RDS: Use page_remainder_alloc() for recv bufs
Instead of splitting up a page into RDS_FRAG_SIZE chunks
ourselves, ask rds_page_remainder_alloc() to do it. While it
is possible PAGE_SIZE > FRAG_SIZE, on x86en it isn't, so having
duplicate "carve up a page into buffers" code seems excessive.
The other modification this spawns is the use of a single
struct scatterlist in rds_page_frag instead of a bare page ptr.
This causes verbosity to increase in some places, and decrease
in others.
Finally, I decided to unify the lifetimes and alloc/free of
rds_page_frag and its page. This is a nice simplification in itself,
but will be extra-nice once we come to adding cmason's recycling
patch.
Signed-off-by: Andy Grover <andy.grover@oracle.com>
diff --git a/net/rds/ib.h b/net/rds/ib.h
index 282ec69..9bb7a74 100644
--- a/net/rds/ib.h
+++ b/net/rds/ib.h
@@ -28,13 +28,9 @@
* try and minimize the amount of memory tied up both the device and
* socket receive queues.
*/
-/* page offset of the final full frag that fits in the page */
-#define RDS_PAGE_LAST_OFF (((PAGE_SIZE / RDS_FRAG_SIZE) - 1) * RDS_FRAG_SIZE)
struct rds_page_frag {
struct list_head f_item;
- struct page *f_page;
- unsigned long f_offset;
- dma_addr_t f_mapped;
+ struct scatterlist f_sg;
};
struct rds_ib_incoming {
@@ -107,7 +103,6 @@
struct rds_header *i_recv_hdrs;
u64 i_recv_hdrs_dma;
struct rds_ib_recv_work *i_recvs;
- struct rds_page_frag i_frag;
u64 i_ack_recv; /* last ACK received */
/* sending acks */