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libbpf: Support shared umems between queues and devices 

Add support for shared umems between hardware queues and devices to
the AF_XDP part of libbpf. This so that zero-copy can be achieved in
applications that want to send and receive packets between HW queues
on one device or between different devices/netdevs.

In order to create sockets that share a umem between hardware queues
and devices, a new function has been added called
xsk_socket__create_shared(). It takes the same arguments as
xsk_socket_create() plus references to a fill ring and a completion
ring. So for every socket that share a umem, you need to have one more
set of fill and completion rings. This in order to maintain the
single-producer single-consumer semantics of the rings.

You can create all the sockets via the new xsk_socket__create_shared()
call, or create the first one with xsk_socket__create() and the rest
with xsk_socket__create_shared(). Both methods work.

Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Björn Töpel <bjorn.topel@intel.com>
Link: https://lore.kernel.org/bpf/1598603189-32145-14-git-send-email-magnus.karlsson@intel.com
This commit is contained in:
Magnus Karlsson 2020-08-28 10:26:27 +02:00 committed by Daniel Borkmann
parent a1132430c2
commit 2f6324a393
3 changed files with 255 additions and 133 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
tools/lib/bpf/libbpf.map
View File

@ -306,4 +306,5 @@ LIBBPF_0.2.0 {
perf_buffer__buffer_fd;
perf_buffer__epoll_fd;
perf_buffer__consume_buffer;
xsk_socket__create_shared;
} LIBBPF_0.1.0;

378
tools/lib/bpf/xsk.c
View File

@ -20,6 +20,7 @@
#include <linux/if_ether.h>
#include <linux/if_packet.h>
#include <linux/if_xdp.h>
#include <linux/list.h>
#include <linux/sockios.h>
#include <net/if.h>
#include <sys/ioctl.h>
@ -45,26 +46,35 @@
#endif
struct xsk_umem {
struct xsk_ring_prod *fill;
struct xsk_ring_cons *comp;
struct xsk_ring_prod *fill_save;
struct xsk_ring_cons *comp_save;
char *umem_area;
struct xsk_umem_config config;
int fd;
int refcount;
struct list_head ctx_list;
};
struct xsk_ctx {
struct xsk_ring_prod *fill;
struct xsk_ring_cons *comp;
__u32 queue_id;
struct xsk_umem *umem;
int refcount;
int ifindex;
struct list_head list;
int prog_fd;
int xsks_map_fd;
char ifname[IFNAMSIZ];
};
struct xsk_socket {
struct xsk_ring_cons *rx;
struct xsk_ring_prod *tx;
__u64 outstanding_tx;
struct xsk_umem *umem;
struct xsk_ctx *ctx;
struct xsk_socket_config config;
int fd;
int ifindex;
int prog_fd;
int xsks_map_fd;
__u32 queue_id;
char ifname[IFNAMSIZ];
};
struct xsk_nl_info {
@ -200,15 +210,73 @@ static int xsk_get_mmap_offsets(int fd, struct xdp_mmap_offsets *off)
return -EINVAL;
}
static int xsk_create_umem_rings(struct xsk_umem *umem, int fd,
struct xsk_ring_prod *fill,
struct xsk_ring_cons *comp)
{
struct xdp_mmap_offsets off;
void *map;
int err;
err = setsockopt(fd, SOL_XDP, XDP_UMEM_FILL_RING,
&umem->config.fill_size,
sizeof(umem->config.fill_size));
if (err)
return -errno;
err = setsockopt(fd, SOL_XDP, XDP_UMEM_COMPLETION_RING,
&umem->config.comp_size,
sizeof(umem->config.comp_size));
if (err)
return -errno;
err = xsk_get_mmap_offsets(fd, &off);
if (err)
return -errno;
map = mmap(NULL, off.fr.desc + umem->config.fill_size * sizeof(__u64),
PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, fd,
XDP_UMEM_PGOFF_FILL_RING);
if (map == MAP_FAILED)
return -errno;
fill->mask = umem->config.fill_size - 1;
fill->size = umem->config.fill_size;
fill->producer = map + off.fr.producer;
fill->consumer = map + off.fr.consumer;
fill->flags = map + off.fr.flags;
fill->ring = map + off.fr.desc;
fill->cached_cons = umem->config.fill_size;
map = mmap(NULL, off.cr.desc + umem->config.comp_size * sizeof(__u64),
PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, fd,
XDP_UMEM_PGOFF_COMPLETION_RING);
if (map == MAP_FAILED) {
err = -errno;
goto out_mmap;
}
comp->mask = umem->config.comp_size - 1;
comp->size = umem->config.comp_size;
comp->producer = map + off.cr.producer;
comp->consumer = map + off.cr.consumer;
comp->flags = map + off.cr.flags;
comp->ring = map + off.cr.desc;
return 0;
out_mmap:
munmap(map, off.fr.desc + umem->config.fill_size * sizeof(__u64));
return err;
}
int xsk_umem__create_v0_0_4(struct xsk_umem **umem_ptr, void *umem_area,
__u64 size, struct xsk_ring_prod *fill,
struct xsk_ring_cons *comp,
const struct xsk_umem_config *usr_config)
{
struct xdp_mmap_offsets off;
struct xdp_umem_reg mr;
struct xsk_umem *umem;
void *map;
int err;
if (!umem_area || !umem_ptr || !fill || !comp)
@ -227,6 +295,7 @@ int xsk_umem__create_v0_0_4(struct xsk_umem **umem_ptr, void *umem_area,
}
umem->umem_area = umem_area;
INIT_LIST_HEAD(&umem->ctx_list);
xsk_set_umem_config(&umem->config, usr_config);
memset(&mr, 0, sizeof(mr));
@ -241,71 +310,16 @@ int xsk_umem__create_v0_0_4(struct xsk_umem **umem_ptr, void *umem_area,
err = -errno;
goto out_socket;
}
err = setsockopt(umem->fd, SOL_XDP, XDP_UMEM_FILL_RING,
&umem->config.fill_size,
sizeof(umem->config.fill_size));
if (err) {
err = -errno;
err = xsk_create_umem_rings(umem, umem->fd, fill, comp);
if (err)
goto out_socket;
}
err = setsockopt(umem->fd, SOL_XDP, XDP_UMEM_COMPLETION_RING,
&umem->config.comp_size,
sizeof(umem->config.comp_size));
if (err) {
err = -errno;
goto out_socket;
}
err = xsk_get_mmap_offsets(umem->fd, &off);
if (err) {
err = -errno;
goto out_socket;
}
map = mmap(NULL, off.fr.desc + umem->config.fill_size * sizeof(__u64),
PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, umem->fd,
XDP_UMEM_PGOFF_FILL_RING);
if (map == MAP_FAILED) {
err = -errno;
goto out_socket;
}
umem->fill = fill;
fill->mask = umem->config.fill_size - 1;
fill->size = umem->config.fill_size;
fill->producer = map + off.fr.producer;
fill->consumer = map + off.fr.consumer;
fill->flags = map + off.fr.flags;
fill->ring = map + off.fr.desc;
fill->cached_prod = *fill->producer;
/* cached_cons is "size" bigger than the real consumer pointer
* See xsk_prod_nb_free
*/
fill->cached_cons = *fill->consumer + umem->config.fill_size;
map = mmap(NULL, off.cr.desc + umem->config.comp_size * sizeof(__u64),
PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, umem->fd,
XDP_UMEM_PGOFF_COMPLETION_RING);
if (map == MAP_FAILED) {
err = -errno;
goto out_mmap;
}
umem->comp = comp;
comp->mask = umem->config.comp_size - 1;
comp->size = umem->config.comp_size;
comp->producer = map + off.cr.producer;
comp->consumer = map + off.cr.consumer;
comp->flags = map + off.cr.flags;
comp->ring = map + off.cr.desc;
comp->cached_prod = *comp->producer;
comp->cached_cons = *comp->consumer;
umem->fill_save = fill;
umem->comp_save = comp;
*umem_ptr = umem;
return 0;
out_mmap:
munmap(map, off.fr.desc + umem->config.fill_size * sizeof(__u64));
out_socket:
close(umem->fd);
out_umem_alloc:
@ -339,6 +353,7 @@ DEFAULT_VERSION(xsk_umem__create_v0_0_4, xsk_umem__create, LIBBPF_0.0.4)
static int xsk_load_xdp_prog(struct xsk_socket *xsk)
{
static const int log_buf_size = 16 * 1024;
struct xsk_ctx *ctx = xsk->ctx;
char log_buf[log_buf_size];
int err, prog_fd;
@ -366,7 +381,7 @@ static int xsk_load_xdp_prog(struct xsk_socket *xsk)
/* *(u32 *)(r10 - 4) = r2 */
BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_2, -4),
/* r1 = xskmap[] */
BPF_LD_MAP_FD(BPF_REG_1, xsk->xsks_map_fd),
BPF_LD_MAP_FD(BPF_REG_1, ctx->xsks_map_fd),
/* r3 = XDP_PASS */
BPF_MOV64_IMM(BPF_REG_3, 2),
/* call bpf_redirect_map */
@ -378,7 +393,7 @@ static int xsk_load_xdp_prog(struct xsk_socket *xsk)
/* r2 += -4 */
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
/* r1 = xskmap[] */
BPF_LD_MAP_FD(BPF_REG_1, xsk->xsks_map_fd),
BPF_LD_MAP_FD(BPF_REG_1, ctx->xsks_map_fd),
/* call bpf_map_lookup_elem */
BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
/* r1 = r0 */
@ -390,7 +405,7 @@ static int xsk_load_xdp_prog(struct xsk_socket *xsk)
/* r2 = *(u32 *)(r10 - 4) */
BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_10, -4),
/* r1 = xskmap[] */
BPF_LD_MAP_FD(BPF_REG_1, xsk->xsks_map_fd),
BPF_LD_MAP_FD(BPF_REG_1, ctx->xsks_map_fd),
/* r3 = 0 */
BPF_MOV64_IMM(BPF_REG_3, 0),
/* call bpf_redirect_map */
@ -408,19 +423,21 @@ static int xsk_load_xdp_prog(struct xsk_socket *xsk)
return prog_fd;
}
err = bpf_set_link_xdp_fd(xsk->ifindex, prog_fd, xsk->config.xdp_flags);
err = bpf_set_link_xdp_fd(xsk->ctx->ifindex, prog_fd,
xsk->config.xdp_flags);
if (err) {
close(prog_fd);
return err;
}
xsk->prog_fd = prog_fd;
ctx->prog_fd = prog_fd;
return 0;
}
static int xsk_get_max_queues(struct xsk_socket *xsk)
{
struct ethtool_channels channels = { .cmd = ETHTOOL_GCHANNELS };
struct xsk_ctx *ctx = xsk->ctx;
struct ifreq ifr = {};
int fd, err, ret;
@ -429,7 +446,7 @@ static int xsk_get_max_queues(struct xsk_socket *xsk)
return -errno;
ifr.ifr_data = (void *)&channels;
memcpy(ifr.ifr_name, xsk->ifname, IFNAMSIZ - 1);
memcpy(ifr.ifr_name, ctx->ifname, IFNAMSIZ - 1);
ifr.ifr_name[IFNAMSIZ - 1] = '\0';
err = ioctl(fd, SIOCETHTOOL, &ifr);
if (err && errno != EOPNOTSUPP) {
@ -457,6 +474,7 @@ out:
static int xsk_create_bpf_maps(struct xsk_socket *xsk)
{
struct xsk_ctx *ctx = xsk->ctx;
int max_queues;
int fd;
@ -469,15 +487,17 @@ static int xsk_create_bpf_maps(struct xsk_socket *xsk)
if (fd < 0)
return fd;
xsk->xsks_map_fd = fd;
ctx->xsks_map_fd = fd;
return 0;
}
static void xsk_delete_bpf_maps(struct xsk_socket *xsk)
{
bpf_map_delete_elem(xsk->xsks_map_fd, &xsk->queue_id);
close(xsk->xsks_map_fd);
struct xsk_ctx *ctx = xsk->ctx;
bpf_map_delete_elem(ctx->xsks_map_fd, &ctx->queue_id);
close(ctx->xsks_map_fd);
}
static int xsk_lookup_bpf_maps(struct xsk_socket *xsk)
@ -485,10 +505,11 @@ static int xsk_lookup_bpf_maps(struct xsk_socket *xsk)
__u32 i, *map_ids, num_maps, prog_len = sizeof(struct bpf_prog_info);
__u32 map_len = sizeof(struct bpf_map_info);
struct bpf_prog_info prog_info = {};
struct xsk_ctx *ctx = xsk->ctx;
struct bpf_map_info map_info;
int fd, err;
err = bpf_obj_get_info_by_fd(xsk->prog_fd, &prog_info, &prog_len);
err = bpf_obj_get_info_by_fd(ctx->prog_fd, &prog_info, &prog_len);
if (err)
return err;
@ -502,11 +523,11 @@ static int xsk_lookup_bpf_maps(struct xsk_socket *xsk)
prog_info.nr_map_ids = num_maps;
prog_info.map_ids = (__u64)(unsigned long)map_ids;
err = bpf_obj_get_info_by_fd(xsk->prog_fd, &prog_info, &prog_len);
err = bpf_obj_get_info_by_fd(ctx->prog_fd, &prog_info, &prog_len);
if (err)
goto out_map_ids;
xsk->xsks_map_fd = -1;
ctx->xsks_map_fd = -1;
for (i = 0; i < prog_info.nr_map_ids; i++) {
fd = bpf_map_get_fd_by_id(map_ids[i]);
@ -520,7 +541,7 @@ static int xsk_lookup_bpf_maps(struct xsk_socket *xsk)
}
if (!strcmp(map_info.name, "xsks_map")) {
xsk->xsks_map_fd = fd;
ctx->xsks_map_fd = fd;
continue;
}
@ -528,7 +549,7 @@ static int xsk_lookup_bpf_maps(struct xsk_socket *xsk)
}
err = 0;
if (xsk->xsks_map_fd == -1)
if (ctx->xsks_map_fd == -1)
err = -ENOENT;
out_map_ids:
@ -538,16 +559,19 @@ out_map_ids:
static int xsk_set_bpf_maps(struct xsk_socket *xsk)
{
return bpf_map_update_elem(xsk->xsks_map_fd, &xsk->queue_id,
struct xsk_ctx *ctx = xsk->ctx;
return bpf_map_update_elem(ctx->xsks_map_fd, &ctx->queue_id,
&xsk->fd, 0);
}
static int xsk_setup_xdp_prog(struct xsk_socket *xsk)
{
struct xsk_ctx *ctx = xsk->ctx;
__u32 prog_id = 0;
int err;
err = bpf_get_link_xdp_id(xsk->ifindex, &prog_id,
err = bpf_get_link_xdp_id(ctx->ifindex, &prog_id,
xsk->config.xdp_flags);
if (err)
return err;
@ -563,12 +587,12 @@ static int xsk_setup_xdp_prog(struct xsk_socket *xsk)
return err;
}
} else {
xsk->prog_fd = bpf_prog_get_fd_by_id(prog_id);
if (xsk->prog_fd < 0)
ctx->prog_fd = bpf_prog_get_fd_by_id(prog_id);
if (ctx->prog_fd < 0)
return -errno;
err = xsk_lookup_bpf_maps(xsk);
if (err) {
close(xsk->prog_fd);
close(ctx->prog_fd);
return err;
}
}
@ -577,25 +601,110 @@ static int xsk_setup_xdp_prog(struct xsk_socket *xsk)
err = xsk_set_bpf_maps(xsk);
if (err) {
xsk_delete_bpf_maps(xsk);
close(xsk->prog_fd);
close(ctx->prog_fd);
return err;
}
return 0;
}
int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname,
__u32 queue_id, struct xsk_umem *umem,
struct xsk_ring_cons *rx, struct xsk_ring_prod *tx,
const struct xsk_socket_config *usr_config)
static struct xsk_ctx *xsk_get_ctx(struct xsk_umem *umem, int ifindex,
__u32 queue_id)
{
struct xsk_ctx *ctx;
if (list_empty(&umem->ctx_list))
return NULL;
list_for_each_entry(ctx, &umem->ctx_list, list) {
if (ctx->ifindex == ifindex && ctx->queue_id == queue_id) {
ctx->refcount++;
return ctx;
}
}
return NULL;
}
static void xsk_put_ctx(struct xsk_ctx *ctx)
{
struct xsk_umem *umem = ctx->umem;
struct xdp_mmap_offsets off;
int err;
if (--ctx->refcount == 0) {
err = xsk_get_mmap_offsets(umem->fd, &off);
if (!err) {
munmap(ctx->fill->ring - off.fr.desc,
off.fr.desc + umem->config.fill_size *
sizeof(__u64));
munmap(ctx->comp->ring - off.cr.desc,
off.cr.desc + umem->config.comp_size *
sizeof(__u64));
}
list_del(&ctx->list);
free(ctx);
}
}
static struct xsk_ctx *xsk_create_ctx(struct xsk_socket *xsk,
struct xsk_umem *umem, int ifindex,
const char *ifname, __u32 queue_id,
struct xsk_ring_prod *fill,
struct xsk_ring_cons *comp)
{
struct xsk_ctx *ctx;
int err;
ctx = calloc(1, sizeof(*ctx));
if (!ctx)
return NULL;
if (!umem->fill_save) {
err = xsk_create_umem_rings(umem, xsk->fd, fill, comp);
if (err) {
free(ctx);
return NULL;
}
} else if (umem->fill_save != fill || umem->comp_save != comp) {
/* Copy over rings to new structs. */
memcpy(fill, umem->fill_save, sizeof(*fill));
memcpy(comp, umem->comp_save, sizeof(*comp));
}
ctx->ifindex = ifindex;
ctx->refcount = 1;
ctx->umem = umem;
ctx->queue_id = queue_id;
memcpy(ctx->ifname, ifname, IFNAMSIZ - 1);
ctx->ifname[IFNAMSIZ - 1] = '\0';
umem->fill_save = NULL;
umem->comp_save = NULL;
ctx->fill = fill;
ctx->comp = comp;
list_add(&ctx->list, &umem->ctx_list);
return ctx;
}
int xsk_socket__create_shared(struct xsk_socket **xsk_ptr,
const char *ifname,
__u32 queue_id, struct xsk_umem *umem,
struct xsk_ring_cons *rx,
struct xsk_ring_prod *tx,
struct xsk_ring_prod *fill,
struct xsk_ring_cons *comp,
const struct xsk_socket_config *usr_config)
{
void *rx_map = NULL, *tx_map = NULL;
struct sockaddr_xdp sxdp = {};
struct xdp_mmap_offsets off;
struct xsk_socket *xsk;
int err;
struct xsk_ctx *ctx;
int err, ifindex;
if (!umem || !xsk_ptr || !(rx || tx))
if (!umem || !xsk_ptr || !(rx || tx) || !fill || !comp)
return -EFAULT;
xsk = calloc(1, sizeof(*xsk));
@ -606,10 +715,10 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname,
if (err)
goto out_xsk_alloc;
if (umem->refcount &&
!(xsk->config.libbpf_flags & XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD)) {
pr_warn("Error: shared umems not supported by libbpf supplied XDP program.\n");
err = -EBUSY;
xsk->outstanding_tx = 0;
ifindex = if_nametoindex(ifname);
if (!ifindex) {
err = -errno;
goto out_xsk_alloc;
}
@ -623,16 +732,16 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname,
xsk->fd = umem->fd;
}
xsk->outstanding_tx = 0;
xsk->queue_id = queue_id;
xsk->umem = umem;
xsk->ifindex = if_nametoindex(ifname);
if (!xsk->ifindex) {
err = -errno;
goto out_socket;
ctx = xsk_get_ctx(umem, ifindex, queue_id);
if (!ctx) {
ctx = xsk_create_ctx(xsk, umem, ifindex, ifname, queue_id,
fill, comp);
if (!ctx) {
err = -ENOMEM;
goto out_socket;
}
}
memcpy(xsk->ifname, ifname, IFNAMSIZ - 1);
xsk->ifname[IFNAMSIZ - 1] = '\0';
xsk->ctx = ctx;
if (rx) {
err = setsockopt(xsk->fd, SOL_XDP, XDP_RX_RING,
@ -640,7 +749,7 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname,
sizeof(xsk->config.rx_size));
if (err) {
err = -errno;
goto out_socket;
goto out_put_ctx;
}
}
if (tx) {
@ -649,14 +758,14 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname,
sizeof(xsk->config.tx_size));
if (err) {
err = -errno;
goto out_socket;
goto out_put_ctx;
}
}
err = xsk_get_mmap_offsets(xsk->fd, &off);
if (err) {
err = -errno;
goto out_socket;
goto out_put_ctx;
}
if (rx) {
@ -666,7 +775,7 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname,
xsk->fd, XDP_PGOFF_RX_RING);
if (rx_map == MAP_FAILED) {
err = -errno;
goto out_socket;
goto out_put_ctx;
}
rx->mask = xsk->config.rx_size - 1;
@ -705,10 +814,10 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname,
xsk->tx = tx;
sxdp.sxdp_family = PF_XDP;
sxdp.sxdp_ifindex = xsk->ifindex;
sxdp.sxdp_queue_id = xsk->queue_id;
sxdp.sxdp_ifindex = ctx->ifindex;
sxdp.sxdp_queue_id = ctx->queue_id;
if (umem->refcount > 1) {
sxdp.sxdp_flags = XDP_SHARED_UMEM;
sxdp.sxdp_flags |= XDP_SHARED_UMEM;
sxdp.sxdp_shared_umem_fd = umem->fd;
} else {
sxdp.sxdp_flags = xsk->config.bind_flags;
@ -720,7 +829,7 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname,
goto out_mmap_tx;
}
xsk->prog_fd = -1;
ctx->prog_fd = -1;
if (!(xsk->config.libbpf_flags & XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD)) {
err = xsk_setup_xdp_prog(xsk);
@ -739,6 +848,8 @@ out_mmap_rx:
if (rx)
munmap(rx_map, off.rx.desc +
xsk->config.rx_size * sizeof(struct xdp_desc));
out_put_ctx:
xsk_put_ctx(ctx);
out_socket:
if (--umem->refcount)
close(xsk->fd);
@ -747,25 +858,24 @@ out_xsk_alloc:
return err;
}
int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname,
__u32 queue_id, struct xsk_umem *umem,
struct xsk_ring_cons *rx, struct xsk_ring_prod *tx,
const struct xsk_socket_config *usr_config)
{
return xsk_socket__create_shared(xsk_ptr, ifname, queue_id, umem,
rx, tx, umem->fill_save,
umem->comp_save, usr_config);
}
int xsk_umem__delete(struct xsk_umem *umem)
{
struct xdp_mmap_offsets off;
int err;
if (!umem)
return 0;
if (umem->refcount)
return -EBUSY;
err = xsk_get_mmap_offsets(umem->fd, &off);
if (!err) {
munmap(umem->fill->ring - off.fr.desc,
off.fr.desc + umem->config.fill_size * sizeof(__u64));
munmap(umem->comp->ring - off.cr.desc,
off.cr.desc + umem->config.comp_size * sizeof(__u64));
}
close(umem->fd);
free(umem);
@ -775,15 +885,16 @@ int xsk_umem__delete(struct xsk_umem *umem)
void xsk_socket__delete(struct xsk_socket *xsk)
{
size_t desc_sz = sizeof(struct xdp_desc);
struct xsk_ctx *ctx = xsk->ctx;
struct xdp_mmap_offsets off;
int err;
if (!xsk)
return;
if (xsk->prog_fd != -1) {
if (ctx->prog_fd != -1) {
xsk_delete_bpf_maps(xsk);
close(xsk->prog_fd);
close(ctx->prog_fd);
}
err = xsk_get_mmap_offsets(xsk->fd, &off);
@ -796,14 +907,15 @@ void xsk_socket__delete(struct xsk_socket *xsk)
munmap(xsk->tx->ring - off.tx.desc,
off.tx.desc + xsk->config.tx_size * desc_sz);
}
}
xsk->umem->refcount--;
xsk_put_ctx(ctx);
ctx->umem->refcount--;
/* Do not close an fd that also has an associated umem connected
* to it.
*/
if (xsk->fd != xsk->umem->fd)
if (xsk->fd != ctx->umem->fd)
close(xsk->fd);
free(xsk);
}

9
tools/lib/bpf/xsk.h
View File

@ -234,6 +234,15 @@ LIBBPF_API int xsk_socket__create(struct xsk_socket **xsk,
struct xsk_ring_cons *rx,
struct xsk_ring_prod *tx,
const struct xsk_socket_config *config);
LIBBPF_API int
xsk_socket__create_shared(struct xsk_socket **xsk_ptr,
const char *ifname,
__u32 queue_id, struct xsk_umem *umem,
struct xsk_ring_cons *rx,
struct xsk_ring_prod *tx,
struct xsk_ring_prod *fill,
struct xsk_ring_cons *comp,
const struct xsk_socket_config *config);
/* Returns 0 for success and -EBUSY if the umem is still in use. */
LIBBPF_API int xsk_umem__delete(struct xsk_umem *umem);