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Merge branch 'net-rds-RDMA-fixes'

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Gerd Rausch says:

====================
net/rds: RDMA fixes

A number of net/rds fixes necessary to make "rds_rdma.ko"
pass some basic Oracle internal tests.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2019-07-17 12:06:52 -07:00
commit 4809bba728
5 changed files with 108 additions and 48 deletions
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1
net/rds/ib.h
View File

@ -156,6 +156,7 @@ struct rds_ib_connection {
/* To control the number of wrs from fastreg */
atomic_t i_fastreg_wrs;
atomic_t i_fastreg_inuse_count;
/* interrupt handling */
struct tasklet_struct i_send_tasklet;

9
net/rds/ib_cm.c
View File

@ -40,6 +40,7 @@
#include "rds_single_path.h"
#include "rds.h"
#include "ib.h"
#include "ib_mr.h"
/*
* Set the selected protocol version
@ -526,7 +527,6 @@ static int rds_ib_setup_qp(struct rds_connection *conn)
attr.qp_type = IB_QPT_RC;
attr.send_cq = ic->i_send_cq;
attr.recv_cq = ic->i_recv_cq;
atomic_set(&ic->i_fastreg_wrs, RDS_IB_DEFAULT_FR_WR);
/*
* XXX this can fail if max_*_wr is too large? Are we supposed
@ -993,6 +993,11 @@ void rds_ib_conn_path_shutdown(struct rds_conn_path *cp)
ic->i_cm_id, err);
}
/* kick off "flush_worker" for all pools in order to reap
* all FRMR registrations that are still marked "FRMR_IS_INUSE"
*/
rds_ib_flush_mrs();
/*
* We want to wait for tx and rx completion to finish
* before we tear down the connection, but we have to be
@ -1005,6 +1010,7 @@ void rds_ib_conn_path_shutdown(struct rds_conn_path *cp)
wait_event(rds_ib_ring_empty_wait,
rds_ib_ring_empty(&ic->i_recv_ring) &&
(atomic_read(&ic->i_signaled_sends) == 0) &&
(atomic_read(&ic->i_fastreg_inuse_count) == 0) &&
(atomic_read(&ic->i_fastreg_wrs) == RDS_IB_DEFAULT_FR_WR));
tasklet_kill(&ic->i_send_tasklet);
tasklet_kill(&ic->i_recv_tasklet);
@ -1132,6 +1138,7 @@ int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp)
spin_lock_init(&ic->i_ack_lock);
#endif
atomic_set(&ic->i_signaled_sends, 0);
atomic_set(&ic->i_fastreg_wrs, RDS_IB_DEFAULT_FR_WR);
/*
* rds_ib_conn_shutdown() waits for these to be emptied so they

84
net/rds/ib_frmr.c
View File

@ -32,6 +32,24 @@
#include "ib_mr.h"
static inline void
rds_transition_frwr_state(struct rds_ib_mr *ibmr,
enum rds_ib_fr_state old_state,
enum rds_ib_fr_state new_state)
{
if (cmpxchg(&ibmr->u.frmr.fr_state,
old_state, new_state) == old_state &&
old_state == FRMR_IS_INUSE) {
/* enforce order of ibmr->u.frmr.fr_state update
* before decrementing i_fastreg_inuse_count
*/
smp_mb__before_atomic();
atomic_dec(&ibmr->ic->i_fastreg_inuse_count);
if (waitqueue_active(&rds_ib_ring_empty_wait))
wake_up(&rds_ib_ring_empty_wait);
}
}
static struct rds_ib_mr *rds_ib_alloc_frmr(struct rds_ib_device *rds_ibdev,
int npages)
{
@ -75,6 +93,8 @@ static struct rds_ib_mr *rds_ib_alloc_frmr(struct rds_ib_device *rds_ibdev,
pool->max_items_soft = pool->max_items;
frmr->fr_state = FRMR_IS_FREE;
init_waitqueue_head(&frmr->fr_inv_done);
init_waitqueue_head(&frmr->fr_reg_done);
return ibmr;
out_no_cigar:
@ -116,13 +136,19 @@ static int rds_ib_post_reg_frmr(struct rds_ib_mr *ibmr)
if (unlikely(ret != ibmr->sg_len))
return ret < 0 ? ret : -EINVAL;
if (cmpxchg(&frmr->fr_state,
FRMR_IS_FREE, FRMR_IS_INUSE) != FRMR_IS_FREE)
return -EBUSY;
atomic_inc(&ibmr->ic->i_fastreg_inuse_count);
/* Perform a WR for the fast_reg_mr. Each individual page
* in the sg list is added to the fast reg page list and placed
* inside the fast_reg_mr WR. The key used is a rolling 8bit
* counter, which should guarantee uniqueness.
*/
ib_update_fast_reg_key(frmr->mr, ibmr->remap_count++);
frmr->fr_state = FRMR_IS_INUSE;
frmr->fr_reg = true;
memset(&reg_wr, 0, sizeof(reg_wr));
reg_wr.wr.wr_id = (unsigned long)(void *)ibmr;
@ -138,12 +164,23 @@ static int rds_ib_post_reg_frmr(struct rds_ib_mr *ibmr)
ret = ib_post_send(ibmr->ic->i_cm_id->qp, &reg_wr.wr, NULL);
if (unlikely(ret)) {
/* Failure here can be because of -ENOMEM as well */
frmr->fr_state = FRMR_IS_STALE;
rds_transition_frwr_state(ibmr, FRMR_IS_INUSE, FRMR_IS_STALE);
atomic_inc(&ibmr->ic->i_fastreg_wrs);
if (printk_ratelimit())
pr_warn("RDS/IB: %s returned error(%d)\n",
__func__, ret);
goto out;
}
/* Wait for the registration to complete in order to prevent an invalid
* access error resulting from a race between the memory region already
* being accessed while registration is still pending.
*/
wait_event(frmr->fr_reg_done, !frmr->fr_reg);
out:
return ret;
}
@ -255,12 +292,29 @@ static int rds_ib_post_inv(struct rds_ib_mr *ibmr)
ret = ib_post_send(i_cm_id->qp, s_wr, NULL);
if (unlikely(ret)) {
frmr->fr_state = FRMR_IS_STALE;
rds_transition_frwr_state(ibmr, FRMR_IS_INUSE, FRMR_IS_STALE);
frmr->fr_inv = false;
/* enforce order of frmr->fr_inv update
* before incrementing i_fastreg_wrs
*/
smp_mb__before_atomic();
atomic_inc(&ibmr->ic->i_fastreg_wrs);
pr_err("RDS/IB: %s returned error(%d)\n", __func__, ret);
goto out;
}
/* Wait for the FRMR_IS_FREE (or FRMR_IS_STALE) transition in order to
* 1) avoid a silly bouncing between "clean_list" and "drop_list"
* triggered by function "rds_ib_reg_frmr" as it is releases frmr
* regions whose state is not "FRMR_IS_FREE" right away.
* 2) prevents an invalid access error in a race
* from a pending "IB_WR_LOCAL_INV" operation
* with a teardown ("dma_unmap_sg", "put_page")
* and de-registration ("ib_dereg_mr") of the corresponding
* memory region.
*/
wait_event(frmr->fr_inv_done, frmr->fr_state != FRMR_IS_INUSE);
out:
return ret;
}
@ -271,7 +325,7 @@ void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc)
struct rds_ib_frmr *frmr = &ibmr->u.frmr;
if (wc->status != IB_WC_SUCCESS) {
frmr->fr_state = FRMR_IS_STALE;
rds_transition_frwr_state(ibmr, FRMR_IS_INUSE, FRMR_IS_STALE);
if (rds_conn_up(ic->conn))
rds_ib_conn_error(ic->conn,
"frmr completion <%pI4,%pI4> status %u(%s), vendor_err 0x%x, disconnecting and reconnecting\n",
@ -283,10 +337,20 @@ void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc)
}
if (frmr->fr_inv) {
frmr->fr_state = FRMR_IS_FREE;
rds_transition_frwr_state(ibmr, FRMR_IS_INUSE, FRMR_IS_FREE);
frmr->fr_inv = false;
wake_up(&frmr->fr_inv_done);
}
if (frmr->fr_reg) {
frmr->fr_reg = false;
wake_up(&frmr->fr_reg_done);
}
/* enforce order of frmr->{fr_reg,fr_inv} update
* before incrementing i_fastreg_wrs
*/
smp_mb__before_atomic();
atomic_inc(&ic->i_fastreg_wrs);
}
@ -295,14 +359,18 @@ void rds_ib_unreg_frmr(struct list_head *list, unsigned int *nfreed,
{
struct rds_ib_mr *ibmr, *next;
struct rds_ib_frmr *frmr;
int ret = 0;
int ret = 0, ret2;
unsigned int freed = *nfreed;
/* String all ib_mr's onto one list and hand them to ib_unmap_fmr */
list_for_each_entry(ibmr, list, unmap_list) {
if (ibmr->sg_dma_len)
ret |= rds_ib_post_inv(ibmr);
if (ibmr->sg_dma_len) {
ret2 = rds_ib_post_inv(ibmr);
if (ret2 && !ret)
ret = ret2;
}
}
if (ret)
pr_warn("RDS/IB: %s failed (err=%d)\n", __func__, ret);

4
net/rds/ib_mr.h
View File

@ -57,6 +57,9 @@ struct rds_ib_frmr {
struct ib_mr *mr;
enum rds_ib_fr_state fr_state;
bool fr_inv;
wait_queue_head_t fr_inv_done;
bool fr_reg;
wait_queue_head_t fr_reg_done;
struct ib_send_wr fr_wr;
unsigned int dma_npages;
unsigned int sg_byte_len;
@ -97,6 +100,7 @@ struct rds_ib_mr_pool {
struct llist_head free_list; /* unused MRs */
struct llist_head clean_list; /* unused & unmapped MRs */
wait_queue_head_t flush_wait;
spinlock_t clean_lock; /* "clean_list" concurrency */
atomic_t free_pinned; /* memory pinned by free MRs */
unsigned long max_items;

58
net/rds/ib_rdma.c
View File

@ -40,9 +40,6 @@
struct workqueue_struct *rds_ib_mr_wq;
static DEFINE_PER_CPU(unsigned long, clean_list_grace);
#define CLEAN_LIST_BUSY_BIT 0
static struct rds_ib_device *rds_ib_get_device(__be32 ipaddr)
{
struct rds_ib_device *rds_ibdev;
@ -195,12 +192,11 @@ struct rds_ib_mr *rds_ib_reuse_mr(struct rds_ib_mr_pool *pool)
{
struct rds_ib_mr *ibmr = NULL;
struct llist_node *ret;
unsigned long *flag;
unsigned long flags;
preempt_disable();
flag = this_cpu_ptr(&clean_list_grace);
set_bit(CLEAN_LIST_BUSY_BIT, flag);
spin_lock_irqsave(&pool->clean_lock, flags);
ret = llist_del_first(&pool->clean_list);
spin_unlock_irqrestore(&pool->clean_lock, flags);
if (ret) {
ibmr = llist_entry(ret, struct rds_ib_mr, llnode);
if (pool->pool_type == RDS_IB_MR_8K_POOL)
@ -209,23 +205,9 @@ struct rds_ib_mr *rds_ib_reuse_mr(struct rds_ib_mr_pool *pool)
rds_ib_stats_inc(s_ib_rdma_mr_1m_reused);
}
clear_bit(CLEAN_LIST_BUSY_BIT, flag);
preempt_enable();
return ibmr;
}
static inline void wait_clean_list_grace(void)
{
int cpu;
unsigned long *flag;
for_each_online_cpu(cpu) {
flag = &per_cpu(clean_list_grace, cpu);
while (test_bit(CLEAN_LIST_BUSY_BIT, flag))
cpu_relax();
}
}
void rds_ib_sync_mr(void *trans_private, int direction)
{
struct rds_ib_mr *ibmr = trans_private;
@ -324,8 +306,7 @@ static unsigned int llist_append_to_list(struct llist_head *llist,
* of clusters. Each cluster has linked llist nodes of
* MR_CLUSTER_SIZE mrs that are ready for reuse.
*/
static void list_to_llist_nodes(struct rds_ib_mr_pool *pool,
struct list_head *list,
static void list_to_llist_nodes(struct list_head *list,
struct llist_node **nodes_head,
struct llist_node **nodes_tail)
{
@ -402,8 +383,13 @@ int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *pool,
*/
dirty_to_clean = llist_append_to_list(&pool->drop_list, &unmap_list);
dirty_to_clean += llist_append_to_list(&pool->free_list, &unmap_list);
if (free_all)
if (free_all) {
unsigned long flags;
spin_lock_irqsave(&pool->clean_lock, flags);
llist_append_to_list(&pool->clean_list, &unmap_list);
spin_unlock_irqrestore(&pool->clean_lock, flags);
}
free_goal = rds_ib_flush_goal(pool, free_all);
@ -416,27 +402,20 @@ int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *pool,
rds_ib_unreg_fmr(&unmap_list, &nfreed, &unpinned, free_goal);
if (!list_empty(&unmap_list)) {
/* we have to make sure that none of the things we're about
* to put on the clean list would race with other cpus trying
* to pull items off. The llist would explode if we managed to
* remove something from the clean list and then add it back again
* while another CPU was spinning on that same item in llist_del_first.
*
* This is pretty unlikely, but just in case wait for an llist grace period
* here before adding anything back into the clean list.
*/
wait_clean_list_grace();
unsigned long flags;
list_to_llist_nodes(pool, &unmap_list, &clean_nodes, &clean_tail);
list_to_llist_nodes(&unmap_list, &clean_nodes, &clean_tail);
if (ibmr_ret) {
*ibmr_ret = llist_entry(clean_nodes, struct rds_ib_mr, llnode);
clean_nodes = clean_nodes->next;
}
/* more than one entry in llist nodes */
if (clean_nodes)
if (clean_nodes) {
spin_lock_irqsave(&pool->clean_lock, flags);
llist_add_batch(clean_nodes, clean_tail,
&pool->clean_list);
spin_unlock_irqrestore(&pool->clean_lock, flags);
}
}
atomic_sub(unpinned, &pool->free_pinned);
@ -471,7 +450,7 @@ struct rds_ib_mr *rds_ib_try_reuse_ibmr(struct rds_ib_mr_pool *pool)
rds_ib_stats_inc(s_ib_rdma_mr_8k_pool_depleted);
else
rds_ib_stats_inc(s_ib_rdma_mr_1m_pool_depleted);
return ERR_PTR(-EAGAIN);
break;
}
/* We do have some empty MRs. Flush them out. */
@ -485,7 +464,7 @@ struct rds_ib_mr *rds_ib_try_reuse_ibmr(struct rds_ib_mr_pool *pool)
return ibmr;
}
return ibmr;
return NULL;
}
static void rds_ib_mr_pool_flush_worker(struct work_struct *work)
@ -610,6 +589,7 @@ struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *rds_ibdev,
init_llist_head(&pool->free_list);
init_llist_head(&pool->drop_list);
init_llist_head(&pool->clean_list);
spin_lock_init(&pool->clean_lock);
mutex_init(&pool->flush_lock);
init_waitqueue_head(&pool->flush_wait);
INIT_DELAYED_WORK(&pool->flush_worker, rds_ib_mr_pool_flush_worker);