From 59ca9572dee98f6a6dc52ce65d63ad466af81adc Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Sat, 26 Sep 2020 00:30:50 +0300 Subject: [PATCH] iwlwifi: mvm: use CHECKSUM_COMPLETE On newer hardware, we have the full checksum, so use it to report CHECKSUM_COMPLETE and avoid the protocol specific hardware parsing. Note that the hardware already parses/removes the SNAP header, so we actually literally get what we need to report to the stack, as we're expected to checksum everything after the L2 header (which is translated/added by mac80211). Signed-off-by: Johannes Berg Signed-off-by: Luca Coelho Link: https://lore.kernel.org/r/iwlwifi.20200926002540.869e829c815d.I70f374865b0acafc675a8d7959912eeaeb595acf@changeid Signed-off-by: Luca Coelho --- drivers/net/wireless/intel/iwlwifi/fw/api/rx.h | 6 ++- drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c | 73 ++++++++++++++++++++------ 2 files changed, 61 insertions(+), 18 deletions(-) diff --git a/drivers/net/wireless/intel/iwlwifi/fw/api/rx.h b/drivers/net/wireless/intel/iwlwifi/fw/api/rx.h index b8b36a4f9eb9..05923e39b600 100644 --- a/drivers/net/wireless/intel/iwlwifi/fw/api/rx.h +++ b/drivers/net/wireless/intel/iwlwifi/fw/api/rx.h @@ -560,7 +560,11 @@ struct iwl_rx_mpdu_desc_v3 { /** * @raw_xsum: raw xsum value */ - __le32 raw_xsum; + __be16 raw_xsum; + /** + * @reserved_xsum: reserved high bits in the raw checksum + */ + __le16 reserved_xsum; /* DW11 */ /** * @rate_n_flags: RX rate/flags encoding diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c index c15f7dbc9516..5cade5946cc4 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c @@ -8,7 +8,7 @@ * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved. * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH * Copyright(c) 2015 - 2017 Intel Deutschland GmbH - * Copyright(c) 2018 - 2019 Intel Corporation + * Copyright(c) 2018 - 2020 Intel Corporation * * This program is free software; you can redistribute it and/or modify * it under the terms of version 2 of the GNU General Public License as @@ -31,7 +31,7 @@ * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved. * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH * Copyright(c) 2015 - 2017 Intel Deutschland GmbH - * Copyright(c) 2018 - 2019 Intel Corporation + * Copyright(c) 2018 - 2020 Intel Corporation * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -221,6 +221,31 @@ static int iwl_mvm_create_skb(struct iwl_mvm *mvm, struct sk_buff *skb, skb_put_data(skb, hdr, hdrlen); skb_put_data(skb, (u8 *)hdr + hdrlen + pad_len, headlen - hdrlen); + /* + * If we did CHECKSUM_COMPLETE, the hardware only does it right for + * certain cases and starts the checksum after the SNAP. Check if + * this is the case - it's easier to just bail out to CHECKSUM_NONE + * in the cases the hardware didn't handle, since it's rare to see + * such packets, even though the hardware did calculate the checksum + * in this case, just starting after the MAC header instead. + */ + if (skb->ip_summed == CHECKSUM_COMPLETE) { + struct { + u8 hdr[6]; + __be16 type; + } __packed *shdr = (void *)((u8 *)hdr + hdrlen + pad_len); + + if (unlikely(headlen - hdrlen < sizeof(*shdr) || + !ether_addr_equal(shdr->hdr, rfc1042_header) || + (shdr->type != htons(ETH_P_IP) && + shdr->type != htons(ETH_P_ARP) && + shdr->type != htons(ETH_P_IPV6) && + shdr->type != htons(ETH_P_8021Q) && + shdr->type != htons(ETH_P_PAE) && + shdr->type != htons(ETH_P_TDLS)))) + skb->ip_summed = CHECKSUM_NONE; + } + fraglen = len - headlen; if (fraglen) { @@ -393,22 +418,36 @@ static int iwl_mvm_rx_crypto(struct iwl_mvm *mvm, struct ieee80211_hdr *hdr, return 0; } -static void iwl_mvm_rx_csum(struct ieee80211_sta *sta, +static void iwl_mvm_rx_csum(struct iwl_mvm *mvm, + struct ieee80211_sta *sta, struct sk_buff *skb, - struct iwl_rx_mpdu_desc *desc) + struct iwl_rx_packet *pkt) { - struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); - struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); - u16 flags = le16_to_cpu(desc->l3l4_flags); - u8 l3_prot = (u8)((flags & IWL_RX_L3L4_L3_PROTO_MASK) >> - IWL_RX_L3_PROTO_POS); - - if (mvmvif->features & NETIF_F_RXCSUM && - flags & IWL_RX_L3L4_TCP_UDP_CSUM_OK && - (flags & IWL_RX_L3L4_IP_HDR_CSUM_OK || - l3_prot == IWL_RX_L3_TYPE_IPV6 || - l3_prot == IWL_RX_L3_TYPE_IPV6_FRAG)) - skb->ip_summed = CHECKSUM_UNNECESSARY; + struct iwl_rx_mpdu_desc *desc = (void *)pkt->data; + + if (mvm->trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_AX210) { + if (pkt->len_n_flags & cpu_to_le32(FH_RSCSR_RPA_EN)) { + u16 hwsum = be16_to_cpu(desc->v3.raw_xsum); + + skb->ip_summed = CHECKSUM_COMPLETE; + skb->csum = csum_unfold(~(__force __sum16)hwsum); + } + } else { + struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); + struct iwl_mvm_vif *mvmvif; + u16 flags = le16_to_cpu(desc->l3l4_flags); + u8 l3_prot = (u8)((flags & IWL_RX_L3L4_L3_PROTO_MASK) >> + IWL_RX_L3_PROTO_POS); + + mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); + + if (mvmvif->features & NETIF_F_RXCSUM && + flags & IWL_RX_L3L4_TCP_UDP_CSUM_OK && + (flags & IWL_RX_L3L4_IP_HDR_CSUM_OK || + l3_prot == IWL_RX_L3_TYPE_IPV6 || + l3_prot == IWL_RX_L3_TYPE_IPV6_FRAG)) + skb->ip_summed = CHECKSUM_UNNECESSARY; + } } /* @@ -1796,7 +1835,7 @@ void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi, } if (ieee80211_is_data(hdr->frame_control)) - iwl_mvm_rx_csum(sta, skb, desc); + iwl_mvm_rx_csum(mvm, sta, skb, pkt); if (iwl_mvm_is_dup(sta, queue, rx_status, hdr, desc)) { kfree_skb(skb); -- 2.11.0