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Diffstat (limited to 'net/smc/smc_rx.c')
-rw-r--r--net/smc/smc_rx.c90
1 files changed, 74 insertions, 16 deletions
diff --git a/net/smc/smc_rx.c b/net/smc/smc_rx.c
index 00ad004835e6..17c5aee7ee4f 100644
--- a/net/smc/smc_rx.c
+++ b/net/smc/smc_rx.c
@@ -145,35 +145,93 @@ static void smc_rx_spd_release(struct splice_pipe_desc *spd,
static int smc_rx_splice(struct pipe_inode_info *pipe, char *src, size_t len,
struct smc_sock *smc)
{
+ struct smc_link_group *lgr = smc->conn.lgr;
+ int offset = offset_in_page(src);
+ struct partial_page *partial;
struct splice_pipe_desc spd;
- struct partial_page partial;
- struct smc_spd_priv *priv;
- int bytes;
+ struct smc_spd_priv **priv;
+ struct page **pages;
+ int bytes, nr_pages;
+ int i;
- priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ nr_pages = !lgr->is_smcd && smc->conn.rmb_desc->is_vm ?
+ PAGE_ALIGN(len + offset) / PAGE_SIZE : 1;
+
+ pages = kcalloc(nr_pages, sizeof(*pages), GFP_KERNEL);
+ if (!pages)
+ goto out;
+ partial = kcalloc(nr_pages, sizeof(*partial), GFP_KERNEL);
+ if (!partial)
+ goto out_page;
+ priv = kcalloc(nr_pages, sizeof(*priv), GFP_KERNEL);
if (!priv)
- return -ENOMEM;
- priv->len = len;
- priv->smc = smc;
- partial.offset = src - (char *)smc->conn.rmb_desc->cpu_addr;
- partial.len = len;
- partial.private = (unsigned long)priv;
-
- spd.nr_pages_max = 1;
- spd.nr_pages = 1;
- spd.pages = &smc->conn.rmb_desc->pages;
- spd.partial = &partial;
+ goto out_part;
+ for (i = 0; i < nr_pages; i++) {
+ priv[i] = kzalloc(sizeof(**priv), GFP_KERNEL);
+ if (!priv[i])
+ goto out_priv;
+ }
+
+ if (lgr->is_smcd ||
+ (!lgr->is_smcd && !smc->conn.rmb_desc->is_vm)) {
+ /* smcd or smcr that uses physically contiguous RMBs */
+ priv[0]->len = len;
+ priv[0]->smc = smc;
+ partial[0].offset = src - (char *)smc->conn.rmb_desc->cpu_addr;
+ partial[0].len = len;
+ partial[0].private = (unsigned long)priv[0];
+ pages[0] = smc->conn.rmb_desc->pages;
+ } else {
+ int size, left = len;
+ void *buf = src;
+ /* smcr that uses virtually contiguous RMBs*/
+ for (i = 0; i < nr_pages; i++) {
+ size = min_t(int, PAGE_SIZE - offset, left);
+ priv[i]->len = size;
+ priv[i]->smc = smc;
+ pages[i] = vmalloc_to_page(buf);
+ partial[i].offset = offset;
+ partial[i].len = size;
+ partial[i].private = (unsigned long)priv[i];
+ buf += size / sizeof(*buf);
+ left -= size;
+ offset = 0;
+ }
+ }
+ spd.nr_pages_max = nr_pages;
+ spd.nr_pages = nr_pages;
+ spd.pages = pages;
+ spd.partial = partial;
spd.ops = &smc_pipe_ops;
spd.spd_release = smc_rx_spd_release;
bytes = splice_to_pipe(pipe, &spd);
if (bytes > 0) {
sock_hold(&smc->sk);
- get_page(smc->conn.rmb_desc->pages);
+ if (!lgr->is_smcd && smc->conn.rmb_desc->is_vm) {
+ for (i = 0; i < PAGE_ALIGN(bytes + offset) / PAGE_SIZE; i++)
+ get_page(pages[i]);
+ } else {
+ get_page(smc->conn.rmb_desc->pages);
+ }
atomic_add(bytes, &smc->conn.splice_pending);
}
+ kfree(priv);
+ kfree(partial);
+ kfree(pages);
return bytes;
+
+out_priv:
+ for (i = (i - 1); i >= 0; i--)
+ kfree(priv[i]);
+ kfree(priv);
+out_part:
+ kfree(partial);
+out_page:
+ kfree(pages);
+out:
+ return -ENOMEM;
}
static int smc_rx_data_available_and_no_splice_pend(struct smc_connection *conn)