[dpdk-dev] [PATCH v2] xenvirt: fix compilation after mempool changes

[Olivier Matz <olivier.matz@6wind.com>]

The field elt_va_start has been removed from the mempool structure,
and it was not replaced in xenvirt.

Fix this by getting the mempool objects address by using the address of
the first memory chunk list.

Note that it won't work with mempool composed of several chunks,
but it was already the case before.

Fixes: 84121f197187 ("mempool: store memory chunks in a list")
Reported-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
Acked-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
---

v1->v2:
- fix mempool variable name
- fix typo in Reported-by

 drivers/net/xenvirt/rte_xen_lib.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/net/xenvirt/rte_xen_lib.c b/drivers/net/xenvirt/rte_xen_lib.c
index de63cd3..6c9a1d4 100644
--- a/drivers/net/xenvirt/rte_xen_lib.c
+++ b/drivers/net/xenvirt/rte_xen_lib.c
@@ -423,6 +423,7 @@ grant_gntalloc_mbuf_pool(struct rte_mempool *mpool, uint32_t pg_num, uint32_t *g
 {
 	char key_str[PATH_MAX] = {0};
 	char val_str[PATH_MAX] = {0};
+	void *mempool_obj_va;
 
 	if (grant_node_create(pg_num, gref_arr, pa_arr, val_str, sizeof(val_str))) {
 		return -1;
@@ -437,7 +438,14 @@ grant_gntalloc_mbuf_pool(struct rte_mempool *mpool, uint32_t pg_num, uint32_t *g
 	if (snprintf(key_str, sizeof(key_str),
 		DPDK_XENSTORE_PATH"%d"MEMPOOL_VA_XENSTORE_STR, mempool_idx) == -1)
 		return -1;
-	if (snprintf(val_str, sizeof(val_str), "%"PRIxPTR, (uintptr_t)mpool->elt_va_start) == -1)
+	if (mpool->nb_mem_chunks != 1) {
+		RTE_LOG(ERR, PMD,
+			"mempool with more than 1 chunk is not supported\n");
+		return -1;
+	}
+	mempool_obj_va = STAILQ_FIRST(&mpool->mem_list)->addr;
+	if (snprintf(val_str, sizeof(val_str), "%"PRIxPTR,
+			(uintptr_t)mempool_obj_va) == -1)
 		return -1;
 	if (xenstore_write(key_str, val_str) == -1)
 		return -1;
-- 
2.8.0.rc3