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xsk: prepare both copy and zero-copy modes to co-exist 

Currently, __xsk_rcv_zc() is a function that is responsible for
producing AF_XDP Rx descriptors. It is used by both copy and zero-copy
mode. Both of these modes are going to differ when multi-buffer support
is going to be added. ZC will work on a chain of xdp_buff_xsk structs
whereas copy-mode is going to utilize skb_shared_info contents. This
means that ZC-specific changes would affect the copy mode.

Let's modify __xsk_rcv_zc() to work directly on xdp_buff_xsk so the
callsites have to retrieve this from xdp_buff. Also, introduce
xsk_rcv_zc() which will carry all the needed later changes for
supporting multi-buffer on ZC side that do not apply to copy mode.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Link: https://lore.kernel.org/r/20230719132421.584801-4-maciej.fijalkowski@intel.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Maciej Fijalkowski 2023-07-19 15:24:00 +02:00 committed by Alexei Starovoitov
parent 81470b5c3c
commit 556444c4e6
1 changed files with 13 additions and 4 deletions
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17
net/xdp/xsk.c
View File

@ -135,9 +135,9 @@ int xsk_reg_pool_at_qid(struct net_device *dev, struct xsk_buff_pool *pool,
return 0;
}
static int __xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len, u32 flags)
static int __xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff_xsk *xskb, u32 len,
u32 flags)
{
struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
u64 addr;
int err;
@ -152,6 +152,13 @@ static int __xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len, u32
return 0;
}
static int xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len)
{
struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
return __xsk_rcv_zc(xs, xskb, len, 0);
}
static void xsk_copy_xdp(struct xdp_buff *to, struct xdp_buff *from, u32 len)
{
void *from_buf, *to_buf;
@ -172,6 +179,7 @@ static void xsk_copy_xdp(struct xdp_buff *to, struct xdp_buff *from, u32 len)
static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
{
struct xdp_buff_xsk *xskb;
struct xdp_buff *xsk_xdp;
int err;
u32 len;
@ -189,7 +197,8 @@ static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
}
xsk_copy_xdp(xsk_xdp, xdp, len);
err = __xsk_rcv_zc(xs, xsk_xdp, len, 0);
xskb = container_of(xsk_xdp, struct xdp_buff_xsk, xdp);
err = __xsk_rcv_zc(xs, xskb, len, 0);
if (err) {
xsk_buff_free(xsk_xdp);
return err;
@ -259,7 +268,7 @@ static int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
if (xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL) {
len = xdp->data_end - xdp->data;
return __xsk_rcv_zc(xs, xdp, len, 0);
return xsk_rcv_zc(xs, xdp, len);
}
err = __xsk_rcv(xs, xdp);