#ifndef _GNU_SOURCE # define _GNU_SOURCE #endif #include #include #include #include #include #include #include #include #include #include "die.h" #include "dev.h" #include "ioops.h" #include "str.h" #include "built_in.h" int open_or_die(const char *file, int flags) { int ret = open(file, flags); if (unlikely(ret < 0)) panic("Cannot open file %s! %s.\n", file, strerror(errno)); return ret; } int open_or_die_m(const char *file, int flags, mode_t mode) { int ret = open(file, flags, mode); if (unlikely(ret < 0)) panic("Cannot open or create file %s! %s.", file, strerror(errno)); return ret; } int dup_or_die(int oldfd) { int newfd = dup(oldfd); if (unlikely(newfd < 0)) panic("Cannot dup old file descriptor!\n"); return newfd; } void dup2_or_die(int oldfd, int newfd) { int ret = dup2(oldfd, newfd); if (unlikely(ret < 0)) panic("Cannot dup2 old/new file descriptor!\n"); } void create_or_die(const char *file, mode_t mode) { int fd = open_or_die_m(file, O_WRONLY | O_CREAT, mode); close(fd); } int mkostemp_or_die(char *templ, int flags) { /* mode is 0600 (S_IRUSR | S_IWUSR) by default */ int fd = mkostemp(templ, flags); if (unlikely(fd < 0)) panic("Cannot create unique temporary file! %s\n", strerror(errno)); return fd; } void pipe_or_die(int pipefd[2], int flags) { int ret = pipe2(pipefd, flags); if (unlikely(ret < 0)) panic("Cannot create pipe2 event fd! %s.\n", strerror(errno)); } int tun_open_or_die(const char *name, int type) { int fd, ret; short flags; struct ifreq ifr; if (unlikely(!name)) panic("No name provided for tundev!\n"); fd = open_or_die("/dev/net/tun", O_RDWR); memset(&ifr, 0, sizeof(ifr)); ifr.ifr_flags = type; strlcpy(ifr.ifr_name, name, IFNAMSIZ); ret = ioctl(fd, TUNSETIFF, &ifr); if (unlikely(ret < 0)) panic("ioctl screwed up! %s.\n", strerror(errno)); ret = fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK); if (unlikely(ret < 0)) panic("fctnl screwed up! %s.\n", strerror(errno)); flags = device_get_flags(name); flags |= IFF_UP | IFF_RUNNING; device_set_flags(name, flags); return fd; } ssize_t read_or_die(int fd, void *buf, size_t len) { ssize_t ret = read(fd, buf, len); if (unlikely(ret < 0)) { if (errno == EPIPE) die(); panic("Cannot read from descriptor! %s.\n", strerror(errno)); } return ret; } ssize_t write_or_die(int fd, const void *buf, size_t len) { ssize_t ret = write(fd, buf, len); if (unlikely(ret < 0)) { if (errno == EPIPE) die(); panic("Cannot write to descriptor! %s.", strerror(errno)); } return ret; } int read_blob_or_die(const char *file, void *blob, size_t count) { int fd, ret; fd = open_or_die(file, O_RDONLY); ret = read_or_die(fd, blob, count); close(fd); return ret; } int write_blob_or_die(const char *file, const void *blob, size_t count) { int fd, ret; fd = open_or_die_m(file, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR); ret = write_or_die(fd, blob, count); fdatasync(fd); close(fd); return ret; } 10space:mode:

author	Marc Kleine-Budde <mkl@pengutronix.de>	2015-05-10 15:26:58 +0200
committer	Marc Kleine-Budde <mkl@pengutronix.de>	2017-02-06 15:13:39 +0100
commit	30164759db1bb1062bdf0f92451f57ed295cfa48 (patch)
tree	87cf035dffe14e26a0e12a7e169e5caff5f7311d
parent	b93917c3700636dadc6688144e7d55e07699367b (diff)

can: flexcan: make use of rx-offload's irq_offload_fifo

This patch converts the flexcan driver to make use of the rx-offload can_rx_offload_irq_offload_fifo() helper function. The idea is to read the CAN frames already in the interrupt context, as the depth of the flexcan HW FIFO is too shallow, resulting in too many missed frames. During a normal NAPI poll the frames are the pushed into the upper layers. Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

Diffstat

-rw-r--r--

drivers/net/can/flexcan.c

164

1 files changed, 52 insertions, 112 deletions