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32 #ifndef __MLX5_EN_XDP_H__
33 #define __MLX5_EN_XDP_H__
35 #include <linux/indirect_call_wrapper.h>
36 #include <net/xdp_sock.h>
41 #define MLX5E_XDP_MIN_INLINE (ETH_HLEN + VLAN_HLEN)
43 #define MLX5E_XDP_INLINE_WQE_MAX_DS_CNT 16
44 #define MLX5E_XDP_INLINE_WQE_SZ_THRSD \
45 (MLX5E_XDP_INLINE_WQE_MAX_DS_CNT * MLX5_SEND_WQE_DS - \
46 sizeof(struct mlx5_wqe_inline_seg))
48 struct mlx5e_xdp_buff {
50 struct mlx5_cqe64 *cqe;
54 /* XDP packets can be transmitted in different ways. On completion, we need to
55 * distinguish between them to clean up things in a proper way.
57 enum mlx5e_xdp_xmit_mode {
58 /* An xdp_frame was transmitted due to either XDP_REDIRECT from another
59 * device or XDP_TX from an XSK RQ. The frame has to be unmapped and
62 MLX5E_XDP_XMIT_MODE_FRAME,
64 /* The xdp_frame was created in place as a result of XDP_TX from a
65 * regular RQ. No DMA remapping happened, and the page belongs to us.
67 MLX5E_XDP_XMIT_MODE_PAGE,
69 /* No xdp_frame was created at all, the transmit happened from a UMEM
70 * page. The UMEM Completion Ring producer pointer has to be increased.
72 MLX5E_XDP_XMIT_MODE_XSK,
75 /* xmit_mode entry is pushed to the fifo per packet, followed by multiple
76 * entries, as follows:
78 * MLX5E_XDP_XMIT_MODE_FRAME:
79 * xdpf, dma_addr_1, dma_addr_2, ... , dma_addr_num.
80 * 'num' is derived from xdpf.
82 * MLX5E_XDP_XMIT_MODE_PAGE:
83 * num, page_1, page_2, ... , page_num.
85 * MLX5E_XDP_XMIT_MODE_XSK:
88 #define MLX5E_XDP_FIFO_ENTRIES2DS_MAX_RATIO 4
90 union mlx5e_xdp_info {
91 enum mlx5e_xdp_xmit_mode mode;
93 struct xdp_frame *xdpf;
101 struct xsk_tx_metadata_compl xsk_meta;
104 struct mlx5e_xsk_param;
105 int mlx5e_xdp_max_mtu(struct mlx5e_params *params, struct mlx5e_xsk_param *xsk);
106 bool mlx5e_xdp_handle(struct mlx5e_rq *rq,
107 struct bpf_prog *prog, struct mlx5e_xdp_buff *mlctx);
108 void mlx5e_xdp_mpwqe_complete(struct mlx5e_xdpsq *sq);
109 bool mlx5e_poll_xdpsq_cq(struct mlx5e_cq *cq);
110 void mlx5e_free_xdpsq_descs(struct mlx5e_xdpsq *sq);
111 void mlx5e_set_xmit_fp(struct mlx5e_xdpsq *sq, bool is_mpw);
112 void mlx5e_xdp_rx_poll_complete(struct mlx5e_rq *rq);
113 int mlx5e_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
116 extern const struct xdp_metadata_ops mlx5e_xdp_metadata_ops;
117 extern const struct xsk_tx_metadata_ops mlx5e_xsk_tx_metadata_ops;
119 INDIRECT_CALLABLE_DECLARE(bool mlx5e_xmit_xdp_frame_mpwqe(struct mlx5e_xdpsq *sq,
120 struct mlx5e_xmit_data *xdptxd,
122 struct xsk_tx_metadata *meta));
123 INDIRECT_CALLABLE_DECLARE(bool mlx5e_xmit_xdp_frame(struct mlx5e_xdpsq *sq,
124 struct mlx5e_xmit_data *xdptxd,
126 struct xsk_tx_metadata *meta));
127 INDIRECT_CALLABLE_DECLARE(int mlx5e_xmit_xdp_frame_check_mpwqe(struct mlx5e_xdpsq *sq));
128 INDIRECT_CALLABLE_DECLARE(int mlx5e_xmit_xdp_frame_check(struct mlx5e_xdpsq *sq));
130 static inline void mlx5e_xdp_tx_enable(struct mlx5e_priv *priv)
132 set_bit(MLX5E_STATE_XDP_TX_ENABLED, &priv->state);
134 if (priv->channels.params.xdp_prog)
135 set_bit(MLX5E_STATE_XDP_ACTIVE, &priv->state);
138 static inline void mlx5e_xdp_tx_disable(struct mlx5e_priv *priv)
140 if (priv->channels.params.xdp_prog)
141 clear_bit(MLX5E_STATE_XDP_ACTIVE, &priv->state);
143 clear_bit(MLX5E_STATE_XDP_TX_ENABLED, &priv->state);
144 /* Let other device's napi(s) and XSK wakeups see our new state. */
148 static inline bool mlx5e_xdp_tx_is_enabled(struct mlx5e_priv *priv)
150 return test_bit(MLX5E_STATE_XDP_TX_ENABLED, &priv->state);
153 static inline bool mlx5e_xdp_is_active(struct mlx5e_priv *priv)
155 return test_bit(MLX5E_STATE_XDP_ACTIVE, &priv->state);
158 static inline void mlx5e_xmit_xdp_doorbell(struct mlx5e_xdpsq *sq)
160 if (sq->doorbell_cseg) {
161 mlx5e_notify_hw(&sq->wq, sq->pc, sq->uar_map, sq->doorbell_cseg);
162 sq->doorbell_cseg = NULL;
166 /* Enable inline WQEs to shift some load from a congested HCA (HW) to
167 * a less congested cpu (SW).
169 static inline bool mlx5e_xdp_get_inline_state(struct mlx5e_xdpsq *sq, bool cur)
171 u16 outstanding = sq->xdpi_fifo_pc - sq->xdpi_fifo_cc;
173 #define MLX5E_XDP_INLINE_WATERMARK_LOW 10
174 #define MLX5E_XDP_INLINE_WATERMARK_HIGH 128
176 if (cur && outstanding <= MLX5E_XDP_INLINE_WATERMARK_LOW)
179 if (!cur && outstanding >= MLX5E_XDP_INLINE_WATERMARK_HIGH)
185 static inline bool mlx5e_xdp_mpwqe_is_full(struct mlx5e_tx_mpwqe *session, u8 max_sq_mpw_wqebbs)
187 if (session->inline_on)
188 return session->ds_count + MLX5E_XDP_INLINE_WQE_MAX_DS_CNT >
189 max_sq_mpw_wqebbs * MLX5_SEND_WQEBB_NUM_DS;
191 return mlx5e_tx_mpwqe_is_full(session, max_sq_mpw_wqebbs);
194 struct mlx5e_xdp_wqe_info {
200 mlx5e_xdp_mpwqe_add_dseg(struct mlx5e_xdpsq *sq,
201 struct mlx5e_xmit_data *xdptxd,
202 struct mlx5e_xdpsq_stats *stats)
204 struct mlx5e_tx_mpwqe *session = &sq->mpwqe;
205 struct mlx5_wqe_data_seg *dseg =
206 (struct mlx5_wqe_data_seg *)session->wqe + session->ds_count;
207 u32 dma_len = xdptxd->len;
209 session->pkt_count++;
210 session->bytes_count += dma_len;
212 if (session->inline_on && dma_len <= MLX5E_XDP_INLINE_WQE_SZ_THRSD) {
213 struct mlx5_wqe_inline_seg *inline_dseg =
214 (struct mlx5_wqe_inline_seg *)dseg;
215 u16 ds_len = sizeof(*inline_dseg) + dma_len;
216 u16 ds_cnt = DIV_ROUND_UP(ds_len, MLX5_SEND_WQE_DS);
218 inline_dseg->byte_count = cpu_to_be32(dma_len | MLX5_INLINE_SEG);
219 memcpy(inline_dseg->data, xdptxd->data, dma_len);
221 session->ds_count += ds_cnt;
226 dseg->addr = cpu_to_be64(xdptxd->dma_addr);
227 dseg->byte_count = cpu_to_be32(dma_len);
228 dseg->lkey = sq->mkey_be;
233 mlx5e_xdpi_fifo_push(struct mlx5e_xdp_info_fifo *fifo,
234 union mlx5e_xdp_info xi)
236 u32 i = (*fifo->pc)++ & fifo->mask;
241 static inline union mlx5e_xdp_info
242 mlx5e_xdpi_fifo_pop(struct mlx5e_xdp_info_fifo *fifo)
244 return fifo->xi[(*fifo->cc)++ & fifo->mask];