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Subject[PATCH 07/14] drbd: Preallocate one page per drbd_socket as a receive buffer
Date
From: Andreas Gruenbacher <agruen@linbit.com>

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
---
drivers/block/drbd/drbd_int.h | 4 ++-
drivers/block/drbd/drbd_main.c | 22 ++++++++++++
drivers/block/drbd/drbd_receiver.c | 65 ++++++++++++++++--------------------
3 files changed, 54 insertions(+), 37 deletions(-)
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 47a435a..4a4ecec 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -554,6 +554,8 @@ struct p_delay_probe93 {
#error "PAGE_SIZE too small"
#endif

+#define DRBD_SOCKET_BUFFER_SIZE 4096
+
union p_polymorph {
struct p_header header;
struct p_handshake handshake;
@@ -803,7 +805,7 @@ struct drbd_socket {
/* this way we get our
* send/receive buffers off the stack */
union p_polymorph sbuf;
- union p_polymorph rbuf;
+ void *rbuf;
};

struct drbd_md {
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 54778e9..7b6da0e 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -2274,6 +2274,19 @@ found:
return tconn;
}

+static int drbd_alloc_socket(struct drbd_socket *socket)
+{
+ socket->rbuf = (void *) __get_free_page(GFP_KERNEL);
+ if (!socket->rbuf)
+ return -ENOMEM;
+ return 0;
+}
+
+static void drbd_free_socket(struct drbd_socket *socket)
+{
+ free_page((unsigned long) socket->rbuf);
+}
+
struct drbd_tconn *drbd_new_tconn(const char *name)
{
struct drbd_tconn *tconn;
@@ -2286,6 +2299,11 @@ struct drbd_tconn *drbd_new_tconn(const char *name)
if (!tconn->name)
goto fail;

+ if (drbd_alloc_socket(&tconn->data))
+ goto fail;
+ if (drbd_alloc_socket(&tconn->meta))
+ goto fail;
+
if (!zalloc_cpumask_var(&tconn->cpu_mask, GFP_KERNEL))
goto fail;

@@ -2324,6 +2342,8 @@ struct drbd_tconn *drbd_new_tconn(const char *name)
fail:
tl_cleanup(tconn);
free_cpumask_var(tconn->cpu_mask);
+ drbd_free_socket(&tconn->meta);
+ drbd_free_socket(&tconn->data);
kfree(tconn->name);
kfree(tconn);

@@ -2336,6 +2356,8 @@ void drbd_free_tconn(struct drbd_tconn *tconn)
idr_destroy(&tconn->volumes);

free_cpumask_var(tconn->cpu_mask);
+ drbd_free_socket(&tconn->meta);
+ drbd_free_socket(&tconn->data);
kfree(tconn->name);
kfree(tconn->int_dig_out);
kfree(tconn->int_dig_in);
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 08140d9..3738d56 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -743,7 +743,7 @@ static int drbd_send_fp(struct drbd_tconn *tconn, struct socket *sock, enum drbd

static enum drbd_packet drbd_recv_fp(struct drbd_tconn *tconn, struct socket *sock)
{
- struct p_header80 *h = &tconn->data.rbuf.header.h80;
+ struct p_header80 *h = tconn->data.rbuf;
int rr;

rr = drbd_recv_short(sock, h, sizeof(*h), 0);
@@ -997,7 +997,7 @@ static int decode_header(struct drbd_tconn *tconn, struct p_header *h, struct pa

static int drbd_recv_header(struct drbd_tconn *tconn, struct packet_info *pi)
{
- struct p_header *h = &tconn->data.rbuf.header;
+ struct p_header *h = tconn->data.rbuf;
int err;

err = drbd_recv_all_warn(tconn, h, sizeof(*h));
@@ -1239,7 +1239,7 @@ static int receive_Barrier(struct drbd_conf *mdev, enum drbd_packet cmd,
unsigned int data_size)
{
int rv;
- struct p_barrier *p = &mdev->tconn->data.rbuf.barrier;
+ struct p_barrier *p = mdev->tconn->data.rbuf;
struct drbd_epoch *epoch;

inc_unacked(mdev);
@@ -1549,7 +1549,7 @@ static int receive_DataReply(struct drbd_conf *mdev, enum drbd_packet cmd,
struct drbd_request *req;
sector_t sector;
int err;
- struct p_data *p = &mdev->tconn->data.rbuf.data;
+ struct p_data *p = mdev->tconn->data.rbuf;

sector = be64_to_cpu(p->sector);

@@ -1577,7 +1577,7 @@ static int receive_RSDataReply(struct drbd_conf *mdev, enum drbd_packet cmd,
{
sector_t sector;
int err;
- struct p_data *p = &mdev->tconn->data.rbuf.data;
+ struct p_data *p = mdev->tconn->data.rbuf;

sector = be64_to_cpu(p->sector);
D_ASSERT(p->block_id == ID_SYNCER);
@@ -1966,7 +1966,7 @@ static int receive_Data(struct drbd_conf *mdev, enum drbd_packet cmd,
{
sector_t sector;
struct drbd_peer_request *peer_req;
- struct p_data *p = &mdev->tconn->data.rbuf.data;
+ struct p_data *p = mdev->tconn->data.rbuf;
u32 peer_seq = be32_to_cpu(p->seq_num);
int rw = WRITE;
u32 dp_flags;
@@ -2150,7 +2150,7 @@ static int receive_DataRequest(struct drbd_conf *mdev, enum drbd_packet cmd,
struct digest_info *di = NULL;
int size, verb;
unsigned int fault_type;
- struct p_block_req *p = &mdev->tconn->data.rbuf.block_req;
+ struct p_block_req *p = mdev->tconn->data.rbuf;

sector = be64_to_cpu(p->sector);
size = be32_to_cpu(p->blksize);
@@ -2870,7 +2870,7 @@ static int cmp_after_sb(enum drbd_after_sb_p peer, enum drbd_after_sb_p self)
static int receive_protocol(struct drbd_tconn *tconn, enum drbd_packet cmd,
unsigned int data_size)
{
- struct p_protocol *p = &tconn->data.rbuf.protocol;
+ struct p_protocol *p = tconn->data.rbuf;
int p_proto, p_after_sb_0p, p_after_sb_1p, p_after_sb_2p;
int p_want_lose, p_two_primaries, cf;
char p_integrity_alg[SHARED_SECRET_MAX] = "";
@@ -2972,7 +2972,7 @@ struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev,
static int receive_SyncParam(struct drbd_conf *mdev, enum drbd_packet cmd,
unsigned int packet_size)
{
- struct p_rs_param_95 *p = &mdev->tconn->data.rbuf.rs_param_95;
+ struct p_rs_param_95 *p = mdev->tconn->data.rbuf;
unsigned int header_size, data_size, exp_max_sz;
struct crypto_hash *verify_tfm = NULL;
struct crypto_hash *csums_tfm = NULL;
@@ -3139,7 +3139,7 @@ static void warn_if_differ_considerably(struct drbd_conf *mdev,
static int receive_sizes(struct drbd_conf *mdev, enum drbd_packet cmd,
unsigned int data_size)
{
- struct p_sizes *p = &mdev->tconn->data.rbuf.sizes;
+ struct p_sizes *p = mdev->tconn->data.rbuf;
enum determine_dev_size dd = unchanged;
sector_t p_size, p_usize, my_usize;
int ldsc = 0; /* local disk size changed */
@@ -3237,7 +3237,7 @@ static int receive_sizes(struct drbd_conf *mdev, enum drbd_packet cmd,
static int receive_uuids(struct drbd_conf *mdev, enum drbd_packet cmd,
unsigned int data_size)
{
- struct p_uuids *p = &mdev->tconn->data.rbuf.uuids;
+ struct p_uuids *p = mdev->tconn->data.rbuf;
u64 *p_uuid;
int i, updated_uuids = 0;

@@ -3333,7 +3333,7 @@ static union drbd_state convert_state(union drbd_state ps)
static int receive_req_state(struct drbd_conf *mdev, enum drbd_packet cmd,
unsigned int data_size)
{
- struct p_req_state *p = &mdev->tconn->data.rbuf.req_state;
+ struct p_req_state *p = mdev->tconn->data.rbuf;
union drbd_state mask, val;
enum drbd_state_rv rv;

@@ -3360,7 +3360,7 @@ static int receive_req_state(struct drbd_conf *mdev, enum drbd_packet cmd,
static int receive_req_conn_state(struct drbd_tconn *tconn, enum drbd_packet cmd,
unsigned int data_size)
{
- struct p_req_state *p = &tconn->data.rbuf.req_state;
+ struct p_req_state *p = tconn->data.rbuf;
union drbd_state mask, val;
enum drbd_state_rv rv;

@@ -3385,7 +3385,7 @@ static int receive_req_conn_state(struct drbd_tconn *tconn, enum drbd_packet cmd
static int receive_state(struct drbd_conf *mdev, enum drbd_packet cmd,
unsigned int data_size)
{
- struct p_state *p = &mdev->tconn->data.rbuf.state;
+ struct p_state *p = mdev->tconn->data.rbuf;
union drbd_state os, ns, peer_state;
enum drbd_disk_state real_peer_disk;
enum chg_state_flags cs_flags;
@@ -3538,7 +3538,7 @@ static int receive_state(struct drbd_conf *mdev, enum drbd_packet cmd,
static int receive_sync_uuid(struct drbd_conf *mdev, enum drbd_packet cmd,
unsigned int data_size)
{
- struct p_rs_uuid *p = &mdev->tconn->data.rbuf.rs_uuid;
+ struct p_rs_uuid *p = mdev->tconn->data.rbuf;

wait_event(mdev->misc_wait,
mdev->state.conn == C_WF_SYNC_UUID ||
@@ -3750,7 +3750,7 @@ static int receive_bitmap(struct drbd_conf *mdev, enum drbd_packet cmd,
struct bm_xfer_ctx c;
void *buffer;
int err;
- struct p_header *h = &mdev->tconn->data.rbuf.header;
+ struct p_header *h = mdev->tconn->data.rbuf;
struct packet_info pi;

drbd_bm_lock(mdev, "receive bitmap", BM_LOCKED_SET_ALLOWED);
@@ -3891,7 +3891,7 @@ static int receive_UnplugRemote(struct drbd_conf *mdev, enum drbd_packet cmd,
static int receive_out_of_sync(struct drbd_conf *mdev, enum drbd_packet cmd,
unsigned int data_size)
{
- struct p_block_desc *p = &mdev->tconn->data.rbuf.block_desc;
+ struct p_block_desc *p = mdev->tconn->data.rbuf;

switch (mdev->state.conn) {
case C_WF_SYNC_UUID:
@@ -3946,16 +3946,9 @@ static struct data_cmd drbd_cmd_handler[] = {
[P_CONN_ST_CHG_REQ] = { 0, sizeof(struct p_req_state), CONN, { .conn_fn = receive_req_conn_state } },
};

-/* All handler functions that expect a sub-header get that sub-heder in
- mdev->tconn->data.rbuf.header.head.payload.
-
- Usually in mdev->tconn->data.rbuf.header.head the callback can find the usual
- p_header, but they may not rely on that. Since there is also p_header95 !
- */
-
static void drbdd(struct drbd_tconn *tconn)
{
- struct p_header *header = &tconn->data.rbuf.header;
+ struct p_header *header = tconn->data.rbuf;
struct packet_info pi;
size_t shs; /* sub header size */
int err;
@@ -4186,7 +4179,7 @@ static int drbd_send_handshake(struct drbd_tconn *tconn)
static int drbd_do_handshake(struct drbd_tconn *tconn)
{
/* ASSERT current == tconn->receiver ... */
- struct p_handshake *p = &tconn->data.rbuf.handshake;
+ struct p_handshake *p = tconn->data.rbuf;
const int expect = sizeof(struct p_handshake) - sizeof(struct p_header80);
struct packet_info pi;
int err;
@@ -4433,7 +4426,7 @@ int drbdd_init(struct drbd_thread *thi)

static int got_conn_RqSReply(struct drbd_tconn *tconn, enum drbd_packet cmd)
{
- struct p_req_state_reply *p = &tconn->meta.rbuf.req_state_reply;
+ struct p_req_state_reply *p = tconn->meta.rbuf;
int retcode = be32_to_cpu(p->retcode);

if (retcode >= SS_SUCCESS) {
@@ -4450,7 +4443,7 @@ static int got_conn_RqSReply(struct drbd_tconn *tconn, enum drbd_packet cmd)

static int got_RqSReply(struct drbd_conf *mdev, enum drbd_packet cmd)
{
- struct p_req_state_reply *p = &mdev->tconn->meta.rbuf.req_state_reply;
+ struct p_req_state_reply *p = mdev->tconn->meta.rbuf;
int retcode = be32_to_cpu(p->retcode);

if (retcode >= SS_SUCCESS) {
@@ -4483,7 +4476,7 @@ static int got_PingAck(struct drbd_tconn *tconn, enum drbd_packet cmd)

static int got_IsInSync(struct drbd_conf *mdev, enum drbd_packet cmd)
{
- struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack;
+ struct p_block_ack *p = mdev->tconn->meta.rbuf;
sector_t sector = be64_to_cpu(p->sector);
int blksize = be32_to_cpu(p->blksize);

@@ -4528,7 +4521,7 @@ validate_req_change_req_state(struct drbd_conf *mdev, u64 id, sector_t sector,

static int got_BlockAck(struct drbd_conf *mdev, enum drbd_packet cmd)
{
- struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack;
+ struct p_block_ack *p = mdev->tconn->meta.rbuf;
sector_t sector = be64_to_cpu(p->sector);
int blksize = be32_to_cpu(p->blksize);
enum drbd_req_event what;
@@ -4573,7 +4566,7 @@ static int got_BlockAck(struct drbd_conf *mdev, enum drbd_packet cmd)

static int got_NegAck(struct drbd_conf *mdev, enum drbd_packet cmd)
{
- struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack;
+ struct p_block_ack *p = mdev->tconn->meta.rbuf;
sector_t sector = be64_to_cpu(p->sector);
int size = be32_to_cpu(p->blksize);
bool missing_ok = mdev->tconn->net_conf->wire_protocol == DRBD_PROT_A ||
@@ -4606,7 +4599,7 @@ static int got_NegAck(struct drbd_conf *mdev, enum drbd_packet cmd)

static int got_NegDReply(struct drbd_conf *mdev, enum drbd_packet cmd)
{
- struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack;
+ struct p_block_ack *p = mdev->tconn->meta.rbuf;
sector_t sector = be64_to_cpu(p->sector);

update_peer_seq(mdev, be32_to_cpu(p->seq_num));
@@ -4623,7 +4616,7 @@ static int got_NegRSDReply(struct drbd_conf *mdev, enum drbd_packet cmd)
{
sector_t sector;
int size;
- struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack;
+ struct p_block_ack *p = mdev->tconn->meta.rbuf;

sector = be64_to_cpu(p->sector);
size = be32_to_cpu(p->blksize);
@@ -4652,7 +4645,7 @@ static int got_NegRSDReply(struct drbd_conf *mdev, enum drbd_packet cmd)

static int got_BarrierAck(struct drbd_conf *mdev, enum drbd_packet cmd)
{
- struct p_barrier_ack *p = &mdev->tconn->meta.rbuf.barrier_ack;
+ struct p_barrier_ack *p = mdev->tconn->meta.rbuf;

tl_release(mdev->tconn, p->barrier, be32_to_cpu(p->set_size));

@@ -4668,7 +4661,7 @@ static int got_BarrierAck(struct drbd_conf *mdev, enum drbd_packet cmd)

static int got_OVResult(struct drbd_conf *mdev, enum drbd_packet cmd)
{
- struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack;
+ struct p_block_ack *p = mdev->tconn->meta.rbuf;
struct drbd_work *w;
sector_t sector;
int size;
@@ -4774,7 +4767,7 @@ static struct asender_cmd asender_tbl[] = {
int drbd_asender(struct drbd_thread *thi)
{
struct drbd_tconn *tconn = thi->tconn;
- struct p_header *h = &tconn->meta.rbuf.header;
+ struct p_header *h = tconn->meta.rbuf;
struct asender_cmd *cmd = NULL;
struct packet_info pi;
int rv;
--
1.7.4.1


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