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authorUrsula Braun <ubraun@linux.vnet.ibm.com>2017-07-28 14:56:22 +0300
committerDavid S. Miller <davem@davemloft.net>2017-07-29 21:22:58 +0300
commit10428dd8354cc1c74ee806df45c2227c1f9d7b0c (patch)
treeaeba542906415b93991296bbae5ad5f983587bcc /net/smc/smc_rx.c
parentb33982c3a6838d13024ae5a32e1f21897767b04b (diff)
downloadlinux-10428dd8354cc1c74ee806df45c2227c1f9d7b0c.tar.xz
net/smc: synchronize buffer usage with device
Usage of send buffer "sndbuf" is synced (a) before filling sndbuf for cpu access (b) after filling sndbuf for device access Usage of receive buffer "RMB" is synced (a) before reading RMB content for cpu access (b) after reading RMB content for device access Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/smc/smc_rx.c')
-rw-r--r--net/smc/smc_rx.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/smc/smc_rx.c b/net/smc/smc_rx.c
index f0c8b089f770..b17a333e9bb0 100644
--- a/net/smc/smc_rx.c
+++ b/net/smc/smc_rx.c
@@ -170,6 +170,7 @@ copy:
copylen, conn->rmbe_size - cons.count);
chunk_len_sum = chunk_len;
chunk_off = cons.count;
+ smc_rmb_sync_sg_for_cpu(conn);
for (chunk = 0; chunk < 2; chunk++) {
if (!(flags & MSG_TRUNC)) {
rc = memcpy_to_msg(msg, rcvbuf_base + chunk_off,
@@ -177,6 +178,7 @@ copy:
if (rc) {
if (!read_done)
read_done = -EFAULT;
+ smc_rmb_sync_sg_for_device(conn);
goto out;
}
}
@@ -190,6 +192,7 @@ copy:
chunk_len_sum += chunk_len;
chunk_off = 0; /* modulo offset in recv ring buffer */
}
+ smc_rmb_sync_sg_for_device(conn);
/* update cursors */
if (!(flags & MSG_PEEK)) {