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libceph: add sparse read support to msgr1

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Add 2 new fields to ceph_connection_v1_info to track the necessary info
in sparse reads. Skip initializing the cursor for a sparse read.

Break out read_partial_message_section into a wrapper around a new
read_partial_message_chunk function that doesn't zero out the crc first.

Add new helper functions to drive receiving into the destinations
provided by the sparse_read state machine.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
Reviewed-and-tested-by: Luís Henriques <lhenriques@suse.de>
Reviewed-by: Milind Changire <mchangir@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Jeff Layton 2022-03-24 13:33:06 -04:00 committed by Ilya Dryomov
parent f36217e35c
commit d396f89db3
2 changed files with 94 additions and 8 deletions
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4
include/linux/ceph/messenger.h
View file

@ -336,6 +336,10 @@ struct ceph_connection_v1_info {
int in_base_pos; /* bytes read */
/* sparse reads */
struct kvec in_sr_kvec; /* current location to receive into */
u64 in_sr_len; /* amount of data in this extent */
/* message in temps */
u8 in_tag; /* protocol control byte */
struct ceph_msg_header in_hdr;

98
net/ceph/messenger_v1.c
View file

@ -159,9 +159,9 @@ static size_t sizeof_footer(struct ceph_connection *con)
static void prepare_message_data(struct ceph_msg *msg, u32 data_len)
{
/* Initialize data cursor */
ceph_msg_data_cursor_init(&msg->cursor, msg, data_len);
/* Initialize data cursor if it's not a sparse read */
if (!msg->sparse_read)
ceph_msg_data_cursor_init(&msg->cursor, msg, data_len);
}
/*
@ -960,9 +960,9 @@ static void process_ack(struct ceph_connection *con)
prepare_read_tag(con);
}
static int read_partial_message_section(struct ceph_connection *con,
struct kvec *section,
unsigned int sec_len, u32 *crc)
static int read_partial_message_chunk(struct ceph_connection *con,
struct kvec *section,
unsigned int sec_len, u32 *crc)
{
int ret, left;
@ -978,11 +978,91 @@ static int read_partial_message_section(struct ceph_connection *con,
section->iov_len += ret;
}
if (section->iov_len == sec_len)
*crc = crc32c(0, section->iov_base, section->iov_len);
*crc = crc32c(*crc, section->iov_base, section->iov_len);
return 1;
}
static inline int read_partial_message_section(struct ceph_connection *con,
struct kvec *section,
unsigned int sec_len, u32 *crc)
{
*crc = 0;
return read_partial_message_chunk(con, section, sec_len, crc);
}
static int read_sparse_msg_extent(struct ceph_connection *con, u32 *crc)
{
struct ceph_msg_data_cursor *cursor = &con->in_msg->cursor;
bool do_bounce = ceph_test_opt(from_msgr(con->msgr), RXBOUNCE);
if (do_bounce && unlikely(!con->bounce_page)) {
con->bounce_page = alloc_page(GFP_NOIO);
if (!con->bounce_page) {
pr_err("failed to allocate bounce page\n");
return -ENOMEM;
}
}
while (cursor->sr_resid > 0) {
struct page *page, *rpage;
size_t off, len;
int ret;
page = ceph_msg_data_next(cursor, &off, &len);
rpage = do_bounce ? con->bounce_page : page;
/* clamp to what remains in extent */
len = min_t(int, len, cursor->sr_resid);
ret = ceph_tcp_recvpage(con->sock, rpage, (int)off, len);
if (ret <= 0)
return ret;
*crc = ceph_crc32c_page(*crc, rpage, off, ret);
ceph_msg_data_advance(cursor, (size_t)ret);
cursor->sr_resid -= ret;
if (do_bounce)
memcpy_page(page, off, rpage, off, ret);
}
return 1;
}
static int read_sparse_msg_data(struct ceph_connection *con)
{
struct ceph_msg_data_cursor *cursor = &con->in_msg->cursor;
bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
u32 crc = 0;
int ret = 1;
if (do_datacrc)
crc = con->in_data_crc;
do {
if (con->v1.in_sr_kvec.iov_base)
ret = read_partial_message_chunk(con,
&con->v1.in_sr_kvec,
con->v1.in_sr_len,
&crc);
else if (cursor->sr_resid > 0)
ret = read_sparse_msg_extent(con, &crc);
if (ret <= 0) {
if (do_datacrc)
con->in_data_crc = crc;
return ret;
}
memset(&con->v1.in_sr_kvec, 0, sizeof(con->v1.in_sr_kvec));
ret = con->ops->sparse_read(con, cursor,
(char **)&con->v1.in_sr_kvec.iov_base);
con->v1.in_sr_len = ret;
} while (ret > 0);
if (do_datacrc)
con->in_data_crc = crc;
return ret < 0 ? ret : 1; /* must return > 0 to indicate success */
}
static int read_partial_msg_data(struct ceph_connection *con)
{
struct ceph_msg_data_cursor *cursor = &con->in_msg->cursor;
@ -1173,7 +1253,9 @@ static int read_partial_message(struct ceph_connection *con)
if (!m->num_data_items)
return -EIO;
if (ceph_test_opt(from_msgr(con->msgr), RXBOUNCE))
if (m->sparse_read)
ret = read_sparse_msg_data(con);
else if (ceph_test_opt(from_msgr(con->msgr), RXBOUNCE))
ret = read_partial_msg_data_bounce(con);
else
ret = read_partial_msg_data(con);