提交 09c6954e 编写于 作者: K Kaike Wan 提交者: Greg Kroah-Hartman

IB/hfi1: Fix the allocation of RSM table

[ Upstream commit d0294344470e6b52d097aa7369173f32d11f2f52 ]

The receive side mapping (RSM) on hfi1 hardware is a special
matching mechanism to direct an incoming packet to a given
hardware receive context. It has 4 instances of matching capabilities
(RSM0 - RSM3) that share the same RSM table (RMT). The RMT has a total of
256 entries, each of which points to a receive context.

Currently, three instances of RSM have been used:
1. RSM0 by QOS;
2. RSM1 by PSM FECN;
3. RSM2 by VNIC.

Each RSM instance should reserve enough entries in RMT to function
properly. Since both PSM and VNIC could allocate any receive context
between dd->first_dyn_alloc_ctxt and dd->num_rcv_contexts, PSM FECN must
reserve enough RMT entries to cover the entire receive context index
range (dd->num_rcv_contexts - dd->first_dyn_alloc_ctxt) instead of only
the user receive contexts allocated for PSM
(dd->num_user_contexts). Consequently, the sizing of
dd->num_user_contexts in set_up_context_variables is incorrect.

Fixes: 2280740f ("IB/hfi1: Virtual Network Interface Controller (VNIC) HW support")
Reviewed-by: NMike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: NMichael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: NKaike Wan <kaike.wan@intel.com>
Signed-off-by: NDennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: NJason Gunthorpe <jgg@mellanox.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
上级 3abd4aef
......@@ -13388,7 +13388,7 @@ static int set_up_context_variables(struct hfi1_devdata *dd)
int total_contexts;
int ret;
unsigned ngroups;
int qos_rmt_count;
int rmt_count;
int user_rmt_reduced;
u32 n_usr_ctxts;
u32 send_contexts = chip_send_contexts(dd);
......@@ -13450,10 +13450,20 @@ static int set_up_context_variables(struct hfi1_devdata *dd)
n_usr_ctxts = rcv_contexts - total_contexts;
}
/* each user context requires an entry in the RMT */
qos_rmt_count = qos_rmt_entries(dd, NULL, NULL);
if (qos_rmt_count + n_usr_ctxts > NUM_MAP_ENTRIES) {
user_rmt_reduced = NUM_MAP_ENTRIES - qos_rmt_count;
/*
* The RMT entries are currently allocated as shown below:
* 1. QOS (0 to 128 entries);
* 2. FECN for PSM (num_user_contexts + num_vnic_contexts);
* 3. VNIC (num_vnic_contexts).
* It should be noted that PSM FECN oversubscribe num_vnic_contexts
* entries of RMT because both VNIC and PSM could allocate any receive
* context between dd->first_dyn_alloc_text and dd->num_rcv_contexts,
* and PSM FECN must reserve an RMT entry for each possible PSM receive
* context.
*/
rmt_count = qos_rmt_entries(dd, NULL, NULL) + (num_vnic_contexts * 2);
if (rmt_count + n_usr_ctxts > NUM_MAP_ENTRIES) {
user_rmt_reduced = NUM_MAP_ENTRIES - rmt_count;
dd_dev_err(dd,
"RMT size is reducing the number of user receive contexts from %u to %d\n",
n_usr_ctxts,
......@@ -14441,9 +14451,11 @@ static void init_user_fecn_handling(struct hfi1_devdata *dd,
u64 reg;
int i, idx, regoff, regidx;
u8 offset;
u32 total_cnt;
/* there needs to be enough room in the map table */
if (rmt->used + dd->num_user_contexts >= NUM_MAP_ENTRIES) {
total_cnt = dd->num_rcv_contexts - dd->first_dyn_alloc_ctxt;
if (rmt->used + total_cnt >= NUM_MAP_ENTRIES) {
dd_dev_err(dd, "User FECN handling disabled - too many user contexts allocated\n");
return;
}
......@@ -14497,7 +14509,7 @@ static void init_user_fecn_handling(struct hfi1_devdata *dd,
/* add rule 1 */
add_rsm_rule(dd, RSM_INS_FECN, &rrd);
rmt->used += dd->num_user_contexts;
rmt->used += total_cnt;
}
/* Initialize RSM for VNIC */
......
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