Commit 9570df35 authored by Song Yoong Siang's avatar Song Yoong Siang Committed by Jakub Kicinski
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net: stmmac: add Rx HWTS metadata to XDP ZC receive pkt 



Add receive hardware timestamp metadata support via kfunc to XDP Zero Copy
receive packets.

Signed-off-by: default avatarSong Yoong Siang <yoong.siang.song@intel.com>
Acked-by: default avatarJesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent e3f9c3e3

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

+22 −0
Original line number Diff line number Diff line
@@ -1614,6 +1614,12 @@ static int stmmac_alloc_rx_buffers_zc(struct stmmac_priv *priv, 
	struct stmmac_rx_queue *rx_q = &dma_conf->rx_queue[queue];

	int i;



	/* struct stmmac_xdp_buff is using cb field (maximum size of 24 bytes)

	 * in struct xdp_buff_xsk to stash driver specific information. Thus,

	 * use this macro to make sure no size violations.

	 */

	XSK_CHECK_PRIV_TYPE(struct stmmac_xdp_buff);



	for (i = 0; i < dma_conf->dma_rx_size; i++) {

		struct stmmac_rx_buffer *buf;

		dma_addr_t dma_addr;
@@ -4998,6 +5004,16 @@ static bool stmmac_rx_refill_zc(struct stmmac_priv *priv, u32 queue, u32 budget) 
	return ret;

}



static struct stmmac_xdp_buff *xsk_buff_to_stmmac_ctx(struct xdp_buff *xdp)

{

	/* In XDP zero copy data path, xdp field in struct xdp_buff_xsk is used

	 * to represent incoming packet, whereas cb field in the same structure

	 * is used to store driver specific info. Thus, struct stmmac_xdp_buff

	 * is laid on top of xdp and cb fields of struct xdp_buff_xsk.

	 */

	return (struct stmmac_xdp_buff *)xdp;

}



static int stmmac_rx_zc(struct stmmac_priv *priv, int limit, u32 queue)

{

	struct stmmac_rx_queue *rx_q = &priv->dma_conf.rx_queue[queue];
@@ -5027,6 +5043,7 @@ static int stmmac_rx_zc(struct stmmac_priv *priv, int limit, u32 queue) 
	}

	while (count < limit) {

		struct stmmac_rx_buffer *buf;

		struct stmmac_xdp_buff *ctx;

		unsigned int buf1_len = 0;

		struct dma_desc *np, *p;

		int entry;
@@ -5112,6 +5129,11 @@ static int stmmac_rx_zc(struct stmmac_priv *priv, int limit, u32 queue) 
			goto read_again;

		}



		ctx = xsk_buff_to_stmmac_ctx(buf->xdp);

		ctx->priv = priv;

		ctx->desc = p;

		ctx->ndesc = np;



		/* XDP ZC Frame only support primary buffers for now */

		buf1_len = stmmac_rx_buf1_len(priv, p, status, len);

		len += buf1_len;