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Date: Fri, 22 Dec 2017 16:24:24 +0800
From: Yanjun Zhu <yanjun.zhu@...cle.com>
To: Shannon Nelson <shannon.nelson@...cle.com>,
intel-wired-lan@...ts.osuosl.org, jeffrey.t.kirsher@...el.com
Cc: steffen.klassert@...unet.com, sowmini.varadhan@...cle.com,
netdev@...r.kernel.org
Subject: Re: [PATCH v3 next-queue 08/10] ixgbe: process the Tx ipsec offload
On 2017/12/20 8:00, Shannon Nelson wrote:
> If the skb has a security association referenced in the skb, then
> set up the Tx descriptor with the ipsec offload bits. While we're
> here, we fix an oddly named field in the context descriptor struct.
>
> v3: added ifdef CONFIG_XFRM_OFFLOAD check around call to ixgbe_ipsec_tx()
>
> v2: use ihl != 5
> move the ixgbe_ipsec_tx() call to near the call to ixgbe_tso()
> drop the ipsec packet if the tx offload setup fails
> simplify the ixgbe_ipsec_tx() parameters by using 'first'
> leave out the ixgbe_tso() changes since we don't support TSO
> with ipsec yet.
>
> Signed-off-by: Shannon Nelson <shannon.nelson@...cle.com>
> ---
> drivers/net/ethernet/intel/ixgbe/ixgbe.h | 10 +++-
> drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c | 79 ++++++++++++++++++++++++++
> drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c | 4 +-
> drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 26 +++++++--
> drivers/net/ethernet/intel/ixgbe/ixgbe_type.h | 2 +-
> 5 files changed, 112 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
> index a094b23..3d2b7bf 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
> @@ -171,10 +171,11 @@ enum ixgbe_tx_flags {
> IXGBE_TX_FLAGS_CC = 0x08,
> IXGBE_TX_FLAGS_IPV4 = 0x10,
> IXGBE_TX_FLAGS_CSUM = 0x20,
> + IXGBE_TX_FLAGS_IPSEC = 0x40,
>
> /* software defined flags */
> - IXGBE_TX_FLAGS_SW_VLAN = 0x40,
> - IXGBE_TX_FLAGS_FCOE = 0x80,
> + IXGBE_TX_FLAGS_SW_VLAN = 0x80,
> + IXGBE_TX_FLAGS_FCOE = 0x100,
> };
>
> /* VLAN info */
> @@ -1014,6 +1015,8 @@ void ixgbe_ipsec_restore(struct ixgbe_adapter *adapter);
> void ixgbe_ipsec_rx(struct ixgbe_ring *rx_ring,
> union ixgbe_adv_rx_desc *rx_desc,
> struct sk_buff *skb);
> +int ixgbe_ipsec_tx(struct ixgbe_ring *tx_ring, struct ixgbe_tx_buffer *first,
> + struct ixgbe_ipsec_tx_data *itd);
> #else
> static inline void ixgbe_init_ipsec_offload(struct ixgbe_adapter *adapter) { };
> static inline void ixgbe_stop_ipsec_offload(struct ixgbe_adapter *adapter) { };
> @@ -1021,5 +1024,8 @@ static inline void ixgbe_ipsec_restore(struct ixgbe_adapter *adapter) { };
> static inline void ixgbe_ipsec_rx(struct ixgbe_ring *rx_ring,
> union ixgbe_adv_rx_desc *rx_desc,
> struct sk_buff *skb) { };
> +static inline int ixgbe_ipsec_tx(struct ixgbe_ring *tx_ring,
> + struct ixgbe_tx_buffer *first,
> + struct ixgbe_ipsec_tx_data *itd) { return 0; };
> #endif /* CONFIG_XFRM_OFFLOAD */
> #endif /* _IXGBE_H_ */
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
> index a9b8f5c..c2fd2ac 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
> @@ -695,12 +695,91 @@ static void ixgbe_ipsec_del_sa(struct xfrm_state *xs)
> }
> }
>
> +/**
> + * ixgbe_ipsec_offload_ok - can this packet use the xfrm hw offload
> + * @skb: current data packet
> + * @xs: pointer to transformer state struct
> + **/
> +static bool ixgbe_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
> +{
> + if (xs->props.family == AF_INET) {
> + /* Offload with IPv4 options is not supported yet */
> + if (ip_hdr(skb)->ihl != 5)
> + return false;
> + } else {
> + /* Offload with IPv6 extension headers is not support yet */
> + if (ipv6_ext_hdr(ipv6_hdr(skb)->nexthdr))
> + return false;
> + }
> +
> + return true;
> +}
> +
> static const struct xfrmdev_ops ixgbe_xfrmdev_ops = {
> .xdo_dev_state_add = ixgbe_ipsec_add_sa,
> .xdo_dev_state_delete = ixgbe_ipsec_del_sa,
> + .xdo_dev_offload_ok = ixgbe_ipsec_offload_ok,
> };
>
> /**
> + * ixgbe_ipsec_tx - setup Tx flags for ipsec offload
> + * @tx_ring: outgoing context
> + * @first: current data packet
> + * @itd: ipsec Tx data for later use in building context descriptor
> + **/
> +int ixgbe_ipsec_tx(struct ixgbe_ring *tx_ring,
> + struct ixgbe_tx_buffer *first,
> + struct ixgbe_ipsec_tx_data *itd)
> +{
> + struct ixgbe_adapter *adapter = netdev_priv(tx_ring->netdev);
> + struct ixgbe_ipsec *ipsec = adapter->ipsec;
> + struct xfrm_state *xs;
> + struct tx_sa *tsa;
> +
> + if (!first->skb->sp->len) {
Hi, Nelson
The function ixgbe_ipsec_tx is called in tx fastpath. Can we add
unlikely as below:
if (unlikely(!first->skb->sp->len)) ?
If I am wrong, please correct me.
Thanks a lot.
Zhu Yanjun
> + netdev_err(tx_ring->netdev, "%s: no xfrm state len = %d\n",
> + __func__, first->skb->sp->len);
> + return 0;
> + }
> +
> + xs = xfrm_input_state(first->skb);
> + if (!xs) {
if (unlikely(!xs)) {
> + netdev_err(tx_ring->netdev, "%s: no xfrm_input_state() xs = %p\n",
> + __func__, xs);
> + return 0;
> + }
> +
> + itd->sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
> + if (itd->sa_idx > IXGBE_IPSEC_MAX_SA_COUNT) {
if (unlikely(itd->sa_idx > IXGBE_IPSEC_MAX_SA_COUNT))
> + netdev_err(tx_ring->netdev, "%s: bad sa_idx=%d handle=%lu\n",
> + __func__, itd->sa_idx, xs->xso.offload_handle);
> + return 0;
> + }
> +
> + tsa = &ipsec->tx_tbl[itd->sa_idx];
> + if (!tsa->used) {
if (unlikely(!tsa->used)) {
> + netdev_err(tx_ring->netdev, "%s: unused sa_idx=%d\n",
> + __func__, itd->sa_idx);
> + return 0;
> + }
> +
> + first->tx_flags |= IXGBE_TX_FLAGS_IPSEC | IXGBE_TX_FLAGS_CC;
> +
> + itd->flags = 0;
> + if (xs->id.proto == IPPROTO_ESP) {
> + itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_TYPE_ESP |
> + IXGBE_ADVTXD_TUCMD_L4T_TCP;
> + if (first->protocol == htons(ETH_P_IP))
> + itd->flags |= IXGBE_ADVTXD_TUCMD_IPV4;
> + itd->trailer_len = xs->props.trailer_len;
> + }
> + if (tsa->encrypt)
> + itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_ENCRYPT_EN;
> +
> + return 1;
> +}
> +
> +/**
> * ixgbe_ipsec_rx - decode ipsec bits from Rx descriptor
> * @rx_ring: receiving ring
> * @rx_desc: receive data descriptor
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c
> index f1bfae0..d7875b3 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c
> @@ -1261,7 +1261,7 @@ void ixgbe_clear_interrupt_scheme(struct ixgbe_adapter *adapter)
> }
>
> void ixgbe_tx_ctxtdesc(struct ixgbe_ring *tx_ring, u32 vlan_macip_lens,
> - u32 fcoe_sof_eof, u32 type_tucmd, u32 mss_l4len_idx)
> + u32 fceof_saidx, u32 type_tucmd, u32 mss_l4len_idx)
> {
> struct ixgbe_adv_tx_context_desc *context_desc;
> u16 i = tx_ring->next_to_use;
> @@ -1275,7 +1275,7 @@ void ixgbe_tx_ctxtdesc(struct ixgbe_ring *tx_ring, u32 vlan_macip_lens,
> type_tucmd |= IXGBE_TXD_CMD_DEXT | IXGBE_ADVTXD_DTYP_CTXT;
>
> context_desc->vlan_macip_lens = cpu_to_le32(vlan_macip_lens);
> - context_desc->seqnum_seed = cpu_to_le32(fcoe_sof_eof);
> + context_desc->fceof_saidx = cpu_to_le32(fceof_saidx);
> context_desc->type_tucmd_mlhl = cpu_to_le32(type_tucmd);
> context_desc->mss_l4len_idx = cpu_to_le32(mss_l4len_idx);
> }
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> index 0ee1e5e..6b9a9b2 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> @@ -7756,10 +7756,12 @@ static inline bool ixgbe_ipv6_csum_is_sctp(struct sk_buff *skb)
> }
>
> static void ixgbe_tx_csum(struct ixgbe_ring *tx_ring,
> - struct ixgbe_tx_buffer *first)
> + struct ixgbe_tx_buffer *first,
> + struct ixgbe_ipsec_tx_data *itd)
> {
> struct sk_buff *skb = first->skb;
> u32 vlan_macip_lens = 0;
> + u32 fceof_saidx = 0;
> u32 type_tucmd = 0;
>
> if (skb->ip_summed != CHECKSUM_PARTIAL) {
> @@ -7800,7 +7802,12 @@ static void ixgbe_tx_csum(struct ixgbe_ring *tx_ring,
> vlan_macip_lens |= skb_network_offset(skb) << IXGBE_ADVTXD_MACLEN_SHIFT;
> vlan_macip_lens |= first->tx_flags & IXGBE_TX_FLAGS_VLAN_MASK;
>
> - ixgbe_tx_ctxtdesc(tx_ring, vlan_macip_lens, 0, type_tucmd, 0);
> + if (first->tx_flags & IXGBE_TX_FLAGS_IPSEC) {
> + fceof_saidx |= itd->sa_idx;
> + type_tucmd |= itd->flags | itd->trailer_len;
> + }
> +
> + ixgbe_tx_ctxtdesc(tx_ring, vlan_macip_lens, fceof_saidx, type_tucmd, 0);
> }
>
> #define IXGBE_SET_FLAG(_input, _flag, _result) \
> @@ -7843,11 +7850,16 @@ static void ixgbe_tx_olinfo_status(union ixgbe_adv_tx_desc *tx_desc,
> IXGBE_TX_FLAGS_CSUM,
> IXGBE_ADVTXD_POPTS_TXSM);
>
> - /* enble IPv4 checksum for TSO */
> + /* enable IPv4 checksum for TSO */
> olinfo_status |= IXGBE_SET_FLAG(tx_flags,
> IXGBE_TX_FLAGS_IPV4,
> IXGBE_ADVTXD_POPTS_IXSM);
>
> + /* enable IPsec */
> + olinfo_status |= IXGBE_SET_FLAG(tx_flags,
> + IXGBE_TX_FLAGS_IPSEC,
> + IXGBE_ADVTXD_POPTS_IPSEC);
> +
> /*
> * Check Context must be set if Tx switch is enabled, which it
> * always is for case where virtual functions are running
> @@ -8306,6 +8318,7 @@ netdev_tx_t ixgbe_xmit_frame_ring(struct sk_buff *skb,
> u32 tx_flags = 0;
> unsigned short f;
> u16 count = TXD_USE_COUNT(skb_headlen(skb));
> + struct ixgbe_ipsec_tx_data ipsec_tx = { 0 };
> __be16 protocol = skb->protocol;
> u8 hdr_len = 0;
>
> @@ -8410,11 +8423,16 @@ netdev_tx_t ixgbe_xmit_frame_ring(struct sk_buff *skb,
> }
>
> #endif /* IXGBE_FCOE */
> +
> +#ifdef CONFIG_XFRM_OFFLOAD
> + if (skb->sp && !ixgbe_ipsec_tx(tx_ring, first, &ipsec_tx))
> + goto out_drop;
> +#endif
> tso = ixgbe_tso(tx_ring, first, &hdr_len);
> if (tso < 0)
> goto out_drop;
> else if (!tso)
> - ixgbe_tx_csum(tx_ring, first);
> + ixgbe_tx_csum(tx_ring, first, &ipsec_tx);
>
> /* add the ATR filter if ATR is on */
> if (test_bit(__IXGBE_TX_FDIR_INIT_DONE, &tx_ring->state))
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
> index 3df0763..0ac725fa 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
> @@ -2856,7 +2856,7 @@ union ixgbe_adv_rx_desc {
> /* Context descriptors */
> struct ixgbe_adv_tx_context_desc {
> __le32 vlan_macip_lens;
> - __le32 seqnum_seed;
> + __le32 fceof_saidx;
> __le32 type_tucmd_mlhl;
> __le32 mss_l4len_idx;
> };
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