5.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Toke Høiland-Jørgensen <toke@xxxxxxxxxx> [ Upstream commit 4a48ef70b93b8c7ed5190adfca18849e76387b80 ] 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@xxxxxxxxxx> Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx> Link: https://lore.kernel.org/bpf/20220103150812.87914-2-toke@xxxxxxxxxx Stable-dep-of: 7e9f79428372 ("xdp: Remove WARN() from __xdp_reg_mem_model()") Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- include/net/xdp.h | 3 ++ net/core/xdp.c | 92 +++++++++++++++++++++++++++++++---------------- 2 files changed, 65 insertions(+), 30 deletions(-) diff --git a/include/net/xdp.h b/include/net/xdp.h index 9dab2bc6f187b..9e6c10b323b8e 100644 --- a/include/net/xdp.h +++ b/include/net/xdp.h @@ -218,6 +218,9 @@ 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. diff --git a/net/core/xdp.c b/net/core/xdp.c index 0f0b65981614b..6e6b89d5f77ed 100644 --- a/net/core/xdp.c +++ b/net/core/xdp.c @@ -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) @@ -260,28 +266,24 @@ 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 */ @@ -291,13 +293,13 @@ 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); @@ -305,15 +307,15 @@ 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; } @@ -323,13 +325,43 @@ 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 -- 2.43.0
