net/sfc: demand Tx fast free offload on EF10 simple datapath

Enforce this offload as it is immutable on the said datapath.

Fixes: c78d280e88ef ("net/sfc: convert to new Tx offload API")
Cc: stable@dpdk.org
Signed-off-by: Ivan Malov <ivan.malov@oktetlabs.ru>
Reviewed-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
Reviewed-by: Andy Moreton <amoreton@xilinx.com>

diff --git a/drivers/net/sfc/sfc_tx.c b/drivers/net/sfc/sfc_tx.c
index cd927cf2f7a5145d158f4d8e27426beeef367088..f376f24f7b887dd756b13c1fb5f6c5d970222cd6 100644 (file)
--- a/drivers/net/sfc/sfc_tx.c
+++ b/drivers/net/sfc/sfc_tx.c
@@ -308,6 +308,7 @@ sfc_tx_qinit_info(struct sfc_adapter *sa, sfc_sw_index_t sw_index)
 static int
 sfc_tx_check_mode(struct sfc_adapter *sa, const struct rte_eth_txmode *txmode)
 {
+       uint64_t dev_tx_offload_cap = sfc_tx_get_dev_offload_caps(sa);
        int rc = 0;
 
        switch (txmode->mq_mode) {
@@ -319,6 +320,13 @@ sfc_tx_check_mode(struct sfc_adapter *sa, const struct rte_eth_txmode *txmode)
                rc = EINVAL;
        }
 
+       if ((dev_tx_offload_cap & RTE_ETH_TX_OFFLOAD_MBUF_FAST_FREE) != 0 &&
+           (txmode->offloads & RTE_ETH_TX_OFFLOAD_MBUF_FAST_FREE) == 0) {
+               sfc_err(sa, "There is no FAST_FREE flag in the attempted Tx mode configuration");
+               sfc_err(sa, "FAST_FREE is always active as per the current Tx datapath variant");
+               rc = EINVAL;
+       }
+
        /*
         * These features are claimed to be i40e-specific,
         * but it does make sense to double-check their absence