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Message-ID: <167950089257.2796265.6749372926848361311.stgit@firesoul>
Date: Wed, 22 Mar 2023 17:01:32 +0100
From: Jesper Dangaard Brouer <brouer@...hat.com>
To: bpf@...r.kernel.org
Cc: Jesper Dangaard Brouer <brouer@...hat.com>, netdev@...r.kernel.org,
Stanislav Fomichev <sdf@...gle.com>, martin.lau@...nel.org,
ast@...nel.org, daniel@...earbox.net, alexandr.lobakin@...el.com,
larysa.zaremba@...el.com, xdp-hints@...-project.net,
anthony.l.nguyen@...el.com, yoong.siang.song@...el.com,
boon.leong.ong@...el.com, intel-wired-lan@...ts.osuosl.org,
pabeni@...hat.com, jesse.brandeburg@...el.com, kuba@...nel.org,
edumazet@...gle.com, john.fastabend@...il.com, hawk@...nel.org,
davem@...emloft.net
Subject: [PATCH bpf-next V3 4/6] igc: add igc_xdp_buff wrapper for xdp_buff in
driver
Driver specific metadata data for XDP-hints kfuncs are propagated via tail
extending the struct xdp_buff with a locally scoped driver struct.
Zero-Copy AF_XDP/XSK does similar tricks via struct xdp_buff_xsk. This
xdp_buff_xsk struct contains a CB area (24 bytes) that can be used for
extending the locally scoped driver into. The XSK_CHECK_PRIV_TYPE define
catch size violations build time.
Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
---
drivers/net/ethernet/intel/igc/igc.h | 6 ++++++
drivers/net/ethernet/intel/igc/igc_main.c | 30 ++++++++++++++++++++++-------
2 files changed, 29 insertions(+), 7 deletions(-)
diff --git a/drivers/net/ethernet/intel/igc/igc.h b/drivers/net/ethernet/intel/igc/igc.h
index f83cbc4a1afa..bc67a52e47e8 100644
--- a/drivers/net/ethernet/intel/igc/igc.h
+++ b/drivers/net/ethernet/intel/igc/igc.h
@@ -499,6 +499,12 @@ struct igc_rx_buffer {
};
};
+/* context wrapper around xdp_buff to provide access to descriptor metadata */
+struct igc_xdp_buff {
+ struct xdp_buff xdp;
+ union igc_adv_rx_desc *rx_desc;
+};
+
struct igc_q_vector {
struct igc_adapter *adapter; /* backlink */
void __iomem *itr_register;
diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index f6a54feec011..a78d7e6bcfd6 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -2223,6 +2223,8 @@ static bool igc_alloc_rx_buffers_zc(struct igc_ring *ring, u16 count)
if (!count)
return ok;
+ XSK_CHECK_PRIV_TYPE(struct igc_xdp_buff);
+
desc = IGC_RX_DESC(ring, i);
bi = &ring->rx_buffer_info[i];
i -= ring->count;
@@ -2507,8 +2509,8 @@ static int igc_clean_rx_irq(struct igc_q_vector *q_vector, const int budget)
union igc_adv_rx_desc *rx_desc;
struct igc_rx_buffer *rx_buffer;
unsigned int size, truesize;
+ struct igc_xdp_buff ctx;
ktime_t timestamp = 0;
- struct xdp_buff xdp;
int pkt_offset = 0;
void *pktbuf;
@@ -2542,13 +2544,14 @@ static int igc_clean_rx_irq(struct igc_q_vector *q_vector, const int budget)
}
if (!skb) {
- xdp_init_buff(&xdp, truesize, &rx_ring->xdp_rxq);
- xdp_prepare_buff(&xdp, pktbuf - igc_rx_offset(rx_ring),
+ xdp_init_buff(&ctx.xdp, truesize, &rx_ring->xdp_rxq);
+ xdp_prepare_buff(&ctx.xdp, pktbuf - igc_rx_offset(rx_ring),
igc_rx_offset(rx_ring) + pkt_offset,
size, true);
- xdp_buff_clear_frags_flag(&xdp);
+ xdp_buff_clear_frags_flag(&ctx.xdp);
+ ctx.rx_desc = rx_desc;
- skb = igc_xdp_run_prog(adapter, &xdp);
+ skb = igc_xdp_run_prog(adapter, &ctx.xdp);
}
if (IS_ERR(skb)) {
@@ -2570,9 +2573,9 @@ static int igc_clean_rx_irq(struct igc_q_vector *q_vector, const int budget)
} else if (skb)
igc_add_rx_frag(rx_ring, rx_buffer, skb, size);
else if (ring_uses_build_skb(rx_ring))
- skb = igc_build_skb(rx_ring, rx_buffer, &xdp);
+ skb = igc_build_skb(rx_ring, rx_buffer, &ctx.xdp);
else
- skb = igc_construct_skb(rx_ring, rx_buffer, &xdp,
+ skb = igc_construct_skb(rx_ring, rx_buffer, &ctx.xdp,
timestamp);
/* exit if we failed to retrieve a buffer */
@@ -2673,6 +2676,15 @@ static void igc_dispatch_skb_zc(struct igc_q_vector *q_vector,
napi_gro_receive(&q_vector->napi, skb);
}
+static struct igc_xdp_buff *xsk_buff_to_igc_ctx(struct xdp_buff *xdp)
+{
+ /* xdp_buff pointer used by ZC code path is alloc as xdp_buff_xsk. The
+ * igc_xdp_buff shares its layout with xdp_buff_xsk and private
+ * igc_xdp_buff fields fall into xdp_buff_xsk->cb
+ */
+ return (struct igc_xdp_buff *)xdp;
+}
+
static int igc_clean_rx_irq_zc(struct igc_q_vector *q_vector, const int budget)
{
struct igc_adapter *adapter = q_vector->adapter;
@@ -2691,6 +2703,7 @@ static int igc_clean_rx_irq_zc(struct igc_q_vector *q_vector, const int budget)
while (likely(total_packets < budget)) {
union igc_adv_rx_desc *desc;
struct igc_rx_buffer *bi;
+ struct igc_xdp_buff *ctx;
ktime_t timestamp = 0;
unsigned int size;
int res;
@@ -2708,6 +2721,9 @@ static int igc_clean_rx_irq_zc(struct igc_q_vector *q_vector, const int budget)
bi = &ring->rx_buffer_info[ntc];
+ ctx = xsk_buff_to_igc_ctx(bi->xdp);
+ ctx->rx_desc = desc;
+
if (igc_test_staterr(desc, IGC_RXDADV_STAT_TSIP)) {
timestamp = igc_ptp_rx_pktstamp(q_vector->adapter,
bi->xdp->data);
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