLHASH) >> 4; >>>      dma_cap->multi_addr = (hw_cap & GMAC_HW_FEAT_ADDMAC) >> 18; >> >> Now that ADDMAC has grown from single bit to a mask, the hardcoded 18 >> has to match >> dwmac4.h. So IMHO it would make sense to use FIELD_GET() here (like >> actphyif)? > > It's hardcoded all over, if you look at how all the other fields from > the features > are read. I can change it if you really think it's worth, however I'd > rather > do a proper cleanup of how all the properties are read at once :) Perfectly fine for me. Ran into a similar, but unrelated issue recently, so I just wanted to flag it (for the future) :) > >> >>> +    dma_cap->additional_32_addr = (hw_cap & >>> GMAC_HW_FEAT_MACADR32SEL) >> 23; >>> +    dma_cap->additional_64_addr = (hw_cap & >>> GMAC_HW_FEAT_MACADR64SEL) >> 24; >>>      dma_cap->pcs = (hw_cap & GMAC_HW_FEAT_PCSSEL) >> 3; >>>      dma_cap->sma_mdio = (hw_cap & GMAC_HW_FEAT_SMASEL) >> 5; >>>      dma_cap->pmt_remote_wake_up = (hw_cap & GMAC_HW_FEAT_RWKSEL) >> >>> 6; >>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c >>> b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c >>> index f2fc89176654..a885f8cfef21 100644 >>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c >>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c >>> @@ -6580,6 +6580,18 @@ static int stmmac_dma_cap_show(struct seq_file >>> *seq, void *v) >>>          seq_printf(seq, >>>                 "\tNumber of Additional MAC address registers: %d\n", >>>                 priv->dma_cap.multi_addr); >>> +    } else if (priv->plat->core_type == DWMAC_CORE_GMAC4) { >>> +        seq_printf(seq, >>> +               "\tNumber of MAC address registers (1-31): %d\n", >>> +               priv->dma_cap.multi_addr); >>> +        seq_printf(seq, >>> +               "\tAdditional 32 MAC address registers (32-63): >>> %s\n", >>> +               priv->dma_cap.additional_32_addr ? "Y" : "N"); >>> +        seq_printf(seq, >>> +               "\tAdditional 64 MAC address registers (64-127): >>> %s\n", >>> +               priv->dma_cap.additional_64_addr ? "Y" : "N"); >>> +        seq_printf(seq, "\tHash Filter: %s\n", >>> +               (priv->dma_cap.hash_filter) ? "Y" : "N"); >> >> hash_filter seems to be only set in dwmac1000_dma.c? So on dwmac4 it >> would always print N? > > Yeah but dwmac4 has a hash filter, but same as the UC filter it's just > not plumbed > in :/ > > Let's leave this flag here, hash filter addition for MC filtering is > coming-up, so let's not > drop it now only to re-enable it after, one of the other wonderful > discoveries found by > running the selftests... Also fine with me. > >> >>>      } else { >>>          seq_printf(seq, "\tHash Filter: %s\n", >>>                 (priv->dma_cap.hash_filter) ? "Y" : "N"); >> >> Thanks, >> Nicolai > > Maxime With both comments addressed and agreed to keep it as is until a cleanup in the future: Reviewed-by: Nicolai Buchwitz Thanks, Nicolai