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Date: Fri, 8 May 2020 15:40:29 +0000
From: Ioana Ciornei <ioana.ciornei@....com>
To: "davem@...emloft.net" <davem@...emloft.net>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC: "hawk@...nel.org" <hawk@...nel.org>
Subject: RE: [PATCH net-next 2/2] dpaa2-eth: add bulking to XDP_TX
> Subject: [PATCH net-next 2/2] dpaa2-eth: add bulking to XDP_TX
>
> Add driver level bulking to the XDP_TX action.
>
> An array of frame descriptors is held for each Tx frame queue and populated
> accordingly when the action returned by the XDP program is XDP_TX. The frames
> will be actually enqueued only when the array is filled. At the end of the NAPI
> cycle a flush on the queued frames is performed in order to enqueue the
> remaining FDs.
>
> Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
Hi,
I saw that only patch 1/2 was applied on net-next. Should I send a v2 with just this patch?
Thanks,
Ioana
> ---
> .../net/ethernet/freescale/dpaa2/dpaa2-eth.c | 68 ++++++++++++-------
> .../net/ethernet/freescale/dpaa2/dpaa2-eth.h | 1 +
> 2 files changed, 46 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
> b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
> index 0f3e842a4fd6..b1c64288a1fb 100644
> --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
> +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
> @@ -273,13 +273,43 @@ static int dpaa2_eth_xdp_flush(struct dpaa2_eth_priv
> *priv,
> return total_enqueued;
> }
>
> -static int xdp_enqueue(struct dpaa2_eth_priv *priv, struct dpaa2_fd *fd,
> - void *buf_start, u16 queue_id)
> +static void xdp_tx_flush(struct dpaa2_eth_priv *priv,
> + struct dpaa2_eth_channel *ch,
> + struct dpaa2_eth_fq *fq)
> +{
> + struct rtnl_link_stats64 *percpu_stats;
> + struct dpaa2_fd *fds;
> + int enqueued, i;
> +
> + percpu_stats = this_cpu_ptr(priv->percpu_stats);
> +
> + // enqueue the array of XDP_TX frames
> + enqueued = dpaa2_eth_xdp_flush(priv, fq, &fq->xdp_tx_fds);
> +
> + /* update statistics */
> + percpu_stats->tx_packets += enqueued;
> + fds = fq->xdp_tx_fds.fds;
> + for (i = 0; i < enqueued; i++) {
> + percpu_stats->tx_bytes += dpaa2_fd_get_len(&fds[i]);
> + ch->stats.xdp_tx++;
> + }
> + for (i = enqueued; i < fq->xdp_tx_fds.num; i++) {
> + xdp_release_buf(priv, ch, dpaa2_fd_get_addr(&fds[i]));
> + percpu_stats->tx_errors++;
> + ch->stats.xdp_tx_err++;
> + }
> + fq->xdp_tx_fds.num = 0;
> +}
> +
> +static void xdp_enqueue(struct dpaa2_eth_priv *priv,
> + struct dpaa2_eth_channel *ch,
> + struct dpaa2_fd *fd,
> + void *buf_start, u16 queue_id)
> {
> - struct dpaa2_eth_fq *fq;
> struct dpaa2_faead *faead;
> + struct dpaa2_fd *dest_fd;
> + struct dpaa2_eth_fq *fq;
> u32 ctrl, frc;
> - int i, err;
>
> /* Mark the egress frame hardware annotation area as valid */
> frc = dpaa2_fd_get_frc(fd);
> @@ -296,13 +326,13 @@ static int xdp_enqueue(struct dpaa2_eth_priv *priv,
> struct dpaa2_fd *fd,
> faead->conf_fqid = 0;
>
> fq = &priv->fq[queue_id];
> - for (i = 0; i < DPAA2_ETH_ENQUEUE_RETRIES; i++) {
> - err = priv->enqueue(priv, fq, fd, 0, 1, NULL);
> - if (err != -EBUSY)
> - break;
> - }
> + dest_fd = &fq->xdp_tx_fds.fds[fq->xdp_tx_fds.num++];
> + memcpy(dest_fd, fd, sizeof(*dest_fd));
>
> - return err;
> + if (fq->xdp_tx_fds.num < DEV_MAP_BULK_SIZE)
> + return;
> +
> + xdp_tx_flush(priv, ch, fq);
> }
>
> static u32 run_xdp(struct dpaa2_eth_priv *priv, @@ -311,14 +341,11 @@ static
> u32 run_xdp(struct dpaa2_eth_priv *priv,
> struct dpaa2_fd *fd, void *vaddr)
> {
> dma_addr_t addr = dpaa2_fd_get_addr(fd);
> - struct rtnl_link_stats64 *percpu_stats;
> struct bpf_prog *xdp_prog;
> struct xdp_buff xdp;
> u32 xdp_act = XDP_PASS;
> int err;
>
> - percpu_stats = this_cpu_ptr(priv->percpu_stats);
> -
> rcu_read_lock();
>
> xdp_prog = READ_ONCE(ch->xdp.prog);
> @@ -341,16 +368,7 @@ static u32 run_xdp(struct dpaa2_eth_priv *priv,
> case XDP_PASS:
> break;
> case XDP_TX:
> - err = xdp_enqueue(priv, fd, vaddr, rx_fq->flowid);
> - if (err) {
> - xdp_release_buf(priv, ch, addr);
> - percpu_stats->tx_errors++;
> - ch->stats.xdp_tx_err++;
> - } else {
> - percpu_stats->tx_packets++;
> - percpu_stats->tx_bytes += dpaa2_fd_get_len(fd);
> - ch->stats.xdp_tx++;
> - }
> + xdp_enqueue(priv, ch, fd, vaddr, rx_fq->flowid);
> break;
> default:
> bpf_warn_invalid_xdp_action(xdp_act);
> @@ -1168,6 +1186,7 @@ static int dpaa2_eth_poll(struct napi_struct *napi, int
> budget)
> int store_cleaned, work_done;
> struct list_head rx_list;
> int retries = 0;
> + u16 flowid;
> int err;
>
> ch = container_of(napi, struct dpaa2_eth_channel, napi); @@ -1190,6
> +1209,7 @@ static int dpaa2_eth_poll(struct napi_struct *napi, int budget)
> break;
> if (fq->type == DPAA2_RX_FQ) {
> rx_cleaned += store_cleaned;
> + flowid = fq->flowid;
> } else {
> txconf_cleaned += store_cleaned;
> /* We have a single Tx conf FQ on this channel */ @@ -
> 1232,6 +1252,8 @@ static int dpaa2_eth_poll(struct napi_struct *napi, int
> budget)
>
> if (ch->xdp.res & XDP_REDIRECT)
> xdp_do_flush_map();
> + else if (rx_cleaned && ch->xdp.res & XDP_TX)
> + xdp_tx_flush(priv, ch, &priv->fq[flowid]);
>
> return work_done;
> }
> diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
> b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
> index b5f7dbbc2a02..9c37b6946cec 100644
> --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
> +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
> @@ -334,6 +334,7 @@ struct dpaa2_eth_fq {
> struct dpaa2_eth_fq_stats stats;
>
> struct dpaa2_eth_xdp_fds xdp_redirect_fds;
> + struct dpaa2_eth_xdp_fds xdp_tx_fds;
> };
>
> struct dpaa2_eth_ch_xdp {
> --
> 2.17.1
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