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[93.39.149.95]) by smtp.gmail.com with ESMTPSA id t10sm5315485qkt.55.2020.09.19.17.39.40 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sat, 19 Sep 2020 17:39:43 -0700 (PDT) From: To: "'Andrew Lunn'" Cc: "'Miquel Raynal'" , "'Richard Weinberger'" , "'Vignesh Raghavendra'" , "'Rob Herring'" , "'David S. Miller'" , "'Jakub Kicinski'" , "'Heiner Kallweit'" , "'Russell King'" , "'Frank Rowand'" , "'Boris Brezillon'" , , , , References: <20200919223026.20803-1-ansuelsmth@gmail.com> <20200919223026.20803-5-ansuelsmth@gmail.com> <20200920003128.GC3673389@lunn.ch> In-Reply-To: <20200920003128.GC3673389@lunn.ch> Subject: R: [PATCH v2 4/4] dt-bindings: net: Document use of mac-address-increment Date: Sun, 20 Sep 2020 02:39:39 +0200 Message-ID: <006301d68ee6$87fcc400$97f64c00$@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQJTwTIROpBsKHcYsKMkb8exrd/FtgHUg4PZAkc+4zCoVWtPAA== Content-Language: it Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org > -----Messaggio originale----- > Da: Andrew Lunn > Inviato: domenica 20 settembre 2020 02:31 > A: Ansuel Smith > Cc: Miquel Raynal ; Richard Weinberger > ; Vignesh Raghavendra ; Rob Herring > ; David S. Miller ; Jakub > Kicinski ; Heiner Kallweit ; > Russell King ; Frank Rowand > ; Boris Brezillon ; linux- > mtd@lists.infradead.org; devicetree@vger.kernel.org; linux- > kernel@vger.kernel.org; netdev@vger.kernel.org > Oggetto: Re: [PATCH v2 4/4] dt-bindings: net: Document use of mac- > address-increment > > > + mac-address-increment: > > + description: > > + The MAC address can optionally be increased (or decreased using > > + negative values) from the original value readed (from a nvmem cell > > Read is irregular, there is no readed, just read. > > > + for example). This can be used if the mac is readed from a dedicated > > + partition and must be increased based on the number of device > > + present in the system. > > You should probably add there is no underflow/overflow to other bytes > of the MAC address. 00:01:02:03:04:ff + 1 == 00:01:02:03:04:00. > > > + minimum: -255 > > + maximum: 255 > > + > > + mac-address-increment-byte: > > + description: > > + If 'mac-address-increment' is defined, this will tell what byte of > > + the mac-address will be increased. If 'mac-address-increment' is > > + not defined, this option will do nothing. > > + default: 5 > > + minimum: 0 > > + maximum: 5 > > Is there a real need for this? A value of 0 seems like a bad idea, > since a unicast address could easily become a multicast address, which > is not valid for an interface address. It also does not seem like a > good idea to allow the OUI to be changed. So i think only bytes 3-5 > should be allowed, but even then, i don't think this is needed, unless > you do have a clear use case. > > Andrew Honestly the mac-address-increment-byte is added to give user some control but I don't really have a use case for it. Should I limit it to 3 or just remove the function? Will address the other 2 comment in v3. Thx for review.