From 07abde549bc1204685b0aec29acc8c75b18ac1f5 Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Mon, 30 Jan 2023 15:01:51 -0600 Subject: net: ipa: support more endpoints Increase the number of endpoints supported by the driver to 36, which IPA v5.0 supports. This makes it impossible to check at build time whether the supported number is too big to fit within the (5-bit) PACKET_INIT destination endpoint field. Instead, convert the build time check to compare against what fits in 8 bits. Add a check in ipa_endpoint_config() to also ensure the hardware reports an endpoint count that's in the expected range. Just open-code 32 as the limit (the PACKET_INIT field mask is not available where we'd want to use it). Signed-off-by: Alex Elder Reviewed-by: Leon Romanovsky Signed-off-by: Jakub Kicinski --- drivers/net/ipa/ipa_cmd.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) (limited to 'drivers/net/ipa/ipa_cmd.c') diff --git a/drivers/net/ipa/ipa_cmd.c b/drivers/net/ipa/ipa_cmd.c index bb3dfa9a2bc8..aa2b594ca506 100644 --- a/drivers/net/ipa/ipa_cmd.c +++ b/drivers/net/ipa/ipa_cmd.c @@ -1,7 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved. - * Copyright (C) 2019-2022 Linaro Ltd. + * Copyright (C) 2019-2023 Linaro Ltd. */ #include @@ -157,9 +157,14 @@ static void ipa_cmd_validate_build(void) BUILD_BUG_ON(field_max(IP_FLTRT_FLAGS_HASH_ADDR_FMASK) != field_max(IP_FLTRT_FLAGS_NHASH_ADDR_FMASK)); - /* Valid endpoint numbers must fit in the IP packet init command */ - BUILD_BUG_ON(field_max(IPA_PACKET_INIT_DEST_ENDPOINT_FMASK) < - IPA_ENDPOINT_MAX - 1); + /* Prior to IPA v5.0, we supported no more than 32 endpoints, + * and this was reflected in some 5-bit fields that held + * endpoint numbers. Starting with IPA v5.0, the widths of + * these fields were extended to 8 bits, meaning up to 256 + * endpoints. If the driver claims to support more than + * that it's an error. + */ + BUILD_BUG_ON(IPA_ENDPOINT_MAX - 1 > U8_MAX); } /* Validate a memory region holding a table */ -- cgit