From 5e6a98dc4863e50a010ebdf09fa63c1e11929a85 Mon Sep 17 00:00:00 2001 From: Sara Sharon Date: Thu, 10 Mar 2016 17:40:56 +0200 Subject: [PATCH] iwlwifi: mvm: enable TCP/UDP checksum support for 9000 family Declare and enable support of RX and TX checksum for 9000 family. Configure offload_assist in the TX cmd accordingly to support TX csum. Signed-off-by: Sara Sharon Signed-off-by: Emmanuel Grumbach --- drivers/net/wireless/intel/iwlwifi/iwl-9000.c | 1 + .../net/wireless/intel/iwlwifi/iwl-config.h | 2 + .../net/wireless/intel/iwlwifi/mvm/mac80211.c | 13 +- drivers/net/wireless/intel/iwlwifi/mvm/tx.c | 124 +++++++++++++++++- 4 files changed, 133 insertions(+), 7 deletions(-) diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-9000.c b/drivers/net/wireless/intel/iwlwifi/iwl-9000.c index 277396a30713..1f25ba69516f 100644 --- a/drivers/net/wireless/intel/iwlwifi/iwl-9000.c +++ b/drivers/net/wireless/intel/iwlwifi/iwl-9000.c @@ -137,6 +137,7 @@ static const struct iwl_tt_params iwl9000_tt_params = { .dccm2_len = IWL9000_DCCM2_LEN, \ .smem_offset = IWL9000_SMEM_OFFSET, \ .smem_len = IWL9000_SMEM_LEN, \ + .features = IWL_TX_CSUM_NETIF_FLAGS | NETIF_F_RXCSUM, \ .thermal_params = &iwl9000_tt_params, \ .apmg_not_supported = true, \ .mq_rx_supported = true, \ diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-config.h b/drivers/net/wireless/intel/iwlwifi/iwl-config.h index 8cbd24875ffc..b0025570c7bb 100644 --- a/drivers/net/wireless/intel/iwlwifi/iwl-config.h +++ b/drivers/net/wireless/intel/iwlwifi/iwl-config.h @@ -131,6 +131,8 @@ enum iwl_led_mode { #define IWL_MAX_WD_TIMEOUT 120000 #define IWL_DEFAULT_MAX_TX_POWER 22 +#define IWL_TX_CSUM_NETIF_FLAGS (NETIF_F_IPV6_CSUM | NETIF_F_IP_CSUM |\ + NETIF_F_TSO | NETIF_F_TSO6) /* Antenna presence definitions */ #define ANT_NONE 0x0 diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c index 115d7aa5e720..4f5ec495b460 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c @@ -665,12 +665,13 @@ int iwl_mvm_mac_setup_register(struct iwl_mvm *mvm) } hw->netdev_features |= mvm->cfg->features; - if (!iwl_mvm_is_csum_supported(mvm)) - hw->netdev_features &= ~NETIF_F_RXCSUM; - - if (IWL_MVM_SW_TX_CSUM_OFFLOAD) - hw->netdev_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | - NETIF_F_TSO | NETIF_F_TSO6; + if (!iwl_mvm_is_csum_supported(mvm)) { + hw->netdev_features &= ~(IWL_TX_CSUM_NETIF_FLAGS | + NETIF_F_RXCSUM); + /* We may support SW TX CSUM */ + if (IWL_MVM_SW_TX_CSUM_OFFLOAD) + hw->netdev_features |= IWL_TX_CSUM_NETIF_FLAGS; + } ret = ieee80211_register_hw(mvm->hw); if (ret) diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/tx.c b/drivers/net/wireless/intel/iwlwifi/mvm/tx.c index 24cff98ecca0..efb9b98c4c98 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/tx.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/tx.c @@ -67,6 +67,7 @@ #include #include #include +#include #include "iwl-trans.h" #include "iwl-eeprom-parse.h" @@ -98,6 +99,111 @@ iwl_mvm_bar_check_trigger(struct iwl_mvm *mvm, const u8 *addr, addr, tid, ssn); } +#define OPT_HDR(type, skb, off) \ + (type *)(skb_network_header(skb) + (off)) + +static void iwl_mvm_tx_csum(struct iwl_mvm *mvm, struct sk_buff *skb, + struct ieee80211_hdr *hdr, + struct ieee80211_tx_info *info, + struct iwl_tx_cmd *tx_cmd) +{ +#if IS_ENABLED(CONFIG_INET) + u16 mh_len = ieee80211_hdrlen(hdr->frame_control); + u16 offload_assist = le16_to_cpu(tx_cmd->offload_assist); + u8 protocol = 0; + + /* + * Do not compute checksum if already computed or if transport will + * compute it + */ + if (skb->ip_summed != CHECKSUM_PARTIAL || IWL_MVM_SW_TX_CSUM_OFFLOAD) + return; + + /* We do not expect to be requested to csum stuff we do not support */ + if (WARN_ONCE(!(mvm->hw->netdev_features & IWL_TX_CSUM_NETIF_FLAGS) || + (skb->protocol != htons(ETH_P_IP) && + skb->protocol != htons(ETH_P_IPV6)), + "No support for requested checksum\n")) { + skb_checksum_help(skb); + return; + } + + if (skb->protocol == htons(ETH_P_IP)) { + protocol = ip_hdr(skb)->protocol; + } else { +#if IS_ENABLED(CONFIG_IPV6) + struct ipv6hdr *ipv6h = + (struct ipv6hdr *)skb_network_header(skb); + unsigned int off = sizeof(*ipv6h); + + protocol = ipv6h->nexthdr; + while (protocol != NEXTHDR_NONE && ipv6_ext_hdr(protocol)) { + /* only supported extension headers */ + if (protocol != NEXTHDR_ROUTING && + protocol != NEXTHDR_HOP && + protocol != NEXTHDR_DEST && + protocol != NEXTHDR_FRAGMENT) { + skb_checksum_help(skb); + return; + } + + if (protocol == NEXTHDR_FRAGMENT) { + struct frag_hdr *hp = + OPT_HDR(struct frag_hdr, skb, off); + + protocol = hp->nexthdr; + off += sizeof(struct frag_hdr); + } else { + struct ipv6_opt_hdr *hp = + OPT_HDR(struct ipv6_opt_hdr, skb, off); + + protocol = hp->nexthdr; + off += ipv6_optlen(hp); + } + } + /* if we get here - protocol now should be TCP/UDP */ +#endif + } + + if (protocol != IPPROTO_TCP && protocol != IPPROTO_UDP) { + WARN_ON_ONCE(1); + skb_checksum_help(skb); + return; + } + + /* enable L4 csum */ + offload_assist |= BIT(TX_CMD_OFFLD_L4_EN); + + /* + * Set offset to IP header (snap). + * We don't support tunneling so no need to take care of inner header. + * Size is in words. + */ + offload_assist |= (4 << TX_CMD_OFFLD_IP_HDR); + + /* Do IPv4 csum for AMSDU only (no IP csum for Ipv6) */ + if (skb->protocol == htons(ETH_P_IP) && + (offload_assist & BIT(TX_CMD_OFFLD_AMSDU))) { + ip_hdr(skb)->check = 0; + offload_assist |= BIT(TX_CMD_OFFLD_L3_EN); + } + + /* reset UDP/TCP header csum */ + if (protocol == IPPROTO_TCP) + tcp_hdr(skb)->check = 0; + else + udp_hdr(skb)->check = 0; + + /* mac header len should include IV, size is in words */ + if (info->control.hw_key) + mh_len += info->control.hw_key->iv_len; + mh_len /= 2; + offload_assist |= mh_len << TX_CMD_OFFLD_MH_SIZE; + + tx_cmd->offload_assist = cpu_to_le16(offload_assist); +#endif +} + /* * Sets most of the Tx cmd's fields */ @@ -196,6 +302,8 @@ void iwl_mvm_set_tx_cmd(struct iwl_mvm *mvm, struct sk_buff *skb, if (ieee80211_hdrlen(fc) % 4 && !(tx_cmd->offload_assist & cpu_to_le16(BIT(TX_CMD_OFFLD_AMSDU)))) tx_cmd->offload_assist |= cpu_to_le16(BIT(TX_CMD_OFFLD_PAD)); + + iwl_mvm_tx_csum(mvm, skb, hdr, info, tx_cmd); } /* @@ -466,6 +574,7 @@ static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb, u16 ip_base_id = ipv4 ? ntohs(ip_hdr(skb)->id) : 0; u16 amsdu_add, snap_ip_tcp, pad, i = 0; unsigned int dbg_max_amsdu_len; + netdev_features_t netdev_features = NETIF_F_CSUM_MASK | NETIF_F_SG; u8 *qc, tid, txf; snap_ip_tcp = 8 + skb_transport_header(skb) - skb_network_header(skb) + @@ -484,6 +593,19 @@ static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb, goto segment; } + /* + * Do not build AMSDU for IPv6 with extension headers. + * ask stack to segment and checkum the generated MPDUs for us. + */ + if (skb->protocol == htons(ETH_P_IPV6) && + ((struct ipv6hdr *)skb_network_header(skb))->nexthdr != + IPPROTO_TCP) { + num_subframes = 1; + pad = 0; + netdev_features &= ~NETIF_F_CSUM_MASK; + goto segment; + } + /* * No need to lock amsdu_in_ampdu_allowed since it can't be modified * during an BA session. @@ -577,7 +699,7 @@ segment: skb_shinfo(skb)->gso_size = num_subframes * mss; memcpy(cb, skb->cb, sizeof(cb)); - next = skb_gso_segment(skb, NETIF_F_CSUM_MASK | NETIF_F_SG); + next = skb_gso_segment(skb, netdev_features); skb_shinfo(skb)->gso_size = mss; if (WARN_ON_ONCE(IS_ERR(next))) return -EINVAL; -- 2.20.1