Author: jhb
Date: Wed Jan 24 20:13:07 2018
New Revision: 328358
URL: https://svnweb.freebsd.org/changeset/base/328358
Log:
Clamp DSGL entries to a length of 2KB.
This works around an issue in the T6 that can result in DMA engine
stalls if an error occurs while processing a DSGL entry with a length
larger than 2KB.
Submitted by: Harsh Jain @ Chelsio
Sponsored by: Chelsio Communications
Modified:
head/sys/dev/cxgbe/crypto/t4_crypto.c
Modified: head/sys/dev/cxgbe/crypto/t4_crypto.c
==============================================================================
--- head/sys/dev/cxgbe/crypto/t4_crypto.c Wed Jan 24 20:12:00 2018
(r328357)
+++ head/sys/dev/cxgbe/crypto/t4_crypto.c Wed Jan 24 20:13:07 2018
(r328358)
@@ -116,11 +116,13 @@ __FBSDID("$FreeBSD$");
#define MAX_AAD_LEN 511
/*
- * The documentation for CPL_RX_PHYS_DSGL claims a maximum of 32
- * SG entries.
+ * The documentation for CPL_RX_PHYS_DSGL claims a maximum of 32 SG
+ * entries. While the CPL includes a 16-bit length field, the T6 can
+ * sometimes hang if an error occurs while processing a request with a
+ * single DSGL entry larger than 2k.
*/
#define MAX_RX_PHYS_DSGL_SGE 32
-#define DSGL_SGE_MAXLEN 65535
+#define DSGL_SGE_MAXLEN 2048
/*
* The adapter only supports requests with a total input or output
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