#include "accel/ipsec_offload.h"
#include "en_accel/ipsec_rxtx.h"
#include "en_accel/ipsec.h"
-#include "accel/accel.h"
#include "en.h"
-enum {
- MLX5E_IPSEC_RX_SYNDROME_DECRYPTED = 0x11,
- MLX5E_IPSEC_RX_SYNDROME_AUTH_FAILED = 0x12,
- MLX5E_IPSEC_RX_SYNDROME_BAD_PROTO = 0x17,
-};
-
-struct mlx5e_ipsec_rx_metadata {
- unsigned char nexthdr;
- __be32 sa_handle;
-} __packed;
-
enum {
MLX5E_IPSEC_TX_SYNDROME_OFFLOAD = 0x8,
MLX5E_IPSEC_TX_SYNDROME_OFFLOAD_WITH_LSO_TCP = 0x9,
};
-struct mlx5e_ipsec_tx_metadata {
- __be16 mss_inv; /* 1/MSS in 16bit fixed point, only for LSO */
- __be16 seq; /* LSBs of the first TCP seq, only for LSO */
- u8 esp_next_proto; /* Next protocol of ESP */
-} __packed;
-
-struct mlx5e_ipsec_metadata {
- unsigned char syndrome;
- union {
- unsigned char raw[5];
- /* from FPGA to host, on successful decrypt */
- struct mlx5e_ipsec_rx_metadata rx;
- /* from host to FPGA */
- struct mlx5e_ipsec_tx_metadata tx;
- } __packed content;
- /* packet type ID field */
- __be16 ethertype;
-} __packed;
-
-#define MAX_LSO_MSS 2048
-
-/* Pre-calculated (Q0.16) fixed-point inverse 1/x function */
-static __be16 mlx5e_ipsec_inverse_table[MAX_LSO_MSS];
-
-static inline __be16 mlx5e_ipsec_mss_inv(struct sk_buff *skb)
-{
- return mlx5e_ipsec_inverse_table[skb_shinfo(skb)->gso_size];
-}
-
-static struct mlx5e_ipsec_metadata *mlx5e_ipsec_add_metadata(struct sk_buff *skb)
-{
- struct mlx5e_ipsec_metadata *mdata;
- struct ethhdr *eth;
-
- if (unlikely(skb_cow_head(skb, sizeof(*mdata))))
- return ERR_PTR(-ENOMEM);
-
- eth = (struct ethhdr *)skb_push(skb, sizeof(*mdata));
- skb->mac_header -= sizeof(*mdata);
- mdata = (struct mlx5e_ipsec_metadata *)(eth + 1);
-
- memmove(skb->data, skb->data + sizeof(*mdata),
- 2 * ETH_ALEN);
-
- eth->h_proto = cpu_to_be16(MLX5E_METADATA_ETHER_TYPE);
-
- memset(mdata->content.raw, 0, sizeof(mdata->content.raw));
- return mdata;
-}
-
static int mlx5e_ipsec_remove_trailer(struct sk_buff *skb, struct xfrm_state *x)
{
unsigned int alen = crypto_aead_authsize(x->data);
skb_store_bits(skb, iv_offset, &seqno, 8);
}
-static void mlx5e_ipsec_set_metadata(struct sk_buff *skb,
- struct mlx5e_ipsec_metadata *mdata,
- struct xfrm_offload *xo)
-{
- struct ip_esp_hdr *esph;
- struct tcphdr *tcph;
-
- if (skb_is_gso(skb)) {
- /* Add LSO metadata indication */
- esph = ip_esp_hdr(skb);
- tcph = inner_tcp_hdr(skb);
- netdev_dbg(skb->dev, " Offloading GSO packet outer L3 %u; L4 %u; Inner L3 %u; L4 %u\n",
- skb->network_header,
- skb->transport_header,
- skb->inner_network_header,
- skb->inner_transport_header);
- netdev_dbg(skb->dev, " Offloading GSO packet of len %u; mss %u; TCP sp %u dp %u seq 0x%x ESP seq 0x%x\n",
- skb->len, skb_shinfo(skb)->gso_size,
- ntohs(tcph->source), ntohs(tcph->dest),
- ntohl(tcph->seq), ntohl(esph->seq_no));
- mdata->syndrome = MLX5E_IPSEC_TX_SYNDROME_OFFLOAD_WITH_LSO_TCP;
- mdata->content.tx.mss_inv = mlx5e_ipsec_mss_inv(skb);
- mdata->content.tx.seq = htons(ntohl(tcph->seq) & 0xFFFF);
- } else {
- mdata->syndrome = MLX5E_IPSEC_TX_SYNDROME_OFFLOAD;
- }
- mdata->content.tx.esp_next_proto = xo->proto;
-
- netdev_dbg(skb->dev, " TX metadata syndrome %u proto %u mss_inv %04x seq %04x\n",
- mdata->syndrome, mdata->content.tx.esp_next_proto,
- ntohs(mdata->content.tx.mss_inv),
- ntohs(mdata->content.tx.seq));
-}
-
void mlx5e_ipsec_handle_tx_wqe(struct mlx5e_tx_wqe *wqe,
struct mlx5e_accel_tx_ipsec_state *ipsec_st,
struct mlx5_wqe_inline_seg *inlseg)
struct mlx5e_priv *priv = netdev_priv(netdev);
struct xfrm_offload *xo = xfrm_offload(skb);
struct mlx5e_ipsec_sa_entry *sa_entry;
- struct mlx5e_ipsec_metadata *mdata;
struct xfrm_state *x;
struct sec_path *sp;
goto drop;
}
- if (MLX5_CAP_GEN(priv->mdev, fpga)) {
- mdata = mlx5e_ipsec_add_metadata(skb);
- if (IS_ERR(mdata)) {
- atomic64_inc(&priv->ipsec->sw_stats.ipsec_tx_drop_metadata);
- goto drop;
- }
- }
-
sa_entry = (struct mlx5e_ipsec_sa_entry *)x->xso.offload_handle;
sa_entry->set_iv_op(skb, x, xo);
- if (MLX5_CAP_GEN(priv->mdev, fpga))
- mlx5e_ipsec_set_metadata(skb, mdata, xo);
-
mlx5e_ipsec_set_state(priv, skb, x, xo, ipsec_st);
return true;
return false;
}
-static inline struct xfrm_state *
-mlx5e_ipsec_build_sp(struct net_device *netdev, struct sk_buff *skb,
- struct mlx5e_ipsec_metadata *mdata)
-{
- struct mlx5e_priv *priv = netdev_priv(netdev);
- struct xfrm_offload *xo;
- struct xfrm_state *xs;
- struct sec_path *sp;
- u32 sa_handle;
-
- sp = secpath_set(skb);
- if (unlikely(!sp)) {
- atomic64_inc(&priv->ipsec->sw_stats.ipsec_rx_drop_sp_alloc);
- return NULL;
- }
-
- sa_handle = be32_to_cpu(mdata->content.rx.sa_handle);
- xs = mlx5e_ipsec_sadb_rx_lookup(priv->ipsec, sa_handle);
- if (unlikely(!xs)) {
- atomic64_inc(&priv->ipsec->sw_stats.ipsec_rx_drop_sadb_miss);
- return NULL;
- }
-
- sp = skb_sec_path(skb);
- sp->xvec[sp->len++] = xs;
- sp->olen++;
-
- xo = xfrm_offload(skb);
- xo->flags = CRYPTO_DONE;
- switch (mdata->syndrome) {
- case MLX5E_IPSEC_RX_SYNDROME_DECRYPTED:
- xo->status = CRYPTO_SUCCESS;
- if (likely(priv->ipsec->no_trailer)) {
- xo->flags |= XFRM_ESP_NO_TRAILER;
- xo->proto = mdata->content.rx.nexthdr;
- }
- break;
- case MLX5E_IPSEC_RX_SYNDROME_AUTH_FAILED:
- xo->status = CRYPTO_TUNNEL_ESP_AUTH_FAILED;
- break;
- case MLX5E_IPSEC_RX_SYNDROME_BAD_PROTO:
- xo->status = CRYPTO_INVALID_PROTOCOL;
- break;
- default:
- atomic64_inc(&priv->ipsec->sw_stats.ipsec_rx_drop_syndrome);
- return NULL;
- }
- return xs;
-}
-
-struct sk_buff *mlx5e_ipsec_handle_rx_skb(struct net_device *netdev,
- struct sk_buff *skb, u32 *cqe_bcnt)
-{
- struct mlx5e_ipsec_metadata *mdata;
- struct xfrm_state *xs;
-
- if (!is_metadata_hdr_valid(skb))
- return skb;
-
- /* Use the metadata */
- mdata = (struct mlx5e_ipsec_metadata *)(skb->data + ETH_HLEN);
- xs = mlx5e_ipsec_build_sp(netdev, skb, mdata);
- if (unlikely(!xs)) {
- kfree_skb(skb);
- return NULL;
- }
-
- remove_metadata_hdr(skb);
- *cqe_bcnt -= MLX5E_METADATA_ETHER_LEN;
-
- return skb;
-}
-
enum {
MLX5E_IPSEC_OFFLOAD_RX_SYNDROME_DECRYPTED,
MLX5E_IPSEC_OFFLOAD_RX_SYNDROME_AUTH_FAILED,
atomic64_inc(&priv->ipsec->sw_stats.ipsec_rx_drop_syndrome);
}
}
-
-void mlx5e_ipsec_build_inverse_table(void)
-{
- u16 mss_inv;
- u32 mss;
-
- /* Calculate 1/x inverse table for use in GSO data path.
- * Using this table, we provide the IPSec accelerator with the value of
- * 1/gso_size so that it can infer the position of each segment inside
- * the GSO, and increment the ESP sequence number, and generate the IV.
- * The HW needs this value in Q0.16 fixed-point number format
- */
- mlx5e_ipsec_inverse_table[1] = htons(0xFFFF);
- for (mss = 2; mss < MAX_LSO_MSS; mss++) {
- mss_inv = div_u64(1ULL << 32, mss) >> 16;
- mlx5e_ipsec_inverse_table[mss] = htons(mss_inv);
- }
-}
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