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Message-ID: <20231223025554.2316836-19-aleksander.lobakin@intel.com>
Date: Sat, 23 Dec 2023 03:55:38 +0100
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: Alexander Lobakin <aleksander.lobakin@...el.com>,
Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
Michal Kubiak <michal.kubiak@...el.com>,
Larysa Zaremba <larysa.zaremba@...el.com>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Willem de Bruijn <willemdebruijn.kernel@...il.com>,
intel-wired-lan@...ts.osuosl.org,
netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH RFC net-next 18/34] libie: add a couple of XDP helpers
"Couple" is a bit humbly... Add the following functionality to libie:
* XDP shared queues managing
* XDP_TX bulk sending infra
* .ndo_xdp_xmit() infra
* adding buffers to &xdp_buff
* running XDP prog and managing its verdict
* completing XDP Tx buffers
* ^ repeat everything for XSk
Signed-off-by: Alexander Lobakin <aleksander.lobakin@...el.com>
---
drivers/net/ethernet/intel/libie/Makefile | 3 +
drivers/net/ethernet/intel/libie/tx.c | 16 +
drivers/net/ethernet/intel/libie/xdp.c | 50 ++
drivers/net/ethernet/intel/libie/xsk.c | 49 ++
include/linux/net/intel/libie/tx.h | 6 +
include/linux/net/intel/libie/xdp.h | 586 ++++++++++++++++++++++
include/linux/net/intel/libie/xsk.h | 172 +++++++
7 files changed, 882 insertions(+)
create mode 100644 drivers/net/ethernet/intel/libie/tx.c
create mode 100644 drivers/net/ethernet/intel/libie/xdp.c
create mode 100644 drivers/net/ethernet/intel/libie/xsk.c
create mode 100644 include/linux/net/intel/libie/xdp.h
create mode 100644 include/linux/net/intel/libie/xsk.h
diff --git a/drivers/net/ethernet/intel/libie/Makefile b/drivers/net/ethernet/intel/libie/Makefile
index 76f32253481b..7ca353e4ecdf 100644
--- a/drivers/net/ethernet/intel/libie/Makefile
+++ b/drivers/net/ethernet/intel/libie/Makefile
@@ -5,3 +5,6 @@ obj-$(CONFIG_LIBIE) += libie.o
libie-objs += rx.o
libie-objs += stats.o
+libie-objs += tx.o
+libie-objs += xdp.o
+libie-objs += xsk.o
diff --git a/drivers/net/ethernet/intel/libie/tx.c b/drivers/net/ethernet/intel/libie/tx.c
new file mode 100644
index 000000000000..9e3b6e3c3c25
--- /dev/null
+++ b/drivers/net/ethernet/intel/libie/tx.c
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright(c) 2023 Intel Corporation. */
+
+#include <linux/net/intel/libie/xdp.h>
+
+void libie_tx_complete_any(struct libie_tx_buffer *buf, struct device *dev,
+ struct xdp_frame_bulk *bq, u32 *xdp_tx_active,
+ struct libie_sq_onstack_stats *ss)
+{
+ if (buf->type > LIBIE_TX_BUF_SKB)
+ libie_xdp_complete_tx_buf(buf, dev, false, bq, xdp_tx_active,
+ ss);
+ else
+ libie_tx_complete_buf(buf, dev, false, ss);
+}
+EXPORT_SYMBOL_NS_GPL(libie_tx_complete_any, LIBIE);
diff --git a/drivers/net/ethernet/intel/libie/xdp.c b/drivers/net/ethernet/intel/libie/xdp.c
new file mode 100644
index 000000000000..f47a17ca6e66
--- /dev/null
+++ b/drivers/net/ethernet/intel/libie/xdp.c
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright(c) 2023 Intel Corporation. */
+
+#include <linux/net/intel/libie/xdp.h>
+
+/* XDP SQ sharing */
+
+DEFINE_STATIC_KEY_FALSE(libie_xdp_sq_share);
+EXPORT_SYMBOL_NS_GPL(libie_xdp_sq_share, LIBIE);
+
+void __libie_xdp_sq_get(struct libie_xdp_sq_lock *lock,
+ const struct net_device *dev)
+{
+ bool warn;
+
+ spin_lock_init(&lock->lock);
+ lock->share = true;
+
+ warn = !static_key_enabled(&libie_xdp_sq_share);
+ static_branch_inc_cpuslocked(&libie_xdp_sq_share);
+
+ if (warn)
+ netdev_warn(dev, "XDP SQ sharing enabled, possible XDP_TX/XDP_REDIRECT slowdown\n");
+
+}
+EXPORT_SYMBOL_NS_GPL(__libie_xdp_sq_get, LIBIE);
+
+void __libie_xdp_sq_put(struct libie_xdp_sq_lock *lock,
+ const struct net_device *dev)
+{
+ static_branch_dec_cpuslocked(&libie_xdp_sq_share);
+
+ if (!static_key_enabled(&libie_xdp_sq_share))
+ netdev_notice(dev, "XDP SQ sharing disabled\n");
+
+ lock->share = false;
+}
+EXPORT_SYMBOL_NS_GPL(__libie_xdp_sq_put, LIBIE);
+
+/* ``XDP_TX`` bulking */
+
+void libie_xdp_tx_return_bulk(const struct libie_xdp_tx_frame *bq, u32 count)
+{
+ for (u32 i = 0; i < count; i++) {
+ struct page *page = virt_to_page(bq[i].data);
+
+ page_pool_recycle_direct(page->pp, page);
+ }
+}
+EXPORT_SYMBOL_NS_GPL(libie_xdp_tx_return_bulk, LIBIE);
diff --git a/drivers/net/ethernet/intel/libie/xsk.c b/drivers/net/ethernet/intel/libie/xsk.c
new file mode 100644
index 000000000000..ffbdb85586f1
--- /dev/null
+++ b/drivers/net/ethernet/intel/libie/xsk.c
@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright(c) 2023 Intel Corporation. */
+
+#include <linux/net/intel/libie/xsk.h>
+
+#define LIBIE_XSK_DMA_ATTR (DMA_ATTR_WEAK_ORDERING | \
+ DMA_ATTR_SKIP_CPU_SYNC)
+
+int libie_xsk_enable_pool(struct net_device *dev, u32 qid, unsigned long *map)
+{
+ struct xsk_buff_pool *pool;
+ int ret;
+
+ if (qid >= min(dev->real_num_rx_queues, dev->real_num_tx_queues))
+ return -EINVAL;
+
+ pool = xsk_get_pool_from_qid(dev, qid);
+ if (!pool)
+ return -EINVAL;
+
+ ret = xsk_pool_dma_map(pool, dev->dev.parent, LIBIE_XSK_DMA_ATTR);
+ if (ret)
+ return ret;
+
+ set_bit(qid, map);
+
+ return 0;
+}
+EXPORT_SYMBOL_NS_GPL(libie_xsk_enable_pool, LIBIE);
+
+int libie_xsk_disable_pool(struct net_device *dev, u32 qid,
+ unsigned long *map)
+{
+ struct xsk_buff_pool *pool;
+
+ if (qid >= min(dev->real_num_rx_queues, dev->real_num_tx_queues))
+ return -EINVAL;
+
+ pool = xsk_get_pool_from_qid(dev, qid);
+ if (!pool)
+ return -EINVAL;
+
+ xsk_pool_dma_unmap(pool, LIBIE_XSK_DMA_ATTR);
+
+ clear_bit(qid, map);
+
+ return 0;
+}
+EXPORT_SYMBOL_NS_GPL(libie_xsk_disable_pool, LIBIE);
diff --git a/include/linux/net/intel/libie/tx.h b/include/linux/net/intel/libie/tx.h
index 07a19abb72fd..4d4d85af6f7e 100644
--- a/include/linux/net/intel/libie/tx.h
+++ b/include/linux/net/intel/libie/tx.h
@@ -85,4 +85,10 @@ static inline void libie_tx_complete_buf(struct libie_tx_buffer *buf,
buf->type = LIBIE_TX_BUF_EMPTY;
}
+struct xdp_frame_bulk;
+
+void libie_tx_complete_any(struct libie_tx_buffer *buf, struct device *dev,
+ struct xdp_frame_bulk *bq, u32 *xdp_tx_active,
+ struct libie_sq_onstack_stats *ss);
+
#endif /* __LIBIE_TX_H */
diff --git a/include/linux/net/intel/libie/xdp.h b/include/linux/net/intel/libie/xdp.h
new file mode 100644
index 000000000000..087fc075078f
--- /dev/null
+++ b/include/linux/net/intel/libie/xdp.h
@@ -0,0 +1,586 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* Copyright(c) 2023 Intel Corporation. */
+
+#ifndef __LIBIE_XDP_H
+#define __LIBIE_XDP_H
+
+#include <linux/bpf_trace.h>
+#include <linux/net/intel/libie/rx.h>
+#include <linux/net/intel/libie/tx.h>
+
+#include <net/xdp_sock_drv.h>
+
+/* Defined as bits to be able to use them as a mask */
+enum {
+ LIBIE_XDP_PASS = 0U,
+ LIBIE_XDP_DROP = BIT(0),
+ LIBIE_XDP_ABORTED = BIT(1),
+ LIBIE_XDP_TX = BIT(2),
+ LIBIE_XDP_REDIRECT = BIT(3),
+};
+
+/* XDP SQ sharing */
+
+struct libie_xdp_sq_lock {
+ spinlock_t lock;
+ bool share;
+};
+
+DECLARE_STATIC_KEY_FALSE(libie_xdp_sq_share);
+
+static inline u32 libie_xdp_get_sq_num(u32 rxq, u32 txq, u32 max)
+{
+ return min(max(nr_cpu_ids, rxq), max - txq);
+}
+
+static inline bool libie_xdp_sq_shared(u32 qid)
+{
+ return qid < nr_cpu_ids;
+}
+
+static inline u32 libie_xdp_sq_id(u32 num)
+{
+ u32 ret = smp_processor_id();
+
+ if (static_branch_unlikely(&libie_xdp_sq_share) &&
+ libie_xdp_sq_shared(num))
+ ret %= num;
+
+ return ret;
+}
+
+void __libie_xdp_sq_get(struct libie_xdp_sq_lock *lock,
+ const struct net_device *dev);
+void __libie_xdp_sq_put(struct libie_xdp_sq_lock *lock,
+ const struct net_device *dev);
+
+static inline void libie_xdp_sq_get(struct libie_xdp_sq_lock *lock,
+ const struct net_device *dev,
+ bool share)
+{
+ if (unlikely(share))
+ __libie_xdp_sq_get(lock, dev);
+}
+
+static inline void libie_xdp_sq_put(struct libie_xdp_sq_lock *lock,
+ const struct net_device *dev)
+{
+ if (static_branch_unlikely(&libie_xdp_sq_share) && lock->share)
+ __libie_xdp_sq_put(lock, dev);
+}
+
+static inline void __acquires(&lock->lock)
+libie_xdp_sq_lock(struct libie_xdp_sq_lock *lock)
+{
+ if (static_branch_unlikely(&libie_xdp_sq_share) && lock->share)
+ spin_lock(&lock->lock);
+}
+
+static inline void __releases(&lock->lock)
+libie_xdp_sq_unlock(struct libie_xdp_sq_lock *lock)
+{
+ if (static_branch_unlikely(&libie_xdp_sq_share) && lock->share)
+ spin_unlock(&lock->lock);
+}
+
+/* ``XDP_TX`` bulking */
+
+#define LIBIE_XDP_TX_BULK XDP_BULK_QUEUE_SIZE
+#define LIBIE_XDP_TX_BATCH 8
+
+#ifdef __clang__
+#define libie_xdp_tx_for _Pragma("clang loop unroll_count(8)") for
+#elif __GNUC__ >= 8
+#define libie_xdp_tx_for _Pragma("GCC unroll (8)") for
+#else
+#define libie_xdp_tx_for for
+#endif
+
+struct libie_xdp_tx_frame {
+ union {
+ struct {
+ void *data;
+ u16 len;
+
+ enum xdp_buff_flags flags:16;
+ u32 soff;
+ };
+ struct {
+ struct xdp_frame *xdpf;
+ dma_addr_t dma;
+ };
+
+ struct {
+ struct xdp_buff *xsk;
+ /* u32 len */
+ };
+ struct xdp_desc desc;
+ };
+};
+static_assert(sizeof(struct libie_xdp_tx_frame) == sizeof(struct xdp_desc));
+
+struct libie_xdp_tx_bulk {
+ const struct bpf_prog *prog;
+ struct net_device *dev;
+ void *xdpq;
+
+ u32 act_mask;
+ u32 count;
+ struct libie_xdp_tx_frame bulk[LIBIE_XDP_TX_BULK];
+};
+
+
+struct libie_xdp_tx_queue {
+ union {
+ struct device *dev;
+ struct xsk_buff_pool *pool;
+ };
+ struct libie_tx_buffer *tx_buf;
+ void *desc_ring;
+
+ struct libie_xdp_sq_lock *xdp_lock;
+ u16 *next_to_use;
+ u32 desc_count;
+
+ u32 *xdp_tx_active;
+};
+
+struct libie_xdp_tx_desc {
+ dma_addr_t addr;
+ u32 len;
+};
+
+static inline void __libie_xdp_tx_init_bulk(struct libie_xdp_tx_bulk *bq,
+ const struct bpf_prog *prog,
+ struct net_device *dev, void *xdpq)
+{
+ bq->prog = prog;
+ bq->dev = dev;
+ bq->xdpq = xdpq;
+
+ bq->act_mask = 0;
+ bq->count = 0;
+}
+
+#define _libie_xdp_tx_init_bulk(bq, prog, dev, xdpqs, num, uniq) ({ \
+ const struct bpf_prog *uniq = rcu_dereference(prog); \
+ \
+ if (uniq) \
+ __libie_xdp_tx_init_bulk(bq, uniq, dev, \
+ (xdpqs)[libie_xdp_sq_id(num)]); \
+})
+
+#define libie_xdp_tx_init_bulk(bq, prog, dev, xdpqs, num) \
+ _libie_xdp_tx_init_bulk(bq, prog, dev, xdpqs, num, \
+ __UNIQUE_ID(prog_))
+
+static inline void libie_xdp_tx_queue_bulk(struct libie_xdp_tx_bulk *bq,
+ const struct xdp_buff *xdp)
+{
+ bq->bulk[bq->count++] = (typeof(*bq->bulk)){
+ .data = xdp->data,
+ .len = xdp->data_end - xdp->data,
+ .soff = xdp_data_hard_end(xdp) - xdp->data,
+ .flags = xdp->flags,
+ };
+}
+
+static inline struct libie_xdp_tx_desc
+libie_xdp_tx_fill_buf(const struct libie_xdp_tx_frame *frm,
+ const struct libie_xdp_tx_queue *sq)
+{
+ struct libie_xdp_tx_desc desc = {
+ .len = frm->len,
+ };
+ struct libie_tx_buffer *tx_buf;
+
+ desc.addr = page_pool_dma_sync_va_for_device(frm->data, desc.len);
+
+ tx_buf = &sq->tx_buf[*sq->next_to_use];
+ tx_buf->type = LIBIE_TX_BUF_XDP_TX;
+ tx_buf->gso_segs = 1;
+ tx_buf->bytecount = desc.len;
+ tx_buf->sinfo = frm->data + frm->soff;
+
+ return desc;
+}
+
+static __always_inline u32
+libie_xdp_tx_xmit_bulk(const struct libie_xdp_tx_bulk *bq,
+ u32 (*prep)(void *xdpq, struct libie_xdp_tx_queue *sq),
+ struct libie_xdp_tx_desc
+ (*fill)(const struct libie_xdp_tx_frame *frm,
+ const struct libie_xdp_tx_queue *sq),
+ void (*xmit)(struct libie_xdp_tx_desc desc,
+ const struct libie_xdp_tx_queue *sq))
+{
+ u32 this, batched, leftover, off = 0;
+ struct libie_xdp_tx_queue sq;
+ u32 free, count, ntu, i = 0;
+
+ free = prep(bq->xdpq, &sq);
+ count = min3(bq->count, free, LIBIE_XDP_TX_BULK);
+ ntu = *sq.next_to_use;
+
+again:
+ this = sq.desc_count - ntu;
+ if (likely(this > count))
+ this = count;
+
+ batched = ALIGN_DOWN(this, LIBIE_XDP_TX_BATCH);
+ leftover = this - batched;
+
+ for ( ; i < off + batched; i += LIBIE_XDP_TX_BATCH) {
+ libie_xdp_tx_for (u32 j = 0; j < LIBIE_XDP_TX_BATCH; j++) {
+ struct libie_xdp_tx_desc desc;
+
+ desc = fill(&bq->bulk[i + j], &sq);
+ xmit(desc, &sq);
+
+ ntu++;
+ }
+ }
+
+ for ( ; i < off + batched + leftover; i++) {
+ struct libie_xdp_tx_desc desc;
+
+ desc = fill(&bq->bulk[i], &sq);
+ xmit(desc, &sq);
+
+ ntu++;
+ }
+
+ if (likely(ntu < sq.desc_count))
+ goto out;
+
+ ntu = 0;
+
+ count -= this;
+ if (count) {
+ off = i;
+ goto again;
+ }
+
+out:
+ *sq.next_to_use = ntu;
+ if (sq.xdp_tx_active)
+ *sq.xdp_tx_active += i;
+
+ libie_xdp_sq_unlock(sq.xdp_lock);
+
+ return i;
+}
+
+void libie_xdp_tx_return_bulk(const struct libie_xdp_tx_frame *bq, u32 count);
+
+static __always_inline bool
+__libie_xdp_tx_flush_bulk(struct libie_xdp_tx_bulk *bq,
+ u32 (*prep)(void *xdpq,
+ struct libie_xdp_tx_queue *sq),
+ struct libie_xdp_tx_desc
+ (*fill)(const struct libie_xdp_tx_frame *frm,
+ const struct libie_xdp_tx_queue *sq),
+ void (*xmit)(struct libie_xdp_tx_desc desc,
+ const struct libie_xdp_tx_queue *sq))
+{
+ u32 sent, drops;
+ int err = 0;
+
+ sent = libie_xdp_tx_xmit_bulk(bq, prep, fill, xmit);
+ drops = bq->count - sent;
+ bq->count = 0;
+
+ if (unlikely(drops)) {
+ trace_xdp_exception(bq->dev, bq->prog, XDP_TX);
+ err = -ENXIO;
+
+ libie_xdp_tx_return_bulk(&bq->bulk[sent], drops);
+ }
+
+ trace_xdp_bulk_tx(bq->dev, sent, drops, err);
+
+ return likely(sent);
+}
+
+#define libie_xdp_tx_flush_bulk(bq, prep, xmit) \
+ __libie_xdp_tx_flush_bulk(bq, prep, libie_xdp_tx_fill_buf, xmit)
+
+/* .ndo_xdp_xmit() implementation */
+
+static inline bool libie_xdp_xmit_queue_bulk(struct libie_xdp_tx_bulk *bq,
+ struct xdp_frame *xdpf)
+{
+ struct device *dev = bq->dev->dev.parent;
+ dma_addr_t dma;
+
+ dma = dma_map_single(dev, xdpf->data, xdpf->len, DMA_TO_DEVICE);
+ if (dma_mapping_error(dev, dma))
+ return false;
+
+ bq->bulk[bq->count++] = (typeof(*bq->bulk)){
+ .xdpf = xdpf,
+ .dma = dma,
+ };
+
+ return true;
+}
+
+static inline struct libie_xdp_tx_desc
+libie_xdp_xmit_fill_buf(const struct libie_xdp_tx_frame *frm,
+ const struct libie_xdp_tx_queue *sq)
+{
+ struct xdp_frame *xdpf = frm->xdpf;
+ struct libie_xdp_tx_desc desc = {
+ .addr = frm->dma,
+ .len = xdpf->len,
+ };
+ struct libie_tx_buffer *tx_buf;
+
+ tx_buf = &sq->tx_buf[*sq->next_to_use];
+ tx_buf->type = LIBIE_TX_BUF_XDP_XMIT;
+ tx_buf->gso_segs = 1;
+ tx_buf->bytecount = desc.len;
+ tx_buf->xdpf = xdpf;
+
+ dma_unmap_addr_set(tx_buf, dma, frm->dma);
+ dma_unmap_len_set(tx_buf, len, desc.len);
+
+ return desc;
+}
+
+static __always_inline int
+__libie_xdp_xmit_do_bulk(struct libie_xdp_tx_bulk *bq,
+ struct xdp_frame **frames, u32 n, u32 flags,
+ u32 (*prep)(void *xdpq,
+ struct libie_xdp_tx_queue *sq),
+ void (*xmit)(struct libie_xdp_tx_desc desc,
+ const struct libie_xdp_tx_queue *sq),
+ void (*finalize)(void *xdpq, bool tail))
+{
+ int err = -ENXIO;
+ u32 nxmit = 0;
+
+ if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
+ return -EINVAL;
+
+ for (u32 i = 0; i < n; i++) {
+ if (!libie_xdp_xmit_queue_bulk(bq, frames[i]))
+ break;
+ }
+
+ if (unlikely(!bq->count))
+ goto out;
+
+ nxmit = libie_xdp_tx_xmit_bulk(bq, prep, libie_xdp_xmit_fill_buf,
+ xmit);
+ if (unlikely(!nxmit))
+ goto out;
+
+ finalize(bq->xdpq, flags & XDP_XMIT_FLUSH);
+
+ if (likely(nxmit == n))
+ err = 0;
+
+out:
+ trace_xdp_bulk_tx(bq->dev, nxmit, n - nxmit, err);
+
+ return nxmit;
+}
+
+#define libie_xdp_xmit_init_bulk(bq, dev, xdpqs, num) \
+ __libie_xdp_tx_init_bulk(bq, NULL, dev, \
+ (xdpqs)[libie_xdp_sq_id(num)])
+
+#define _libie_xdp_xmit_do_bulk(dev, n, fr, fl, xqs, nqs, pr, xm, fin, un) ({ \
+ struct libie_xdp_tx_bulk un; \
+ \
+ libie_xdp_xmit_init_bulk(&un, dev, xqs, nqs); \
+ __libie_xdp_xmit_do_bulk(&un, fr, n, fl, pr, xm, fin); \
+})
+#define libie_xdp_xmit_do_bulk(dev, n, fr, fl, xqs, nqs, pr, xm, fin) \
+ _libie_xdp_xmit_do_bulk(dev, n, fr, fl, xqs, nqs, pr, xm, fin, \
+ __UNIQUE_ID(bq_))
+
+/* Rx polling path */
+
+static inline void libie_xdp_init_buff(struct xdp_buff *dst,
+ const struct xdp_buff *src,
+ struct xdp_rxq_info *rxq)
+{
+ if (!src->data) {
+ dst->data = NULL;
+ dst->rxq = rxq;
+ } else {
+ *dst = *src;
+ }
+}
+
+#define libie_xdp_save_buff(dst, src) libie_xdp_init_buff(dst, src, NULL)
+
+/**
+ * libie_xdp_process_buff - process an Rx buffer
+ * @xdp: XDP buffer to attach the buffer to
+ * @buf: Rx buffer to process
+ * @len: received data length from the descriptor
+ *
+ * Return: false if the descriptor must be skipped, true otherwise.
+ */
+static inline bool libie_xdp_process_buff(struct xdp_buff *xdp,
+ const struct libie_rx_buffer *buf,
+ u32 len)
+{
+ if (!libie_rx_sync_for_cpu(buf, len))
+ return false;
+
+ if (!xdp->data) {
+ xdp->flags = 0;
+ xdp->frame_sz = buf->truesize;
+
+ xdp_prepare_buff(xdp, page_address(buf->page) + buf->offset,
+ buf->page->pp->p.offset, len, true);
+ } else if (!xdp_buff_add_frag(xdp, buf->page,
+ buf->offset + buf->page->pp->p.offset,
+ len, buf->truesize)) {
+ xdp_return_buff(xdp);
+ xdp->data = NULL;
+
+ return false;
+ }
+
+ return true;
+}
+
+/**
+ * __libie_xdp_run_prog - run XDP program on an XDP buffer
+ * @xdp: XDP buffer to run the prog on
+ * @bq: buffer bulk for ``XDP_TX`` queueing
+ *
+ * Return: LIBIE_XDP_{PASS,DROP,TX,REDIRECT} depending on the prog's verdict.
+ */
+static inline u32 __libie_xdp_run_prog(struct xdp_buff *xdp,
+ struct libie_xdp_tx_bulk *bq)
+{
+ const struct bpf_prog *prog = bq->prog;
+ u32 act;
+
+ act = bpf_prog_run_xdp(prog, xdp);
+ switch (act) {
+ case XDP_ABORTED:
+err:
+ trace_xdp_exception(bq->dev, prog, act);
+ fallthrough;
+ case XDP_DROP:
+ xdp_return_buff(xdp);
+ xdp->data = NULL;
+
+ return LIBIE_XDP_DROP;
+ case XDP_PASS:
+ return LIBIE_XDP_PASS;
+ case XDP_TX:
+ libie_xdp_tx_queue_bulk(bq, xdp);
+ xdp->data = NULL;
+
+ return LIBIE_XDP_TX;
+ case XDP_REDIRECT:
+ if (unlikely(xdp_do_redirect(bq->dev, xdp, prog)))
+ goto err;
+
+ xdp->data = NULL;
+
+ return LIBIE_XDP_REDIRECT;
+ default:
+ bpf_warn_invalid_xdp_action(bq->dev, prog, act);
+ goto err;
+ }
+}
+
+static __always_inline u32
+__libie_xdp_run_flush(struct xdp_buff *xdp, struct libie_xdp_tx_bulk *bq,
+ u32 (*run)(struct xdp_buff *xdp,
+ struct libie_xdp_tx_bulk *bq),
+ bool (*flush_bulk)(struct libie_xdp_tx_bulk *))
+{
+ u32 act;
+
+ act = run(xdp, bq);
+ if (act == LIBIE_XDP_TX &&
+ unlikely(bq->count == LIBIE_XDP_TX_BULK && !flush_bulk(bq)))
+ act = LIBIE_XDP_DROP;
+
+ bq->act_mask |= act;
+
+ return act;
+}
+
+#define libie_xdp_run_prog(xdp, bq, fl) \
+ (__libie_xdp_run_flush(xdp, bq, __libie_xdp_run_prog, fl) == \
+ XDP_PASS)
+
+static __always_inline void
+libie_xdp_finalize_rx(struct libie_xdp_tx_bulk *bq,
+ bool (*flush_bulk)(struct libie_xdp_tx_bulk *),
+ void (*finalize)(void *xdpq, bool tail))
+{
+ if (bq->act_mask & LIBIE_XDP_TX) {
+ if (bq->count)
+ flush_bulk(bq);
+ finalize(bq->xdpq, true);
+ }
+ if (bq->act_mask & LIBIE_XDP_REDIRECT)
+ xdp_do_flush();
+}
+
+/* Tx buffer completion */
+
+static inline void libie_xdp_return_sinfo(const struct libie_tx_buffer *buf,
+ bool napi)
+{
+ const struct skb_shared_info *sinfo = buf->sinfo;
+ struct page *page;
+
+ if (likely(buf->gso_segs == 1))
+ goto return_head;
+
+ for (u32 i = 0; i < sinfo->nr_frags; i++) {
+ page = skb_frag_page(&sinfo->frags[i]);
+ page_pool_put_full_page(page->pp, page, napi);
+ }
+
+return_head:
+ page = virt_to_page(sinfo);
+ page_pool_put_full_page(page->pp, page, napi);
+}
+
+static inline void libie_xdp_complete_tx_buf(struct libie_tx_buffer *buf,
+ struct device *dev, bool napi,
+ struct xdp_frame_bulk *bq,
+ u32 *xdp_tx_active,
+ struct libie_sq_onstack_stats *ss)
+{
+ switch (buf->type) {
+ case LIBIE_TX_BUF_EMPTY:
+ return;
+ case LIBIE_TX_BUF_XDP_TX:
+ libie_xdp_return_sinfo(buf, napi);
+ break;
+ case LIBIE_TX_BUF_XDP_XMIT:
+ dma_unmap_page(dev, dma_unmap_addr(buf, dma),
+ dma_unmap_len(buf, len), DMA_TO_DEVICE);
+ xdp_return_frame_bulk(buf->xdpf, bq);
+ break;
+ case LIBIE_TX_BUF_XSK_TX:
+ xsk_buff_free(buf->xdp);
+ break;
+ default:
+ break;
+ }
+
+ (*xdp_tx_active)--;
+
+ ss->packets += buf->gso_segs;
+ ss->bytes += buf->bytecount;
+
+ buf->type = LIBIE_TX_BUF_EMPTY;
+}
+
+#endif /* __LIBIE_XDP_H */
diff --git a/include/linux/net/intel/libie/xsk.h b/include/linux/net/intel/libie/xsk.h
new file mode 100644
index 000000000000..d21fdb69a5e0
--- /dev/null
+++ b/include/linux/net/intel/libie/xsk.h
@@ -0,0 +1,172 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* Copyright(c) 2023 Intel Corporation. */
+
+#ifndef __LIBIE_XSK_H
+#define __LIBIE_XSK_H
+
+#include <linux/net/intel/libie/xdp.h>
+
+/* ``XDP_TX`` bulking */
+
+#define libie_xsk_tx_init_bulk(bq, prog, dev, xdpqs, num) \
+ __libie_xdp_tx_init_bulk(bq, rcu_dereference(prog), dev, \
+ (xdpqs)[libie_xdp_sq_id(num)])
+
+static inline void libie_xsk_tx_queue_bulk(struct libie_xdp_tx_bulk *bq,
+ struct xdp_buff *xdp)
+{
+ bq->bulk[bq->count++] = (typeof(*bq->bulk)){
+ .xsk = xdp,
+ .len = xdp->data_end - xdp->data,
+ };
+}
+
+static inline struct libie_xdp_tx_desc
+libie_xsk_tx_fill_buf(const struct libie_xdp_tx_frame *frm,
+ const struct libie_xdp_tx_queue *sq)
+{
+ struct libie_xdp_tx_desc desc = {
+ .len = frm->len,
+ };
+ struct xdp_buff *xdp = frm->xsk;
+ struct libie_tx_buffer *tx_buf;
+
+ desc.addr = xsk_buff_xdp_get_dma(xdp);
+ xsk_buff_raw_dma_sync_for_device(sq->pool, desc.addr, desc.len);
+
+ tx_buf = &sq->tx_buf[*sq->next_to_use];
+ tx_buf->type = LIBIE_TX_BUF_XSK_TX;
+ tx_buf->gso_segs = 1;
+ tx_buf->bytecount = desc.len;
+ tx_buf->xdp = xdp;
+
+ return desc;
+}
+
+#define libie_xsk_tx_flush_bulk(bq, prep, xmit) \
+ __libie_xdp_tx_flush_bulk(bq, prep, libie_xsk_tx_fill_buf, xmit)
+
+/* XSk xmit implementation */
+
+#define libie_xsk_xmit_init_bulk(bq, xdpq) \
+ __libie_xdp_tx_init_bulk(bq, NULL, NULL, xdpq)
+
+static inline struct libie_xdp_tx_desc
+libie_xsk_xmit_fill_buf(const struct libie_xdp_tx_frame *frm,
+ const struct libie_xdp_tx_queue *sq)
+{
+ struct libie_xdp_tx_desc desc = {
+ .len = frm->desc.len,
+ };
+
+ desc.addr = xsk_buff_raw_get_dma(sq->pool, frm->desc.addr);
+ xsk_buff_raw_dma_sync_for_device(sq->pool, desc.addr, desc.len);
+
+ return desc;
+}
+
+static __always_inline bool
+libie_xsk_xmit_do_bulk(void *xdpq, struct xsk_buff_pool *pool, u32 budget,
+ u32 (*prep)(void *xdpq, struct libie_xdp_tx_queue *sq),
+ void (*xmit)(struct libie_xdp_tx_desc desc,
+ const struct libie_xdp_tx_queue *sq),
+ void (*finalize)(void *xdpq, bool tail))
+{
+ struct libie_xdp_tx_bulk bq;
+ u32 n, batched;
+
+ n = xsk_tx_peek_release_desc_batch(pool, budget);
+ if (unlikely(!n))
+ return true;
+
+ batched = ALIGN_DOWN(n, LIBIE_XDP_TX_BULK);
+
+ libie_xsk_xmit_init_bulk(&bq, xdpq);
+ bq.count = LIBIE_XDP_TX_BULK;
+
+ for (u32 i = 0; i < batched; i += LIBIE_XDP_TX_BULK) {
+ memcpy(bq.bulk, &pool->tx_descs[i], sizeof(bq.bulk));
+ libie_xdp_tx_xmit_bulk(&bq, prep, libie_xsk_xmit_fill_buf,
+ xmit);
+ }
+
+ bq.count = n - batched;
+
+ memcpy(bq.bulk, &pool->tx_descs[batched], bq.count * sizeof(*bq.bulk));
+ libie_xdp_tx_xmit_bulk(&bq, prep, libie_xsk_xmit_fill_buf, xmit);
+
+ finalize(bq.xdpq, true);
+
+ if (xsk_uses_need_wakeup(pool))
+ xsk_set_tx_need_wakeup(pool);
+
+ return n < budget;
+}
+
+/* Rx polling path */
+
+/**
+ * __libie_xsk_run_prog - run XDP program on an XDP buffer
+ * @xdp: XDP buffer to run the prog on
+ * @bq: buffer bulk for ``XDP_TX`` queueing
+ *
+ * Return: LIBIE_XDP_{PASS,DROP,ABORTED,TX,REDIRECT} depending on the prog's
+ * verdict.
+ */
+static inline u32 __libie_xsk_run_prog(struct xdp_buff *xdp,
+ struct libie_xdp_tx_bulk *bq)
+{
+ const struct bpf_prog *prog = bq->prog;
+ u32 act, drop = LIBIE_XDP_DROP;
+ struct xdp_buff_xsk *xsk;
+ int ret;
+
+ act = bpf_prog_run_xdp(prog, xdp);
+ if (unlikely(act != XDP_REDIRECT))
+ goto rest;
+
+ ret = xdp_do_redirect(bq->dev, xdp, prog);
+ if (unlikely(ret))
+ goto check_err;
+
+ return LIBIE_XDP_REDIRECT;
+
+rest:
+ switch (act) {
+ case XDP_ABORTED:
+err:
+ trace_xdp_exception(bq->dev, prog, act);
+ fallthrough;
+ case XDP_DROP:
+ xsk_buff_free(xdp);
+
+ return drop;
+ case XDP_PASS:
+ return LIBIE_XDP_PASS;
+ case XDP_TX:
+ libie_xsk_tx_queue_bulk(bq, xdp);
+
+ return LIBIE_XDP_TX;
+ default:
+ bpf_warn_invalid_xdp_action(bq->dev, prog, act);
+ goto err;
+ }
+
+check_err:
+ xsk = container_of(xdp, typeof(*xsk), xdp);
+ if (xsk_uses_need_wakeup(xsk->pool) && ret == -ENOBUFS)
+ drop = LIBIE_XDP_ABORTED;
+
+ goto err;
+}
+
+#define libie_xsk_run_prog(xdp, bq, fl) \
+ __libie_xdp_run_flush(xdp, bq, __libie_xsk_run_prog, fl)
+
+/* Externals */
+
+int libie_xsk_enable_pool(struct net_device *dev, u32 qid, unsigned long *map);
+int libie_xsk_disable_pool(struct net_device *dev, u32 qid,
+ unsigned long *map);
+
+#endif /* __LIBIE_XSK_H */
--
2.43.0
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