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path: root/drivers/net/ethernet/chelsio/libcxgb/libcxgb_cm.h
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Diffstat (limited to 'drivers/net/ethernet/chelsio/libcxgb/libcxgb_cm.h')
-rw-r--r--drivers/net/ethernet/chelsio/libcxgb/libcxgb_cm.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/net/ethernet/chelsio/libcxgb/libcxgb_cm.h b/drivers/net/ethernet/chelsio/libcxgb/libcxgb_cm.h
index 57fcc9899234..7fb4feb3c221 100644
--- a/drivers/net/ethernet/chelsio/libcxgb/libcxgb_cm.h
+++ b/drivers/net/ethernet/chelsio/libcxgb/libcxgb_cm.h
@@ -33,6 +33,9 @@
#ifndef __LIBCXGB_CM_H__
#define __LIBCXGB_CM_H__
+
+#include <net/tcp.h>
+
#include <cxgb4.h>
#include <t4_msg.h>
@@ -56,4 +59,19 @@ static inline bool cxgb_is_neg_adv(unsigned int status)
status == CPL_ERR_PERSIST_NEG_ADVICE ||
status == CPL_ERR_KEEPALV_NEG_ADVICE;
}
+
+static inline void
+cxgb_best_mtu(const unsigned short *mtus, unsigned short mtu,
+ unsigned int *idx, int use_ts, int ipv6)
+{
+ unsigned short hdr_size = (ipv6 ?
+ sizeof(struct ipv6hdr) :
+ sizeof(struct iphdr)) +
+ sizeof(struct tcphdr) +
+ (use_ts ?
+ round_up(TCPOLEN_TIMESTAMP, 4) : 0);
+ unsigned short data_size = mtu - hdr_size;
+
+ cxgb4_best_aligned_mtu(mtus, hdr_size, data_size, 8, idx);
+}
#endif