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Tue, 1 Sep 2026 09:08:39 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1788246522; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:content-language:in-reply-to:references; bh=q9fGXpZ9LF56jBhwOwvOI4LVfnaQEfa6lGW0ji++kNY=; b=BIfSUuJztHjVFi3sSWYu8XLIB6EszsN8BHv4rXOpS5qv474oVCjpFiykzNkWnshFqGoChM /+fv7z6cqiEYfdFYHImf4lOrj8jO8cDL40b6bhedr31TqgkihR9bTNwLt4pyOarE5tsKWw 6jGCti+rzHg6rdOgWOyts0sg9ZQGUFQ9pT1Tpy93lE9xUU/8ldtUnWy50cQ7IlUh0BoQXx qyAY6U2tcLucr/reFqvfmkDy75BGlaNSTVg+kHiGBz/KHW9TTfwQXuGXphafW8vuheXMgt XMNvtLMXIMpeQpASwkBQoJRdVZtIxUDKyAEC/SmbEMRmzYy0s33NySHo2Lg+tw== Message-ID: Date: Tue, 1 Sep 2026 09:08:38 +0200 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next 1/2] net: stmmac: dwmac4: Read the UC filter size from hardware capabilities To: Nicolai Buchwitz 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 References: <20260831070121.349778-1-maxime.chevallier@bootlin.com> <20260831070121.349778-2-maxime.chevallier@bootlin.com> <2631c832d5aebc56e152628132494545@tipi-net.de> Content-Language: en-US From: Maxime Chevallier In-Reply-To: <2631c832d5aebc56e152628132494545@tipi-net.de> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Last-TLS-Session-Version: TLSv1.3 Hi again Nicolai, 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)? > >> +    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? I stand corrected actually, after looking deeper, you're right :) On dwmac1000, the feature bit 4 is HASHSEL, whereas on dwmac4, bit4 of HW_Features0 is VLHASH, 2 different Hash tables :) dwmac4 doesn't seem to have a bit just to say "there's a hash table", but instead directly reports the sizeof of the hash table. So I'll ditch that as you recommend, maybe in its own patch. Maxime