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xdp: Allow registering memory model without rxq reference

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The functions that register an XDP memory model take a struct xdp_rxq as
parameter, but the RXQ is not actually used for anything other than pulling
out the struct xdp_mem_info that it embeds. So refactor the register
functions and export variants that just take a pointer to the xdp_mem_info.

This is in preparation for enabling XDP_REDIRECT in bpf_prog_run(), using a
page_pool instance that is not connected to any network device.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220103150812.87914-2-toke@redhat.com
This commit is contained in:
Toke Høiland-Jørgensen 2022-01-03 16:08:06 +01:00 committed by Alexei Starovoitov
parent 640a171c93
commit 4a48ef70b9
2 changed files with 65 additions and 30 deletions
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3
include/net/xdp.h
View file

@ -260,6 +260,9 @@ bool xdp_rxq_info_is_reg(struct xdp_rxq_info *xdp_rxq);
int xdp_rxq_info_reg_mem_model(struct xdp_rxq_info *xdp_rxq,
enum xdp_mem_type type, void *allocator);
void xdp_rxq_info_unreg_mem_model(struct xdp_rxq_info *xdp_rxq);
int xdp_reg_mem_model(struct xdp_mem_info *mem,
enum xdp_mem_type type, void *allocator);
void xdp_unreg_mem_model(struct xdp_mem_info *mem);
/* Drivers not supporting XDP metadata can use this helper, which
* rejects any room expansion for metadata as a result.

92
net/core/xdp.c
View file

@ -110,20 +110,15 @@ static void mem_allocator_disconnect(void *allocator)
mutex_unlock(&mem_id_lock);
}
void xdp_rxq_info_unreg_mem_model(struct xdp_rxq_info *xdp_rxq)
void xdp_unreg_mem_model(struct xdp_mem_info *mem)
{
struct xdp_mem_allocator *xa;
int type = xdp_rxq->mem.type;
int id = xdp_rxq->mem.id;
int type = mem->type;
int id = mem->id;
/* Reset mem info to defaults */
xdp_rxq->mem.id = 0;
xdp_rxq->mem.type = 0;
if (xdp_rxq->reg_state != REG_STATE_REGISTERED) {
WARN(1, "Missing register, driver bug");
return;
}
mem->id = 0;
mem->type = 0;
if (id == 0)
return;
@ -135,6 +130,17 @@ void xdp_rxq_info_unreg_mem_model(struct xdp_rxq_info *xdp_rxq)
rcu_read_unlock();
}
}
EXPORT_SYMBOL_GPL(xdp_unreg_mem_model);
void xdp_rxq_info_unreg_mem_model(struct xdp_rxq_info *xdp_rxq)
{
if (xdp_rxq->reg_state != REG_STATE_REGISTERED) {
WARN(1, "Missing register, driver bug");
return;
}
xdp_unreg_mem_model(&xdp_rxq->mem);
}
EXPORT_SYMBOL_GPL(xdp_rxq_info_unreg_mem_model);
void xdp_rxq_info_unreg(struct xdp_rxq_info *xdp_rxq)
@ -259,28 +265,24 @@ static bool __is_supported_mem_type(enum xdp_mem_type type)
return true;
}
int xdp_rxq_info_reg_mem_model(struct xdp_rxq_info *xdp_rxq,
enum xdp_mem_type type, void *allocator)
static struct xdp_mem_allocator *__xdp_reg_mem_model(struct xdp_mem_info *mem,
enum xdp_mem_type type,
void *allocator)
{
struct xdp_mem_allocator *xdp_alloc;
gfp_t gfp = GFP_KERNEL;
int id, errno, ret;
void *ptr;
if (xdp_rxq->reg_state != REG_STATE_REGISTERED) {
WARN(1, "Missing register, driver bug");
return -EFAULT;
}
if (!__is_supported_mem_type(type))
return -EOPNOTSUPP;
return ERR_PTR(-EOPNOTSUPP);
xdp_rxq->mem.type = type;
mem->type = type;
if (!allocator) {
if (type == MEM_TYPE_PAGE_POOL)
return -EINVAL; /* Setup time check page_pool req */
return 0;
return ERR_PTR(-EINVAL); /* Setup time check page_pool req */
return NULL;
}
/* Delay init of rhashtable to save memory if feature isn't used */
@ -290,13 +292,13 @@ int xdp_rxq_info_reg_mem_model(struct xdp_rxq_info *xdp_rxq,
mutex_unlock(&mem_id_lock);
if (ret < 0) {
WARN_ON(1);
return ret;
return ERR_PTR(ret);
}
}
xdp_alloc = kzalloc(sizeof(*xdp_alloc), gfp);
if (!xdp_alloc)
return -ENOMEM;
return ERR_PTR(-ENOMEM);
mutex_lock(&mem_id_lock);
id = __mem_id_cyclic_get(gfp);
@ -304,15 +306,15 @@ int xdp_rxq_info_reg_mem_model(struct xdp_rxq_info *xdp_rxq,
errno = id;
goto err;
}
xdp_rxq->mem.id = id;
xdp_alloc->mem = xdp_rxq->mem;
mem->id = id;
xdp_alloc->mem = *mem;
xdp_alloc->allocator = allocator;
/* Insert allocator into ID lookup table */
ptr = rhashtable_insert_slow(mem_id_ht, &id, &xdp_alloc->node);
if (IS_ERR(ptr)) {
ida_simple_remove(&mem_id_pool, xdp_rxq->mem.id);
xdp_rxq->mem.id = 0;
ida_simple_remove(&mem_id_pool, mem->id);
mem->id = 0;
errno = PTR_ERR(ptr);
goto err;
}
@ -322,13 +324,43 @@ int xdp_rxq_info_reg_mem_model(struct xdp_rxq_info *xdp_rxq,
mutex_unlock(&mem_id_lock);
trace_mem_connect(xdp_alloc, xdp_rxq);
return 0;
return xdp_alloc;
err:
mutex_unlock(&mem_id_lock);
kfree(xdp_alloc);
return errno;
return ERR_PTR(errno);
}
int xdp_reg_mem_model(struct xdp_mem_info *mem,
enum xdp_mem_type type, void *allocator)
{
struct xdp_mem_allocator *xdp_alloc;
xdp_alloc = __xdp_reg_mem_model(mem, type, allocator);
if (IS_ERR(xdp_alloc))
return PTR_ERR(xdp_alloc);
return 0;
}
EXPORT_SYMBOL_GPL(xdp_reg_mem_model);
int xdp_rxq_info_reg_mem_model(struct xdp_rxq_info *xdp_rxq,
enum xdp_mem_type type, void *allocator)
{
struct xdp_mem_allocator *xdp_alloc;
if (xdp_rxq->reg_state != REG_STATE_REGISTERED) {
WARN(1, "Missing register, driver bug");
return -EFAULT;
}
xdp_alloc = __xdp_reg_mem_model(&xdp_rxq->mem, type, allocator);
if (IS_ERR(xdp_alloc))
return PTR_ERR(xdp_alloc);
trace_mem_connect(xdp_alloc, xdp_rxq);
return 0;
}
EXPORT_SYMBOL_GPL(xdp_rxq_info_reg_mem_model);
/* XDP RX runs under NAPI protection, and in different delivery error