From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 230062E36E5 for ; Fri, 1 Aug 2025 11:21:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754047289; cv=none; b=VgvXp3Sdp4wj5UHq14zRuxubjc17v7Pti5lJU1X1g5Npsoe1OhEnU7mXR4fylVMnc08zEp4bJYdJ7GN4Gsm4/PG7VL1X9Qsvtys/DBH/MJXeviOkgrCrbq1LZeVKMjtldlrPX4cZyfPU29xew0mCrs3pzDvomuzGznUYxA0AQ/M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754047289; c=relaxed/simple; bh=pEp65GNdz3/656yb3ezhgbsXx5CGqU2Gt3GmTVnoYxY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=UqWrU0KSpzhvej0K4g089twPIonuNcGVRXPUhMlm8A+b9/NBqSxdwcR5iiqAVsWR5rXAWKYfdzRifH8giG8lThIjQzL5Qdw7hjr4XPGSXrRQbFZMI4setVsIdjpykj8AQKH2zGUf77C0vSbLZiSjyAN9MKkJnfipcZmAs2QYR4w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ERzDBUPF; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ERzDBUPF" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 760B7C4CEE7; Fri, 1 Aug 2025 11:21:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1754047288; bh=pEp65GNdz3/656yb3ezhgbsXx5CGqU2Gt3GmTVnoYxY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=ERzDBUPFX+gAzf/5o01l60KcG5wcIGEB7V8Nv4UZc5t9OszFE5rDzqMyqx2lPsJ4M +VX6TPf4eMh59JZMwPhHGFRWODj3bzGTN1NcE7B3OJRGrCmm5vgPTyHtTHOoegC8ow f88r5s1hj75Z9/FXhYRhBxLqEdmKBKM7E2pKR2xHyC/GaF/PMu4zu8E6IJz8dq/kkt ydJLyFcXOAzMX+LF3bNt6qt5tfPWIONpkT0JzeXb5JKS4SbvAmzovI7cXuvB945Ept IIoaW3azFOjyRVq6Gi7sLBOa7IEGRxOvdrq5uqqBtYO+ruMN8u8e8+zc6AfDyeOKEU KVzXsm7kbIhUg== Date: Fri, 1 Aug 2025 12:21:25 +0100 From: Simon Horman To: Jedrzej Jagielski Cc: intel-wired-lan@lists.osuosl.org, anthony.l.nguyen@intel.com, netdev@vger.kernel.org, Aleksandr Loktionov Subject: Re: [PATCH iwl-next v1] ixgbe: reduce number of reads when getting OROM data Message-ID: <20250801112125.GO8494@horms.kernel.org> References: <20250731125025.1683557-1-jedrzej.jagielski@intel.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250731125025.1683557-1-jedrzej.jagielski@intel.com> On Thu, Jul 31, 2025 at 02:50:25PM +0200, Jedrzej Jagielski wrote: > Currently, during locating the CIVD section, the ixgbe driver loops > over the OROM area and at each iteration reads only OROM-datastruct-size > amount of data. This results in many small reads and is inefficient. > > Optimize this by reading the entire OROM bank into memory once before > entering the loop. This significantly reduces the probing time. > > Reviewed-by: Aleksandr Loktionov > Signed-off-by: Jedrzej Jagielski Thanks, nits below not withstanding, this looks good to me. Reviewed-by: Simon Horman > --- > drivers/net/ethernet/intel/ixgbe/ixgbe_e610.c | 58 +++++++++++++------ > 1 file changed, 39 insertions(+), 19 deletions(-) > > diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_e610.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_e610.c > index 87b03c1992a8..048b2aae155a 100644 > --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_e610.c > +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_e610.c > @@ -3006,50 +3006,70 @@ static int ixgbe_get_nvm_srev(struct ixgbe_hw *hw, > * Searches through the Option ROM flash contents to locate the CIVD data for > * the image. > * > - * Return: the exit code of the operation. > + * Return: -ENOMEM when cannot allocate memory, -EDOM for checksum violation, > + * -ENODATA when cannot find proper data, -EIO for faulty read or > + * 0 on success. > + * > + * On success @civd stores collected data. > */ > static int > ixgbe_get_orom_civd_data(struct ixgbe_hw *hw, enum ixgbe_bank_select bank, > struct ixgbe_orom_civd_info *civd) > { > - struct ixgbe_orom_civd_info tmp; > + u32 orom_size = hw->flash.banks.orom_size; > + u8 *orom_data; > u32 offset; > int err; > > + orom_data = kzalloc(orom_size, GFP_KERNEL); > + if (!orom_data) > + return -ENOMEM; > + > + err = ixgbe_read_flash_module(hw, bank, > + IXGBE_E610_SR_1ST_OROM_BANK_PTR, 0, > + orom_data, orom_size); > + if (err) { > + err = -EIO; > + goto cleanup; > + } > + > /* The CIVD section is located in the Option ROM aligned to 512 bytes. > * The first 4 bytes must contain the ASCII characters "$CIV". > * A simple modulo 256 sum of all of the bytes of the structure must > * equal 0. > */ > - for (offset = 0; (offset + SZ_512) <= hw->flash.banks.orom_size; > - offset += SZ_512) { > + for (offset = 0; (offset + SZ_512) <= orom_size; offset += SZ_512) { nit: while we are here the inner parentheses could be removed > + struct ixgbe_orom_civd_info *tmp; > u8 sum = 0; > u32 i; > > - err = ixgbe_read_flash_module(hw, bank, > - IXGBE_E610_SR_1ST_OROM_BANK_PTR, > - offset, > - (u8 *)&tmp, sizeof(tmp)); > - if (err) > - return err; > + BUILD_BUG_ON(sizeof(*tmp) > SZ_512); > + > + tmp = (struct ixgbe_orom_civd_info *)&orom_data[offset]; > > /* Skip forward until we find a matching signature */ > - if (memcmp(IXGBE_OROM_CIV_SIGNATURE, tmp.signature, > - sizeof(tmp.signature))) > + if (memcmp(IXGBE_OROM_CIV_SIGNATURE, tmp->signature, > + sizeof(tmp->signature))) > continue; > > /* Verify that the simple checksum is zero */ > - for (i = 0; i < sizeof(tmp); i++) > - sum += ((u8 *)&tmp)[i]; > + for (i = 0; i < sizeof(*tmp); i++) > + sum += ((u8 *)tmp)[i]; > > - if (sum) > - return -EDOM; > + if (sum) { > + err = -EDOM; > + goto cleanup; > + } > > - *civd = tmp; > - return 0; > + *civd = *tmp; > + err = 0; > + goto cleanup; nit: maybe it's just me, but break feels more natural here. > } > > - return -ENODATA; > + err = -ENODATA; > +cleanup: > + kfree(orom_data); > + return err; > } > > /** > -- > 2.31.1 > >