On Wed, 2015-08-19 at 15:59 +0300, Emmanuel Grumbach wrote:

The segmentation is done completely in software. The
driver creates several MPDUs out of a single large send.
Each MPDU is a newly allocated SKB.
A page is allocated to create the headers that need to be
duplicated (SNAP / IP / TCP). The WiFi header is in the
header of the newly created SKBs.

type=feature

Change-Id: I238ffa79cacc5bbdacdfbf3e9673c8d4f02b462a
Signed-off-by: Emmanuel Grumbach <redacted>
---
 drivers/net/wireless/iwlwifi/mvm/tx.c | 513 +++++++++++++++++++++++++++++++---
 1 file changed, 481 insertions(+), 32 deletions(-)

Ouch dynamic allocations while doing xmit are certainly not needed.
Your driver should pre-allocated space for headers.

Drivers willing to implement tso have to use net/core/tso.c provided
helpers.

$ git grep -n tso_build_hdr
drivers/net/ethernet/cavium/thunder/nicvf_queues.c:1030:                tso_build_hdr(skb, hdr, &tso, data_left, total_len == 0);
drivers/net/ethernet/freescale/fec_main.c:729:          tso_build_hdr(skb, hdr, &tso, data_left, total_len == 0);
drivers/net/ethernet/marvell/mv643xx_eth.c:842:         tso_build_hdr(skb, hdr, &tso, data_left, total_len == 0);
drivers/net/ethernet/marvell/mvneta.c:1650:             tso_build_hdr(skb, hdr, &tso, data_left, total_len == 0);
include/net/tso.h:15:void tso_build_hdr(struct sk_buff *skb, char *hdr, struct tso_t *tso,
net/core/tso.c:14:void tso_build_hdr(struct sk_buff *skb, char *hdr, struct tso_t *tso,
net/core/tso.c:37:EXPORT_SYMBOL(tso_build_hdr);


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