linux/include/net/xdp_sock_drv.h
Maciej Fijalkowski 24ea50127e xsk: support mbuf on ZC RX
Given that skb_shared_info relies on skb_frag_t, in order to support
xskb chaining, introduce xdp_buff_xsk::xskb_list_node and
xsk_buff_pool::xskb_list.

This is needed so ZC drivers can add frags as xskb nodes which will make
it possible to handle it both when producing AF_XDP Rx descriptors as
well as freeing/recycling all the frags that a single frame carries.

Speaking of latter, update xsk_buff_free() to take care of list nodes.
For the former (adding as frags), introduce xsk_buff_add_frag() for ZC
drivers usage that is going to be used to add a frag to xskb list from
pool.

xsk_buff_get_frag() will be utilized by XDP_TX and, on contrary, will
return xdp_buff.

One of the previous patches added a wrapper for ZC Rx so implement xskb
list walk and production of Rx descriptors there.

On bind() path, bail out if socket wants to use ZC multi-buffer but
underlying netdev does not support it.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Link: https://lore.kernel.org/r/20230719132421.584801-12-maciej.fijalkowski@intel.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2023-07-19 09:56:49 -07:00

340 lines
7.6 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
/* Interface for implementing AF_XDP zero-copy support in drivers.
* Copyright(c) 2020 Intel Corporation.
*/
#ifndef _LINUX_XDP_SOCK_DRV_H
#define _LINUX_XDP_SOCK_DRV_H
#include <net/xdp_sock.h>
#include <net/xsk_buff_pool.h>
#define XDP_UMEM_MIN_CHUNK_SHIFT 11
#define XDP_UMEM_MIN_CHUNK_SIZE (1 << XDP_UMEM_MIN_CHUNK_SHIFT)
#ifdef CONFIG_XDP_SOCKETS
void xsk_tx_completed(struct xsk_buff_pool *pool, u32 nb_entries);
bool xsk_tx_peek_desc(struct xsk_buff_pool *pool, struct xdp_desc *desc);
u32 xsk_tx_peek_release_desc_batch(struct xsk_buff_pool *pool, u32 max);
void xsk_tx_release(struct xsk_buff_pool *pool);
struct xsk_buff_pool *xsk_get_pool_from_qid(struct net_device *dev,
u16 queue_id);
void xsk_set_rx_need_wakeup(struct xsk_buff_pool *pool);
void xsk_set_tx_need_wakeup(struct xsk_buff_pool *pool);
void xsk_clear_rx_need_wakeup(struct xsk_buff_pool *pool);
void xsk_clear_tx_need_wakeup(struct xsk_buff_pool *pool);
bool xsk_uses_need_wakeup(struct xsk_buff_pool *pool);
static inline u32 xsk_pool_get_headroom(struct xsk_buff_pool *pool)
{
return XDP_PACKET_HEADROOM + pool->headroom;
}
static inline u32 xsk_pool_get_chunk_size(struct xsk_buff_pool *pool)
{
return pool->chunk_size;
}
static inline u32 xsk_pool_get_rx_frame_size(struct xsk_buff_pool *pool)
{
return xsk_pool_get_chunk_size(pool) - xsk_pool_get_headroom(pool);
}
static inline void xsk_pool_set_rxq_info(struct xsk_buff_pool *pool,
struct xdp_rxq_info *rxq)
{
xp_set_rxq_info(pool, rxq);
}
static inline unsigned int xsk_pool_get_napi_id(struct xsk_buff_pool *pool)
{
#ifdef CONFIG_NET_RX_BUSY_POLL
return pool->heads[0].xdp.rxq->napi_id;
#else
return 0;
#endif
}
static inline void xsk_pool_dma_unmap(struct xsk_buff_pool *pool,
unsigned long attrs)
{
xp_dma_unmap(pool, attrs);
}
static inline int xsk_pool_dma_map(struct xsk_buff_pool *pool,
struct device *dev, unsigned long attrs)
{
struct xdp_umem *umem = pool->umem;
return xp_dma_map(pool, dev, attrs, umem->pgs, umem->npgs);
}
static inline dma_addr_t xsk_buff_xdp_get_dma(struct xdp_buff *xdp)
{
struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
return xp_get_dma(xskb);
}
static inline dma_addr_t xsk_buff_xdp_get_frame_dma(struct xdp_buff *xdp)
{
struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
return xp_get_frame_dma(xskb);
}
static inline struct xdp_buff *xsk_buff_alloc(struct xsk_buff_pool *pool)
{
return xp_alloc(pool);
}
static inline bool xsk_is_eop_desc(struct xdp_desc *desc)
{
return !xp_mb_desc(desc);
}
/* Returns as many entries as possible up to max. 0 <= N <= max. */
static inline u32 xsk_buff_alloc_batch(struct xsk_buff_pool *pool, struct xdp_buff **xdp, u32 max)
{
return xp_alloc_batch(pool, xdp, max);
}
static inline bool xsk_buff_can_alloc(struct xsk_buff_pool *pool, u32 count)
{
return xp_can_alloc(pool, count);
}
static inline void xsk_buff_free(struct xdp_buff *xdp)
{
struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
struct list_head *xskb_list = &xskb->pool->xskb_list;
struct xdp_buff_xsk *pos, *tmp;
if (likely(!xdp_buff_has_frags(xdp)))
goto out;
list_for_each_entry_safe(pos, tmp, xskb_list, xskb_list_node) {
list_del(&pos->xskb_list_node);
xp_free(pos);
}
xdp_get_shared_info_from_buff(xdp)->nr_frags = 0;
out:
xp_free(xskb);
}
static inline void xsk_buff_add_frag(struct xdp_buff *xdp)
{
struct xdp_buff_xsk *frag = container_of(xdp, struct xdp_buff_xsk, xdp);
list_add_tail(&frag->xskb_list_node, &frag->pool->xskb_list);
}
static inline struct xdp_buff *xsk_buff_get_frag(struct xdp_buff *first)
{
struct xdp_buff_xsk *xskb = container_of(first, struct xdp_buff_xsk, xdp);
struct xdp_buff *ret = NULL;
struct xdp_buff_xsk *frag;
frag = list_first_entry_or_null(&xskb->pool->xskb_list,
struct xdp_buff_xsk, xskb_list_node);
if (frag) {
list_del(&frag->xskb_list_node);
ret = &frag->xdp;
}
return ret;
}
static inline void xsk_buff_set_size(struct xdp_buff *xdp, u32 size)
{
xdp->data = xdp->data_hard_start + XDP_PACKET_HEADROOM;
xdp->data_meta = xdp->data;
xdp->data_end = xdp->data + size;
}
static inline dma_addr_t xsk_buff_raw_get_dma(struct xsk_buff_pool *pool,
u64 addr)
{
return xp_raw_get_dma(pool, addr);
}
static inline void *xsk_buff_raw_get_data(struct xsk_buff_pool *pool, u64 addr)
{
return xp_raw_get_data(pool, addr);
}
static inline void xsk_buff_dma_sync_for_cpu(struct xdp_buff *xdp, struct xsk_buff_pool *pool)
{
struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
if (!pool->dma_need_sync)
return;
xp_dma_sync_for_cpu(xskb);
}
static inline void xsk_buff_raw_dma_sync_for_device(struct xsk_buff_pool *pool,
dma_addr_t dma,
size_t size)
{
xp_dma_sync_for_device(pool, dma, size);
}
#else
static inline void xsk_tx_completed(struct xsk_buff_pool *pool, u32 nb_entries)
{
}
static inline bool xsk_tx_peek_desc(struct xsk_buff_pool *pool,
struct xdp_desc *desc)
{
return false;
}
static inline u32 xsk_tx_peek_release_desc_batch(struct xsk_buff_pool *pool, u32 max)
{
return 0;
}
static inline void xsk_tx_release(struct xsk_buff_pool *pool)
{
}
static inline struct xsk_buff_pool *
xsk_get_pool_from_qid(struct net_device *dev, u16 queue_id)
{
return NULL;
}
static inline void xsk_set_rx_need_wakeup(struct xsk_buff_pool *pool)
{
}
static inline void xsk_set_tx_need_wakeup(struct xsk_buff_pool *pool)
{
}
static inline void xsk_clear_rx_need_wakeup(struct xsk_buff_pool *pool)
{
}
static inline void xsk_clear_tx_need_wakeup(struct xsk_buff_pool *pool)
{
}
static inline bool xsk_uses_need_wakeup(struct xsk_buff_pool *pool)
{
return false;
}
static inline u32 xsk_pool_get_headroom(struct xsk_buff_pool *pool)
{
return 0;
}
static inline u32 xsk_pool_get_chunk_size(struct xsk_buff_pool *pool)
{
return 0;
}
static inline u32 xsk_pool_get_rx_frame_size(struct xsk_buff_pool *pool)
{
return 0;
}
static inline void xsk_pool_set_rxq_info(struct xsk_buff_pool *pool,
struct xdp_rxq_info *rxq)
{
}
static inline unsigned int xsk_pool_get_napi_id(struct xsk_buff_pool *pool)
{
return 0;
}
static inline void xsk_pool_dma_unmap(struct xsk_buff_pool *pool,
unsigned long attrs)
{
}
static inline int xsk_pool_dma_map(struct xsk_buff_pool *pool,
struct device *dev, unsigned long attrs)
{
return 0;
}
static inline dma_addr_t xsk_buff_xdp_get_dma(struct xdp_buff *xdp)
{
return 0;
}
static inline dma_addr_t xsk_buff_xdp_get_frame_dma(struct xdp_buff *xdp)
{
return 0;
}
static inline struct xdp_buff *xsk_buff_alloc(struct xsk_buff_pool *pool)
{
return NULL;
}
static inline bool xsk_is_eop_desc(struct xdp_desc *desc)
{
return false;
}
static inline u32 xsk_buff_alloc_batch(struct xsk_buff_pool *pool, struct xdp_buff **xdp, u32 max)
{
return 0;
}
static inline bool xsk_buff_can_alloc(struct xsk_buff_pool *pool, u32 count)
{
return false;
}
static inline void xsk_buff_free(struct xdp_buff *xdp)
{
}
static inline void xsk_buff_add_frag(struct xdp_buff *xdp)
{
}
static inline struct xdp_buff *xsk_buff_get_frag(struct xdp_buff *first)
{
return NULL;
}
static inline void xsk_buff_set_size(struct xdp_buff *xdp, u32 size)
{
}
static inline dma_addr_t xsk_buff_raw_get_dma(struct xsk_buff_pool *pool,
u64 addr)
{
return 0;
}
static inline void *xsk_buff_raw_get_data(struct xsk_buff_pool *pool, u64 addr)
{
return NULL;
}
static inline void xsk_buff_dma_sync_for_cpu(struct xdp_buff *xdp, struct xsk_buff_pool *pool)
{
}
static inline void xsk_buff_raw_dma_sync_for_device(struct xsk_buff_pool *pool,
dma_addr_t dma,
size_t size)
{
}
#endif /* CONFIG_XDP_SOCKETS */
#endif /* _LINUX_XDP_SOCK_DRV_H */