forked from Minki/linux
c0124f327e
The driver code qede_free_fp_array() depend on kfree() can be called with a NULL pointer. This stems from the qede_alloc_fp_array() function which either (kz)alloc memory for fp->txq or fp->rxq. This also simplifies error handling code in case of memory allocation failures, but xdp_rxq_info_unreg need to know the difference. Introduce xdp_rxq_info_is_reg() to handle if a memory allocation fails and detect this is the failure path by seeing that xdp_rxq_info was not registred yet, which first happens after successful alloaction in qede_init_fp(). Driver hook points for xdp_rxq_info: * reg : qede_init_fp * unreg: qede_free_fp_array Tested on actual hardware with samples/bpf program. V2: Driver have no proper error path for failed XDP RX-queue info reg, as qede_init_fp() is a void function. Cc: everest-linux-l2@cavium.com Cc: Ariel Elior <Ariel.Elior@cavium.com> Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
49 lines
1.7 KiB
C
49 lines
1.7 KiB
C
/* include/net/xdp.h
|
|
*
|
|
* Copyright (c) 2017 Jesper Dangaard Brouer, Red Hat Inc.
|
|
* Released under terms in GPL version 2. See COPYING.
|
|
*/
|
|
#ifndef __LINUX_NET_XDP_H__
|
|
#define __LINUX_NET_XDP_H__
|
|
|
|
/**
|
|
* DOC: XDP RX-queue information
|
|
*
|
|
* The XDP RX-queue info (xdp_rxq_info) is associated with the driver
|
|
* level RX-ring queues. It is information that is specific to how
|
|
* the driver have configured a given RX-ring queue.
|
|
*
|
|
* Each xdp_buff frame received in the driver carry a (pointer)
|
|
* reference to this xdp_rxq_info structure. This provides the XDP
|
|
* data-path read-access to RX-info for both kernel and bpf-side
|
|
* (limited subset).
|
|
*
|
|
* For now, direct access is only safe while running in NAPI/softirq
|
|
* context. Contents is read-mostly and must not be updated during
|
|
* driver NAPI/softirq poll.
|
|
*
|
|
* The driver usage API is a register and unregister API.
|
|
*
|
|
* The struct is not directly tied to the XDP prog. A new XDP prog
|
|
* can be attached as long as it doesn't change the underlying
|
|
* RX-ring. If the RX-ring does change significantly, the NIC driver
|
|
* naturally need to stop the RX-ring before purging and reallocating
|
|
* memory. In that process the driver MUST call unregistor (which
|
|
* also apply for driver shutdown and unload). The register API is
|
|
* also mandatory during RX-ring setup.
|
|
*/
|
|
|
|
struct xdp_rxq_info {
|
|
struct net_device *dev;
|
|
u32 queue_index;
|
|
u32 reg_state;
|
|
} ____cacheline_aligned; /* perf critical, avoid false-sharing */
|
|
|
|
int xdp_rxq_info_reg(struct xdp_rxq_info *xdp_rxq,
|
|
struct net_device *dev, u32 queue_index);
|
|
void xdp_rxq_info_unreg(struct xdp_rxq_info *xdp_rxq);
|
|
void xdp_rxq_info_unused(struct xdp_rxq_info *xdp_rxq);
|
|
bool xdp_rxq_info_is_reg(struct xdp_rxq_info *xdp_rxq);
|
|
|
|
#endif /* __LINUX_NET_XDP_H__ */
|