diff options
Diffstat (limited to 'drivers/infiniband/sw/rdmavt/mr.c')
-rw-r--r-- | drivers/infiniband/sw/rdmavt/mr.c | 51 |
1 files changed, 44 insertions, 7 deletions
diff --git a/drivers/infiniband/sw/rdmavt/mr.c b/drivers/infiniband/sw/rdmavt/mr.c index aa5f9ea318e4..ea95672d9675 100644 --- a/drivers/infiniband/sw/rdmavt/mr.c +++ b/drivers/infiniband/sw/rdmavt/mr.c @@ -778,23 +778,54 @@ out: } /** + * rvt_sge_adjacent - is isge compressible + * @isge: outgoing internal SGE + * @last_sge: last outgoing SGE written + * @sge: SGE to check + * + * If adjacent will update last_sge to add length. + * + * Return: true if isge is adjacent to last sge + */ +static inline bool rvt_sge_adjacent(struct rvt_sge *isge, + struct rvt_sge *last_sge, + struct ib_sge *sge) +{ + if (last_sge && sge->lkey == last_sge->mr->lkey && + ((uint64_t)(last_sge->vaddr + last_sge->length) == sge->addr)) { + if (sge->lkey) { + if (unlikely((sge->addr - last_sge->mr->user_base + + sge->length > last_sge->mr->length))) + return false; /* overrun, caller will catch */ + } else { + last_sge->length += sge->length; + } + last_sge->sge_length += sge->length; + trace_rvt_sge_adjacent(last_sge, sge); + return true; + } + return false; +} + +/** * rvt_lkey_ok - check IB SGE for validity and initialize * @rkt: table containing lkey to check SGE against * @pd: protection domain * @isge: outgoing internal SGE + * @last_sge: last outgoing SGE written * @sge: SGE to check * @acc: access flags * * Check the IB SGE for validity and initialize our internal version * of it. * - * Return: 1 if valid and successful, otherwise returns 0. - * - * increments the reference count upon success + * Increments the reference count when a new sge is stored. * + * Return: 0 if compressed, 1 if added , otherwise returns -errno. */ int rvt_lkey_ok(struct rvt_lkey_table *rkt, struct rvt_pd *pd, - struct rvt_sge *isge, struct ib_sge *sge, int acc) + struct rvt_sge *isge, struct rvt_sge *last_sge, + struct ib_sge *sge, int acc) { struct rvt_mregion *mr; unsigned n, m; @@ -804,12 +835,14 @@ int rvt_lkey_ok(struct rvt_lkey_table *rkt, struct rvt_pd *pd, * We use LKEY == zero for kernel virtual addresses * (see rvt_get_dma_mr() and dma_virt_ops). */ - rcu_read_lock(); if (sge->lkey == 0) { struct rvt_dev_info *dev = ib_to_rvt(pd->ibpd.device); if (pd->user) - goto bail; + return -EINVAL; + if (rvt_sge_adjacent(isge, last_sge, sge)) + return 0; + rcu_read_lock(); mr = rcu_dereference(dev->dma_mr); if (!mr) goto bail; @@ -824,6 +857,9 @@ int rvt_lkey_ok(struct rvt_lkey_table *rkt, struct rvt_pd *pd, isge->n = 0; goto ok; } + if (rvt_sge_adjacent(isge, last_sge, sge)) + return 0; + rcu_read_lock(); mr = rcu_dereference(rkt->table[sge->lkey >> rkt->shift]); if (!mr) goto bail; @@ -874,12 +910,13 @@ int rvt_lkey_ok(struct rvt_lkey_table *rkt, struct rvt_pd *pd, isge->m = m; isge->n = n; ok: + trace_rvt_sge_new(isge, sge); return 1; bail_unref: rvt_put_mr(mr); bail: rcu_read_unlock(); - return 0; + return -EINVAL; } EXPORT_SYMBOL(rvt_lkey_ok); |