net/mlx5e: Add support for XDP_REDIRECT in device-out side
authorTariq Toukan <tariqt@mellanox.com>
Tue, 22 May 2018 13:48:48 +0000 (16:48 +0300)
committerSaeed Mahameed <saeedm@mellanox.com>
Thu, 26 Jul 2018 22:23:57 +0000 (15:23 -0700)
Add implementation for the ndo_xdp_xmit callback.

Dedicate a new set of XDP-SQ instances to satisfy the XDP_REDIRECT
requests.  These instances are totally separated from the existing
XDP-SQ objects that satisfy local XDP_TX actions.

Performance tests:

xdp_redirect_map from ConnectX-5 to ConnectX-5.
CPU: Intel(R) Xeon(R) CPU E5-2680 v3 @ 2.50GHz
Packet-rate of 64B packets.

Single queue: 7 Mpps.
Multi queue: 55 Mpps.

Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Eugenia Emantayev <eugenia@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
drivers/net/ethernet/mellanox/mlx5/core/en.h
drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h
drivers/net/ethernet/mellanox/mlx5/core/en_main.c
drivers/net/ethernet/mellanox/mlx5/core/en_stats.c
drivers/net/ethernet/mellanox/mlx5/core/en_stats.h
drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c

index 16e219a8f240707ec72c0223269d238dfd1ca029..3f21cafe6be35e862ab44df3c253774593cacb1e 100644 (file)
@@ -344,6 +344,7 @@ enum {
        MLX5E_SQ_STATE_IPSEC,
        MLX5E_SQ_STATE_AM,
        MLX5E_SQ_STATE_TLS,
+       MLX5E_SQ_STATE_REDIRECT,
 };
 
 struct mlx5e_sq_wqe_info {
@@ -598,6 +599,9 @@ struct mlx5e_channel {
        __be32                     mkey_be;
        u8                         num_tc;
 
+       /* XDP_REDIRECT */
+       struct mlx5e_xdpsq         xdpsq;
+
        /* data path - accessed per napi poll */
        struct irq_desc *irq_desc;
        struct mlx5e_ch_stats     *stats;
@@ -621,6 +625,7 @@ struct mlx5e_channel_stats {
        struct mlx5e_sq_stats sq[MLX5E_MAX_NUM_TC];
        struct mlx5e_rq_stats rq;
        struct mlx5e_xdpsq_stats rq_xdpsq;
+       struct mlx5e_xdpsq_stats xdpsq;
 } ____cacheline_aligned_in_smp;
 
 enum mlx5e_traffic_types {
index eabd5537927d7de103bd1c38d90bb09bd62310f4..bab8cd44d1c5bde8610d92100004ca6e43ed1d29 100644 (file)
@@ -167,6 +167,7 @@ bool mlx5e_poll_xdpsq_cq(struct mlx5e_cq *cq)
        struct mlx5e_xdpsq *sq;
        struct mlx5_cqe64 *cqe;
        struct mlx5e_rq *rq;
+       bool is_redirect;
        u16 sqcc;
        int i;
 
@@ -179,6 +180,7 @@ bool mlx5e_poll_xdpsq_cq(struct mlx5e_cq *cq)
        if (!cqe)
                return false;
 
+       is_redirect = test_bit(MLX5E_SQ_STATE_REDIRECT, &sq->state);
        rq = container_of(sq, struct mlx5e_rq, xdpsq);
 
        /* sq->cc must be updated only after mlx5_cqwq_update_db_record(),
@@ -196,17 +198,20 @@ bool mlx5e_poll_xdpsq_cq(struct mlx5e_cq *cq)
                wqe_counter = be16_to_cpu(cqe->wqe_counter);
 
                do {
-                       struct mlx5e_xdp_info *xdpi;
-                       u16 ci;
+                       u16 ci = mlx5_wq_cyc_ctr2ix(&sq->wq, sqcc);
+                       struct mlx5e_xdp_info *xdpi = &sq->db.xdpi[ci];
 
                        last_wqe = (sqcc == wqe_counter);
-
-                       ci = mlx5_wq_cyc_ctr2ix(&sq->wq, sqcc);
-                       xdpi = &sq->db.xdpi[ci];
-
                        sqcc++;
-                       /* Recycle RX page */
-                       mlx5e_page_release(rq, &xdpi->di, true);
+
+                       if (is_redirect) {
+                               xdp_return_frame(xdpi->xdpf);
+                               dma_unmap_single(sq->pdev, xdpi->dma_addr,
+                                                xdpi->xdpf->len, DMA_TO_DEVICE);
+                       } else {
+                               /* Recycle RX page */
+                               mlx5e_page_release(rq, &xdpi->di, true);
+                       }
                } while (!last_wqe);
        } while ((++i < MLX5E_TX_CQ_POLL_BUDGET) && (cqe = mlx5_cqwq_get_cqe(&cq->wq)));
 
@@ -223,16 +228,75 @@ bool mlx5e_poll_xdpsq_cq(struct mlx5e_cq *cq)
 
 void mlx5e_free_xdpsq_descs(struct mlx5e_xdpsq *sq)
 {
-       struct mlx5e_rq *rq = container_of(sq, struct mlx5e_rq, xdpsq);
-       struct mlx5e_xdp_info *xdpi;
-       u16 ci;
+       struct mlx5e_rq *rq;
+       bool is_redirect;
+
+       is_redirect = test_bit(MLX5E_SQ_STATE_REDIRECT, &sq->state);
+       rq = is_redirect ? NULL : container_of(sq, struct mlx5e_rq, xdpsq);
 
        while (sq->cc != sq->pc) {
-               ci = mlx5_wq_cyc_ctr2ix(&sq->wq, sq->cc);
-               xdpi = &sq->db.xdpi[ci];
+               u16 ci = mlx5_wq_cyc_ctr2ix(&sq->wq, sq->cc);
+               struct mlx5e_xdp_info *xdpi = &sq->db.xdpi[ci];
+
                sq->cc++;
 
-               mlx5e_page_release(rq, &xdpi->di, false);
+               if (is_redirect) {
+                       xdp_return_frame(xdpi->xdpf);
+                       dma_unmap_single(sq->pdev, xdpi->dma_addr,
+                                        xdpi->xdpf->len, DMA_TO_DEVICE);
+               } else {
+                       /* Recycle RX page */
+                       mlx5e_page_release(rq, &xdpi->di, false);
+               }
        }
 }
 
+int mlx5e_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
+                  u32 flags)
+{
+       struct mlx5e_priv *priv = netdev_priv(dev);
+       struct mlx5e_xdpsq *sq;
+       int drops = 0;
+       int sq_num;
+       int i;
+
+       if (unlikely(!test_bit(MLX5E_STATE_OPENED, &priv->state)))
+               return -ENETDOWN;
+
+       if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
+               return -EINVAL;
+
+       sq_num = smp_processor_id();
+
+       if (unlikely(sq_num >= priv->channels.num))
+               return -ENXIO;
+
+       sq = &priv->channels.c[sq_num]->xdpsq;
+
+       if (unlikely(!test_bit(MLX5E_SQ_STATE_ENABLED, &sq->state)))
+               return -ENETDOWN;
+
+       for (i = 0; i < n; i++) {
+               struct xdp_frame *xdpf = frames[i];
+               struct mlx5e_xdp_info xdpi;
+
+               xdpi.dma_addr = dma_map_single(sq->pdev, xdpf->data, xdpf->len,
+                                              DMA_TO_DEVICE);
+               if (unlikely(dma_mapping_error(sq->pdev, xdpi.dma_addr))) {
+                       drops++;
+                       continue;
+               }
+
+               xdpi.xdpf = xdpf;
+
+               if (unlikely(!mlx5e_xmit_xdp_frame(sq, &xdpi))) {
+                       xdp_return_frame_rx_napi(xdpf);
+                       drops++;
+               }
+       }
+
+       if (flags & XDP_XMIT_FLUSH)
+               mlx5e_xmit_xdp_doorbell(sq);
+
+       return n - drops;
+}
index 81739aad01886950c4fc5bf6f2e70d14ad93bf5b..6dfab045925f01564b50e47c0340cdc04b4a602f 100644 (file)
@@ -46,6 +46,8 @@ bool mlx5e_poll_xdpsq_cq(struct mlx5e_cq *cq);
 void mlx5e_free_xdpsq_descs(struct mlx5e_xdpsq *sq);
 
 bool mlx5e_xmit_xdp_frame(struct mlx5e_xdpsq *sq, struct mlx5e_xdp_info *xdpi);
+int mlx5e_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
+                  u32 flags);
 
 static inline void mlx5e_xmit_xdp_doorbell(struct mlx5e_xdpsq *sq)
 {
index 5a6c4403a3e22a0ff1b4f8456e0eab572bb15c11..fad947079a43f45bc9680742d89df3d4d524833f 100644 (file)
@@ -988,7 +988,8 @@ static int mlx5e_alloc_xdpsq_db(struct mlx5e_xdpsq *sq, int numa)
 static int mlx5e_alloc_xdpsq(struct mlx5e_channel *c,
                             struct mlx5e_params *params,
                             struct mlx5e_sq_param *param,
-                            struct mlx5e_xdpsq *sq)
+                            struct mlx5e_xdpsq *sq,
+                            bool is_redirect)
 {
        void *sqc_wq               = MLX5_ADDR_OF(sqc, param->sqc, wq);
        struct mlx5_core_dev *mdev = c->mdev;
@@ -1001,7 +1002,9 @@ static int mlx5e_alloc_xdpsq(struct mlx5e_channel *c,
        sq->uar_map   = mdev->mlx5e_res.bfreg.map;
        sq->min_inline_mode = params->tx_min_inline_mode;
        sq->hw_mtu    = MLX5E_SW2HW_MTU(params, params->sw_mtu);
-       sq->stats     = &c->priv->channel_stats[c->ix].rq_xdpsq;
+       sq->stats     = is_redirect ?
+               &c->priv->channel_stats[c->ix].xdpsq :
+               &c->priv->channel_stats[c->ix].rq_xdpsq;
 
        param->wq.db_numa_node = cpu_to_node(c->cpu);
        err = mlx5_wq_cyc_create(mdev, &param->wq, sqc_wq, wq, &sq->wq_ctrl);
@@ -1531,7 +1534,8 @@ static void mlx5e_close_icosq(struct mlx5e_icosq *sq)
 static int mlx5e_open_xdpsq(struct mlx5e_channel *c,
                            struct mlx5e_params *params,
                            struct mlx5e_sq_param *param,
-                           struct mlx5e_xdpsq *sq)
+                           struct mlx5e_xdpsq *sq,
+                           bool is_redirect)
 {
        unsigned int ds_cnt = MLX5E_XDP_TX_DS_COUNT;
        struct mlx5e_create_sq_param csp = {};
@@ -1539,7 +1543,7 @@ static int mlx5e_open_xdpsq(struct mlx5e_channel *c,
        int err;
        int i;
 
-       err = mlx5e_alloc_xdpsq(c, params, param, sq);
+       err = mlx5e_alloc_xdpsq(c, params, param, sq, is_redirect);
        if (err)
                return err;
 
@@ -1548,6 +1552,8 @@ static int mlx5e_open_xdpsq(struct mlx5e_channel *c,
        csp.cqn             = sq->cq.mcq.cqn;
        csp.wq_ctrl         = &sq->wq_ctrl;
        csp.min_inline_mode = sq->min_inline_mode;
+       if (is_redirect)
+               set_bit(MLX5E_SQ_STATE_REDIRECT, &sq->state);
        set_bit(MLX5E_SQ_STATE_ENABLED, &sq->state);
        err = mlx5e_create_sq_rdy(c->mdev, param, &csp, &sq->sqn);
        if (err)
@@ -1930,10 +1936,14 @@ static int mlx5e_open_channel(struct mlx5e_priv *priv, int ix,
        if (err)
                goto err_close_icosq_cq;
 
-       err = mlx5e_open_cq(c, params->rx_cq_moderation, &cparam->rx_cq, &c->rq.cq);
+       err = mlx5e_open_cq(c, params->tx_cq_moderation, &cparam->tx_cq, &c->xdpsq.cq);
        if (err)
                goto err_close_tx_cqs;
 
+       err = mlx5e_open_cq(c, params->rx_cq_moderation, &cparam->rx_cq, &c->rq.cq);
+       if (err)
+               goto err_close_xdp_tx_cqs;
+
        /* XDP SQ CQ params are same as normal TXQ sq CQ params */
        err = c->xdp ? mlx5e_open_cq(c, params->tx_cq_moderation,
                                     &cparam->tx_cq, &c->rq.xdpsq.cq) : 0;
@@ -1950,7 +1960,7 @@ static int mlx5e_open_channel(struct mlx5e_priv *priv, int ix,
        if (err)
                goto err_close_icosq;
 
-       err = c->xdp ? mlx5e_open_xdpsq(c, params, &cparam->xdp_sq, &c->rq.xdpsq) : 0;
+       err = c->xdp ? mlx5e_open_xdpsq(c, params, &cparam->xdp_sq, &c->rq.xdpsq, false) : 0;
        if (err)
                goto err_close_sqs;
 
@@ -1958,9 +1968,17 @@ static int mlx5e_open_channel(struct mlx5e_priv *priv, int ix,
        if (err)
                goto err_close_xdp_sq;
 
+       err = mlx5e_open_xdpsq(c, params, &cparam->xdp_sq, &c->xdpsq, true);
+       if (err)
+               goto err_close_rq;
+
        *cp = c;
 
        return 0;
+
+err_close_rq:
+       mlx5e_close_rq(&c->rq);
+
 err_close_xdp_sq:
        if (c->xdp)
                mlx5e_close_xdpsq(&c->rq.xdpsq);
@@ -1979,6 +1997,9 @@ err_disable_napi:
 err_close_rx_cq:
        mlx5e_close_cq(&c->rq.cq);
 
+err_close_xdp_tx_cqs:
+       mlx5e_close_cq(&c->xdpsq.cq);
+
 err_close_tx_cqs:
        mlx5e_close_tx_cqs(c);
 
@@ -2013,6 +2034,7 @@ static void mlx5e_deactivate_channel(struct mlx5e_channel *c)
 
 static void mlx5e_close_channel(struct mlx5e_channel *c)
 {
+       mlx5e_close_xdpsq(&c->xdpsq);
        mlx5e_close_rq(&c->rq);
        if (c->xdp)
                mlx5e_close_xdpsq(&c->rq.xdpsq);
@@ -2022,6 +2044,7 @@ static void mlx5e_close_channel(struct mlx5e_channel *c)
        if (c->xdp)
                mlx5e_close_cq(&c->rq.xdpsq.cq);
        mlx5e_close_cq(&c->rq.cq);
+       mlx5e_close_cq(&c->xdpsq.cq);
        mlx5e_close_tx_cqs(c);
        mlx5e_close_cq(&c->icosq.cq);
        netif_napi_del(&c->napi);
@@ -4278,6 +4301,7 @@ static const struct net_device_ops mlx5e_netdev_ops = {
 #endif
        .ndo_tx_timeout          = mlx5e_tx_timeout,
        .ndo_bpf                 = mlx5e_xdp,
+       .ndo_xdp_xmit            = mlx5e_xdp_xmit,
 #ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller     = mlx5e_netpoll,
 #endif
index 85b1827b76c60dfdaec68a0531ba83b4df4424ba..12fdf5c92b67f7c8a32f5567ca6784b30145f699 100644 (file)
@@ -75,6 +75,10 @@ static const struct counter_desc sw_stats_desc[] = {
        { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, tx_queue_wake) },
        { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, tx_udp_seg_rem) },
        { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, tx_cqe_err) },
+       { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, tx_xdp_xmit) },
+       { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, tx_xdp_full) },
+       { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, tx_xdp_err) },
+       { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, tx_xdp_cqes) },
        { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_wqe_err) },
        { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_mpwqe_filler_cqes) },
        { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_mpwqe_filler_strides) },
@@ -130,6 +134,7 @@ void mlx5e_grp_sw_update_stats(struct mlx5e_priv *priv)
        for (i = 0; i < priv->profile->max_nch(priv->mdev); i++) {
                struct mlx5e_channel_stats *channel_stats =
                        &priv->channel_stats[i];
+               struct mlx5e_xdpsq_stats *xdpsq_red_stats = &channel_stats->xdpsq;
                struct mlx5e_xdpsq_stats *xdpsq_stats = &channel_stats->rq_xdpsq;
                struct mlx5e_rq_stats *rq_stats = &channel_stats->rq;
                struct mlx5e_ch_stats *ch_stats = &channel_stats->ch;
@@ -168,6 +173,11 @@ void mlx5e_grp_sw_update_stats(struct mlx5e_priv *priv)
                s->ch_arm         += ch_stats->arm;
                s->ch_aff_change  += ch_stats->aff_change;
                s->ch_eq_rearm    += ch_stats->eq_rearm;
+               /* xdp redirect */
+               s->tx_xdp_xmit    += xdpsq_red_stats->xmit;
+               s->tx_xdp_full    += xdpsq_red_stats->full;
+               s->tx_xdp_err     += xdpsq_red_stats->err;
+               s->tx_xdp_cqes    += xdpsq_red_stats->cqes;
 
                for (j = 0; j < priv->max_opened_tc; j++) {
                        struct mlx5e_sq_stats *sq_stats = &channel_stats->sq[j];
@@ -1178,6 +1188,13 @@ static const struct counter_desc rq_xdpsq_stats_desc[] = {
        { MLX5E_DECLARE_RQ_XDPSQ_STAT(struct mlx5e_xdpsq_stats, cqes) },
 };
 
+static const struct counter_desc xdpsq_stats_desc[] = {
+       { MLX5E_DECLARE_XDPSQ_STAT(struct mlx5e_xdpsq_stats, xmit) },
+       { MLX5E_DECLARE_XDPSQ_STAT(struct mlx5e_xdpsq_stats, full) },
+       { MLX5E_DECLARE_XDPSQ_STAT(struct mlx5e_xdpsq_stats, err) },
+       { MLX5E_DECLARE_XDPSQ_STAT(struct mlx5e_xdpsq_stats, cqes) },
+};
+
 static const struct counter_desc ch_stats_desc[] = {
        { MLX5E_DECLARE_CH_STAT(struct mlx5e_ch_stats, events) },
        { MLX5E_DECLARE_CH_STAT(struct mlx5e_ch_stats, poll) },
@@ -1188,6 +1205,7 @@ static const struct counter_desc ch_stats_desc[] = {
 
 #define NUM_RQ_STATS                   ARRAY_SIZE(rq_stats_desc)
 #define NUM_SQ_STATS                   ARRAY_SIZE(sq_stats_desc)
+#define NUM_XDPSQ_STATS                        ARRAY_SIZE(xdpsq_stats_desc)
 #define NUM_RQ_XDPSQ_STATS             ARRAY_SIZE(rq_xdpsq_stats_desc)
 #define NUM_CH_STATS                   ARRAY_SIZE(ch_stats_desc)
 
@@ -1198,7 +1216,8 @@ static int mlx5e_grp_channels_get_num_stats(struct mlx5e_priv *priv)
        return (NUM_RQ_STATS * max_nch) +
               (NUM_CH_STATS * max_nch) +
               (NUM_SQ_STATS * max_nch * priv->max_opened_tc) +
-              (NUM_RQ_XDPSQ_STATS * max_nch);
+              (NUM_RQ_XDPSQ_STATS * max_nch) +
+              (NUM_XDPSQ_STATS * max_nch);
 }
 
 static int mlx5e_grp_channels_fill_strings(struct mlx5e_priv *priv, u8 *data,
@@ -1228,6 +1247,11 @@ static int mlx5e_grp_channels_fill_strings(struct mlx5e_priv *priv, u8 *data,
                                        sq_stats_desc[j].format,
                                        priv->channel_tc2txq[i][tc]);
 
+       for (i = 0; i < max_nch; i++)
+               for (j = 0; j < NUM_XDPSQ_STATS; j++)
+                       sprintf(data + (idx++) * ETH_GSTRING_LEN,
+                               xdpsq_stats_desc[j].format, i);
+
        return idx;
 }
 
@@ -1261,6 +1285,12 @@ static int mlx5e_grp_channels_fill_stats(struct mlx5e_priv *priv, u64 *data,
                                        MLX5E_READ_CTR64_CPU(&priv->channel_stats[i].sq[tc],
                                                             sq_stats_desc, j);
 
+       for (i = 0; i < max_nch; i++)
+               for (j = 0; j < NUM_XDPSQ_STATS; j++)
+                       data[idx++] =
+                               MLX5E_READ_CTR64_CPU(&priv->channel_stats[i].xdpsq,
+                                                    xdpsq_stats_desc, j);
+
        return idx;
 }
 
index 7aa8ff389cdd610f1c58f3effdeee8a32f3c2d71..a4c035aedd46cfe2c64e24f02f64bf90bf809e46 100644 (file)
@@ -44,6 +44,7 @@
 #define MLX5E_DECLARE_STAT(type, fld) #fld, offsetof(type, fld)
 #define MLX5E_DECLARE_RX_STAT(type, fld) "rx%d_"#fld, offsetof(type, fld)
 #define MLX5E_DECLARE_TX_STAT(type, fld) "tx%d_"#fld, offsetof(type, fld)
+#define MLX5E_DECLARE_XDPSQ_STAT(type, fld) "tx%d_xdp_"#fld, offsetof(type, fld)
 #define MLX5E_DECLARE_RQ_XDPSQ_STAT(type, fld) "rx%d_xdp_tx_"#fld, offsetof(type, fld)
 #define MLX5E_DECLARE_CH_STAT(type, fld) "ch%d_"#fld, offsetof(type, fld)
 
@@ -87,6 +88,10 @@ struct mlx5e_sw_stats {
        u64 tx_queue_wake;
        u64 tx_udp_seg_rem;
        u64 tx_cqe_err;
+       u64 tx_xdp_xmit;
+       u64 tx_xdp_full;
+       u64 tx_xdp_err;
+       u64 tx_xdp_cqes;
        u64 rx_wqe_err;
        u64 rx_mpwqe_filler_cqes;
        u64 rx_mpwqe_filler_strides;
index f31bbbe1bdb174b8f2f127973ee02e351768867c..85d51736015729267573436b35630acc4f0897b0 100644 (file)
@@ -85,6 +85,8 @@ int mlx5e_napi_poll(struct napi_struct *napi, int budget)
        for (i = 0; i < c->num_tc; i++)
                busy |= mlx5e_poll_tx_cq(&c->sq[i].cq, budget);
 
+       busy |= mlx5e_poll_xdpsq_cq(&c->xdpsq.cq);
+
        if (c->xdp)
                busy |= mlx5e_poll_xdpsq_cq(&c->rq.xdpsq.cq);
 
@@ -117,6 +119,7 @@ int mlx5e_napi_poll(struct napi_struct *napi, int budget)
 
        mlx5e_cq_arm(&c->rq.cq);
        mlx5e_cq_arm(&c->icosq.cq);
+       mlx5e_cq_arm(&c->xdpsq.cq);
 
        return work_done;
 }