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env/dpdk: retry SO_RCVBUF if SO_RCVBUFFORCE fails

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PCI event module currently requires use of SO_RCVBUFFORCE socket option
which is restricted to CAP_NET_ADMIN. Retry with SO_RCVBUF for non-root
(unprivileged) processes where this capability is not available.

Return -ENOSPC if receive buffer is not of sufficient size.

Fixes issue #2224

Signed-off-by: Tom Nabarro <tom.nabarro@intel.com>
Change-Id: I0bed1b1eac0c7e8601d3d172d8027380ec8be391
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/10126
Community-CI: Broadcom CI <spdk-ci.pdl@broadcom.com>
Community-CI: Mellanox Build Bot
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Dong Yi <dongx.yi@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
This commit is contained in:
Tom Nabarro 2021-11-04 15:25:54 -04:00 committed by Jim Harris
parent fded6f0d6d
commit 148a9ab0c0
1 changed files with 26 additions and 10 deletions
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36
lib/env_dpdk/pci_event.c
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@ -50,6 +50,8 @@ spdk_pci_event_listen(void)
struct sockaddr_nl addr;
int netlink_fd;
int size = SPDK_UEVENT_RECVBUF_SIZE;
int buf_size;
socklen_t opt_size;
int flag, rc;
memset(&addr, 0, sizeof(addr));
@ -64,35 +66,49 @@ spdk_pci_event_listen(void)
}
if (setsockopt(netlink_fd, SOL_SOCKET, SO_RCVBUFFORCE, &size, sizeof(size)) < 0) {
rc = errno;
SPDK_ERRLOG("Failed to set socket option\n");
close(netlink_fd);
return -rc;
if (setsockopt(netlink_fd, SOL_SOCKET, SO_RCVBUF, &size, sizeof(size)) < 0) {
rc = errno;
SPDK_ERRLOG("Failed to set socket option SO_RCVBUF\n");
goto error;
}
opt_size = sizeof(buf_size);
if (getsockopt(netlink_fd, SOL_SOCKET, SO_RCVBUF, &buf_size, &opt_size) < 0) {
rc = errno;
SPDK_ERRLOG("Failed to get socket option SO_RCVBUF\n");
goto error;
}
if (buf_size < SPDK_UEVENT_RECVBUF_SIZE) {
SPDK_ERRLOG("Socket recv buffer is too small (< %d), see SO_RCVBUF "
"section in socket(7) man page for specifics on how to "
"adjust the system setting.", SPDK_UEVENT_RECVBUF_SIZE);
rc = ENOSPC;
goto error;
}
}
flag = fcntl(netlink_fd, F_GETFL);
if (flag < 0) {
rc = errno;
SPDK_ERRLOG("Failed to get socket flag, fd: %d\n", netlink_fd);
close(netlink_fd);
return -rc;
goto error;
}
if (fcntl(netlink_fd, F_SETFL, flag | O_NONBLOCK) < 0) {
rc = errno;
SPDK_ERRLOG("Fcntl can't set nonblocking mode for socket, fd: %d\n", netlink_fd);
close(netlink_fd);
return -rc;
goto error;
}
if (bind(netlink_fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
rc = errno;
SPDK_ERRLOG("Failed to bind the netlink\n");
close(netlink_fd);
return -rc;
goto error;
}
return netlink_fd;
error:
close(netlink_fd);
return -rc;
}
/* Note: We parse the event from uio and vfio subsystem and will ignore