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  4. rte_bpf_eth_rx_elf_load(3)

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rte_bpf_ethdev.h(3) DPDK rte_bpf_ethdev.h(3)

NAME

rte_bpf_ethdev.h

SYNOPSIS

#include <rte_bpf.h>

Functions


void rte_bpf_eth_rx_unload (uint16_t port, uint16_t queue)
void rte_bpf_eth_tx_unload (uint16_t port, uint16_t queue)
int rte_bpf_eth_rx_elf_load (uint16_t port, uint16_t queue, const struct rte_bpf_prm *prm, const char *fname, const char *sname, uint32_t flags)
int rte_bpf_eth_tx_elf_load (uint16_t port, uint16_t queue, const struct rte_bpf_prm *prm, const char *fname, const char *sname, uint32_t flags)

Detailed Description

API to install BPF filter as RX/TX callbacks for eth devices. Note that right now:

  • it is not MT safe, i.e. it is not allowed to do load/unload for the same port/queue from different threads in parallel.
  • though it allows to do load/unload at runtime (while RX/TX is ongoing on given port/queue).
  • allows only one BPF program per port/queue, i.e. new load will replace previously loaded for that port/queue BPF program. Filter behaviour - if BPF program returns zero value for a given packet, then it will be dropped inside callback and no further processing on RX - it will be dropped inside callback and no further processing for that packet will happen. on TX - packet will remain unsent, and it is responsibility of the user to handle such situation (drop, try to send again, etc.).

Definition in file rte_bpf_ethdev.h.

Function Documentation

void rte_bpf_eth_rx_unload (uint16_t port, uint16_t queue)

Unload previously loaded BPF program (if any) from given RX port/queue and remove appropriate RX port/queue callback.

Parameters:

port The identifier of the ethernet port
queue The identifier of the RX queue on the given port

void rte_bpf_eth_tx_unload (uint16_t port, uint16_t queue)

Unload previously loaded BPF program (if any) from given TX port/queue and remove appropriate TX port/queue callback.

Parameters:

port The identifier of the ethernet port
queue The identifier of the TX queue on the given port

int rte_bpf_eth_rx_elf_load (uint16_t port, uint16_t queue, const struct rte_bpf_prm * prm, const char * fname, const char * sname, uint32_t flags)

Load BPF program from the ELF file and install callback to execute it on given RX port/queue.

Parameters:

port The identifier of the ethernet port
queue The identifier of the RX queue on the given port
fname Pathname for a ELF file.
sname Name of the executable section within the file to load.
prm Parameters used to create and initialise the BPF execution context.
flags Flags that define expected behavior of the loaded filter (i.e. jited/non-jited version to use).

Returns:

Zero on successful completion or negative error code otherwise.

int rte_bpf_eth_tx_elf_load (uint16_t port, uint16_t queue, const struct rte_bpf_prm * prm, const char * fname, const char * sname, uint32_t flags)

Load BPF program from the ELF file and install callback to execute it on given TX port/queue.

Parameters:

port The identifier of the ethernet port
queue The identifier of the TX queue on the given port
fname Pathname for a ELF file.
sname Name of the executable section within the file to load.
prm Parameters used to create and initialise the BPF execution context.
flags Flags that define expected behavior of the loaded filter (i.e. jited/non-jited version to use).

Returns:

Zero on successful completion or negative error code otherwise.

Author

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Thu May 23 2024 Version 23.11.0